d37bf24d90
Replaces the NATIVE_FREQUENCY constant with a configurable frequency. The user may select 48000Hz if the hardware supports it. The default is still 44100Hz and the minimum is 44100Hz. The setting is located in the playback settings, under "Frequency". "Frequency" was duplicated in english.lang for now to avoid having to fix every .lang file for the moment and throwing everything out of sync because of the new play_frequency feature in features.txt. The next cleanup should combine it with the one included for recording and generalize the ID label. If the hardware doesn't support 48000Hz, no setting will be available. On particular hardware where very high rates are practical and desireable, the upper bound can be extended by patching. The PCM mixer can be configured to play at the full hardware frequency range. The DSP core can configure to the hardware minimum up to the maximum playback setting (some buffers must be reserved according to the maximum rate). If only 44100Hz is supported or possible on a given target for playback, using the DSP and mixer at other samperates is possible if the hardware offers them. Change-Id: I6023cf0c0baa8bc6292b6919b4dd3618a6a25622 Reviewed-on: http://gerrit.rockbox.org/479 Reviewed-by: Michael Sevakis <jethead71@rockbox.org> Tested-by: Michael Sevakis <jethead71@rockbox.org>
136 lines
4.4 KiB
C
136 lines
4.4 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) 2011 by Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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#ifndef PCM_MIXER_H
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#define PCM_MIXER_H
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#include <sys/types.h>
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/** Simple config **/
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/* Length of PCM frames (always) */
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#if CONFIG_CPU == PP5002
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/* There's far less time to do mixing because HW FIFOs are short */
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#define MIX_FRAME_SAMPLES 64
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#elif (CONFIG_PLATFORM & PLATFORM_MAEMO5)
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/* Maemo 5 needs 2048 samples for decent performance.
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Otherwise the locking overhead inside gstreamer costs too much */
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#define MIX_FRAME_SAMPLES 2048
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/* Assume HW DMA engine is available or sufficient latency exists in the
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PCM pathway */
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#else
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#define MIX_FRAME_SAMPLES 256
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#endif
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#if defined(CPU_COLDFIRE) || defined(CPU_PP)
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/* For Coldfire, it's just faster
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For PortalPlayer, this also avoids more expensive cache coherency */
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#define DOWNMIX_BUF_IBSS IBSS_ATTR
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#else
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/* Otherwise can't DMA from IRAM, IRAM is pointless or worse */
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#define DOWNMIX_BUF_IBSS
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#endif
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#if defined(CPU_COLDFIRE) || defined(CPU_PP)
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#define MIXER_CALLBACK_ICODE ICODE_ATTR
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#else
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#define MIXER_CALLBACK_ICODE
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#endif
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/** Definitions **/
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/* Channels are preassigned for simplicity */
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enum pcm_mixer_channel
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{
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PCM_MIXER_CHAN_PLAYBACK = 0,
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PCM_MIXER_CHAN_VOICE,
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#ifndef HAVE_HARDWARE_BEEP
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PCM_MIXER_CHAN_BEEP,
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#endif
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/* Add new channel indexes above this line */
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PCM_MIXER_NUM_CHANNELS,
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};
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/* Channel playback states */
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enum channel_status
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{
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CHANNEL_STOPPED = 0,
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CHANNEL_PLAYING,
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CHANNEL_PAUSED,
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};
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#define MIX_AMP_UNITY 0x00010000
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#define MIX_AMP_MUTE 0x00000000
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/** Public interfaces **/
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/* Start playback on a channel */
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void mixer_channel_play_data(enum pcm_mixer_channel channel,
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pcm_play_callback_type get_more,
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const void *start, size_t size);
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/* Pause or resume a channel (when started) */
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void mixer_channel_play_pause(enum pcm_mixer_channel channel, bool play);
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/* Stop playback on a channel */
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void mixer_channel_stop(enum pcm_mixer_channel channel);
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/* Set channel's amplitude factor */
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void mixer_channel_set_amplitude(enum pcm_mixer_channel channel,
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unsigned int amplitude);
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/* Return channel's playback status */
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enum channel_status mixer_channel_status(enum pcm_mixer_channel channel);
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/* Returns amount data remaining in channel before next callback */
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size_t mixer_channel_get_bytes_waiting(enum pcm_mixer_channel channel);
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/* Return pointer to channel's playing audio data and the size remaining */
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const void * mixer_channel_get_buffer(enum pcm_mixer_channel channel,
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int *count);
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/* Calculate peak values for channel */
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void mixer_channel_calculate_peaks(enum pcm_mixer_channel channel,
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struct pcm_peaks *peaks);
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/* Adjust channel pointer by a given offset to support movable buffers */
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void mixer_adjust_channel_address(enum pcm_mixer_channel channel,
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off_t offset);
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/* Set a hook that is called upon getting a new source buffer for a channel
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NOTE: Called for each buffer, not each mixer chunk */
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typedef void (*chan_buffer_hook_fn_type)(const void *start, size_t size);
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void mixer_channel_set_buffer_hook(enum pcm_mixer_channel channel,
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chan_buffer_hook_fn_type fn);
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/* Stop ALL channels and PCM and reset state */
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void mixer_reset(void);
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/* Set output samplerate */
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void mixer_set_frequency(unsigned int samplerate);
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/* Get output samplerate */
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unsigned int mixer_get_frequency(void);
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#endif /* PCM_MIXER_H */
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