/* * Electronic Arts TGQ Video Decoder * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org> * * 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 St, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Electronic Arts TGQ Video Decoder * @author Peter Ross <pross@xvid.org> * * Technical details here: * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ */ #include "avcodec.h" #define BITSTREAM_READER_LE #include "get_bits.h" #include "bytestream.h" #include "dsputil.h" #include "aandcttab.h" #include "eaidct.h" #include "internal.h" typedef struct TgqContext { AVCodecContext *avctx; int width, height; ScanTable scantable; int qtable[64]; DECLARE_ALIGNED(16, int16_t, block)[6][64]; GetByteContext gb; } TgqContext; static av_cold int tgq_decode_init(AVCodecContext *avctx) { TgqContext *s = avctx->priv_data; uint8_t idct_permutation[64]; s->avctx = avctx; ff_init_scantable_permutation(idct_permutation, FF_NO_IDCT_PERM); ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct); avctx->time_base = (AVRational){1, 15}; avctx->pix_fmt = AV_PIX_FMT_YUV420P; return 0; } static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb) { uint8_t *perm = s->scantable.permutated; int i, j, value; block[0] = get_sbits(gb, 8) * s->qtable[0]; for (i = 1; i < 64;) { switch (show_bits(gb, 3)) { case 4: block[perm[i++]] = 0; case 0: block[perm[i++]] = 0; skip_bits(gb, 3); break; case 5: case 1: skip_bits(gb, 2); value = get_bits(gb, 6); for (j = 0; j < value; j++) block[perm[i++]] = 0; break; case 6: skip_bits(gb, 3); block[perm[i]] = -s->qtable[perm[i]]; i++; break; case 2: skip_bits(gb, 3); block[perm[i]] = s->qtable[perm[i]]; i++; break; case 7: // 111b case 3: // 011b skip_bits(gb, 2); if (show_bits(gb, 6) == 0x3F) { skip_bits(gb, 6); block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]]; } else { block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]]; } i++; break; } } block[0] += 128 << 4; } static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame, int mb_x, int mb_y) { int linesize = frame->linesize[0]; uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; ff_ea_idct_put_c(dest_y , linesize, block[0]); ff_ea_idct_put_c(dest_y + 8, linesize, block[1]); ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]); ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]); if (!(s->avctx->flags & CODEC_FLAG_GRAY)) { ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]); ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]); } } static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc) { int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4); int j; for (j = 0; j < 8; j++) memset(dst + j * dst_stride, level, 8); } static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame, int mb_x, int mb_y, const int8_t *dc) { int linesize = frame->linesize[0]; uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; tgq_dconly(s, dest_y, linesize, dc[0]); tgq_dconly(s, dest_y + 8, linesize, dc[1]); tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]); tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]); if (!(s->avctx->flags & CODEC_FLAG_GRAY)) { tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]); tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]); } } static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x) { int mode; int i; int8_t dc[6]; mode = bytestream2_get_byte(&s->gb); if (mode > 12) { GetBitContext gb; init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode)); for (i = 0; i < 6; i++) tgq_decode_block(s, s->block[i], &gb); tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y); bytestream2_skip(&s->gb, mode); } else { if (mode == 3) { memset(dc, bytestream2_get_byte(&s->gb), 4); dc[4] = bytestream2_get_byte(&s->gb); dc[5] = bytestream2_get_byte(&s->gb); } else if (mode == 6) { bytestream2_get_buffer(&s->gb, dc, 6); } else if (mode == 12) { for (i = 0; i < 6; i++) { dc[i] = bytestream2_get_byte(&s->gb); bytestream2_skip(&s->gb, 1); } } else { av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); return -1; } tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc); } return 0; } static void tgq_calculate_qtable(TgqContext *s, int quant) { int i, j; const int a = (14 * (100 - quant)) / 100 + 1; const int b = (11 * (100 - quant)) / 100 + 4; for (j = 0; j < 8; j++) for (i = 0; i < 8; i++) s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) * ff_inv_aanscales[j * 8 + i]) >> (14 - 4); } static int tgq_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; TgqContext *s = avctx->priv_data; AVFrame *frame = data; int x, y, ret; int big_endian; if (buf_size < 16) { av_log(avctx, AV_LOG_WARNING, "truncated header\n"); return AVERROR_INVALIDDATA; } big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; bytestream2_init(&s->gb, buf + 8, buf_size - 8); if (big_endian) { s->width = bytestream2_get_be16u(&s->gb); s->height = bytestream2_get_be16u(&s->gb); } else { s->width = bytestream2_get_le16u(&s->gb); s->height = bytestream2_get_le16u(&s->gb); } ret = ff_set_dimensions(s->avctx, s->width, s->height); if (ret < 0) return ret; tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb)); bytestream2_skip(&s->gb, 3); if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; frame->key_frame = 1; frame->pict_type = AV_PICTURE_TYPE_I; for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++) for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++) if (tgq_decode_mb(s, frame, y, x) < 0) return AVERROR_INVALIDDATA; *got_frame = 1; return avpkt->size; } AVCodec ff_eatgq_decoder = { .name = "eatgq", .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_TGQ, .priv_data_size = sizeof(TgqContext), .init = tgq_decode_init, .decode = tgq_decode_frame, .capabilities = CODEC_CAP_DR1, };