diff options
author | Diego Biurrun <diego@biurrun.de> | 2007-05-04 04:09:33 +0400 |
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committer | Diego Biurrun <diego@biurrun.de> | 2007-05-04 04:09:33 +0400 |
commit | 5982ae94eef6b0d0ef23f33cc8759c8d6e1ab736 (patch) | |
tree | 937730e6f97ed5df16ed87e991685193fc3c9b7e /libavcodec/vc1_parser.c | |
parent | 98c98e04ccae75ccaf0f3ebf18588bc0090dff8b (diff) |
Move VC1 parser to its own file.
Originally committed as revision 8882 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vc1_parser.c')
-rw-r--r-- | libavcodec/vc1_parser.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/libavcodec/vc1_parser.c b/libavcodec/vc1_parser.c new file mode 100644 index 0000000000..1476f9c229 --- /dev/null +++ b/libavcodec/vc1_parser.c @@ -0,0 +1,118 @@ +/* + * VC-1 and WMV3 parser + * Copyright (c) 2006-2007 Konstantin Shishkov + * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file vc1_parser.c + * VC-1 and WMV3 parser + */ +#include "dsputil.h" +#include "parser.h" +#include "vc1.h" + +/** + * finds the end of the current frame in the bitstream. + * @return the position of the first byte of the next frame, or -1 + */ +static int vc1_find_frame_end(ParseContext *pc, const uint8_t *buf, + int buf_size) { + int pic_found, i; + uint32_t state; + + pic_found= pc->frame_start_found; + state= pc->state; + + i=0; + if(!pic_found){ + for(i=0; i<buf_size; i++){ + state= (state<<8) | buf[i]; + if(state == VC1_CODE_FRAME || state == VC1_CODE_FIELD){ + i++; + pic_found=1; + break; + } + } + } + + if(pic_found){ + /* EOF considered as end of frame */ + if (buf_size == 0) + return 0; + for(; i<buf_size; i++){ + state= (state<<8) | buf[i]; + if(IS_MARKER(state) && state != VC1_CODE_FIELD && state != VC1_CODE_SLICE){ + pc->frame_start_found=0; + pc->state=-1; + return i-3; + } + } + } + pc->frame_start_found= pic_found; + pc->state= state; + return END_NOT_FOUND; +} + +static int vc1_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + ParseContext *pc = s->priv_data; + int next; + + if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ + next= buf_size; + }else{ + next= vc1_find_frame_end(pc, buf, buf_size); + + if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + } + *poutbuf = (uint8_t *)buf; + *poutbuf_size = buf_size; + return next; +} + +static int vc1_split(AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + int i; + uint32_t state= -1; + + for(i=0; i<buf_size; i++){ + state= (state<<8) | buf[i]; + if(IS_MARKER(state) && state != VC1_CODE_SEQHDR && state != VC1_CODE_ENTRYPOINT) + return i-3; + } + return 0; +} + +AVCodecParser vc1_parser = { + { CODEC_ID_VC1 }, + sizeof(ParseContext1), + NULL, + vc1_parse, + ff_parse1_close, + vc1_split, +}; |