a56b65342f
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14919 a1c6a512-1295-4272-9138-f99709370657
283 lines
7.1 KiB
C
283 lines
7.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "kernel.h"
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#include "logf.h"
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#include "audio.h"
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#include "sound.h"
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/**
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* APIs implemented in the target-specific portion:
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* Public -
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* pcm_init
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* pcm_get_bytes_waiting
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* pcm_calculate_peaks
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* Semi-private -
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* pcm_play_dma_start
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* pcm_play_dma_stop
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* pcm_play_pause_pause
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* pcm_play_pause_unpause
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*/
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/** These items may be implemented target specifically or need to
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be shared semi-privately **/
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/* the registered callback function to ask for more mp3 data */
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volatile pcm_more_callback_type pcm_callback_for_more = NULL;
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volatile bool pcm_playing = false;
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volatile bool pcm_paused = false;
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void pcm_play_dma_start(const void *addr, size_t size);
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void pcm_play_dma_stop(void);
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void pcm_play_pause_pause(void);
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void pcm_play_pause_unpause(void);
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/** Functions that require targeted implementation **/
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#if defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) || (CONFIG_CPU == IMX31L) \
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|| (CONFIG_CPU == DM320)
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/* Implemented in target/... */
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#else
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/* dummy functions for those not actually supporting all this yet */
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void pcm_apply_settings(void)
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{
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}
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/** **/
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void pcm_mute(bool mute)
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{
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#if defined(HAVE_WM8975) || defined(HAVE_WM8758) \
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|| defined(HAVE_WM8731) || defined(HAVE_WM8721)
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audiohw_mute(mute);
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#endif
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if (mute)
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sleep(HZ/16);
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}
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#endif /* defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) */
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#if defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) || defined(CPU_PP) \
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|| (CONFIG_CPU == IMX31L) || (CONFIG_CPU == DM320)
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/* Implemented in target/... */
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#else
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static int pcm_freq = HW_SAMPR_DEFAULT; /* 44.1 is default */
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unsigned short* p IBSS_ATTR;
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size_t p_size IBSS_ATTR;
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void pcm_play_dma_start(const void *addr, size_t size)
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{
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p = (unsigned short*)addr;
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p_size = size;
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pcm_playing = true;
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}
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void pcm_play_dma_stop(void)
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{
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pcm_playing = false;
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if (!audio_status())
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pcm_paused = false;
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}
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void pcm_play_pause_pause(void)
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{
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}
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void pcm_play_pause_unpause(void)
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{
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}
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void pcm_postinit(void)
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{
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audiohw_postinit();
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}
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void pcm_set_frequency(unsigned int frequency)
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{
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(void)frequency;
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pcm_freq = HW_SAMPR_DEFAULT;
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}
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size_t pcm_get_bytes_waiting(void)
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{
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return p_size;
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}
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/*
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* This function goes directly into the DMA buffer to calculate the left and
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* right peak values. To avoid missing peaks it tries to look forward two full
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* peek periods (2/HZ sec, 100% overlap), although it's always possible that
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* the entire period will not be visible. To reduce CPU load it only looks at
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* every third sample, and this can be reduced even further if needed (even
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* every tenth sample would still be pretty accurate).
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*/
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/* Check for a peak every PEAK_STRIDE samples */
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#define PEAK_STRIDE 3
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/* Up to 1/50th of a second of audio for peak calculation */
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/* This should use NATIVE_FREQUENCY, or eventually an adjustable freq. value */
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#define PEAK_SAMPLES (44100/50)
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void pcm_calculate_peaks(int *left, int *right)
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{
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short *addr;
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short *end;
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{
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size_t samples = p_size / 4;
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addr = p;
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if (samples > PEAK_SAMPLES)
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samples = PEAK_SAMPLES - (PEAK_STRIDE - 1);
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else
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samples -= MIN(PEAK_STRIDE - 1, samples);
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end = &addr[samples * 2];
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}
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if (left && right) {
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int left_peak = 0, right_peak = 0;
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while (addr < end) {
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int value;
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if ((value = addr [0]) > left_peak)
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left_peak = value;
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else if (-value > left_peak)
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left_peak = -value;
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if ((value = addr [PEAK_STRIDE | 1]) > right_peak)
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right_peak = value;
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else if (-value > right_peak)
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right_peak = -value;
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addr = &addr[PEAK_STRIDE * 2];
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}
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*left = left_peak;
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*right = right_peak;
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}
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else if (left || right) {
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int peak_value = 0, value;
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if (right)
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addr += (PEAK_STRIDE | 1);
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while (addr < end) {
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if ((value = addr [0]) > peak_value)
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peak_value = value;
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else if (-value > peak_value)
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peak_value = -value;
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addr += PEAK_STRIDE * 2;
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}
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if (left)
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*left = peak_value;
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else
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*right = peak_value;
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}
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}
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#endif /* defined(CPU_COLDFIRE) || (CONFIG_CPU == S3C2440) || defined(CPU_PP) */
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/****************************************************************************
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* Functions that do not require targeted implementation but only a targeted
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* interface
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*/
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/* Common code to pcm_play_data and pcm_play_pause
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Returns true if DMA playback was started, else false. */
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bool pcm_play_data_start(pcm_more_callback_type get_more,
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unsigned char *start, size_t size)
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{
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if (!(start && size))
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{
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size = 0;
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if (get_more)
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get_more(&start, &size);
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}
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if (start && size)
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{
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pcm_play_dma_start(start, size);
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return true;
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}
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return false;
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}
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void pcm_play_data(pcm_more_callback_type get_more,
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unsigned char *start, size_t size)
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{
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pcm_callback_for_more = get_more;
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if (pcm_play_data_start(get_more, start, size) && pcm_paused)
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{
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pcm_paused = false;
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pcm_play_pause(false);
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}
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}
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void pcm_play_pause(bool play)
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{
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bool needs_change = pcm_paused == play;
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/* This needs to be done ahead of the rest to prevent infinite
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recursion from pcm_play_data */
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pcm_paused = !play;
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if (pcm_playing && needs_change)
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{
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if (play)
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{
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if (pcm_get_bytes_waiting())
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{
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logf("unpause");
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pcm_play_pause_unpause();
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}
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else
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{
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logf("unpause, no data waiting");
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if (!pcm_play_data_start(pcm_callback_for_more, NULL, 0))
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{
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pcm_play_dma_stop();
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logf("unpause attempted, no data");
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}
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}
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}
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else
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{
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logf("pause");
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pcm_play_pause_pause();
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}
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} /* pcm_playing && needs_change */
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}
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void pcm_play_stop(void)
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{
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if (pcm_playing)
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pcm_play_dma_stop();
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}
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bool pcm_is_playing(void)
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{
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return pcm_playing;
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}
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bool pcm_is_paused(void)
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{
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return pcm_paused;
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}
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