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

1 files changed, 108 insertions, 0 deletions

diff --git a/apps/codecs/gbs.c b/apps/codecs/gbs.c
new file mode 100644
index 0000000000..bc6d31e6b8
--- /dev/null
+++ b/apps/codecs/gbs.c
@@ -0,0 +1,108 @@
+
+/* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
+
+#include <codecs/lib/codeclib.h>
+#include "libgme/gbs_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 Gbs_Emu gbs_emu IDATA_ATTR CACHEALIGN_ATTR;
+
+/****************** rockbox interface ******************/
+
+static void set_codec_track(int t) {
+    Gbs_start_track(&gbs_emu, t); 
+
+    /* for REPEAT_ONE we disable track limits */
+    if (ci->global_settings->repeat_mode != REPEAT_ONE) {
+        Track_set_fade(&gbs_emu, Track_get_length( &gbs_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);
+
+        Gbs_init(&gbs_emu);
+        Gbs_set_sample_rate(&gbs_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;
+    intptr_t param;
+    int track = 0;
+
+    DEBUGF("GBS: next_track\n");
+    if (codec_init()) {
+        return CODEC_ERROR;
+    }
+
+    codec_set_replaygain(ci->id3);
+
+    /* Read the entire file */
+    DEBUGF("GBS: request file\n");
+    ci->seek_buffer(0);
+    buf = ci->request_buffer(&n, ci->filesize);
+    if (!buf || n < (size_t)ci->filesize) {
+        DEBUGF("GBS: file load failed\n");
+        return CODEC_ERROR;
+    }
+   
+    if ((err = Gbs_load(&gbs_emu, buf, ci->filesize))) {
+        DEBUGF("GBS: Gbs_load failed (%s)\n", err);
+        return CODEC_ERROR;
+    }
+
+    /* Update internal track count */
+    if (gbs_emu.m3u.size > 0)
+        gbs_emu.track_count = gbs_emu.m3u.size;
+
+next_track:
+    set_codec_track(track);
+
+    /* The main decoder loop */
+    while (1) {
+        enum codec_command_action action = ci->get_command(&param);
+
+        if (action == CODEC_ACTION_HALT)
+            break;
+
+        if (action == CODEC_ACTION_SEEK_TIME) {
+            track = param/1000;
+            ci->seek_complete();
+            if (track >= gbs_emu.track_count) break;
+            goto next_track;
+        }
+
+        /* Generate audio buffer */
+        err = Gbs_play(&gbs_emu, CHUNK_SIZE, samples);
+        if (err || gbs_emu.track_ended) {
+            track++;
+            if (track >= gbs_emu.track_count) break;
+            goto next_track;
+        }
+
+        ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1);
+    }
+
+    return CODEC_OK;
+}