35 float **plevel_table, uint16_t **pint_table,
40 const uint32_t *table_codes = vlc_table->
huffcodes;
41 const uint16_t *levels_table = vlc_table->
levels;
42 uint16_t *run_table, *level_table, *int_table;
44 int i, l, j, k,
level;
48 run_table =
av_malloc(n *
sizeof(uint16_t));
49 level_table =
av_malloc(n *
sizeof(uint16_t));
50 flevel_table =
av_malloc(n *
sizeof(*flevel_table));
51 int_table =
av_malloc(n *
sizeof(uint16_t));
52 if (!run_table || !level_table || !flevel_table || !int_table) {
64 l = levels_table[k++];
65 for (j = 0; j < l; j++) {
67 level_table[i] =
level;
68 flevel_table[i] =
level;
73 *prun_table = run_table;
74 *plevel_table = flevel_table;
75 *pint_table = int_table;
85 float bps1, high_freq;
112 nb = ((flags2 >> 3) & 3) + 1;
129 if (sample_rate1 >= 44100)
130 sample_rate1 = 44100;
131 else if (sample_rate1 >= 22050)
132 sample_rate1 = 22050;
133 else if (sample_rate1 >= 16000)
134 sample_rate1 = 16000;
135 else if (sample_rate1 >= 11025)
136 sample_rate1 = 11025;
137 else if (sample_rate1 >= 8000)
150 if (sample_rate1 == 44100) {
154 high_freq = high_freq * 0.4;
155 }
else if (sample_rate1 == 22050) {
158 else if (bps1 >= 0.72)
159 high_freq = high_freq * 0.7;
161 high_freq = high_freq * 0.6;
162 }
else if (sample_rate1 == 16000) {
164 high_freq = high_freq * 0.5;
166 high_freq = high_freq * 0.3;
167 }
else if (sample_rate1 == 11025)
168 high_freq = high_freq * 0.7;
169 else if (sample_rate1 == 8000) {
171 high_freq = high_freq * 0.5;
175 high_freq = high_freq * 0.65;
178 high_freq = high_freq * 0.75;
180 high_freq = high_freq * 0.6;
182 high_freq = high_freq * 0.5;
185 ff_dlog(s->
avctx,
"version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
188 ff_dlog(s->
avctx,
"bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
190 ff_dlog(s->
avctx,
"use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
195 int a,
b, pos, lpos, k, block_len, i, j, n;
207 for (i = 0; i < 25; i++) {
210 pos = ((block_len * 2 *
a) + (b >> 1)) / b;
214 if (pos >= block_len) {
235 for (i = 0; i < n; i++)
241 for (i = 0; i < 25; i++) {
244 pos = ((block_len * 2 *
a) + (b << 1)) / (4 * b);
250 if (pos >= block_len)
266 for (i = 0; i < n; i++) {
271 if (start < s->high_band_start[k])
319 norm = (1.0 / (
float) (1LL << 31)) * sqrt(3) * s->
noise_mult;
330 if (avctx->sample_rate >= 32000) {
333 else if (bps1 < 1.16)
336 s->coef_vlcs[0] = &
coef_vlcs[coef_vlc_table * 2];
337 s->coef_vlcs[1] = &
coef_vlcs[coef_vlc_table * 2 + 1];
338 ret =
init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0],
339 &s->int_table[0], s->coef_vlcs[0]);
343 return init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1],
344 &s->int_table[1], s->coef_vlcs[1]);
351 else if (total_gain < 32)
353 else if (total_gain < 40)
355 else if (total_gain < 45)
373 for (i = 0; i < 2; i++) {
421 VLC *vlc,
const float *level_table,
422 const uint16_t *run_table,
int version,
423 WMACoef *ptr,
int offset,
int num_coefs,
424 int block_len,
int frame_len_bits,
427 int code,
level, sign;
428 const uint32_t *ilvl = (
const uint32_t *) level_table;
429 uint32_t *iptr = (uint32_t *) ptr;
430 const unsigned int coef_mask = block_len - 1;
431 for (; offset < num_coefs; offset++) {
435 offset += run_table[code];
437 iptr[offset & coef_mask] = ilvl[code] ^ sign << 31;
438 }
else if (code == 1) {
447 offset +=
get_bits(gb, frame_len_bits);
455 "broken escape sequence\n");
458 offset +=
get_bits(gb, frame_len_bits) + 4;
464 ptr[offset & coef_mask] = (level ^ sign) - sign;
468 if (offset > num_coefs) {
const struct AVCodec * codec
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
int next_block_len_bits
log2 of next block length
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb, VLC *vlc, const float *level_table, const uint16_t *run_table, int version, WMACoef *ptr, int offset, int num_coefs, int block_len, int frame_len_bits, int coef_nb_bits)
Decode run level compressed coefficients.
const uint16_t ff_wma_critical_freqs[25]
const uint8_t * huffbits
VLC bit size.
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
int n
total number of codes
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Macro definitions for various function/variable attributes.
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
int high_band_start[BLOCK_NB_SIZES]
index of first coef in high band
int exponent_sizes[BLOCK_NB_SIZES]
float WMACoef
type for decoded coefficients, int16_t would be enough for wma 1/2
const uint32_t * huffcodes
VLC bit values.
int nb_block_sizes
number of block sizes
int ff_wma_total_gain_to_bits(int total_gain)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
uint16_t exponent_bands[BLOCK_NB_SIZES][25]
int flags
AV_CODEC_FLAG_*.
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]
int ff_wma_end(AVCodecContext *avctx)
int bit_rate
the average bitrate
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
float * windows[BLOCK_NB_SIZES]
static const uint8_t exponent_band_44100[3][25]
av_cold int ff_wma_init(AVCodecContext *avctx, int flags2)
int version
1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
int frame_len
frame length in samples
int frame_len_bits
frame_len = 1 << frame_len_bits
Libavcodec external API header.
int sample_rate
samples per second
int use_exp_vlc
exponent coding: 0 = lsp, 1 = vlc + delta
main external API structure.
int exponent_high_sizes[BLOCK_NB_SIZES]
static unsigned int get_bits1(GetBitContext *s)
int use_noise_coding
true if perceptual noise is added
SINETABLE_CONST float *const ff_sine_windows[14]
int use_variable_block_len
FFTContext mdct_ctx[BLOCK_NB_SIZES]
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
av_cold int ff_wma_get_frame_len_bits(int sample_rate, int version, unsigned int decode_flags)
Get the samples per frame for this stream.
av_cold void avpriv_float_dsp_init(AVFloatDSPContext *fdsp, int bit_exact)
Initialize a float DSP context.
int prev_block_len_bits
log2 of prev block length
int coefs_end[BLOCK_NB_SIZES]
max number of coded coefficients
common internal api header.
int channels
number of audio channels
VLC_TYPE(* table)[2]
code, bits
static av_cold int init_coef_vlc(VLC *vlc, uint16_t **prun_table, float **plevel_table, uint16_t **pint_table, const CoefVLCTable *vlc_table)
unsigned int ff_wma_get_large_val(GetBitContext *gb)
Decode an uncompressed coefficient.
static const CoefVLCTable coef_vlcs[6]
int coefs_start
first coded coef
int block_len_bits
log2 of current block length
static const uint8_t exponent_band_22050[3][25]
static const uint8_t exponent_band_32000[3][25]
void ff_free_vlc(VLC *vlc)
void ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows
float noise_table[NOISE_TAB_SIZE]
const uint16_t * levels
table to build run/level tables