FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
chromaprint.c
Go to the documentation of this file.
1 /*
2  * Chromaprint fingerprinting muxer
3  * Copyright (c) 2015 Rodger Combs
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avformat.h"
23 #include "internal.h"
24 #include "libavutil/opt.h"
25 #include "libavcodec/internal.h"
26 #include <chromaprint.h>
27 
28 #define CPR_VERSION_INT AV_VERSION_INT(CHROMAPRINT_VERSION_MAJOR, \
29  CHROMAPRINT_VERSION_MINOR, \
30  CHROMAPRINT_VERSION_PATCH)
31 
32 typedef enum FingerprintFormat {
37 
38 typedef struct ChromaprintMuxContext {
39  const AVClass *class;
41  int algorithm;
43 #if CPR_VERSION_INT >= AV_VERSION_INT(1, 4, 0)
44  ChromaprintContext *ctx;
45 #else
46  ChromaprintContext ctx;
47 #endif
49 
50 static void cleanup(ChromaprintMuxContext *cpr)
51 {
52  if (cpr->ctx) {
54  chromaprint_free(cpr->ctx);
56  }
57 }
58 
60 {
62  AVStream *st;
63 
65  cpr->ctx = chromaprint_new(cpr->algorithm);
67 
68  if (!cpr->ctx) {
69  av_log(s, AV_LOG_ERROR, "Failed to create chromaprint context.\n");
70  return AVERROR(ENOMEM);
71  }
72 
73  if (cpr->silence_threshold != -1) {
74 #if CPR_VERSION_INT >= AV_VERSION_INT(0, 7, 0)
75  if (!chromaprint_set_option(cpr->ctx, "silence_threshold", cpr->silence_threshold)) {
76  av_log(s, AV_LOG_ERROR, "Failed to set silence threshold.\n");
77  goto fail;
78  }
79 #else
80  av_log(s, AV_LOG_ERROR, "Setting the silence threshold requires Chromaprint "
81  "version 0.7.0 or later.\n");
82  goto fail;
83 #endif
84  }
85 
86  if (s->nb_streams != 1) {
87  av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
88  goto fail;
89  }
90 
91  st = s->streams[0];
92 
93  if (st->codecpar->channels > 2) {
94  av_log(s, AV_LOG_ERROR, "Only up to 2 channels are supported\n");
95  goto fail;
96  }
97 
98  if (st->codecpar->sample_rate < 1000) {
99  av_log(s, AV_LOG_ERROR, "Sampling rate must be at least 1000\n");
100  goto fail;
101  }
102 
103  if (!chromaprint_start(cpr->ctx, st->codecpar->sample_rate, st->codecpar->channels)) {
104  av_log(s, AV_LOG_ERROR, "Failed to start chromaprint\n");
105  goto fail;
106  }
107 
108  return 0;
109 fail:
110  cleanup(cpr);
111  return AVERROR(EINVAL);
112 }
113 
115 {
117  return chromaprint_feed(cpr->ctx, pkt->data, pkt->size / 2) ? 0 : AVERROR(EINVAL);
118 }
119 
121 {
123  AVIOContext *pb = s->pb;
124  void *fp = NULL, *enc_fp = NULL;
125  int size, enc_size, ret = AVERROR(EINVAL);
126 
127  if (!chromaprint_finish(cpr->ctx)) {
128  av_log(s, AV_LOG_ERROR, "Failed to generate fingerprint\n");
129  goto fail;
130  }
131 
132  if (!chromaprint_get_raw_fingerprint(cpr->ctx, &fp, &size)) {
133  av_log(s, AV_LOG_ERROR, "Failed to retrieve fingerprint\n");
134  goto fail;
135  }
136 
137  switch (cpr->fp_format) {
138  case FINGERPRINT_RAW:
139  avio_write(pb, fp, size);
140  break;
142  case FINGERPRINT_BASE64:
143  if (!chromaprint_encode_fingerprint(fp, size, cpr->algorithm, &enc_fp, &enc_size,
144  cpr->fp_format == FINGERPRINT_BASE64)) {
145  av_log(s, AV_LOG_ERROR, "Failed to encode fingerprint\n");
146  goto fail;
147  }
148  avio_write(pb, enc_fp, enc_size);
149  break;
150  }
151 
152  ret = 0;
153 fail:
154  if (fp)
155  chromaprint_dealloc(fp);
156  if (enc_fp)
157  chromaprint_dealloc(enc_fp);
158  cleanup(cpr);
159  return ret;
160 }
161 
162 #define OFFSET(x) offsetof(ChromaprintMuxContext, x)
163 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM
164 static const AVOption options[] = {
165  { "silence_threshold", "threshold for detecting silence", OFFSET(silence_threshold), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 32767, FLAGS },
166  { "algorithm", "version of the fingerprint algorithm", OFFSET(algorithm), AV_OPT_TYPE_INT, { .i64 = CHROMAPRINT_ALGORITHM_DEFAULT }, CHROMAPRINT_ALGORITHM_TEST1, INT_MAX, FLAGS },
167  { "fp_format", "fingerprint format to write", OFFSET(fp_format), AV_OPT_TYPE_INT, { .i64 = FINGERPRINT_BASE64 }, FINGERPRINT_RAW, FINGERPRINT_BASE64, FLAGS },
168  { "raw", "binary raw fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_RAW }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
169  { "compressed", "binary compressed fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_COMPRESSED }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
170  { "base64", "Base64 compressed fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_BASE64 }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
171  { NULL },
172 };
173 
174 static const AVClass chromaprint_class = {
175  .class_name = "chromaprint muxer",
176  .item_name = av_default_item_name,
177  .option = options,
178  .version = LIBAVUTIL_VERSION_INT,
179 };
180 
182  .name = "chromaprint",
183  .long_name = NULL_IF_CONFIG_SMALL("Chromaprint"),
184  .priv_data_size = sizeof(ChromaprintMuxContext),
186  .write_header = write_header,
187  .write_packet = write_packet,
188  .write_trailer = write_trailer,
189  .flags = AVFMT_NOTIMESTAMPS,
190  .priv_class = &chromaprint_class,
191 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
AVOption.
Definition: opt.h:246
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int size
Definition: avcodec.h:1446
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
AVOutputFormat ff_chromaprint_muxer
Definition: chromaprint.c:181
static AVPacket pkt
ChromaprintContext * ctx
Definition: chromaprint.c:44
Format I/O context.
Definition: avformat.h:1351
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
static int write_header(AVFormatContext *s)
Definition: chromaprint.c:59
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: chromaprint.c:114
AVOptions.
#define AV_NE(be, le)
Definition: common.h:50
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
uint8_t * data
Definition: avcodec.h:1445
ptrdiff_t size
Definition: opengl_enc.c:101
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define fail()
Definition: checkasm.h:117
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
int ff_unlock_avformat(void)
Definition: utils.c:88
const char * name
Definition: avformat.h:507
#define s(width, name)
Definition: cbs_vp9.c:257
Stream structure.
Definition: avformat.h:874
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:469
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
static void cleanup(ChromaprintMuxContext *cpr)
Definition: chromaprint.c:50
#define FLAGS
Definition: chromaprint.c:163
#define fp
Definition: regdef.h:44
static const AVClass chromaprint_class
Definition: chromaprint.c:174
Describe the class of an AVClass context structure.
Definition: log.h:67
#define OFFSET(x)
Definition: chromaprint.c:162
static int write_trailer(AVFormatContext *s)
Definition: chromaprint.c:120
int sample_rate
Audio only.
Definition: avcodec.h:4010
Main libavformat public API header.
common internal api header.
void * priv_data
Format private data.
Definition: avformat.h:1379
FingerprintFormat fp_format
Definition: chromaprint.c:42
int channels
Audio only.
Definition: avcodec.h:4006
int ff_lock_avformat(void)
Definition: utils.c:83
static const AVOption options[]
Definition: chromaprint.c:164
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
FingerprintFormat
Definition: chromaprint.c:32
This structure stores compressed data.
Definition: avcodec.h:1422