| /* |
| * 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 |
| |