mirror of https://git.ffmpeg.org/ffmpeg.git
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
|
/*
|
||
|
|
* G.726 raw demuxer
|
||
|
|
* Copyright 2017 Carl Eugen Hoyos
|
||
|
|
*
|
||
|
|
* 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
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "internal.h"
|
||
|
|
#include "libavutil/opt.h"
|
||
|
|
|
||
|
|
typedef struct G726Context {
|
||
|
|
AVClass *class;
|
||
|
|
int code_size;
|
||
|
|
int sample_rate;
|
||
|
|
} G726Context;
|
||
|
|
|
||
|
|
static int g726_read_header(AVFormatContext *s)
|
||
|
|
{
|
||
|
|
G726Context *c = s->priv_data;
|
||
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
||
|
|
if (!st)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
||
|
|
st->codecpar->codec_id = s->iformat->raw_codec_id;
|
||
|
|
|
||
|
|
st->codecpar->sample_rate = c->sample_rate;
|
||
|
|
st->codecpar->bits_per_coded_sample = c->code_size;
|
||
|
|
st->codecpar->bit_rate = ((int[]){ 16000, 24000, 32000, 40000 })[c->code_size - 2];
|
||
|
|
st->codecpar->channels = 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int g726_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
res = av_get_packet(s->pb, pkt, 1020); // a size similar to RAW_PACKET_SIZE divisible by all code_size values
|
||
|
|
if (res < 0)
|
||
|
|
return res;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define OFFSET(x) offsetof(G726Context, x)
|
||
|
|
static const AVOption options[] = {
|
||
|
|
{ "code_size", "Bits per G.726 code",
|
||
|
|
OFFSET(code_size), AV_OPT_TYPE_INT, {.i64 = 4}, 2, 5, AV_OPT_FLAG_DECODING_PARAM },
|
||
|
|
{ "sample_rate", "",
|
||
|
|
OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
|
||
|
|
{ NULL },
|
||
|
|
};
|
||
|
|
|
||
|
|
#if CONFIG_G726_DEMUXER
|
||
|
|
static const AVClass g726le_demuxer_class = {
|
||
|
|
.class_name = "G.726 big-endian demuxer",
|
||
|
|
.item_name = av_default_item_name,
|
||
|
|
.option = options,
|
||
|
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
|
};
|
||
|
|
|
||
|
|
AVInputFormat ff_g726_demuxer = {
|
||
|
|
.name = "g726",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("raw big-endian G.726 (\"left aligned\")"),
|
||
|
|
.read_header = g726_read_header,
|
||
|
|
.read_packet = g726_read_packet,
|
||
|
|
.priv_data_size = sizeof(G726Context),
|
||
|
|
.priv_class = &g726le_demuxer_class,
|
||
|
|
.raw_codec_id = AV_CODEC_ID_ADPCM_G726,
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if CONFIG_G726LE_DEMUXER
|
||
|
|
static const AVClass g726_demuxer_class = {
|
||
|
|
.class_name = "G.726 little-endian demuxer",
|
||
|
|
.item_name = av_default_item_name,
|
||
|
|
.option = options,
|
||
|
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
|
};
|
||
|
|
|
||
|
|
AVInputFormat ff_g726le_demuxer = {
|
||
|
|
.name = "g726le",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("raw little-endian G.726 (\"right aligned\")"),
|
||
|
|
.read_header = g726_read_header,
|
||
|
|
.read_packet = g726_read_packet,
|
||
|
|
.priv_data_size = sizeof(G726Context),
|
||
|
|
.priv_class = &g726_demuxer_class,
|
||
|
|
.raw_codec_id = AV_CODEC_ID_ADPCM_G726LE,
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
|