revive GP2X build, update
[picodrive.git] / platform / common / mp3_helix.c
CommitLineData
cff531af 1/*
2 * Some mp3 related code for Sega/Mega CD.
3 * Uses the Helix Fixed-point MP3 decoder
4 * (C) notaz, 2007-2009
5 *
6 * This work is licensed under the terms of MAME license.
7 * See COPYING file in the top-level directory.
8 */
da42200b 9
10#include <stdio.h>
11#include <string.h>
12
7c34867a 13#include <pico/pico_int.h>
14#include <pico/sound/mix.h>
da42200b 15#include "helix/pub/mp3dec.h"
7c34867a 16#include "mp3.h"
da42200b 17#include "lprintf.h"
18
fc11dd05 19static HMP3Decoder mp3dec;
20static unsigned char mp3_input_buffer[2 * 1024];
da42200b 21
7c34867a 22#ifdef __GP2X__
23#define mp3_update mp3_update_local
24#define mp3_start_play mp3_start_play_local
25#endif
da42200b 26
fc11dd05 27int mp3dec_decode(FILE *f, int *file_pos, int file_len)
da42200b 28{
29 unsigned char *readPtr;
30 int bytesLeft;
31 int offset; // mp3 frame offset from readPtr
7c34867a 32 int had_err;
33 int err = 0;
da42200b 34
35 do
36 {
fc11dd05 37 if (*file_pos >= file_len)
7c34867a 38 return 1; /* EOF, nothing to do */
da42200b 39
fc11dd05 40 fseek(f, *file_pos, SEEK_SET);
41 bytesLeft = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), f);
da42200b 42
7c18e34a 43 offset = mp3_find_sync_word(mp3_input_buffer, bytesLeft);
da42200b 44 if (offset < 0) {
fc11dd05 45 lprintf("find_sync_word (%i/%i) err %i\n",
46 *file_pos, file_len, offset);
47 *file_pos = file_len;
da42200b 48 return 1; // EOF
49 }
50 readPtr = mp3_input_buffer + offset;
51 bytesLeft -= offset;
52
7c34867a 53 had_err = err;
c9e1affc 54 err = MP3Decode(mp3dec, &readPtr, &bytesLeft, cdda_out_buffer, 0);
da42200b 55 if (err) {
7c34867a 56 if (err == ERR_MP3_MAINDATA_UNDERFLOW && !had_err) {
57 // just need another frame
fc11dd05 58 *file_pos += readPtr - mp3_input_buffer;
7c34867a 59 continue;
60 }
61 if (err == ERR_MP3_INDATA_UNDERFLOW && !had_err) {
da42200b 62 if (offset == 0)
63 // something's really wrong here, frame had to fit
fc11dd05 64 *file_pos = file_len;
da42200b 65 else
fc11dd05 66 *file_pos += offset;
da42200b 67 continue;
7c34867a 68 }
69 if (-12 <= err && err <= -6) {
da42200b 70 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
71 // just try to skip the offending frame..
fc11dd05 72 *file_pos += offset + 1;
da42200b 73 continue;
74 }
fc11dd05 75 lprintf("MP3Decode err (%i/%i) %i\n",
76 *file_pos, file_len, err);
77 *file_pos = file_len;
da42200b 78 return 1;
79 }
fc11dd05 80 *file_pos += readPtr - mp3_input_buffer;
da42200b 81 }
82 while (0);
83
84 return 0;
85}
86
75a30842 87int mp3dec_start(FILE *f, int fpos_start)
da42200b 88{
7c34867a 89 // must re-init decoder for new track
90 if (mp3dec)
91 MP3FreeDecoder(mp3dec);
92 mp3dec = MP3InitDecoder();
da42200b 93
fc11dd05 94 return (mp3dec == 0) ? -1 : 0;
da42200b 95}