rsoenc.c
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1 /*
2  * RSO muxer
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 
23 #include "avformat.h"
24 #include "internal.h"
25 #include "riff.h"
26 #include "rso.h"
27 
29 {
30  AVIOContext *pb = s->pb;
31  AVCodecContext *enc = s->streams[0]->codec;
32 
33  if (!enc->codec_tag)
34  return AVERROR_INVALIDDATA;
35 
36  if (enc->channels != 1) {
37  av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");
38  return AVERROR_INVALIDDATA;
39  }
40 
41  if (!s->pb->seekable) {
42  av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
43  return AVERROR_INVALIDDATA;
44  }
45 
46  /* XXX: find legal sample rates (if any) */
47  if (enc->sample_rate >= 1u<<16) {
48  av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");
49  return AVERROR_INVALIDDATA;
50  }
51 
52  if (enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
53  av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
54  return AVERROR_PATCHWELCOME;
55  }
56 
57  /* format header */
58  avio_wb16(pb, enc->codec_tag); /* codec ID */
59  avio_wb16(pb, 0); /* data size, will be written at EOF */
60  avio_wb16(pb, enc->sample_rate);
61  avio_wb16(pb, 0x0000); /* play mode ? (0x0000 = don't loop) */
62 
63  avio_flush(pb);
64 
65  return 0;
66 }
67 
69 {
70  avio_write(s->pb, pkt->data, pkt->size);
71  return 0;
72 }
73 
75 {
76  AVIOContext *pb = s->pb;
77  int64_t file_size;
78  uint16_t coded_file_size;
79 
80  file_size = avio_tell(pb);
81 
82  if (file_size < 0)
83  return file_size;
84 
85  if (file_size > 0xffff + RSO_HEADER_SIZE) {
87  "Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);
88  coded_file_size = 0xffff;
89  } else {
90  coded_file_size = file_size - RSO_HEADER_SIZE;
91  }
92 
93  /* update file size */
94  avio_seek(pb, 2, SEEK_SET);
95  avio_wb16(pb, coded_file_size);
96  avio_seek(pb, file_size, SEEK_SET);
97 
98  return 0;
99 }
100 
102  .name = "rso",
103  .long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
104  .extensions = "rso",
105  .audio_codec = AV_CODEC_ID_PCM_U8,
106  .video_codec = AV_CODEC_ID_NONE,
107  .write_header = rso_write_header,
108  .write_packet = rso_write_packet,
109  .write_trailer = rso_write_trailer,
110  .codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0},
111 };
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:154
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:199
Format I/O context.
Definition: avformat.h:944
#define RSO_HEADER_SIZE
Definition: rso.h:27
static AVPacket pkt
Definition: demuxing.c:56
AVStream ** streams
Definition: avformat.h:992
uint8_t * data
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:173
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:246
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:662
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:117
int void avio_flush(AVIOContext *s)
Force flushing of buffered data to the output s.
Definition: aviobuf.c:193
static int rso_write_header(AVFormatContext *s)
Definition: rsoenc.c:28
const char * name
Definition: avformat.h:378
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
AVOutputFormat ff_rso_muxer
Definition: rsoenc.c:101
float u
static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rsoenc.c:68
const AVCodecTag ff_codec_rso_tags[]
Definition: rso.c:26
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
enum AVCodecID codec_id
int sample_rate
samples per second
AVIOContext * pb
I/O context.
Definition: avformat.h:977
main external API structure.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:148
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:373
Main libavformat public API header.
int channels
number of audio channels
This structure stores compressed data.
static int rso_write_trailer(AVFormatContext *s)
Definition: rsoenc.c:74