common.h

mpeg 2 source code for video compression

/*
	common: anything can happen here... frame reading, output, messages

	copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
	see COPYING and AUTHORS files in distribution or http://mpg123.de
	initially written by Michael Hipp
*/

#ifndef _MPG123_COMMON_H_
#define _MPG123_COMMON_H_

/* max = 1728 */
#define MAXFRAMESIZE 3456
#define HDRCMPMASK 0xfffffd00

extern unsigned long firsthead;
extern int tabsel_123[2][3][16];
extern double compute_tpf(struct frame *fr);
extern double compute_bpf(struct frame *fr);
extern long compute_buffer_offset(struct frame *fr);

struct bitstream_info {
  int bitindex;
  unsigned char *wordpointer;
};

extern struct bitstream_info bsi;

/* well, I take that one for granted... at least layer3 */
#define DECODER_DELAY 529

#ifdef GAPLESS
unsigned long samples_to_bytes(unsigned long s, struct frame *fr , struct audio_info_struct* ai);
/* samples per frame ...
Layer I
Layer II
Layer III
MPEG-1
384
1152
1152
MPEG-2 LSF
384
1152
576
MPEG 2.5
384
1152
576
*/
#define spf(fr) (fr->lay == 1 ? 384 : (fr->lay==2 ? 1152 : (fr->lsf || fr->mpeg25 ? 576 : 1152)))
/* still fine-tuning the "real music" window... see read_frame */
#define GAP_SHIFT -1
#endif

/* for control_generic */
extern const char* remote_header_help;
void make_remote_header(struct frame* fr, char *target);

int position_info(struct frame* fr, long buffsize, struct audio_info_struct* ai,
                   unsigned long* frames_left, double* current_seconds, double* seconds_left);

int read_frame_recover(struct frame* fr);

off_t frame_index_find(unsigned long want_frame, unsigned long* get_frame);
void print_frame_index(FILE* out);

/* this could become a struct... */
extern long lastscale;
extern int rva_level[2];
extern float rva_gain[2];
extern float rva_peak[2];

#endif