82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* Micronas SC-4 parser
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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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#include "parser.h"
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typedef struct MISC4Context {
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ParseContext pc;
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} MISC4Context;
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static int misc4_parse(AVCodecParserContext *s, 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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MISC4Context *ctx = s->priv_data;
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uint32_t state = ctx->pc.state;
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int next = END_NOT_FOUND, i = 0;
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*poutbuf_size = 0;
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*poutbuf = NULL;
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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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uint32_t marker = 0;
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switch (avctx->sample_rate) {
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case 8000:
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case 11025:
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marker = 0x11b;
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break;
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case 16000:
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case 32000:
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marker = 0x2b2;
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break;
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}
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for (; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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if (state == marker && i > 3) {
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next = i - 3;
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break;
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}
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}
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ctx->pc.state = state;
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if (ff_combine_frame(&ctx->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_misc4_parser = {
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.codec_ids = { AV_CODEC_ID_MISC4 },
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.priv_data_size = sizeof(MISC4Context),
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.parser_parse = misc4_parse,
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.parser_close = ff_parse_close,
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};
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