61d0583384
Uses a cosine factor to smoothly shift the PCM level from the old level to the new one over the length of a frame. Implements indirect calls to PCM scaling function instead of testing conditions on every callback, cleanly assigning a different call to do the volume transition. The volume change call then assigns the final scaling function. Change-Id: If1004b92a91c5ca766dd0e4014ec274636e8ed26 Reviewed-on: http://gerrit.rockbox.org/763 Reviewed-by: Michael Sevakis <jethead71@rockbox.org> Tested: Michael Sevakis <jethead71@rockbox.org>
189 lines
6.2 KiB
C
189 lines
6.2 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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* 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_INTERNAL_H
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#define PCM_INTERNAL_H
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#include "config.h"
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#ifdef HAVE_SW_VOLUME_CONTROL
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/* Default settings - architecture may have other optimal values */
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#ifndef PCM_SW_VOLUME_FRACBITS
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/* Allows -73 to +6dB gain, sans large integer math */
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#define PCM_SW_VOLUME_FRACBITS (15)
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#endif
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/* Constants selected based on integer math overflow avoidance */
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#if PCM_SW_VOLUME_FRACBITS <= 16
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#define PCM_FACTOR_MAX 0x00010000u
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#define PCM_FACTOR_UNITY (1u << PCM_SW_VOLUME_FRACBITS)
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#elif PCM_SW_VOLUME_FRACBITS <= 31
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#define PCM_FACTOR_MAX 0x80000000u
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#define PCM_FACTOR_UNITY (1u << PCM_SW_VOLUME_FRACBITS)
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#endif /* PCM_SW_VOLUME_FRACBITS */
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#ifdef PCM_SW_VOLUME_UNBUFFERED
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/* Copies buffer with volume scaling applied */
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void pcm_sw_volume_copy_buffer(void *dst, const void *src, size_t size);
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#define pcm_copy_buffer pcm_sw_volume_copy_buffer
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#else /* !PCM_SW_VOLUME_UNBUFFERED */
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#ifdef HAVE_SDL_AUDIO
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#define pcm_copy_buffer memcpy
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#endif
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#ifndef PCM_PLAY_DBL_BUF_SAMPLES
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#define PCM_PLAY_DBL_BUF_SAMPLES 1024 /* Max 4KByte chunks */
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#endif
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#ifndef PCM_DBL_BUF_BSS
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#define PCM_DBL_BUF_BSS /* In DRAM, uncached may be better */
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#endif
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#endif /* PCM_SW_VOLUME_UNBUFFERED */
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void pcm_sync_pcm_factors(void);
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#endif /* HAVE_SW_VOLUME_CONTROL */
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#define PCM_SAMPLE_SIZE (2 * sizeof (int16_t))
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/* Cheapo buffer align macro to align to the 16-16 PCM size */
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#define ALIGN_AUDIOBUF(start, size) \
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({ (start) = (void *)(((uintptr_t)(start) + 3) & ~3); \
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(size) &= ~3; })
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void pcm_do_peak_calculation(struct pcm_peaks *peaks, bool active,
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const void *addr, int count);
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/** The following are for internal use between pcm.c and target-
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specific portion **/
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/* Call registered callback to obtain next buffer */
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static inline bool pcm_get_more_int(const void **addr, size_t *size)
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{
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extern volatile pcm_play_callback_type pcm_callback_for_more;
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pcm_play_callback_type get_more = pcm_callback_for_more;
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if (UNLIKELY(!get_more))
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return false;
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*addr = NULL;
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*size = 0;
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get_more(addr, size);
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ALIGN_AUDIOBUF(*addr, *size);
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return *addr && *size;
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}
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static FORCE_INLINE enum pcm_dma_status pcm_call_status_cb(
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pcm_status_callback_type callback, enum pcm_dma_status status)
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{
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if (!callback)
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return status;
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return callback(status);
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}
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static FORCE_INLINE enum pcm_dma_status pcm_play_call_status_cb(
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enum pcm_dma_status status)
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{
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extern enum pcm_dma_status
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(* volatile pcm_play_status_callback)(enum pcm_dma_status);
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return pcm_call_status_cb(pcm_play_status_callback, status);
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}
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static FORCE_INLINE enum pcm_dma_status
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pcm_play_dma_status_callback(enum pcm_dma_status status)
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{
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#if defined(HAVE_SW_VOLUME_CONTROL) && !defined(PCM_SW_VOLUME_UNBUFFERED)
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extern enum pcm_dma_status
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pcm_play_dma_status_callback_int(enum pcm_dma_status status);
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return pcm_play_dma_status_callback_int(status);
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#else
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return pcm_play_call_status_cb(status);
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#endif /* HAVE_SW_VOLUME_CONTROL && !PCM_SW_VOLUME_UNBUFFERED */
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}
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#if defined(HAVE_SW_VOLUME_CONTROL) && !defined(PCM_SW_VOLUME_UNBUFFERED)
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void pcm_play_dma_start_int(const void *addr, size_t size);
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void pcm_play_dma_pause_int(bool pause);
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void pcm_play_dma_stop_int(void);
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void pcm_play_stop_int(void);
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const void *pcm_play_dma_get_peak_buffer_int(int *count);
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#endif /* HAVE_SW_VOLUME_CONTROL && !PCM_SW_VOLUME_UNBUFFERED */
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/* Called by the bottom layer ISR when more data is needed. Returns true
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* if a new buffer is available, false otherwise. */
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bool pcm_play_dma_complete_callback(enum pcm_dma_status status,
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const void **addr, size_t *size);
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extern unsigned long pcm_curr_sampr;
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extern unsigned long pcm_sampr;
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extern int pcm_fsel;
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#ifdef HAVE_PCM_DMA_ADDRESS
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void * pcm_dma_addr(void *addr);
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#endif
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extern volatile bool pcm_playing;
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extern volatile bool pcm_paused;
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void pcm_play_dma_lock(void);
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void pcm_play_dma_unlock(void);
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void pcm_play_dma_init(void) INIT_ATTR;
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void pcm_play_dma_postinit(void);
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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_dma_pause(bool pause);
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const void * pcm_play_dma_get_peak_buffer(int *count);
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void pcm_dma_apply_settings(void);
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#ifdef HAVE_RECORDING
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/* DMA transfer in is currently active */
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extern volatile bool pcm_recording;
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/* APIs implemented in the target-specific portion */
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void pcm_rec_dma_init(void);
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void pcm_rec_dma_close(void);
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void pcm_rec_dma_start(void *addr, size_t size);
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void pcm_rec_dma_stop(void);
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const void * pcm_rec_dma_get_peak_buffer(void);
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static FORCE_INLINE enum pcm_dma_status
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pcm_rec_dma_status_callback(enum pcm_dma_status status)
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{
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extern enum pcm_dma_status
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(* volatile pcm_rec_status_callback)(enum pcm_dma_status);
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return pcm_call_status_cb(pcm_rec_status_callback, status);
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}
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/* Called by the bottom layer ISR when more data is needed. Returns true
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* if a new buffer is available, false otherwise. */
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bool pcm_rec_dma_complete_callback(enum pcm_dma_status status,
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void **addr, size_t *size);
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#ifdef HAVE_PCM_REC_DMA_ADDRESS
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#define pcm_rec_dma_addr(addr) pcm_dma_addr(addr)
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#else
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#define pcm_rec_dma_addr(addr) addr
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#endif
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#endif /* HAVE_RECORDING */
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#endif /* PCM_INTERNAL_H */
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