97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
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/*
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* Copyright (c) 2011 Justin Ruggles
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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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* ADX audio parser
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*
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* Splits packets into individual blocks.
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*/
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#include "libavutil/intreadwrite.h"
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#include "parser.h"
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#include "adx.h"
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typedef struct ADXParseContext {
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ParseContext pc;
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int header_size;
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int block_size;
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int remaining;
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} ADXParseContext;
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static int adx_parse(AVCodecParserContext *s1,
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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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ADXParseContext *s = s1->priv_data;
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ParseContext *pc = &s->pc;
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int next = END_NOT_FOUND;
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int i;
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uint64_t state = pc->state64;
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if (!s->header_size) {
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for (i = 0; i < buf_size; i++) {
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state = (state << 8) | buf[i];
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/* check for fixed fields in ADX header for possible match */
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if ((state & 0xFFFF0000FFFFFF00) == 0x8000000003120400ULL) {
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int channels = state & 0xFF;
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int header_size = ((state >> 32) & 0xFFFF) + 4;
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if (channels > 0 && header_size >= 8) {
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s->header_size = header_size;
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s->block_size = BLOCK_SIZE * channels;
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s->remaining = i - 7 + s->header_size + s->block_size;
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break;
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}
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}
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}
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pc->state64 = state;
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}
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if (s->header_size) {
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if (!s->remaining)
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s->remaining = s->block_size;
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if (s->remaining <= buf_size) {
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next = s->remaining;
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s->remaining = 0;
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} else
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s->remaining -= buf_size;
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}
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
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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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s1->duration = BLOCK_SAMPLES;
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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_adx_parser = {
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.codec_ids = { AV_CODEC_ID_ADPCM_ADX },
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.priv_data_size = sizeof(ADXParseContext),
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.parser_parse = adx_parse,
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.parser_close = ff_parse_close,
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};
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