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Optimizations to the FLAC-codec buffer requesting to eliminate the

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need of extra copying.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7685 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Miika Pekkarinen 2005-10-30 07:38:52 +00:00
parent a3ed62b36f
commit 169c935c24
1 changed files with 7 additions and 12 deletions
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19
apps/codecs/flac.c
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@ -210,12 +210,11 @@ bool flac_seek(FLACContext* fc, uint32_t newsample) {
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api* api)
{
size_t n;
static int8_t buf[MAX_FRAMESIZE];
int8_t *buf;
FLACContext fc;
uint32_t samplesdone;
uint32_t elapsedtime;
int bytesleft;
long bytesleft;
int consumed;
int res;
int frame;
@ -246,7 +245,7 @@ enum codec_status codec_start(struct codec_api* api)
return CODEC_ERROR;
}
while (!ci->taginfo_ready)
while (!*ci->taginfo_ready)
ci->yield();
ci->configure(DSP_SET_FREQUENCY, (long *)(ci->id3->frequency));
@ -254,7 +253,7 @@ enum codec_status codec_start(struct codec_api* api)
/* The main decoding loop */
samplesdone=0;
frame=0;
bytesleft=ci->read_filebuf(buf,sizeof(buf));
buf = ci->request_buffer(&bytesleft, MAX_FRAMESIZE);
while (bytesleft) {
ci->yield();
if (ci->stop_codec || ci->reload_codec) {
@ -265,7 +264,7 @@ enum codec_status codec_start(struct codec_api* api)
if (ci->seek_time) {
if (flac_seek(&fc,(ci->seek_time/20) * (ci->id3->frequency/50))) {
/* Refill the input buffer */
bytesleft=ci->read_filebuf(buf,sizeof(buf));
buf = ci->request_buffer(&bytesleft, MAX_FRAMESIZE);
}
ci->seek_time = 0;
}
@ -289,13 +288,9 @@ enum codec_status codec_start(struct codec_api* api)
elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
ci->set_elapsed(elapsedtime);
memmove(buf,&buf[consumed],bytesleft-consumed);
bytesleft-=consumed;
ci->advance_buffer(consumed);
n=ci->read_filebuf(&buf[bytesleft],sizeof(buf)-bytesleft);
if (n > 0) {
bytesleft+=n;
}
buf = ci->request_buffer(&bytesleft, MAX_FRAMESIZE);
}
LOGF("FLAC: Decoded %d samples\n",samplesdone);