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![wm4](/assets/img/avatar_default.png)
It's completely absurd that libavcodec would care about libavformat locking, but it was there because the lock manager was in libavcodec. This is more stright forward. Changes ABI, but we don't require ABI compatibility currently.
192 lines
6.2 KiB
C
192 lines
6.2 KiB
C
/*
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* Chromaprint fingerprinting muxer
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* Copyright (c) 2015 Rodger Combs
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/opt.h"
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#include "libavcodec/internal.h"
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#include <chromaprint.h>
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#define CPR_VERSION_INT AV_VERSION_INT(CHROMAPRINT_VERSION_MAJOR, \
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CHROMAPRINT_VERSION_MINOR, \
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CHROMAPRINT_VERSION_PATCH)
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typedef enum FingerprintFormat {
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FINGERPRINT_RAW,
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FINGERPRINT_COMPRESSED,
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FINGERPRINT_BASE64,
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} FingerprintFormat;
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typedef struct ChromaprintMuxContext {
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const AVClass *class;
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int silence_threshold;
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int algorithm;
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FingerprintFormat fp_format;
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#if CPR_VERSION_INT >= AV_VERSION_INT(1, 4, 0)
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ChromaprintContext *ctx;
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#else
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ChromaprintContext ctx;
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#endif
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} ChromaprintMuxContext;
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static void cleanup(ChromaprintMuxContext *cpr)
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{
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if (cpr->ctx) {
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ff_lock_avformat();
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chromaprint_free(cpr->ctx);
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ff_unlock_avformat();
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}
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}
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static int write_header(AVFormatContext *s)
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{
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ChromaprintMuxContext *cpr = s->priv_data;
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AVStream *st;
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ff_lock_avformat();
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cpr->ctx = chromaprint_new(cpr->algorithm);
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ff_unlock_avformat();
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if (!cpr->ctx) {
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av_log(s, AV_LOG_ERROR, "Failed to create chromaprint context.\n");
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return AVERROR(ENOMEM);
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}
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if (cpr->silence_threshold != -1) {
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#if CPR_VERSION_INT >= AV_VERSION_INT(0, 7, 0)
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if (!chromaprint_set_option(cpr->ctx, "silence_threshold", cpr->silence_threshold)) {
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av_log(s, AV_LOG_ERROR, "Failed to set silence threshold.\n");
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goto fail;
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}
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#else
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av_log(s, AV_LOG_ERROR, "Setting the silence threshold requires Chromaprint "
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"version 0.7.0 or later.\n");
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goto fail;
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#endif
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}
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if (s->nb_streams != 1) {
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av_log(s, AV_LOG_ERROR, "Only one stream is supported\n");
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goto fail;
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}
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st = s->streams[0];
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if (st->codecpar->channels > 2) {
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av_log(s, AV_LOG_ERROR, "Only up to 2 channels are supported\n");
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goto fail;
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}
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if (st->codecpar->sample_rate < 1000) {
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av_log(s, AV_LOG_ERROR, "Sampling rate must be at least 1000\n");
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goto fail;
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}
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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");
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goto fail;
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}
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return 0;
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fail:
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cleanup(cpr);
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return AVERROR(EINVAL);
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ChromaprintMuxContext *cpr = s->priv_data;
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return chromaprint_feed(cpr->ctx, pkt->data, pkt->size / 2) ? 0 : AVERROR(EINVAL);
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}
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static int write_trailer(AVFormatContext *s)
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{
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ChromaprintMuxContext *cpr = s->priv_data;
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AVIOContext *pb = s->pb;
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void *fp = NULL, *enc_fp = NULL;
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int size, enc_size, ret = AVERROR(EINVAL);
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if (!chromaprint_finish(cpr->ctx)) {
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av_log(s, AV_LOG_ERROR, "Failed to generate fingerprint\n");
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goto fail;
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}
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if (!chromaprint_get_raw_fingerprint(cpr->ctx, &fp, &size)) {
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av_log(s, AV_LOG_ERROR, "Failed to retrieve fingerprint\n");
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goto fail;
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}
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switch (cpr->fp_format) {
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case FINGERPRINT_RAW:
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avio_write(pb, fp, size);
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break;
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case FINGERPRINT_COMPRESSED:
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case FINGERPRINT_BASE64:
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if (!chromaprint_encode_fingerprint(fp, size, cpr->algorithm, &enc_fp, &enc_size,
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cpr->fp_format == FINGERPRINT_BASE64)) {
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av_log(s, AV_LOG_ERROR, "Failed to encode fingerprint\n");
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goto fail;
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}
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avio_write(pb, enc_fp, enc_size);
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break;
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}
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ret = 0;
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fail:
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if (fp)
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chromaprint_dealloc(fp);
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if (enc_fp)
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chromaprint_dealloc(enc_fp);
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cleanup(cpr);
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return ret;
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}
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#define OFFSET(x) offsetof(ChromaprintMuxContext, x)
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#define FLAGS AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "silence_threshold", "threshold for detecting silence", OFFSET(silence_threshold), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 32767, FLAGS },
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{ "algorithm", "version of the fingerprint algorithm", OFFSET(algorithm), AV_OPT_TYPE_INT, { .i64 = CHROMAPRINT_ALGORITHM_DEFAULT }, CHROMAPRINT_ALGORITHM_TEST1, INT_MAX, FLAGS },
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{ "fp_format", "fingerprint format to write", OFFSET(fp_format), AV_OPT_TYPE_INT, { .i64 = FINGERPRINT_BASE64 }, FINGERPRINT_RAW, FINGERPRINT_BASE64, FLAGS },
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{ "raw", "binary raw fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_RAW }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
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{ "compressed", "binary compressed fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_COMPRESSED }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
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{ "base64", "Base64 compressed fingerprint", 0, AV_OPT_TYPE_CONST, {.i64 = FINGERPRINT_BASE64 }, INT_MIN, INT_MAX, FLAGS, "fp_format"},
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{ NULL },
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};
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static const AVClass chromaprint_class = {
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.class_name = "chromaprint muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVOutputFormat ff_chromaprint_muxer = {
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.name = "chromaprint",
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.long_name = NULL_IF_CONFIG_SMALL("Chromaprint"),
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.priv_data_size = sizeof(ChromaprintMuxContext),
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.audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
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.write_header = write_header,
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.write_packet = write_packet,
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.write_trailer = write_trailer,
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.flags = AVFMT_NOTIMESTAMPS,
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.priv_class = &chromaprint_class,
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};
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