blob: e34e2c64e20ca476a5d5f54f5326b81d3b066a90
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 | |
28 | static int rso_write_header(AVFormatContext *s) |
29 | { |
30 | AVIOContext *pb = s->pb; |
31 | AVCodecParameters *par = s->streams[0]->codecpar; |
32 | |
33 | if (!par->codec_tag) |
34 | return AVERROR_INVALIDDATA; |
35 | |
36 | if (par->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 & AVIO_SEEKABLE_NORMAL)) { |
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 (par->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 (par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) { |
53 | avpriv_report_missing_feature(s, "ADPCM in RSO"); |
54 | return AVERROR_PATCHWELCOME; |
55 | } |
56 | |
57 | /* format header */ |
58 | avio_wb16(pb, par->codec_tag); /* codec ID */ |
59 | avio_wb16(pb, 0); /* data size, will be written at EOF */ |
60 | avio_wb16(pb, par->sample_rate); |
61 | avio_wb16(pb, 0x0000); /* play mode ? (0x0000 = don't loop) */ |
62 | |
63 | avio_flush(pb); |
64 | |
65 | return 0; |
66 | } |
67 | |
68 | static int rso_write_packet(AVFormatContext *s, AVPacket *pkt) |
69 | { |
70 | avio_write(s->pb, pkt->data, pkt->size); |
71 | return 0; |
72 | } |
73 | |
74 | static 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 | |
101 | AVOutputFormat 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 |