FFmpeg: libavcodec/mpc.h Source File

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libavcodec

mpc.h

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1 /*

2 * Musepack decoder

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 /**

23 * @file

24 * Musepack decoder

25 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples

26 * divided into 32 subbands.

27 */

29 #ifndef AVCODEC_MPC_H

30 #define AVCODEC_MPC_H

32 #include "libavutil/lfg.h"

33 #include "avcodec.h"

34 #include "get_bits.h"

35 #include "dsputil.h"

36 #include "mpegaudio.h"

37 #include "mpegaudiodsp.h"

39 #define BANDS 32

40 #define SAMPLES_PER_BAND 36

41 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)

43 /** Subband structure - hold all variables for each subband */

44 typedef struct Band {

45 int msf; ///< mid-stereo flag

46 int res[2];

47 int scfi[2];

48 int scf_idx[2][3];

49 int Q[2];

50 }Band;

52 typedef struct MPCContext {

53 DSPContext dsp;

54 MPADSPContext mpadsp;

55 GetBitContext gb;

56 int IS, MSS, gapless;

57 int lastframelen;

58 int maxbands, last_max_band;

59 int last_bits_used;

60 int oldDSCF[2][BANDS];

61 Band bands[BANDS];

62 int Q[2][MPC_FRAME_SIZE];

63 int cur_frame, frames;

64 uint8_t *bits;

65 int buf_size;

66 AVLFG rnd;

67 int frames_to_skip;

68 /* for synthesis */

69 DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2];

70 int synth_buf_offset[MPA_MAX_CHANNELS];

71 DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];

72 } MPCContext;

74 void ff_mpc_init(void);

75 void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels);

77 #endif /* AVCODEC_MPC_H */

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