1 files changed, 88 insertions, 0 deletions
diff --git a/Src/pcm/avi_pcm_decoder.cpp b/Src/pcm/avi_pcm_decoder.cpp
new file mode 100644
index 00000000..d3e4ba73
--- /dev/null
+++ b/Src/pcm/avi_pcm_decoder.cpp
@@ -0,0 +1,88 @@
+#include "avi_pcm_decoder.h"
+#include "avi_alaw_decoder.h"
+#include "avi_ulaw_decoder.h"
+
+int AVIDecoder::CreateAudioDecoder(const nsavi::AVIH *avi_header, 
+																	 const nsavi::STRH *stream_header, const nsavi::STRF *stream_format, const nsavi::STRD *stream_data, 
+																	 unsigned int preferred_bits, unsigned int max_channels, bool floating_point, 
+																	 ifc_aviaudiodecoder **decoder)
+{
+	nsavi::audio_format *waveformat = (nsavi::audio_format *)stream_format;
+
+	if (waveformat->format == nsavi::audio_format_pcm		|| waveformat->format == nsavi::audio_format_extensible)
+	{
+		*decoder = new AVIPCMDecoder(waveformat);
+		return CREATEDECODER_SUCCESS;
+	}
+	else if (waveformat->format == nsavi::audio_format_alaw)
+	{
+			*decoder = new AVIALawDecoder(waveformat);
+		return CREATEDECODER_SUCCESS;
+	}
+		else if (waveformat->format == nsavi::audio_format_ulaw)
+	{
+			*decoder = new AVIULawDecoder(waveformat);
+		return CREATEDECODER_SUCCESS;
+	}
+
+	return CREATEDECODER_NOT_MINE;
+
+}
+
+#define CBCLASS AVIDecoder
+START_DISPATCH;
+CB(CREATE_AUDIO_DECODER, CreateAudioDecoder)
+END_DISPATCH;
+#undef CBCLASS
+
+AVIPCMDecoder::AVIPCMDecoder(const nsavi::audio_format *waveformat) : waveformat(waveformat)
+{
+}
+
+int AVIPCMDecoder::OutputFrameSize(size_t *frame_size)
+{
+	*frame_size = waveformat->block_align; // TODO
+	return AVI_SUCCESS;
+}
+
+int AVIPCMDecoder::GetOutputProperties(unsigned int *sampleRate, unsigned int *channels, unsigned int *bitsPerSample, bool *isFloat)
+{
+	if (waveformat)
+	{
+		*sampleRate = waveformat->sample_rate;
+		*channels = waveformat->channels;
+		*bitsPerSample = waveformat->bits_per_sample;
+		*isFloat = false; // TODO
+		return AVI_SUCCESS;
+	}
+	else
+	{
+		return AVI_FAILURE;
+	}
+}
+
+int AVIPCMDecoder::DecodeChunk(uint16_t type, void **inputBuffer, size_t *inputBufferBytes, void *outputBuffer, size_t *outputBufferBytes)
+{
+	size_t copy_size = min(*inputBufferBytes, *outputBufferBytes);
+	int remainder = copy_size % waveformat->block_align;
+	copy_size -= remainder;
+	memcpy(outputBuffer, *inputBuffer, copy_size);
+	*inputBuffer = (uint8_t *)(*inputBuffer) + copy_size;
+	*inputBufferBytes = *inputBufferBytes - copy_size;
+	*outputBufferBytes = copy_size;
+	return AVI_SUCCESS;
+}
+
+void AVIPCMDecoder::Close()
+{
+	delete this;
+}
+
+#define CBCLASS AVIPCMDecoder
+START_DISPATCH;
+CB(OUTPUT_FRAME_SIZE, OutputFrameSize)
+CB(GET_OUTPUT_PROPERTIES, GetOutputProperties)
+CB(DECODE_CHUNK, DecodeChunk)
+VCB(CLOSE, Close)
+END_DISPATCH;
+#undef CBCLASS
+\ No newline at end of file