8svx: decode directly to the user-provided AVFrame
[ffmpeg.git] / libavformat / pcmdec.c
1 /*
2  * RAW PCM demuxers
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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
28 #define RAW_SAMPLES     1024
29
30 typedef struct PCMAudioDemuxerContext {
31     AVClass *class;
32     int sample_rate;
33     int channels;
34 } PCMAudioDemuxerContext;
35
36 static int pcm_read_header(AVFormatContext *s)
37 {
38     PCMAudioDemuxerContext *s1 = s->priv_data;
39     AVStream *st;
40
41     st = avformat_new_stream(s, NULL);
42     if (!st)
43         return AVERROR(ENOMEM);
44
45
46     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
47     st->codec->codec_id    = s->iformat->raw_codec_id;
48     st->codec->sample_rate = s1->sample_rate;
49     st->codec->channels    = s1->channels;
50
51     st->codec->bits_per_coded_sample =
52         av_get_bits_per_sample(st->codec->codec_id);
53
54     assert(st->codec->bits_per_coded_sample > 0);
55
56     st->codec->block_align =
57         st->codec->bits_per_coded_sample * st->codec->channels / 8;
58
59     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
60     return 0;
61 }
62
63 static int pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
64 {
65     int ret, size, bps;
66     //    AVStream *st = s->streams[0];
67
68     size= RAW_SAMPLES*s->streams[0]->codec->block_align;
69
70     ret= av_get_packet(s->pb, pkt, size);
71
72     pkt->stream_index = 0;
73     if (ret < 0)
74         return ret;
75
76     bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id);
77     assert(bps); // if false there IS a bug elsewhere (NOT in this function)
78     pkt->dts=
79     pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels);
80
81     return ret;
82 }
83
84 static const AVOption pcm_options[] = {
85     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
86     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
87     { NULL },
88 };
89
90 #define PCMDEF(name_, long_name_, ext, codec)               \
91 static const AVClass name_ ## _demuxer_class = {            \
92     .class_name = #name_ " demuxer",                        \
93     .item_name  = av_default_item_name,                     \
94     .option     = pcm_options,                              \
95     .version    = LIBAVUTIL_VERSION_INT,                    \
96 };                                                          \
97 AVInputFormat ff_pcm_ ## name_ ## _demuxer = {              \
98     .name           = #name_,                               \
99     .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
100     .priv_data_size = sizeof(PCMAudioDemuxerContext),       \
101     .read_header    = pcm_read_header,                      \
102     .read_packet    = pcm_read_packet,                      \
103     .read_seek      = ff_pcm_read_seek,                     \
104     .flags          = AVFMT_GENERIC_INDEX,                  \
105     .extensions     = ext,                                  \
106     .raw_codec_id   = codec,                                \
107     .priv_class     = &name_ ## _demuxer_class,             \
108 };
109
110 PCMDEF(f64be, "PCM 64-bit floating-point big-endian",
111        NULL, AV_CODEC_ID_PCM_F64BE)
112
113 PCMDEF(f64le, "PCM 64-bit floating-point little-endian",
114        NULL, AV_CODEC_ID_PCM_F64LE)
115
116 PCMDEF(f32be, "PCM 32-bit floating-point big-endian",
117        NULL, AV_CODEC_ID_PCM_F32BE)
118
119 PCMDEF(f32le, "PCM 32-bit floating-point little-endian",
120        NULL, AV_CODEC_ID_PCM_F32LE)
121
122 PCMDEF(s32be, "PCM signed 32-bit big-endian",
123        NULL, AV_CODEC_ID_PCM_S32BE)
124
125 PCMDEF(s32le, "PCM signed 32-bit little-endian",
126        NULL, AV_CODEC_ID_PCM_S32LE)
127
128 PCMDEF(s24be, "PCM signed 24-bit big-endian",
129        NULL, AV_CODEC_ID_PCM_S24BE)
130
131 PCMDEF(s24le, "PCM signed 24-bit little-endian",
132        NULL, AV_CODEC_ID_PCM_S24LE)
133
134 PCMDEF(s16be, "PCM signed 16-bit big-endian",
135        AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
136
137 PCMDEF(s16le, "PCM signed 16-bit little-endian",
138        AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
139
140 PCMDEF(s8, "PCM signed 8-bit",
141        "sb", AV_CODEC_ID_PCM_S8)
142
143 PCMDEF(u32be, "PCM unsigned 32-bit big-endian",
144        NULL, AV_CODEC_ID_PCM_U32BE)
145
146 PCMDEF(u32le, "PCM unsigned 32-bit little-endian",
147        NULL, AV_CODEC_ID_PCM_U32LE)
148
149 PCMDEF(u24be, "PCM unsigned 24-bit big-endian",
150        NULL, AV_CODEC_ID_PCM_U24BE)
151
152 PCMDEF(u24le, "PCM unsigned 24-bit little-endian",
153        NULL, AV_CODEC_ID_PCM_U24LE)
154
155 PCMDEF(u16be, "PCM unsigned 16-bit big-endian",
156        AV_NE("uw", NULL), AV_CODEC_ID_PCM_U16BE)
157
158 PCMDEF(u16le, "PCM unsigned 16-bit little-endian",
159        AV_NE(NULL, "uw"), AV_CODEC_ID_PCM_U16LE)
160
161 PCMDEF(u8, "PCM unsigned 8-bit",
162        "ub", AV_CODEC_ID_PCM_U8)
163
164 PCMDEF(alaw, "PCM A-law",
165        "al", AV_CODEC_ID_PCM_ALAW)
166
167 PCMDEF(mulaw, "PCM mu-law",
168        "ul", AV_CODEC_ID_PCM_MULAW)