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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 };