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/*
* Chromaprint fingerprinting muxer
* Copyright (c) 2015 Rodger Combs
*
* 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 "libavutil/opt.h"
#include "libavcodec/internal.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;
ChromaprintContext ctx;
} ChromaprintMuxContext;
static void cleanup(ChromaprintMuxContext *cpr)
{
if (cpr->ctx) {
avpriv_lock_avformat();
chromaprint_free(cpr->ctx);
avpriv_unlock_avformat();
}
}
static int write_header(AVFormatContext *s)
{
ChromaprintMuxContext *cpr = s->priv_data;
AVStream *st;
avpriv_lock_avformat();
cpr->ctx = chromaprint_new(cpr->algorithm);
avpriv_unlock_avformat();
if (!cpr->ctx) {
av_log(s, AV_LOG_ERROR, "Failed to create chromaprint context.\n");
return AVERROR(ENOMEM);
}
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.\n");
goto fail;
}
#else
av_log(s, AV_LOG_ERROR, "Setting the silence threshold requires Chromaprint "
"version 0.7.0 or later.\n");
goto fail;
#endif
}
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
goto fail;
}
st = s->streams[0];
if (st->codecpar->channels > 2) {
av_log(s, AV_LOG_ERROR, "Only up to 2 channels are supported\n");
goto fail;
}
if (st->codecpar->sample_rate < 1000) {
av_log(s, AV_LOG_ERROR, "Sampling rate must be at least 1000\n");
goto fail;
}
if (!chromaprint_start(cpr->ctx, st->codecpar->sample_rate, st->codecpar->channels)) {
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av_log(s, AV_LOG_ERROR, "Failed to start chromaprint\n");
goto fail;
}
return 0;
fail:
cleanup(cpr);
return AVERROR(EINVAL);
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
ChromaprintMuxContext *cpr = s->priv_data;
return chromaprint_feed(cpr->ctx, 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, *enc_fp = NULL;
int size, enc_size, ret = AVERROR(EINVAL);
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, &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);
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);
cleanup(cpr);
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 },
{ "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,
};
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,
.flags = AVFMT_NOTIMESTAMPS,
.priv_class = &chromaprint_class,
};