mpegaudio.h

来自「F:图像处理资料264264书籍ffmpeg-0.4.9-pre1VideoSt」· C头文件 代码 · 共 32 行

/**
 * @file mpegaudio.h
 * mpeg audio declarations for both encoder and decoder.
 */

/* max frame size, in samples */
#define MPA_FRAME_SIZE 1152 

/* max compressed frame size */
#define MPA_MAX_CODED_FRAME_SIZE 1792

#define MPA_MAX_CHANNELS 2

#define SBLIMIT 32 /* number of subbands */

#define MPA_STEREO  0
#define MPA_JSTEREO 1
#define MPA_DUAL    2
#define MPA_MONO    3

int l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
int mpa_decode_header(AVCodecContext *avctx, uint32_t head);

extern const uint16_t mpa_bitrate_tab[2][3][15];
extern const uint16_t mpa_freq_tab[3];
extern const unsigned char *alloc_tables[5];
extern const double enwindow[512];
extern const int sblimit_table[5];
extern const int quant_steps[17];
extern const int quant_bits[17];
extern const int32_t mpa_enwindow[257];