From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001
From: Sean Bartell <wingedtachikoma@gmail.com>
Date: Sat, 25 Jun 2011 21:32:25 -0400
Subject: Add codecs to librbcodec.
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Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
---
 lib/rbcodec/codecs/vgm.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 lib/rbcodec/codecs/vgm.c

(limited to 'lib/rbcodec/codecs/vgm.c')

diff --git a/lib/rbcodec/codecs/vgm.c b/lib/rbcodec/codecs/vgm.c
new file mode 100644
index 0000000000..416f772f1d
--- /dev/null
+++ b/lib/rbcodec/codecs/vgm.c
@@ -0,0 +1,142 @@
+
+/* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
+/* Inflate code taken from WikiViewer plugin by Adam Gashlin */
+
+#include <codecs/lib/codeclib.h>
+
+#include "libgme/blargg_endian.h"
+#include "libgme/vgm_emu.h" 
+#include "libgme/inflate/mallocer.h"
+#include "libgme/inflate/inflate.h"
+
+CODEC_HEADER
+
+/* Maximum number of bytes to process in one iteration */
+#define CHUNK_SIZE (1024*4)
+#define MAINMEMBUF 0
+
+static int16_t samples[CHUNK_SIZE] IBSS_ATTR;
+static struct Vgm_Emu vgm_emu;
+
+static void *inflatebuf;              /* heap for gunzip */
+static char *songbuf;               /* destination for uncompressed song */
+static uint32_t songbuflen=0;  /* size of the song buffer */
+static uint32_t songlen=0;       /* used size of the song buffer */
+
+/****************** rockbox interface ******************/
+
+/* 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);
+
+        /* 32 Khz, Interleaved stereo */
+        ci->configure(DSP_SET_FREQUENCY, 44100);
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
+
+        Vgm_init(&vgm_emu);
+        Vgm_set_sample_rate(&vgm_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;
+
+    uint32_t elapsed_time = 0;
+
+    DEBUGF("VGM: next_track\n");
+    if (codec_init()) {
+        return CODEC_ERROR;
+    }
+
+    codec_set_replaygain(ci->id3);
+
+    /* Read the entire file */
+    DEBUGF("VGM: request file\n");
+    ci->seek_buffer(0);
+    buf = ci->request_buffer(&n, ci->filesize);
+    if (!buf) {
+        DEBUGF("VGM: file load failed\n");
+        return CODEC_ERROR;
+    }
+    
+    /* If couldn't get the whole buffer
+        will trim file and put and 'end_command'
+        at the end*/
+    if (n < (size_t)ci->filesize) {
+        DEBUGF("VGM: file was trimmed\n");
+    }
+    
+    /* If is gzipped decompress it */
+    if ( get_le16( buf ) == 0x8b1f ) {
+        wpw_init_mempool(MAINMEMBUF);
+        inflatebuf=wpw_malloc(MAINMEMBUF,0x13500);
+            
+        /* Will use available remaining memory 
+            as output buffer */
+        songbuflen=wpw_available(MAINMEMBUF);
+        songbuf=wpw_malloc(MAINMEMBUF,songbuflen);
+
+        songlen=decompress(buf,n,songbuf,songbuflen,0,inflatebuf);  
+
+        if ((err = Vgm_load_mem(&vgm_emu, songbuf, songlen, true))) {
+            DEBUGF("VGM: Vgm_load_mem failed (%s)\n", err);
+            return CODEC_ERROR;
+        }
+
+        /* Since metadata parser doesn't support VGZ 
+             will set song length here */
+        ci->id3->length = Track_get_length( &vgm_emu );
+    }
+    else if ((err = Vgm_load_mem(&vgm_emu, buf, n, false))) {
+        DEBUGF("VGM: Vgm_load failed_mem (%s)\n", err);
+        return CODEC_ERROR;
+    }
+
+    Vgm_start_track(&vgm_emu); 
+
+    /* for REPEAT_ONE we disable track limits */
+    if (!ci->loop_track()) {
+        Track_set_fade(&vgm_emu, ci->id3->length - 4000, 4000);
+    }
+    
+    ci->set_elapsed(0);
+
+    /* 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) {
+            ci->set_elapsed(param);
+            elapsed_time = param;
+            Track_seek(&vgm_emu, param);
+            ci->seek_complete();
+            
+            /* Set fade again in case we seek to start of song */
+            Track_set_fade(&vgm_emu, ci->id3->length - 4000, 4000);
+        }
+
+        /* Generate audio buffer */
+        err = Vgm_play(&vgm_emu, CHUNK_SIZE, samples);
+        if (err || Track_ended(&vgm_emu)) break;
+
+        ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1);
+
+        elapsed_time += (CHUNK_SIZE / 2) * 10 / 441;
+        ci->set_elapsed(elapsed_time);
+    }
+
+    return CODEC_OK;
+}
-- 
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