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75 lines
2.1 KiB
75 lines
2.1 KiB
8 years ago
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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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* Sipr audio parser
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*/
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#include "parser.h"
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typedef struct SiprParserContext{
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ParseContext pc;
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} SiprParserContext;
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static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
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{
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int next;
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switch (avctx->block_align) {
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case 20:
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case 19:
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case 29:
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case 37: next = avctx->block_align; break;
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default:
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if (avctx->bit_rate > 12200) next = 20;
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else if (avctx->bit_rate > 7500 ) next = 19;
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else if (avctx->bit_rate > 5750 ) next = 29;
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else next = 37;
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}
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return FFMIN(next, buf_size);
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}
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static int sipr_parse(AVCodecParserContext *s1, 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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SiprParserContext *s = s1->priv_data;
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ParseContext *pc = &s->pc;
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int next;
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next = sipr_split(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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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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AVCodecParser ff_sipr_parser = {
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.codec_ids = { AV_CODEC_ID_SIPR },
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.priv_data_size = sizeof(SiprParserContext),
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.parser_parse = sipr_parse,
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.parser_close = ff_parse_close,
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};
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