Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/apps/pcmbuf.c
Miika Pekkarinen a85044bf9e New scheduler, with priorities for swcodec platforms. Frequent task 
switching should be more efficient and tasks are stored in linked
lists to eliminate unnecessary task switching to improve performance.
Audio should no longer skip on swcodec targets caused by too CPU
hungry UI thread or background threads.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10958 a1c6a512-1295-4272-9138-f99709370657
2006-09-16 16:18:11 +00:00

1024 lines
29 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Miika Pekkarinen
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdbool.h>
#include <stdio.h>
#include "config.h"
#include "debug.h"
#include "panic.h"
#include <kernel.h>
#include "pcmbuf.h"
#include "pcm_playback.h"
#include "logf.h"
#ifndef SIMULATOR
#include "cpu.h"
#endif
#include "system.h"
#include <string.h>
#include "buffer.h"
#include "settings.h"
#include "audio.h"
#include "dsp.h"
#include "thread.h"
/* Keep watermark high for iPods at least (2s) */
#define PCMBUF_WATERMARK (NATIVE_FREQUENCY * 8)
/* Structure we can use to queue pcm chunks in memory to be played
* by the driver code. */
struct pcmbufdesc
{
void *addr;
size_t size;
struct pcmbufdesc* link;
/* Call this when the buffer has been played */
void (*callback)(void);
};
/* Size of the PCM buffer. */
static size_t pcmbuf_size IDATA_ATTR = 0;
static char *audiobuffer IDATA_ATTR;
/* Current audio buffer write index. */
static size_t audiobuffer_pos IDATA_ATTR;
/* Amount audiobuffer_pos will be increased.*/
static size_t audiobuffer_fillpos IDATA_ATTR;
static char *fadebuf IDATA_ATTR;
static char *voicebuf IDATA_ATTR;
static void (*pcmbuf_event_handler)(void) IDATA_ATTR;
static void (*position_callback)(size_t size) IDATA_ATTR;
/* Crossfade related state */
static bool crossfade_enabled;
static bool crossfade_mixmode;
static bool crossfade_active IDATA_ATTR;
static bool crossfade_init IDATA_ATTR;
/* Track the current location for processing crossfade */
static struct pcmbufdesc *crossfade_chunk IDATA_ATTR;
static size_t crossfade_sample IDATA_ATTR;
/* Counters for fading in new data */
static size_t crossfade_fade_in_total IDATA_ATTR;
static size_t crossfade_fade_in_rem IDATA_ATTR;
static size_t pcmbuf_descsize;
static struct pcmbufdesc *pcmbuf_read IDATA_ATTR;
static struct pcmbufdesc *pcmbuf_read_end IDATA_ATTR;
static struct pcmbufdesc *pcmbuf_write IDATA_ATTR;
static struct pcmbufdesc *pcmbuf_write_end IDATA_ATTR;
static size_t last_chunksize IDATA_ATTR;
static size_t pcmbuf_unplayed_bytes IDATA_ATTR;
static size_t pcmbuf_watermark IDATA_ATTR;
static struct pcmbufdesc *pcmbuf_mix_chunk IDATA_ATTR;
static size_t pcmbuf_mix_sample IDATA_ATTR;
static bool low_latency_mode = false;
static bool pcmbuf_flush;
extern struct thread_entry *codec_thread_p;
/* Helpful macros for use in conditionals this assumes some of the above
* static variable names */
#define NEED_FLUSH(position) \
(audiobuffer_fillpos > PCMBUF_TARGET_CHUNK || position >= pcmbuf_size)
#define LOW_DATA(quarter_secs) \
(pcmbuf_unplayed_bytes < NATIVE_FREQUENCY * quarter_secs)
static bool prepare_insert(size_t length);
static void pcmbuf_under_watermark(void);
static bool pcmbuf_flush_fillpos(void);
#if defined(HAVE_ADJUSTABLE_CPU_FREQ) && !defined(SIMULATOR)
void pcmbuf_boost(bool state)
{
static bool boost_state = false;
#ifdef HAVE_PRIORITY_SCHEDULING
static bool priority_modified = false;
#endif
if (crossfade_init || crossfade_active)
return;
if (state != boost_state)
{
cpu_boost(state);
boost_state = state;
}
#ifdef HAVE_PRIORITY_SCHEDULING
if (state && LOW_DATA(2) && pcm_is_playing())
{
if (!priority_modified)
{
/* Buffer is critically low so override UI priority. */
priority_modified = true;
thread_set_priority(codec_thread_p, PRIORITY_REALTIME);
}
}
else if (priority_modified)
{
/* Set back the original priority. */
thread_set_priority(codec_thread_p, PRIORITY_PLAYBACK);
priority_modified = false;
}
#endif
}
#endif
#define CALL_IF_EXISTS(function, args...) if (function) function(args)
/* This function has 2 major logical parts (separated by brackets both for
* readability and variable scoping). The first part performs the
* operastions related to finishing off the last buffer we fed to the DMA.
* The second part performs the operations involved in sending a new buffer
* to the DMA. Finally the function checks the status of the buffer and
* boosts if necessary */
static void pcmbuf_callback(unsigned char** start, size_t* size) ICODE_ATTR;
static void pcmbuf_callback(unsigned char** start, size_t* size)
{
{
struct pcmbufdesc *pcmbuf_current = pcmbuf_read;
/* Take the finished buffer out of circulation */
pcmbuf_read = pcmbuf_current->link;
/* The buffer is finished, call the callback functions */
CALL_IF_EXISTS(position_callback, last_chunksize);
CALL_IF_EXISTS(pcmbuf_current->callback);
/* Put the finished buffer back into circulation */
pcmbuf_write_end->link = pcmbuf_current;
pcmbuf_write_end = pcmbuf_current;
/* If we've read over the mix chunk while it's still mixing there */
if (pcmbuf_current == pcmbuf_mix_chunk)
pcmbuf_mix_chunk = NULL;
/* If we've read over the crossfade chunk while it's still fading */
if (pcmbuf_current == crossfade_chunk)
crossfade_chunk = pcmbuf_read;
}
process_new_buffer:
{
/* Send the new buffer to the pcm */
struct pcmbufdesc *pcmbuf_new = pcmbuf_read;
size_t *realsize = size;
unsigned char** realstart = start;
if(pcmbuf_new)
{
size_t current_size = pcmbuf_new->size;
pcmbuf_unplayed_bytes -= current_size;
last_chunksize = current_size;
*realsize = current_size;
*realstart = pcmbuf_new->addr;
}
else
{
/* There may be more data waiting to flush, try to use it */
if (pcmbuf_flush_fillpos())
goto process_new_buffer;
/* No more buffers */
last_chunksize = 0;
*realsize = 0;
*realstart = NULL;
CALL_IF_EXISTS(pcmbuf_event_handler);
}
}
}
void pcmbuf_set_position_callback(void (*callback)(size_t size))
{
position_callback = callback;
}
static void pcmbuf_set_watermark_bytes(size_t numbytes)
{
pcmbuf_watermark = numbytes;
}
/* 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->callback = pcmbuf_event_handler;
pcmbuf_current->link = NULL;
/* This is single use only */
pcmbuf_event_handler = NULL;
if (pcmbuf_read) {
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;
}
static void pcmbuf_under_watermark(void)
{
/* Fill audio buffer by boosting cpu */
pcmbuf_boost(true);
/* Disable crossfade if < .5s of audio */
if (LOW_DATA(2))
{
crossfade_active = false;
}
}
void pcmbuf_set_event_handler(void (*event_handler)(void))
{
pcmbuf_event_handler = event_handler;
}
unsigned int pcmbuf_get_latency(void)
{
/* Be careful how this calculation is rearranted, it's easy to overflow */
size_t bytes = pcmbuf_unplayed_bytes + pcm_get_bytes_waiting();
return bytes / 4 / (NATIVE_FREQUENCY/1000);
}
void pcmbuf_set_low_latency(bool state)
{
low_latency_mode = state;
}
bool pcmbuf_is_lowdata(void)
{
if (!pcm_is_playing() || pcm_is_paused() ||
crossfade_init || crossfade_active)
return false;
/* 1 seconds of buffer is low data */
return LOW_DATA(4);
}
/* Amount of bytes left in the buffer. */
inline size_t pcmbuf_free(void)
{
if (pcmbuf_read)
{
size_t read = (size_t)pcmbuf_read->addr;
size_t write =
(size_t)&audiobuffer[audiobuffer_pos + audiobuffer_fillpos];
if (read < write)
read += pcmbuf_size;
return read - write;
}
return pcmbuf_size;
}
bool pcmbuf_crossfade_init(bool manual_skip)
{
/* Can't do two crossfades at once and, no fade if pcm is off now */
if (crossfade_init || crossfade_active || !pcm_is_playing())
{
pcmbuf_play_stop();
return false;
}
/* Not enough data, or crossfade disabled, flush the old data instead */
if (LOW_DATA(2) || !pcmbuf_is_crossfade_enabled() || low_latency_mode)
{
pcmbuf_boost(true);
pcmbuf_flush_fillpos();
pcmbuf_flush = true;
return false;
}
logf("pcmbuf_crossfade_init");
pcmbuf_boost(true);
/* Don't enable mix mode when skipping tracks manually. */
if (manual_skip)
crossfade_mixmode = false;
else
crossfade_mixmode = global_settings.crossfade_fade_out_mixmode;
crossfade_init = true;
return true;
}
void pcmbuf_play_stop(void)
{
/** Prevent a very tiny pop from happening by muting audio
* until dma has been initialized. */
pcm_mute(true);
pcm_play_stop();
pcm_mute(false);
pcmbuf_unplayed_bytes = 0;
pcmbuf_mix_chunk = NULL;
if (pcmbuf_read) {
pcmbuf_write_end->link = pcmbuf_read;
pcmbuf_write_end = pcmbuf_read_end;
pcmbuf_read = pcmbuf_read_end = NULL;
}
audiobuffer_pos = 0;
audiobuffer_fillpos = 0;
crossfade_init = false;
crossfade_active = false;
pcmbuf_flush = false;
pcmbuf_boost(false);
}
int pcmbuf_used_descs(void) {
struct pcmbufdesc *pcmbuf_temp = pcmbuf_read;
unsigned int i = 0;
while (pcmbuf_temp) {
pcmbuf_temp = pcmbuf_temp->link;
i++;
}
return i;
}
int pcmbuf_descs(void) {
return pcmbuf_size / PCMBUF_MINAVG_CHUNK;
}
size_t get_pcmbuf_descsize(void) {
return pcmbuf_descsize;
}
static void pcmbuf_init_pcmbuffers(void) {
struct pcmbufdesc *next = pcmbuf_write;
next++;
pcmbuf_write_end = pcmbuf_write;
while ((void *)next < (void *)audiobufend) {
pcmbuf_write_end->link=next;
pcmbuf_write_end=next;
next++;
}
}
/* Initialize the pcmbuffer the structure looks like this:
* ...CODECBUFFER|---------PCMBUF---------|GUARDBUF|DESCS| */
void pcmbuf_init(size_t bufsize)
{
pcmbuf_size = bufsize;
pcmbuf_descsize = pcmbuf_descs()*sizeof(struct pcmbufdesc);
audiobuffer = (char *)&audiobuf[(audiobufend - audiobuf) -
(pcmbuf_size + PCMBUF_MIX_CHUNK * 2 + pcmbuf_descsize)];
fadebuf = &audiobuffer[pcmbuf_size];
voicebuf = &fadebuf[PCMBUF_MIX_CHUNK];
pcmbuf_write = (struct pcmbufdesc *)(&voicebuf[PCMBUF_MIX_CHUNK]);
pcmbuf_init_pcmbuffers();
position_callback = NULL;
pcmbuf_event_handler = NULL;
pcmbuf_play_stop();
}
size_t pcmbuf_get_bufsize(void)
{
return pcmbuf_size;
}
void pcmbuf_pause(bool pause) {
if (pause)
pcm_mute(true);
pcm_play_pause(!pause);
if (!pause)
pcm_mute(false);
pcmbuf_boost(!pause && pcm_is_playing());
}
/* Force playback. */
void pcmbuf_play_start(void)
{
if (!pcm_is_playing() && pcmbuf_unplayed_bytes)
{
/** Prevent a very tiny pop from happening by muting audio
* until dma has been initialized. */
pcm_mute(true);
last_chunksize = pcmbuf_read->size;
pcmbuf_unplayed_bytes -= last_chunksize;
pcm_play_data(pcmbuf_callback,
(unsigned char *)pcmbuf_read->addr, last_chunksize);
/* Now unmute the audio. */
pcm_mute(false);
}
}
/**
* 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) {
logf("pcmbuf_flush_fillpos no descriptors");
/* Deboost to let the playback catchup */
pcmbuf_boost(false);
/* 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;
}
/**
* Completely process the crossfade fade out effect with current pcm buffer.
*/
static void crossfade_process_buffer(size_t fade_in_delay,
size_t fade_out_delay, size_t fade_out_rem)
{
if (!crossfade_mixmode)
{
/* Fade out the specified amount of the already processed audio */
size_t total_fade_out = fade_out_rem;
size_t fade_out_sample;
struct pcmbufdesc *fade_out_chunk = crossfade_chunk;
/* Find the right chunk to start fading out */
fade_out_delay += crossfade_sample * 2;
while (fade_out_delay >= fade_out_chunk->size)
{
fade_out_delay -= fade_out_chunk->size;
fade_out_chunk = fade_out_chunk->link;
}
/* The start sample within the chunk */
fade_out_sample = fade_out_delay / 2;
while (fade_out_rem > 0)
{
/* Each 1/10 second of audio will have the same fade applied */
size_t block_rem = MIN(NATIVE_FREQUENCY * 4 / 10, fade_out_rem);
int factor = (fade_out_rem << 8) / total_fade_out;
fade_out_rem -= block_rem;
/* Fade this block */
while (block_rem > 0)
{
/* Fade one sample */
short *buf = (short *)(fade_out_chunk->addr);
int sample = buf[fade_out_sample];
buf[fade_out_sample++] = (sample * factor) >> 8;
block_rem -= 2;
/* Move to the next chunk as needed */
if (fade_out_sample * 2 >= fade_out_chunk->size)
{
fade_out_chunk = fade_out_chunk->link;
fade_out_sample = 0;
}
}
}
}
/* Find the right chunk and sample to start fading in */
fade_in_delay += crossfade_sample * 2;
while (fade_in_delay >= crossfade_chunk->size)
{
fade_in_delay -= crossfade_chunk->size;
crossfade_chunk = crossfade_chunk->link;
}
crossfade_sample = fade_in_delay / 2;
logf("process done!");
}
/* Initializes crossfader, calculates all necessary parameters and
* performs fade-out with the pcm buffer. */
static void crossfade_start(void)
{
size_t crossfade_rem;
size_t crossfade_need;
size_t fade_out_rem;
size_t fade_out_delay;
size_t fade_in_delay;
crossfade_init = false;
/* Reject crossfade if less than .5s of data */
if (LOW_DATA(2)) {
logf("crossfade rejected");
pcmbuf_play_stop();
return ;
}
logf("crossfade_start");
pcmbuf_flush_fillpos();
crossfade_active = true;
/* Initialize the crossfade buffer size to all of the buffered data that
* has not yet been sent to the DMA */
crossfade_rem = pcmbuf_unplayed_bytes;
crossfade_chunk = pcmbuf_read->link;
crossfade_sample = 0;
/* Get fade out delay from settings. */
fade_out_delay =
NATIVE_FREQUENCY * global_settings.crossfade_fade_out_delay * 4;
/* Get fade out duration from settings. */
fade_out_rem =
NATIVE_FREQUENCY * global_settings.crossfade_fade_out_duration * 4;
crossfade_need = fade_out_delay + fade_out_rem;
/* We want only to modify the last part of the buffer. */
if (crossfade_rem > crossfade_need)
{
size_t crossfade_extra = crossfade_rem - crossfade_need;
while (crossfade_extra > crossfade_chunk->size)
{
crossfade_extra -= crossfade_chunk->size;
crossfade_chunk = crossfade_chunk->link;
}
crossfade_sample = crossfade_extra / 2;
}
/* Truncate fade out duration if necessary. */
else if (crossfade_rem < crossfade_need)
{
size_t crossfade_short = crossfade_need - crossfade_rem;
if (fade_out_rem >= crossfade_short)
fade_out_rem -= crossfade_short;
else
{
fade_out_delay -= crossfade_short - fade_out_rem;
fade_out_rem = 0;
}
}
/* Get also fade in duration and delays from settings. */
crossfade_fade_in_total =
NATIVE_FREQUENCY * global_settings.crossfade_fade_in_duration * 4;
crossfade_fade_in_rem = crossfade_fade_in_total;
fade_in_delay =
NATIVE_FREQUENCY * global_settings.crossfade_fade_in_delay * 4;
crossfade_process_buffer(fade_in_delay, fade_out_delay, fade_out_rem);
}
/* Returns the number of bytes _NOT_ mixed */
static size_t crossfade_fade_mix(int factor, const char *buf, size_t fade_rem)
{
const short *input_buf = (const short *)buf;
short *output_buf = (short *)(crossfade_chunk->addr);
short *chunk_end = (short *)((size_t)output_buf + crossfade_chunk->size);
output_buf = &output_buf[crossfade_sample];
while (fade_rem)
{
int sample = *input_buf++;
sample = ((sample * factor) >> 8) + *output_buf;
*output_buf++ = MIN(32767, MAX(-32768, sample));
fade_rem -= 2;
if (output_buf >= chunk_end)
{
crossfade_chunk = crossfade_chunk->link;
if (!crossfade_chunk)
return fade_rem;
output_buf = (short *)(crossfade_chunk->addr);
chunk_end = (short *)((size_t)output_buf + crossfade_chunk->size);
}
}
crossfade_sample = (size_t)(output_buf - (short *)(crossfade_chunk->addr));
return 0;
}
/* Returns the number of bytes _NOT_ mixed */
static size_t crossfade_mix(const char *buf, size_t length)
{
const short *input_buf = (const short *)buf;
short *output_buf = (short *)(crossfade_chunk->addr);
short *chunk_end = (short *)((size_t)output_buf + crossfade_chunk->size);
output_buf = &output_buf[crossfade_sample];
while (length)
{
int sample = *input_buf++ + *output_buf;
*output_buf++ = MIN(32767, MAX(-32768, sample));
length -= 2;
if (output_buf >= chunk_end)
{
crossfade_chunk = crossfade_chunk->link;
if (!crossfade_chunk)
return length;
output_buf = (short *)(crossfade_chunk->addr);
chunk_end = (short *)((size_t)output_buf + crossfade_chunk->size);
}
}
crossfade_sample = (size_t)(output_buf - (short *)(crossfade_chunk->addr));
return 0;
}
static void pcmbuf_flush_buffer(const char *buf, size_t length)
{
size_t copy_n;
while (length > 0) {
size_t audiobuffer_index = audiobuffer_pos + audiobuffer_fillpos;
if (NEED_FLUSH(audiobuffer_index))
{
pcmbuf_flush_fillpos();
audiobuffer_index = audiobuffer_pos + audiobuffer_fillpos;
}
copy_n = MIN(length, pcmbuf_size - audiobuffer_index);
memcpy(&audiobuffer[audiobuffer_index], buf, copy_n);
buf += copy_n;
audiobuffer_fillpos += copy_n;
length -= copy_n;
}
}
static void flush_crossfade(char *buf, size_t length)
{
if (length)
{
if (crossfade_fade_in_rem)
{
size_t samples;
short *input_buf;
/* Fade factor for this packet */
int factor =
((crossfade_fade_in_total - crossfade_fade_in_rem) << 8) /
crossfade_fade_in_total;
/* Bytes to fade */
size_t fade_rem = MIN(length, crossfade_fade_in_rem);
/* We _will_ fade this many bytes */
crossfade_fade_in_rem -= fade_rem;
if (crossfade_chunk)
{
/* Mix the data */
size_t fade_total = fade_rem;
fade_rem = crossfade_fade_mix(factor, buf, fade_rem);
length -= fade_total - fade_rem;
buf += fade_total - fade_rem;
if (!length)
return;
if (!fade_rem)
goto fade_done;
}
samples = fade_rem / 2;
input_buf = (short *)buf;
/* Fade remaining samples in place */
while (samples)
{
int sample = *input_buf;
*input_buf++ = (sample * factor) >> 8;
samples--;
}
}
fade_done:
if (crossfade_chunk)
{
/* Mix the data */
size_t mix_total = length;
length = crossfade_mix(buf, length);
buf += mix_total - length;
if (!length)
return;
}
/* Flush samples to the buffer */
while (!prepare_insert(length))
sleep(1);
pcmbuf_flush_buffer(buf, length);
}
}
static bool prepare_insert(size_t length)
{
if (low_latency_mode)
{
/* 1/4s latency. */
if (pcmbuf_unplayed_bytes > NATIVE_FREQUENCY * 4 / 4
&& pcm_is_playing())
return false;
}
/* Need to save PCMBUF_MIN_CHUNK to prevent wrapping overwriting */
if (pcmbuf_free() < length + PCMBUF_MIN_CHUNK)
{
pcmbuf_boost(false);
return false;
}
if (!pcm_is_playing())
{
pcmbuf_boost(true);
/* Pre-buffer 1s. */
#if MEM <= 1
if (!LOW_DATA(1))
#else
if (!LOW_DATA(4))
#endif
{
logf("pcm starting");
pcmbuf_play_start();
}
} else if (pcmbuf_unplayed_bytes <= pcmbuf_watermark)
pcmbuf_under_watermark();
return true;
}
void* pcmbuf_request_buffer(size_t length, size_t *realsize)
{
if (crossfade_init)
crossfade_start();
if (crossfade_active) {
*realsize = MIN(length, PCMBUF_MIX_CHUNK);
return fadebuf;
}
else
{
if(prepare_insert(length))
{
size_t audiobuffer_index = audiobuffer_pos + audiobuffer_fillpos;
*realsize = length;
if (pcmbuf_size - audiobuffer_index >= PCMBUF_MIN_CHUNK)
{
/* Usual case, there's space here */
return &audiobuffer[audiobuffer_index];
}
else
{
/* Flush and wrap the buffer */
pcmbuf_flush_fillpos();
audiobuffer_pos = 0;
return &audiobuffer[0];
}
}
else
{
*realsize = 0;
return NULL;
}
}
}
void* pcmbuf_request_voice_buffer(size_t length, size_t *realsize, bool mix)
{
if (mix)
{
if (pcmbuf_mix_chunk || pcmbuf_read->link)
{
*realsize = MIN(length, PCMBUF_MIX_CHUNK);
return voicebuf;
}
else
{
*realsize = 0;
return NULL;
}
}
else
return pcmbuf_request_buffer(length, realsize);
}
bool pcmbuf_is_crossfade_active(void)
{
return crossfade_active || crossfade_init;
}
void pcmbuf_write_complete(size_t length)
{
if (crossfade_active)
{
flush_crossfade(fadebuf, length);
if (!(crossfade_fade_in_rem || crossfade_chunk))
crossfade_active = false;
}
else
{
audiobuffer_fillpos += length;
if (NEED_FLUSH(audiobuffer_pos + audiobuffer_fillpos))
pcmbuf_flush_fillpos();
}
}
bool pcmbuf_insert_buffer(char *buf, size_t length)
{
if (crossfade_active)
{
flush_crossfade(buf, length);
if (!(crossfade_fade_in_rem || crossfade_chunk))
crossfade_active = false;
}
else
{
if (!prepare_insert(length))
return false;
pcmbuf_flush_buffer(buf, length);
}
return true;
}
/* Generates a constant square wave sound with a given frequency
in Hertz for a duration in milliseconds. */
void pcmbuf_beep(unsigned int frequency, size_t duration, int amplitude)
{
unsigned int count = 0, i = 0;
unsigned int interval = NATIVE_FREQUENCY / frequency;
long sample;
short *buf;
short *pcmbuf_end = (short *)fadebuf;
size_t samples = NATIVE_FREQUENCY / 1000 * duration;
if (pcm_is_playing())
{
if (pcmbuf_read->link)
{
/* Get the next chunk */
char *pcmbuf_mix_buf = pcmbuf_read->link->addr;
/* Give at least 1/8s clearance. */
buf = (short *)&pcmbuf_mix_buf[NATIVE_FREQUENCY * 4 / 8];
}
else
{
logf("No place to beep");
return;
}
while (i++ < samples)
{
sample = *buf;
*buf++ = MIN(MAX(sample + amplitude, -32768), 32767);
if (buf > pcmbuf_end)
buf = (short *)audiobuffer;
sample = *buf;
*buf++ = MIN(MAX(sample + amplitude, -32768), 32767);
/* Toggle square wav side */
if (++count >= interval)
{
count = 0;
amplitude = -amplitude;
}
if (buf > pcmbuf_end)
buf = (short *)audiobuffer;
}
}
else
{
buf = (short *)audiobuffer;
while (i++ < samples)
{
*buf++ = amplitude;
if (buf > pcmbuf_end)
buf = (short *)audiobuffer;
*buf++ = amplitude;
/* Toggle square wav side */
if (++count >= interval)
{
count = 0;
amplitude = -amplitude;
}
if (buf > pcmbuf_end)
buf = (short *)audiobuffer;
}
pcm_play_data(NULL, (unsigned char *)audiobuffer, samples * 4);
}
}
/* Returns pcm buffer usage in percents (0 to 100). */
int pcmbuf_usage(void)
{
return pcmbuf_unplayed_bytes * 100 / pcmbuf_size;
}
int pcmbuf_mix_free(void)
{
if (pcmbuf_mix_chunk)
{
size_t my_mix_end =
(size_t)&((short *)pcmbuf_mix_chunk->addr)[pcmbuf_mix_sample];
size_t my_write_pos = (size_t)&audiobuffer[audiobuffer_pos];
if (my_write_pos < my_mix_end)
my_write_pos += pcmbuf_size;
return (my_write_pos - my_mix_end) * 100 / pcmbuf_unplayed_bytes;
}
return 100;
}
void pcmbuf_mix_voice(size_t length)
{
short *ibuf = (short *)voicebuf;
short *obuf;
size_t chunk_samples;
if (!pcmbuf_mix_chunk && pcmbuf_read)
{
pcmbuf_mix_chunk = pcmbuf_read->link;
/* Start 1/8s into the next chunk */
pcmbuf_mix_sample = NATIVE_FREQUENCY * 4 / 16;
}
if (!pcmbuf_mix_chunk)
return;
obuf = (short *)pcmbuf_mix_chunk->addr;
chunk_samples = pcmbuf_mix_chunk->size / 2;
length /= 2;
while (length-- > 0) {
int sample = *ibuf++;
if (pcmbuf_mix_sample >= chunk_samples)
{
pcmbuf_mix_chunk = pcmbuf_mix_chunk->link;
if (!pcmbuf_mix_chunk)
return;
pcmbuf_mix_sample = 0;
obuf = pcmbuf_mix_chunk->addr;
chunk_samples = pcmbuf_mix_chunk->size / 2;
}
sample += obuf[pcmbuf_mix_sample] >> 2;
obuf[pcmbuf_mix_sample++] = MIN(MAX(sample, -32768), 32767);
}
}
void pcmbuf_crossfade_enable(bool on_off)
{
crossfade_enabled = on_off;
if (crossfade_enabled) {
/* If crossfading, try to keep the buffer full other than 1 second */
pcmbuf_set_watermark_bytes(pcmbuf_size - (NATIVE_FREQUENCY * 4 * 1));
} else {
/* Otherwise, just keep it above 2 second */
pcmbuf_set_watermark_bytes(PCMBUF_WATERMARK);
}
}
bool pcmbuf_is_crossfade_enabled(void)
{
if (global_settings.crossfade == CROSSFADE_ENABLE_SHUFFLE)
return global_settings.playlist_shuffle;
return crossfade_enabled;
}
Reference in a new issue View git blame Copy permalink