avformat/pcmdec: endianness for audio/L16 mime type
[ffmpeg.git] / libavformat / pcmdec.c
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
29 typedef struct PCMAudioDemuxerContext {
30     AVClass *class;
31     int sample_rate;
32     int channels;
33 } PCMAudioDemuxerContext;
34
35 static 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, little_endian = 0;
54         size_t len = strlen(s->iformat->mime_type);
55         if (!av_strncasecmp(s->iformat->mime_type, mime_type, len)) { /* audio/L16 */
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                 if (!little_endian) {
67                      char val[14]; /* sizeof("little-endian") == 14 */
68                      if (sscanf(options, " endianness=%13s", val) == 1) {
69                          little_endian = strcmp(val, "little-endian") == 0;
70                      }
71                 }
72             }
73             if (rate <= 0) {
74                 av_log(s, AV_LOG_ERROR,
75                        "Invalid sample_rate found in mime_type \"%s\"\n",
76                        mime_type);
77                 av_freep(&mime_type);
78                 return AVERROR_INVALIDDATA;
79             }
80             st->codecpar->sample_rate = rate;
81             if (channels > 0)
82                 st->codecpar->channels = channels;
83             if (little_endian)
84                 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
85         }
86     }
87     av_freep(&mime_type);
88
89     st->codecpar->bits_per_coded_sample =
90         av_get_bits_per_sample(st->codecpar->codec_id);
91
92     av_assert0(st->codecpar->bits_per_coded_sample > 0);
93
94     st->codecpar->block_align =
95         st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;
96
97     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
98     return 0;
99 }
100
101 static const AVOption pcm_options[] = {
102     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
103     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
104     { NULL },
105 };
106
107 #define PCMDEF(name_, long_name_, ext, codec, ...)          \
108 static const AVClass name_ ## _demuxer_class = {            \
109     .class_name = #name_ " demuxer",                        \
110     .item_name  = av_default_item_name,                     \
111     .option     = pcm_options,                              \
112     .version    = LIBAVUTIL_VERSION_INT,                    \
113 };                                                          \
114 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
115     .name           = #name_,                               \
116     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
117     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
118     .read_header    = pcm_read_header,                      \
119     .read_packet    = ff_pcm_read_packet,                   \
120     .read_seek      = ff_pcm_read_seek,                     \
121     .flags          = AVFMT_GENERIC_INDEX,                  \
122     .extensions     = ext,                                  \
123     .raw_codec_id   = codec,                                \
124     .priv_class     = &name_ ## _demuxer_class,             \
125     __VA_ARGS__                                             \
126 };
127
128 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
129        NULL, AV_CODEC_ID_PCM_F64BE)
130
131 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
132        NULL, AV_CODEC_ID_PCM_F64LE)
133
134 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
135        NULL, AV_CODEC_ID_PCM_F32BE)
136
137 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
138        NULL, AV_CODEC_ID_PCM_F32LE)
139
140 PCMDEF(s32be, "PCM signed 32-bit big-endian",
141        NULL, AV_CODEC_ID_PCM_S32BE)
142
143 PCMDEF(s32le, "PCM signed 32-bit little-endian",
144        NULL, AV_CODEC_ID_PCM_S32LE)
145
146 PCMDEF(s24be, "PCM signed 24-bit big-endian",
147        NULL, AV_CODEC_ID_PCM_S24BE)
148
149 PCMDEF(s24le, "PCM signed 24-bit little-endian",
150        NULL, AV_CODEC_ID_PCM_S24LE)
151
152 PCMDEF(s16be, "PCM signed 16-bit big-endian",
153        AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE, .mime_type = "audio/L16")
154
155 PCMDEF(s16le, "PCM signed 16-bit little-endian",
156        AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
157
158 PCMDEF(s8, "PCM signed 8-bit",
159        "sb", AV_CODEC_ID_PCM_S8)
160
161 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
162        NULL, AV_CODEC_ID_PCM_U32BE)
163
164 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
165        NULL, AV_CODEC_ID_PCM_U32LE)
166
167 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
168        NULL, AV_CODEC_ID_PCM_U24BE)
169
170 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
171        NULL, AV_CODEC_ID_PCM_U24LE)
172
173 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
174        AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
175
176 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
177        AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
178
179 PCMDEF(u8, "PCM unsigned 8-bit",
180        "ub", AV_CODEC_ID_PCM_U8)
181
182 PCMDEF(alaw, "PCM A-law",
183        "al", AV_CODEC_ID_PCM_ALAW)
184
185 PCMDEF(mulaw, "PCM mu-law",
186        "ul", AV_CODEC_ID_PCM_MULAW)
187
188 PCMDEF(vidc, "PCM Archimedes VIDC",
189        NULL, AV_CODEC_ID_PCM_VIDC)
190
191 static const AVOption sln_options[] = {
192     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
193     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
194     { NULL },
195 };
196
197 static const AVClass sln_demuxer_class = {
198     .class_name = "sln demuxer",
199     .item_name  = av_default_item_name,
200     .option     = sln_options,
201     .version    = LIBAVUTIL_VERSION_INT,
202 };
203
204 AVInputFormat ff_sln_demuxer = {
205     .name           = "sln",
206     .long_name      = NULL_IF_CONFIG_SMALL("Asterisk raw pcm"),
207     .priv_data_size = sizeof(PCMAudioDemuxerContext),
208     .read_header    = pcm_read_header,
209     .read_packet    = ff_pcm_read_packet,
210     .read_seek      = ff_pcm_read_seek,
211     .flags          = AVFMT_GENERIC_INDEX,
212     .extensions     = "sln",
213     .raw_codec_id   = AV_CODEC_ID_PCM_S16LE,
214     .priv_class     = &sln_demuxer_class,
215 };