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change ring buffer to wait for full frames

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This commit is contained in:
Stephen Birarda 2013-02-07 15:04:49 -08:00
parent a5eaf09d73
commit 0f03585a22
1 changed files with 27 additions and 67 deletions
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94
Source/Audio.cpp
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@ -29,7 +29,7 @@ const short RING_BUFFER_FRAMES = 10;
const short RING_BUFFER_SIZE_SAMPLES = RING_BUFFER_FRAMES * BUFFER_LENGTH_SAMPLES;
const int SAMPLE_RATE = 22050;
const float JITTER_BUFFER_LENGTH_MSECS = 26.0;
const float JITTER_BUFFER_LENGTH_MSECS = 10.0;
const short JITTER_BUFFER_SAMPLES = JITTER_BUFFER_LENGTH_MSECS * (SAMPLE_RATE / 1000.0);
const short NUM_AUDIO_SOURCES = 2;
@ -105,31 +105,21 @@ int audioCallback (const void *inputBuffer,
if (ringBuffer->endOfLastWrite != NULL) {
// play whatever we have in the audio buffer
short silentTail = 0;
// if the end of the last write to the ring is in front of the current output pointer
// AND the difference between the two is less than a full output buffer
// we need to add some silence after the audio data, to avoid replaying old data
if ((ringBuffer->endOfLastWrite - ringBuffer->buffer) > (ringBuffer->nextOutput - ringBuffer->buffer)
&& (ringBuffer->endOfLastWrite - ringBuffer->nextOutput) < BUFFER_LENGTH_SAMPLES) {
silentTail = BUFFER_LENGTH_SAMPLES - (ringBuffer->endOfLastWrite - ringBuffer->nextOutput);
}
// no sample overlap, either a direct copy of the audio data, or a copy with some appended silence
memcpy(queueBuffer, ringBuffer->nextOutput, (BUFFER_LENGTH_SAMPLES - silentTail) * sizeof(int16_t));
ringBuffer->nextOutput += BUFFER_LENGTH_SAMPLES;
if (ringBuffer->nextOutput == ringBuffer->buffer + RING_BUFFER_SIZE_SAMPLES) {
ringBuffer->nextOutput = ringBuffer->buffer;
}
if (ringBuffer->diffLastWriteNextOutput() < BUFFER_LENGTH_SAMPLES) {
if (ringBuffer->diffLastWriteNextOutput() < PACKET_LENGTH_SAMPLES + JITTER_BUFFER_SAMPLES) {
starve_counter++;
printf("Starved #%d\n", starve_counter);
data->wasStarved = 10; // Frames to render the indication that the system was starved.
ringBuffer->endOfLastWrite = NULL;
data->wasStarved = 10; // Frames to render the indication that the system was starved.
} else {
// play whatever we have in the audio buffer
// no sample overlap, either a direct copy of the audio data, or a copy with some appended silence
memcpy(queueBuffer, ringBuffer->nextOutput, BUFFER_LENGTH_BYTES);
ringBuffer->nextOutput += BUFFER_LENGTH_SAMPLES;
if (ringBuffer->nextOutput == ringBuffer->buffer + RING_BUFFER_SIZE_SAMPLES) {
ringBuffer->nextOutput = ringBuffer->buffer;
}
}
}
@ -255,54 +245,24 @@ void *receiveAudioViaUDP(void *args) {
AudioRingBuffer *ringBuffer = sharedAudioData->ringBuffer;
int16_t *copyToPointer;
bool needsJitterBuffer = ringBuffer->endOfLastWrite == NULL;
short bufferSampleOverlap = 0;
if (!needsJitterBuffer && ringBuffer->diffLastWriteNextOutput() > RING_BUFFER_SIZE_SAMPLES - PACKET_LENGTH_SAMPLES) {
bool ringBufferReset = ringBuffer->endOfLastWrite == NULL;
if (!ringBufferReset && ringBuffer->diffLastWriteNextOutput() > RING_BUFFER_SIZE_SAMPLES - PACKET_LENGTH_SAMPLES) {
std::cout << "D: " << ringBuffer->diffLastWriteNextOutput() << "\n";
std::cout << "Full\n";
needsJitterBuffer = true;
ringBufferReset = true;
}
if (needsJitterBuffer) {
// we'll need a jitter buffer
// reset the ring buffer and write
copyToPointer = ringBuffer->buffer;
//std::cout << "Writing jitter buffer\n";
} else {
copyToPointer = ringBuffer->endOfLastWrite;
// check for possibility of overlap
bufferSampleOverlap = ringBuffer->bufferOverlap(copyToPointer, PACKET_LENGTH_SAMPLES);
if (ringBufferReset || ringBuffer->endOfLastWrite == ringBuffer->buffer + RING_BUFFER_SIZE_SAMPLES) {
// reset the ring buffer and write from beginning
ringBuffer->endOfLastWrite = ringBuffer->buffer;
}
if (!bufferSampleOverlap) {
if (needsJitterBuffer) {
// we need to inject a jitter buffer
// add silence for jitter buffer and then the received packet
memset(copyToPointer, 0, JITTER_BUFFER_SAMPLES * sizeof(int16_t));
memcpy(copyToPointer + JITTER_BUFFER_SAMPLES, receivedData, PACKET_LENGTH_BYTES);
// the end of the write is the pointer to the buffer + packet + jitter buffer
ringBuffer->endOfLastWrite = ringBuffer->buffer + PACKET_LENGTH_SAMPLES + JITTER_BUFFER_SAMPLES;
ringBuffer->nextOutput = ringBuffer->buffer;
} else {
// no jitter buffer, no overlap
// just copy the recieved data to the right spot and then add packet length to previous pointer
memcpy(copyToPointer, receivedData, PACKET_LENGTH_BYTES);
ringBuffer->endOfLastWrite += PACKET_LENGTH_SAMPLES;
}
} else {
// no jitter buffer, but overlap
// copy to the end, and then from the begining to the overlap
memcpy(copyToPointer, receivedData, (PACKET_LENGTH_SAMPLES - bufferSampleOverlap) * sizeof(int16_t));
memcpy(ringBuffer->buffer, receivedData + (PACKET_LENGTH_SAMPLES - bufferSampleOverlap), bufferSampleOverlap * sizeof(int16_t));
// the end of the write is the amount of overlap
ringBuffer->endOfLastWrite = ringBuffer->buffer + bufferSampleOverlap;
}
int16_t *copyToPointer = ringBuffer->endOfLastWrite;
// just copy the recieved data to the right spot and then add packet length to previous pointer
memcpy(copyToPointer, receivedData, PACKET_LENGTH_BYTES);
ringBuffer->endOfLastWrite += PACKET_LENGTH_SAMPLES;
if (LOG_SAMPLE_DELAY) {
gettimeofday(&previousReceiveTime, NULL);