mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
9d2dd356c2
It is used by the ADX decoder, and therefore needs to be exported in order to work with shared libs.
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2011 Justin Ruggles
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* ADX audio parser
|
|
*
|
|
* Reads header to extradata and 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 buf_pos;
|
|
} ADXParseContext;
|
|
|
|
#define MIN_HEADER_SIZE 24
|
|
|
|
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;
|
|
|
|
if (!avctx->extradata_size) {
|
|
int ret;
|
|
|
|
ff_combine_frame(pc, END_NOT_FOUND, &buf, &buf_size);
|
|
|
|
if (!s->header_size && pc->index >= MIN_HEADER_SIZE) {
|
|
if (ret = avpriv_adx_decode_header(avctx, pc->buffer, pc->index,
|
|
&s->header_size, NULL))
|
|
return AVERROR_INVALIDDATA;
|
|
s->block_size = BLOCK_SIZE * avctx->channels;
|
|
}
|
|
if (s->header_size && s->header_size <= pc->index) {
|
|
avctx->extradata = av_mallocz(s->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!avctx->extradata)
|
|
return AVERROR(ENOMEM);
|
|
avctx->extradata_size = s->header_size;
|
|
memcpy(avctx->extradata, pc->buffer, s->header_size);
|
|
memmove(pc->buffer, pc->buffer + s->header_size, s->header_size);
|
|
pc->index -= s->header_size;
|
|
}
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
if (pc->index - s->buf_pos >= s->block_size) {
|
|
*poutbuf = &pc->buffer[s->buf_pos];
|
|
*poutbuf_size = s->block_size;
|
|
s->buf_pos += s->block_size;
|
|
return 0;
|
|
}
|
|
if (pc->index && s->buf_pos) {
|
|
memmove(pc->buffer, &pc->buffer[s->buf_pos], pc->index - s->buf_pos);
|
|
pc->index -= s->buf_pos;
|
|
s->buf_pos = 0;
|
|
}
|
|
if (buf_size + pc->index >= s->block_size)
|
|
next = s->block_size - pc->index;
|
|
|
|
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
*poutbuf = buf;
|
|
*poutbuf_size = buf_size;
|
|
return next;
|
|
}
|
|
|
|
AVCodecParser ff_adx_parser = {
|
|
.codec_ids = { CODEC_ID_ADPCM_ADX },
|
|
.priv_data_size = sizeof(ADXParseContext),
|
|
.parser_parse = adx_parse,
|
|
.parser_close = ff_parse_close,
|
|
};
|