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pcmbuf: moved some functions around, no functional changes yet

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23565 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jeffrey Goode 2009-11-08 04:27:27 +00:00
parent 487d088e12
commit b6f15f2c95
2 changed files with 79 additions and 79 deletions
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156
apps/pcmbuf.c
View file

@ -41,14 +41,6 @@
#include "dsp.h"
#include "thread.h"
/* Clip sample to signed 16 bit range */
static inline int32_t clip_sample_16(int32_t sample)
{
if ((int16_t)sample != sample)
sample = 0x7fff ^ (sample >> 31);
return sample;
}
#define PCMBUF_TARGET_CHUNK 32768 /* This is the target fill size of chunks
on the pcm buffer */
#define PCMBUF_MINAVG_CHUNK 24576 /* This is the minimum average size of
@ -142,7 +134,6 @@ extern unsigned int codec_thread_id;
#define LOW_DATA(quarter_secs) \
(pcmbuf_unplayed_bytes < NATIVE_FREQUENCY * quarter_secs)
static bool pcmbuf_flush_fillpos(void);
static void pcmbuf_finish_track_change(void);
#ifdef HAVE_CROSSFADE
static void crossfade_start(void);
@ -152,6 +143,7 @@ static bool pcmbuf_crossfade_init(bool manual_skip);
static void pcmbuf_finish_crossfade_enable(void);
static bool pcmbuf_is_crossfade_enabled(void);
/**************************************/
/* define this to show detailed pcmbufdesc usage information on the sim console */
@ -253,6 +245,75 @@ static void pcmbuf_under_watermark(bool under)
}
}
/* This is really just part of pcmbuf_flush_fillpos, but is easier to keep
* in a separate function for the moment */
static inline void pcmbuf_add_chunk(void)
{
register size_t size = audiobuffer_fillpos;
/* Grab the next description to write, and change the write pointer */
register struct pcmbufdesc *pcmbuf_current = pcmbuf_write;
pcmbuf_write = pcmbuf_current->link;
/* Fill in the values in the new buffer chunk */
pcmbuf_current->addr = &audiobuffer[audiobuffer_pos];
pcmbuf_current->size = size;
pcmbuf_current->end_of_track = end_of_track;
pcmbuf_current->link = NULL;
end_of_track = false; /* This is single use only */
if (pcmbuf_read != NULL) {
if (pcmbuf_flush)
{
pcmbuf_write_end->link = pcmbuf_read->link;
pcmbuf_read->link = pcmbuf_current;
while (pcmbuf_write_end->link)
{
pcmbuf_write_end = pcmbuf_write_end->link;
pcmbuf_unplayed_bytes -= pcmbuf_write_end->size;
}
pcmbuf_flush = false;
}
/* If there is already a read buffer setup, add to it */
else
pcmbuf_read_end->link = pcmbuf_current;
} else {
/* Otherwise create the buffer */
pcmbuf_read = pcmbuf_current;
}
/* This is now the last buffer to read */
pcmbuf_read_end = pcmbuf_current;
/* Update bytes counters */
pcmbuf_unplayed_bytes += size;
audiobuffer_pos += size;
if (audiobuffer_pos >= pcmbuf_size)
audiobuffer_pos -= pcmbuf_size;
audiobuffer_fillpos = 0;
DISPLAY_DESC("add_chunk");
}
/**
* Commit samples waiting to the pcm buffer.
*/
static bool pcmbuf_flush_fillpos(void)
{
if (audiobuffer_fillpos) {
/* Never use the last buffer descriptor */
while (pcmbuf_write == pcmbuf_write_end) {
/* If this happens, something is being stupid */
if (!pcm_is_playing()) {
logf("pcmbuf_flush_fillpos error");
pcmbuf_play_start();
}
/* Let approximately one chunk of data playback */
sleep(HZ*PCMBUF_TARGET_CHUNK/(NATIVE_FREQUENCY*4));
}
pcmbuf_add_chunk();
return true;
}
return false;
}
static bool prepare_insert(size_t length)
{
if (low_latency_mode)
@ -344,75 +405,6 @@ void pcmbuf_write_complete(int count)
}
}
/* This is really just part of pcmbuf_flush_fillpos, but is easier to keep
* in a separate function for the moment */
static inline void pcmbuf_add_chunk(void)
{
register size_t size = audiobuffer_fillpos;
/* Grab the next description to write, and change the write pointer */
register struct pcmbufdesc *pcmbuf_current = pcmbuf_write;
pcmbuf_write = pcmbuf_current->link;
/* Fill in the values in the new buffer chunk */
pcmbuf_current->addr = &audiobuffer[audiobuffer_pos];
pcmbuf_current->size = size;
pcmbuf_current->end_of_track = end_of_track;
pcmbuf_current->link = NULL;
end_of_track = false; /* This is single use only */
if (pcmbuf_read != NULL) {
if (pcmbuf_flush)
{
pcmbuf_write_end->link = pcmbuf_read->link;
pcmbuf_read->link = pcmbuf_current;
while (pcmbuf_write_end->link)
{
pcmbuf_write_end = pcmbuf_write_end->link;
pcmbuf_unplayed_bytes -= pcmbuf_write_end->size;
}
pcmbuf_flush = false;
}
/* If there is already a read buffer setup, add to it */
else
pcmbuf_read_end->link = pcmbuf_current;
} else {
/* Otherwise create the buffer */
pcmbuf_read = pcmbuf_current;
}
/* This is now the last buffer to read */
pcmbuf_read_end = pcmbuf_current;
/* Update bytes counters */
pcmbuf_unplayed_bytes += size;
audiobuffer_pos += size;
if (audiobuffer_pos >= pcmbuf_size)
audiobuffer_pos -= pcmbuf_size;
audiobuffer_fillpos = 0;
DISPLAY_DESC("add_chunk");
}
/**
* Commit samples waiting to the pcm buffer.
*/
static bool pcmbuf_flush_fillpos(void)
{
if (audiobuffer_fillpos) {
/* Never use the last buffer descriptor */
while (pcmbuf_write == pcmbuf_write_end) {
/* If this happens, something is being stupid */
if (!pcm_is_playing()) {
logf("pcmbuf_flush_fillpos error");
pcmbuf_play_start();
}
/* Let approximately one chunk of data playback */
sleep(HZ*PCMBUF_TARGET_CHUNK/(NATIVE_FREQUENCY*4));
}
pcmbuf_add_chunk();
return true;
}
return false;
}
/* Init */
@ -665,6 +657,14 @@ static void pcmbuf_finish_track_change(void)
/* Crossfade */
/* Clip sample to signed 16 bit range */
static inline int32_t clip_sample_16(int32_t sample)
{
if ((int16_t)sample != sample)
sample = 0x7fff ^ (sample >> 31);
return sample;
}
/**
* Low memory targets don't have crossfade, so don't compile crossfade
* specific code in order to save some memory. */

2
apps/pcmbuf.h
View file

@ -52,7 +52,7 @@ int pcmbuf_used_descs(void);
unsigned char *pcmbuf_get_meminfo(size_t *length);
#endif
/* misc */
/* Misc */
bool pcmbuf_is_lowdata(void);
void pcmbuf_set_low_latency(bool state);
unsigned long pcmbuf_get_latency(void);