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111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
// Copyright (c) 2017-2020, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
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#include <Utils.hpp>
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#include "decoderFLAC.hpp"
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#define DR_FLAC_IMPLEMENTATION
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#define DR_FLAC_NO_STDIO
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#define DR_FLAC_NO_OGG
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#define DR_FLAC_NO_CRC
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#define DR_FLAC_NO_SIMD
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#include "dr_flac.h"
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namespace audio
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{
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decoderFLAC::decoderFLAC(const char *fileName) : decoder(fileName)
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{
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if (fileSize == 0) {
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return;
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}
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flac = drflac_open_with_metadata(drflac_read, drflac_seek, drflac_meta, this);
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if (flac == NULL) {
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return;
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}
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isInitialized = true;
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}
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decoderFLAC::~decoderFLAC()
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{
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drflac_close(flac);
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}
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uint32_t decoderFLAC::decode(uint32_t samplesToRead, int16_t *pcmData)
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{
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uint32_t samples_read = 0;
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samples_read = drflac_read_s16(flac, samplesToRead, (drflac_int16 *)pcmData);
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if (samples_read) {
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/* Calculate frame duration in seconds */
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position +=
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(float)((float)(chanNumber == 2 ? samplesToRead / chanNumber : samplesToRead) / (float)sampleRate);
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}
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return samples_read;
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}
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void decoderFLAC::setPosition(float pos)
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{
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drflac_seek_to_sample(flac, totalSamplesCount * pos);
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// Calculate new position
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position = (float)((float)(totalSamplesCount * pos) / chanNumber / (float)(sampleRate));
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}
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/* Data encoded in UTF-8 */
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void decoderFLAC::flac_parse_text(uint8_t *in, uint32_t taglen, uint32_t datalen, uint8_t *out, uint32_t outlen)
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{
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/* Little Endian here. */
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uint32_t size = datalen - taglen > outlen - 1 ? outlen - 1 : datalen - taglen;
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memcpy(out, in + taglen, size);
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out[size] = '\0';
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}
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size_t decoderFLAC::drflac_read(void *pUserData, void *pBufferOut, size_t bytesToRead)
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{
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decoderFLAC *userdata = (decoderFLAC *)pUserData;
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return std::fread(pBufferOut, 1, bytesToRead, userdata->fd);
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}
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drflac_bool32 decoderFLAC::drflac_seek(void *pUserData, int offset, drflac_seek_origin origin)
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{
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decoderFLAC *userdata = (decoderFLAC *)pUserData;
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return !std::fseek(userdata->fd, offset, origin == drflac_seek_origin_start ? SEEK_SET : SEEK_CUR);
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}
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void decoderFLAC::drflac_meta(void *pUserData, drflac_metadata *pMetadata)
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{
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decoderFLAC *userdata = (decoderFLAC *)pUserData;
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if (pMetadata->type == DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO) {
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userdata->tag->total_duration_s =
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(pMetadata->data.streaminfo.totalSampleCount / (pMetadata->data.streaminfo.bitsPerSample / 8)) /
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pMetadata->data.streaminfo.sampleRate;
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if (pMetadata->data.streaminfo.channels == 1) {
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userdata->tag->total_duration_s *= 2;
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}
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userdata->tag->duration_min = userdata->tag->total_duration_s / utils::secondsInMinute;
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userdata->tag->duration_hour = userdata->tag->duration_min / utils::secondsInMinute;
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userdata->tag->duration_sec = userdata->tag->total_duration_s % utils::secondsInMinute;
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userdata->tag->sample_rate = pMetadata->data.streaminfo.sampleRate;
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userdata->tag->num_channel = pMetadata->data.streaminfo.channels;
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userdata->sampleRate = pMetadata->data.streaminfo.sampleRate;
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userdata->chanNumber = pMetadata->data.streaminfo.channels;
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userdata->totalSamplesCount = pMetadata->data.streaminfo.totalSampleCount;
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}
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}
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} // namespace audio
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