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path: root/libavformat/pcmdec.c (plain)
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1/*
2 * RAW PCM demuxers
3 * Copyright (c) 2002 Fabrice Bellard
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 "pcm.h"
25#include "libavutil/log.h"
26#include "libavutil/opt.h"
27#include "libavutil/avassert.h"
28
29typedef struct PCMAudioDemuxerContext {
30 AVClass *class;
31 int sample_rate;
32 int channels;
33} PCMAudioDemuxerContext;
34
35static int pcm_read_header(AVFormatContext *s)
36{
37 PCMAudioDemuxerContext *s1 = s->priv_data;
38 AVStream *st;
39 uint8_t *mime_type = NULL;
40
41 st = avformat_new_stream(s, NULL);
42 if (!st)
43 return AVERROR(ENOMEM);
44
45
46 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
47 st->codecpar->codec_id = s->iformat->raw_codec_id;
48 st->codecpar->sample_rate = s1->sample_rate;
49 st->codecpar->channels = s1->channels;
50
51 av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
52 if (mime_type && s->iformat->mime_type) {
53 int rate = 0, channels = 0;
54 size_t len = strlen(s->iformat->mime_type);
55 if (!strncmp(s->iformat->mime_type, mime_type, len)) {
56 uint8_t *options = mime_type + len;
57 len = strlen(mime_type);
58 while (options < mime_type + len) {
59 options = strstr(options, ";");
60 if (!options++)
61 break;
62 if (!rate)
63 sscanf(options, " rate=%d", &rate);
64 if (!channels)
65 sscanf(options, " channels=%d", &channels);
66 }
67 if (rate <= 0) {
68 av_log(s, AV_LOG_ERROR,
69 "Invalid sample_rate found in mime_type \"%s\"\n",
70 mime_type);
71 return AVERROR_INVALIDDATA;
72 }
73 st->codecpar->sample_rate = rate;
74 if (channels > 0)
75 st->codecpar->channels = channels;
76 }
77 }
78
79 st->codecpar->bits_per_coded_sample =
80 av_get_bits_per_sample(st->codecpar->codec_id);
81
82 av_assert0(st->codecpar->bits_per_coded_sample > 0);
83
84 st->codecpar->block_align =
85 st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;
86
87 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
88 return 0;
89}
90
91static const AVOption pcm_options[] = {
92 { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
93 { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
94 { NULL },
95};
96
97#define PCMDEF(name_, long_name_, ext, codec, ...) \
98static const AVClass name_ ## _demuxer_class = { \
99 .class_name = #name_ " demuxer", \
100 .item_name = av_default_item_name, \
101 .option = pcm_options, \
102 .version = LIBAVUTIL_VERSION_INT, \
103}; \
104AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
105 .name = #name_, \
106 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
107 .priv_data_size = sizeof(PCMAudioDemuxerContext), \
108 .read_header = pcm_read_header, \
109 .read_packet = ff_pcm_read_packet, \
110 .read_seek = ff_pcm_read_seek, \
111 .flags = AVFMT_GENERIC_INDEX, \
112 .extensions = ext, \
113 .raw_codec_id = codec, \
114 .priv_class = &name_ ## _demuxer_class, \
115 __VA_ARGS__ \
116};
117
118PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
119 NULL, AV_CODEC_ID_PCM_F64BE)
120
121PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
122 NULL, AV_CODEC_ID_PCM_F64LE)
123
124PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
125 NULL, AV_CODEC_ID_PCM_F32BE)
126
127PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
128 NULL, AV_CODEC_ID_PCM_F32LE)
129
130PCMDEF(s32be, "PCM signed 32-bit big-endian",
131 NULL, AV_CODEC_ID_PCM_S32BE)
132
133PCMDEF(s32le, "PCM signed 32-bit little-endian",
134 NULL, AV_CODEC_ID_PCM_S32LE)
135
136PCMDEF(s24be, "PCM signed 24-bit big-endian",
137 NULL, AV_CODEC_ID_PCM_S24BE)
138
139PCMDEF(s24le, "PCM signed 24-bit little-endian",
140 NULL, AV_CODEC_ID_PCM_S24LE)
141
142PCMDEF(s16be, "PCM signed 16-bit big-endian",
143 AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
144
145PCMDEF(s16le, "PCM signed 16-bit little-endian",
146 AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE, .mime_type = "audio/L16",)
147
148PCMDEF(s8, "PCM signed 8-bit",
149 "sb", AV_CODEC_ID_PCM_S8)
150
151PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
152 NULL, AV_CODEC_ID_PCM_U32BE)
153
154PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
155 NULL, AV_CODEC_ID_PCM_U32LE)
156
157PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
158 NULL, AV_CODEC_ID_PCM_U24BE)
159
160PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
161 NULL, AV_CODEC_ID_PCM_U24LE)
162
163PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
164 AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
165
166PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
167 AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
168
169PCMDEF(u8, "PCM unsigned 8-bit",
170 "ub", AV_CODEC_ID_PCM_U8)
171
172PCMDEF(alaw, "PCM A-law",
173 "al", AV_CODEC_ID_PCM_ALAW)
174
175PCMDEF(mulaw, "PCM mu-law",
176 "ul", AV_CODEC_ID_PCM_MULAW)
177
178static const AVOption sln_options[] = {
179 { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
180 { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
181 { NULL },
182};
183
184static const AVClass sln_demuxer_class = {
185 .class_name = "sln demuxer",
186 .item_name = av_default_item_name,
187 .option = sln_options,
188 .version = LIBAVUTIL_VERSION_INT,
189};
190
191AVInputFormat ff_sln_demuxer = {
192 .name = "sln",
193 .long_name = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
194 .priv_data_size = sizeof(PCMAudioDemuxerContext),
195 .read_header = pcm_read_header,
196 .read_packet = ff_pcm_read_packet,
197 .read_seek = ff_pcm_read_seek,
198 .flags = AVFMT_GENERIC_INDEX,
199 .extensions = "sln",
200 .raw_codec_id = AV_CODEC_ID_PCM_S16LE,
201 .priv_class = &sln_demuxer_class,
202};
203
generated by cgit at 2024-05-17 03:08:37 (GMT)