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ircamdec.c
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1 /*
2  * IRCAM demuxer
3  * Copyright (c) 2012 Paul B Mahol
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/intreadwrite.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "pcm.h"
26 #include "ircam.h"
27 
28 static int ircam_probe(AVProbeData *p)
29 {
30  if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&
31  p->buf[2] >= 1 && p->buf[2] <= 4) ||
32  (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&
33  p->buf[1] >= 1 && p->buf[1] <= 3) &&
34  AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))
35  return AVPROBE_SCORE_MAX / 4 * 3;
36  return 0;
37 }
38 
39 static const struct endianess {
40  uint32_t magic;
41  int is_le;
42 } table[] = {
43  { 0x64A30100, 0 },
44  { 0x64A30200, 1 },
45  { 0x64A30300, 0 },
46  { 0x64A30400, 1 },
47  { 0x0001A364, 1 },
48  { 0x0002A364, 0 },
49  { 0x0003A364, 1 },
50 };
51 
53 {
54  uint32_t magic, sample_rate, channels, tag;
55  const AVCodecTag *tags;
56  int le = -1, i;
57  AVStream *st;
58 
59  magic = avio_rl32(s->pb);
60  for (i = 0; i < 7; i++) {
61  if (magic == table[i].magic) {
62  le = table[i].is_le;
63  break;
64  }
65  }
66 
67  if (le == 1) {
68  sample_rate = av_int2float(avio_rl32(s->pb));
69  channels = avio_rl32(s->pb);
70  tag = avio_rl32(s->pb);
72  } else if (le == 0) {
73  sample_rate = av_int2float(avio_rb32(s->pb));
74  channels = avio_rb32(s->pb);
75  tag = avio_rb32(s->pb);
77  } else {
78  return AVERROR_INVALIDDATA;
79  }
80 
81  if (!channels || !sample_rate)
82  return AVERROR_INVALIDDATA;
83 
84  st = avformat_new_stream(s, NULL);
85  if (!st)
86  return AVERROR(ENOMEM);
87 
89  st->codec->channels = channels;
91 
92  st->codec->codec_id = ff_codec_get_id(tags, tag);
93  if (st->codec->codec_id == AV_CODEC_ID_NONE) {
94  av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag);
95  return AVERROR_INVALIDDATA;
96  }
97 
100  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
101  avio_skip(s->pb, 1008);
102 
103  return 0;
104 }
105 
107  .name = "ircam",
108  .long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
109  .read_probe = ircam_probe,
110  .read_header = ircam_read_header,
111  .read_packet = ff_pcm_read_packet,
112  .read_seek = ff_pcm_read_seek,
113  .extensions = "sf,ircam",
114  .flags = AVFMT_GENERIC_INDEX,
115 };
AVInputFormat ff_ircam_demuxer
Definition: ircamdec.c:106
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
const AVCodecTag ff_codec_ircam_be_tags[]
Definition: ircam.c:37
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2773
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4075
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition: intfloat.h:40
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:277
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2298
static int ircam_read_header(AVFormatContext *s)
Definition: ircamdec.c:52
Format I/O context.
Definition: avformat.h:1273
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:690
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3741
uint32_t tag
Definition: movenc.c:1334
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2995
#define av_log(a,...)
const AVCodecTag ff_codec_ircam_le_tags[]
Definition: ircam.c:25
uint32_t magic
Definition: ircamdec.c:40
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3392
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:659
#define AVERROR(e)
Definition: error.h:43
static const struct endianess table[]
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
static int ircam_probe(AVProbeData *p)
Definition: ircamdec.c:28
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
uint8_t le
Definition: crc.c:294
Stream structure.
Definition: avformat.h:842
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
sample_rate
enum AVMediaType codec_type
Definition: avcodec.h:1509
enum AVCodecID codec_id
Definition: avcodec.h:1518
int sample_rate
samples per second
Definition: avcodec.h:2261
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:473
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
#define AV_RN32(p)
Definition: intreadwrite.h:364
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
int is_le
Definition: ircamdec.c:41
int channels
number of audio channels
Definition: avcodec.h:2262
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628