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/* |
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* H.261 parser |
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
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* Copyright (c) 2004 Maarten Daniels |
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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.261 parser |
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*/ |
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#include "parser.h" |
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static int h261_find_frame_end(ParseContext *pc, AVCodecContext *avctx, |
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const uint8_t *buf, int buf_size) |
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{ |
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int vop_found, i, j; |
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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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for (i = 0; i < buf_size && !vop_found; i++) { |
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state = (state << 8) | buf[i]; |
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for (j = 0; j < 8; j++) { |
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if (((state >> j) & 0xFFFFF0) == 0x000100) { |
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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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for (j = 0; j < 8; j++) { |
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if (((state >> j) & 0xFFFFF0) == 0x000100) { |
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pc->frame_start_found = 0; |
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pc->state = (state >> (3 * 8)) + 0xFF00; |
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return i - 2; |
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} |
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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 h261_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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next = h261_find_frame_end(pc, avctx, buf, buf_size); |
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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_h261_parser = { |
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.codec_ids = { AV_CODEC_ID_H261 }, |
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.priv_data_size = sizeof(ParseContext), |
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.parser_parse = h261_parse, |
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.parser_close = ff_parse_close, |
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}; |
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