/* * MPEG-1/2 decoder * Copyright (c) 2000, 2001 Fabrice Bellard * Copyright (c) 2002-2013 Michael Niedermayer * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * MPEG-1/2 decoder */ #include "config_components.h" #define UNCHECKED_BITSTREAM_READER 1 #include #include "libavutil/attributes.h" #include "libavutil/emms.h" #include "libavutil/imgutils.h" #include "libavutil/internal.h" #include "libavutil/mem_internal.h" #include "libavutil/reverse.h" #include "libavutil/stereo3d.h" #include "libavutil/timecode.h" #include "avcodec.h" #include "codec_internal.h" #include "decode.h" #include "error_resilience.h" #include "hwaccel_internal.h" #include "hwconfig.h" #include "idctdsp.h" #include "internal.h" #include "mpeg_er.h" #include "mpeg12.h" #include "mpeg12codecs.h" #include "mpeg12data.h" #include "mpeg12dec.h" #include "mpegutils.h" #include "mpegvideo.h" #include "mpegvideodata.h" #include "mpegvideodec.h" #include "profiles.h" #include "startcode.h" #include "thread.h" #define A53_MAX_CC_COUNT 2000 enum Mpeg2ClosedCaptionsFormat { CC_FORMAT_AUTO, CC_FORMAT_A53_PART4, CC_FORMAT_SCTE20, CC_FORMAT_DVD }; typedef struct Mpeg1Context { MpegEncContext mpeg_enc_ctx; int repeat_field; /* true if we must repeat the field */ AVPanScan pan_scan; /* some temporary storage for the panscan */ AVStereo3D stereo3d; int has_stereo3d; AVBufferRef *a53_buf_ref; enum Mpeg2ClosedCaptionsFormat cc_format; uint8_t afd; int has_afd; int slice_count; unsigned aspect_ratio_info; AVRational save_aspect; int save_width, save_height, save_progressive_seq; AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */ unsigned frame_rate_index; int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */ int closed_gop; int tmpgexs; int first_slice; int extradata_decoded; int64_t timecode_frame_start; /*< GOP timecode frame start number, in non drop frame format */ } Mpeg1Context; #define MB_TYPE_ZERO_MV 0x20000000 static const uint32_t ptype2mb_type[7] = { MB_TYPE_INTRA, MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, MB_TYPE_L0, MB_TYPE_L0 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_INTRA, MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP, }; static const uint32_t btype2mb_type[11] = { MB_TYPE_INTRA, MB_TYPE_L1, MB_TYPE_L1 | MB_TYPE_CBP, MB_TYPE_L0, MB_TYPE_L0 | MB_TYPE_CBP, MB_TYPE_L0L1, MB_TYPE_L0L1 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_INTRA, MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP, }; /* as H.263, but only 17 codes */ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred) { int code, sign, val, shift; code = get_vlc2(&s->gb, ff_mv_vlc, MV_VLC_BITS, 2); if (code == 0) return pred; if (code < 0) return 0xffff; sign = get_bits1(&s->gb); shift = fcode - 1; val = code; if (shift) { val = (val - 1) << shift; val |= get_bits(&s->gb, shift); val++; } if (sign) val = -val; val += pred; /* modulo decoding */ return sign_extend(val, 5 + shift); } #define MAX_INDEX (64 - 1) #define check_scantable_index(ctx, x) \ do { \ if ((x) > MAX_INDEX) { \ av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \ ctx->mb_x, ctx->mb_y); \ return AVERROR_INVALIDDATA; \ } \ } while (0) static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n) { int level, i, j, run; const uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix = s->inter_matrix; const int qscale = s->qscale; { OPEN_READER(re, &s->gb); i = -1; // special case for first coefficient, no need to add second VLC table UPDATE_CACHE(re, &s->gb); if (((int32_t) GET_CACHE(re, &s->gb)) < 0) { level = (3 * qscale * quant_matrix[0]) >> 5; level = (level - 1) | 1; if (GET_CACHE(re, &s->gb) & 0x40000000) level = -level; block[0] = level; i++; SKIP_BITS(re, &s->gb, 2); if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) goto end; } /* now quantify & encode AC coefficients */ for (;;) { GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0); if (level != 0) { i += run; if (i > MAX_INDEX) break; j = scantable[i]; level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level - 1) | 1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); if (level == -128) { level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8); } else if (level == 0) { level = SHOW_UBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); } i += run; if (i > MAX_INDEX) break; j = scantable[i]; if (level < 0) { level = -level; level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level - 1) | 1; level = -level; } else { level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level - 1) | 1; } } block[j] = level; if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } check_scantable_index(s, i); s->block_last_index[n] = i; return 0; } static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n) { int level, i, j, run; const uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale = s->qscale; int mismatch; mismatch = 1; { OPEN_READER(re, &s->gb); i = -1; if (n < 4) quant_matrix = s->inter_matrix; else quant_matrix = s->chroma_inter_matrix; // Special case for first coefficient, no need to add second VLC table. UPDATE_CACHE(re, &s->gb); if (((int32_t) GET_CACHE(re, &s->gb)) < 0) { level = (3 * qscale * quant_matrix[0]) >> 5; if (GET_CACHE(re, &s->gb) & 0x40000000) level = -level; block[0] = level; mismatch ^= level; i++; SKIP_BITS(re, &s->gb, 2); if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) goto end; } /* now quantify & encode AC coefficients */ for (;;) { GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0); if (level != 0) { i += run; if (i > MAX_INDEX) break; j = scantable[i]; level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; if (i > MAX_INDEX) break; j = scantable[i]; if (level < 0) { level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = -level; } else { level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; } } mismatch ^= level; block[j] = level; if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } block[63] ^= (mismatch & 1); check_scantable_index(s, i); s->block_last_index[n] = i; return 0; } static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n) { int level, dc, diff, i, j, run; int component; const RL_VLC_ELEM *rl_vlc; const uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale = s->qscale; int mismatch; /* DC coefficient */ if (n < 4) { quant_matrix = s->intra_matrix; component = 0; } else { quant_matrix = s->chroma_intra_matrix; component = (n & 1) + 1; } diff = decode_dc(&s->gb, component); dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; block[0] = dc * (1 << (3 - s->intra_dc_precision)); ff_tlog(s->avctx, "dc=%d\n", block[0]); mismatch = block[0] ^ 1; i = 0; if (s->intra_vlc_format) rl_vlc = ff_mpeg2_rl_vlc; else rl_vlc = ff_mpeg1_rl_vlc; { OPEN_READER(re, &s->gb); /* now quantify & encode AC coefficients */ for (;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0); if (level == 127) { break; } else if (level != 0) { i += run; if (i > MAX_INDEX) break; j = scantable[i]; level = (level * qscale * quant_matrix[j]) >> 4; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; SKIP_BITS(re, &s->gb, 6); level = SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12); i += run; if (i > MAX_INDEX) break; j = scantable[i]; if (level < 0) { level = (-level * qscale * quant_matrix[j]) >> 4; level = -level; } else { level = (level * qscale * quant_matrix[j]) >> 4; } } mismatch ^= level; block[j] = level; } CLOSE_READER(re, &s->gb); } block[63] ^= mismatch & 1; check_scantable_index(s, i); s->block_last_index[n] = i; return 0; } /******************************************/ /* decoding */ static inline int get_dmv(MpegEncContext *s) { if (get_bits1(&s->gb)) return 1 - (get_bits1(&s->gb) << 1); else return 0; } /* motion type (for MPEG-2) */ #define MT_FIELD 1 #define MT_FRAME 2 #define MT_16X8 2 #define MT_DMV 3 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64]) { int i, j, k, cbp, val, mb_type, motion_type; const int mb_block_count = 4 + (1 << s->chroma_format); int ret; ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y); av_assert2(s->mb_skipped == 0); if (s->mb_skip_run-- != 0) { if (s->pict_type == AV_PICTURE_TYPE_P) { s->mb_skipped = 1; s->cur_pic.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16; } else { int mb_type; if (s->mb_x) mb_type = s->cur_pic.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1]; else // FIXME not sure if this is allowed in MPEG at all mb_type = s->cur_pic.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; if (IS_INTRA(mb_type)) { av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n"); return AVERROR_INVALIDDATA; } s->cur_pic.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type | MB_TYPE_SKIP; if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0) s->mb_skipped = 1; } return 0; } switch (s->pict_type) { default: case AV_PICTURE_TYPE_I: if (get_bits1(&s->gb) == 0) { if (get_bits1(&s->gb) == 0) { av_log(s->avctx, AV_LOG_ERROR, "Invalid mb type in I-frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA; } else { mb_type = MB_TYPE_INTRA; } break; case AV_PICTURE_TYPE_P: mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc, MB_PTYPE_VLC_BITS, 1); if (mb_type < 0) { av_log(s->avctx, AV_LOG_ERROR, "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } mb_type = ptype2mb_type[mb_type]; break; case AV_PICTURE_TYPE_B: mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 1); if (mb_type < 0) { av_log(s->avctx, AV_LOG_ERROR, "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } mb_type = btype2mb_type[mb_type]; break; } ff_tlog(s->avctx, "mb_type=%x\n", mb_type); // motion_type = 0; /* avoid warning */ if (IS_INTRA(mb_type)) { s->bdsp.clear_blocks(s->block[0]); if (!s->chroma_y_shift) s->bdsp.clear_blocks(s->block[6]); /* compute DCT type */ // FIXME: add an interlaced_dct coded var? if (s->picture_structure == PICT_FRAME && !s->frame_pred_frame_dct) s->interlaced_dct = get_bits1(&s->gb); if (IS_QUANT(mb_type)) s->qscale = mpeg_get_qscale(s); if (s->concealment_motion_vectors) { /* just parse them */ if (s->picture_structure != PICT_FRAME) skip_bits1(&s->gb); /* field select */ s->mv[0][0][0] = s->last_mv[0][0][0] = s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]); s->mv[0][0][1] = s->last_mv[0][0][1] = s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]); check_marker(s->avctx, &s->gb, "after concealment_motion_vectors"); } else { /* reset mv prediction */ memset(s->last_mv, 0, sizeof(s->last_mv)); } s->mb_intra = 1; if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) { for (i = 0; i < mb_block_count; i++) if ((ret = mpeg2_decode_block_intra(s, s->block[i], i)) < 0) return ret; } else { for (i = 0; i < 6; i++) { ret = ff_mpeg1_decode_block_intra(&s->gb, s->intra_matrix, s->intra_scantable.permutated, s->last_dc, s->block[i], i, s->qscale); if (ret < 0) { av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); return ret; } s->block_last_index[i] = ret; } } } else { if (mb_type & MB_TYPE_ZERO_MV) { av_assert2(mb_type & MB_TYPE_CBP); s->mv_dir = MV_DIR_FORWARD; if (s->picture_structure == PICT_FRAME) { if (s->picture_structure == PICT_FRAME && !s->frame_pred_frame_dct) s->interlaced_dct = get_bits1(&s->gb); s->mv_type = MV_TYPE_16X16; } else { s->mv_type = MV_TYPE_FIELD; mb_type |= MB_TYPE_INTERLACED; s->field_select[0][0] = s->picture_structure - 1; } if (IS_QUANT(mb_type)) s->qscale = mpeg_get_qscale(s); s->last_mv[0][0][0] = 0; s->last_mv[0][0][1] = 0; s->last_mv[0][1][0] = 0; s->last_mv[0][1][1] = 0; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; } else { av_assert2(mb_type & MB_TYPE_L0L1); // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED /* get additional motion vector type */ if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) { motion_type = MT_FRAME; } else { motion_type = get_bits(&s->gb, 2); if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type)) s->interlaced_dct = get_bits1(&s->gb); } if (IS_QUANT(mb_type)) s->qscale = mpeg_get_qscale(s); /* motion vectors */ s->mv_dir = (mb_type >> 13) & 3; ff_tlog(s->avctx, "motion_type=%d\n", motion_type); switch (motion_type) { case MT_FRAME: /* or MT_16X8 */ if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x16; s->mv_type = MV_TYPE_16X16; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { /* MT_FRAME */ s->mv[i][0][0] = s->last_mv[i][0][0] = s->last_mv[i][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]); s->mv[i][0][1] = s->last_mv[i][0][1] = s->last_mv[i][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]); /* full_pel: only for MPEG-1 */ if (s->full_pel[i]) { s->mv[i][0][0] *= 2; s->mv[i][0][1] *= 2; } } } } else { mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; s->mv_type = MV_TYPE_16X8; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { /* MT_16X8 */ for (j = 0; j < 2; j++) { s->field_select[i][j] = get_bits1(&s->gb); for (k = 0; k < 2; k++) { val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], s->last_mv[i][j][k]); s->last_mv[i][j][k] = val; s->mv[i][j][k] = val; } } } } } break; case MT_FIELD: s->mv_type = MV_TYPE_FIELD; if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { for (j = 0; j < 2; j++) { s->field_select[i][j] = get_bits1(&s->gb); val = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][j][0]); s->last_mv[i][j][0] = val; s->mv[i][j][0] = val; ff_tlog(s->avctx, "fmx=%d\n", val); val = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][j][1] >> 1); s->last_mv[i][j][1] = 2 * val; s->mv[i][j][1] = val; ff_tlog(s->avctx, "fmy=%d\n", val); } } } } else { av_assert0(!s->progressive_sequence); mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { s->field_select[i][0] = get_bits1(&s->gb); for (k = 0; k < 2; k++) { val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], s->last_mv[i][0][k]); s->last_mv[i][0][k] = val; s->last_mv[i][1][k] = val; s->mv[i][0][k] = val; } } } } break; case MT_DMV: if (s->progressive_sequence){ av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n"); return AVERROR_INVALIDDATA; } s->mv_type = MV_TYPE_DMV; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { int dmx, dmy, mx, my, m; const int my_shift = s->picture_structure == PICT_FRAME; mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]); s->last_mv[i][0][0] = mx; s->last_mv[i][1][0] = mx; dmx = get_dmv(s); my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1] >> my_shift); dmy = get_dmv(s); s->last_mv[i][0][1] = my * (1 << my_shift); s->last_mv[i][1][1] = my * (1 << my_shift); s->mv[i][0][0] = mx; s->mv[i][0][1] = my; s->mv[i][1][0] = mx; // not used s->mv[i][1][1] = my; // not used if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; // m = 1 + 2 * s->top_field_first; m = s->top_field_first ? 1 : 3; /* top -> top pred */ s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx; s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1; m = 4 - m; s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx; s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1; } else { mb_type |= MB_TYPE_16x16; s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx; s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy; if (s->picture_structure == PICT_TOP_FIELD) s->mv[i][2][1]--; else s->mv[i][2][1]++; } } } break; default: av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } } s->mb_intra = 0; if (HAS_CBP(mb_type)) { s->bdsp.clear_blocks(s->block[0]); cbp = get_vlc2(&s->gb, ff_mb_pat_vlc, MB_PAT_VLC_BITS, 1); if (mb_block_count > 6) { cbp *= 1 << mb_block_count - 6; cbp |= get_bits(&s->gb, mb_block_count - 6); s->bdsp.clear_blocks(s->block[6]); } if (cbp <= 0) { av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) { cbp <<= 12 - mb_block_count; for (i = 0; i < mb_block_count; i++) { if (cbp & (1 << 11)) { if ((ret = mpeg2_decode_block_non_intra(s, s->block[i], i)) < 0) return ret; } else { s->block_last_index[i] = -1; } cbp += cbp; } } else { for (i = 0; i < 6; i++) { if (cbp & 32) { if ((ret = mpeg1_decode_block_inter(s, s->block[i], i)) < 0) return ret; } else { s->block_last_index[i] = -1; } cbp += cbp; } } } else { for (i = 0; i < 12; i++) s->block_last_index[i] = -1; } } s->cur_pic.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type; return 0; } static av_cold int mpeg_decode_init(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; MpegEncContext *s2 = &s->mpeg_enc_ctx; int ret; s2->out_format = FMT_MPEG1; if ( avctx->codec_tag != AV_RL32("VCR2") && avctx->codec_tag != AV_RL32("BW10")) avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input ret = ff_mpv_decode_init(s2, avctx); if (ret < 0) return ret; ff_mpeg12_init_vlcs(); s2->chroma_format = 1; s->repeat_field = 0; avctx->color_range = AVCOL_RANGE_MPEG; return 0; } #if HAVE_THREADS static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from) { Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data; MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx; int err; if (avctx == avctx_from || !s1->context_initialized) return 0; err = ff_mpeg_update_thread_context(avctx, avctx_from); if (err) return err; if (!s->context_initialized) memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext)); return 0; } #endif static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = { #if CONFIG_MPEG1_NVDEC_HWACCEL AV_PIX_FMT_CUDA, #endif #if CONFIG_MPEG1_VDPAU_HWACCEL AV_PIX_FMT_VDPAU, #endif AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }; static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = { #if CONFIG_MPEG2_NVDEC_HWACCEL AV_PIX_FMT_CUDA, #endif #if CONFIG_MPEG2_VDPAU_HWACCEL AV_PIX_FMT_VDPAU, #endif #if CONFIG_MPEG2_DXVA2_HWACCEL AV_PIX_FMT_DXVA2_VLD, #endif #if CONFIG_MPEG2_D3D11VA_HWACCEL AV_PIX_FMT_D3D11VA_VLD, AV_PIX_FMT_D3D11, #endif #if CONFIG_MPEG2_D3D12VA_HWACCEL AV_PIX_FMT_D3D12, #endif #if CONFIG_MPEG2_VAAPI_HWACCEL AV_PIX_FMT_VAAPI, #endif #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL AV_PIX_FMT_VIDEOTOOLBOX, #endif AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }; static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = { AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE }; static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE }; static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; const enum AVPixelFormat *pix_fmts; if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) return AV_PIX_FMT_GRAY8; if (s->chroma_format < 2) pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ? mpeg1_hwaccel_pixfmt_list_420 : mpeg2_hwaccel_pixfmt_list_420; else if (s->chroma_format == 2) pix_fmts = mpeg12_pixfmt_list_422; else pix_fmts = mpeg12_pixfmt_list_444; return ff_get_format(avctx, pix_fmts); } /* Call this function when we know all parameters. * It may be called in different places for MPEG-1 and MPEG-2. */ static int mpeg_decode_postinit(AVCodecContext *avctx) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int ret; if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) { // MPEG-1 aspect AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s1->aspect_ratio_info], 255); avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num }; } else { // MPEG-2 // MPEG-2 aspect if (s1->aspect_ratio_info > 1) { AVRational dar = av_mul_q(av_div_q(ff_mpeg2_aspect[s1->aspect_ratio_info], (AVRational) { s1->pan_scan.width, s1->pan_scan.height }), (AVRational) { s->width, s->height }); /* We ignore the spec here and guess a bit as reality does not * match the spec, see for example res_change_ffmpeg_aspect.ts * and sequence-display-aspect.mpg. * issue1613, 621, 562 */ if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) || (av_cmp_q(dar, (AVRational) { 4, 3 }) && av_cmp_q(dar, (AVRational) { 16, 9 }))) { s->avctx->sample_aspect_ratio = av_div_q(ff_mpeg2_aspect[s1->aspect_ratio_info], (AVRational) { s->width, s->height }); } else { s->avctx->sample_aspect_ratio = av_div_q(ff_mpeg2_aspect[s1->aspect_ratio_info], (AVRational) { s1->pan_scan.width, s1->pan_scan.height }); // issue1613 4/3 16/9 -> 16/9 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3 // widescreen-issue562.mpg 4/3 16/9 -> 16/9 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height}); ff_dlog(avctx, "aspect A %d/%d\n", ff_mpeg2_aspect[s1->aspect_ratio_info].num, ff_mpeg2_aspect[s1->aspect_ratio_info].den); ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den); } } else { s->avctx->sample_aspect_ratio = ff_mpeg2_aspect[s1->aspect_ratio_info]; } } // MPEG-2 if (av_image_check_sar(s->width, s->height, avctx->sample_aspect_ratio) < 0) { av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n", avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den); avctx->sample_aspect_ratio = (AVRational){ 0, 1 }; } if (!s->context_initialized || avctx->coded_width != s->width || avctx->coded_height != s->height || s1->save_width != s->width || s1->save_height != s->height || av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) || (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) || 0) { if (s->context_initialized) ff_mpv_common_end(s); ret = ff_set_dimensions(avctx, s->width, s->height); if (ret < 0) return ret; if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate && (s->bit_rate != 0x3FFFF*400)) { avctx->rc_max_rate = s->bit_rate; } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate && (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) { avctx->bit_rate = s->bit_rate; } s1->save_aspect = s->avctx->sample_aspect_ratio; s1->save_width = s->width; s1->save_height = s->height; s1->save_progressive_seq = s->progressive_sequence; /* low_delay may be forced, in this case we will have B-frames * that behave like P-frames. */ avctx->has_b_frames = !s->low_delay; if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) { // MPEG-1 fps avctx->framerate = ff_mpeg12_frame_rate_tab[s1->frame_rate_index]; #if FF_API_TICKS_PER_FRAME FF_DISABLE_DEPRECATION_WARNINGS avctx->ticks_per_frame = 1; FF_ENABLE_DEPRECATION_WARNINGS #endif avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; } else { // MPEG-2 // MPEG-2 fps av_reduce(&s->avctx->framerate.num, &s->avctx->framerate.den, ff_mpeg12_frame_rate_tab[s1->frame_rate_index].num * s1->frame_rate_ext.num, ff_mpeg12_frame_rate_tab[s1->frame_rate_index].den * s1->frame_rate_ext.den, 1 << 30); #if FF_API_TICKS_PER_FRAME FF_DISABLE_DEPRECATION_WARNINGS avctx->ticks_per_frame = 2; FF_ENABLE_DEPRECATION_WARNINGS #endif switch (s->chroma_format) { case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break; case 2: case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break; default: av_assert0(0); } } // MPEG-2 avctx->pix_fmt = mpeg_get_pixelformat(avctx); if ((ret = ff_mpv_common_init(s)) < 0) return ret; } return 0; } static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int ref, f_code, vbv_delay, ret; ret = init_get_bits8(&s->gb, buf, buf_size); if (ret < 0) return ret; ref = get_bits(&s->gb, 10); /* temporal ref */ s->pict_type = get_bits(&s->gb, 3); if (s->pict_type == 0 || s->pict_type > 3) return AVERROR_INVALIDDATA; vbv_delay = get_bits(&s->gb, 16); s->vbv_delay = vbv_delay; if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) { s->full_pel[0] = get_bits1(&s->gb); f_code = get_bits(&s->gb, 3); if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) return AVERROR_INVALIDDATA; f_code += !f_code; s->mpeg_f_code[0][0] = f_code; s->mpeg_f_code[0][1] = f_code; } if (s->pict_type == AV_PICTURE_TYPE_B) { s->full_pel[1] = get_bits1(&s->gb); f_code = get_bits(&s->gb, 3); if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) return AVERROR_INVALIDDATA; f_code += !f_code; s->mpeg_f_code[1][0] = f_code; s->mpeg_f_code[1][1] = f_code; } if (avctx->debug & FF_DEBUG_PICT_INFO) av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type); s->y_dc_scale = 8; s->c_dc_scale = 8; return 0; } static void mpeg_decode_sequence_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; int horiz_size_ext, vert_size_ext; int bit_rate_ext; skip_bits(&s->gb, 1); /* profile and level esc*/ s->avctx->profile = get_bits(&s->gb, 3); s->avctx->level = get_bits(&s->gb, 4); s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */ s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */ if (!s->chroma_format) { s->chroma_format = 1; av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n"); } horiz_size_ext = get_bits(&s->gb, 2); vert_size_ext = get_bits(&s->gb, 2); s->width |= (horiz_size_ext << 12); s->height |= (vert_size_ext << 12); bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */ s->bit_rate += (bit_rate_ext << 18) * 400LL; check_marker(s->avctx, &s->gb, "after bit rate extension"); s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10; s->low_delay = get_bits1(&s->gb); if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY) s->low_delay = 1; s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1; s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1; ff_dlog(s->avctx, "sequence extension\n"); s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n", s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format, s->avctx->rc_buffer_size, s->bit_rate); } static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; int color_description, w, h; skip_bits(&s->gb, 3); /* video format */ color_description = get_bits1(&s->gb); if (color_description) { s->avctx->color_primaries = get_bits(&s->gb, 8); s->avctx->color_trc = get_bits(&s->gb, 8); s->avctx->colorspace = get_bits(&s->gb, 8); } w = get_bits(&s->gb, 14); skip_bits(&s->gb, 1); // marker h = get_bits(&s->gb, 14); // remaining 3 bits are zero padding s1->pan_scan.width = 16 * w; s1->pan_scan.height = 16 * h; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h); } static void mpeg_decode_picture_display_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; int i, nofco; nofco = 1; if (s->progressive_sequence) { if (s->repeat_first_field) { nofco++; if (s->top_field_first) nofco++; } } else { if (s->picture_structure == PICT_FRAME) { nofco++; if (s->repeat_first_field) nofco++; } } for (i = 0; i < nofco; i++) { s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16); skip_bits(&s->gb, 1); // marker s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16); skip_bits(&s->gb, 1); // marker } if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n", s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]); } static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra) { int i; for (i = 0; i < 64; i++) { int j = s->idsp.idct_permutation[ff_zigzag_direct[i]]; int v = get_bits(&s->gb, 8); if (v == 0) { av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n"); return AVERROR_INVALIDDATA; } if (intra && i == 0 && v != 8) { av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v); v = 8; // needed by pink.mpg / issue1046 } matrix0[j] = v; if (matrix1) matrix1[j] = v; } return 0; } static void mpeg_decode_quant_matrix_extension(MpegEncContext *s) { ff_dlog(s->avctx, "matrix extension\n"); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL, 1); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL, 0); } static int mpeg_decode_picture_coding_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; s->full_pel[0] = s->full_pel[1] = 0; s->mpeg_f_code[0][0] = get_bits(&s->gb, 4); s->mpeg_f_code[0][1] = get_bits(&s->gb, 4); s->mpeg_f_code[1][0] = get_bits(&s->gb, 4); s->mpeg_f_code[1][1] = get_bits(&s->gb, 4); s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0]; s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1]; s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0]; s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1]; if (!s->pict_type && s->context_initialized) { av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code\n"); if (s->avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; av_log(s->avctx, AV_LOG_WARNING, "Guessing pict_type from mpeg_f_code\n"); if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) { if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15) s->pict_type = AV_PICTURE_TYPE_I; else s->pict_type = AV_PICTURE_TYPE_P; } else s->pict_type = AV_PICTURE_TYPE_B; } s->intra_dc_precision = get_bits(&s->gb, 2); s->picture_structure = get_bits(&s->gb, 2); s->top_field_first = get_bits1(&s->gb); s->frame_pred_frame_dct = get_bits1(&s->gb); s->concealment_motion_vectors = get_bits1(&s->gb); s->q_scale_type = get_bits1(&s->gb); s->intra_vlc_format = get_bits1(&s->gb); s->alternate_scan = get_bits1(&s->gb); s->repeat_first_field = get_bits1(&s->gb); s->chroma_420_type = get_bits1(&s->gb); s->progressive_frame = get_bits1(&s->gb); // We only initialize intra_scantable, as both scantables always coincide // and all code therefore only uses the intra one. ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, s->alternate_scan ? ff_alternate_vertical_scan : ff_zigzag_direct); /* composite display not parsed */ ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision); ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure); ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first); ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field); ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors); ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format); ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan); ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct); ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame); return 0; } static int mpeg_field_start(Mpeg1Context *s1, const uint8_t *buf, int buf_size) { MpegEncContext *s = &s1->mpeg_enc_ctx; AVCodecContext *avctx = s->avctx; int second_field = 0; int ret; if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) { if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size) return AVERROR_INVALIDDATA; } /* start frame decoding */ if (s->first_field || s->picture_structure == PICT_FRAME) { AVFrameSideData *pan_scan; if ((ret = ff_mpv_frame_start(s, avctx)) < 0) return ret; if (s->picture_structure != PICT_FRAME) { s->cur_pic.ptr->f->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST * (s->picture_structure == PICT_TOP_FIELD); for (int i = 0; i < 3; i++) { if (s->picture_structure == PICT_BOTTOM_FIELD) { s->cur_pic.data[i] = FF_PTR_ADD(s->cur_pic.data[i], s->cur_pic.linesize[i]); } s->cur_pic.linesize[i] *= 2; s->last_pic.linesize[i] *= 2; s->next_pic.linesize[i] *= 2; } } ff_mpeg_er_frame_start(s); /* first check if we must repeat the frame */ s->cur_pic.ptr->f->repeat_pict = 0; if (s->repeat_first_field) { if (s->progressive_sequence) { if (s->top_field_first) s->cur_pic.ptr->f->repeat_pict = 4; else s->cur_pic.ptr->f->repeat_pict = 2; } else if (s->progressive_frame) { s->cur_pic.ptr->f->repeat_pict = 1; } } ret = ff_frame_new_side_data(s->avctx, s->cur_pic.ptr->f, AV_FRAME_DATA_PANSCAN, sizeof(s1->pan_scan), &pan_scan); if (ret < 0) return ret; if (pan_scan) memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan)); if (s1->a53_buf_ref) { ret = ff_frame_new_side_data_from_buf( s->avctx, s->cur_pic.ptr->f, AV_FRAME_DATA_A53_CC, &s1->a53_buf_ref, NULL); if (ret < 0) return ret; } if (s1->has_stereo3d) { AVStereo3D *stereo = av_stereo3d_create_side_data(s->cur_pic.ptr->f); if (!stereo) return AVERROR(ENOMEM); *stereo = s1->stereo3d; s1->has_stereo3d = 0; } if (s1->has_afd) { AVFrameSideData *sd; ret = ff_frame_new_side_data(s->avctx, s->cur_pic.ptr->f, AV_FRAME_DATA_AFD, 1, &sd); if (ret < 0) return ret; if (sd) *sd->data = s1->afd; s1->has_afd = 0; } if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME)) ff_thread_finish_setup(avctx); } else { // second field second_field = 1; if (!s->cur_pic.ptr) { av_log(s->avctx, AV_LOG_ERROR, "first field missing\n"); return AVERROR_INVALIDDATA; } if (s->avctx->hwaccel) { if ((ret = FF_HW_SIMPLE_CALL(s->avctx, end_frame)) < 0) { av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n"); return ret; } } ret = ff_mpv_alloc_dummy_frames(s); if (ret < 0) return ret; for (int i = 0; i < 3; i++) { s->cur_pic.data[i] = s->cur_pic.ptr->f->data[i]; if (s->picture_structure == PICT_BOTTOM_FIELD) s->cur_pic.data[i] += s->cur_pic.ptr->f->linesize[i]; } } if (avctx->hwaccel) { if ((ret = FF_HW_CALL(avctx, start_frame, buf, buf_size)) < 0) return ret; } else if (s->codec_tag == MKTAG('V', 'C', 'R', '2')) { // Exchange UV FFSWAP(uint8_t*, s->cur_pic.data[1], s->cur_pic.data[2]); FFSWAP(ptrdiff_t, s->cur_pic.linesize[1], s->cur_pic.linesize[2]); if (!second_field) { FFSWAP(uint8_t*, s->next_pic.data[1], s->next_pic.data[2]); FFSWAP(ptrdiff_t, s->next_pic.linesize[1], s->next_pic.linesize[2]); FFSWAP(uint8_t*, s->last_pic.data[1], s->last_pic.data[2]); FFSWAP(ptrdiff_t, s->last_pic.linesize[1], s->last_pic.linesize[2]); } } return 0; } #define DECODE_SLICE_ERROR -1 #define DECODE_SLICE_OK 0 /** * Decode a slice. * MpegEncContext.mb_y must be set to the MB row from the startcode. * @return DECODE_SLICE_ERROR if the slice is damaged, * DECODE_SLICE_OK if this slice is OK */ static int mpeg_decode_slice(MpegEncContext *s, int mb_y, const uint8_t **buf, int buf_size) { AVCodecContext *avctx = s->avctx; const int lowres = s->avctx->lowres; const int field_pic = s->picture_structure != PICT_FRAME; int ret; s->resync_mb_x = s->resync_mb_y = -1; av_assert0(mb_y < s->mb_height); ret = init_get_bits8(&s->gb, *buf, buf_size); if (ret < 0) return ret; if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16) skip_bits(&s->gb, 3); ff_mpeg1_clean_buffers(s); s->interlaced_dct = 0; s->qscale = mpeg_get_qscale(s); if (s->qscale == 0) { av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n"); return AVERROR_INVALIDDATA; } /* extra slice info */ if (skip_1stop_8data_bits(&s->gb) < 0) return AVERROR_INVALIDDATA; s->mb_x = 0; if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) { skip_bits1(&s->gb); } else { while (get_bits_left(&s->gb) > 0) { int code = get_vlc2(&s->gb, ff_mbincr_vlc, MBINCR_VLC_BITS, 2); if (code < 0) { av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n"); return AVERROR_INVALIDDATA; } if (code >= 33) { if (code == 33) s->mb_x += 33; /* otherwise, stuffing, nothing to do */ } else { s->mb_x += code; break; } } } if (s->mb_x >= (unsigned) s->mb_width) { av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n"); return AVERROR_INVALIDDATA; } if (avctx->hwaccel) { const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */ int start_code = -1; buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code); if (buf_end < *buf + buf_size) buf_end -= 4; s->mb_y = mb_y; if (FF_HW_CALL(avctx, decode_slice, buf_start, buf_end - buf_start) < 0) return DECODE_SLICE_ERROR; *buf = buf_end; return DECODE_SLICE_OK; } s->resync_mb_x = s->mb_x; s->resync_mb_y = s->mb_y = mb_y; s->mb_skip_run = 0; ff_init_block_index(s); if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) { if (s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %c %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n", s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1], s->pict_type == AV_PICTURE_TYPE_I ? 'I' : (s->pict_type == AV_PICTURE_TYPE_P ? 'P' : (s->pict_type == AV_PICTURE_TYPE_B ? 'B' : 'S')), s->progressive_sequence ? "ps" : "", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" : "", s->top_field_first ? "top" : "", s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors, s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" : ""); } } for (;;) { if ((ret = mpeg_decode_mb(s, s->block)) < 0) return ret; // Note motion_val is normally NULL unless we want to extract the MVs. if (s->cur_pic.motion_val[0]) { const int wrap = s->b8_stride; int xy = s->mb_x * 2 + s->mb_y * 2 * wrap; int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride); int motion_x, motion_y, dir, i; for (i = 0; i < 2; i++) { for (dir = 0; dir < 2; dir++) { if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) { motion_x = motion_y = 0; } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) { motion_x = s->mv[dir][0][0]; motion_y = s->mv[dir][0][1]; } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */ motion_x = s->mv[dir][i][0]; motion_y = s->mv[dir][i][1]; } s->cur_pic.motion_val[dir][xy][0] = motion_x; s->cur_pic.motion_val[dir][xy][1] = motion_y; s->cur_pic.motion_val[dir][xy + 1][0] = motion_x; s->cur_pic.motion_val[dir][xy + 1][1] = motion_y; s->cur_pic.ref_index [dir][b8_xy] = s->cur_pic.ref_index [dir][b8_xy + 1] = s->field_select[dir][i]; av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1); } xy += wrap; b8_xy += 2; } } s->dest[0] += 16 >> lowres; s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift; s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift; ff_mpv_reconstruct_mb(s, s->block); if (++s->mb_x >= s->mb_width) { const int mb_size = 16 >> s->avctx->lowres; int left; ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size); ff_mpv_report_decode_progress(s); s->mb_x = 0; s->mb_y += 1 << field_pic; if (s->mb_y >= s->mb_height) { int left = get_bits_left(&s->gb); int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10 */; if (left >= 32 && !is_d10) { GetBitContext gb = s->gb; align_get_bits(&gb); if (show_bits(&gb, 24) == 0x060E2B) { av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n"); is_d10 = 1; } if (left > 32 && show_bits_long(&gb, 32) == 0x201) { av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n"); goto eos; } } if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) { av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n", left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } else goto eos; } // There are some files out there which are missing the last slice // in cases where the slice is completely outside the visible // area, we detect this here instead of running into the end expecting // more data left = get_bits_left(&s->gb); if (s->mb_y >= ((s->height + 15) >> 4) && !s->progressive_sequence && left <= 25 && left >= 0 && s->mb_skip_run == -1 && (!left || show_bits(&s->gb, left) == 0)) goto eos; ff_init_block_index(s); } /* skip mb handling */ if (s->mb_skip_run == -1) { /* read increment again */ s->mb_skip_run = 0; for (;;) { int code = get_vlc2(&s->gb, ff_mbincr_vlc, MBINCR_VLC_BITS, 2); if (code < 0) { av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n"); return AVERROR_INVALIDDATA; } if (code >= 33) { if (code == 33) { s->mb_skip_run += 33; } else if (code == 35) { if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) { av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n"); return AVERROR_INVALIDDATA; } goto eos; /* end of slice */ } /* otherwise, stuffing, nothing to do */ } else { s->mb_skip_run += code; break; } } if (s->mb_skip_run) { int i; if (s->pict_type == AV_PICTURE_TYPE_I) { av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } /* skip mb */ s->mb_intra = 0; for (i = 0; i < 12; i++) s->block_last_index[i] = -1; if (s->picture_structure == PICT_FRAME) s->mv_type = MV_TYPE_16X16; else s->mv_type = MV_TYPE_FIELD; if (s->pict_type == AV_PICTURE_TYPE_P) { /* if P type, zero motion vector is implied */ s->mv_dir = MV_DIR_FORWARD; s->mv[0][0][0] = s->mv[0][0][1] = 0; s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0; s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0; s->field_select[0][0] = (s->picture_structure - 1) & 1; } else { /* if B type, reuse previous vectors and directions */ s->mv[0][0][0] = s->last_mv[0][0][0]; s->mv[0][0][1] = s->last_mv[0][0][1]; s->mv[1][0][0] = s->last_mv[1][0][0]; s->mv[1][0][1] = s->last_mv[1][0][1]; s->field_select[0][0] = (s->picture_structure - 1) & 1; s->field_select[1][0] = (s->picture_structure - 1) & 1; } } } } eos: // end of slice if (get_bits_left(&s->gb) < 0) { av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb)); return AVERROR_INVALIDDATA; } *buf += (get_bits_count(&s->gb) - 1) / 8; ff_dlog(s, "Slice start:%d %d end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y); return 0; } static int slice_decode_thread(AVCodecContext *c, void *arg) { MpegEncContext *s = *(void **) arg; const uint8_t *buf = s->gb.buffer; int mb_y = s->start_mb_y; const int field_pic = s->picture_structure != PICT_FRAME; s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic; for (;;) { uint32_t start_code; int ret; ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf); emms_c(); ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->er.error_count); if (ret < 0) { if (c->err_recognition & AV_EF_EXPLODE) return ret; if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0) ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR); } else { ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END); } if (s->mb_y == s->end_mb_y) return 0; start_code = -1; buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code); if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE) return AVERROR_INVALIDDATA; mb_y = start_code - SLICE_MIN_START_CODE; if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16) mb_y += (*buf&0xE0)<<2; mb_y <<= field_pic; if (s->picture_structure == PICT_BOTTOM_FIELD) mb_y++; if (mb_y >= s->end_mb_y) return AVERROR_INVALIDDATA; } } /** * Handle slice ends. * @return 1 if it seems to be the last slice */ static int slice_end(AVCodecContext *avctx, AVFrame *pict, int *got_output) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; if (!s->context_initialized || !s->cur_pic.ptr) return 0; if (s->avctx->hwaccel) { int ret = FF_HW_SIMPLE_CALL(s->avctx, end_frame); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n"); return ret; } } /* end of slice reached */ if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) { /* end of image */ ff_er_frame_end(&s->er, NULL); ff_mpv_frame_end(s); if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { int ret = av_frame_ref(pict, s->cur_pic.ptr->f); if (ret < 0) return ret; ff_print_debug_info(s, s->cur_pic.ptr, pict); ff_mpv_export_qp_table(s, pict, s->cur_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG2); *got_output = 1; } else { /* latency of 1 frame for I- and P-frames */ if (s->last_pic.ptr && !s->last_pic.ptr->dummy) { int ret = av_frame_ref(pict, s->last_pic.ptr->f); if (ret < 0) return ret; ff_print_debug_info(s, s->last_pic.ptr, pict); ff_mpv_export_qp_table(s, pict, s->last_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG2); *got_output = 1; } } return 1; } else { return 0; } } static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int width, height; int i, v, j; int ret = init_get_bits8(&s->gb, buf, buf_size); if (ret < 0) return ret; width = get_bits(&s->gb, 12); height = get_bits(&s->gb, 12); if (width == 0 || height == 0) { av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size value.\n"); if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT)) return AVERROR_INVALIDDATA; } s1->aspect_ratio_info = get_bits(&s->gb, 4); if (s1->aspect_ratio_info == 0) { av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n"); if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT)) return AVERROR_INVALIDDATA; } s1->frame_rate_index = get_bits(&s->gb, 4); if (s1->frame_rate_index == 0 || s1->frame_rate_index > 13) { av_log(avctx, AV_LOG_WARNING, "frame_rate_index %d is invalid\n", s1->frame_rate_index); s1->frame_rate_index = 1; } s->bit_rate = get_bits(&s->gb, 18) * 400LL; if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) { return AVERROR_INVALIDDATA; } s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16; skip_bits(&s->gb, 1); /* get matrix */ if (get_bits1(&s->gb)) { load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1); } else { for (i = 0; i < 64; i++) { j = s->idsp.idct_permutation[i]; v = ff_mpeg1_default_intra_matrix[i]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; } } if (get_bits1(&s->gb)) { load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0); } else { for (i = 0; i < 64; i++) { int j = s->idsp.idct_permutation[i]; v = ff_mpeg1_default_non_intra_matrix[i]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } } if (show_bits(&s->gb, 23) != 0) { av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n"); return AVERROR_INVALIDDATA; } s->width = width; s->height = height; /* We set MPEG-2 parameters so that it emulates MPEG-1. */ s->progressive_sequence = 1; s->progressive_frame = 1; s->picture_structure = PICT_FRAME; s->first_field = 0; s->frame_pred_frame_dct = 1; s->chroma_format = 1; s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO; if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY) s->low_delay = 1; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n", s->avctx->rc_buffer_size, s->bit_rate, s1->aspect_ratio_info); return 0; } static int vcr2_init_sequence(AVCodecContext *avctx) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int i, v, ret; /* start new MPEG-1 context decoding */ if (s->context_initialized) ff_mpv_common_end(s); s->width = avctx->coded_width; s->height = avctx->coded_height; avctx->has_b_frames = 0; // true? s->low_delay = 1; avctx->pix_fmt = mpeg_get_pixelformat(avctx); if ((ret = ff_mpv_common_init(s)) < 0) return ret; for (i = 0; i < 64; i++) { int j = s->idsp.idct_permutation[i]; v = ff_mpeg1_default_intra_matrix[i]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; v = ff_mpeg1_default_non_intra_matrix[i]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } s->progressive_sequence = 1; s->progressive_frame = 1; s->picture_structure = PICT_FRAME; s->first_field = 0; s->frame_pred_frame_dct = 1; s->chroma_format = 1; if (s->codec_tag == AV_RL32("BW10")) { s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO; } else { s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO; } s1->save_width = s->width; s1->save_height = s->height; s1->save_progressive_seq = s->progressive_sequence; return 0; } static void mpeg_set_cc_format(AVCodecContext *avctx, enum Mpeg2ClosedCaptionsFormat format, const char *label) { Mpeg1Context *s1 = avctx->priv_data; av_assert2(format != CC_FORMAT_AUTO); if (!s1->cc_format) { s1->cc_format = format; av_log(avctx, AV_LOG_DEBUG, "CC: first seen substream is %s format\n", label); } } static int mpeg_decode_a53_cc(AVCodecContext *avctx, const uint8_t *p, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; if ((!s1->cc_format || s1->cc_format == CC_FORMAT_A53_PART4) && buf_size >= 6 && p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' && p[4] == 3 && (p[5] & 0x40)) { /* extract A53 Part 4 CC data */ int cc_count = p[5] & 0x1f; if (cc_count > 0 && buf_size >= 7 + cc_count * 3) { int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0; const uint64_t new_size = (old_size + cc_count * UINT64_C(3)); int ret; if (new_size > 3*A53_MAX_CC_COUNT) return AVERROR(EINVAL); ret = av_buffer_realloc(&s1->a53_buf_ref, new_size); if (ret >= 0) memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3)); avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS; mpeg_set_cc_format(avctx, CC_FORMAT_A53_PART4, "A/53 Part 4"); } return 1; } else if ((!s1->cc_format || s1->cc_format == CC_FORMAT_SCTE20) && buf_size >= 2 && p[0] == 0x03 && (p[1]&0x7f) == 0x01) { /* extract SCTE-20 CC data */ GetBitContext gb; int cc_count = 0; int i, ret; ret = init_get_bits8(&gb, p + 2, buf_size - 2); if (ret < 0) return ret; cc_count = get_bits(&gb, 5); if (cc_count > 0) { int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0; const uint64_t new_size = (old_size + cc_count * UINT64_C(3)); if (new_size > 3*A53_MAX_CC_COUNT) return AVERROR(EINVAL); ret = av_buffer_realloc(&s1->a53_buf_ref, new_size); if (ret >= 0) { uint8_t field, cc1, cc2; uint8_t *cap = s1->a53_buf_ref->data; memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3); for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) { skip_bits(&gb, 2); // priority field = get_bits(&gb, 2); skip_bits(&gb, 5); // line_offset cc1 = get_bits(&gb, 8); cc2 = get_bits(&gb, 8); skip_bits(&gb, 1); // marker if (!field) { // forbidden cap[0] = cap[1] = cap[2] = 0x00; } else { field = (field == 2 ? 1 : 0); if (!s1->mpeg_enc_ctx.top_field_first) field = !field; cap[0] = 0x04 | field; cap[1] = ff_reverse[cc1]; cap[2] = ff_reverse[cc2]; } cap += 3; } } avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS; mpeg_set_cc_format(avctx, CC_FORMAT_SCTE20, "SCTE-20"); } return 1; } else if ((!s1->cc_format || s1->cc_format == CC_FORMAT_DVD) && buf_size >= 11 && p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) { /* extract DVD CC data * * uint32_t user_data_start_code 0x000001B2 (big endian) * uint16_t user_identifier 0x4343 "CC" * uint8_t user_data_type_code 0x01 * uint8_t caption_block_size 0xF8 * uint8_t * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first * bit 6 caption_filler 0 * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP. * bit 0 caption_extra_field_added 1=one additional caption word * * struct caption_field_block { * uint8_t * bit 7:1 caption_filler 0x7F (all 1s) * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4) * uint8_t caption_first_byte * uint8_t caption_second_byte * } caption_block[(caption_block_count * 2) + caption_extra_field_added]; * * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields. * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start * on the even field. There also exist DVDs in the wild that encode an odd field count and the * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */ int cc_count = 0; int i, ret; // There is a caption count field in the data, but it is often // incorrect. So count the number of captions present. for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6) cc_count++; // Transform the DVD format into A53 Part 4 format if (cc_count > 0) { int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0; const uint64_t new_size = (old_size + cc_count * UINT64_C(6)); if (new_size > 3*A53_MAX_CC_COUNT) return AVERROR(EINVAL); ret = av_buffer_realloc(&s1->a53_buf_ref, new_size); if (ret >= 0) { uint8_t field1 = !!(p[4] & 0x80); uint8_t *cap = s1->a53_buf_ref->data; p += 5; for (i = 0; i < cc_count; i++) { cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd; cap[1] = p[1]; cap[2] = p[2]; cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd; cap[4] = p[4]; cap[5] = p[5]; cap += 6; p += 6; } } avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS; mpeg_set_cc_format(avctx, CC_FORMAT_DVD, "DVD"); } return 1; } return 0; } static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *p, int buf_size) { Mpeg1Context *s = avctx->priv_data; const uint8_t *buf_end = p + buf_size; Mpeg1Context *s1 = avctx->priv_data; #if 0 int i; for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i 29){ int i; for(i=0; i<20; i++) if (!memcmp(p+i, "\0TMPGEXS\0", 9)){ s->tmpgexs= 1; } } /* we parse the DTG active format information */ if (buf_end - p >= 5 && p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') { int flags = p[4]; p += 5; if (flags & 0x80) { /* skip event id */ p += 2; } if (flags & 0x40) { if (buf_end - p < 1) return; s1->has_afd = 1; s1->afd = p[0] & 0x0f; } } else if (buf_end - p >= 6 && p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' && p[4] == 0x03) { // S3D_video_format_length // the 0x7F mask ignores the reserved_bit value const uint8_t S3D_video_format_type = p[5] & 0x7F; if (S3D_video_format_type == 0x03 || S3D_video_format_type == 0x04 || S3D_video_format_type == 0x08 || S3D_video_format_type == 0x23) { s1->has_stereo3d = 1; switch (S3D_video_format_type) { case 0x03: s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE; break; case 0x04: s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM; break; case 0x08: s1->stereo3d.type = AV_STEREO3D_2D; break; case 0x23: s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX; break; } } } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) { return; } } static int mpeg_decode_gop(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int broken_link; int64_t tc; int ret = init_get_bits8(&s->gb, buf, buf_size); if (ret < 0) return ret; tc = s1->timecode_frame_start = get_bits(&s->gb, 25); s1->closed_gop = get_bits1(&s->gb); /* broken_link indicates that after editing the * reference frames of the first B-Frames after GOP I-Frame * are missing (open gop) */ broken_link = get_bits1(&s->gb); if (s->avctx->debug & FF_DEBUG_PICT_INFO) { char tcbuf[AV_TIMECODE_STR_SIZE]; av_timecode_make_mpeg_tc_string(tcbuf, tc); av_log(s->avctx, AV_LOG_DEBUG, "GOP (%s) closed_gop=%d broken_link=%d\n", tcbuf, s1->closed_gop, broken_link); } return 0; } static int decode_chunks(AVCodecContext *avctx, AVFrame *picture, int *got_output, const uint8_t *buf, int buf_size) { Mpeg1Context *s = avctx->priv_data; MpegEncContext *s2 = &s->mpeg_enc_ctx; const uint8_t *buf_ptr = buf; const uint8_t *buf_end = buf + buf_size; int ret, input_size; int last_code = 0, skip_frame = 0; int picture_start_code_seen = 0; for (;;) { /* find next start code */ uint32_t start_code = -1; buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code); if (start_code > 0x1ff) { if (!skip_frame) { if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && !avctx->hwaccel) { int i; av_assert0(avctx->thread_count > 1); avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void *)); for (i = 0; i < s->slice_count; i++) s2->er.error_count += s2->thread_context[i]->er.error_count; } ret = slice_end(avctx, picture, got_output); if (ret < 0) return ret; } s2->pict_type = 0; if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count) return AVERROR_INVALIDDATA; return FFMAX(0, buf_ptr - buf); } input_size = buf_end - buf_ptr; if (avctx->debug & FF_DEBUG_STARTCODE) av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n", start_code, buf_ptr - buf, input_size); /* prepare data for next start code */ switch (start_code) { case SEQ_START_CODE: if (last_code == 0) { mpeg1_decode_sequence(avctx, buf_ptr, input_size); if (buf != avctx->extradata) s->sync = 1; } else { av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; case PICTURE_START_CODE: if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) { /* If it's a frame picture, there can't be more than one picture header. Yet, it does happen and we need to handle it. */ av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n"); break; } picture_start_code_seen = 1; if (buf == avctx->extradata && avctx->codec_tag == AV_RL32("AVmp")) { av_log(avctx, AV_LOG_WARNING, "ignoring picture start code in AVmp extradata\n"); break; } if (s2->width <= 0 || s2->height <= 0) { av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n", s2->width, s2->height); return AVERROR_INVALIDDATA; } if (s->tmpgexs){ s2->intra_dc_precision= 3; s2->intra_matrix[0]= 1; } if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && !avctx->hwaccel && s->slice_count) { int i; avctx->execute(avctx, slice_decode_thread, s2->thread_context, NULL, s->slice_count, sizeof(void *)); for (i = 0; i < s->slice_count; i++) s2->er.error_count += s2->thread_context[i]->er.error_count; s->slice_count = 0; } if (last_code == 0 || last_code == SLICE_MIN_START_CODE) { ret = mpeg_decode_postinit(avctx); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n"); return ret; } /* We have a complete image: we try to decompress it. */ if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0) s2->pict_type = 0; s->first_slice = 1; last_code = PICTURE_START_CODE; } else { av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; case EXT_START_CODE: ret = init_get_bits8(&s2->gb, buf_ptr, input_size); if (ret < 0) return ret; switch (get_bits(&s2->gb, 4)) { case 0x1: if (last_code == 0) { mpeg_decode_sequence_extension(s); } else { av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; case 0x2: mpeg_decode_sequence_display_extension(s); break; case 0x3: mpeg_decode_quant_matrix_extension(s2); break; case 0x7: mpeg_decode_picture_display_extension(s); break; case 0x8: if (last_code == PICTURE_START_CODE) { int ret = mpeg_decode_picture_coding_extension(s); if (ret < 0) return ret; } else { av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; } break; case USER_START_CODE: mpeg_decode_user_data(avctx, buf_ptr, input_size); break; case GOP_START_CODE: if (last_code == 0) { s2->first_field = 0; ret = mpeg_decode_gop(avctx, buf_ptr, input_size); if (ret < 0) return ret; s->sync = 1; } else { av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; default: if (start_code >= SLICE_MIN_START_CODE && start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) { if (s2->progressive_sequence && !s2->progressive_frame) { s2->progressive_frame = 1; av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n"); } if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) { av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure); s2->picture_structure = PICT_FRAME; } if (s2->progressive_sequence && !s2->frame_pred_frame_dct) av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n"); if (s2->picture_structure == PICT_FRAME) { s2->first_field = 0; s2->v_edge_pos = 16 * s2->mb_height; } else { s2->first_field ^= 1; s2->v_edge_pos = 8 * s2->mb_height; memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height); } } if (start_code >= SLICE_MIN_START_CODE && start_code <= SLICE_MAX_START_CODE && last_code != 0) { const int field_pic = s2->picture_structure != PICT_FRAME; int mb_y = start_code - SLICE_MIN_START_CODE; last_code = SLICE_MIN_START_CODE; if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16) mb_y += (*buf_ptr&0xE0)<<2; mb_y <<= field_pic; if (s2->picture_structure == PICT_BOTTOM_FIELD) mb_y++; if (buf_end - buf_ptr < 2) { av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n"); return AVERROR_INVALIDDATA; } if (mb_y >= s2->mb_height) { av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height); return AVERROR_INVALIDDATA; } if (!s2->last_pic.ptr) { /* Skip B-frames if we do not have reference frames and * GOP is not closed. */ if (s2->pict_type == AV_PICTURE_TYPE_B) { if (!s->closed_gop) { skip_frame = 1; av_log(s2->avctx, AV_LOG_DEBUG, "Skipping B slice due to open GOP\n"); break; } } } if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL)) s->sync = 1; if (!s2->next_pic.ptr) { /* Skip P-frames if we do not have a reference frame or * we have an invalid header. */ if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) { skip_frame = 1; av_log(s2->avctx, AV_LOG_DEBUG, "Skipping P slice due to !sync\n"); break; } } if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) || (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) || avctx->skip_frame >= AVDISCARD_ALL) { skip_frame = 1; break; } if (!s2->context_initialized) break; if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) { if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom) break; } if (!s2->pict_type) { av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n"); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; break; } if (s->first_slice) { skip_frame = 0; s->first_slice = 0; if ((ret = mpeg_field_start(s, buf, buf_size)) < 0) return ret; } if (!s2->cur_pic.ptr) { av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n"); return AVERROR_INVALIDDATA; } if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && !avctx->hwaccel) { int threshold = (s2->mb_height * s->slice_count + s2->slice_context_count / 2) / s2->slice_context_count; av_assert0(avctx->thread_count > 1); if (threshold <= mb_y) { MpegEncContext *thread_context = s2->thread_context[s->slice_count]; thread_context->start_mb_y = mb_y; thread_context->end_mb_y = s2->mb_height; if (s->slice_count) { s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y; ret = ff_update_duplicate_context(thread_context, s2); if (ret < 0) return ret; } ret = init_get_bits8(&thread_context->gb, buf_ptr, input_size); if (ret < 0) return ret; s->slice_count++; } buf_ptr += 2; // FIXME add minimum number of bytes per slice } else { ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size); emms_c(); if (ret < 0) { if (avctx->err_recognition & AV_EF_EXPLODE) return ret; if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0) ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR); } else { ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x - 1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END); } } } break; } } } static int mpeg_decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_output, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int ret; int buf_size = avpkt->size; Mpeg1Context *s = avctx->priv_data; MpegEncContext *s2 = &s->mpeg_enc_ctx; if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) { /* special case for last picture */ if (s2->low_delay == 0 && s2->next_pic.ptr) { int ret = av_frame_ref(picture, s2->next_pic.ptr->f); if (ret < 0) return ret; ff_mpv_unref_picture(&s2->next_pic); *got_output = 1; } return buf_size; } if (!s2->context_initialized && (s2->codec_tag == AV_RL32("VCR2") || s2->codec_tag == AV_RL32("BW10"))) vcr2_init_sequence(avctx); s->slice_count = 0; if (avctx->extradata && !s->extradata_decoded) { ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size); if (*got_output) { av_log(avctx, AV_LOG_ERROR, "picture in extradata\n"); av_frame_unref(picture); *got_output = 0; } s->extradata_decoded = 1; if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) { ff_mpv_unref_picture(&s2->cur_pic); return ret; } } ret = decode_chunks(avctx, picture, got_output, buf, buf_size); if (ret<0 || *got_output) { ff_mpv_unref_picture(&s2->cur_pic); if (s->timecode_frame_start != -1 && *got_output) { char tcbuf[AV_TIMECODE_STR_SIZE]; AVFrameSideData *tcside = av_frame_new_side_data(picture, AV_FRAME_DATA_GOP_TIMECODE, sizeof(int64_t)); if (!tcside) return AVERROR(ENOMEM); memcpy(tcside->data, &s->timecode_frame_start, sizeof(int64_t)); av_timecode_make_mpeg_tc_string(tcbuf, s->timecode_frame_start); av_dict_set(&picture->metadata, "timecode", tcbuf, 0); s->timecode_frame_start = -1; } } return ret; } static void flush(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; s->sync = 0; s->closed_gop = 0; av_buffer_unref(&s->a53_buf_ref); ff_mpeg_flush(avctx); } static av_cold int mpeg_decode_end(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; av_buffer_unref(&s->a53_buf_ref); return ff_mpv_decode_close(avctx); } const FFCodec ff_mpeg1video_decoder = { .p.name = "mpeg1video", CODEC_LONG_NAME("MPEG-1 video"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_MPEG1VIDEO, .priv_data_size = sizeof(Mpeg1Context), .init = mpeg_decode_init, .close = mpeg_decode_end, FF_CODEC_DECODE_CB(mpeg_decode_frame), .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS, .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, .flush = flush, .p.max_lowres = 3, UPDATE_THREAD_CONTEXT(mpeg_decode_update_thread_context), .hw_configs = (const AVCodecHWConfigInternal *const []) { #if CONFIG_MPEG1_NVDEC_HWACCEL HWACCEL_NVDEC(mpeg1), #endif #if CONFIG_MPEG1_VDPAU_HWACCEL HWACCEL_VDPAU(mpeg1), #endif #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL HWACCEL_VIDEOTOOLBOX(mpeg1), #endif NULL }, }; #define M2V_OFFSET(x) offsetof(Mpeg1Context, x) #define M2V_PARAM AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM static const AVOption mpeg2video_options[] = { { "cc_format", "extract a specific Closed Captions format", M2V_OFFSET(cc_format), AV_OPT_TYPE_INT, { .i64 = CC_FORMAT_AUTO }, CC_FORMAT_AUTO, CC_FORMAT_DVD, M2V_PARAM, .unit = "cc_format" }, { "auto", "pick first seen CC substream", 0, AV_OPT_TYPE_CONST, { .i64 = CC_FORMAT_AUTO }, .flags = M2V_PARAM, .unit = "cc_format" }, { "a53", "pick A/53 Part 4 CC substream", 0, AV_OPT_TYPE_CONST, { .i64 = CC_FORMAT_A53_PART4 }, .flags = M2V_PARAM, .unit = "cc_format" }, { "scte20", "pick SCTE-20 CC substream", 0, AV_OPT_TYPE_CONST, { .i64 = CC_FORMAT_SCTE20 }, .flags = M2V_PARAM, .unit = "cc_format" }, { "dvd", "pick DVD CC substream", 0, AV_OPT_TYPE_CONST, { .i64 = CC_FORMAT_DVD }, .flags = M2V_PARAM, .unit = "cc_format" }, { NULL } }; static const AVClass mpeg2video_class = { .class_name = "MPEG-2 video", .item_name = av_default_item_name, .option = mpeg2video_options, .version = LIBAVUTIL_VERSION_INT, .category = AV_CLASS_CATEGORY_DECODER, }; const FFCodec ff_mpeg2video_decoder = { .p.name = "mpeg2video", CODEC_LONG_NAME("MPEG-2 video"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_MPEG2VIDEO, .p.priv_class = &mpeg2video_class, .priv_data_size = sizeof(Mpeg1Context), .init = mpeg_decode_init, .close = mpeg_decode_end, FF_CODEC_DECODE_CB(mpeg_decode_frame), .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS, .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, .flush = flush, .p.max_lowres = 3, .p.profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles), .hw_configs = (const AVCodecHWConfigInternal *const []) { #if CONFIG_MPEG2_DXVA2_HWACCEL HWACCEL_DXVA2(mpeg2), #endif #if CONFIG_MPEG2_D3D11VA_HWACCEL HWACCEL_D3D11VA(mpeg2), #endif #if CONFIG_MPEG2_D3D11VA2_HWACCEL HWACCEL_D3D11VA2(mpeg2), #endif #if CONFIG_MPEG2_D3D12VA_HWACCEL HWACCEL_D3D12VA(mpeg2), #endif #if CONFIG_MPEG2_NVDEC_HWACCEL HWACCEL_NVDEC(mpeg2), #endif #if CONFIG_MPEG2_VAAPI_HWACCEL HWACCEL_VAAPI(mpeg2), #endif #if CONFIG_MPEG2_VDPAU_HWACCEL HWACCEL_VDPAU(mpeg2), #endif #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL HWACCEL_VIDEOTOOLBOX(mpeg2), #endif NULL }, }; //legacy decoder const FFCodec ff_mpegvideo_decoder = { .p.name = "mpegvideo", CODEC_LONG_NAME("MPEG-1 video"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_MPEG2VIDEO, .priv_data_size = sizeof(Mpeg1Context), .init = mpeg_decode_init, .close = mpeg_decode_end, FF_CODEC_DECODE_CB(mpeg_decode_frame), .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS, .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, .flush = flush, .p.max_lowres = 3, }; typedef struct IPUContext { MpegEncContext m; int flags; DECLARE_ALIGNED(32, int16_t, block)[6][64]; } IPUContext; static int ipu_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt) { IPUContext *s = avctx->priv_data; MpegEncContext *m = &s->m; GetBitContext *gb = &m->gb; int ret; // Check for minimal intra MB size (considering mb header, luma & chroma dc VLC, ac EOB VLC) if (avpkt->size*8LL < (avctx->width+15)/16 * ((avctx->height+15)/16) * (2LL + 3*4 + 2*2 + 2*6)) return AVERROR_INVALIDDATA; ret = ff_get_buffer(avctx, frame, 0); if (ret < 0) return ret; ret = init_get_bits8(gb, avpkt->data, avpkt->size); if (ret < 0) return ret; s->flags = get_bits(gb, 8); m->intra_dc_precision = s->flags & 3; m->q_scale_type = !!(s->flags & 0x40); m->intra_vlc_format = !!(s->flags & 0x20); m->alternate_scan = !!(s->flags & 0x10); ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, s->flags & 0x10 ? ff_alternate_vertical_scan : ff_zigzag_direct); m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3)); m->qscale = 1; for (int y = 0; y < avctx->height; y += 16) { int intraquant; for (int x = 0; x < avctx->width; x += 16) { if (x || y) { if (!get_bits1(gb)) return AVERROR_INVALIDDATA; } if (get_bits1(gb)) { intraquant = 0; } else { if (!get_bits1(gb)) return AVERROR_INVALIDDATA; intraquant = 1; } if (s->flags & 4) skip_bits1(gb); if (intraquant) m->qscale = mpeg_get_qscale(m); memset(s->block, 0, sizeof(s->block)); for (int n = 0; n < 6; n++) { if (s->flags & 0x80) { ret = ff_mpeg1_decode_block_intra(&m->gb, m->intra_matrix, m->intra_scantable.permutated, m->last_dc, s->block[n], n, m->qscale); } else { ret = mpeg2_decode_block_intra(m, s->block[n], n); } if (ret < 0) return ret; } m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x, frame->linesize[0], s->block[0]); m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8, frame->linesize[0], s->block[1]); m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x, frame->linesize[0], s->block[2]); m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8, frame->linesize[0], s->block[3]); m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1), frame->linesize[1], s->block[4]); m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1), frame->linesize[2], s->block[5]); } } align_get_bits(gb); if (get_bits_left(gb) != 32) return AVERROR_INVALIDDATA; *got_frame = 1; return avpkt->size; } static av_cold int ipu_decode_init(AVCodecContext *avctx) { IPUContext *s = avctx->priv_data; MpegEncContext *m = &s->m; avctx->pix_fmt = AV_PIX_FMT_YUV420P; m->avctx = avctx; ff_idctdsp_init(&m->idsp, avctx); ff_mpeg12_init_vlcs(); for (int i = 0; i < 64; i++) { int j = m->idsp.idct_permutation[i]; int v = ff_mpeg1_default_intra_matrix[i]; m->intra_matrix[j] = v; m->chroma_intra_matrix[j] = v; } return 0; } const FFCodec ff_ipu_decoder = { .p.name = "ipu", CODEC_LONG_NAME("IPU Video"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_IPU, .priv_data_size = sizeof(IPUContext), .init = ipu_decode_init, FF_CODEC_DECODE_CB(ipu_decode_frame), .p.capabilities = AV_CODEC_CAP_DR1, };