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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.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31367 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2011-12-19 19:46:10 +00:00
parent 9b920734be
commit 07405841c6
3 changed files with 36 additions and 14 deletions
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27
apps/codecs/flac.c
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@ -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;