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mpv/mp3lib/sr1.c

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// #define NEWBUFFERING
//#define DEBUG_RESYNC
/* 1 frame = 4608 byte PCM */
#ifdef __GNUC__
#define LOCAL static inline
#else
#define LOCAL static _inline
#endif
//#undef LOCAL
//#define LOCAL
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <math.h>
#define real float
// #define int long
#include "mpg123.h"
#include "huffman.h"
#include "mp3.h"
#include "bswap.h"
#include "../cpudetect.h"
//#include "../liba52/mm_accel.h"
#include "../mp_msg.h"
#include "fastmemcpy.h"
#ifdef ARCH_X86
#define CAN_COMPILE_X86_ASM
#endif
//static FILE* mp3_file=NULL;
int MP3_frames=0;
int MP3_eof=0;
int MP3_pause=0;
int MP3_filesize=0;
int MP3_fpos=0; // current file position
int MP3_framesize=0; // current framesize
int MP3_bitrate=0; // current bitrate
int MP3_samplerate=0; // current samplerate
int MP3_resync=0;
int MP3_channels=0;
int MP3_bps=2;
static long outscale = 32768;
#include "tabinit.c"
#if 1
extern int mplayer_audio_read(char *buf,int size);
LOCAL int mp3_read(char *buf,int size){
// int len=fread(buf,1,size,mp3_file);
int len=mplayer_audio_read(buf,size);
if(len>0) MP3_fpos+=len;
// if(len!=size) MP3_eof=1;
return len;
}
#else
extern int mp3_read(char *buf,int size);
#endif
//void mp3_seek(int pos){
// fseek(mp3_file,pos,SEEK_SET);
// return (MP3_fpos=ftell(mp3_file));
//}
/* Frame reader */
#define MAXFRAMESIZE 1280
#define MAXFRAMESIZE2 (512+MAXFRAMESIZE)
static int fsizeold=0,ssize=0;
static unsigned char bsspace[2][MAXFRAMESIZE2]; /* !!!!! */
static unsigned char *bsbufold=bsspace[0]+512;
static unsigned char *bsbuf=bsspace[1]+512;
static int bsnum=0;
static int bitindex;
static unsigned char *wordpointer;
static int bitsleft;
unsigned char *pcm_sample; /* outbuffer address */
int pcm_point = 0; /* outbuffer offset */
static struct frame fr;
static int tabsel_123[2][3][16] = {
{ {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
{0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
{0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
{ {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
};
static long freqs[9] = { 44100, 48000, 32000, 22050, 24000, 16000 , 11025 , 12000 , 8000 };
LOCAL unsigned int getbits(short number_of_bits)
{
unsigned long rval;
// if(MP3_frames>=7741) printf("getbits: bits=%d bitsleft=%d wordptr=%x\n",number_of_bits,bitsleft,wordpointer);
if((bitsleft-=number_of_bits)<0) return 0;
if(!number_of_bits) return 0;
rval = wordpointer[0];
rval <<= 8;
rval |= wordpointer[1];
rval <<= 8;
rval |= wordpointer[2];
rval <<= bitindex;
rval &= 0xffffff;
bitindex += number_of_bits;
rval >>= (24-number_of_bits);
wordpointer += (bitindex>>3);
bitindex &= 7;
return rval;
}
LOCAL unsigned int getbits_fast(short number_of_bits)
{
unsigned long rval;
// if(MP3_frames>=7741) printf("getbits_fast: bits=%d bitsleft=%d wordptr=%x\n",number_of_bits,bitsleft,wordpointer);
if((bitsleft-=number_of_bits)<0) return 0;
if(!number_of_bits) return 0;
#if defined(CAN_COMPILE_X86_ASM)
rval = bswap_16(*((unsigned short *)wordpointer));
#else
/*
* we may not be able to address unaligned 16-bit data on non-x86 cpus.
* Fall back to some portable code.
*/
rval = wordpointer[0] << 8 | wordpointer[1];
#endif
rval <<= bitindex;
rval &= 0xffff;
bitindex += number_of_bits;
rval >>= (16-number_of_bits);
wordpointer += (bitindex>>3);
bitindex &= 7;
return rval;
}
LOCAL unsigned int get1bit(void)
{
unsigned char rval;
// if(MP3_frames>=7741) printf("get1bit: bitsleft=%d wordptr=%x\n",bitsleft,wordpointer);
if((--bitsleft)<0) return 0;
rval = *wordpointer << bitindex;
bitindex++;
wordpointer += (bitindex>>3);
bitindex &= 7;
return ((rval>>7)&1);
}
LOCAL void set_pointer(long backstep)
{
// if(backstep!=512 && backstep>fsizeold)
// printf("\rWarning! backstep (%d>%d) \n",backstep,fsizeold);
wordpointer = bsbuf + ssize - backstep;
if (backstep) memcpy(wordpointer,bsbufold+fsizeold-backstep,backstep);
bitindex = 0;
bitsleft+=8*backstep;
// printf("Backstep %d (bitsleft=%d)\n",backstep,bitsleft);
}
LOCAL int stream_head_read(unsigned char *hbuf,unsigned long *newhead){
if(mp3_read(hbuf,4) != 4) return FALSE;
#if defined(CAN_COMPILE_X86_ASM)
*newhead = bswap_32(*((unsigned long *)hbuf));
#else
/*
* we may not be able to address unaligned 32-bit data on non-x86 cpus.
* Fall back to some portable code.
*/
*newhead =
hbuf[0] << 24 |
hbuf[1] << 16 |
hbuf[2] << 8 |
hbuf[3];
#endif
return TRUE;
}
LOCAL int stream_head_shift(unsigned char *hbuf,unsigned long *head){
*((unsigned long *)hbuf) >>= 8;
if(mp3_read(hbuf+3,1) != 1) return 0;
*head <<= 8;
*head |= hbuf[3];
return 1;
}
/*
* decode a header and write the information
* into the frame structure
*/
LOCAL int decode_header(struct frame *fr,unsigned long newhead){
// head_check:
if( (newhead & 0xffe00000) != 0xffe00000 ||
(newhead & 0x0000fc00) == 0x0000fc00) return FALSE;
fr->lay = 4-((newhead>>17)&3);
// if(fr->lay!=3) return FALSE;
if( newhead & ((long)1<<20) ) {
fr->lsf = (newhead & ((long)1<<19)) ? 0x0 : 0x1;
fr->mpeg25 = 0;
} else {
fr->lsf = 1;
fr->mpeg25 = 1;
}
if(fr->mpeg25)
fr->sampling_frequency = 6 + ((newhead>>10)&0x3);
else
fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3);
if(fr->sampling_frequency>8) return FALSE; // valid: 0..8
fr->error_protection = ((newhead>>16)&0x1)^0x1;
fr->bitrate_index = ((newhead>>12)&0xf);
fr->padding = ((newhead>>9)&0x1);
fr->extension = ((newhead>>8)&0x1);
fr->mode = ((newhead>>6)&0x3);
fr->mode_ext = ((newhead>>4)&0x3);
fr->copyright = ((newhead>>3)&0x1);
fr->original = ((newhead>>2)&0x1);
fr->emphasis = newhead & 0x3;
MP3_channels = fr->stereo = (fr->mode == MPG_MD_MONO) ? 1 : 2;
if(!fr->bitrate_index){
// fprintf(stderr,"Free format not supported.\n");
return FALSE;
}
switch(fr->lay){
case 2:
MP3_bitrate=tabsel_123[fr->lsf][1][fr->bitrate_index];
MP3_samplerate=freqs[fr->sampling_frequency];
fr->framesize = (long) MP3_bitrate * 144000;
fr->framesize /= MP3_samplerate;
MP3_framesize=fr->framesize;
fr->framesize += fr->padding - 4;
break;
case 3:
if(fr->lsf)
ssize = (fr->stereo == 1) ? 9 : 17;
else
ssize = (fr->stereo == 1) ? 17 : 32;
if(fr->error_protection) ssize += 2;
MP3_bitrate=tabsel_123[fr->lsf][2][fr->bitrate_index];
MP3_samplerate=freqs[fr->sampling_frequency];
fr->framesize = (long) MP3_bitrate * 144000;
fr->framesize /= MP3_samplerate<<(fr->lsf);
MP3_framesize=fr->framesize;
fr->framesize += fr->padding - 4;
break;
case 1:
// fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext<<2)+4 : 32;
MP3_bitrate=tabsel_123[fr->lsf][0][fr->bitrate_index];
MP3_samplerate=freqs[fr->sampling_frequency];
fr->framesize = (long) MP3_bitrate * 12000;
fr->framesize /= MP3_samplerate;
MP3_framesize = ((fr->framesize+fr->padding)<<2);
fr->framesize = MP3_framesize-4;
// printf("framesize=%d\n",fr->framesize);
break;
default:
MP3_framesize=fr->framesize=0;
// fprintf(stderr,"Sorry, unsupported layer type.\n");
return 0;
}
if(fr->framesize<=0 || fr->framesize>MAXFRAMESIZE) return FALSE;
return 1;
}
LOCAL int stream_read_frame_body(int size){
/* flip/init buffer for Layer 3 */
bsbufold = bsbuf;
bsbuf = bsspace[bsnum]+512;
bsnum = (bsnum + 1) & 1;
if( mp3_read(bsbuf,size) != size) return 0; // broken frame
bitindex = 0;
wordpointer = (unsigned char *) bsbuf;
bitsleft=8*size;
return 1;
}
/*****************************************************************
* read next frame return number of frames read.
*/
LOCAL int read_frame(struct frame *fr){
unsigned long newhead;
unsigned char hbuf[8];
int skipped,resyncpos;
int frames=0;
resync:
skipped=MP3_fpos;
resyncpos=MP3_fpos;
set_pointer(512);
fsizeold=fr->framesize; /* for Layer3 */
if(!stream_head_read(hbuf,&newhead)) return 0;
if(!decode_header(fr,newhead)){
// invalid header! try to resync stream!
#ifdef DEBUG_RESYNC
printf("ReSync: searching for a valid header... (pos=%X)\n",MP3_fpos);
#endif
retry1:
while(!decode_header(fr,newhead)){
if(!stream_head_shift(hbuf,&newhead)) return 0;
}
resyncpos=MP3_fpos-4;
// found valid header
#ifdef DEBUG_RESYNC
printf("ReSync: found valid hdr at %X fsize=%ld ",resyncpos,fr->framesize);
#endif
if(!stream_read_frame_body(fr->framesize)) return 0; // read body
set_pointer(512);
fsizeold=fr->framesize; /* for Layer3 */
if(!stream_head_read(hbuf,&newhead)) return 0;
if(!decode_header(fr,newhead)){
// invalid hdr! go back...
#ifdef DEBUG_RESYNC
printf("INVALID\n");
#endif
// mp3_seek(resyncpos+1);
if(!stream_head_read(hbuf,&newhead)) return 0;
goto retry1;
}
#ifdef DEBUG_RESYNC
printf("OK!\n");
++frames;
#endif
}
skipped=resyncpos-skipped;
// if(skipped && !MP3_resync) printf("\r%d bad bytes skipped (resync at 0x%X) \n",skipped,resyncpos);
// printf("%8X [%08X] %d %d (%d)%s%s\n",MP3_fpos-4,newhead,fr->framesize,fr->mode,fr->mode_ext,fr->error_protection?" CRC":"",fr->padding?" PAD":"");
/* read main data into memory */
if(!stream_read_frame_body(fr->framesize)){
printf("\nBroken frame at 0x%X \n",resyncpos);
return 0;
}
++frames;
if(MP3_resync){
MP3_resync=0;
if(frames==1) goto resync;
}
return frames;
}
int _has_mmx = 0; // used by layer2.c, layer3.c to pre-scale coeffs
#include "layer2.c"
#include "layer3.c"
#include "layer1.c"
/******************************************************************************/
/* PUBLIC FUNCTIONS */
/******************************************************************************/
/* It's hidden from gcc in assembler */
extern void dct64_MMX(real *, real *, real *);
extern void dct64_MMX_3dnow(real *, real *, real *);
extern void dct64_MMX_3dnowex(real *, real *, real *);
void (*dct64_MMX_func)(real *, real *, real *);
#include "../cpudetect.h"
// Init decoder tables. Call first, once!
#ifdef USE_FAKE_MONO
void MP3_Init(int fakemono){
#else
void MP3_Init(){
#endif
//gCpuCaps.hasMMX=gCpuCaps.hasMMX2=gCpuCaps.hasSSE=0; // for testing!
_has_mmx = 0;
dct36_func = dct36;
make_decode_tables(outscale);
#ifdef CAN_COMPILE_X86_ASM
if (gCpuCaps.hasMMX)
{
_has_mmx = 1;
make_decode_tables_MMX(outscale);
mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: made decode tables with MMX optimization\n");
synth_func = synth_1to1_MMX;
}
if (gCpuCaps.has3DNowExt)
{
dct36_func=dct36_3dnowex;
dct64_MMX_func= (gCpuCaps.hasMMX2) ? dct64_MMX_3dnowex : dct64_MMX_3dnow;
mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using 3DNow!Ex optimized decore!\n");
}
else
if (gCpuCaps.has3DNow)
{
dct36_func = dct36_3dnow;
dct64_MMX_func = dct64_MMX_3dnow;
mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using 3DNow! optimized decore!\n");
}
else
if (gCpuCaps.hasMMX)
{
dct64_MMX_func = dct64_MMX;
mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using MMX optimized decore!\n");
}
else
if (gCpuCaps.cpuType >= CPUTYPE_I586)
{
synth_func = synth_1to1_pent;
mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using Pentium optimized decore!\n");
}
else
#endif
{
synth_func = NULL; /* use default c version */
mp_msg(MSGT_DECAUDIO,MSGL_V,"mp3lib: using generic C decore!\n");
}
#ifdef USE_FAKE_MONO
if (fakemono == 1)
fr.synth=synth_1to1_l;
else if (fakemono == 2)
fr.synth=synth_1to1_r;
else
fr.synth=synth_1to1;
#else
fr.synth=synth_1to1;
#endif
fr.synth_mono=synth_1to1_mono2stereo;
fr.down_sample=0;
fr.down_sample_sblimit = SBLIMIT>>(fr.down_sample);
init_layer2();
init_layer3(fr.down_sample_sblimit);
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"MP3lib: init layer2&3 finished, tables done\n");
}
#if 0
void MP3_Close(){
MP3_eof=1;
if(mp3_file) fclose(mp3_file);
mp3_file=NULL;
}
// Open a file, init buffers. Call once per file!
int MP3_Open(char *filename,int buffsize){
MP3_eof=1; // lock decoding
MP3_pause=1; // lock playing
if(mp3_file) MP3_Close(); // close prev. file
MP3_frames=0;
mp3_file=fopen(filename,"rb");
// printf("MP3_Open: file='%s'",filename);
// if(!mp3_file){ printf(" not found!\n"); return 0;} else printf("Ok!\n");
if(!mp3_file) return 0;
MP3_filesize=MP3_PrintTAG();
fseek(mp3_file,0,SEEK_SET);
MP3_InitBuffers(buffsize);
if(!tables_done_flag) MP3_Init();
MP3_eof=0; // allow decoding
MP3_pause=0; // allow playing
return MP3_filesize;
}
#endif
// Read & decode a single frame. Called by sound driver.
int MP3_DecodeFrame(unsigned char *hova,short single){
pcm_sample = hova;
pcm_point = 0;
if(!read_frame(&fr))return(0);
if(single==-2){ set_pointer(512); return(1); }
if(fr.error_protection) getbits(16); /* skip crc */
fr.single=single;
switch(fr.lay){
case 2: do_layer2(&fr,single);break;
case 3: do_layer3(&fr,single);break;
case 1: do_layer1(&fr,single);break;
default:
return 0; // unsupported
}
// ++MP3_frames;
return(pcm_point?pcm_point:2);
}
// Prints last frame header in ascii.
void MP3_PrintHeader(){
static char *modes[4] = { "Stereo", "Joint-Stereo", "Dual-Channel", "Single-Channel" };
static char *layers[4] = { "???" , "I", "II", "III" };
mp_msg(MSGT_DECAUDIO,MSGL_V,"\rMPEG %s, Layer %s, %ld Hz %d kbit %s, BPF: %ld\n",
fr.mpeg25 ? "2.5" : (fr.lsf ? "2.0" : "1.0"),
layers[fr.lay],freqs[fr.sampling_frequency],
tabsel_123[fr.lsf][fr.lay-1][fr.bitrate_index],
modes[fr.mode],fr.framesize+4);
mp_msg(MSGT_DECAUDIO,MSGL_V,"Channels: %d, copyright: %s, original: %s, CRC: %s, emphasis: %d\n",
fr.stereo,fr.copyright?"Yes":"No",
fr.original?"Yes":"No",fr.error_protection?"Yes":"No",
fr.emphasis);
}
#if 0
#include "genre.h"
// Read & print ID3 TAG. Do not call when playing!!! returns filesize.
int MP3_PrintTAG(){
struct id3tag {
char tag[3];
char title[30];
char artist[30];
char album[30];
char year[4];
char comment[30];
unsigned char genre;
};
struct id3tag tag;
char title[31]={0,};
char artist[31]={0,};
char album[31]={0,};
char year[5]={0,};
char comment[31]={0,};
char genre[31]={0,};
int fsize;
int ret;
fseek(mp3_file,0,SEEK_END);
fsize=ftell(mp3_file);
if(fseek(mp3_file,-128,SEEK_END)) return fsize;
ret=fread(&tag,128,1,mp3_file);
if(ret!=1 || tag.tag[0]!='T' || tag.tag[1]!='A' || tag.tag[2]!='G') return fsize;
strncpy(title,tag.title,30);
strncpy(artist,tag.artist,30);
strncpy(album,tag.album,30);
strncpy(year,tag.year,4);
strncpy(comment,tag.comment,30);
if ( tag.genre <= sizeof(genre_table)/sizeof(*genre_table) ) {
strncpy(genre, genre_table[tag.genre], 30);
} else {
strncpy(genre,"Unknown",30);
}
// printf("\n");
printf("Title : %30s Artist: %s\n",title,artist);
printf("Album : %30s Year : %4s\n",album,year);
printf("Comment: %30s Genre : %s\n",comment,genre);
printf("\n");
return fsize-128;
}
#endif
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