Author: faust3
Date: Sun Feb 8 22:30:45 2009
New Revision: 4032
Log:
documented a few more struct members
Modified:
wmapro/wma3.h
Modified: wmapro/wma3.h
==============================================================================
--- wmapro/wma3.h Sun Feb 8 22:12:08 2009 (r4031)
+++ wmapro/wma3.h Sun Feb 8 22:30:45 2009 (r4032)
@@ -55,14 +55,14 @@ typedef struct {
uint16_t channel_len; //< channel length in
samples
uint16_t decoded_samples; //< already processed
samples
uint8_t grouped; //< channel is part of a
group
- int quant_step_modifier;
+ int quant_step_modifier; //< deviation from the
main quantization step
int transmit_sf; //< transmit scale
factors
- int reuse_sf; //< share sfs between
subframes
+ int reuse_sf; //< share scale factors
between subframes
int scale_factor_step; //< scaling step
int max_scale_factor; //< maximum scale factor
int scale_factors[MAX_BANDS]; //< scale factor values
int resampled_scale_factors[MAX_BANDS]; //< scale factors from a
previous block
- int scale_factor_block_len; //< sf reference block
length
+ int scale_factor_block_len; //< scale factor
reference block length
float* coeffs; //< pointer to the
decode buffer
DECLARE_ALIGNED_16(float, out[2*BLOCK_MAX_SIZE]); //< output buffer
} WMA3ChannelCtx;
@@ -87,11 +87,11 @@ typedef struct {
typedef struct WMA3DecodeContext {
/** generic decoder variables */
AVCodecContext* avctx; //< codec context for
av_log
- DSPContext dsp;
+ DSPContext dsp; //< accelerated dsp
functions
MDCTContext mdct_ctx[BLOCK_NB_SIZES]; //< MDCT context per block
size
- DECLARE_ALIGNED_16(float, tmp[BLOCK_MAX_SIZE]); //< imdct working buffer
+ DECLARE_ALIGNED_16(float, tmp[BLOCK_MAX_SIZE]); //< imdct output buffer
float* windows[BLOCK_NB_SIZES]; //< window per block size
- VLC sf_vlc; //< scale factor DPCM vlc
+ VLC sf_vlc; //< scale factor dpcm vlc
VLC sf_rl_vlc; //< scale factor run
length vlc
VLC vec4_vlc; //< 4 coefficients per
symbol
VLC vec2_vlc; //< 2 coefficients per
symbol
@@ -124,13 +124,13 @@ typedef struct WMA3DecodeContext {
int prev_packet_bit_size; //< saved number of bits
uint8_t* prev_packet_data; //< prev frame data
uint8_t bit5; //< padding bit? (CBR
files)
- uint8_t bit6;
+ uint8_t bit6; //< unknown
uint8_t packet_loss; //< set in case of
bitstream error
uint8_t negative_quantstep; //< packet loss due to
negative quant step
/** frame decode state */
unsigned int frame_num; //< current frame number
- GetBitContext* getbit;
+ GetBitContext* getbit; //< bitstream reader
context
int buf_bit_size; //< buffer size in bits
int16_t* samples; //< current samplebuffer
pointer
int16_t* samples_end; //< maximum samplebuffer
pointer
@@ -141,13 +141,13 @@ typedef struct WMA3DecodeContext {
/** subframe/block decode state */
int subframe_len; //< current subframe length
- int channels_for_cur_subframe;
+ int channels_for_cur_subframe; //< number of channels
that contain the subframe
int channel_indexes_for_cur_subframe[MAX_CHANNELS];
int cur_subwoofer_cutoff; //< subwoofer cutoff value
int num_bands; //< number of scale factor
bands
int* cur_sfb_offsets; //< sfb offsets for the
current block
- int quant_step;
- int esc_len;
+ int quant_step; //< quantization step
+ int esc_len; //< length of escaped
coefficients
uint8_t num_chgroups; //< number of channel
groups
WMA3ChannelGroup chgroup[MAX_CHANNELS]; //< channel group
information
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