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GOTO POWER. Improve crossfade performance, and cleanliness, and termination conditions. Make consistent insert vs. request/complete types of buffering.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9800 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Brandon Low 2006-04-25 16:12:43 +00:00
parent 1f4a63441a
commit 08cdc439ce
1 changed files with 23 additions and 15 deletions
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38
apps/pcmbuf.c
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@ -142,10 +142,10 @@ static void pcmbuf_callback(unsigned char** start, size_t* size)
pcmbuf_write_end->link = pcmbuf_current; pcmbuf_write_end->link = pcmbuf_current;
pcmbuf_write_end = pcmbuf_current; pcmbuf_write_end = pcmbuf_current;
/* If we've read up to the mix chunk while it's still mixing there */ /* If we've read over the mix chunk while it's still mixing there */
if (pcmbuf_current == pcmbuf_mix_chunk) if (pcmbuf_current == pcmbuf_mix_chunk)
pcmbuf_mix_chunk = NULL; pcmbuf_mix_chunk = NULL;
/* If we've read up to the crossfade chunk while it's still fading */ /* If we've read over the crossfade chunk while it's still fading */
if (pcmbuf_current == crossfade_chunk) if (pcmbuf_current == crossfade_chunk)
crossfade_chunk = NULL; crossfade_chunk = NULL;
} }
@ -677,6 +677,10 @@ static void flush_crossfade(char *buf, size_t length)
fade_rem = crossfade_fade_mix(factor, buf, fade_rem); fade_rem = crossfade_fade_mix(factor, buf, fade_rem);
length -= fade_total - fade_rem; length -= fade_total - fade_rem;
buf += fade_total - fade_rem; buf += fade_total - fade_rem;
if (!length)
return;
if (!fade_rem)
goto fade_done;
} }
samples = fade_rem / 2; samples = fade_rem / 2;
@ -690,23 +694,21 @@ static void flush_crossfade(char *buf, size_t length)
} }
} }
fade_done:
if (crossfade_chunk) if (crossfade_chunk)
{ {
/* Mix the data */ /* Mix the data */
size_t mix_total = length; size_t mix_total = length;
length = crossfade_mix(buf, length); length = crossfade_mix(buf, length);
buf += mix_total - length; buf += mix_total - length;
if (!length)
return;
} }
else if (!crossfade_fade_in_rem)
crossfade_active = false;
if (length) /* Flush samples to the buffer */
{ while (!prepare_insert(length))
/* Flush samples to the buffer */ sleep(1);
while (!prepare_insert(length)) pcmbuf_flush_buffer(buf, length);
sleep(1);
pcmbuf_flush_buffer(buf, length);
}
} }
} }
@ -806,7 +808,11 @@ bool pcmbuf_is_crossfade_active(void)
void pcmbuf_write_complete(size_t length) void pcmbuf_write_complete(size_t length)
{ {
if (crossfade_active) if (crossfade_active)
{
flush_crossfade(fadebuf, length); flush_crossfade(fadebuf, length);
if (!(crossfade_fade_in_rem || crossfade_chunk))
crossfade_active = false;
}
else else
{ {
audiobuffer_fillpos += length; audiobuffer_fillpos += length;
@ -818,14 +824,16 @@ void pcmbuf_write_complete(size_t length)
bool pcmbuf_insert_buffer(char *buf, size_t length) bool pcmbuf_insert_buffer(char *buf, size_t length)
{ {
if (!prepare_insert(length)) if (crossfade_active)
return false; {
if (crossfade_active) {
flush_crossfade(buf, length); flush_crossfade(buf, length);
if (!(crossfade_fade_in_rem || crossfade_chunk))
crossfade_active = false;
} }
else else
{ {
if (!prepare_insert(length))
return false;
pcmbuf_flush_buffer(buf, length); pcmbuf_flush_buffer(buf, length);
} }
return true; return true;