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/* |
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* H.263 parser |
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
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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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/** |
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* @file |
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* H.263 parser |
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*/ |
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#include "parser.h" |
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#if FF_API_FLAG_TRUNCATED |
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/* Nuke this header when removing FF_API_FLAG_TRUNCATED */ |
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#include "h263_parser.h" |
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int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){ |
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#else |
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static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) |
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{ |
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#endif |
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int vop_found, i; |
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uint32_t state; |
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vop_found= pc->frame_start_found; |
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state= pc->state; |
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i=0; |
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if(!vop_found){ |
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for(i=0; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if(state>>(32-22) == 0x20){ |
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i++; |
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vop_found=1; |
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break; |
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} |
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} |
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} |
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if(vop_found){ |
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for(; i<buf_size; i++){ |
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state= (state<<8) | buf[i]; |
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if(state>>(32-22) == 0x20){ |
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pc->frame_start_found=0; |
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pc->state=-1; |
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return i-3; |
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} |
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} |
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} |
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pc->frame_start_found= vop_found; |
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pc->state= state; |
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return END_NOT_FOUND; |
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} |
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static int h263_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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const 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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#if FF_API_FLAG_TRUNCATED |
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next= ff_h263_find_frame_end(pc, buf, buf_size); |
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#else |
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next = h263_find_frame_end(pc, buf, buf_size); |
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#endif |
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if (ff_combine_frame(pc, next, &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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*poutbuf = buf; |
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*poutbuf_size = buf_size; |
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return next; |
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} |
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const AVCodecParser ff_h263_parser = { |
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.codec_ids = { AV_CODEC_ID_H263 }, |
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.priv_data_size = sizeof(ParseContext), |
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.parser_parse = h263_parse, |
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.parser_close = ff_parse_close, |
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}; |
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