aac5773f
 hucm
功能基本完成，接口待打磨
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* RSO muxer
* Copyright (c) 2001 Fabrice Bellard (original AU code)
* Copyright (c) 2010 Rafael Carre
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "internal.h"
#include "riff.h"
#include "rso.h"
static int rso_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[0]->codecpar;
if (!par->codec_tag)
return AVERROR_INVALIDDATA;
if (par->channels != 1) {
av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");
return AVERROR_INVALIDDATA;
}
if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
return AVERROR_INVALIDDATA;
}
/* XXX: find legal sample rates (if any) */
if (par->sample_rate >= 1u<<16) {
av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");
return AVERROR_INVALIDDATA;
}
if (par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
avpriv_report_missing_feature(s, "ADPCM in RSO");
return AVERROR_PATCHWELCOME;
}
/* format header */
avio_wb16(pb, par->codec_tag); /* codec ID */
avio_wb16(pb, 0); /* data size, will be written at EOF */
avio_wb16(pb, par->sample_rate);
avio_wb16(pb, 0x0000); /* play mode ? (0x0000 = don't loop) */
avio_flush(pb);
return 0;
}
static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
{
avio_write(s->pb, pkt->data, pkt->size);
return 0;
}
static int rso_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
int64_t file_size;
uint16_t coded_file_size;
file_size = avio_tell(pb);
if (file_size < 0)
return file_size;
if (file_size > 0xffff + RSO_HEADER_SIZE) {
av_log(s, AV_LOG_WARNING,
"Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);
coded_file_size = 0xffff;
} else {
coded_file_size = file_size - RSO_HEADER_SIZE;
}
/* update file size */
avio_seek(pb, 2, SEEK_SET);
avio_wb16(pb, coded_file_size);
avio_seek(pb, file_size, SEEK_SET);
return 0;
}
AVOutputFormat ff_rso_muxer = {
.name = "rso",
.long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
.extensions = "rso",
.audio_codec = AV_CODEC_ID_PCM_U8,
.video_codec = AV_CODEC_ID_NONE,
.write_header = rso_write_header,
.write_packet = rso_write_packet,
.write_trailer = rso_write_trailer,
.codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0},
.flags = AVFMT_NOTIMESTAMPS,
};
|
