/* * MPEG4 decoder. * Copyright (c) 2000,2001 Fabrice Bellard * Copyright (c) 2002-2010 Michael Niedermayer * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "error_resilience.h" #include "internal.h" #include "mpegvideo.h" #include "mpeg4video.h" #include "h263.h" #include "thread.h" /* The defines below define the number of bits that are read at once for * reading vlc values. Changing these may improve speed and data cache needs * be aware though that decreasing them may need the number of stages that is * passed to get_vlc* to be increased. */ #define SPRITE_TRAJ_VLC_BITS 6 #define DC_VLC_BITS 9 #define MB_TYPE_B_VLC_BITS 4 static VLC dc_lum, dc_chrom; static VLC sprite_trajectory; static VLC mb_type_b_vlc; static const int mb_type_b_map[4] = { MB_TYPE_DIRECT2 | MB_TYPE_L0L1, MB_TYPE_L0L1 | MB_TYPE_16x16, MB_TYPE_L1 | MB_TYPE_16x16, MB_TYPE_L0 | MB_TYPE_16x16, }; /** * Predict the ac. * @param n block index (0-3 are luma, 4-5 are chroma) * @param dir the ac prediction direction */ void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir) { int i; int16_t *ac_val, *ac_val1; int8_t *const qscale_table = s->current_picture.qscale_table; /* find prediction */ ac_val = s->ac_val[0][0] + s->block_index[n] * 16; ac_val1 = ac_val; if (s->ac_pred) { if (dir == 0) { const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride; /* left prediction */ ac_val -= 16; if (s->mb_x == 0 || s->qscale == qscale_table[xy] || n == 1 || n == 3) { /* same qscale */ for (i = 1; i < 8; i++) block[s->dsp.idct_permutation[i << 3]] += ac_val[i]; } else { /* different qscale, we must rescale */ for (i = 1; i < 8; i++) block[s->dsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale); } } else { const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride; /* top prediction */ ac_val -= 16 * s->block_wrap[n]; if (s->mb_y == 0 || s->qscale == qscale_table[xy] || n == 2 || n == 3) { /* same qscale */ for (i = 1; i < 8; i++) block[s->dsp.idct_permutation[i]] += ac_val[i + 8]; } else { /* different qscale, we must rescale */ for (i = 1; i < 8; i++) block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale); } } } /* left copy */ for (i = 1; i < 8; i++) ac_val1[i] = block[s->dsp.idct_permutation[i << 3]]; /* top copy */ for (i = 1; i < 8; i++) ac_val1[8 + i] = block[s->dsp.idct_permutation[i]]; } /** * check if the next stuff is a resync marker or the end. * @return 0 if not */ static inline int mpeg4_is_resync(MpegEncContext *s) { int bits_count = get_bits_count(&s->gb); int v = show_bits(&s->gb, 16); if (s->workaround_bugs & FF_BUG_NO_PADDING) return 0; while (v <= 0xFF) { if (s->pict_type == AV_PICTURE_TYPE_B || (v >> (8 - s->pict_type) != 1) || s->partitioned_frame) break; skip_bits(&s->gb, 8 + s->pict_type); bits_count += 8 + s->pict_type; v = show_bits(&s->gb, 16); } if (bits_count + 8 >= s->gb.size_in_bits) { v >>= 8; v |= 0x7F >> (7 - (bits_count & 7)); if (v == 0x7F) return 1; } else { if (v == ff_mpeg4_resync_prefix[bits_count & 7]) { int len; GetBitContext gb = s->gb; skip_bits(&s->gb, 1); align_get_bits(&s->gb); for (len = 0; len < 32; len++) if (get_bits1(&s->gb)) break; s->gb = gb; if (len >= ff_mpeg4_get_video_packet_prefix_length(s)) return 1; } } return 0; } static int mpeg4_decode_sprite_trajectory(MpegEncContext *s, GetBitContext *gb) { int a = 2 << s->sprite_warping_accuracy; int rho = 3 - s->sprite_warping_accuracy; int r = 16 / a; int alpha = 0; int beta = 0; int w = s->width; int h = s->height; int min_ab, i, w2, h2, w3, h3; int sprite_ref[4][2]; int virtual_ref[2][2]; // only true for rectangle shapes const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 }, { 0, s->height }, { s->width, s->height } }; int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } }; if (w <= 0 || h <= 0) return AVERROR_INVALIDDATA; for (i = 0; i < s->num_sprite_warping_points; i++) { int length; int x = 0, y = 0; length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); if (length) x = get_xbits(gb, length); if (!(s->divx_version == 500 && s->divx_build == 413)) skip_bits1(gb); /* marker bit */ length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3); if (length) y = get_xbits(gb, length); skip_bits1(gb); /* marker bit */ s->sprite_traj[i][0] = d[i][0] = x; s->sprite_traj[i][1] = d[i][1] = y; } for (; i < 4; i++) s->sprite_traj[i][0] = s->sprite_traj[i][1] = 0; while ((1 << alpha) < w) alpha++; while ((1 << beta) < h) beta++; /* typo in the mpeg4 std for the definition of w' and h' */ w2 = 1 << alpha; h2 = 1 << beta; // Note, the 4th point isn't used for GMC if (s->divx_version == 500 && s->divx_build == 413) { sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0]; sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1]; sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0]; sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1]; sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0]; sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1]; } else { sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]); sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]); sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]); sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]); sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]); sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]); } /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]); * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */ /* this is mostly identical to the mpeg4 std (and is totally unreadable * because of that...). Perhaps it should be reordered to be more readable. * The idea behind this virtual_ref mess is to be able to use shifts later * per pixel instead of divides so the distance between points is converted * from w&h based to w2&h2 based which are of the 2^x form. */ virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) + ROUNDED_DIV(((w - w2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) + w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w); virtual_ref[0][1] = 16 * vop_ref[0][1] + ROUNDED_DIV(((w - w2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) + w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w); virtual_ref[1][0] = 16 * vop_ref[0][0] + ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) + h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h); virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) + ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) + h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h); switch (s->num_sprite_warping_points) { case 0: s->sprite_offset[0][0] = s->sprite_offset[0][1] = s->sprite_offset[1][0] = s->sprite_offset[1][1] = 0; s->sprite_delta[0][0] = a; s->sprite_delta[0][1] = s->sprite_delta[1][0] = 0; s->sprite_delta[1][1] = a; s->sprite_shift[0] = s->sprite_shift[1] = 0; break; case 1: // GMC only s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0]; s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1]; s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) - a * (vop_ref[0][0] / 2); s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) - a * (vop_ref[0][1] / 2); s->sprite_delta[0][0] = a; s->sprite_delta[0][1] = s->sprite_delta[1][0] = 0; s->sprite_delta[1][1] = a; s->sprite_shift[0] = s->sprite_shift[1] = 0; break; case 2: s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) + (-r * sprite_ref[0][0] + virtual_ref[0][0]) * (-vop_ref[0][0]) + (r * sprite_ref[0][1] - virtual_ref[0][1]) * (-vop_ref[0][1]) + (1 << (alpha + rho - 1)); s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) + (-r * sprite_ref[0][1] + virtual_ref[0][1]) * (-vop_ref[0][0]) + (-r * sprite_ref[0][0] + virtual_ref[0][0]) * (-vop_ref[0][1]) + (1 << (alpha + rho - 1)); s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) * (-2 * vop_ref[0][0] + 1) + (r * sprite_ref[0][1] - virtual_ref[0][1]) * (-2 * vop_ref[0][1] + 1) + 2 * w2 * r * sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1))); s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) * (-2 * vop_ref[0][0] + 1) + (-r * sprite_ref[0][0] + virtual_ref[0][0]) * (-2 * vop_ref[0][1] + 1) + 2 * w2 * r * sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1))); s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]); s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]); s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]); s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]); s->sprite_shift[0] = alpha + rho; s->sprite_shift[1] = alpha + rho + 2; break; case 3: min_ab = FFMIN(alpha, beta); w3 = w2 >> min_ab; h3 = h2 >> min_ab; s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) + (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) + (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) + (1 << (alpha + beta + rho - min_ab - 1)); s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) + (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) + (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) + (1 << (alpha + beta + rho - min_ab - 1)); s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) + (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 + (1 << (alpha + beta + rho - min_ab + 1)); s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) + (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 + (1 << (alpha + beta + rho - min_ab + 1)); s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3; s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3; s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3; s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3; s->sprite_shift[0] = alpha + beta + rho - min_ab; s->sprite_shift[1] = alpha + beta + rho - min_ab + 2; break; } /* try to simplify the situation */ if (s->sprite_delta[0][0] == a << s->sprite_shift[0] && s->sprite_delta[0][1] == 0 && s->sprite_delta[1][0] == 0 && s->sprite_delta[1][1] == a << s->sprite_shift[0]) { s->sprite_offset[0][0] >>= s->sprite_shift[0]; s->sprite_offset[0][1] >>= s->sprite_shift[0]; s->sprite_offset[1][0] >>= s->sprite_shift[1]; s->sprite_offset[1][1] >>= s->sprite_shift[1]; s->sprite_delta[0][0] = a; s->sprite_delta[0][1] = 0; s->sprite_delta[1][0] = 0; s->sprite_delta[1][1] = a; s->sprite_shift[0] = 0; s->sprite_shift[1] = 0; s->real_sprite_warping_points = 1; } else { int shift_y = 16 - s->sprite_shift[0]; int shift_c = 16 - s->sprite_shift[1]; for (i = 0; i < 2; i++) { s->sprite_offset[0][i] <<= shift_y; s->sprite_offset[1][i] <<= shift_c; s->sprite_delta[0][i] <<= shift_y; s->sprite_delta[1][i] <<= shift_y; s->sprite_shift[i] = 16; } s->real_sprite_warping_points = s->num_sprite_warping_points; } return 0; } /** * Decode the next video packet. * @return <0 if something went wrong */ int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx) { MpegEncContext *s = &ctx->m; int mb_num_bits = av_log2(s->mb_num - 1) + 1; int header_extension = 0, mb_num, len; /* is there enough space left for a video packet + header */ if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20) return -1; for (len = 0; len < 32; len++) if (get_bits1(&s->gb)) break; if (len != ff_mpeg4_get_video_packet_prefix_length(s)) { av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n"); return -1; } if (ctx->shape != RECT_SHAPE) { header_extension = get_bits1(&s->gb); // FIXME more stuff here } mb_num = get_bits(&s->gb, mb_num_bits); if (mb_num >= s->mb_num) { av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num); return -1; } if (s->pict_type == AV_PICTURE_TYPE_B) { int mb_x = 0, mb_y = 0; while (s->next_picture.mbskip_table[s->mb_index2xy[mb_num]]) { if (!mb_x) ff_thread_await_progress(&s->next_picture_ptr->tf, mb_y++, 0); mb_num++; if (++mb_x == s->mb_width) mb_x = 0; } if (mb_num >= s->mb_num) return -1; // slice contains just skipped MBs (already decoded) } s->mb_x = mb_num % s->mb_width; s->mb_y = mb_num / s->mb_width; if (ctx->shape != BIN_ONLY_SHAPE) { int qscale = get_bits(&s->gb, s->quant_precision); if (qscale) s->chroma_qscale = s->qscale = qscale; } if (ctx->shape == RECT_SHAPE) header_extension = get_bits1(&s->gb); if (header_extension) { int time_incr = 0; while (get_bits1(&s->gb) != 0) time_incr++; check_marker(&s->gb, "before time_increment in video packed header"); skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */ check_marker(&s->gb, "before vop_coding_type in video packed header"); skip_bits(&s->gb, 2); /* vop coding type */ // FIXME not rect stuff here if (ctx->shape != BIN_ONLY_SHAPE) { skip_bits(&s->gb, 3); /* intra dc vlc threshold */ // FIXME don't just ignore everything if (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE) { if (mpeg4_decode_sprite_trajectory(s, &s->gb) < 0) return AVERROR_INVALIDDATA; av_log(s->avctx, AV_LOG_ERROR, "untested\n"); } // FIXME reduced res stuff here if (s->pict_type != AV_PICTURE_TYPE_I) { int f_code = get_bits(&s->gb, 3); /* fcode_for */ if (f_code == 0) av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n"); } if (s->pict_type == AV_PICTURE_TYPE_B) { int b_code = get_bits(&s->gb, 3); if (b_code == 0) av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n"); } } } // FIXME new-pred stuff return 0; } /** * Get the average motion vector for a GMC MB. * @param n either 0 for the x component or 1 for y * @return the average MV for a GMC MB */ static inline int get_amv(MpegEncContext *s, int n) { int x, y, mb_v, sum, dx, dy, shift; int len = 1 << (s->f_code + 4); const int a = s->sprite_warping_accuracy; if (s->workaround_bugs & FF_BUG_AMV) len >>= s->quarter_sample; if (s->real_sprite_warping_points == 1) { if (s->divx_version == 500 && s->divx_build == 413) sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample)); else sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a); } else { dx = s->sprite_delta[n][0]; dy = s->sprite_delta[n][1]; shift = s->sprite_shift[0]; if (n) dy -= 1 << (shift + a + 1); else dx -= 1 << (shift + a + 1); mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16; sum = 0; for (y = 0; y < 16; y++) { int v; v = mb_v + dy * y; // FIXME optimize for (x = 0; x < 16; x++) { sum += v >> shift; v += dx; } } sum = RSHIFT(sum, a + 8 - s->quarter_sample); } if (sum < -len) sum = -len; else if (sum >= len) sum = len - 1; return sum; } /** * Decode the dc value. * @param n block index (0-3 are luma, 4-5 are chroma) * @param dir_ptr the prediction direction will be stored here * @return the quantized dc */ static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr) { int level, code; if (n < 4) code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1); else code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1); if (code < 0 || code > 9 /* && s->nbit < 9 */) { av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n"); return -1; } if (code == 0) { level = 0; } else { if (IS_3IV1) { if (code == 1) level = 2 * get_bits1(&s->gb) - 1; else { if (get_bits1(&s->gb)) level = get_bits(&s->gb, code - 1) + (1 << (code - 1)); else level = -get_bits(&s->gb, code - 1) - (1 << (code - 1)); } } else { level = get_xbits(&s->gb, code); } if (code > 8) { if (get_bits1(&s->gb) == 0) { /* marker */ if (s->err_recognition & AV_EF_BITSTREAM) { av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n"); return -1; } } } } return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0); } /** * Decode first partition. * @return number of MBs decoded or <0 if an error occurred */ static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx) { MpegEncContext *s = &ctx->m; int mb_num = 0; static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; /* decode first partition */ s->first_slice_line = 1; for (; s->mb_y < s->mb_height; s->mb_y++) { ff_init_block_index(s); for (; s->mb_x < s->mb_width; s->mb_x++) { const int xy = s->mb_x + s->mb_y * s->mb_stride; int cbpc; int dir = 0; mb_num++; ff_update_block_index(s); if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) s->first_slice_line = 0; if (s->pict_type == AV_PICTURE_TYPE_I) { int i; do { if (show_bits_long(&s->gb, 19) == DC_MARKER) return mb_num - 1; cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); if (cbpc < 0) { av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } } while (cbpc == 8); s->cbp_table[xy] = cbpc & 3; s->current_picture.mb_type[xy] = MB_TYPE_INTRA; s->mb_intra = 1; if (cbpc & 4) ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); s->current_picture.qscale_table[xy] = s->qscale; s->mbintra_table[xy] = 1; for (i = 0; i < 6; i++) { int dc_pred_dir; int dc = mpeg4_decode_dc(s, i, &dc_pred_dir); if (dc < 0) { av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } dir <<= 1; if (dc_pred_dir) dir |= 1; } s->pred_dir_table[xy] = dir; } else { /* P/S_TYPE */ int mx, my, pred_x, pred_y, bits; int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]]; const int stride = s->b8_stride * 2; try_again: bits = show_bits(&s->gb, 17); if (bits == MOTION_MARKER) return mb_num - 1; skip_bits1(&s->gb); if (bits & 0x10000) { /* skip mb */ if (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE) { s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0; mx = get_amv(s, 0); my = get_amv(s, 1); } else { s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; mx = my = 0; } mot_val[0] = mot_val[2] = mot_val[0 + stride] = mot_val[2 + stride] = mx; mot_val[1] = mot_val[3] = mot_val[1 + stride] = mot_val[3 + stride] = my; if (s->mbintra_table[xy]) ff_clean_intra_table_entries(s); continue; } cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); if (cbpc < 0) { av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } if (cbpc == 20) goto try_again; s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant s->mb_intra = ((cbpc & 4) != 0); if (s->mb_intra) { s->current_picture.mb_type[xy] = MB_TYPE_INTRA; s->mbintra_table[xy] = 1; mot_val[0] = mot_val[2] = mot_val[0 + stride] = mot_val[2 + stride] = 0; mot_val[1] = mot_val[3] = mot_val[1 + stride] = mot_val[3 + stride] = 0; } else { if (s->mbintra_table[xy]) ff_clean_intra_table_entries(s); if (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0) s->mcsel = get_bits1(&s->gb); else s->mcsel = 0; if ((cbpc & 16) == 0) { /* 16x16 motion prediction */ ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); if (!s->mcsel) { mx = ff_h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = ff_h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; } else { mx = get_amv(s, 0); my = get_amv(s, 1); s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0; } mot_val[0] = mot_val[2] = mot_val[0 + stride] = mot_val[2 + stride] = mx; mot_val[1] = mot_val[3] = mot_val[1 + stride] = mot_val[3 + stride] = my; } else { int i; s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; for (i = 0; i < 4; i++) { int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); mx = ff_h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = ff_h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; mot_val[0] = mx; mot_val[1] = my; } } } } } s->mb_x = 0; } return mb_num; } /** * decode second partition. * @return <0 if an error occurred */ static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count) { int mb_num = 0; static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; s->mb_x = s->resync_mb_x; s->first_slice_line = 1; for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) { ff_init_block_index(s); for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) { const int xy = s->mb_x + s->mb_y * s->mb_stride; mb_num++; ff_update_block_index(s); if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) s->first_slice_line = 0; if (s->pict_type == AV_PICTURE_TYPE_I) { int ac_pred = get_bits1(&s->gb); int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if (cbpy < 0) { av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } s->cbp_table[xy] |= cbpy << 2; s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED; } else { /* P || S_TYPE */ if (IS_INTRA(s->current_picture.mb_type[xy])) { int i; int dir = 0; int ac_pred = get_bits1(&s->gb); int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if (cbpy < 0) { av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } if (s->cbp_table[xy] & 8) ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); s->current_picture.qscale_table[xy] = s->qscale; for (i = 0; i < 6; i++) { int dc_pred_dir; int dc = mpeg4_decode_dc(s, i, &dc_pred_dir); if (dc < 0) { av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } dir <<= 1; if (dc_pred_dir) dir |= 1; } s->cbp_table[xy] &= 3; // remove dquant s->cbp_table[xy] |= cbpy << 2; s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED; s->pred_dir_table[xy] = dir; } else if (IS_SKIP(s->current_picture.mb_type[xy])) { s->current_picture.qscale_table[xy] = s->qscale; s->cbp_table[xy] = 0; } else { int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if (cbpy < 0) { av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y); return -1; } if (s->cbp_table[xy] & 8) ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); s->current_picture.qscale_table[xy] = s->qscale; s->cbp_table[xy] &= 3; // remove dquant s->cbp_table[xy] |= (cbpy ^ 0xf) << 2; } } } if (mb_num >= mb_count) return 0; s->mb_x = 0; } return 0; } /** * Decode the first and second partition. * @return <0 if error (and sets error type in the error_status_table) */ int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx) { MpegEncContext *s = &ctx->m; int mb_num; const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR; const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END; mb_num = mpeg4_decode_partition_a(ctx); if (mb_num < 0) { ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error); return -1; } if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) { av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n"); ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error); return -1; } s->mb_num_left = mb_num; if (s->pict_type == AV_PICTURE_TYPE_I) { while (show_bits(&s->gb, 9) == 1) skip_bits(&s->gb, 9); if (get_bits_long(&s->gb, 19) != DC_MARKER) { av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y); return -1; } } else { while (show_bits(&s->gb, 10) == 1) skip_bits(&s->gb, 10); if (get_bits(&s->gb, 17) != MOTION_MARKER) { av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y); return -1; } } ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y, part_a_end); if (mpeg4_decode_partition_b(s, mb_num) < 0) { if (s->pict_type == AV_PICTURE_TYPE_P) ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_DC_ERROR); return -1; } else { if (s->pict_type == AV_PICTURE_TYPE_P) ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y, ER_DC_END); } return 0; } /** * Decode a block. * @return <0 if an error occurred */ static inline int mpeg4_decode_block(MpegEncContext *s, int16_t *block, int n, int coded, int intra, int rvlc) { int level, i, last, run, qmul, qadd, dc_pred_dir; RLTable *rl; RL_VLC_ELEM *rl_vlc; const uint8_t *scan_table; // Note intra & rvlc should be optimized away if this is inlined if (intra) { if (s->use_intra_dc_vlc) { /* DC coef */ if (s->partitioned_frame) { level = s->dc_val[0][s->block_index[n]]; if (n < 4) level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale); else level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale); dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32; } else { level = mpeg4_decode_dc(s, n, &dc_pred_dir); if (level < 0) return -1; } block[0] = level; i = 0; } else { i = -1; ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0); } if (!coded) goto not_coded; if (rvlc) { rl = &ff_rvlc_rl_intra; rl_vlc = ff_rvlc_rl_intra.rl_vlc[0]; } else { rl = &ff_mpeg4_rl_intra; rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0]; } if (s->ac_pred) { if (dc_pred_dir == 0) scan_table = s->intra_v_scantable.permutated; /* left */ else scan_table = s->intra_h_scantable.permutated; /* top */ } else { scan_table = s->intra_scantable.permutated; } qmul = 1; qadd = 0; } else { i = -1; if (!coded) { s->block_last_index[n] = i; return 0; } if (rvlc) rl = &ff_rvlc_rl_inter; else rl = &ff_h263_rl_inter; scan_table = s->intra_scantable.permutated; if (s->mpeg_quant) { qmul = 1; qadd = 0; if (rvlc) rl_vlc = ff_rvlc_rl_inter.rl_vlc[0]; else rl_vlc = ff_h263_rl_inter.rl_vlc[0]; } else { qmul = s->qscale << 1; qadd = (s->qscale - 1) | 1; if (rvlc) rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale]; else rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale]; } } { OPEN_READER(re, &s->gb); for (;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0); if (level == 0) { /* escape */ if (rvlc) { if (SHOW_UBITS(re, &s->gb, 1) == 0) { av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n"); return -1; } SKIP_CACHE(re, &s->gb, 1); last = SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); run = SHOW_UBITS(re, &s->gb, 6); SKIP_COUNTER(re, &s->gb, 1 + 1 + 6); UPDATE_CACHE(re, &s->gb); if (SHOW_UBITS(re, &s->gb, 1) == 0) { av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n"); return -1; } SKIP_CACHE(re, &s->gb, 1); level = SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11); if (SHOW_UBITS(re, &s->gb, 5) != 0x10) { av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n"); return -1; } SKIP_CACHE(re, &s->gb, 5); level = level * qmul + qadd; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1); i += run + 1; if (last) i += 192; } else { int cache; cache = GET_CACHE(re, &s->gb); if (IS_3IV1) cache ^= 0xC0000000; if (cache & 0x80000000) { if (cache & 0x40000000) { /* third escape */ SKIP_CACHE(re, &s->gb, 2); last = SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); run = SHOW_UBITS(re, &s->gb, 6); SKIP_COUNTER(re, &s->gb, 2 + 1 + 6); UPDATE_CACHE(re, &s->gb); if (IS_3IV1) { level = SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12); } else { if (SHOW_UBITS(re, &s->gb, 1) == 0) { av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n"); return -1; } SKIP_CACHE(re, &s->gb, 1); level = SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12); if (SHOW_UBITS(re, &s->gb, 1) == 0) { av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n"); return -1; } SKIP_COUNTER(re, &s->gb, 1 + 12 + 1); } if (level > 0) level = level * qmul + qadd; else level = level * qmul - qadd; if ((unsigned)(level + 2048) > 4095) { if (s->err_recognition & AV_EF_BITSTREAM) { if (level > 2560 || level < -2560) { av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale); return -1; } } level = level < 0 ? -2048 : 2047; } i += run + 1; if (last) i += 192; } else { /* second escape */ SKIP_BITS(re, &s->gb, 2); GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } } else { /* first escape */ SKIP_BITS(re, &s->gb, 1); GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); i += run; level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } } } else { i += run; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } if (i > 62) { i -= 192; if (i & (~63)) { av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } block[scan_table[i]] = level; break; } block[scan_table[i]] = level; } CLOSE_READER(re, &s->gb); } not_coded: if (intra) { if (!s->use_intra_dc_vlc) { block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0); i -= i >> 31; // if (i == -1) i = 0; } ff_mpeg4_pred_ac(s, block, n, dc_pred_dir); if (s->ac_pred) i = 63; // FIXME not optimal } s->block_last_index[n] = i; return 0; } /** * decode partition C of one MB. * @return <0 if an error occurred */ static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64]) { Mpeg4DecContext *ctx = (Mpeg4DecContext *)s; int cbp, mb_type; const int xy = s->mb_x + s->mb_y * s->mb_stride; mb_type = s->current_picture.mb_type[xy]; cbp = s->cbp_table[xy]; s->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold; if (s->current_picture.qscale_table[xy] != s->qscale) ff_set_qscale(s, s->current_picture.qscale_table[xy]); if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_S) { int i; for (i = 0; i < 4; i++) { s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0]; s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1]; } s->mb_intra = IS_INTRA(mb_type); if (IS_SKIP(mb_type)) { /* skip mb */ for (i = 0; i < 6; i++) s->block_last_index[i] = -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; if (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE) { s->mcsel = 1; s->mb_skipped = 0; } else { s->mcsel = 0; s->mb_skipped = 1; } } else if (s->mb_intra) { s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); } else if (!s->mb_intra) { // s->mcsel = 0; // FIXME do we need to init that? s->mv_dir = MV_DIR_FORWARD; if (IS_8X8(mb_type)) { s->mv_type = MV_TYPE_8X8; } else { s->mv_type = MV_TYPE_16X16; } } } else { /* I-Frame */ s->mb_intra = 1; s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]); } if (!IS_SKIP(mb_type)) { int i; s->dsp.clear_blocks(s->block[0]); /* decode each block */ for (i = 0; i < 6; i++) { if (mpeg4_decode_block(s, block[i], i, cbp & 32, s->mb_intra, s->rvlc) < 0) { av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra); return -1; } cbp += cbp; } } /* per-MB end of slice check */ if (--s->mb_num_left <= 0) { if (mpeg4_is_resync(s)) return SLICE_END; else return SLICE_NOEND; } else { if (mpeg4_is_resync(s)) { const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1; if (s->cbp_table[xy + delta]) return SLICE_END; } return SLICE_OK; } } static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64]) { Mpeg4DecContext *ctx = (Mpeg4DecContext *)s; int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant; int16_t *mot_val; static int8_t quant_tab[4] = { -1, -2, 1, 2 }; const int xy = s->mb_x + s->mb_y * s->mb_stride; assert(s->h263_pred); if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_S) { do { if (get_bits1(&s->gb)) { /* skip mb */ s->mb_intra = 0; for (i = 0; i < 6; i++) s->block_last_index[i] = -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; if (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE) { s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0; s->mcsel = 1; s->mv[0][0][0] = get_amv(s, 0); s->mv[0][0][1] = get_amv(s, 1); s->mb_skipped = 0; } else { s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; s->mcsel = 0; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; s->mb_skipped = 1; } goto end; } cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); if (cbpc < 0) { av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } } while (cbpc == 20); s->dsp.clear_blocks(s->block[0]); dquant = cbpc & 8; s->mb_intra = ((cbpc & 4) != 0); if (s->mb_intra) goto intra; if (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0) s->mcsel = get_bits1(&s->gb); else s->mcsel = 0; cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F; cbp = (cbpc & 3) | (cbpy << 2); if (dquant) ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); if ((!s->progressive_sequence) && (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE))) s->interlaced_dct = get_bits1(&s->gb); s->mv_dir = MV_DIR_FORWARD; if ((cbpc & 16) == 0) { if (s->mcsel) { s->current_picture.mb_type[xy] = MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0; /* 16x16 global motion prediction */ s->mv_type = MV_TYPE_16X16; mx = get_amv(s, 0); my = get_amv(s, 1); s->mv[0][0][0] = mx; s->mv[0][0][1] = my; } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) { s->current_picture.mb_type[xy] = MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED; /* 16x8 field motion prediction */ s->mv_type = MV_TYPE_FIELD; s->field_select[0][0] = get_bits1(&s->gb); s->field_select[0][1] = get_bits1(&s->gb); ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); for (i = 0; i < 2; i++) { mx = ff_h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = ff_h263_decode_motion(s, pred_y / 2, s->f_code); if (my >= 0xffff) return -1; s->mv[0][i][0] = mx; s->mv[0][i][1] = my; } } else { s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; /* 16x16 motion prediction */ s->mv_type = MV_TYPE_16X16; ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); mx = ff_h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = ff_h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; s->mv[0][0][0] = mx; s->mv[0][0][1] = my; } } else { s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; s->mv_type = MV_TYPE_8X8; for (i = 0; i < 4; i++) { mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); mx = ff_h263_decode_motion(s, pred_x, s->f_code); if (mx >= 0xffff) return -1; my = ff_h263_decode_motion(s, pred_y, s->f_code); if (my >= 0xffff) return -1; s->mv[0][i][0] = mx; s->mv[0][i][1] = my; mot_val[0] = mx; mot_val[1] = my; } } } else if (s->pict_type == AV_PICTURE_TYPE_B) { int modb1; // first bit of modb int modb2; // second bit of modb int mb_type; s->mb_intra = 0; // B-frames never contain intra blocks s->mcsel = 0; // ... true gmc blocks if (s->mb_x == 0) { for (i = 0; i < 2; i++) { s->last_mv[i][0][0] = s->last_mv[i][0][1] = s->last_mv[i][1][0] = s->last_mv[i][1][1] = 0; } ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0); } /* if we skipped it in the future P Frame than skip it now too */ s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC if (s->mb_skipped) { /* skip mb */ for (i = 0; i < 6; i++) s->block_last_index[i] = -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; s->mv[0][0][0] = s->mv[0][0][1] = s->mv[1][0][0] = s->mv[1][0][1] = 0; s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; goto end; } modb1 = get_bits1(&s->gb); if (modb1) { // like MB_TYPE_B_DIRECT but no vectors coded mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; cbp = 0; } else { modb2 = get_bits1(&s->gb); mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1); if (mb_type < 0) { av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n"); return -1; } mb_type = mb_type_b_map[mb_type]; if (modb2) { cbp = 0; } else { s->dsp.clear_blocks(s->block[0]); cbp = get_bits(&s->gb, 6); } if ((!IS_DIRECT(mb_type)) && cbp) { if (get_bits1(&s->gb)) ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2); } if (!s->progressive_sequence) { if (cbp) s->interlaced_dct = get_bits1(&s->gb); if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) { mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; mb_type &= ~MB_TYPE_16x16; if (USES_LIST(mb_type, 0)) { s->field_select[0][0] = get_bits1(&s->gb); s->field_select[0][1] = get_bits1(&s->gb); } if (USES_LIST(mb_type, 1)) { s->field_select[1][0] = get_bits1(&s->gb); s->field_select[1][1] = get_bits1(&s->gb); } } } s->mv_dir = 0; if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) { s->mv_type = MV_TYPE_16X16; if (USES_LIST(mb_type, 0)) { s->mv_dir = MV_DIR_FORWARD; mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code); my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code); s->last_mv[0][1][0] = s->last_mv[0][0][0] = s->mv[0][0][0] = mx; s->last_mv[0][1][1] = s->last_mv[0][0][1] = s->mv[0][0][1] = my; } if (USES_LIST(mb_type, 1)) { s->mv_dir |= MV_DIR_BACKWARD; mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code); my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code); s->last_mv[1][1][0] = s->last_mv[1][0][0] = s->mv[1][0][0] = mx; s->last_mv[1][1][1] = s->last_mv[1][0][1] = s->mv[1][0][1] = my; } } else if (!IS_DIRECT(mb_type)) { s->mv_type = MV_TYPE_FIELD; if (USES_LIST(mb_type, 0)) { s->mv_dir = MV_DIR_FORWARD; for (i = 0; i < 2; i++) { mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code); my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code); s->last_mv[0][i][0] = s->mv[0][i][0] = mx; s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2; } } if (USES_LIST(mb_type, 1)) { s->mv_dir |= MV_DIR_BACKWARD; for (i = 0; i < 2; i++) { mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code); my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code); s->last_mv[1][i][0] = s->mv[1][i][0] = mx; s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2; } } } } if (IS_DIRECT(mb_type)) { if (IS_SKIP(mb_type)) { mx = my = 0; } else { mx = ff_h263_decode_motion(s, 0, 1); my = ff_h263_decode_motion(s, 0, 1); } s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT; mb_type |= ff_mpeg4_set_direct_mv(s, mx, my); } s->current_picture.mb_type[xy] = mb_type; } else { /* I-Frame */ do { cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); if (cbpc < 0) { av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } } while (cbpc == 8); dquant = cbpc & 4; s->mb_intra = 1; intra: s->ac_pred = get_bits1(&s->gb); if (s->ac_pred) s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED; else s->current_picture.mb_type[xy] = MB_TYPE_INTRA; cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if (cbpy < 0) { av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } cbp = (cbpc & 3) | (cbpy << 2); s->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold; if (dquant) ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]); if (!s->progressive_sequence) s->interlaced_dct = get_bits1(&s->gb); s->dsp.clear_blocks(s->block[0]); /* decode each block */ for (i = 0; i < 6; i++) { if (mpeg4_decode_block(s, block[i], i, cbp & 32, 1, 0) < 0) return -1; cbp += cbp; } goto end; } /* decode each block */ for (i = 0; i < 6; i++) { if (mpeg4_decode_block(s, block[i], i, cbp & 32, 0, 0) < 0) return -1; cbp += cbp; } end: /* per-MB end of slice check */ if (s->codec_id == AV_CODEC_ID_MPEG4) { if (mpeg4_is_resync(s)) { const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1; if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.mbskip_table[xy + delta]) { ff_thread_await_progress(&s->next_picture_ptr->tf, (s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y + 1, s->mb_height - 1) : s->mb_y, 0); } if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.mbskip_table[xy + delta]) return SLICE_OK; return SLICE_END; } } return SLICE_OK; } static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb) { int hours, minutes, seconds; unsigned time_code = show_bits(gb, 18); if (time_code & 0x40) { /* marker_bit */ hours = time_code >> 13; minutes = time_code >> 7 & 0x3f; seconds = time_code & 0x3f; s->time_base = seconds + 60 * (minutes + 60 * hours); skip_bits(gb, 20); /* time_code, closed_gov, broken_link */ } else { av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n"); } return 0; } static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb) { int profile_and_level_indication; profile_and_level_indication = get_bits(gb, 8); s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4; s->avctx->level = (profile_and_level_indication & 0x0f); // for Simple profile, level 0 if (s->avctx->profile == 0 && s->avctx->level == 8) { s->avctx->level = 0; } return 0; } static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb) { MpegEncContext *s = &ctx->m; int width, height, vo_ver_id; /* vol header */ skip_bits(gb, 1); /* random access */ s->vo_type = get_bits(gb, 8); if (get_bits1(gb) != 0) { /* is_ol_id */ vo_ver_id = get_bits(gb, 4); /* vo_ver_id */ skip_bits(gb, 3); /* vo_priority */ } else { vo_ver_id = 1; } s->aspect_ratio_info = get_bits(gb, 4); if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) { s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height } else { s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info]; } if ((s->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */ int chroma_format = get_bits(gb, 2); if (chroma_format != CHROMA_420) av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n"); s->low_delay = get_bits1(gb); if (get_bits1(gb)) { /* vbv parameters */ get_bits(gb, 15); /* first_half_bitrate */ skip_bits1(gb); /* marker */ get_bits(gb, 15); /* latter_half_bitrate */ skip_bits1(gb); /* marker */ get_bits(gb, 15); /* first_half_vbv_buffer_size */ skip_bits1(gb); /* marker */ get_bits(gb, 3); /* latter_half_vbv_buffer_size */ get_bits(gb, 11); /* first_half_vbv_occupancy */ skip_bits1(gb); /* marker */ get_bits(gb, 15); /* latter_half_vbv_occupancy */ skip_bits1(gb); /* marker */ } } else { /* is setting low delay flag only once the smartest thing to do? * low delay detection won't be overriden. */ if (s->picture_number == 0) s->low_delay = 0; } ctx->shape = get_bits(gb, 2); /* vol shape */ if (ctx->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n"); if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) { av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n"); skip_bits(gb, 4); /* video_object_layer_shape_extension */ } check_marker(gb, "before time_increment_resolution"); s->avctx->time_base.den = get_bits(gb, 16); if (!s->avctx->time_base.den) { av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n"); s->avctx->time_base.num = 0; return -1; } ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1; if (ctx->time_increment_bits < 1) ctx->time_increment_bits = 1; check_marker(gb, "before fixed_vop_rate"); if (get_bits1(gb) != 0) /* fixed_vop_rate */ s->avctx->time_base.num = get_bits(gb, ctx->time_increment_bits); else s->avctx->time_base.num = 1; s->t_frame = 0; if (ctx->shape != BIN_ONLY_SHAPE) { if (ctx->shape == RECT_SHAPE) { skip_bits1(gb); /* marker */ width = get_bits(gb, 13); skip_bits1(gb); /* marker */ height = get_bits(gb, 13); skip_bits1(gb); /* marker */ if (width && height && /* they should be non zero but who knows */ !(s->width && s->codec_tag == AV_RL32("MP4S"))) { if (s->width && s->height && (s->width != width || s->height != height)) s->context_reinit = 1; s->width = width; s->height = height; } } s->progressive_sequence = s->progressive_frame = get_bits1(gb) ^ 1; s->interlaced_dct = 0; if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO)) av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */ "MPEG4 OBMC not supported (very likely buggy encoder)\n"); if (vo_ver_id == 1) ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */ else ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */ if (ctx->vol_sprite_usage == STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n"); if (ctx->vol_sprite_usage == STATIC_SPRITE || ctx->vol_sprite_usage == GMC_SPRITE) { if (ctx->vol_sprite_usage == STATIC_SPRITE) { skip_bits(gb, 13); // sprite_width skip_bits1(gb); /* marker */ skip_bits(gb, 13); // sprite_height skip_bits1(gb); /* marker */ skip_bits(gb, 13); // sprite_left skip_bits1(gb); /* marker */ skip_bits(gb, 13); // sprite_top skip_bits1(gb); /* marker */ } s->num_sprite_warping_points = get_bits(gb, 6); if (s->num_sprite_warping_points > 3) { av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points); s->num_sprite_warping_points = 0; return -1; } s->sprite_warping_accuracy = get_bits(gb, 2); s->sprite_brightness_change = get_bits1(gb); if (ctx->vol_sprite_usage == STATIC_SPRITE) s->low_latency_sprite = get_bits1(gb); } // FIXME sadct disable bit if verid!=1 && shape not rect if (get_bits1(gb) == 1) { /* not_8_bit */ s->quant_precision = get_bits(gb, 4); /* quant_precision */ if (get_bits(gb, 4) != 8) /* bits_per_pixel */ av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); if (s->quant_precision != 5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision); } else { s->quant_precision = 5; } // FIXME a bunch of grayscale shape things if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */ int i, v; /* load default matrixes */ for (i = 0; i < 64; i++) { int j = s->dsp.idct_permutation[i]; v = ff_mpeg4_default_intra_matrix[i]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; v = ff_mpeg4_default_non_intra_matrix[i]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } /* load custom intra matrix */ if (get_bits1(gb)) { int last = 0; for (i = 0; i < 64; i++) { int j; v = get_bits(gb, 8); if (v == 0) break; last = v; j = s->dsp.idct_permutation[ff_zigzag_direct[i]]; s->intra_matrix[j] = last; s->chroma_intra_matrix[j] = last; } /* replicate last value */ for (; i < 64; i++) { int j = s->dsp.idct_permutation[ff_zigzag_direct[i]]; s->intra_matrix[j] = last; s->chroma_intra_matrix[j] = last; } } /* load custom non intra matrix */ if (get_bits1(gb)) { int last = 0; for (i = 0; i < 64; i++) { int j; v = get_bits(gb, 8); if (v == 0) break; last = v; j = s->dsp.idct_permutation[ff_zigzag_direct[i]]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } /* replicate last value */ for (; i < 64; i++) { int j = s->dsp.idct_permutation[ff_zigzag_direct[i]]; s->inter_matrix[j] = last; s->chroma_inter_matrix[j] = last; } } // FIXME a bunch of grayscale shape things } if (vo_ver_id != 1) s->quarter_sample = get_bits1(gb); else s->quarter_sample = 0; if (!get_bits1(gb)) { int pos = get_bits_count(gb); int estimation_method = get_bits(gb, 2); if (estimation_method < 2) { if (!get_bits1(gb)) { s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */ } if (!get_bits1(gb)) { s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */ s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */ s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */ } if (!check_marker(gb, "in complexity estimation part 1")) { skip_bits_long(gb, pos - get_bits_count(gb)); goto no_cplx_est; } if (!get_bits1(gb)) { s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */ s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */ s->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */ } if (!get_bits1(gb)) { s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */ s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */ s->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */ s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */ s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */ s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */ } if (!check_marker(gb, "in complexity estimation part 2")) { skip_bits_long(gb, pos - get_bits_count(gb)); goto no_cplx_est; } if (estimation_method == 1) { s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */ s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */ } } else av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method); } else { no_cplx_est: s->cplx_estimation_trash_i = s->cplx_estimation_trash_p = s->cplx_estimation_trash_b = 0; } s->resync_marker = !get_bits1(gb); /* resync_marker_disabled */ s->data_partitioning = get_bits1(gb); if (s->data_partitioning) s->rvlc = get_bits1(gb); if (vo_ver_id != 1) { s->new_pred = get_bits1(gb); if (s->new_pred) { av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n"); skip_bits(gb, 2); /* requested upstream message type */ skip_bits1(gb); /* newpred segment type */ } s->reduced_res_vop = get_bits1(gb); if (s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n"); } else { s->new_pred = 0; s->reduced_res_vop = 0; } s->scalability = get_bits1(gb); if (s->scalability) { GetBitContext bak = *gb; int h_sampling_factor_n; int h_sampling_factor_m; int v_sampling_factor_n; int v_sampling_factor_m; s->hierachy_type = get_bits1(gb); skip_bits(gb, 4); /* ref_layer_id */ skip_bits1(gb); /* ref_layer_sampling_dir */ h_sampling_factor_n = get_bits(gb, 5); h_sampling_factor_m = get_bits(gb, 5); v_sampling_factor_n = get_bits(gb, 5); v_sampling_factor_m = get_bits(gb, 5); s->enhancement_type = get_bits1(gb); if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 || v_sampling_factor_n == 0 || v_sampling_factor_m == 0) { /* illegal scalability header (VERY broken encoder), * trying to workaround */ s->scalability = 0; *gb = bak; } else av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n"); // bin shape stuff FIXME } } return 0; } /** * Decode the user data stuff in the header. * Also initializes divx/xvid/lavc_version/build. */ static int decode_user_data(MpegEncContext *s, GetBitContext *gb) { char buf[256]; int i; int e; int ver = 0, build = 0, ver2 = 0, ver3 = 0; char last; for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) { if (show_bits(gb, 23) == 0) break; buf[i] = get_bits(gb, 8); } buf[i] = 0; /* divx detection */ e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last); if (e < 2) e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last); if (e >= 2) { s->divx_version = ver; s->divx_build = build; s->divx_packed = e == 3 && last == 'p'; if (s->divx_packed && !s->showed_packed_warning) { av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n"); s->showed_packed_warning = 1; } } /* libavcodec detection */ e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3; if (e != 4) e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build); if (e != 4) { e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1; if (e > 1) build = (ver << 16) + (ver2 << 8) + ver3; } if (e != 4) { if (strcmp(buf, "ffmpeg") == 0) s->lavc_build = 4600; } if (e == 4) s->lavc_build = build; /* Xvid detection */ e = sscanf(buf, "XviD%d", &build); if (e == 1) s->xvid_build = build; return 0; } static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb) { MpegEncContext *s = &ctx->m; int time_incr, time_increment; s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */ if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) { av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n"); s->low_delay = 0; } s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B; if (s->partitioned_frame) s->decode_mb = mpeg4_decode_partitioned_mb; else s->decode_mb = mpeg4_decode_mb; time_incr = 0; while (get_bits1(gb) != 0) time_incr++; check_marker(gb, "before time_increment"); if (ctx->time_increment_bits == 0 || !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) { av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n"); for (ctx->time_increment_bits = 1; ctx->time_increment_bits < 16; ctx->time_increment_bits++) { if (s->pict_type == AV_PICTURE_TYPE_P || (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE)) { if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30) break; } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18) break; } av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n", ctx->time_increment_bits); } if (IS_3IV1) time_increment = get_bits1(gb); // FIXME investigate further else time_increment = get_bits(gb, ctx->time_increment_bits); if (s->pict_type != AV_PICTURE_TYPE_B) { s->last_time_base = s->time_base; s->time_base += time_incr; s->time = s->time_base * s->avctx->time_base.den + time_increment; if (s->workaround_bugs & FF_BUG_UMP4) { if (s->time < s->last_non_b_time) { /* header is not mpeg-4-compatible, broken encoder, * trying to workaround */ s->time_base++; s->time += s->avctx->time_base.den; } } s->pp_time = s->time - s->last_non_b_time; s->last_non_b_time = s->time; } else { s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment; s->pb_time = s->pp_time - (s->last_non_b_time - s->time); if (s->pp_time <= s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time <= 0) { /* messed up order, maybe after seeking? skipping current b-frame */ return FRAME_SKIPPED; } ff_mpeg4_init_direct_mv(s); if (s->t_frame == 0) s->t_frame = s->pb_time; if (s->t_frame == 0) s->t_frame = 1; // 1/0 protection s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, s->t_frame) - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame)) * 2; s->pb_field_time = (ROUNDED_DIV(s->time, s->t_frame) - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame)) * 2; if (!s->progressive_sequence) { if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) return FRAME_SKIPPED; } } check_marker(gb, "before vop_coded"); /* vop coded */ if (get_bits1(gb) != 1) { if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n"); return FRAME_SKIPPED; } if (ctx->shape != BIN_ONLY_SHAPE && (s->pict_type == AV_PICTURE_TYPE_P || (s->pict_type == AV_PICTURE_TYPE_S && ctx->vol_sprite_usage == GMC_SPRITE))) { /* rounding type for motion estimation */ s->no_rounding = get_bits1(gb); } else { s->no_rounding = 0; } // FIXME reduced res stuff if (ctx->shape != RECT_SHAPE) { if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) { skip_bits(gb, 13); /* width */ skip_bits1(gb); /* marker */ skip_bits(gb, 13); /* height */ skip_bits1(gb); /* marker */ skip_bits(gb, 13); /* hor_spat_ref */ skip_bits1(gb); /* marker */ skip_bits(gb, 13); /* ver_spat_ref */ } skip_bits1(gb); /* change_CR_disable */ if (get_bits1(gb) != 0) skip_bits(gb, 8); /* constant_alpha_value */ } // FIXME complexity estimation stuff if (ctx->shape != BIN_ONLY_SHAPE) { skip_bits_long(gb, s->cplx_estimation_trash_i); if (s->pict_type != AV_PICTURE_TYPE_I) skip_bits_long(gb, s->cplx_estimation_trash_p); if (s->pict_type == AV_PICTURE_TYPE_B) skip_bits_long(gb, s->cplx_estimation_trash_b); s->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)]; if (!s->progressive_sequence) { s->top_field_first = get_bits1(gb); s->alternate_scan = get_bits1(gb); } else s->alternate_scan = 0; } if (s->alternate_scan) { ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); } else { ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct); ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan); } if (s->pict_type == AV_PICTURE_TYPE_S && (ctx->vol_sprite_usage == STATIC_SPRITE || ctx->vol_sprite_usage == GMC_SPRITE)) { if (mpeg4_decode_sprite_trajectory(s, gb) < 0) return AVERROR_INVALIDDATA; if (s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n"); if (ctx->vol_sprite_usage == STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n"); } if (ctx->shape != BIN_ONLY_SHAPE) { s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision); if (s->qscale == 0) { av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n"); return -1; // makes no sense to continue, as there is nothing left from the image then } if (s->pict_type != AV_PICTURE_TYPE_I) { s->f_code = get_bits(gb, 3); /* fcode_for */ if (s->f_code == 0) { av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n"); return -1; // makes no sense to continue, as there is nothing left from the image then } } else s->f_code = 1; if (s->pict_type == AV_PICTURE_TYPE_B) { s->b_code = get_bits(gb, 3); } else s->b_code = 1; if (s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n", s->qscale, s->f_code, s->b_code, 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")), gb->size_in_bits, s->progressive_sequence, s->alternate_scan, s->top_field_first, s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points, s->sprite_warping_accuracy, 1 - s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b); } if (!s->scalability) { if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I) skip_bits1(gb); // vop shape coding type } else { if (s->enhancement_type) { int load_backward_shape = get_bits1(gb); if (load_backward_shape) av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n"); } skip_bits(gb, 2); // ref_select_code } } /* detect buggy encoders which don't set the low_delay flag * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames * easily (although it's buggy too) */ if (s->vo_type == 0 && s->vol_control_parameters == 0 && s->divx_version == -1 && s->picture_number == 0) { av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n"); s->low_delay = 1; } s->picture_number++; // better than pic number==0 always ;) // FIXME add short header support s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table; s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table; if (s->workaround_bugs & FF_BUG_EDGE) { s->h_edge_pos = s->width; s->v_edge_pos = s->height; } return 0; } /** * Decode mpeg4 headers. * @return <0 if no VOP found (or a damaged one) * FRAME_SKIPPED if a not coded VOP is found * 0 if a VOP is found */ int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb) { MpegEncContext *s = &ctx->m; unsigned startcode, v; /* search next start code */ align_get_bits(gb); if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) { skip_bits(gb, 24); if (get_bits(gb, 8) == 0xF0) goto end; } startcode = 0xff; for (;;) { if (get_bits_count(gb) >= gb->size_in_bits) { if (gb->size_in_bits == 8 && (s->divx_version >= 0 || s->xvid_build >= 0)) { av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits); return FRAME_SKIPPED; // divx bug } else return -1; // end of stream } /* use the bits after the test */ v = get_bits(gb, 8); startcode = ((startcode << 8) | v) & 0xffffffff; if ((startcode & 0xFFFFFF00) != 0x100) continue; // no startcode if (s->avctx->debug & FF_DEBUG_STARTCODE) { av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode); if (startcode <= 0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start"); else if (startcode <= 0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start"); else if (startcode <= 0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); else if (startcode <= 0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start"); else if (startcode <= 0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved"); else if (startcode == 0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start"); else if (startcode == 0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End"); else if (startcode == 0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data"); else if (startcode == 0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start"); else if (startcode == 0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error"); else if (startcode == 0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start"); else if (startcode == 0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start"); else if (startcode == 0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start"); else if (startcode == 0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start"); else if (startcode == 0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start"); else if (startcode == 0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start"); else if (startcode == 0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start"); else if (startcode == 0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start"); else if (startcode == 0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start"); else if (startcode == 0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start"); else if (startcode == 0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start"); else if (startcode == 0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start"); else if (startcode == 0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start"); else if (startcode == 0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start"); else if (startcode == 0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start"); else if (startcode <= 0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved"); else if (startcode <= 0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start"); av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb)); } if (startcode >= 0x120 && startcode <= 0x12F) { if (decode_vol_header(ctx, gb) < 0) return -1; } else if (startcode == USER_DATA_STARTCODE) { decode_user_data(s, gb); } else if (startcode == GOP_STARTCODE) { mpeg4_decode_gop_header(s, gb); } else if (startcode == VOS_STARTCODE) { mpeg4_decode_profile_level(s, gb); } else if (startcode == VOP_STARTCODE) { break; } align_get_bits(gb); startcode = 0xff; } end: if (s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay = 1; s->avctx->has_b_frames = !s->low_delay; return decode_vop_header(ctx, gb); } static int mpeg4_update_thread_context(AVCodecContext *dst, const AVCodecContext *src) { Mpeg4DecContext *s = dst->priv_data; const Mpeg4DecContext *s1 = src->priv_data; int ret = ff_mpeg_update_thread_context(dst, src); if (ret < 0) return ret; s->shape = s1->shape; s->time_increment_bits = s1->time_increment_bits; return 0; } static av_cold int decode_init(AVCodecContext *avctx) { Mpeg4DecContext *ctx = avctx->priv_data; MpegEncContext *s = &ctx->m; int ret; static int done = 0; s->divx_version = s->divx_build = s->xvid_build = s->lavc_build = -1; if ((ret = ff_h263_decode_init(avctx)) < 0) return ret; if (!done) { done = 1; ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]); ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]); ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]); INIT_VLC_RL(ff_mpeg4_rl_intra, 554); INIT_VLC_RL(ff_rvlc_rl_inter, 1072); INIT_VLC_RL(ff_rvlc_rl_intra, 1072); INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */, &ff_mpeg4_DCtab_lum[0][1], 2, 1, &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512); INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */, &ff_mpeg4_DCtab_chrom[0][1], 2, 1, &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512); INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15, &ff_sprite_trajectory_tab[0][1], 4, 2, &ff_sprite_trajectory_tab[0][0], 4, 2, 128); INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4, &ff_mb_type_b_tab[0][1], 2, 1, &ff_mb_type_b_tab[0][0], 2, 1, 16); } s->h263_pred = 1; s->low_delay = 0; /* default, might be overriden in the vol header during header parsing */ s->decode_mb = mpeg4_decode_mb; ctx->time_increment_bits = 4; /* default value for broken headers */ avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; avctx->internal->allocate_progress = 1; return 0; } static const AVProfile mpeg4_video_profiles[] = { { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" }, { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" }, { FF_PROFILE_MPEG4_CORE, "Core Profile" }, { FF_PROFILE_MPEG4_MAIN, "Main Profile" }, { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" }, { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" }, { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" }, { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" }, { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" }, { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" }, { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" }, { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" }, { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" }, { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" }, { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" }, { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" }, }; AVCodec ff_mpeg4_decoder = { .name = "mpeg4", .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MPEG4, .priv_data_size = sizeof(Mpeg4DecContext), .init = decode_init, .close = ff_h263_decode_end, .decode = ff_h263_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS, .flush = ff_mpeg_flush, .pix_fmts = ff_h263_hwaccel_pixfmt_list_420, .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles), .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context), };