X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=common%2Fmp3_helix.c;fp=common%2Fmp3_helix.c;h=0000000000000000000000000000000000000000;hb=f506842df2b0e251b56ffe0a828bb2029d423eec;hp=75a4e75e6610c9d4ed11bd0694c4d2f3b1d6d668;hpb=ca69c3e5a0ecf407c02dc85c6f3282ebb1efc5a2;p=libpicofe.git diff --git a/common/mp3_helix.c b/common/mp3_helix.c deleted file mode 100644 index 75a4e75..0000000 --- a/common/mp3_helix.c +++ /dev/null @@ -1,220 +0,0 @@ -// Some mp3 related code for Sega/Mega CD. -// Uses the Helix Fixed-point MP3 decoder - -// (c) Copyright 2007, Grazvydas "notaz" Ignotas - -#include -#include - -#include -#include -#include "helix/pub/mp3dec.h" -#include "mp3.h" -#include "lprintf.h" - -static HMP3Decoder mp3dec = 0; -static FILE *mp3_current_file = NULL; -static int mp3_file_len = 0, mp3_file_pos = 0; -static int mp3_buffer_offs = 0; -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 - -static int try_get_header(unsigned char *buff, MP3FrameInfo *fi) -{ - int ret, offs1, offs = 0; - - while (1) - { - offs1 = mp3_find_sync_word(buff + offs, 2048 - offs); - if (offs1 < 0) return -2; - offs += offs1; - if (2048 - offs < 4) return -3; - - // printf("trying header %08x\n", *(int *)(buff + offs)); - - ret = MP3GetNextFrameInfo(mp3dec, fi, buff + offs); - if (ret == 0 && fi->bitrate != 0) break; - offs++; - } - - return ret; -} - -int mp3_get_bitrate(void *f_, int len) -{ - unsigned char buff[2048]; - MP3FrameInfo fi; - FILE *f = f_; - int ret; - - memset(buff, 0, sizeof(buff)); - - if (mp3dec) - MP3FreeDecoder(mp3dec); - mp3dec = MP3InitDecoder(); - - fseek(f, 0, SEEK_SET); - ret = fread(buff, 1, sizeof(buff), f); - fseek(f, 0, SEEK_SET); - if (ret <= 0) - return -1; - - ret = try_get_header(buff, &fi); - if (ret != 0 || fi.bitrate == 0) { - // try to read somewhere around the middle - fseek(f, len>>1, SEEK_SET); - fread(buff, 1, 2048, f); - fseek(f, 0, SEEK_SET); - ret = try_get_header(buff, &fi); - } - if (ret != 0) - return ret; - - // printf("bitrate: %i\n", fi.bitrate / 1000); - - return fi.bitrate / 1000; -} - -static int mp3_decode(void) -{ - unsigned char *readPtr; - int bytesLeft; - int offset; // mp3 frame offset from readPtr - int had_err; - int err = 0; - - do - { - if (mp3_file_pos >= mp3_file_len) - return 1; /* EOF, nothing to do */ - - fseek(mp3_current_file, mp3_file_pos, SEEK_SET); - bytesLeft = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), mp3_current_file); - - offset = mp3_find_sync_word(mp3_input_buffer, bytesLeft); - if (offset < 0) { - lprintf("find_sync_word (%i/%i) err %i\n", mp3_file_pos, mp3_file_len, offset); - mp3_file_pos = mp3_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 - mp3_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 - mp3_file_pos = mp3_file_len; - else - mp3_file_pos += offset; - continue; - } - if (-12 <= err && err <= -6) { - // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_* - // just try to skip the offending frame.. - mp3_file_pos += offset + 1; - continue; - } - lprintf("MP3Decode err (%i/%i) %i\n", mp3_file_pos, mp3_file_len, err); - mp3_file_pos = mp3_file_len; - return 1; - } - mp3_file_pos += readPtr - mp3_input_buffer; - } - while (0); - - return 0; -} - -void mp3_start_play(void *f_, int pos) -{ - FILE *f = f_; - - mp3_file_len = mp3_file_pos = 0; - mp3_current_file = NULL; - mp3_buffer_offs = 0; - - if (!(PicoOpt & POPT_EN_MCD_CDDA) || f == NULL) // cdda disabled or no file? - return; - - // must re-init decoder for new track - if (mp3dec) - MP3FreeDecoder(mp3dec); - mp3dec = MP3InitDecoder(); - - mp3_current_file = f; - fseek(f, 0, SEEK_END); - mp3_file_len = ftell(f); - - // search for first sync word, skipping stuff like ID3 tags - while (mp3_file_pos < 128*1024) { - int offs, bytes; - - fseek(f, mp3_file_pos, SEEK_SET); - bytes = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), f); - if (bytes < 4) - break; - offs = mp3_find_sync_word(mp3_input_buffer, bytes); - if (offs >= 0) { - mp3_file_pos += offs; - break; - } - mp3_file_pos += bytes - 2; - } - - // seek.. - if (pos) { - unsigned long long pos64 = mp3_file_len - mp3_file_pos; - pos64 *= pos; - mp3_file_pos += pos64 >> 10; - } - - mp3_decode(); -} - -void mp3_update(int *buffer, int length, int stereo) -{ - int length_mp3, shr = 0; - void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32; - - if (mp3_current_file == NULL || mp3_file_pos >= mp3_file_len) - return; /* no file / EOF */ - - length_mp3 = length; - if (PsndRate <= 11025 + 100) { - mix_samples = mix_16h_to_32_s2; - length_mp3 <<= 2; shr = 2; - } - else if (PsndRate <= 22050 + 100) { - mix_samples = mix_16h_to_32_s1; - length_mp3 <<= 1; shr = 1; - } - - if (1152 - mp3_buffer_offs >= length_mp3) { - mix_samples(buffer, cdda_out_buffer + mp3_buffer_offs*2, length<<1); - - mp3_buffer_offs += length_mp3; - } else { - int ret, left = 1152 - mp3_buffer_offs; - - mix_samples(buffer, cdda_out_buffer + mp3_buffer_offs*2, (left>>shr)<<1); - ret = mp3_decode(); - if (ret == 0) { - mp3_buffer_offs = length_mp3 - left; - mix_samples(buffer + ((left>>shr)<<1), cdda_out_buffer, (mp3_buffer_offs>>shr)<<1); - } else - mp3_buffer_offs = 0; - } -} -