FFmpeg
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->codecpar->codec_tag = id;
64  st->codecpar->codec_id = codec;
65  st->codecpar->channels = 1;
67  st->codecpar->sample_rate = rate;
68  st->codecpar->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
Bytestream IO Context.
Definition: avio.h:161
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3135
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:4896
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3960
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:788
AVInputFormat ff_rso_demuxer
Definition: rsodec.c:75
Format I/O context.
Definition: avformat.h:1358
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4469
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4062
static int rso_read_header(AVFormatContext *s)
Definition: rsodec.c:30
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1517
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3956
int block_align
Audio only.
Definition: avcodec.h:4077
audio channel layout utility functions
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:52
const AVCodecTag ff_codec_rso_tags[]
Definition: rso.c:26
Stream structure.
Definition: avformat.h:881
#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
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
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:930
int sample_rate
Audio only.
Definition: avcodec.h:4070
Main libavformat public API header.
unsigned bps
Definition: movenc.c:1532
int channels
Audio only.
Definition: avcodec.h:4066
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3964
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define AV_CH_LAYOUT_MONO
enum AVCodecID id