From 07405841c67ac29b2a75f20f8732b34064a28cff Mon Sep 17 00:00:00 2001
From: Andree Buschmann <AndreeBuschmann@t-online.de>
Date: Mon, 19 Dec 2011 19:46:10 +0000
Subject: FS#12463: Improve performance for multichannel FLAC decoding. Speeds
 up decoding by 3 MHz on PP5022, 6-7 MHz on S5L870x and 11-12 MHz on MCF5250.
 5.1-88kHz-files still do not decode in realtime on Coldfire and PP502x.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31367 a1c6a512-1295-4272-9138-f99709370657
---
 apps/codecs/flac.c                    | 27 +++++++++++++++++----------
 apps/codecs/libffmpegFLAC/bitstream.h | 22 ++++++++++++++++++----
 apps/codecs/libffmpegFLAC/decoder.c   |  1 +
 3 files changed, 36 insertions(+), 14 deletions(-)

diff --git a/apps/codecs/flac.c b/apps/codecs/flac.c
index b9f6654f92..e10403819c 100644
--- a/apps/codecs/flac.c
+++ b/apps/codecs/flac.c
@@ -24,10 +24,15 @@
 
 CODEC_HEADER
 
+static FLACContext fc IBSS_ATTR_FLAC;
+
 /* The output buffers containing the decoded samples (channels 0 and 1) */
-static int32_t decoded0[MAX_BLOCKSIZE] IBSS_ATTR_FLAC_DECODED0;
-static int32_t decoded1[MAX_BLOCKSIZE] IBSS_ATTR;
-static int32_t dummydec[4][MAX_BLOCKSIZE];
+static int32_t decoded0[MAX_BLOCKSIZE] IBSS_ATTR_FLAC;
+static int32_t decoded1[MAX_BLOCKSIZE] IBSS_ATTR_FLAC;
+static int32_t decoded2[MAX_BLOCKSIZE] IBSS_ATTR_FLAC_LARGE_IRAM;
+static int32_t decoded3[MAX_BLOCKSIZE] IBSS_ATTR_FLAC_LARGE_IRAM;
+static int32_t decoded4[MAX_BLOCKSIZE] IBSS_ATTR_FLAC_XLARGE_IRAM;
+static int32_t decoded5[MAX_BLOCKSIZE] IBSS_ATTR_FLAC_XLARGE_IRAM;
 
 #define MAX_SUPPORTED_SEEKTABLE_SIZE 5000
 
@@ -81,7 +86,6 @@ static bool flac_init(FLACContext* fc, int first_frame_offset)
     uint16_t blocksize;
     int endofmetadata=0;
     uint32_t blocklength;
-    int ch;
 
     ci->memset(fc,0,sizeof(FLACContext));
     nseekpoints=0;
@@ -91,15 +95,19 @@ static bool flac_init(FLACContext* fc, int first_frame_offset)
     /* Reset sample buffers */
     memset(decoded0, 0, sizeof(decoded0));
     memset(decoded1, 0, sizeof(decoded1));
-    memset(dummydec, 0, sizeof(dummydec));
+    memset(decoded2, 0, sizeof(decoded2));
+    memset(decoded3, 0, sizeof(decoded3));
+    memset(decoded4, 0, sizeof(decoded4));
+    memset(decoded5, 0, sizeof(decoded5));
     
     /* Set sample buffers in decoder structure */
     fc->decoded[0] = decoded0;
     fc->decoded[1] = decoded1;
-    for (ch=2; ch<MAX_CHANNELS; ++ch)
-    {
-        fc->decoded[ch] = dummydec[ch-2];
-    }
+    fc->decoded[2] = decoded2;
+    fc->decoded[3] = decoded3;
+    fc->decoded[4] = decoded4;
+    fc->decoded[5] = decoded5;
+
 
     /* Skip any foreign tags at start of file */
     ci->seek_buffer(first_frame_offset);
@@ -447,7 +455,6 @@ enum codec_status codec_main(enum codec_entry_call_reason reason)
 enum codec_status codec_run(void)
 {
     int8_t *buf;
-    FLACContext fc;
     uint32_t samplesdone;
     uint32_t elapsedtime;
     size_t bytesleft;
diff --git a/apps/codecs/libffmpegFLAC/bitstream.h b/apps/codecs/libffmpegFLAC/bitstream.h
index 1333b9f4b8..5fc3460c8e 100644
--- a/apps/codecs/libffmpegFLAC/bitstream.h
+++ b/apps/codecs/libffmpegFLAC/bitstream.h
@@ -19,12 +19,26 @@
   #define ICODE_ATTR
 #endif
 
-#ifndef ICODE_ATTR_FLAC
+#if (CONFIG_CPU == MCF5250) || (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024)
 #define ICODE_ATTR_FLAC ICODE_ATTR
-#endif
+#define IBSS_ATTR_FLAC  IBSS_ATTR
+/* Enough IRAM to move additional data to it. */
+#define IBSS_ATTR_FLAC_LARGE_IRAM   IBSS_ATTR
+#define IBSS_ATTR_FLAC_XLARGE_IRAM
+
+#elif defined(CPU_S5L870X)
+#define ICODE_ATTR_FLAC ICODE_ATTR
+#define IBSS_ATTR_FLAC  IBSS_ATTR
+/* Enough IRAM to move even more additional data to it. */
+#define IBSS_ATTR_FLAC_LARGE_IRAM   IBSS_ATTR
+#define IBSS_ATTR_FLAC_XLARGE_IRAM  IBSS_ATTR
 
-#ifndef IBSS_ATTR_FLAC_DECODED0
-#define IBSS_ATTR_FLAC_DECODED0 IBSS_ATTR
+#else
+#define ICODE_ATTR_FLAC ICODE_ATTR
+#define IBSS_ATTR_FLAC  IBSS_ATTR
+/* Not enough IRAM available. */
+#define IBSS_ATTR_FLAC_LARGE_IRAM
+#define IBSS_ATTR_FLAC_XLARGE_IRAM
 #endif
 
 /* Endian conversion routines for standalone compilation */
diff --git a/apps/codecs/libffmpegFLAC/decoder.c b/apps/codecs/libffmpegFLAC/decoder.c
index 1be5fbb6ef..2e92c4b90d 100644
--- a/apps/codecs/libffmpegFLAC/decoder.c
+++ b/apps/codecs/libffmpegFLAC/decoder.c
@@ -488,6 +488,7 @@ static int decode_frame(FLACContext *s,
     return 0;
 }
 
+static int flac_downmix(FLACContext *s) ICODE_ATTR_FLAC;
 static int flac_downmix(FLACContext *s)
 {
     int32_t *FL, *FR, *FC, *SB, *RL, *RR;
-- 
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