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Add Dirac parser from SoC; written by Marco Gerards;
submitted by Anuradha Suraparaju, anuradha rd.bbc.co uk Originally committed as revision 13041 to svn://svn.ffmpeg.org/ffmpeg/trunk
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/* | ||
* Dirac parser | ||
* | ||
* Copyright (c) 2007 Marco Gerards <marco@gnu.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 Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
*/ | ||
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/** | ||
* @file dirac_parser.c | ||
* Dirac Parser | ||
* @author Marco Gerards <marco@gnu.org> | ||
*/ | ||
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#include "parser.h" | ||
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#define DIRAC_PARSE_INFO_PREFIX 0x42424344 | ||
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/** | ||
* 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 find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) | ||
{ | ||
uint32_t state = pc->state; | ||
int i; | ||
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for (i = 0; i < buf_size; i++) { | ||
state = (state << 8) | buf[i]; | ||
if (state == DIRAC_PARSE_INFO_PREFIX) { | ||
pc->frame_start_found ^= 1; | ||
if (!pc->frame_start_found) { | ||
pc->state = -1; | ||
return i - 3; | ||
} | ||
} | ||
} | ||
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pc->state = state; | ||
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return END_NOT_FOUND; | ||
} | ||
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static int dirac_parse(AVCodecParserContext *s, AVCodecContext *avctx, | ||
const uint8_t **poutbuf, int *poutbuf_size, | ||
const uint8_t *buf, int buf_size) | ||
{ | ||
ParseContext *pc = s->priv_data; | ||
int next; | ||
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if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { | ||
next = buf_size; | ||
}else{ | ||
next = find_frame_end(pc, buf, buf_size); | ||
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { | ||
*poutbuf = NULL; | ||
*poutbuf_size = 0; | ||
return buf_size; | ||
} | ||
} | ||
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*poutbuf = buf; | ||
*poutbuf_size = buf_size; | ||
return next; | ||
} | ||
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AVCodecParser dirac_parser = { | ||
{ CODEC_ID_DIRAC }, | ||
sizeof(ParseContext), | ||
NULL, | ||
dirac_parse, | ||
ff_parse_close, | ||
}; |