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- /*
- * Some mp3 related code for Sega/Mega CD.
- * Uses the Helix Fixed-point MP3 decoder
- * (C) notaz, 2007-2009
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include <stdio.h>
- #include <string.h>
- #include <pico/pico_int.h>
- #include <pico/sound/mix.h>
- #include "helix/pub/mp3dec.h"
- #include "mp3.h"
- #include "lprintf.h"
- static HMP3Decoder mp3dec;
- static unsigned char mp3_input_buffer[2 * 1024];
- #ifdef __GP2X__
- #define mp3_update mp3_update_local
- #define mp3_start_play mp3_start_play_local
- #endif
- int mp3dec_decode(FILE *f, int *file_pos, int file_len)
- {
- unsigned char *readPtr;
- int bytesLeft;
- int offset; // mp3 frame offset from readPtr
- int had_err;
- int err = 0;
- do
- {
- if (*file_pos >= file_len)
- return 1; /* EOF, nothing to do */
- fseek(f, *file_pos, SEEK_SET);
- bytesLeft = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), f);
- offset = mp3_find_sync_word(mp3_input_buffer, bytesLeft);
- if (offset < 0) {
- lprintf("find_sync_word (%i/%i) err %i\n",
- *file_pos, file_len, offset);
- *file_pos = file_len;
- return 1; // EOF
- }
- readPtr = mp3_input_buffer + offset;
- bytesLeft -= offset;
- had_err = err;
- err = MP3Decode(mp3dec, &readPtr, &bytesLeft, cdda_out_buffer, 0);
- if (err) {
- if (err == ERR_MP3_MAINDATA_UNDERFLOW && !had_err) {
- // just need another frame
- *file_pos += readPtr - mp3_input_buffer;
- continue;
- }
- if (err == ERR_MP3_INDATA_UNDERFLOW && !had_err) {
- if (offset == 0)
- // something's really wrong here, frame had to fit
- *file_pos = file_len;
- else
- *file_pos += offset;
- continue;
- }
- if (-12 <= err && err <= -6) {
- // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
- // just try to skip the offending frame..
- *file_pos += offset + 1;
- continue;
- }
- lprintf("MP3Decode err (%i/%i) %i\n",
- *file_pos, file_len, err);
- *file_pos = file_len;
- return 1;
- }
- *file_pos += readPtr - mp3_input_buffer;
- }
- while (0);
- return 0;
- }
- int mp3dec_start(FILE *f, int fpos_start)
- {
- // must re-init decoder for new track
- if (mp3dec)
- MP3FreeDecoder(mp3dec);
- mp3dec = MP3InitDecoder();
- return (mp3dec == 0) ? -1 : 0;
- }
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