From a43fef70a9b13d35d358d6ba44c4e1e884bbbc3e Mon Sep 17 00:00:00 2001
From: Alexey Yakovenko <wakeroid@gmail.com>
Date: Sun, 27 Sep 2009 16:18:02 +0200
Subject: wavpack float32 decoding

---
 plugins/wavpack/wavpack.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

(limited to 'plugins/wavpack')

diff --git a/plugins/wavpack/wavpack.c b/plugins/wavpack/wavpack.c
index 717bf2e5..85bbaaaa 100644
--- a/plugins/wavpack/wavpack.c
+++ b/plugins/wavpack/wavpack.c
@@ -72,7 +72,6 @@ wv_free (void) {
     memset (&wvctx, 0, sizeof (wvctx));
 }
 
-
 static int
 wv_read_int16 (char *bytes, int size) {
     int currentsample = WavpackGetSampleIndex (wvctx.ctx);
@@ -100,6 +99,34 @@ wv_read_int16 (char *bytes, int size) {
     return size;
 }
 
+static int
+wv_read_float32 (char *bytes, int size) {
+    int currentsample = WavpackGetSampleIndex (wvctx.ctx);
+    if (size / (4 * plugin.info.channels) + currentsample > wvctx.endsample) {
+        size = (wvctx.endsample - currentsample + 1) * 4 * plugin.info.channels;
+        trace ("wv: size truncated to %d bytes, cursample=%d, endsample=%d\n", size, currentsample, wvctx.endsample);
+        if (size <= 0) {
+            return 0;
+        }
+    }
+    int32_t buffer[size/4];
+    int nchannels = WavpackGetNumChannels (wvctx.ctx);
+    int n = WavpackUnpackSamples (wvctx.ctx, buffer, size/(4*nchannels));
+    size = n * 4 * nchannels;
+    // convert to int16
+    int32_t *p = buffer;
+    n *= nchannels;
+    float mul = 1.f/ ((1 << (plugin.info.bps-1))-1);
+    while (n > 0) {
+        *((float *)bytes) = (*p) * mul;
+        bytes += sizeof (float);
+        p++;
+        n--;
+    }
+    plugin.info.readpos = (float)(WavpackGetSampleIndex (wvctx.ctx)-wvctx.startsample)/WavpackGetSampleRate (wvctx.ctx);
+    return size;
+}
+
 static int
 wv_seek_sample (int sample) {
     WavpackSeekSample (wvctx.ctx, sample + wvctx.startsample);
@@ -171,7 +198,7 @@ static DB_decoder_t plugin = {
     .init = wv_init,
     .free = wv_free,
     .read_int16 = wv_read_int16,
-//    .read_float32 = wv_read_float32,
+    .read_float32 = wv_read_float32,
     .seek = wv_seek,
     .seek_sample = wv_seek_sample,
     .insert = wv_insert,
-- 
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