mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 8898 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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41fe055242
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d2e911fac8
3 changed files with 101 additions and 79 deletions
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/*
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* MPEG4 Video frame extraction |
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* Copyright (c) 2003 Fabrice Bellard. |
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* Copyright (c) 2003 Michael Niedermayer. |
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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 Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "parser.h" |
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#include "mpegvideo.h" |
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/* XXX: make it use less memory */ |
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static int av_mpeg4_decode_header(AVCodecParserContext *s1, |
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AVCodecContext *avctx, |
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const uint8_t *buf, int buf_size) |
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{ |
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ParseContext1 *pc = s1->priv_data; |
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MpegEncContext *s = pc->enc; |
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GetBitContext gb1, *gb = &gb1; |
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int ret; |
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s->avctx = avctx; |
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s->current_picture_ptr = &s->current_picture; |
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if (avctx->extradata_size && pc->first_picture){ |
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init_get_bits(gb, avctx->extradata, avctx->extradata_size*8); |
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ret = ff_mpeg4_decode_picture_header(s, gb); |
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} |
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init_get_bits(gb, buf, 8 * buf_size); |
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ret = ff_mpeg4_decode_picture_header(s, gb); |
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if (s->width) { |
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avcodec_set_dimensions(avctx, s->width, s->height); |
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} |
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s1->pict_type= s->pict_type; |
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pc->first_picture = 0; |
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return ret; |
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} |
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static int mpeg4video_parse_init(AVCodecParserContext *s) |
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{ |
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ParseContext1 *pc = s->priv_data; |
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pc->enc = av_mallocz(sizeof(MpegEncContext)); |
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if (!pc->enc) |
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return -1; |
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pc->first_picture = 1; |
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return 0; |
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} |
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static int mpeg4video_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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ParseContext *pc = s->priv_data; |
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int next; |
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if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ |
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next= buf_size; |
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}else{ |
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next= ff_mpeg4_find_frame_end(pc, buf, buf_size); |
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if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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} |
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av_mpeg4_decode_header(s, avctx, buf, buf_size); |
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*poutbuf = (uint8_t *)buf; |
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*poutbuf_size = buf_size; |
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return next; |
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} |
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AVCodecParser mpeg4video_parser = { |
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{ CODEC_ID_MPEG4 }, |
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sizeof(ParseContext1), |
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mpeg4video_parse_init, |
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mpeg4video_parse, |
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ff_parse1_close, |
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ff_mpeg4video_split, |
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}; |
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