107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2011 Justin Ruggles
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* ADX audio parser
|
|
*
|
|
* Splits packets into individual blocks.
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "parser.h"
|
|
#include "adx.h"
|
|
|
|
typedef struct ADXParseContext {
|
|
ParseContext pc;
|
|
int header_size;
|
|
int block_size;
|
|
int remaining;
|
|
} ADXParseContext;
|
|
|
|
static int adx_parse(AVCodecParserContext *s1,
|
|
AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
ADXParseContext *s = s1->priv_data;
|
|
ParseContext *pc = &s->pc;
|
|
int next = END_NOT_FOUND;
|
|
int i;
|
|
uint64_t state = pc->state64;
|
|
|
|
if (!s->header_size) {
|
|
for (i = 0; i < buf_size; i++) {
|
|
state = (state << 8) | buf[i];
|
|
/* check for fixed fields in ADX header for possible match */
|
|
if ((state & 0xFFFF0000FFFFFF00) == 0x8000000003120400ULL) {
|
|
int channels = state & 0xFF;
|
|
int header_size = ((state >> 32) & 0xFFFF) + 4;
|
|
if (channels > 0 && header_size >= 8) {
|
|
s->header_size = header_size;
|
|
s->block_size = BLOCK_SIZE * channels;
|
|
s->remaining = i - 7 + s->header_size + s->block_size;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
pc->state64 = state;
|
|
}
|
|
|
|
if (s->header_size) {
|
|
if (!s->remaining)
|
|
s->remaining = s->block_size;
|
|
if (s->remaining <= buf_size) {
|
|
next = s->remaining;
|
|
s->remaining = 0;
|
|
} else
|
|
s->remaining -= buf_size;
|
|
} else if (avctx->ch_layout.nb_channels > 0) {
|
|
if (!s->block_size)
|
|
s->block_size = avctx->ch_layout.nb_channels * BLOCK_SIZE;
|
|
if (!s->remaining)
|
|
s->remaining = s->block_size;
|
|
if (s->remaining <= buf_size) {
|
|
next = s->remaining;
|
|
s->remaining = 0;
|
|
} else
|
|
s->remaining -= buf_size;
|
|
}
|
|
|
|
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
s1->duration = BLOCK_SAMPLES;
|
|
|
|
*poutbuf = buf;
|
|
*poutbuf_size = buf_size;
|
|
return next;
|
|
}
|
|
|
|
const AVCodecParser ff_adx_parser = {
|
|
.codec_ids = { AV_CODEC_ID_ADPCM_ADX },
|
|
.priv_data_size = sizeof(ADXParseContext),
|
|
.parser_parse = adx_parse,
|
|
.parser_close = ff_parse_close,
|
|
};
|