Libav
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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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 
69  avpriv_set_pts_info(st, 64, 1, rate);
70 
71  return 0;
72 }
73 
74 #define BLOCK_SIZE 1024 /* in samples */
75 
77 {
79  int ret = av_get_packet(s->pb, pkt, BLOCK_SIZE * bps >> 3);
80 
81  if (ret < 0)
82  return ret;
83 
84  pkt->stream_index = 0;
85 
86  /* note: we need to modify the packet size here to handle the last packet */
87  pkt->size = ret;
88 
89  return 0;
90 }
91 
93  .name = "rso",
94  .long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
95  .extensions = "rso",
96  .read_header = rso_read_header,
97  .read_packet = rso_read_packet,
98  .read_seek = ff_pcm_read_seek,
99  .codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0},
100 };