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/* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
#define GME_NSF_TYPE
#include <codecs/lib/codeclib.h>
#include "libgme/nsf_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 Nsf_Emu nsf_emu;
/****************** rockbox interface ******************/
static void set_codec_track(int t, int multitrack) {
Nsf_start_track(&nsf_emu, t);
/* for REPEAT_ONE we disable track limits */
if (!ci->loop_track()) {
Track_set_fade(&nsf_emu, Track_length( &nsf_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);
Nsf_init(&nsf_emu);
Nsf_set_sample_rate(&nsf_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;
uint32_t elapsed_time;
intptr_t param;
track = is_multitrack = 0;
elapsed_time = 0;
DEBUGF("NSF: next_track\n");
if (codec_init()) {
return CODEC_ERROR;
}
codec_set_replaygain(ci->id3);
/* Read the entire file */
DEBUGF("NSF: request file\n");
ci->seek_buffer(0);
buf = ci->request_buffer(&n, ci->filesize);
if (!buf || n < (size_t)ci->filesize) {
DEBUGF("NSF: file load failed\n");
return CODEC_ERROR;
}
if ((err = Nsf_load_mem(&nsf_emu, buf, ci->filesize))) {
DEBUGF("NSF: Nsf_load_mem failed (%s)\n", err);
return CODEC_ERROR;
}
/* Update internal track count */
if (nsf_emu.m3u.size > 0)
nsf_emu.track_count = nsf_emu.m3u.size;
if (nsf_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 >= nsf_emu.track_count) break;
goto next_track;
}
ci->set_elapsed(param);
elapsed_time = param;
Track_seek(&nsf_emu, param);
ci->seek_complete();
/* Set fade again */
if (!ci->loop_track()) {
Track_set_fade(&nsf_emu, Track_length( &nsf_emu, track ), 4000);
}
}
/* Generate audio buffer */
err = Nsf_play(&nsf_emu, CHUNK_SIZE, samples);
if (err || Track_ended(&nsf_emu)) {
track++;
if (track >= nsf_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 == 0) {
elapsed_time += (CHUNK_SIZE / 2) * 10 / 441;
ci->set_elapsed(elapsed_time);
}
}
return CODEC_OK;
}
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