Sync to upstream libopus

Sync to commit bb4b6885a139644cf3ac14e7deda9f633ec2d93c

This brings in a bunch of optimizations to decode speed
and memory usage. Allocations are switched from using
the pseudostack to using the real stack. Enabled hacks
to reduce stack usage.

This should fix crashes on sansa clip, although some
files will not play due to failing allocations in the
codec buffer.

Speeds up decoding of the following test files:

                 H300 (cf)   C200 (arm7tdmi)  ipod classic (arm9e)
16 kbps (silk)   14.28 MHz   4.00 MHz         2.61 MHz
64 kbps (celt)   4.09 MHz    8.08 MHz         6.24 MHz
128 kbps (celt)  1.93 MHz    8.83 MHz         6.53 MHz

Change-Id: I851733a8a5824b61feb363a173091bc7e6629b58

1 files changed, 21 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libopus/opus.c b/lib/rbcodec/codecs/libopus/opus.c
index 989c6537cb..0526f8b414 100644
--- a/lib/rbcodec/codecs/libopus/opus.c
+++ b/lib/rbcodec/codecs/libopus/opus.c
@@ -168,6 +168,27 @@ static int parse_size(const unsigned char *data, opus_int32 len, opus_int16 *siz
    }
 }
 
+int opus_packet_get_samples_per_frame(const unsigned char *data,
+      opus_int32 Fs)
+{
+   int audiosize;
+   if (data[0]&0x80)
+   {
+      audiosize = ((data[0]>>3)&0x3);
+      audiosize = (Fs<<audiosize)/400;
+   } else if ((data[0]&0x60) == 0x60)
+   {
+      audiosize = (data[0]&0x08) ? Fs/50 : Fs/100;
+   } else {
+      audiosize = ((data[0]>>3)&0x3);
+      if (audiosize == 3)
+         audiosize = Fs*60/1000;
+      else
+         audiosize = (Fs<<audiosize)/100;
+   }
+   return audiosize;
+}
+
 int opus_packet_parse_impl(const unsigned char *data, opus_int32 len,
       int self_delimited, unsigned char *out_toc,
       const unsigned char *frames[48], opus_int16 size[48],