mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
3.4 KiB
105 lines
3.4 KiB
/* |
|
* 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, |
|
}; |
|
|
|
const 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, |
|
}; |
|
|
|
const 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 |
|
|
|
|