/* * 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;#if CPR_VERSION_INT >= AV_VERSION_INT(1, 4, 0)    ChromaprintContext *ctx;#else    ChromaprintContext ctx;#endif} 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)) {        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_PARAMstatic 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,};