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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* True Audio (TTA) muxer
* Copyright (c) 2016 James Almer
*
* 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 "libavutil/crc.h"
#include "libavutil/intreadwrite.h"
#include "apetag.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
typedef struct TTAMuxContext {
AVIOContext *seek_table;
AVPacketList *queue, *queue_end;
uint32_t nb_samples;
int frame_size;
int last_frame;
} TTAMuxContext;
static int tta_init(AVFormatContext *s)
{
TTAMuxContext *tta = s->priv_data;
AVCodecParameters *par;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
return AVERROR(EINVAL);
}
par = s->streams[0]->codecpar;
if (par->codec_id != AV_CODEC_ID_TTA) {
av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
return AVERROR(EINVAL);
}
if (par->extradata && par->extradata_size < 22) {
av_log(s, AV_LOG_ERROR, "Invalid TTA extradata\n");
return AVERROR_INVALIDDATA;
}
/* Prevent overflow */
if (par->sample_rate > 0x7FFFFFu) {
av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
return AVERROR(EINVAL);
}
tta->frame_size = par->sample_rate * 256 / 245;
avpriv_set_pts_info(s->streams[0], 64, 1, par->sample_rate);
return 0;
}
static int tta_write_header(AVFormatContext *s)
{
TTAMuxContext *tta = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
int ret;
if ((ret = avio_open_dyn_buf(&tta->seek_table)) < 0)
return ret;
/* Ignore most extradata information if present. It can be innacurate
if for example remuxing from Matroska */
ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
ffio_init_checksum(tta->seek_table, ff_crcEDB88320_update, UINT32_MAX);
avio_write(s->pb, "TTA1", 4);
avio_wl16(s->pb, par->extradata ? AV_RL16(par->extradata + 4) : 1);
avio_wl16(s->pb, par->channels);
avio_wl16(s->pb, par->bits_per_raw_sample);
avio_wl32(s->pb, par->sample_rate);
return 0;
}
static int tta_write_packet(AVFormatContext *s, AVPacket *pkt)
{
TTAMuxContext *tta = s->priv_data;
int ret;
ret = ff_packet_list_put(&tta->queue, &tta->queue_end, pkt,
FF_PACKETLIST_FLAG_REF_PACKET);
if (ret < 0) {
return ret;
}
avio_wl32(tta->seek_table, pkt->size);
tta->nb_samples += pkt->duration;
if (tta->frame_size != pkt->duration) {
if (tta->last_frame) {
/* Two frames with a different duration than the default frame
size means the TTA stream comes from a faulty container, and
there's no way the last frame duration will be correct. */
av_log(s, AV_LOG_ERROR, "Invalid frame durations\n");
return AVERROR_INVALIDDATA;
}
/* First frame with a different duration than the default frame size.
Assume it's the last frame in the stream and continue. */
tta->last_frame++;
}
return 0;
}
static void tta_queue_flush(AVFormatContext *s)
{
TTAMuxContext *tta = s->priv_data;
AVPacket pkt;
while (tta->queue) {
ff_packet_list_get(&tta->queue, &tta->queue_end, &pkt);
avio_write(s->pb, pkt.data, pkt.size);
av_packet_unref(&pkt);
}
}
static int tta_write_trailer(AVFormatContext *s)
{
TTAMuxContext *tta = s->priv_data;
uint8_t *ptr;
unsigned int crc;
int size;
avio_wl32(s->pb, tta->nb_samples);
crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
avio_wl32(s->pb, crc);
/* Write Seek table */
crc = ffio_get_checksum(tta->seek_table) ^ UINT32_MAX;
avio_wl32(tta->seek_table, crc);
size = avio_close_dyn_buf(tta->seek_table, &ptr);
avio_write(s->pb, ptr, size);
tta->seek_table = NULL;
av_free(ptr);
/* Write audio data */
tta_queue_flush(s);
ff_ape_write_tag(s);
avio_flush(s->pb);
return 0;
}
static void tta_deinit(AVFormatContext *s)
{
TTAMuxContext *tta = s->priv_data;
ffio_free_dyn_buf(&tta->seek_table);
ff_packet_list_free(&tta->queue, &tta->queue_end);
}
AVOutputFormat ff_tta_muxer = {
.name = "tta",
.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
.mime_type = "audio/x-tta",
.extensions = "tta",
.priv_data_size = sizeof(TTAMuxContext),
.audio_codec = AV_CODEC_ID_TTA,
.video_codec = AV_CODEC_ID_NONE,
.init = tta_init,
.deinit = tta_deinit,
.write_header = tta_write_header,
.write_packet = tta_write_packet,
.write_trailer = tta_write_trailer,
};
|
