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 "libavutil/avstring.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "pcm.h"
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
29
30 typedef struct PCMAudioDemuxerContext {
31 AVClass *class;
32 int sample_rate;
33 int channels;
34 } PCMAudioDemuxerContext;
35
pcm_read_header(AVFormatContext * s)36 static int pcm_read_header(AVFormatContext *s)
37 {
38 PCMAudioDemuxerContext *s1 = s->priv_data;
39 AVCodecParameters *par;
40 AVStream *st;
41 uint8_t *mime_type = NULL;
42
43 st = avformat_new_stream(s, NULL);
44 if (!st)
45 return AVERROR(ENOMEM);
46 par = st->codecpar;
47
48 par->codec_type = AVMEDIA_TYPE_AUDIO;
49 par->codec_id = s->iformat->raw_codec_id;
50 par->sample_rate = s1->sample_rate;
51 par->channels = s1->channels;
52
53 av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
54 if (mime_type && s->iformat->mime_type) {
55 int rate = 0, channels = 0, little_endian = 0;
56 const char *options;
57 if (av_stristart(mime_type, s->iformat->mime_type, &options)) { /* audio/L16 */
58 while (options = strchr(options, ';')) {
59 options++;
60 if (!rate)
61 sscanf(options, " rate=%d", &rate);
62 if (!channels)
63 sscanf(options, " channels=%d", &channels);
64 if (!little_endian) {
65 char val[sizeof("little-endian")];
66 if (sscanf(options, " endianness=%13s", val) == 1) {
67 little_endian = strcmp(val, "little-endian") == 0;
68 }
69 }
70 }
71 if (rate <= 0) {
72 av_log(s, AV_LOG_ERROR,
73 "Invalid sample_rate found in mime_type \"%s\"\n",
74 mime_type);
75 av_freep(&mime_type);
76 return AVERROR_INVALIDDATA;
77 }
78 par->sample_rate = rate;
79 if (channels > 0)
80 par->channels = channels;
81 if (little_endian)
82 par->codec_id = AV_CODEC_ID_PCM_S16LE;
83 }
84 }
85 av_freep(&mime_type);
86
87 par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
88
89 av_assert0(par->bits_per_coded_sample > 0);
90
91 par->block_align = par->bits_per_coded_sample * par->channels / 8;
92
93 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
94 return 0;
95 }
96
97 static const AVOption pcm_options[] = {
98 { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
99 { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
100 { NULL },
101 };
102
103 #define PCMDEF_0(name_, long_name_, ext, codec, ...)
104 #define PCMDEF_1(name_, long_name_, ext, codec, ...) \
105 static const AVClass name_ ## _demuxer_class = { \
106 .class_name = #name_ " demuxer", \
107 .item_name = av_default_item_name, \
108 .option = pcm_options, \
109 .version = LIBAVUTIL_VERSION_INT, \
110 }; \
111 AVInputFormat ff_pcm_ ## name_ ## _demuxer = { \
112 .name = #name_, \
113 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
114 .priv_data_size = sizeof(PCMAudioDemuxerContext), \
115 .read_header = pcm_read_header, \
116 .read_packet = ff_pcm_read_packet, \
117 .read_seek = ff_pcm_read_seek, \
118 .flags = AVFMT_GENERIC_INDEX, \
119 .extensions = ext, \
120 .raw_codec_id = codec, \
121 .priv_class = &name_ ## _demuxer_class, \
122 __VA_ARGS__ \
123 };
124 #define PCMDEF_2(name, long_name, ext, codec, enabled, ...) \
125 PCMDEF_ ## enabled(name, long_name, ext, codec, __VA_ARGS__)
126 #define PCMDEF_3(name, long_name, ext, codec, config, ...) \
127 PCMDEF_2(name, long_name, ext, codec, config, __VA_ARGS__)
128 #define PCMDEF_EXT(name, long_name, ext, uppercase, ...) \
129 PCMDEF_3(name, long_name, ext, AV_CODEC_ID_PCM_ ## uppercase, \
130 CONFIG_PCM_ ## uppercase ## _DEMUXER, __VA_ARGS__)
131 #define PCMDEF(name, long_name, ext, uppercase) \
132 PCMDEF_EXT(name, long_name, ext, uppercase, )
133
134 PCMDEF(f64be, "PCM 64-bit floating-point big-endian", NULL, F64BE)
135 PCMDEF(f64le, "PCM 64-bit floating-point little-endian", NULL, F64LE)
136 PCMDEF(f32be, "PCM 32-bit floating-point big-endian", NULL, F32BE)
137 PCMDEF(f32le, "PCM 32-bit floating-point little-endian", NULL, F32LE)
138 PCMDEF(s32be, "PCM signed 32-bit big-endian", NULL, S32BE)
139 PCMDEF(s32le, "PCM signed 32-bit little-endian", NULL, S32LE)
140 PCMDEF(s24be, "PCM signed 24-bit big-endian", NULL, S24BE)
141 PCMDEF(s24le, "PCM signed 24-bit little-endian", NULL, S24LE)
142 PCMDEF_EXT(s16be, "PCM signed 16-bit big-endian",
143 AV_NE("sw", NULL), S16BE, .mime_type = "audio/L16")
144 PCMDEF(s16le, "PCM signed 16-bit little-endian", AV_NE(NULL, "sw"), S16LE)
145 PCMDEF(s8, "PCM signed 8-bit", "sb", S8)
146 PCMDEF(u32be, "PCM unsigned 32-bit big-endian", NULL, U32BE)
147 PCMDEF(u32le, "PCM unsigned 32-bit little-endian", NULL, U32LE)
148 PCMDEF(u24be, "PCM unsigned 24-bit big-endian", NULL, U24BE)
149 PCMDEF(u24le, "PCM unsigned 24-bit little-endian", NULL, U24LE)
150 PCMDEF(u16be, "PCM unsigned 16-bit big-endian", AV_NE("uw", NULL), U16BE)
151 PCMDEF(u16le, "PCM unsigned 16-bit little-endian", AV_NE(NULL, "uw"), U16LE)
152 PCMDEF(u8, "PCM unsigned 8-bit", "ub", U8)
153 PCMDEF(alaw, "PCM A-law", "al", ALAW)
154 PCMDEF(mulaw, "PCM mu-law", "ul", MULAW)
155 PCMDEF(vidc, "PCM Archimedes VIDC", NULL, VIDC)
156
157 #if CONFIG_SLN_DEMUXER
158 static const AVOption sln_options[] = {
159 { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
160 { "channels", "", offsetof(PCMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
161 { NULL },
162 };
163
164 static const AVClass sln_demuxer_class = {
165 .class_name = "sln demuxer",
166 .item_name = av_default_item_name,
167 .option = sln_options,
168 .version = LIBAVUTIL_VERSION_INT,
169 };
170
171 AVInputFormat ff_sln_demuxer = {
172 .name = "sln",
173 .long_name = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
174 .priv_data_size = sizeof(PCMAudioDemuxerContext),
175 .read_header = pcm_read_header,
176 .read_packet = ff_pcm_read_packet,
177 .read_seek = ff_pcm_read_seek,
178 .flags = AVFMT_GENERIC_INDEX,
179 .extensions = "sln",
180 .raw_codec_id = AV_CODEC_ID_PCM_S16LE,
181 .priv_class = &sln_demuxer_class,
182 };
183 #endif
184