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opus add pseudo header and configurable options

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badaix 2019-11-03 17:37:04 +01:00
parent 3fea89a60b
commit 6cd3b7df67
4 changed files with 155 additions and 21 deletions
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77
client/decoder/opus_decoder.cpp
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@ -18,16 +18,21 @@
#include "opus_decoder.hpp"
#include "common/aixlog.hpp"
#include "common/snap_exception.hpp"
#include "common/str_compat.hpp"
#define ID_OPUS 0x4F505553
/// int: Number of samples per channel in the input signal.
/// This must be an Opus frame size for the encoder's sampling rate. For example, at 48 kHz the
/// permitted values are 120, 240, 480, 960, 1920, and 2880.
/// Passing in a duration of less than 10 ms (480 samples at 48 kHz) will prevent the encoder from using the LPC or hybrid modes.
static constexpr int const_max_frame_size = 2880;
OpusDecoder::OpusDecoder() : Decoder()
OpusDecoder::OpusDecoder() : Decoder(), dec_(nullptr)
{
int error;
dec_ = opus_decoder_create(48000, 2, &error); // fixme
if (error != 0)
{
LOG(ERROR) << "Failed to initialize opus decoder: " << error << '\n' << " Rate: " << 48000 << '\n' << " Channels: " << 2 << '\n';
}
pcm_.resize(120);
}
@ -40,32 +45,66 @@ OpusDecoder::~OpusDecoder()
bool OpusDecoder::decode(msg::PcmChunk* chunk)
{
size_t samples = 480;
// reserve space for decoded audio
if (pcm_.size() < samples * 2)
pcm_.resize(samples * 2);
int frame_size = 0;
while ((frame_size = opus_decode(dec_, (unsigned char*)chunk->payload, chunk->payloadSize, pcm_.data(), pcm_.size() / sample_format_.channels, 0)) ==
OPUS_BUFFER_TOO_SMALL)
{
if (pcm_.size() < const_max_frame_size * sample_format_.channels)
{
pcm_.resize(pcm_.size() * 2);
LOG(INFO) << "OPUS encoding buffer too small, resizing to " << pcm_.size() / sample_format_.channels << " samples per channel\n";
}
else
break;
}
// decode
int frame_size = opus_decode(dec_, (unsigned char*)chunk->payload, chunk->payloadSize, pcm_.data(), samples, 0);
if (frame_size < 0)
{
LOG(ERROR) << "Failed to decode chunk: " << frame_size << '\n' << " IN size: " << chunk->payloadSize << '\n' << " OUT size: " << samples * 4 << '\n';
LOG(ERROR) << "Failed to decode chunk: " << frame_size << '\n' << " IN size: " << chunk->payloadSize << '\n' << " OUT size: " << pcm_.size() << '\n';
return false;
}
else
{
LOG(DEBUG) << "Decoded chunk: size " << chunk->payloadSize << " bytes, decoded " << frame_size << " bytes" << '\n';
LOG(DEBUG) << "Decoded chunk: size " << chunk->payloadSize << " bytes, decoded " << frame_size << " samples" << '\n';
// copy encoded data to chunk
chunk->payloadSize = samples * 4;
chunk->payloadSize = frame_size * sample_format_.channels * sizeof(opus_int16);
chunk->payload = (char*)realloc(chunk->payload, chunk->payloadSize);
memcpy(chunk->payload, (char*)pcm_.data(), samples * 4);
memcpy(chunk->payload, (char*)pcm_.data(), chunk->payloadSize);
return true;
}
}
SampleFormat OpusDecoder::setHeader(msg::CodecHeader* /*chunk*/)
SampleFormat OpusDecoder::setHeader(msg::CodecHeader* chunk)
{
return {48000, 16, 2};
// decode the opus pseudo header
if (chunk->payloadSize < 12)
throw SnapException("OPUS header too small");
// decode the "opus id" magic number, this is our constant part that must match
uint32_t id_opus;
memcpy(&id_opus, chunk->payload, sizeof(id_opus));
if (SWAP_32(id_opus) != ID_OPUS)
throw SnapException("Not an Opus pseudo header");
// decode the sampleformat
uint32_t rate;
memcpy(&rate, chunk->payload + 4, sizeof(id_opus));
uint16_t bits;
memcpy(&bits, chunk->payload + 8, sizeof(bits));
uint16_t channels;
memcpy(&channels, chunk->payload + 10, sizeof(channels));
sample_format_.setFormat(SWAP_32(rate), SWAP_16(bits), SWAP_16(channels));
LOG(INFO) << "Opus sampleformat: " << sample_format_.getFormat() << "\n";
// create the decoder
int error;
dec_ = opus_decoder_create(sample_format_.rate, sample_format_.channels, &error);
if (error != 0)
throw SnapException("Failed to initialize Opus decoder: " + cpt::to_string(error));
return sample_format_;
}