mpegaudio.h
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:1k
源码类别:
Windows CE
开发平台:
C/C++
- /**
- * @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
- /* header + layer + bitrate + freq + lsf/mpeg25 */
- #define SAME_HEADER_MASK
- (0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
- 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];
- /* fast header check for resync */
- static inline int ff_mpa_check_header(uint32_t header){
- /* header */
- if ((header & 0xffe00000) != 0xffe00000)
- return -1;
- /* layer check */
- if ((header & (3<<17)) == 0)
- return -1;
- /* bit rate */
- if ((header & (0xf<<12)) == 0xf<<12)
- return -1;
- /* frequency */
- if ((header & (3<<10)) == 3<<10)
- return -1;
- return 0;
- }