rockbox - My Rockbox tree

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/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 by Miika Pekkarinen
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include <stdbool.h>
#include <stdio.h>
#include "config.h"
#include "debug.h"
#include "panic.h"
#include <kernel.h>
#include "pcmbuf.h"
#include "pcm.h"
#include "logf.h"
#ifndef SIMULATOR
#include "cpu.h"
#endif
#include "system.h"
#include <string.h>
#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) \
    && !defined(HAVE_WM8978)
#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.
 */


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