| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "config_components.h" | ||
| 23 | |||
| 24 | #include "avformat.h" | ||
| 25 | #include "internal.h" | ||
| 26 | #include "libavutil/opt.h" | ||
| 27 | |||
| 28 | typedef struct G726Context { | ||
| 29 | AVClass *class; | ||
| 30 | int code_size; | ||
| 31 | int sample_rate; | ||
| 32 | } G726Context; | ||
| 33 | |||
| 34 | ✗ | static int g726_read_header(AVFormatContext *s) | |
| 35 | { | ||
| 36 | ✗ | G726Context *c = s->priv_data; | |
| 37 | ✗ | AVStream *st = avformat_new_stream(s, NULL); | |
| 38 | ✗ | if (!st) | |
| 39 | ✗ | return AVERROR(ENOMEM); | |
| 40 | |||
| 41 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 42 | ✗ | st->codecpar->codec_id = s->iformat->raw_codec_id; | |
| 43 | |||
| 44 | ✗ | st->codecpar->sample_rate = c->sample_rate; | |
| 45 | ✗ | st->codecpar->bits_per_coded_sample = c->code_size; | |
| 46 | ✗ | st->codecpar->bit_rate = ((int[]){ 16000, 24000, 32000, 40000 })[c->code_size - 2]; | |
| 47 | ✗ | st->codecpar->ch_layout.nb_channels = 1; | |
| 48 | |||
| 49 | ✗ | return 0; | |
| 50 | } | ||
| 51 | |||
| 52 | ✗ | static int g726_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 53 | { | ||
| 54 | int res; | ||
| 55 | ✗ | res = av_get_packet(s->pb, pkt, 1020); // a size similar to RAW_PACKET_SIZE divisible by all code_size values | |
| 56 | ✗ | if (res < 0) | |
| 57 | ✗ | return res; | |
| 58 | ✗ | return 0; | |
| 59 | } | ||
| 60 | |||
| 61 | #define OFFSET(x) offsetof(G726Context, x) | ||
| 62 | static const AVOption options[] = { | ||
| 63 | { "code_size", "Bits per G.726 code", | ||
| 64 | OFFSET(code_size), AV_OPT_TYPE_INT, {.i64 = 4}, 2, 5, AV_OPT_FLAG_DECODING_PARAM }, | ||
| 65 | { "sample_rate", "", | ||
| 66 | OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, | ||
| 67 | { NULL }, | ||
| 68 | }; | ||
| 69 | |||
| 70 | static const AVClass g726_demuxer_class = { | ||
| 71 | .class_name = "G.726 demuxer", | ||
| 72 | .item_name = av_default_item_name, | ||
| 73 | .option = options, | ||
| 74 | .version = LIBAVUTIL_VERSION_INT, | ||
| 75 | }; | ||
| 76 | |||
| 77 | #if CONFIG_G726_DEMUXER | ||
| 78 | const AVInputFormat ff_g726_demuxer = { | ||
| 79 | .name = "g726", | ||
| 80 | .long_name = NULL_IF_CONFIG_SMALL("raw big-endian G.726 (\"left aligned\")"), | ||
| 81 | .read_header = g726_read_header, | ||
| 82 | .read_packet = g726_read_packet, | ||
| 83 | .priv_data_size = sizeof(G726Context), | ||
| 84 | .priv_class = &g726_demuxer_class, | ||
| 85 | .raw_codec_id = AV_CODEC_ID_ADPCM_G726, | ||
| 86 | }; | ||
| 87 | #endif | ||
| 88 | |||
| 89 | #if CONFIG_G726LE_DEMUXER | ||
| 90 | const AVInputFormat ff_g726le_demuxer = { | ||
| 91 | .name = "g726le", | ||
| 92 | .long_name = NULL_IF_CONFIG_SMALL("raw little-endian G.726 (\"right aligned\")"), | ||
| 93 | .read_header = g726_read_header, | ||
| 94 | .read_packet = g726_read_packet, | ||
| 95 | .priv_data_size = sizeof(G726Context), | ||
| 96 | .priv_class = &g726_demuxer_class, | ||
| 97 | .raw_codec_id = AV_CODEC_ID_ADPCM_G726LE, | ||
| 98 | }; | ||
| 99 | #endif | ||
| 100 | |||
| 101 |