13cbade08a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30397 a1c6a512-1295-4272-9138-f99709370657
137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
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/* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
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#include <codecs/lib/codeclib.h>
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#include "libgme/ay_emu.h"
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CODEC_HEADER
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/* Maximum number of bytes to process in one iteration */
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#define CHUNK_SIZE (1024*2)
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static int16_t samples[CHUNK_SIZE] IBSS_ATTR;
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static struct Ay_Emu ay_emu;
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/****************** rockbox interface ******************/
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static void set_codec_track(int t, int multitrack) {
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Ay_start_track(&ay_emu, t);
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/* for loop mode we disable track limits */
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if (!ci->loop_track()) {
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Track_set_fade(&ay_emu, Track_get_length( &ay_emu, t ) - 4000, 4000);
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}
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if (multitrack) ci->set_elapsed(t*1000); /* t is track no to display */
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else ci->set_elapsed(0);
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}
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/* this is the codec entry point */
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enum codec_status codec_main(enum codec_entry_call_reason reason)
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{
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if (reason == CODEC_LOAD) {
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/* we only render 16 bits */
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ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
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/* 44 Khz, Interleaved stereo */
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ci->configure(DSP_SET_FREQUENCY, 44100);
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ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
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Ay_init(&ay_emu);
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Ay_set_sample_rate(&ay_emu, 44100);
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}
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return CODEC_OK;
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}
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/* this is called for each file to process */
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enum codec_status codec_run(void)
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{
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blargg_err_t err;
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uint8_t *buf;
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size_t n;
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int track, is_multitrack;
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intptr_t param;
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uint32_t elapsed_time;
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/* reset values */
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track = is_multitrack = 0;
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elapsed_time = 0;
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DEBUGF("AY: next_track\n");
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if (codec_init()) {
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return CODEC_ERROR;
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}
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codec_set_replaygain(ci->id3);
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/* Read the entire file */
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DEBUGF("AY: request file\n");
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ci->seek_buffer(0);
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buf = ci->request_buffer(&n, ci->filesize);
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if (!buf || n < (size_t)ci->filesize) {
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DEBUGF("AY: file load failed\n");
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return CODEC_ERROR;
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}
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if ((err = Ay_load_mem(&ay_emu, buf, ci->filesize))) {
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DEBUGF("AY: Ay_load_mem failed (%s)\n", err);
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return CODEC_ERROR;
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}
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/* Update internal track count */
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if (ay_emu.m3u.size > 0)
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ay_emu.track_count = ay_emu.m3u.size;
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/* Check if file has multiple tracks */
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if (ay_emu.track_count > 1) {
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is_multitrack = 1;
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}
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next_track:
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set_codec_track(track, is_multitrack);
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/* The main decoder loop */
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while (1) {
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enum codec_command_action action = ci->get_command(¶m);
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if (action == CODEC_ACTION_HALT)
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break;
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if (action == CODEC_ACTION_SEEK_TIME) {
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if (is_multitrack) {
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track = param/1000;
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ci->seek_complete();
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if (track >= ay_emu.track_count) break;
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goto next_track;
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}
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ci->set_elapsed(param);
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elapsed_time = param;
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Track_seek(&ay_emu, param);
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ci->seek_complete();
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/* Set fade again */
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if (!ci->loop_track()) {
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Track_set_fade(&ay_emu, Track_get_length( &ay_emu, track ) - 4000, 4000);
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}
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}
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/* Generate audio buffer */
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err = Ay_play(&ay_emu, CHUNK_SIZE, samples);
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if (err || Track_ended(&ay_emu)) {
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track++;
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if (track >= ay_emu.track_count) break;
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goto next_track;
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}
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ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1);
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/* Set elapsed time for one track files */
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if (!is_multitrack) {
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elapsed_time += (CHUNK_SIZE / 2) * 10 / 441;
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ci->set_elapsed(elapsed_time);
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}
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}
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return CODEC_OK;
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}
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