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
28static int rso_write_header(AVFormatContext *s)
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
68static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
69{
70    avio_write(s->pb, pkt->data, pkt->size);
71    return 0;
72}
73
74static int rso_write_trailer(AVFormatContext *s)
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) {
86        av_log(s, AV_LOG_WARNING,
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
101AVOutputFormat ff_rso_muxer = {
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    .flags          =   AVFMT_NOTIMESTAMPS,
112};
113