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rsodec.c
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1 /*
2  * RSO demuxer
3  * Copyright (c) 2001 Fabrice Bellard (original AU code)
4  * Copyright (c) 2010 Rafael Carre
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "pcm.h"
28 #include "rso.h"
29 
31 {
32  AVIOContext *pb = s->pb;
33  int id, rate, bps;
34  unsigned int size;
35  enum AVCodecID codec;
36  AVStream *st;
37 
38  id = avio_rb16(pb);
39  size = avio_rb16(pb);
40  rate = avio_rb16(pb);
41  avio_rb16(pb); /* play mode ? (0x0000 = don't loop) */
42 
44 
45  if (codec == AV_CODEC_ID_ADPCM_IMA_WAV) {
46  avpriv_report_missing_feature(s, "ADPCM in RSO");
47  return AVERROR_PATCHWELCOME;
48  }
49 
50  bps = av_get_bits_per_sample(codec);
51  if (!bps) {
52  avpriv_request_sample(s, "Unknown bits per sample");
53  return AVERROR_PATCHWELCOME;
54  }
55 
56  /* now we are ready: build format streams */
57  st = avformat_new_stream(s, NULL);
58  if (!st)
59  return AVERROR(ENOMEM);
60 
61  st->duration = (size * 8) / bps;
63  st->codec->codec_tag = id;
64  st->codec->codec_id = codec;
65  st->codec->channels = 1;
67  st->codec->sample_rate = rate;
68  st->codec->block_align = 1;
69 
70  avpriv_set_pts_info(st, 64, 1, rate);
71 
72  return 0;
73 }
74 
76  .name = "rso",
77  .long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
78  .extensions = "rso",
79  .read_header = rso_read_header,
80  .read_packet = ff_pcm_read_packet,
81  .read_seek = ff_pcm_read_seek,
82  .codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0},
83 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
enum AVCodecID id
Definition: mxfenc.c:99
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2713
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:4006
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:675
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2049
AVInputFormat ff_rso_demuxer
Definition: rsodec.c:75
Format I/O context.
Definition: avformat.h:1272
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3672
ptrdiff_t size
Definition: opengl_enc.c:101
static int rso_read_header(AVFormatContext *s)
Definition: rsodec.c:30
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3326
#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
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2073
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
audio channel layout utility functions
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
const AVCodecTag ff_codec_rso_tags[]
Definition: rso.c:26
Stream structure.
Definition: avformat.h:842
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
enum AVMediaType codec_type
Definition: avcodec.h:1260
enum AVCodecID codec_id
Definition: avcodec.h:1269
int sample_rate
samples per second
Definition: avcodec.h:2012
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1284
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:901
Main libavformat public API header.
unsigned bps
Definition: movenc.c:1334
int channels
number of audio channels
Definition: avcodec.h:2013
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
#define AV_CH_LAYOUT_MONO