Libav
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#include <inttypes.h>
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "put_bits.h"
#include "wma.h"
#include "wma_common.h"
Go to the source code of this file.
Data Structures | |
struct | WmallChannelCtx |
frame-specific decoder context for a single channel More... | |
struct | WmallDecodeCtx |
main decoder context More... | |
Macros | |
#define | WMALL_MAX_CHANNELS 8 |
current decoder limitations More... | |
#define | MAX_SUBFRAMES 32 |
max number of subframes per channel More... | |
#define | MAX_BANDS 29 |
max number of scale factor bands More... | |
#define | MAX_FRAMESIZE 32768 |
maximum compressed frame size More... | |
#define | MAX_ORDER 256 |
#define | WMALL_BLOCK_MIN_BITS 6 |
log2 of min block size More... | |
#define | WMALL_BLOCK_MAX_BITS 14 |
log2 of max block size More... | |
#define | WMALL_BLOCK_MAX_SIZE (1 << WMALL_BLOCK_MAX_BITS) |
maximum block size More... | |
#define | WMALL_BLOCK_SIZES (WMALL_BLOCK_MAX_BITS - WMALL_BLOCK_MIN_BITS + 1) |
possible block sizes More... | |
Functions | |
static av_cold int | decode_init (AVCodecContext *avctx) |
static int | decode_subframe_length (WmallDecodeCtx *s, int offset) |
Decode the subframe length. More... | |
static int | decode_tilehdr (WmallDecodeCtx *s) |
Decode how the data in the frame is split into subframes. More... | |
static void | decode_ac_filter (WmallDecodeCtx *s) |
static void | decode_mclms (WmallDecodeCtx *s) |
static int | decode_cdlms (WmallDecodeCtx *s) |
static int | decode_channel_residues (WmallDecodeCtx *s, int ch, int tile_size) |
static void | decode_lpc (WmallDecodeCtx *s) |
static void | clear_codec_buffers (WmallDecodeCtx *s) |
static void | reset_codec (WmallDecodeCtx *s) |
Reset filter parameters and transient area at new seekable tile. More... | |
static void | mclms_update (WmallDecodeCtx *s, int icoef, int *pred) |
static void | mclms_predict (WmallDecodeCtx *s, int icoef, int *pred) |
static void | revert_mclms (WmallDecodeCtx *s, int tile_size) |
static int | lms_predict (WmallDecodeCtx *s, int ich, int ilms) |
static void | lms_update (WmallDecodeCtx *s, int ich, int ilms, int input, int residue) |
static void | use_high_update_speed (WmallDecodeCtx *s, int ich) |
static void | use_normal_update_speed (WmallDecodeCtx *s, int ich) |
static void | revert_cdlms (WmallDecodeCtx *s, int ch, int coef_begin, int coef_end) |
static void | revert_inter_ch_decorr (WmallDecodeCtx *s, int tile_size) |
static void | revert_acfilter (WmallDecodeCtx *s, int tile_size) |
static int | decode_subframe (WmallDecodeCtx *s) |
static int | decode_frame (WmallDecodeCtx *s) |
Decode one WMA frame. More... | |
static int | remaining_bits (WmallDecodeCtx *s, GetBitContext *gb) |
Calculate remaining input buffer length. More... | |
static void | save_bits (WmallDecodeCtx *s, GetBitContext *gb, int len, int append) |
Fill the bit reservoir with a (partial) frame. More... | |
static int | decode_packet (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) |
static void | flush (AVCodecContext *avctx) |
static av_cold int | decode_close (AVCodecContext *avctx) |
Variables | |
AVCodec | ff_wmalossless_decoder |
#define WMALL_MAX_CHANNELS 8 |
current decoder limitations
max number of handled channels
Definition at line 38 of file wmalosslessdec.c.
Referenced by decode_init(), decode_tilehdr(), and revert_mclms().
#define MAX_SUBFRAMES 32 |
max number of subframes per channel
Definition at line 39 of file wmalosslessdec.c.
Referenced by decode_init(), and decode_tilehdr().
#define MAX_BANDS 29 |
max number of scale factor bands
Definition at line 40 of file wmalosslessdec.c.
#define MAX_FRAMESIZE 32768 |
maximum compressed frame size
Definition at line 41 of file wmalosslessdec.c.
Referenced by decode_init(), decode_packet(), flush(), and save_bits().
#define MAX_ORDER 256 |
Definition at line 42 of file wmalosslessdec.c.
Referenced by decode_cdlms().
#define WMALL_BLOCK_MIN_BITS 6 |
log2 of min block size
Definition at line 44 of file wmalosslessdec.c.
#define WMALL_BLOCK_MAX_BITS 14 |
log2 of max block size
Definition at line 45 of file wmalosslessdec.c.
#define WMALL_BLOCK_MAX_SIZE (1 << WMALL_BLOCK_MAX_BITS) |
#define WMALL_BLOCK_SIZES (WMALL_BLOCK_MAX_BITS - WMALL_BLOCK_MIN_BITS + 1) |
possible block sizes
Definition at line 47 of file wmalosslessdec.c.
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Definition at line 176 of file wmalosslessdec.c.
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Decode the subframe length.
s | context |
offset | sample offset in the frame |
Definition at line 280 of file wmalosslessdec.c.
Referenced by decode_tilehdr().
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Decode how the data in the frame is split into subframes.
Every WMA frame contains the encoded data for a fixed number of samples per channel. The data for every channel might be split into several subframes. This function will reconstruct the list of subframes for every channel.
If the subframes are not evenly split, the algorithm estimates the channels with the lowest number of total samples. Afterwards, for each of these channels a bit is read from the bitstream that indicates if the channel contains a subframe with the next subframe size that is going to be read from the bitstream or not. If a channel contains such a subframe, the subframe size gets added to the channel's subframe list. The algorithm repeats these steps until the frame is properly divided between the individual channels.
s | context |
Definition at line 322 of file wmalosslessdec.c.
Referenced by decode_frame().
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Definition at line 407 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 418 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 441 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 487 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 546 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 558 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Reset filter parameters and transient area at new seekable tile.
Definition at line 587 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 602 of file wmalosslessdec.c.
Referenced by revert_mclms().
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Definition at line 660 of file wmalosslessdec.c.
Referenced by revert_mclms().
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Definition at line 682 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 691 of file wmalosslessdec.c.
Referenced by revert_cdlms().
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Definition at line 703 of file wmalosslessdec.c.
Referenced by revert_cdlms().
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Definition at line 745 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 763 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 780 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 798 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 811 of file wmalosslessdec.c.
Referenced by decode_subframe().
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Definition at line 843 of file wmalosslessdec.c.
Referenced by decode_frame().
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Decode one WMA frame.
s | codec context |
Definition at line 1017 of file wmalosslessdec.c.
Referenced by decode_packet().
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Calculate remaining input buffer length.
s | codec context |
gb | bitstream reader context |
Definition at line 1115 of file wmalosslessdec.c.
Referenced by decode_packet().
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Fill the bit reservoir with a (partial) frame.
s | codec context |
gb | bitstream reader context |
len | length of the partial frame |
append | decides whether to reset the buffer or not |
Definition at line 1127 of file wmalosslessdec.c.
Referenced by decode_packet().
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Definition at line 1171 of file wmalosslessdec.c.
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Definition at line 1282 of file wmalosslessdec.c.
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Definition at line 1295 of file wmalosslessdec.c.
AVCodec ff_wmalossless_decoder |
Definition at line 1304 of file wmalosslessdec.c.