Merge pull request #5 from WinampDesktop/community

Merge to main

1 files changed, 95 insertions, 0 deletions

diff --git a/Src/pcm/avi_alaw_decoder.cpp b/Src/pcm/avi_alaw_decoder.cpp
new file mode 100644
index 00000000..51b8771d
--- /dev/null
+++ b/Src/pcm/avi_alaw_decoder.cpp
@@ -0,0 +1,95 @@
+#include "avi_alaw_decoder.h"
+
+static int16_t ALawDecompressTable[256] =
+{
+     -5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,
+     -7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,
+     -2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,
+     -3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,
+     -22016,-20992,-24064,-23040,-17920,-16896,-19968,-18944,
+     -30208,-29184,-32256,-31232,-26112,-25088,-28160,-27136,
+     -11008,-10496,-12032,-11520,-8960, -8448, -9984, -9472,
+     -15104,-14592,-16128,-15616,-13056,-12544,-14080,-13568,
+     -344,  -328,  -376,  -360,  -280,  -264,  -312,  -296,
+     -472,  -456,  -504,  -488,  -408,  -392,  -440,  -424,
+     -88,   -72,   -120,  -104,  -24,   -8,    -56,   -40,
+     -216,  -200,  -248,  -232,  -152,  -136,  -184,  -168,
+     -1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,
+     -1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,
+     -688,  -656,  -752,  -720,  -560,  -528,  -624,  -592,
+     -944,  -912,  -1008, -976,  -816,  -784,  -880,  -848,
+      5504,  5248,  6016,  5760,  4480,  4224,  4992,  4736,
+      7552,  7296,  8064,  7808,  6528,  6272,  7040,  6784,
+      2752,  2624,  3008,  2880,  2240,  2112,  2496,  2368,
+      3776,  3648,  4032,  3904,  3264,  3136,  3520,  3392,
+      22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,
+      30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,
+      11008, 10496, 12032, 11520, 8960,  8448,  9984,  9472,
+      15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,
+      344,   328,   376,   360,   280,   264,   312,   296,
+      472,   456,   504,   488,   408,   392,   440,   424,
+      88,    72,   120,   104,    24,     8,    56,    40,
+      216,   200,   248,   232,   152,   136,   184,   168,
+      1376,  1312,  1504,  1440,  1120,  1056,  1248,  1184,
+      1888,  1824,  2016,  1952,  1632,  1568,  1760,  1696,
+      688,   656,   752,   720,   560,   528,   624,   592,
+      944,   912,  1008,   976,   816,   784,   880,   848
+};
+
+AVIALawDecoder::AVIALawDecoder(const nsavi::audio_format *waveformat) : waveformat(waveformat)
+{
+}
+
+int AVIALawDecoder::OutputFrameSize(size_t *frame_size)
+{
+	*frame_size = waveformat->block_align; // TODO
+	return AVI_SUCCESS;
+}
+
+int AVIALawDecoder::GetOutputProperties(unsigned int *sampleRate, unsigned int *channels, unsigned int *bitsPerSample, bool *isFloat)
+{
+	if (waveformat)
+	{
+		*sampleRate = waveformat->sample_rate;
+		*channels = waveformat->channels;
+		*bitsPerSample = 16;
+		*isFloat = false; // TODO
+		return AVI_SUCCESS;
+	}
+	else
+	{
+		return AVI_FAILURE;
+	}
+}
+
+int AVIALawDecoder::DecodeChunk(uint16_t type, void **inputBuffer, size_t *inputBufferBytes, void *outputBuffer, size_t *outputBufferBytes)
+{
+size_t num_samples = min(*inputBufferBytes, *outputBufferBytes / 2);
+	const uint8_t *in = (const uint8_t *)*inputBuffer;
+
+	int16_t *out = (int16_t *)outputBuffer;
+	for (size_t i=0;i!=num_samples;i++)
+	{
+		out[i] = ALawDecompressTable[in[i]];
+	}
+
+	*outputBufferBytes = num_samples * 2;
+	*inputBufferBytes -= num_samples;
+	*inputBuffer = (uint8_t *)inputBuffer + num_samples;
+		
+	return AVI_SUCCESS;
+}
+
+void AVIALawDecoder::Close()
+{
+	delete this;
+}
+
+#define CBCLASS AVIALawDecoder
+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