/*----------------------------------------------------------------------
| AlsaOutput_PutPacket
+---------------------------------------------------------------------*/
BLT_METHOD
AlsaOutput_PutPacket(BLT_PacketConsumer* _self,
BLT_MediaPacket* packet)
{
AlsaOutput* self = ATX_SELF(AlsaOutput, BLT_PacketConsumer);
const BLT_PcmMediaType* media_type;
BLT_ByteBuffer buffer;
BLT_Size size;
BLT_Result result;
/* check parameters */
if (packet == NULL) {
return BLT_ERROR_INVALID_PARAMETERS;
}
/* check the payload buffer and size */
buffer = BLT_MediaPacket_GetPayloadBuffer(packet);
size = BLT_MediaPacket_GetPayloadSize(packet);
if (size == 0) return BLT_SUCCESS;
/* get the media type */
result = BLT_MediaPacket_GetMediaType(packet, (const BLT_MediaType**)(const void*)&media_type);
if (BLT_FAILED(result)) return result;
/* check the media type */
if (media_type->base.id != BLT_MEDIA_TYPE_ID_AUDIO_PCM) {
return BLT_ERROR_INVALID_MEDIA_TYPE;
}
/* configure the device for this format */
result = AlsaOutput_Configure(self, media_type);
if (BLT_FAILED(result)) return result;
/* update the media time */
{
BLT_TimeStamp ts = BLT_MediaPacket_GetTimeStamp(packet);
ATX_UInt64 ts_nanos = BLT_TimeStamp_ToNanos(ts);
BLT_TimeStamp packet_duration;
if (media_type->sample_rate &&
media_type->channel_count &&
media_type->bits_per_sample) {
unsigned int sample_count = BLT_MediaPacket_GetPayloadSize(packet)/
(media_type->channel_count*media_type->bits_per_sample/8);
packet_duration = BLT_TimeStamp_FromSamples(sample_count, media_type->sample_rate);
} else {
packet_duration = BLT_TimeStamp_FromSeconds(0);
}
if (ts_nanos == 0) {
self->media_time = self->next_media_time;
} else {
self->media_time = ts_nanos;
}
self->next_media_time = self->media_time+BLT_TimeStamp_ToNanos(packet_duration);
}
/* write the audio samples */
return AlsaOutput_Write(self, buffer, size);
}
/*----------------------------------------------------------------------
| AlsaOutput_Seek
+---------------------------------------------------------------------*/
BLT_METHOD
AlsaOutput_Seek(BLT_MediaNode* _self,
BLT_SeekMode* mode,
BLT_SeekPoint* point)
{
AlsaOutput* self = ATX_SELF_EX(AlsaOutput, BLT_BaseMediaNode, BLT_MediaNode);
BLT_COMPILER_UNUSED(mode);
BLT_COMPILER_UNUSED(point);
/* ignore unless we're prepared */
if (self->state != BLT_ALSA_OUTPUT_STATE_PREPARED) {
return BLT_SUCCESS;
}
/* reset the device */
AlsaOutput_Reset(self);
/* update the media time */
if (point->mask & BLT_SEEK_POINT_MASK_TIME_STAMP) {
self->media_time = BLT_TimeStamp_ToNanos(point->time_stamp);
self->next_media_time = self->media_time;
} else {
self->media_time = 0;
self->next_media_time = 0;
}
return BLT_SUCCESS;
}
/*----------------------------------------------------------------------
| OsxAudioUnitsOutput_GetStatus
+---------------------------------------------------------------------*/
BLT_METHOD
OsxAudioUnitsOutput_GetStatus(BLT_OutputNode* _self,
BLT_OutputNodeStatus* status)
{
OsxAudioUnitsOutput* self = ATX_SELF(OsxAudioUnitsOutput, BLT_OutputNode);
/* default values */
status->flags = 0;
pthread_mutex_lock(&self->lock);
/* check if the queue is full */
if (ATX_List_GetItemCount(self->packet_queue) >= self->max_packets_in_queue) {
ATX_LOG_FINER("packet queue is full");
status->flags |= BLT_OUTPUT_NODE_STATUS_QUEUE_FULL;
}
/* compute the media time */
BLT_TimeStamp_Set(status->media_time, 0, 0);
if (self->media_time_snapshot.rendered_host_time) {
UInt64 host_time = AudioConvertHostTimeToNanos(AudioGetCurrentHostTime());
UInt64 media_time = BLT_TimeStamp_ToNanos(self->media_time_snapshot.rendered_packet_ts);
ATX_LOG_FINER_3("host time = %lld, last rendered packet = %lld, rendered ts = %lld",
host_time,
self->media_time_snapshot.rendered_host_time,
media_time);
if (host_time > self->media_time_snapshot.rendered_host_time) {
media_time += host_time-self->media_time_snapshot.rendered_host_time;
}
UInt64 max_media_time;
max_media_time = BLT_TimeStamp_ToNanos(self->media_time_snapshot.rendered_packet_ts) +
BLT_TimeStamp_ToNanos(self->media_time_snapshot.rendered_duration);
ATX_LOG_FINER_2("computed media time = %lld, max media time = %lld",
media_time, max_media_time);
if (media_time > max_media_time) {
ATX_LOG_FINER("media time clamped to max");
media_time = max_media_time;
}
status->media_time = BLT_TimeStamp_FromNanos(media_time);
ATX_LOG_FINER_1("media time = %lld", media_time);
}
pthread_mutex_unlock(&self->lock);
return BLT_SUCCESS;
}
/*----------------------------------------------------------------------
| BLT_DecoderServer::UpdateStatus
+---------------------------------------------------------------------*/
BLT_Result
BLT_DecoderServer::UpdateStatus()
{
BLT_DecoderStatus status;
BLT_Result result;
// get the decoder status
result = BLT_Decoder_GetStatus(m_Decoder, &status);
if (BLT_FAILED(result)) return result;
// notify if the time has changed by more than the update threshold
// NOTE: current and previous here are measured in milliseconds
ATX_UInt64 previous = BLT_TimeStamp_ToNanos(m_DecoderStatus.time_stamp)/1000000;
ATX_UInt64 current = BLT_TimeStamp_ToNanos(status.time_stamp)/1000000;
if (m_TimeStampUpdateQuantum) {
// make the new time stamp a multiple of the update quantum
current /= m_TimeStampUpdateQuantum;
current *= m_TimeStampUpdateQuantum;
}
if (current != previous) {
m_DecoderStatus.time_stamp = BLT_TimeStamp_FromMillis(current);
NotifyTimeCode();
}
// convert the stream position into a decoder position
if (m_PositionUpdateRange != 0) {
ATX_UInt64 ratio = status.position.range/m_PositionUpdateRange;
ATX_UInt64 offset;
if (ratio == 0) {
offset = 0;
} else {
offset = status.position.offset/ratio;
}
if (offset != m_DecoderStatus.position.offset) {
m_DecoderStatus.position.offset = offset;
NotifyPosition();
}
}
return BLT_SUCCESS;
}
/*----------------------------------------------------------------------
| AlsaOutput_GetStatus
+---------------------------------------------------------------------*/
BLT_METHOD
AlsaOutput_GetStatus(BLT_OutputNode* _self,
BLT_OutputNodeStatus* status)
{
AlsaOutput* self = ATX_SELF(AlsaOutput, BLT_OutputNode);
snd_pcm_status_t* pcm_status;
snd_pcm_sframes_t delay = 0;
int io_result;
/* default values */
status->media_time.seconds = 0;
status->media_time.nanoseconds = 0;
status->flags = 0;
/* get the driver status */
snd_pcm_status_alloca_no_assert(&pcm_status);
io_result = snd_pcm_status(self->device_handle, pcm_status);
if (io_result != 0) {
return BLT_FAILURE;
}
delay = snd_pcm_status_get_delay(pcm_status);
if (delay == 0) {
/* workaround buggy alsa drivers */
io_result = snd_pcm_delay(self->device_handle, &delay);
if (io_result != 0) {
return BLT_FAILURE;
}
}
if (delay > 0 && self->media_type.sample_rate) {
ATX_UInt64 media_time_samples = (self->next_media_time *
(ATX_UInt64)self->media_type.sample_rate)/
(ATX_UInt64)1000000000;
ATX_UInt64 media_time_ns;
if (delay <= (snd_pcm_sframes_t)media_time_samples) {
media_time_samples -= delay;
} else {
media_time_samples = 0;
}
media_time_ns = (media_time_samples*(ATX_UInt64)1000000000)/self->media_type.sample_rate;
status->media_time = BLT_TimeStamp_FromNanos(media_time_ns);
} else {
status->media_time = BLT_TimeStamp_FromNanos(self->next_media_time);
}
/* return the computed media time */
ATX_LOG_FINEST_3("delay = %lld samples, input port time = %lld, media time = %lld", (ATX_UInt64)delay, self->next_media_time, BLT_TimeStamp_ToNanos(status->media_time));
return BLT_SUCCESS;
}
/*----------------------------------------------------------------------
| OsxAudioUnitsOutput_RenderCallback
+---------------------------------------------------------------------*/
static OSStatus
OsxAudioUnitsOutput_RenderCallback(void* inRefCon,
AudioUnitRenderActionFlags* ioActionFlags,
const AudioTimeStamp* inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList* ioData)
{
OsxAudioUnitsOutput* self = (OsxAudioUnitsOutput*)inRefCon;
ATX_ListItem* item;
unsigned int requested;
unsigned char* out;
ATX_Boolean timestamp_measured = ATX_FALSE;
BLT_COMPILER_UNUSED(ioActionFlags);
BLT_COMPILER_UNUSED(inTimeStamp);
BLT_COMPILER_UNUSED(inBusNumber);
BLT_COMPILER_UNUSED(inNumberFrames);
/* sanity check on the parameters */
if (ioData == NULL || ioData->mNumberBuffers == 0) return 0;
/* in case we have a strange request with more than one buffer, just return silence */
if (ioData->mNumberBuffers != 1) {
unsigned int i;
ATX_LOG_FINEST_1("strange request with %d buffers",
(int)ioData->mNumberBuffers);
for (i=0; i<ioData->mNumberBuffers; i++) {
ATX_SetMemory(ioData->mBuffers[i].mData, 0, ioData->mBuffers[i].mDataByteSize);
}
return 0;
}
/* init local variables */
requested = ioData->mBuffers[0].mDataByteSize;
out = (unsigned char*)ioData->mBuffers[0].mData;
ATX_LOG_FINEST_2("request for %d bytes, %d frames", (int)requested, (int)inNumberFrames);
/* lock the packet queue */
pthread_mutex_lock(&self->lock);
/* return now if we're paused */
//if (self->paused) goto end;
/* abort early if we have no packets */
if (ATX_List_GetItemCount(self->packet_queue) == 0) goto end;
/* fill as much as we can */
while (requested && (item = ATX_List_GetFirstItem(self->packet_queue))) {
BLT_MediaPacket* packet = ATX_ListItem_GetData(item);
const BLT_PcmMediaType* media_type;
BLT_Size payload_size;
BLT_Size chunk_size;
BLT_TimeStamp chunk_duration;
BLT_TimeStamp packet_ts;
unsigned int bytes_per_frame;
unsigned int sample_rate;
/* get the packet info */
BLT_MediaPacket_GetMediaType(packet, (const BLT_MediaType**)&media_type);
packet_ts = BLT_MediaPacket_GetTimeStamp(packet);
bytes_per_frame = media_type->channel_count*media_type->bits_per_sample/8;
sample_rate = media_type->sample_rate;
/* record the timestamp if we have not already done so */
if (!timestamp_measured) {
self->media_time_snapshot.rendered_packet_ts = packet_ts;
self->media_time_snapshot.rendered_host_time =
AudioConvertHostTimeToNanos(AudioGetCurrentHostTime());
BLT_TimeStamp_Set(self->media_time_snapshot.rendered_duration, 0, 0);
timestamp_measured = ATX_TRUE;
ATX_LOG_FINEST_2("rendered TS: packet ts=%lld, host ts=%lld",
BLT_TimeStamp_ToNanos(packet_ts),
self->media_time_snapshot.rendered_host_time);
}
/* compute how much to copy from this packet */
payload_size = BLT_MediaPacket_GetPayloadSize(packet);
if (payload_size <= requested) {
/* copy the entire payload and remove the packet from the queue */
chunk_size = payload_size;
ATX_CopyMemory(out, BLT_MediaPacket_GetPayloadBuffer(packet), chunk_size);
ATX_List_RemoveItem(self->packet_queue, item);
packet = NULL;
media_type = NULL;
ATX_LOG_FINER_1("media packet fully consumed, %d left in queue",
ATX_List_GetItemCount(self->packet_queue));
} else {
/* only copy a portion of the payload */
chunk_size = requested;
ATX_CopyMemory(out, BLT_MediaPacket_GetPayloadBuffer(packet), chunk_size);
}
/* update the counters */
requested -= chunk_size;
out += chunk_size;
/* update the media time snapshot */
if (bytes_per_frame) {
unsigned int frames_in_chunk = chunk_size/bytes_per_frame;
chunk_duration = BLT_TimeStamp_FromSamples(frames_in_chunk, sample_rate);
} else {
BLT_TimeStamp_Set(chunk_duration, 0, 0);
}
self->media_time_snapshot.rendered_duration =
BLT_TimeStamp_Add(self->media_time_snapshot.rendered_duration, chunk_duration);
/* update the packet unless we're done with it */
if (packet) {
/* update the packet offset and timestamp */
BLT_MediaPacket_SetPayloadOffset(packet, BLT_MediaPacket_GetPayloadOffset(packet)+chunk_size);
BLT_MediaPacket_SetTimeStamp(packet, BLT_TimeStamp_Add(packet_ts, chunk_duration));
}
}
end:
/* fill whatever is left with silence */
if (requested) {
ATX_LOG_FINEST_1("filling with %d bytes of silence", requested);
ATX_SetMemory(out, 0, requested);
}
pthread_mutex_unlock(&self->lock);
return 0;
}
