21
/* header + layer + bitrate + freq + lsf/mpeg25 */
22
#define SAME_HEADER_MASK \
23
(0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
25
/* define USE_HIGHPRECISION to have a bit exact (but slower) mpeg
28
#ifdef USE_HIGHPRECISION
29
#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
30
#define WFRAC_BITS 16 /* fractional bits for window */
32
#define FRAC_BITS 15 /* fractional bits for sb_samples and dct */
33
#define WFRAC_BITS 14 /* fractional bits for window */
36
#if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
37
typedef int32_t OUT_INT;
38
#define OUT_MAX INT32_MAX
39
#define OUT_MIN INT32_MIN
40
#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 31)
42
typedef int16_t OUT_INT;
43
#define OUT_MAX INT16_MAX
44
#define OUT_MIN INT16_MIN
45
#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15)
49
typedef int16_t MPA_INT;
51
typedef int32_t MPA_INT;
21
54
int l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
22
55
int mpa_decode_header(AVCodecContext *avctx, uint32_t head);
56
void ff_mpa_synth_init(MPA_INT *window);
57
void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
58
MPA_INT *window, int *dither_state,
59
OUT_INT *samples, int incr,
60
int32_t sb_samples[SBLIMIT]);
24
62
extern const uint16_t mpa_bitrate_tab[2][3][15];
25
63
extern const uint16_t mpa_freq_tab[3];
29
67
extern const int quant_steps[17];
30
68
extern const int quant_bits[17];
31
69
extern const int32_t mpa_enwindow[257];
71
/* fast header check for resync */
72
static inline int ff_mpa_check_header(uint32_t header){
74
if ((header & 0xffe00000) != 0xffe00000)
77
if ((header & (3<<17)) == 0)
80
if ((header & (0xf<<12)) == 0xf<<12)
83
if ((header & (3<<10)) == 3<<10)