mirror of
https://github.com/Rockbox/rockbox.git
synced 2025-10-29 00:36:22 -04:00
f40bfc9267
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
|
|
/* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
|
|
|
|
#include <codecs/lib/codeclib.h>
|
|
#include "libgme/ay_emu.h"
|
|
|
|
CODEC_HEADER
|
|
|
|
/* Maximum number of bytes to process in one iteration */
|
|
#define CHUNK_SIZE (1024*2)
|
|
|
|
static int16_t samples[CHUNK_SIZE] IBSS_ATTR;
|
|
static struct Ay_Emu ay_emu;
|
|
|
|
/****************** rockbox interface ******************/
|
|
|
|
static void set_codec_track(int t, int multitrack) {
|
|
Ay_start_track(&ay_emu, t);
|
|
|
|
/* for loop mode we disable track limits */
|
|
if (!ci->loop_track()) {
|
|
Track_set_fade(&ay_emu, Track_get_length( &ay_emu, t ) - 4000, 4000);
|
|
}
|
|
if (multitrack) ci->set_elapsed(t*1000); /* t is track no to display */
|
|
else ci->set_elapsed(0);
|
|
}
|
|
|
|
/* this is the codec entry point */
|
|
enum codec_status codec_main(enum codec_entry_call_reason reason)
|
|
{
|
|
if (reason == CODEC_LOAD) {
|
|
/* we only render 16 bits */
|
|
ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
|
|
|
|
/* 44 Khz, Interleaved stereo */
|
|
ci->configure(DSP_SET_FREQUENCY, 44100);
|
|
ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
|
|
|
|
Ay_init(&ay_emu);
|
|
Ay_set_sample_rate(&ay_emu, 44100);
|
|
}
|
|
|
|
return CODEC_OK;
|
|
}
|
|
|
|
/* this is called for each file to process */
|
|
enum codec_status codec_run(void)
|
|
{
|
|
blargg_err_t err;
|
|
uint8_t *buf;
|
|
size_t n;
|
|
int track, is_multitrack;
|
|
intptr_t param;
|
|
uint32_t elapsed_time;
|
|
|
|
/* reset values */
|
|
track = is_multitrack = 0;
|
|
elapsed_time = 0;
|
|
|
|
DEBUGF("AY: next_track\n");
|
|
if (codec_init()) {
|
|
return CODEC_ERROR;
|
|
}
|
|
|
|
codec_set_replaygain(ci->id3);
|
|
|
|
/* Read the entire file */
|
|
DEBUGF("AY: request file\n");
|
|
ci->seek_buffer(0);
|
|
buf = ci->request_buffer(&n, ci->filesize);
|
|
if (!buf || n < (size_t)ci->filesize) {
|
|
DEBUGF("AY: file load failed\n");
|
|
return CODEC_ERROR;
|
|
}
|
|
|
|
if ((err = Ay_load_mem(&ay_emu, buf, ci->filesize))) {
|
|
DEBUGF("AY: Ay_load_mem failed (%s)\n", err);
|
|
return CODEC_ERROR;
|
|
}
|
|
|
|
/* Update internal track count */
|
|
if (ay_emu.m3u.size > 0)
|
|
ay_emu.track_count = ay_emu.m3u.size;
|
|
|
|
/* Check if file has multiple tracks */
|
|
if (ay_emu.track_count > 1) {
|
|
is_multitrack = 1;
|
|
}
|
|
|
|
next_track:
|
|
set_codec_track(track, is_multitrack);
|
|
|
|
/* The main decoder loop */
|
|
while (1) {
|
|
enum codec_command_action action = ci->get_command(¶m);
|
|
|
|
if (action == CODEC_ACTION_HALT)
|
|
break;
|
|
|
|
if (action == CODEC_ACTION_SEEK_TIME) {
|
|
if (is_multitrack) {
|
|
track = param/1000;
|
|
ci->seek_complete();
|
|
if (track >= ay_emu.track_count) break;
|
|
goto next_track;
|
|
}
|
|
|
|
ci->set_elapsed(param);
|
|
elapsed_time = param;
|
|
Track_seek(&ay_emu, param);
|
|
ci->seek_complete();
|
|
|
|
/* Set fade again */
|
|
if (!ci->loop_track()) {
|
|
Track_set_fade(&ay_emu, Track_get_length( &ay_emu, track ) - 4000, 4000);
|
|
}
|
|
}
|
|
|
|
/* Generate audio buffer */
|
|
err = Ay_play(&ay_emu, CHUNK_SIZE, samples);
|
|
if (err || Track_ended(&ay_emu)) {
|
|
track++;
|
|
if (track >= ay_emu.track_count) break;
|
|
goto next_track;
|
|
}
|
|
|
|
ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1);
|
|
|
|
/* Set elapsed time for one track files */
|
|
if (!is_multitrack) {
|
|
elapsed_time += (CHUNK_SIZE / 2) * 10 / 441;
|
|
ci->set_elapsed(elapsed_time);
|
|
}
|
|
}
|
|
|
|
return CODEC_OK;
|
|
}
|