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105 lines
3.4 KiB
105 lines
3.4 KiB
/* |
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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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