/*************************************************************************** * __________ __ ___. * 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 #include #include "config.h" #include "debug.h" #include "panic.h" #include #include "pcmbuf.h" #include "pcm.h" #include "logf.h" #ifndef SIMULATOR #include "cpu.h" #endif #include "system.h" #include #include "buffer.h" #include "settings.h" #include "audio.h" #include "voice_thread.h" #include "dsp.h" #include "thread.h" /* Define PCMBUF_MUTING if the codec requires muting to prevent pops */ #if !defined(HAVE_UDA1380) && !defined(HAVE_TLV320) && !defined(HAVE_AS3514) #define PCMBUF_MUTING #endif /* 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; } /* Keep watermark high for iPods at least (2s) */ #define PCMBUF_WATERMARK (NATIVE_FREQUENCY * 4 * 2) /* 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); }; #define PCMBUF_DESCS(bufsize) \ ((bufsize) / PCMBUF_MINAVG_CHUNK) #define PCMBUF_DESCS_SIZE(bufsize) \ (PCMBUF_DESCS(bufsize)*sizeof(struct pcmbufdesc)) /* Size of the PCM buffer. */ static size_t pcmbuf_size IDATA_ATTR = 0; static char *pcmbuf_bufend IDATA_ATTR; 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_enabled_pending; 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 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; #ifdef HAVE_PRIORITY_SCHEDULING static int codec_thread_priority = PRIORITY_PLAYBACK; #endif 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); #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; } { /* 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 { /* 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(void) { pcmbuf_watermark = (crossfade_enabled && pcmbuf_size) ? /* If crossfading, try to keep the buffer full other than 1 second */ (pcmbuf_size - (NATIVE_FREQUENCY * 4 * 1)) : /* Otherwise, just keep it above 2 second */ PCMBUF_WATERMARK; } /* 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 != 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; } #ifdef HAVE_PRIORITY_SCHEDULING static void boost_codec_thread(bool boost) { /* Keep voice and codec threads at the same priority or else voice * will starve if the codec thread's priority is boosted. */ if (boost) { int priority = (PRIORITY_PLAYBACK - PRIORITY_PLAYBACK_MAX)*pcmbuf_unplayed_bytes / (2*NATIVE_FREQUENCY) + PRIORITY_PLAYBACK_MAX; if (priority != codec_thread_priority) { codec_thread_priority = priority; thread_set_priority(codec_thread_p, priority); voice_thread_set_priority(priority); } } else if (codec_thread_priority != PRIORITY_PLAYBACK) { thread_set_priority(codec_thread_p, PRIORITY_PLAYBACK); voice_thread_set_priority(PRIORITY_PLAYBACK); codec_thread_priority = PRIORITY_PLAYBACK; } } #endif /* HAVE_PRIORITY_SCHEDULING */ static void pcmbuf_under_watermark(void) { /* Only codec thread initiates boost - voice boosts the cpu when playing a clip */ #ifndef SIMULATOR if (thread_get_current() == codec_thread_p) #endif /* SIMULATOR */ { #ifdef HAVE_PRIORITY_SCHEDULING /* If buffer is critically low, override UI priority, else set back to the original priority. */ boost_codec_thread(LOW_DATA(2) && pcm_is_playing()); #endif /* Fill audio buffer by boosting cpu */ trigger_cpu_boost(); } /* 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 rearranged, 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 != NULL) { void *read = pcmbuf_read->addr; void *write = &audiobuffer[audiobuffer_pos + audiobuffer_fillpos]; if (read < write) return (size_t)(read - write) + pcmbuf_size; else return (size_t) (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; } trigger_cpu_boost(); /* Not enough data, or crossfade disabled, flush the old data instead */ if (LOW_DATA(2) || !pcmbuf_is_crossfade_enabled() || low_latency_mode) { pcmbuf_flush_fillpos(); pcmbuf_flush = true; return false; } /* 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) { pcm_play_stop(); 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; #ifdef HAVE_PRIORITY_SCHEDULING /* Can unboost the codec thread here no matter who's calling */ boost_codec_thread(false); #endif } 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_DESCS(pcmbuf_size); } static void pcmbuf_init_pcmbuffers(void) { struct pcmbufdesc *next = pcmbuf_write; next++; pcmbuf_write_end = pcmbuf_write; while ((void *)next < (void *)pcmbuf_bufend) { pcmbuf_write_end->link=next; pcmbuf_write_end=next; next++; } } static size_t pcmbuf_get_next_required_pcmbuf_size(void) { #if MEM > 1 size_t seconds = 1; if (crossfade_enabled_pending) seconds += global_settings.crossfade_fade_out_delay + global_settings.crossfade_fade_out_duration; /* Buffer has to be at least 2s long. */ seconds += 2; logf("pcmbuf len: %ld", seconds); return seconds * (NATIVE_FREQUENCY*4); #else return NATIVE_FREQUENCY*2; #endif } static char *pcmbuf_calc_audiobuffer_ptr(size_t bufsize) { return pcmbuf_bufend - (bufsize + PCMBUF_MIX_CHUNK * 2 + PCMBUF_DESCS_SIZE(bufsize)); } bool pcmbuf_is_same_size(void) { if (audiobuffer == NULL) return true; /* Not set up yet even once so always */ size_t bufsize = pcmbuf_get_next_required_pcmbuf_size(); return pcmbuf_calc_audiobuffer_ptr(bufsize) == audiobuffer; } /* Initialize the pcmbuffer the structure looks like this: * ...|---------PCMBUF---------|FADEBUF|VOICEBUF|DESCS|... */ size_t pcmbuf_init(unsigned char *bufend) { pcmbuf_bufend = bufend; pcmbuf_size = pcmbuf_get_next_required_pcmbuf_size(); audiobuffer = pcmbuf_calc_audiobuffer_ptr(pcmbuf_size); 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_crossfade_enable_finished(); pcmbuf_play_stop(); return pcmbuf_bufend - audiobuffer; } size_t pcmbuf_get_bufsize(void) { return pcmbuf_size; } #ifdef ROCKBOX_HAS_LOGF unsigned char * pcmbuf_get_meminfo(size_t *length) { *length = pcmbuf_bufend - audiobuffer; return audiobuffer; } #endif void pcmbuf_pause(bool pause) { #ifdef PCMBUF_MUTING if (pause) pcm_mute(true); #endif if (pcm_is_playing()) pcm_play_pause(!pause); else if (!pause) pcmbuf_play_start(); #ifdef PCMBUF_MUTING if (!pause) pcm_mute(false); #endif trigger_cpu_boost(); } /* Force playback. */ void pcmbuf_play_start(void) { if (!pcm_is_playing() && pcmbuf_unplayed_bytes && pcmbuf_read != NULL) { last_chunksize = pcmbuf_read->size; pcmbuf_unplayed_bytes -= last_chunksize; pcm_play_data(pcmbuf_callback, (unsigned char *)pcmbuf_read->addr, last_chunksize); } } /** * 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; } /** * 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 != 0 && 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_out_chunk != NULL) { /* Fade one sample */ int16_t *buf = (int16_t *)fade_out_chunk->addr; int32_t 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 != 0 && 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 int16_t *input_buf = (const int16_t *)buf; int16_t *output_buf = (int16_t *)(crossfade_chunk->addr); int16_t *chunk_end = SKIPBYTES(output_buf, crossfade_chunk->size); output_buf = &output_buf[crossfade_sample]; int32_t sample; while (fade_rem) { /* fade left and right channel at once to keep buffer alignment */ sample = *input_buf++; sample = ((sample * factor) >> 8) + *output_buf; *output_buf++ = clip_sample_16(sample); sample = *input_buf++; sample = ((sample * factor) >> 8) + *output_buf; *output_buf++ = clip_sample_16(sample); fade_rem -= 4; /* 2 samples, each 16 bit -> 4 bytes */ if (output_buf >= chunk_end) { crossfade_chunk = crossfade_chunk->link; if (!crossfade_chunk) return fade_rem; output_buf = (int16_t *)crossfade_chunk->addr; chunk_end = SKIPBYTES(output_buf, crossfade_chunk->size); } } crossfade_sample = output_buf - (int16_t *)crossfade_chunk->addr; return 0; } /* Returns the number of bytes _NOT_ mixed */ static size_t crossfade_mix(const char *buf, size_t length) { const int16_t *input_buf = (const int16_t *)buf; int16_t *output_buf = (int16_t *)crossfade_chunk->addr; int16_t *chunk_end = SKIPBYTES(output_buf, crossfade_chunk->size); output_buf = &output_buf[crossfade_sample]; int32_t sample; while (length) { /* fade left and right channel at once to keep buffer alignment */ sample = *input_buf++ + *output_buf; *output_buf++ = clip_sample_16(sample); sample = *input_buf++ + *output_buf; *output_buf++ = clip_sample_16(sample); length -= 4; /* 2 samples, each 16 bit -> 4 bytes */ if (output_buf >= chunk_end) { crossfade_chunk = crossfade_chunk->link; if (!crossfade_chunk) return length; output_buf = (int16_t *)crossfade_chunk->addr; chunk_end = SKIPBYTES(output_buf, crossfade_chunk->size); } } crossfade_sample = output_buf - (int16_t *)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; int16_t *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 = (int16_t *)buf; /* Fade remaining samples in place */ while (samples) { int32_t 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 / 2 && pcm_is_playing()) return false; } /* Need to save PCMBUF_MIN_CHUNK to prevent wrapping overwriting */ if (pcmbuf_free() < length + PCMBUF_MIN_CHUNK) return false; if (!pcm_is_playing()) { trigger_cpu_boost(); /* Pre-buffer 1s. */ #if MEM <= 1 if (!LOW_DATA(1)) #else if (!LOW_DATA(4)) #endif { logf("pcm starting"); if (!(audio_status() & AUDIO_STATUS_PAUSE)) pcmbuf_play_start(); } } else if (pcmbuf_unplayed_bytes <= pcmbuf_watermark) pcmbuf_under_watermark(); return true; } void* pcmbuf_request_buffer(int *count) { if (crossfade_init) crossfade_start(); if (crossfade_active) { *count = MIN(*count, PCMBUF_MIX_CHUNK/4); return fadebuf; } else { if(prepare_insert(*count << 2)) { size_t audiobuffer_index = audiobuffer_pos + audiobuffer_fillpos; 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 { return NULL; } } } void * pcmbuf_request_voice_buffer(int *count) { /* A get-it-to-work-for-now hack (audio status could change by completion) */ if (audio_status() & AUDIO_STATUS_PLAY) { if (pcmbuf_read == NULL) { return NULL; } else if (pcmbuf_usage() >= 10 && pcmbuf_mix_free() >= 30 && (pcmbuf_mix_chunk || pcmbuf_read->link)) { *count = MIN(*count, PCMBUF_MIX_CHUNK/4); return voicebuf; } else { return NULL; } } else { return pcmbuf_request_buffer(count); } } bool pcmbuf_is_crossfade_active(void) { return crossfade_active || crossfade_init; } void pcmbuf_write_complete(int count) { size_t length = (size_t)(unsigned int)count << 2; 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(); } } #if 0 bool pcmbuf_insert_buffer(char *buf, int count) { size_t length = (size_t)(unsigned int)count << 2; 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; } #endif /* 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; unsigned int i; unsigned int interval = NATIVE_FREQUENCY / frequency; unsigned int samples = NATIVE_FREQUENCY / 1000 * duration; int32_t sample; int16_t *bufstart; int16_t *bufptr; int16_t *pcmbuf_end = (int16_t *)fadebuf; bool mix = pcmbuf_read != NULL && pcmbuf_read->link != NULL; /* Find the insertion point and set bufstart to the start of it */ if (mix) { /* Get the next chunk */ char *pcmbuf_mix_buf = pcmbuf_read->link->addr; /* Give 1/8s clearance. */ bufstart = (int16_t *)&pcmbuf_mix_buf[NATIVE_FREQUENCY * 4 / 8]; } else { /* Use audiobuffer */ bufstart = (int16_t *)audiobuffer; } /* Mix square wave into buffer */ bufptr = bufstart; for (i = 0; i < samples; ++i) { sample = mix ? *bufptr : 0; *bufptr++ = clip_sample_16(sample + amplitude); if (bufptr > pcmbuf_end) bufptr = (int16_t *)audiobuffer; sample = mix ? *bufptr : 0; *bufptr++ = clip_sample_16(sample + amplitude); if (bufptr > pcmbuf_end) bufptr = (int16_t *)audiobuffer; /* Toggle square wave edge */ if (++count >= interval) { count = 0; amplitude = -amplitude; } } /* Kick off playback if required */ if (!pcm_is_playing()) { pcm_play_data(NULL, (unsigned char *)bufstart, 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)&((int16_t *)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_write_voice_complete(int count) { /* A get-it-to-work-for-now hack (audio status could have changed) */ if (!(audio_status() & AUDIO_STATUS_PLAY)) { pcmbuf_write_complete(count); return; } int16_t *ibuf = (int16_t *)voicebuf; int16_t *obuf; size_t chunk_samples; if (pcmbuf_mix_chunk == NULL && pcmbuf_read != NULL) { 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 = (int16_t *)pcmbuf_mix_chunk->addr; chunk_samples = pcmbuf_mix_chunk->size / sizeof (int16_t); count <<= 1; while (count-- > 0) { int32_t 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++] = clip_sample_16(sample); } } void pcmbuf_crossfade_enable(bool on_off) { #if MEM > 1 /* Next setting to be used, not applied now */ crossfade_enabled_pending = on_off; #endif (void)on_off; } void pcmbuf_crossfade_enable_finished(void) { /* Copy the pending setting over now */ crossfade_enabled = crossfade_enabled_pending; pcmbuf_set_watermark_bytes(); } bool pcmbuf_is_crossfade_enabled(void) { if (global_settings.crossfade == CROSSFADE_ENABLE_SHUFFLE) return global_settings.playlist_shuffle; return crossfade_enabled; }