code940 now plays mp3s

[picodrive.git] / platform / gp2x / code940 / 940.c

diff --git a/platform/gp2x/940.c b/platform/gp2x/code940/940.c
similarity index 52%
rename from platform/gp2x/940.c
rename to platform/gp2x/code940/940.c
index e94bf21..e0c4002 100644 (file)
--- a/platform/gp2x/940.c
+++ b/platform/gp2x/code940/940.c
@@ -1,7 +1,8 @@
 #include "940shared.h"\r
 \r
-static _940_data_t *shared_data = (_940_data_t *) 0x100000;\r
-static _940_ctl_t  *shared_ctl  = (_940_ctl_t *)  0x200000;\r
+static _940_data_t *shared_data = (_940_data_t *)   0x00100000;\r
+static _940_ctl_t  *shared_ctl  = (_940_ctl_t *)    0x00200000;\r
+static unsigned char *mp3_data  = (unsigned char *) 0x01000000;\r
 YM2612 *ym2612_940;\r
 int *mix_buffer;\r
 \r
@@ -22,17 +23,17 @@ void Main940(int startvector)
 \r
        // debug\r
        shared_ctl->vstarts[startvector]++;\r
-       asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r
+       // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r
 \r
 \r
-       for (;; shared_ctl->loopc++)\r
+       for (;;)\r
        {\r
-               int job_num;\r
+               int job_num = 0;\r
 /*\r
                while (!shared_ctl->busy)\r
                {\r
                        //shared_ctl->waitc++;\r
-                       spend_cycles(256);\r
+                       spend_cycles(8*1024);\r
                }\r
 */\r
                if (!shared_ctl->busy)\r
@@ -44,9 +45,12 @@ void Main940(int startvector)
                {\r
                        switch (shared_ctl->jobs[job_num])\r
                        {\r
-                               case JOB940_YM2612INIT:\r
+                               case JOB940_INITALL:\r
+                                       /* ym2612 */\r
                                        shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r
                                        YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r
+                                       /* Helix mp3 decoder */\r
+                                       shared_data->mp3dec = MP3InitDecoder();\r
                                        break;\r
 \r
                                case JOB940_YM2612RESETCHIP:\r
@@ -80,14 +84,51 @@ void Main940(int startvector)
                                        YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);\r
                                        break;\r
                                }\r
+\r
+                               case JOB940_MP3DECODE: {\r
+                                       int mp3_offs = shared_ctl->mp3_offs;\r
+                                       unsigned char *readPtr = mp3_data + mp3_offs;\r
+                                       int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r
+                                       int offset; // frame offset from readPtr\r
+                                       int err;\r
+\r
+                                       if (bytesLeft <= 0) break; // EOF, nothing to do\r
+\r
+                                       offset = MP3FindSyncWord(readPtr, bytesLeft);\r
+                                       if (offset < 0) {\r
+                                               shared_ctl->mp3_offs = shared_ctl->mp3_len;\r
+                                               break; // EOF\r
+                                       }\r
+                                       readPtr += offset;\r
+                                       bytesLeft -= offset;\r
+\r
+                                       err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r
+                                               shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r
+                                       if (err) {\r
+                                               if (err == ERR_MP3_INDATA_UNDERFLOW) {\r
+                                                       shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF\r
+                                                       break;\r
+                                               } else if (err <= -6 && err >= -12) {\r
+                                                       // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r
+                                                       // just try to skip the offending frame..\r
+                                                       readPtr++;\r
+                                               }\r
+                                               shared_ctl->mp3_errors++;\r
+                                               shared_ctl->mp3_lasterr = err;\r
+                                       }\r
+                                       shared_ctl->mp3_offs = readPtr - mp3_data;\r
+                                       break;\r
+                               }\r
                        }\r
                }\r
 \r
-               shared_ctl->busy = 0;\r
-//             cache_clean_flush();\r
                cache_clean();\r
 //             asm volatile ("mov r0, #0" ::: "r0");\r
 //             asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r
+//             cache_clean_flush();\r
+\r
+               shared_ctl->loopc++;\r
+               shared_ctl->busy = 0;\r
        }\r
 }\r
 \r