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1 /*
2  * Copyright (c) 2015 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
21 #include "avformat.h"
22 #include "internal.h"
23 #include "pcm.h"
25 static int wve_probe(AVProbeData *p)
26 {
27  if (memcmp(p->buf, "ALawSoundFile**\0\017\020", 18) ||
28  memcmp(p->buf + 22, "\0\0\0\1\0\0\0\0\0\0", 10))
29  return 0;
31 }
34 {
35  AVStream *st;
37  st = avformat_new_stream(s, NULL);
38  if (!st)
39  return AVERROR(ENOMEM);
41  avio_skip(s->pb, 18);
42  st->duration = avio_rb32(s->pb);
45  st->codec->sample_rate = 8000;
46  st->codec->channels = 1;
49  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
50  avio_skip(s->pb, 10);
52  return 0;
53 }
56  .name = "wve",
57  .long_name = NULL_IF_CONFIG_SMALL("Psion 3 audio"),
58  .read_probe = wve_probe,
59  .read_header = wve_read_header,
60  .read_packet = ff_pcm_read_packet,
61  .read_seek = ff_pcm_read_seek,
62 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
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:4149
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:282
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2324
Format I/O context.
Definition: avformat.h:1314
static int wve_read_header(AVFormatContext *s)
Definition: wvedec.c:33
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:698
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3805
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2917
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3006
static int wve_probe(AVProbeData *p)
Definition: wvedec.c:25
#define AVERROR(e)
Definition: error.h:43
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
AVInputFormat ff_wve_demuxer
Definition: wvedec.c:55
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
Stream structure.
Definition: avformat.h:877
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
enum AVMediaType codec_type
Definition: avcodec.h:1540
enum AVCodecID codec_id
Definition: avcodec.h:1549
int sample_rate
samples per second
Definition: avcodec.h:2287
AVIOContext * pb
I/O context.
Definition: avformat.h:1356
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:936
maximum score
Definition: avformat.h:472
Main libavformat public API header.
int channels
number of audio channels
Definition: avcodec.h:2288
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661