SInt64 DZAudioQueuePlayer::seek(float time)
{
// Cannot seek if parameters not available or parser/queue not ready.
if (this->_format.mSampleRate <= 0 || this->_format.mFramesPerPacket <= 0) {
return -1;
}
if (this->_parser == NULL || this->_queue == NULL
|| this->_status == DZAudioQueuePlayerStatus_NotReady
|| this->_status == DZAudioQueuePlayerStatus_Error) {
return -1;
}
// Get audio data offset.
SInt64 dataOffset = 0;
UInt32 propertySize = sizeof(dataOffset);
if (dzDebugError(AudioFileStreamGetProperty(this->_parser, kAudioFileStreamProperty_DataOffset, &propertySize, &dataOffset), "Fail to get stream data offset.")) {
return -1;
}
// Reset audio queue to clear the current queue buffer.
if (dzDebugError(AudioQueueReset(this->_queue), "Fail to reset audio queue.")) {
return -1;
}
// Get audio queue current time.
AudioTimeStamp timeStamp;
if (this->_status == DZAudioQueuePlayerStatus_ReadyToStart) {
timeStamp.mSampleTime = 0;
} else if (dzDebugError(AudioQueueGetCurrentTime(this->_queue, NULL, &(timeStamp), NULL),
"Fail to get audio queue current time.")) {
return -1;
}
// Calculate packet offset and so the byte offset.
SInt64 packetOffset = round(time * this->_format.mSampleRate / this->_format.mFramesPerPacket);
SInt64 byteOffset = 0;
UInt32 ioFlag = 0;
if (dzDebugError(AudioFileStreamSeek(this->_parser, packetOffset, &byteOffset, &ioFlag),
"Fail to seek in audio file stream.")) {
return -1;
}
this->_timeAmendment = time - timeStamp.mSampleTime / this->_format.mSampleRate;
return byteOffset + dataOffset;
}
void audio_reset(audio_player_t *player) {
state_t *state = (state_t *) player->internal_state;
state->playing = false;
AudioQueueReset(state->queue);
}
