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pvfdec.c
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1 /*
2  * PVF 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 "avformat.h"
23 #include "internal.h"
24 #include "pcm.h"
25 
26 static int pvf_probe(AVProbeData *p)
27 {
28  if (!memcmp(p->buf, "PVF1\n", 5))
29  return AVPROBE_SCORE_MAX;
30  return 0;
31 }
32 
34 {
35  char buffer[32];
36  AVStream *st;
37  int bps, channels, sample_rate;
38 
39  avio_skip(s->pb, 5);
40  ff_get_line(s->pb, buffer, sizeof(buffer));
41  if (sscanf(buffer, "%d %d %d",
42  &channels,
43  &sample_rate,
44  &bps) != 3)
45  return AVERROR_INVALIDDATA;
46 
47  if (channels <= 0 || bps <= 0 || sample_rate <= 0)
48  return AVERROR_INVALIDDATA;
49 
50  st = avformat_new_stream(s, NULL);
51  if (!st)
52  return AVERROR(ENOMEM);
53 
55  st->codec->channels = channels;
57  st->codec->codec_id = ff_get_pcm_codec_id(bps, 0, 1, 0xFFFF);
59  st->codec->block_align = bps * st->codec->channels / 8;
60 
61  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
62 
63  return 0;
64 }
65 
67  .name = "pvf",
68  .long_name = NULL_IF_CONFIG_SMALL("PVF (Portable Voice Format)"),
69  .read_probe = pvf_probe,
70  .read_header = pvf_read_header,
71  .read_packet = ff_pcm_read_packet,
72  .read_seek = ff_pcm_read_seek,
73  .extensions = "pvf",
74  .flags = AVFMT_GENERIC_INDEX,
75 };
#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
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:4071
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 pvf_read_header(AVFormatContext *s)
Definition: pvfdec.c:33
Format I/O context.
Definition: avformat.h:1272
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3737
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2997
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
static int pvf_probe(AVProbeData *p)
Definition: pvfdec.c:26
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_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:698
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
Stream structure.
Definition: avformat.h:842
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
AVInputFormat ff_pvf_demuxer
Definition: pvfdec.c:66
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:1314
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:473
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
Select a PCM codec based on the given parameters.
Definition: utils.c:2782
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
unsigned bps
Definition: movenc.c:1334
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
GLuint buffer
Definition: opengl_enc.c:102