6c868dd48f
Just use long so the compiler potentially doesn't complain about use of other values not in the enum. It's also the type used around the system for event ids. Increase min codec API version. No functional changes. Change-Id: If4419b42912f5e4ef673adcdeb69313e503f94cc
143 lines
3.6 KiB
C
143 lines
3.6 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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param = ci->id3->elapsed;
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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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if (param) {
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goto resume_start;
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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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long 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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resume_start:
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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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