127f14210f
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6589 a1c6a512-1295-4272-9138-f99709370657
138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
#include "rockmacros.h"
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#include "defs.h"
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#include "pcm.h"
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#include "rc.h"
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struct pcm pcm;
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#define BUF_SIZE (8192)
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#define DMA_PORTION (1024)
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static short buf1_unal[(BUF_SIZE / sizeof(short)) + 2]; // to make sure 4 byte aligned
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rcvar_t pcm_exports[] =
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{
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RCV_END
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};
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/*#if CONFIG_HWCODEC == MASNONE && !defined(SIMULATOR)
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* disabled cause it crashes with current audio implementation.. no sound.
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*/
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#if 0
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static short* buf1;
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static short front_buf[512];
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static short* last_back_pos;
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static bool newly_started;
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static int turns;
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void pcm_init(void)
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{
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buf1 = (signed short*)((((unsigned int)buf1_unal) >> 2) << 2); /* here i just make sure that buffer is aligned to 4 bytes*/
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newly_started = true;
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last_back_pos = buf1;
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turns = 0;
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pcm.hz = 11025;
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pcm.stereo = 1;
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pcm.buf = front_buf;
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pcm.len = (sizeof(front_buf)) / sizeof(short); /* length in shorts, not bytes */
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pcm.pos = 0;
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rb->pcm_play_stop();
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rb->pcm_set_frequency(11025);
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rb->pcm_set_volume(200);
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}
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void pcm_close(void)
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{
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memset(&pcm, 0, sizeof pcm);
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newly_started = true;
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last_back_pos = buf1;
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rb->pcm_play_stop();
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}
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void get_more(unsigned char** start, long* size)
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{
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int length;
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unsigned int sar = (unsigned int)SAR0;
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length = ((unsigned int)buf1) + BUF_SIZE - sar;
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if(turns > 0)
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{
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newly_started = true;
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last_back_pos = buf1;
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turns = 0;
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return;
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} /* sound will stop if no one feeds data*/
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if(length <= 0)
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{
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*start = (unsigned char*)buf1;
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*size = DMA_PORTION;
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turns++;
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}
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else
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{
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*start = (unsigned char*)sar;
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if(length > DMA_PORTION)
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*size = DMA_PORTION;
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else
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*size = length;
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}
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}
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int pcm_submit(void)
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{
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while( (turns < 0) && ((((unsigned int)last_back_pos) + pcm.pos * sizeof(short)) > ((unsigned int)SAR0)) && !newly_started) rb->yield(); /* wait until data is passed through DAC or until exit*/
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int shorts_left = ((((unsigned int)buf1) + BUF_SIZE) - ((unsigned int)last_back_pos)) / sizeof(short);
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if( shorts_left >= pcm.pos )
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{
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memcpy(last_back_pos,pcm.buf,pcm.pos * sizeof(short));
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last_back_pos = &last_back_pos[pcm.pos];
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}
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else
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{
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int last_pos = shorts_left;
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memcpy(last_back_pos,pcm.buf,shorts_left * sizeof(short));
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last_back_pos = buf1;
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shorts_left = pcm.pos - shorts_left;
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memcpy(last_back_pos,&pcm.buf[last_pos],shorts_left * sizeof(short));
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last_back_pos = &buf1[shorts_left];
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turns--;
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}
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if(newly_started)
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{
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rb->pcm_play_data((unsigned char*)buf1,pcm.pos * sizeof(short),&get_more);
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newly_started = false;
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}
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pcm.pos = 0;
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return 1;
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}
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#else
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void pcm_init(void)
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{
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pcm.hz = 11025;
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pcm.stereo = 1;
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pcm.buf = buf1_unal;
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pcm.len = (BUF_SIZE / sizeof(short));
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pcm.pos = 0;
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}
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void pcm_close(void)
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{
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memset(&pcm, 0, sizeof pcm);
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}
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int pcm_submit(void)
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{
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pcm.pos =0;
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return 0;
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}
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#endif
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