wmavoice.c File Reference

Windows Media Audio Voice compatible decoder. More...

#include <math.h>
#include "libavutil/channel_layout.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "put_bits.h"
#include "wmavoice_data.h"
#include "celp_filters.h"
#include "acelp_vectors.h"
#include "acelp_filters.h"
#include "lsp.h"
#include "dct.h"
#include "rdft.h"
#include "sinewin.h"

Classes
struct	frame_type_desc
	Description of frame types.
struct	WMAVoiceContext
	WMA Voice decoding context. More...

Macros
#define	MAX_BLOCKS   8
	maximum number of blocks per frame
#define	MAX_LSPS   16
	maximum filter order
#define	MAX_LSPS_ALIGN16   16
	same as MAX_LSPS; needs to be multiple More...
#define	MAX_FRAMES   3
	maximum number of frames per superframe
#define	MAX_FRAMESIZE   160
	maximum number of samples per frame
#define	MAX_SIGNAL_HISTORY   416
	maximum excitation signal history
#define	MAX_SFRAMESIZE   (MAX_FRAMESIZE * MAX_FRAMES)
	maximum number of samples per superframe
#define	SFRAME_CACHE_MAXSIZE   256
	maximum cache size for frame data that More...
#define	VLC_NBITS   6
	number of bits to read per VLC iteration
#define	log_range(var, assign)

Typedefs
typedef struct WMAVoiceContext	WMAVoiceContext
	WMA Voice decoding context.

Enumerations
enum	{ ACB_TYPE_NONE = 0, ACB_TYPE_ASYMMETRIC = 1, ACB_TYPE_HAMMING = 2 }
	Adaptive codebook types. More...
enum	{ FCB_TYPE_SILENCE = 0, FCB_TYPE_HARDCODED = 1, FCB_TYPE_AW_PULSES = 2, FCB_TYPE_EXC_PULSES = 3 }
	Fixed codebook types. More...

Variables
AVCodec	ff_wmavoice_decoder

Detailed Description

Windows Media Audio Voice compatible decoder.

Author

Ronald S. Bultje rsbul.nosp@m.tje@.nosp@m.gmail.nosp@m..com

Macro Definition Documentation

log_range

#define log_range	(		var,
			assign
	)

Value:

do { \
        float tmp = log10f(assign);  var = tmp; \
        max       = FFMAX(max, tmp); min = FFMIN(min, tmp); \
    } while (0)

MAX_LSPS_ALIGN16

#define MAX_LSPS_ALIGN16   16

same as MAX_LSPS; needs to be multiple

of 16 for ASM input buffer alignment

SFRAME_CACHE_MAXSIZE

#define SFRAME_CACHE_MAXSIZE   256

maximum cache size for frame data that

was split over two packets

Enumeration Type Documentation

anonymous enum

anonymous enum

Adaptive codebook types.

Enumerator
ACB_TYPE_NONE	no adaptive codebook (only hardcoded fixed)
ACB_TYPE_ASYMMETRIC	adaptive codebook with per-frame pitch, which we interpolate to get a per-sample pitch. Signal is generated using an asymmetric sinc window function Note see #wmavoice_ipol1_coeffs
ACB_TYPE_HAMMING	Per-block pitch with signal generation using a Hamming sinc window function. Note see #wmavoice_ipol2_coeffs

anonymous enum

anonymous enum

Fixed codebook types.

Enumerator
FCB_TYPE_SILENCE	comfort noise during silence generated from a hardcoded (fixed) codebook with per-frame (low) gain values
FCB_TYPE_HARDCODED	hardcoded (fixed) codebook with per-block gain values
FCB_TYPE_AW_PULSES	Pitch-adaptive window (AW) pulse signals, used in particular for low-bitrate streams.
FCB_TYPE_EXC_PULSES	Innovation (fixed) codebook pulse sets in combinations of either single pulses or pulse pairs.

Variable Documentation

ff_wmavoice_decoder

AVCodec ff_wmavoice_decoder

Initial value:

= {
    .name             = "wmavoice",
    .long_name        = NULL_IF_CONFIG_SMALL("Windows Media Audio Voice"),
    .type             = AVMEDIA_TYPE_AUDIO,
    .id               = AV_CODEC_ID_WMAVOICE,
    .priv_data_size   = sizeof(WMAVoiceContext),
    .init             = wmavoice_decode_init,
    .close            = wmavoice_decode_end,
    .decode           = wmavoice_decode_packet,
    .capabilities     = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
    .flush            = wmavoice_flush,
}