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
184
185
186
187
188
189
190
|
/*
* Chromaprint fingerprinting muxer
* Copyright (c) 2015 rcombs
*
* 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 "libavutil/opt.h"
#include <chromaprint.h>
#define CPR_VERSION_INT AV_VERSION_INT(CHROMAPRINT_VERSION_MAJOR, \
CHROMAPRINT_VERSION_MINOR, \
CHROMAPRINT_VERSION_PATCH)
typedef enum FingerprintFormat {
FINGERPRINT_RAW,
FINGERPRINT_COMPRESSED,
FINGERPRINT_BASE64,
} FingerprintFormat;
typedef struct ChromaprintMuxContext {
const AVClass *class;
int silence_threshold;
int algorithm;
FingerprintFormat fp_format;
#if CPR_VERSION_INT >= AV_VERSION_INT(1, 4, 0)
ChromaprintContext *ctx;
#else
ChromaprintContext ctx;
#endif
} ChromaprintMuxContext;
static void deinit(AVFormatContext *s)
{
ChromaprintMuxContext *const cpr = s->priv_data;
if (cpr->ctx) {
ff_lock_avformat();
chromaprint_free(cpr->ctx);
ff_unlock_avformat();
}
}
static int write_header(AVFormatContext *s)
{
ChromaprintMuxContext *cpr = s->priv_data;
AVStream *st;
ff_lock_avformat();
cpr->ctx = chromaprint_new(cpr->algorithm);
ff_unlock_avformat();
if (!cpr->ctx) {
av_log(s, AV_LOG_ERROR, "Failed to create chromaprint context.\n");
return AVERROR_EXTERNAL;
}
if (cpr->silence_threshold != -1) {
#if CPR_VERSION_INT >= AV_VERSION_INT(0, 7, 0)
if (!chromaprint_set_option(cpr->ctx, "silence_threshold", cpr->silence_threshold)) {
av_log(s, AV_LOG_ERROR, "Failed to set silence threshold. Setting silence_threshold requires -algorithm 3 option.\n");
return AVERROR_EXTERNAL;
}
#else
av_log(s, AV_LOG_ERROR, "Setting the silence threshold requires Chromaprint "
"version 0.7.0 or later.\n");
return AVERROR(ENOSYS);
#endif
}
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
return AVERROR(EINVAL);
}
st = s->streams[0];
if (st->codecpar->ch_layout.nb_channels > 2) {
av_log(s, AV_LOG_ERROR, "Only up to 2 channels are supported\n");
return AVERROR(EINVAL);
}
if (st->codecpar->sample_rate < 1000) {
av_log(s, AV_LOG_ERROR, "Sampling rate must be at least 1000\n");
return AVERROR(EINVAL);
}
if (!chromaprint_start(cpr->ctx, st->codecpar->sample_rate, st->codecpar->ch_layout.nb_channels)) {
av_log(s, AV_LOG_ERROR, "Failed to start chromaprint\n");
return AVERROR_EXTERNAL;
}
return 0;
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
ChromaprintMuxContext *cpr = s->priv_data;
return chromaprint_feed(cpr->ctx, (const int16_t *)pkt->data, pkt->size / 2) ? 0 : AVERROR(EINVAL);
}
static int write_trailer(AVFormatContext *s)
{
ChromaprintMuxContext *cpr = s->priv_data;
AVIOContext *pb = s->pb;
void *fp = NULL;
char *enc_fp = NULL;
int size, enc_size, ret = AVERROR_EXTERNAL;
if (!chromaprint_finish(cpr->ctx)) {
av_log(s, AV_LOG_ERROR, "Failed to generate fingerprint\n");
goto fail;
}
if (!chromaprint_get_raw_fingerprint(cpr->ctx, (uint32_t **)&fp, &size)) {
av_log(s, AV_LOG_ERROR, "Failed to retrieve fingerprint\n");
goto fail;
}
switch (cpr->fp_format) {
case FINGERPRINT_RAW:
avio_write(pb, fp, size * 4); //fp points to array of uint32_t
break;
case FINGERPRINT_COMPRESSED:
case FINGERPRINT_BASE64:
if (!chromaprint_encode_fingerprint(fp, size, cpr->algorithm, &enc_fp, &enc_size,
cpr->fp_format == FINGERPRINT_BASE64)) {
av_log(s, AV_LOG_ERROR, "Failed to encode fingerprint\n");
goto fail;
}
avio_write(pb, enc_fp, enc_size);
break;
}
ret = 0;
fail:
if (fp)
chromaprint_dealloc(fp);
if (enc_fp)
chromaprint_dealloc(enc_fp);
return ret;
}
#define OFFSET(x) offsetof(ChromaprintMuxContext, x)
#define FLAGS AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "silence_threshold", "threshold for detecting silence", OFFSET(silence_threshold), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 32767, FLAGS },
{ "algorithm", "version of the fingerprint algorithm", OFFSET(algorithm), AV_OPT_TYPE_INT, { .i64 = CHROMAPRINT_ALGORITHM_DEFAULT }, CHROMAPRINT_ALGORITHM_TEST1, INT_MAX, FLAGS },
{ "fp_format", "fingerprint format to write", OFFSET(fp_format), AV_OPT_TYPE_INT, { .i64 = FINGERPRINT_BASE64 }, FINGERPRINT_RAW, FINGERPRINT_BASE64, FLAGS, "fp_format" },
{ "raw", "binary raw fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_RAW }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
{ "compressed", "binary compressed fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_COMPRESSED }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
{ "base64", "Base64 compressed fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_BASE64 }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
{ NULL },
};
static const AVClass chromaprint_class = {
.class_name = "chromaprint muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVOutputFormat ff_chromaprint_muxer = {
.name = "chromaprint",
.long_name = NULL_IF_CONFIG_SMALL("Chromaprint"),
.priv_data_size = sizeof(ChromaprintMuxContext),
.audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
.write_header = write_header,
.write_packet = write_packet,
.write_trailer = write_trailer,
.deinit = deinit,
.flags = AVFMT_NOTIMESTAMPS,
.priv_class = &chromaprint_class,
};
|
