From acb0917556fc33681c1df5a530cf754193e67705 Mon Sep 17 00:00:00 2001 From: Andree Buschmann Date: Sun, 7 Aug 2011 20:01:04 +0000 Subject: Submit initial patch from FS#12176. Adds support for several new game music formats (AY, GBS, HES, KSS, SGC, VGM and VGZ) and replaces the current NSF and NSFE with a new implementation based on a port of the Game Music Emu library 'GME'. This first submit does not cover the full functionality provided by the author's original patch: Coleco-SGV is not supported, some GME-specific m3u-support has been removed and IRAM is not used yet. Further changes are very likely to follow this submit. Thanks to Mauricio Garrido. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30264 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/sgc.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 apps/codecs/sgc.c (limited to 'apps/codecs/sgc.c') diff --git a/apps/codecs/sgc.c b/apps/codecs/sgc.c new file mode 100644 index 0000000000..e5f0299980 --- /dev/null +++ b/apps/codecs/sgc.c @@ -0,0 +1,123 @@ + +/* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */ + +#include +#include "libgme/sgc_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 Sgc_Emu sgc_emu IDATA_ATTR CACHEALIGN_ATTR; + +/* Coleco Bios */ +/* Colecovision not supported yet +static char coleco_bios[0x2000]; +*/ + +/****************** rockbox interface ******************/ + +static void set_codec_track(int t) { + Sgc_start_track(&sgc_emu, t); + + /* for REPEAT_ONE we disable track limits */ + if (ci->global_settings->repeat_mode != REPEAT_ONE) { + Track_set_fade(&sgc_emu, Track_get_length( &sgc_emu, t ), 4000); + } + ci->set_elapsed(t*1000); /* t is track no to display */ +} + +/* 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); + + Sgc_init(&sgc_emu); + Sgc_set_sample_rate(&sgc_emu, 44100); + + /* set coleco bios, should be named coleco_bios.rom */ + /* Colecovision not supported yet + int fd = ci->open("/coleco_bios.rom", O_RDONLY); + if ( fd >= 0 ) { + ci->read(fd, coleco_bios, 0x2000); + ci->close(fd); + set_coleco_bios( &sgc_emu, coleco_bios ); + } + */ + } + + 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; + intptr_t param; + int track = 0; + + DEBUGF("SGC: next_track\n"); + if (codec_init()) { + return CODEC_ERROR; + } + + codec_set_replaygain(ci->id3); + + /* Read the entire file */ + DEBUGF("SGC: request file\n"); + ci->seek_buffer(0); + buf = ci->request_buffer(&n, ci->filesize); + if (!buf || n < (size_t)ci->filesize) { + DEBUGF("SGC: file load failed\n"); + return CODEC_ERROR; + } + + if ((err = Sgc_load_mem(&sgc_emu, buf, ci->filesize))) { + DEBUGF("SGC: Sgc_load failed (%s)\n", err); + return CODEC_ERROR; + } + + /* Update internal track count */ + if (sgc_emu.m3u.size > 0) + sgc_emu.track_count = sgc_emu.m3u.size; + +next_track: + set_codec_track(track); + + /* 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) { + track = param/1000; + ci->seek_complete(); + if (track >= sgc_emu.track_count) break; + goto next_track; + } + + /* Generate audio buffer */ + err = Sgc_play(&sgc_emu, CHUNK_SIZE, samples); + if (err || sgc_emu.track_ended) { + track++; + if (track >= sgc_emu.track_count) break; + goto next_track; + } + + ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1); + } + + return CODEC_OK; +} -- cgit v1.2.3