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