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 = ff_rso_codec_tags_list,
83 };
AVERROR
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:724
pcm.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
rso.h
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:888
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:584
AVInputFormat
Definition: avformat.h:626
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
ff_codec_rso_tags
const AVCodecTag ff_codec_rso_tags[]
Definition: rso.c:26
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
ff_rso_codec_tags_list
const AVCodecTag *const ff_rso_codec_tags_list[]
Definition: rso.c:32
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:325
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:357
ff_rso_demuxer
const AVInputFormat ff_rso_demuxer
Definition: rsodec.c:75
bps
unsigned bps
Definition: movenc.c:1598
size
int size
Definition: twinvq_data.h:10344
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
rso_read_header
static int rso_read_header(AVFormatContext *s)
Definition: rsodec.c:30
ff_pcm_read_packet
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
AVStream
Stream structure.
Definition: avformat.h:845
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:56
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:758
avformat.h
channel_layout.h
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1146
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:353
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162