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| 1 | +/* |
| 2 | + * G.726 raw demuxer |
| 3 | + * Copyright 2017 Carl Eugen Hoyos |
| 4 | + * |
| 5 | + * This file is part of FFmpeg. |
| 6 | + * |
| 7 | + * FFmpeg is free software; you can redistribute it and/or |
| 8 | + * modify it under the terms of the GNU Lesser General Public |
| 9 | + * License as published by the Free Software Foundation; either |
| 10 | + * version 2.1 of the License, or (at your option) any later version. |
| 11 | + * |
| 12 | + * FFmpeg is distributed in the hope that it will be useful, |
| 13 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | + * Lesser General Public License for more details. |
| 16 | + * |
| 17 | + * You should have received a copy of the GNU Lesser General Public |
| 18 | + * License along with FFmpeg; if not, write to the Free Software |
| 19 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | + */ |
| 21 | + |
| 22 | +#include "avformat.h" |
| 23 | +#include "internal.h" |
| 24 | +#include "libavutil/opt.h" |
| 25 | + |
| 26 | +typedef struct G726Context { |
| 27 | + AVClass *class; |
| 28 | + int code_size; |
| 29 | + int sample_rate; |
| 30 | +} G726Context; |
| 31 | + |
| 32 | +static int g726_read_header(AVFormatContext *s) |
| 33 | +{ |
| 34 | + G726Context *c = s->priv_data; |
| 35 | + AVStream *st = avformat_new_stream(s, NULL); |
| 36 | + if (!st) |
| 37 | + return AVERROR(ENOMEM); |
| 38 | + |
| 39 | + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| 40 | + st->codecpar->codec_id = s->iformat->raw_codec_id; |
| 41 | + |
| 42 | + st->codecpar->sample_rate = c->sample_rate; |
| 43 | + st->codecpar->bits_per_coded_sample = c->code_size; |
| 44 | + st->codecpar->bit_rate = ((int[]){ 16000, 24000, 32000, 40000 })[c->code_size - 2]; |
| 45 | + st->codecpar->channels = 1; |
| 46 | + |
| 47 | + return 0; |
| 48 | +} |
| 49 | + |
| 50 | +static int g726_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 51 | +{ |
| 52 | + int res; |
| 53 | + res = av_get_packet(s->pb, pkt, 1020); // a size similar to RAW_PACKET_SIZE divisible by all code_size values |
| 54 | + if (res < 0) |
| 55 | + return res; |
| 56 | + return 0; |
| 57 | +} |
| 58 | + |
| 59 | +#define OFFSET(x) offsetof(G726Context, x) |
| 60 | +static const AVOption options[] = { |
| 61 | + { "code_size", "Bits per G.726 code", |
| 62 | + OFFSET(code_size), AV_OPT_TYPE_INT, {.i64 = 4}, 2, 5, AV_OPT_FLAG_DECODING_PARAM }, |
| 63 | + { "sample_rate", "", |
| 64 | + OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
| 65 | + { NULL }, |
| 66 | +}; |
| 67 | + |
| 68 | +#if CONFIG_G726_DEMUXER |
| 69 | +static const AVClass g726le_demuxer_class = { |
| 70 | + .class_name = "G.726 big-endian demuxer", |
| 71 | + .item_name = av_default_item_name, |
| 72 | + .option = options, |
| 73 | + .version = LIBAVUTIL_VERSION_INT, |
| 74 | +}; |
| 75 | + |
| 76 | +AVInputFormat ff_g726_demuxer = { |
| 77 | + .name = "g726", |
| 78 | + .long_name = NULL_IF_CONFIG_SMALL("raw big-endian G.726 (\"left aligned\")"), |
| 79 | + .read_header = g726_read_header, |
| 80 | + .read_packet = g726_read_packet, |
| 81 | + .priv_data_size = sizeof(G726Context), |
| 82 | + .priv_class = &g726le_demuxer_class, |
| 83 | + .raw_codec_id = AV_CODEC_ID_ADPCM_G726, |
| 84 | +}; |
| 85 | +#endif |
| 86 | + |
| 87 | +#if CONFIG_G726LE_DEMUXER |
| 88 | +static const AVClass g726_demuxer_class = { |
| 89 | + .class_name = "G.726 little-endian demuxer", |
| 90 | + .item_name = av_default_item_name, |
| 91 | + .option = options, |
| 92 | + .version = LIBAVUTIL_VERSION_INT, |
| 93 | +}; |
| 94 | + |
| 95 | +AVInputFormat ff_g726le_demuxer = { |
| 96 | + .name = "g726le", |
| 97 | + .long_name = NULL_IF_CONFIG_SMALL("raw little-endian G.726 (\"right aligned\")"), |
| 98 | + .read_header = g726_read_header, |
| 99 | + .read_packet = g726_read_packet, |
| 100 | + .priv_data_size = sizeof(G726Context), |
| 101 | + .priv_class = &g726_demuxer_class, |
| 102 | + .raw_codec_id = AV_CODEC_ID_ADPCM_G726LE, |
| 103 | +}; |
| 104 | +#endif |
| 105 | + |