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| author | Roberto Togni <r_togni@tiscali.it> | 2005-10-18 20:16:43 +0000 |
|---|---|---|
| committer | Roberto Togni <r_togni@tiscali.it> | 2005-10-18 20:16:43 +0000 |
| commit | d9b1c197e5f99655328b713b7100e3125139546a (patch) | |
| tree | 341d43d7b40c5533c6f35db90c13050a2ff8200b /libavcodec/mpegaudio.h | |
| parent | ea7e68b1e2e3983198cac5814720d6f7655299bc (diff) | |
| download | ffmpeg-d9b1c197e5f99655328b713b7100e3125139546a.tar.gz | |
QDM2 compatible decoder
Originally committed as revision 4649 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpegaudio.h')
| -rw-r--r-- | libavcodec/mpegaudio.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/libavcodec/mpegaudio.h b/libavcodec/mpegaudio.h index 072c41bda7..2bcf38eac2 100644 --- a/libavcodec/mpegaudio.h +++ b/libavcodec/mpegaudio.h @@ -22,8 +22,42 @@ #define SAME_HEADER_MASK \ (0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19)) +/* define USE_HIGHPRECISION to have a bit exact (but slower) mpeg + audio decoder */ + +#ifdef USE_HIGHPRECISION +#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */ +#define WFRAC_BITS 16 /* fractional bits for window */ +#else +#define FRAC_BITS 15 /* fractional bits for sb_samples and dct */ +#define WFRAC_BITS 14 /* fractional bits for window */ +#endif + +#if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT) +typedef int32_t OUT_INT; +#define OUT_MAX INT32_MAX +#define OUT_MIN INT32_MIN +#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 31) +#else +typedef int16_t OUT_INT; +#define OUT_MAX INT16_MAX +#define OUT_MIN INT16_MIN +#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15) +#endif + +#if FRAC_BITS <= 15 +typedef int16_t MPA_INT; +#else +typedef int32_t MPA_INT; +#endif + int l2_select_table(int bitrate, int nb_channels, int freq, int lsf); int mpa_decode_header(AVCodecContext *avctx, uint32_t head); +void ff_mpa_synth_init(MPA_INT *window); +void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset, + MPA_INT *window, int *dither_state, + OUT_INT *samples, int incr, + int32_t sb_samples[SBLIMIT]); extern const uint16_t mpa_bitrate_tab[2][3][15]; extern const uint16_t mpa_freq_tab[3]; |