/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2005 by Linus Nielsen Feltzing * * 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 "system.h" #include "kernel.h" #include "logf.h" #include "audio.h" #include "sound.h" /** * APIs implemented in the target-specific portion: * Public - * pcm_init * pcm_get_bytes_waiting * pcm_calculate_peaks * Semi-private - * pcm_play_dma_start * pcm_play_dma_stop * pcm_play_pause_pause * pcm_play_pause_unpause */ /** These items may be implemented target specifically or need to be shared semi-privately **/ /* the registered callback function to ask for more mp3 data */ volatile pcm_more_callback_type pcm_callback_for_more = NULL; volatile bool pcm_playing = false; volatile bool pcm_paused = false; void pcm_play_dma_start(const void *addr, size_t size); void pcm_play_dma_stop(void); void pcm_play_pause_pause(void); void pcm_play_pause_unpause(void); /** Functions that require targeted implementation **/ #if defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) || (CONFIG_CPU == IMX31L) /* Implemented in target/... */ #else /* dummy functions for those not actually supporting all this yet */ void pcm_apply_settings(void) { } /** **/ void pcm_mute(bool mute) { #if defined(HAVE_WM8975) || defined(HAVE_WM8758) \ || defined(HAVE_WM8731) || defined(HAVE_WM8721) audiohw_mute(mute); #endif if (mute) sleep(HZ/16); } #endif /* defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) */ #if defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) || defined(CPU_PP) /* Implemented in target/... */ #else static int pcm_freq = HW_SAMPR_DEFAULT; /* 44.1 is default */ unsigned short* p IBSS_ATTR; size_t p_size IBSS_ATTR; void pcm_play_dma_start(const void *addr, size_t size) { p = (unsigned short*)addr; p_size = size; pcm_playing = true; } void pcm_play_dma_stop(void) { pcm_playing = false; if (!audio_status()) pcm_paused = false; } void pcm_play_pause_pause(void) { } void pcm_play_pause_unpause(void) { } void pcm_postinit(void) { audiohw_postinit(); } void pcm_set_frequency(unsigned int frequency) { (void)frequency; pcm_freq = HW_SAMPR_DEFAULT; } size_t pcm_get_bytes_waiting(void) { return p_size; } /* * This function goes directly into the DMA buffer to calculate the left and * right peak values. To avoid missing peaks it tries to look forward two full * peek periods (2/HZ sec, 100% overlap), although it's always possible that * the entire period will not be visible. To reduce CPU load it only looks at * every third sample, and this can be reduced even further if needed (even * every tenth sample would still be pretty accurate). */ /* Check for a peak every PEAK_STRIDE samples */ #define PEAK_STRIDE 3 /* Up to 1/50th of a second of audio for peak calculation */ /* This should use NATIVE_FREQUENCY, or eventually an adjustable freq. value */ #define PEAK_SAMPLES (44100/50) void pcm_calculate_peaks(int *left, int *right) { short *addr; short *end; { size_t samples = p_size / 4; addr = p; if (samples > PEAK_SAMPLES) samples = PEAK_SAMPLES - (PEAK_STRIDE - 1); else samples -= MIN(PEAK_STRIDE - 1, samples); end = &addr[samples * 2]; } if (left && right) { int left_peak = 0, right_peak = 0; while (addr < end) { int value; if ((value = addr [0]) > left_peak) left_peak = value; else if (-value > left_peak) left_peak = -value; if ((value = addr [PEAK_STRIDE | 1]) > right_peak) right_peak = value; else if (-value > right_peak) right_peak = -value; addr = &addr[PEAK_STRIDE * 2]; } *left = left_peak; *right = right_peak; } else if (left || right) { int peak_value = 0, value; if (right) addr += (PEAK_STRIDE | 1); while (addr < end) { if ((value = addr [0]) > peak_value) peak_value = value; else if (-value > peak_value) peak_value = -value; addr += PEAK_STRIDE * 2; } if (left) *left = peak_value; else *right = peak_value; } } #endif /* defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) || defined(CPU_PP) */ /**************************************************************************** * Functions that do not require targeted implementation but only a targeted * interface */ /* Common code to pcm_play_data and pcm_play_pause Returns true if DMA playback was started, else false. */ bool pcm_play_data_start(pcm_more_callback_type get_more, unsigned char *start, size_t size) { if (!(start && size)) { size = 0; if (get_more) get_more(&start, &size); } if (start && size) { pcm_play_dma_start(start, size); return true; } return false; } void pcm_play_data(pcm_more_callback_type get_more, unsigned char *start, size_t size) { pcm_callback_for_more = get_more; if (pcm_play_data_start(get_more, start, size) && pcm_paused) { pcm_paused = false; pcm_play_pause(false); } } void pcm_play_pause(bool play) { bool needs_change = pcm_paused == play; /* This needs to be done ahead of the rest to prevent infinite recursion from pcm_play_data */ pcm_paused = !play; if (pcm_playing && needs_change) { if (play) { if (pcm_get_bytes_waiting()) { logf("unpause"); pcm_play_pause_unpause(); } else { logf("unpause, no data waiting"); if (!pcm_play_data_start(pcm_callback_for_more, NULL, 0)) { pcm_play_dma_stop(); logf("unpause attempted, no data"); } } } else { logf("pause"); pcm_play_pause_pause(); } } /* pcm_playing && needs_change */ } void pcm_play_stop(void) { if (pcm_playing) pcm_play_dma_stop(); } bool pcm_is_playing(void) { return pcm_playing; } bool pcm_is_paused(void) { return pcm_paused; }