mirror of https://git.ffmpeg.org/ffmpeg.git
Electronic Arts Madcow decoder
Originally committed as revision 19178 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Peter Ross
parent
86b61d4241
commit
c63ea92bf2
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@ -24,6 +24,7 @@ version <next>:
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- SoX native format muxer and demuxer
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- AMR-NB decoding/encoding, AMR-WB decoding via OpenCORE libraries
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- DPX image decoder
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- Electronic Arts Madcow decoder
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@ -356,6 +356,7 @@ following image formats are supported:
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@tab Codec originally used in Feeble Files game.
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@item Electronic Arts CMV video @tab @tab X
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@tab Used in NHL 95 game.
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@item Electronic Arts Madcow video @tab @tab X
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@item Electronic Arts TGV video @tab @tab X
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@item Electronic Arts TGQ video @tab @tab X
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@item Electronic Arts TQI video @tab @tab X
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@ -76,6 +76,7 @@ OBJS-$(CONFIG_DVVIDEO_ENCODER) += dv.o
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OBJS-$(CONFIG_DXA_DECODER) += dxa.o
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OBJS-$(CONFIG_EAC3_DECODER) += eac3dec.o ac3dec.o ac3tab.o ac3dec_data.o ac3.o
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OBJS-$(CONFIG_EACMV_DECODER) += eacmv.o
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OBJS-$(CONFIG_EAMAD_DECODER) += eamad.o eaidct.o
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OBJS-$(CONFIG_EATGQ_DECODER) += eatgq.o eaidct.o
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OBJS-$(CONFIG_EATGV_DECODER) += eatgv.o
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OBJS-$(CONFIG_EATQI_DECODER) += eatqi.o eaidct.o mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o
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@ -81,6 +81,7 @@ void avcodec_register_all(void)
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REGISTER_ENCDEC (DVVIDEO, dvvideo);
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REGISTER_DECODER (DXA, dxa);
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REGISTER_DECODER (EACMV, eacmv);
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REGISTER_DECODER (EAMAD, eamad);
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REGISTER_DECODER (EATGQ, eatgq);
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REGISTER_DECODER (EATGV, eatgv);
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REGISTER_DECODER (EATQI, eatqi);
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@ -30,7 +30,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVCODEC_VERSION_MAJOR 52
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#define LIBAVCODEC_VERSION_MINOR 30
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#define LIBAVCODEC_VERSION_MINOR 31
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#define LIBAVCODEC_VERSION_MICRO 2
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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@ -197,6 +197,7 @@ enum CodecID {
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CODEC_ID_TMV,
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CODEC_ID_V210,
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CODEC_ID_DPX,
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CODEC_ID_MAD,
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/* various PCM "codecs" */
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CODEC_ID_PCM_S16LE= 0x10000,
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@ -0,0 +1,318 @@
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/*
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* Electronic Arts Madcow Video Decoder
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* Copyright (c) 2007-2009 Peter Ross
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavcodec/eamad.c
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* Electronic Arts Madcow Video Decoder
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* by Peter Ross <pross@xvid.org>
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*
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* Technical details here:
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* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dsputil.h"
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#include "aandcttab.h"
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#include "mpeg12.h"
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#include "mpeg12data.h"
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#define EA_PREAMBLE_SIZE 8
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#define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD i-frame */
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#define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD p-frame */
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#define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
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typedef struct MadContext {
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MpegEncContext s;
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AVFrame frame;
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AVFrame last_frame;
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void *bitstream_buf;
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unsigned int bitstream_buf_size;
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DECLARE_ALIGNED_16(DCTELEM, block[64]);
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} MadContext;
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static void bswap16_buf(uint16_t *dst, const uint16_t *src, int count)
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{
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int i;
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for (i=0; i<count; i++)
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dst[i] = bswap_16(src[i]);
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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MadContext *t = avctx->priv_data;
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MpegEncContext *s = &t->s;
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s->avctx = avctx;
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avctx->pix_fmt = PIX_FMT_YUV420P;
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if (avctx->idct_algo == FF_IDCT_AUTO)
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avctx->idct_algo = FF_IDCT_EA;
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dsputil_init(&s->dsp, avctx);
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ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
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ff_mpeg12_init_vlcs();
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return 0;
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}
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static inline void comp(unsigned char *dst, int dst_stride,
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unsigned char *src, int src_stride, int add)
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{
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int j, i;
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for (j=0; j<8; j++)
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for (i=0; i<8; i++)
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dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
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}
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static inline void comp_block(MadContext *t, int mb_x, int mb_y,
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int j, int mv_x, int mv_y, int add)
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{
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MpegEncContext *s = &t->s;
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if (j < 4) {
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comp(t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
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t->frame.linesize[0],
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t->last_frame.data[0] + (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame.linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x,
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t->last_frame.linesize[0], add);
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} else if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
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int index = j - 3;
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comp(t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x * 8,
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t->frame.linesize[index],
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t->last_frame.data[index] + (mb_y * 8 + (mv_y/2))*t->last_frame.linesize[index] + mb_x * 8 + (mv_x/2),
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t->last_frame.linesize[index], add);
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}
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}
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static inline void idct_put(MadContext *t, DCTELEM *block, int mb_x, int mb_y, int j)
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{
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MpegEncContext *s = &t->s;
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if (j < 4) {
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s->dsp.idct_put(
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t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
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t->frame.linesize[0], block);
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} else if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
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int index = j - 3;
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s->dsp.idct_put(
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t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x*8,
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t->frame.linesize[index], block);
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}
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}
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static inline void decode_block_intra(MadContext * t, DCTELEM * block)
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{
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MpegEncContext *s = &t->s;
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int level, i, j, run;
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RLTable *rl = &ff_rl_mpeg1;
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const uint8_t *scantable = s->intra_scantable.permutated;
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int16_t *quant_matrix = s->intra_matrix;
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block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
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/* The RL decoder is derived from mpeg1_decode_block_intra;
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Escaped level and run values a decoded differently */
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{
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OPEN_READER(re, &s->gb);
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/* now quantify & encode AC coefficients */
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for (;;) {
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UPDATE_CACHE(re, &s->gb);
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GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
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if (level == 127) {
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break;
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} else if (level != 0) {
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i += run;
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j = scantable[i];
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level = (level*quant_matrix[j]) >> 4;
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level = (level-1)|1;
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level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
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LAST_SKIP_BITS(re, &s->gb, 1);
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} else {
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/* escape */
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UPDATE_CACHE(re, &s->gb);
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level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
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UPDATE_CACHE(re, &s->gb);
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run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
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i += run;
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j = scantable[i];
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if (level < 0) {
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level = -level;
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level = (level*quant_matrix[j]) >> 4;
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level = (level-1)|1;
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level = -level;
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} else {
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level = (level*quant_matrix[j]) >> 4;
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level = (level-1)|1;
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}
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}
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if (i > 63) {
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av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
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return;
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}
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block[j] = level;
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}
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CLOSE_READER(re, &s->gb);
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}
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}
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static int decode_motion(GetBitContext *gb)
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{
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int value = 0;
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if (get_bits1(gb)) {
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if (get_bits1(gb))
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value = -17;
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value += get_bits(gb, 4) + 1;
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}
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return value;
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}
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static void decode_mb(MadContext *t, int inter)
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{
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MpegEncContext *s = &t->s;
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int mv_map = 0;
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int mv_x, mv_y;
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int j;
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if (inter) {
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int v = decode210(&s->gb);
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if (v < 2) {
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mv_map = v ? get_bits(&s->gb, 6) : 63;
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mv_x = decode_motion(&s->gb);
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mv_y = decode_motion(&s->gb);
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} else {
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mv_map = 0;
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}
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}
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for (j=0; j<6; j++) {
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if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
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int add = 2*decode_motion(&s->gb);
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comp_block(t, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
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} else {
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s->dsp.clear_block(t->block);
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decode_block_intra(t, t->block);
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idct_put(t, t->block, s->mb_x, s->mb_y, j);
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}
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}
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}
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static void calc_intra_matrix(MadContext *t, int qscale)
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{
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MpegEncContext *s = &t->s;
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int i;
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if (s->avctx->idct_algo == FF_IDCT_EA) {
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s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
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for (i=1; i<64; i++)
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s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
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} else {
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s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
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for (i=1; i<64; i++)
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s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale) << 1;
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}
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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const uint8_t *buf_end = buf+buf_size;
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MadContext *t = avctx->priv_data;
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MpegEncContext *s = &t->s;
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int chunk_type;
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int inter;
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if (buf_size < 17) {
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av_log(avctx, AV_LOG_ERROR, "Input buffer too small\n");
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*data_size = 0;
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return -1;
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}
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chunk_type = AV_RL32(&buf[0]);
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inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
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buf += 8;
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av_reduce(&avctx->time_base.num, &avctx->time_base.den,
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AV_RL16(&buf[6]), 1000, 1<<30);
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s->width = AV_RL16(&buf[8]);
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s->height = AV_RL16(&buf[10]);
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calc_intra_matrix(t, buf[13]);
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buf += 16;
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if (avctx->width != s->width || avctx->height != s->height) {
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if (avcodec_check_dimensions(avctx, s->width, s->height) < 0)
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return -1;
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avcodec_set_dimensions(avctx, s->width, s->height);
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if (t->frame.data[0])
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avctx->release_buffer(avctx, &t->frame);
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}
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t->frame.reference = 1;
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if (!t->frame.data[0]) {
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if (avctx->get_buffer(avctx, &t->frame) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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}
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av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!t->bitstream_buf)
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return AVERROR(ENOMEM);
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bswap16_buf(t->bitstream_buf, (const uint16_t*)buf, (buf_end-buf)/2);
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init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
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for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
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for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
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decode_mb(t, inter);
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = t->frame;
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if (chunk_type != MADe_TAG)
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FFSWAP(AVFrame, t->frame, t->last_frame);
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return buf_size;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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MadContext *t = avctx->priv_data;
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if (t->frame.data[0])
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avctx->release_buffer(avctx, &t->frame);
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if (t->last_frame.data[0])
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avctx->release_buffer(avctx, &t->last_frame);
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av_free(t->bitstream_buf);
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return 0;
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}
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AVCodec eamad_decoder = {
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"eamad",
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CODEC_TYPE_VIDEO,
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CODEC_ID_MAD,
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sizeof(MadContext),
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decode_init,
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NULL,
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decode_end,
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decode_frame,
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CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video")
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};
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