2 * WMA compatible decoder
4 * Extracted 2009 from the mplayer source code 2009-02-10.
6 * Copyright (c) 2002 The FFmpeg Project
8 * Licensed under the GNU Lesser General Public License.
9 * For licencing details see COPYING.LIB.
12 /** \file wmadec_filter.c paraslash's WMA decoder. */
15 * This decoder handles Microsoft Windows Media Audio data version 2.
18 #define _XOPEN_SOURCE 600
22 #include <sys/select.h>
29 #include "buffer_tree.h"
31 #include "portable_io.h"
32 #include "bitstream.h"
39 #define BLOCK_MIN_BITS 7
40 #define BLOCK_MAX_BITS 11
41 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
43 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
45 /* XXX: find exact max size */
46 #define HIGH_BAND_MAX_SIZE 16
48 /* XXX: is it a suitable value ? */
49 #define MAX_CODED_SUPERFRAME_SIZE 16384
51 #define MAX_CHANNELS 2
53 #define NOISE_TAB_SIZE 8192
55 #define LSP_POW_BITS 7
57 struct private_wmadec_data {
58 /** Information contained in the audio file header. */
59 struct asf_header_info ahi;
60 struct getbit_context gb;
61 /** Whether perceptual noise is added. */
63 /** Depends on number of the bits per second and the frame length. */
65 /** Only used if ahi->use_exp_vlc is true. */
67 uint16_t exponent_bands[BLOCK_NB_SIZES][25];
68 /** The index of the first coef in high band. */
69 int high_band_start[BLOCK_NB_SIZES];
70 /** Maximal number of coded coefficients. */
71 int coefs_end[BLOCK_NB_SIZES];
72 int exponent_high_sizes[BLOCK_NB_SIZES];
73 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
76 /* coded values in high bands */
77 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
78 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
80 /* there are two possible tables for spectral coefficients */
81 struct vlc coef_vlc[2];
82 uint16_t *run_table[2];
83 uint16_t *level_table[2];
84 /** Frame length in samples. */
86 /** log2 of frame_len. */
88 /** Number of block sizes, one if !ahi->use_variable_block_len. */
90 /* Whether to update block lengths from getbit context. */
91 bool reset_block_lengths;
92 /** log2 of current block length. */
94 /** log2 of next block length. */
95 int next_block_len_bits;
96 /** log2 of previous block length. */
97 int prev_block_len_bits;
98 /** Block length in samples. */
100 /** Current position in frame. */
102 /** True if mid/side stereo mode. */
104 /** True if channel is coded. */
105 uint8_t channel_coded[MAX_CHANNELS];
106 /** log2 ratio frame/exp. length. */
107 int exponents_bsize[MAX_CHANNELS];
109 float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
110 float max_exponent[MAX_CHANNELS];
111 int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
112 float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE];
113 float output[BLOCK_MAX_SIZE * 2];
114 struct mdct_context *mdct_ctx[BLOCK_NB_SIZES];
115 float *windows[BLOCK_NB_SIZES];
116 /** Output buffer for one frame and the last for IMDCT windowing. */
117 float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
118 /** Last frame info. */
119 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
121 int last_superframe_len;
122 float noise_table[NOISE_TAB_SIZE];
124 float noise_mult; /* XXX: suppress that and integrate it in the noise array */
125 /* lsp_to_curve tables */
126 float lsp_cos_table[BLOCK_MAX_SIZE];
127 float lsp_pow_e_table[256];
128 float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
129 float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
133 #define HGAINVLCBITS 9
136 /** \cond sine_winows */
138 #define SINE_WINDOW(x) static float sine_ ## x[x] __a_aligned(16)
147 static float *sine_windows[6] = {
148 sine_128, sine_256, sine_512, sine_1024, sine_2048, sine_4096
150 /** \endcond sine_windows */
152 /* Generate a sine window. */
153 static void sine_window_init(float *window, int n)
157 for (i = 0; i < n; i++)
158 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
161 static void init_coef_vlc(struct private_wmadec_data *pwd, int sidx, int didx)
163 const struct coef_vlc_table *src = coef_vlcs + sidx;
164 struct vlc *dst = pwd->coef_vlc + didx;
165 int i, l, j, k, level, n = src->n;
167 init_vlc(dst, VLCBITS, n, src->huffbits, src->huffcodes, 4);
168 pwd->run_table[didx] = para_malloc(n * sizeof(uint16_t));
169 pwd->level_table[didx] = para_malloc(n * sizeof(uint16_t));
174 l = src->levels[k++];
175 for (j = 0; j < l; j++) {
176 pwd->run_table[didx][i] = j;
177 pwd->level_table[didx][i] = level;
184 /* compute the scale factor band sizes for each MDCT block size */
185 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
188 struct asf_header_info *ahi = &pwd->ahi;
189 int a, b, pos, lpos, k, block_len, i, j, n;
190 const uint8_t *table;
192 for (k = 0; k < pwd->nb_block_sizes; k++) {
195 block_len = pwd->frame_len >> k;
197 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
199 if (ahi->sample_rate >= 44100)
200 table = exponent_band_44100[a];
201 else if (ahi->sample_rate >= 32000)
202 table = exponent_band_32000[a];
203 else if (ahi->sample_rate >= 22050)
204 table = exponent_band_22050[a];
208 for (i = 0; i < n; i++)
209 pwd->exponent_bands[k][i] = table[i];
214 for (i = 0; i < 25; i++) {
215 a = wma_critical_freqs[i];
216 b = ahi->sample_rate;
217 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
222 pwd->exponent_bands[k][j++] = pos - lpos;
223 if (pos >= block_len)
230 /* max number of coefs */
231 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
232 /* high freq computation */
233 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
234 / ahi->sample_rate + 0.5);
238 for (i = 0; i < n; i++) {
241 pos += pwd->exponent_bands[k][i];
243 if (start < pwd->high_band_start[k])
244 start = pwd->high_band_start[k];
245 if (end > pwd->coefs_end[k])
246 end = pwd->coefs_end[k];
248 pwd->exponent_high_bands[k][j++] = end - start;
250 pwd->exponent_high_sizes[k] = j;
254 static int wma_init(struct private_wmadec_data *pwd)
257 float bps1, high_freq;
261 struct asf_header_info *ahi = &pwd->ahi;
262 int flags2 = ahi->flags2;
264 if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
265 || ahi->channels <= 0 || ahi->channels > 8
266 || ahi->bit_rate <= 0)
267 return -E_WMA_BAD_PARAMS;
269 /* compute MDCT block size */
270 if (ahi->sample_rate <= 16000)
271 pwd->frame_len_bits = 9;
272 else if (ahi->sample_rate <= 22050)
273 pwd->frame_len_bits = 10;
275 pwd->frame_len_bits = 11;
276 pwd->frame_len = 1 << pwd->frame_len_bits;
277 if (pwd->ahi.use_variable_block_len) {
279 nb = ((flags2 >> 3) & 3) + 1;
280 if ((ahi->bit_rate / ahi->channels) >= 32000)
282 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
285 pwd->nb_block_sizes = nb + 1;
287 pwd->nb_block_sizes = 1;
289 /* init rate dependent parameters */
290 pwd->use_noise_coding = 1;
291 high_freq = ahi->sample_rate * 0.5;
293 /* wma2 rates are normalized */
294 sample_rate1 = ahi->sample_rate;
295 if (sample_rate1 >= 44100)
296 sample_rate1 = 44100;
297 else if (sample_rate1 >= 22050)
298 sample_rate1 = 22050;
299 else if (sample_rate1 >= 16000)
300 sample_rate1 = 16000;
301 else if (sample_rate1 >= 11025)
302 sample_rate1 = 11025;
303 else if (sample_rate1 >= 8000)
306 bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
307 pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
309 * Compute high frequency value and choose if noise coding should be
313 if (ahi->channels == 2)
315 if (sample_rate1 == 44100) {
317 pwd->use_noise_coding = 0;
319 high_freq = high_freq * 0.4;
320 } else if (sample_rate1 == 22050) {
322 pwd->use_noise_coding = 0;
323 else if (bps1 >= 0.72)
324 high_freq = high_freq * 0.7;
326 high_freq = high_freq * 0.6;
327 } else if (sample_rate1 == 16000) {
329 high_freq = high_freq * 0.5;
331 high_freq = high_freq * 0.3;
332 } else if (sample_rate1 == 11025)
333 high_freq = high_freq * 0.7;
334 else if (sample_rate1 == 8000) {
336 high_freq = high_freq * 0.5;
338 pwd->use_noise_coding = 0;
340 high_freq = high_freq * 0.65;
343 high_freq = high_freq * 0.75;
345 high_freq = high_freq * 0.6;
347 high_freq = high_freq * 0.5;
349 PARA_INFO_LOG("channels=%u sample_rate=%u "
350 "bitrate=%u block_align=%d\n",
351 ahi->channels, ahi->sample_rate,
352 ahi->bit_rate, ahi->block_align);
353 PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
354 "high_freq=%f bitoffset=%d\n",
355 pwd->frame_len, bps, bps1,
356 high_freq, pwd->byte_offset_bits);
357 PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
358 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
360 compute_scale_factor_band_sizes(pwd, high_freq);
361 /* init MDCT windows : simple sinus window */
362 for (i = 0; i < pwd->nb_block_sizes; i++) {
364 n = 1 << (pwd->frame_len_bits - i);
365 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
366 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
369 pwd->reset_block_lengths = true;
371 if (pwd->use_noise_coding) {
372 /* init the noise generator */
373 if (pwd->ahi.use_exp_vlc)
374 pwd->noise_mult = 0.02;
376 pwd->noise_mult = 0.04;
382 norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
383 for (i = 0; i < NOISE_TAB_SIZE; i++) {
384 seed = seed * 314159 + 1;
385 pwd->noise_table[i] = (float) ((int) seed) * norm;
390 /* choose the VLC tables for the coefficients */
392 if (ahi->sample_rate >= 32000) {
395 else if (bps1 < 1.16)
398 init_coef_vlc(pwd, coef_vlc_table, 0);
399 init_coef_vlc(pwd, coef_vlc_table + 1, 1);
403 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
408 wdel = M_PI / pwd->frame_len;
409 for (i = 0; i < pwd->frame_len; i++)
410 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
412 /* tables for x^-0.25 computation */
413 for (i = 0; i < 256; i++) {
415 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
418 /* These two tables are needed to avoid two operations in pow_m1_4. */
420 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
421 m = (1 << LSP_POW_BITS) + i;
422 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
424 pwd->lsp_pow_m_table1[i] = 2 * a - b;
425 pwd->lsp_pow_m_table2[i] = b - a;
430 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
432 struct private_wmadec_data *pwd;
435 PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
436 pwd = para_calloc(sizeof(*pwd));
437 ret = read_asf_header(initial_buf, len, &pwd->ahi);
447 for (i = 0; i < pwd->nb_block_sizes; i++) {
448 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
452 if (pwd->use_noise_coding) {
453 PARA_INFO_LOG("using noise coding\n");
454 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
455 sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
456 wma_hgain_huffcodes, 2);
459 if (pwd->ahi.use_exp_vlc) {
460 PARA_INFO_LOG("using exp_vlc\n");
461 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
462 wma_scale_huffbits, wma_scale_huffcodes, 4);
464 PARA_INFO_LOG("using curve\n");
465 wma_lsp_to_curve_init(pwd);
468 return pwd->ahi.header_len;
472 * compute x^-0.25 with an exponent and mantissa table. We use linear
473 * interpolation to reduce the mantissa table size at a small speed
474 * expense (linear interpolation approximately doubles the number of
475 * bits of precision).
477 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
488 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
489 /* build interpolation scale: 1 <= t < 2. */
490 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
491 a = pwd->lsp_pow_m_table1[m];
492 b = pwd->lsp_pow_m_table2[m];
493 return pwd->lsp_pow_e_table[e] * (a + b * t.f);
496 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
497 float *out, float *val_max_ptr, int n, float *lsp)
500 float p, q, w, v, val_max;
503 for (i = 0; i < n; i++) {
506 w = pwd->lsp_cos_table[i];
507 for (j = 1; j < NB_LSP_COEFS; j += 2) {
514 v = pow_m1_4(pwd, v);
519 *val_max_ptr = val_max;
522 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
523 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
525 float lsp_coefs[NB_LSP_COEFS];
528 for (i = 0; i < NB_LSP_COEFS; i++) {
529 if (i == 0 || i >= 8)
530 val = get_bits(&pwd->gb, 3);
532 val = get_bits(&pwd->gb, 4);
533 lsp_coefs[i] = wma_lsp_codebook[i][val];
536 wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
537 pwd->block_len, lsp_coefs);
540 /* Decode exponents coded with VLC codes. */
541 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
543 int last_exp, n, code;
544 const uint16_t *ptr, *band_ptr;
545 float v, *q, max_scale, *q_end;
547 band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
549 q = pwd->exponents[ch];
550 q_end = q + pwd->block_len;
555 code = get_vlc(&pwd->gb, &pwd->exp_vlc);
558 /* NOTE: this offset is the same as MPEG4 AAC ! */
559 last_exp += code - 60;
560 /* XXX: use a table */
561 v = pow(10, last_exp * (1.0 / 16.0));
569 pwd->max_exponent[ch] = max_scale;
573 /* compute src0 * src1 + src2 */
574 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
575 const float *src2, int len)
579 for (i = 0; i < len; i++)
580 dst[i] = src0[i] * src1[i] + src2[i];
583 static inline void vector_mult_reverse(float *dst, const float *src0,
584 const float *src1, int len)
589 for (i = 0; i < len; i++)
590 dst[i] = src0[i] * src1[-i];
594 * Apply MDCT window and add into output.
596 * We ensure that when the windows overlap their squared sum
597 * is always 1 (MDCT reconstruction rule).
599 static void wma_window(struct private_wmadec_data *pwd, float *out)
601 float *in = pwd->output;
602 int block_len, bsize, n;
605 if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
606 block_len = pwd->block_len;
607 bsize = pwd->frame_len_bits - pwd->block_len_bits;
608 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
610 block_len = 1 << pwd->prev_block_len_bits;
611 n = (pwd->block_len - block_len) / 2;
612 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
613 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
615 memcpy(out + n + block_len, in + n + block_len,
618 out += pwd->block_len;
619 in += pwd->block_len;
621 if (pwd->block_len_bits <= pwd->next_block_len_bits) {
622 block_len = pwd->block_len;
623 bsize = pwd->frame_len_bits - pwd->block_len_bits;
624 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
626 block_len = 1 << pwd->next_block_len_bits;
627 n = (pwd->block_len - block_len) / 2;
628 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
629 memcpy(out, in, n * sizeof(float));
630 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
632 memset(out + n + block_len, 0, n * sizeof(float));
636 static int wma_total_gain_to_bits(int total_gain)
640 else if (total_gain < 32)
642 else if (total_gain < 40)
644 else if (total_gain < 45)
650 static int compute_high_band_values(struct private_wmadec_data *pwd,
651 int bsize, int nb_coefs[MAX_CHANNELS])
655 if (!pwd->use_noise_coding)
657 for (ch = 0; ch < pwd->ahi.channels; ch++) {
659 if (!pwd->channel_coded[ch])
661 m = pwd->exponent_high_sizes[bsize];
662 for (i = 0; i < m; i++) {
663 a = get_bit(&pwd->gb);
664 pwd->high_band_coded[ch][i] = a;
667 nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
670 for (ch = 0; ch < pwd->ahi.channels; ch++) {
672 if (!pwd->channel_coded[ch])
674 n = pwd->exponent_high_sizes[bsize];
675 val = (int)0x80000000;
676 for (i = 0; i < n; i++) {
677 if (!pwd->high_band_coded[ch][i])
679 if (val == (int)0x80000000)
680 val = get_bits(&pwd->gb, 7) - 19;
682 int code = get_vlc(&pwd->gb, &pwd->hgain_vlc);
687 pwd->high_band_values[ch][i] = val;
693 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
694 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
697 float mdct_norm = 1.0 / (pwd->block_len / 2);
699 for (ch = 0; ch < pwd->ahi.channels; ch++) {
701 float *coefs, *exponents, mult, mult1, noise;
702 int i, j, n, n1, last_high_band, esize;
703 float exp_power[HIGH_BAND_MAX_SIZE];
705 if (!pwd->channel_coded[ch])
707 coefs1 = pwd->coefs1[ch];
708 exponents = pwd->exponents[ch];
709 esize = pwd->exponents_bsize[ch];
710 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
712 coefs = pwd->coefs[ch];
713 if (!pwd->use_noise_coding) {
714 /* XXX: optimize more */
716 for (i = 0; i < n; i++)
717 *coefs++ = coefs1[i] *
718 exponents[i << bsize >> esize] * mult;
719 n = pwd->block_len - pwd->coefs_end[bsize];
720 for (i = 0; i < n; i++)
724 n1 = pwd->exponent_high_sizes[bsize];
725 /* compute power of high bands */
726 exponents = pwd->exponents[ch] +
727 (pwd->high_band_start[bsize] << bsize);
728 last_high_band = 0; /* avoid warning */
729 for (j = 0; j < n1; j++) {
730 n = pwd->exponent_high_bands[
731 pwd->frame_len_bits - pwd->block_len_bits][j];
732 if (pwd->high_band_coded[ch][j]) {
735 for (i = 0; i < n; i++) {
736 val = exponents[i << bsize >> esize];
739 exp_power[j] = e2 / n;
742 exponents += n << bsize;
744 /* main freqs and high freqs */
745 exponents = pwd->exponents[ch];
746 for (j = -1; j < n1; j++) {
748 n = pwd->high_band_start[bsize];
750 n = pwd->exponent_high_bands[pwd->frame_len_bits
751 - pwd->block_len_bits][j];
752 if (j >= 0 && pwd->high_band_coded[ch][j]) {
753 /* use noise with specified power */
754 mult1 = sqrt(exp_power[j]
755 / exp_power[last_high_band]);
756 /* XXX: use a table */
757 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
758 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
760 for (i = 0; i < n; i++) {
761 noise = pwd->noise_table[pwd->noise_index];
762 pwd->noise_index = (pwd->noise_index + 1)
763 & (NOISE_TAB_SIZE - 1);
764 *coefs++ = noise * exponents[
765 i << bsize >> esize] * mult1;
767 exponents += n << bsize;
769 /* coded values + small noise */
770 for (i = 0; i < n; i++) {
771 noise = pwd->noise_table[pwd->noise_index];
772 pwd->noise_index = (pwd->noise_index + 1)
773 & (NOISE_TAB_SIZE - 1);
774 *coefs++ = ((*coefs1++) + noise) *
775 exponents[i << bsize >> esize]
778 exponents += n << bsize;
781 /* very high freqs: noise */
782 n = pwd->block_len - pwd->coefs_end[bsize];
783 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
784 for (i = 0; i < n; i++) {
785 *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
786 pwd->noise_index = (pwd->noise_index + 1)
787 & (NOISE_TAB_SIZE - 1);
793 * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
796 static int wma_decode_block(struct private_wmadec_data *pwd)
798 int ret, n, v, ch, code, bsize;
799 int coef_nb_bits, total_gain;
800 int nb_coefs[MAX_CHANNELS];
802 /* compute current block length */
803 if (pwd->ahi.use_variable_block_len) {
804 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
806 if (pwd->reset_block_lengths) {
807 pwd->reset_block_lengths = false;
808 v = get_bits(&pwd->gb, n);
809 if (v >= pwd->nb_block_sizes)
810 return -E_WMA_BLOCK_SIZE;
811 pwd->prev_block_len_bits = pwd->frame_len_bits - v;
812 v = get_bits(&pwd->gb, n);
813 if (v >= pwd->nb_block_sizes)
814 return -E_WMA_BLOCK_SIZE;
815 pwd->block_len_bits = pwd->frame_len_bits - v;
817 /* update block lengths */
818 pwd->prev_block_len_bits = pwd->block_len_bits;
819 pwd->block_len_bits = pwd->next_block_len_bits;
821 v = get_bits(&pwd->gb, n);
822 if (v >= pwd->nb_block_sizes)
823 return -E_WMA_BLOCK_SIZE;
824 pwd->next_block_len_bits = pwd->frame_len_bits - v;
826 /* fixed block len */
827 pwd->next_block_len_bits = pwd->frame_len_bits;
828 pwd->prev_block_len_bits = pwd->frame_len_bits;
829 pwd->block_len_bits = pwd->frame_len_bits;
832 /* now check if the block length is coherent with the frame length */
833 pwd->block_len = 1 << pwd->block_len_bits;
834 if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
835 return -E_INCOHERENT_BLOCK_LEN;
837 if (pwd->ahi.channels == 2)
838 pwd->ms_stereo = get_bit(&pwd->gb);
840 for (ch = 0; ch < pwd->ahi.channels; ch++) {
841 int a = get_bit(&pwd->gb);
842 pwd->channel_coded[ch] = a;
846 bsize = pwd->frame_len_bits - pwd->block_len_bits;
848 /* if no channel coded, no need to go further */
849 /* XXX: fix potential framing problems */
854 * Read total gain and extract corresponding number of bits for coef
859 int a = get_bits(&pwd->gb, 7);
865 coef_nb_bits = wma_total_gain_to_bits(total_gain);
867 /* compute number of coefficients */
868 n = pwd->coefs_end[bsize];
869 for (ch = 0; ch < pwd->ahi.channels; ch++)
872 ret = compute_high_band_values(pwd, bsize, nb_coefs);
876 /* exponents can be reused in short blocks. */
877 if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
878 for (ch = 0; ch < pwd->ahi.channels; ch++) {
879 if (pwd->channel_coded[ch]) {
880 if (pwd->ahi.use_exp_vlc) {
881 ret = decode_exp_vlc(pwd, ch);
885 decode_exp_lsp(pwd, ch);
886 pwd->exponents_bsize[ch] = bsize;
891 /* parse spectral coefficients : just RLE encoding */
892 for (ch = 0; ch < pwd->ahi.channels; ch++) {
893 struct vlc *coef_vlc;
894 int level, run, tindex;
896 const uint16_t *level_table, *run_table;
898 if (!pwd->channel_coded[ch])
901 * special VLC tables are used for ms stereo because there is
902 * potentially less energy there
904 tindex = (ch == 1 && pwd->ms_stereo);
905 coef_vlc = &pwd->coef_vlc[tindex];
906 run_table = pwd->run_table[tindex];
907 level_table = pwd->level_table[tindex];
909 ptr = &pwd->coefs1[ch][0];
910 eptr = ptr + nb_coefs[ch];
911 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
913 code = get_vlc(&pwd->gb, coef_vlc);
916 if (code == 1) /* EOB */
918 if (code == 0) { /* escape */
919 level = get_bits(&pwd->gb, coef_nb_bits);
920 /* reading block_len_bits would be better */
921 run = get_bits(&pwd->gb, pwd->frame_len_bits);
922 } else { /* normal code */
923 run = run_table[code];
924 level = level_table[code];
926 if (!get_bit(&pwd->gb))
930 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
934 if (ptr >= eptr) /* EOB can be omitted */
938 compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
939 if (pwd->ms_stereo && pwd->channel_coded[1]) {
943 * Nominal case for ms stereo: we do it before mdct.
945 * No need to optimize this case because it should almost never
948 if (!pwd->channel_coded[0]) {
949 PARA_NOTICE_LOG("rare ms-stereo\n");
950 memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
951 pwd->channel_coded[0] = 1;
953 for (i = 0; i < pwd->block_len; i++) {
954 a = pwd->coefs[0][i];
955 b = pwd->coefs[1][i];
956 pwd->coefs[0][i] = a + b;
957 pwd->coefs[1][i] = a - b;
961 for (ch = 0; ch < pwd->ahi.channels; ch++) {
964 n4 = pwd->block_len / 2;
965 if (pwd->channel_coded[ch])
966 imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
967 else if (!(pwd->ms_stereo && ch == 1))
968 memset(pwd->output, 0, sizeof(pwd->output));
970 /* multiply by the window and add in the frame */
971 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
972 wma_window(pwd, &pwd->frame_out[ch][idx]);
975 /* update block number */
976 pwd->block_pos += pwd->block_len;
977 if (pwd->block_pos >= pwd->frame_len)
984 * Clip a signed integer value into the -32768,32767 range.
986 * \param a The value to clip.
988 * \return The clipped value.
990 static inline int16_t av_clip_int16(int a)
992 if ((a + 32768) & ~65535)
993 return (a >> 31) ^ 32767;
998 /* Decode a frame of frame_len samples. */
999 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
1005 /* read each block */
1008 ret = wma_decode_block(pwd);
1015 /* convert frame to integer */
1016 for (ch = 0; ch < pwd->ahi.channels; ch++) {
1018 iptr = pwd->frame_out[ch];
1020 for (i = 0; i < pwd->frame_len; i++) {
1021 *ptr = av_clip_int16(lrintf(*iptr++));
1022 ptr += pwd->ahi.channels;
1024 /* prepare for next block */
1025 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1026 pwd->frame_len * sizeof(float));
1031 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *out,
1032 int *out_size, const uint8_t *in)
1034 int ret, in_size = pwd->ahi.packet_size - WMA_FRAME_SKIP;
1035 int16_t *samples = out;
1037 init_get_bits(&pwd->gb, in, in_size);
1038 if (pwd->ahi.use_bit_reservoir) {
1039 int i, nb_frames, bit_offset, pos, len;
1042 /* read super frame header */
1043 skip_bits(&pwd->gb, 4); /* super frame index */
1044 nb_frames = get_bits(&pwd->gb, 4) - 1;
1045 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1046 ret = -E_WMA_OUTPUT_SPACE;
1047 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1048 * sizeof(int16_t) > *out_size)
1051 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1053 if (pwd->last_superframe_len > 0) {
1054 /* add bit_offset bits to last frame */
1055 ret = -E_WMA_BAD_SUPERFRAME;
1056 if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1057 MAX_CODED_SUPERFRAME_SIZE)
1059 q = pwd->last_superframe + pwd->last_superframe_len;
1062 *q++ = get_bits(&pwd->gb, 8);
1066 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1068 /* XXX: bit_offset bits into last frame */
1069 init_get_bits(&pwd->gb, pwd->last_superframe,
1070 MAX_CODED_SUPERFRAME_SIZE);
1071 /* skip unused bits */
1072 if (pwd->last_bitoffset > 0)
1073 skip_bits(&pwd->gb, pwd->last_bitoffset);
1075 * This frame is stored in the last superframe and in
1078 ret = wma_decode_frame(pwd, samples);
1081 samples += pwd->ahi.channels * pwd->frame_len;
1084 /* read each frame starting from bit_offset */
1085 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1086 init_get_bits(&pwd->gb, in + (pos >> 3),
1087 (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1090 skip_bits(&pwd->gb, len);
1092 pwd->reset_block_lengths = true;
1093 for (i = 0; i < nb_frames; i++) {
1094 ret = wma_decode_frame(pwd, samples);
1097 samples += pwd->ahi.channels * pwd->frame_len;
1100 /* we copy the end of the frame in the last frame buffer */
1101 pos = get_bits_count(&pwd->gb) +
1102 ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1103 pwd->last_bitoffset = pos & 7;
1105 len = in_size - pos;
1106 ret = -E_WMA_BAD_SUPERFRAME;
1107 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1109 pwd->last_superframe_len = len;
1110 memcpy(pwd->last_superframe, in + pos, len);
1112 PARA_DEBUG_LOG("not using bit reservoir\n");
1113 ret = -E_WMA_OUTPUT_SPACE;
1114 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *out_size)
1116 /* single frame decode */
1117 ret = wma_decode_frame(pwd, samples);
1120 samples += pwd->ahi.channels * pwd->frame_len;
1122 PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1123 pwd->frame_len, pwd->block_len,
1124 (int)((int8_t *)samples - (int8_t *)out), pwd->ahi.block_align);
1125 *out_size = (int8_t *)samples - (int8_t *)out;
1126 return pwd->ahi.block_align;
1128 /* reset the bit reservoir on errors */
1129 pwd->last_superframe_len = 0;
1133 static void wmadec_close(struct filter_node *fn)
1135 struct private_wmadec_data *pwd = fn->private_data;
1140 for (i = 0; i < pwd->nb_block_sizes; i++)
1141 imdct_end(pwd->mdct_ctx[i]);
1142 if (pwd->ahi.use_exp_vlc)
1143 free_vlc(&pwd->exp_vlc);
1144 if (pwd->use_noise_coding)
1145 free_vlc(&pwd->hgain_vlc);
1146 for (i = 0; i < 2; i++) {
1147 free_vlc(&pwd->coef_vlc[i]);
1148 free(pwd->run_table[i]);
1149 free(pwd->level_table[i]);
1151 free(fn->private_data);
1152 fn->private_data = NULL;
1155 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1157 struct filter_node *fn = btr_context(btrn);
1158 struct private_wmadec_data *pwd = fn->private_data;
1160 return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1164 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1166 static int wmadec_post_select(__a_unused struct sched *s, void *context)
1168 struct filter_node *fn = context;
1169 int ret, converted, out_size;
1170 struct private_wmadec_data *pwd = fn->private_data;
1171 struct btr_node *btrn = fn->btrn;
1177 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1182 btr_merge(btrn, fn->min_iqs);
1183 len = btr_next_buffer(btrn, &in);
1184 ret = -E_WMADEC_EOF;
1185 if (len < fn->min_iqs)
1188 ret = wma_decode_init(in, len, &pwd);
1192 fn->min_iqs += 4096;
1195 fn->min_iqs = 2 * pwd->ahi.packet_size;
1196 fn->private_data = pwd;
1197 converted = pwd->ahi.header_len;
1200 fn->min_iqs = pwd->ahi.packet_size;
1201 if (fn->min_iqs > len)
1203 out_size = WMA_OUTPUT_BUFFER_SIZE;
1204 out = para_malloc(out_size);
1205 ret = wma_decode_superframe(pwd, out, &out_size,
1206 (uint8_t *)in + WMA_FRAME_SKIP);
1212 out = para_realloc(out, out_size);
1213 btr_add_output(out, out_size, btrn);
1216 converted += pwd->ahi.packet_size;
1218 btr_consume(btrn, converted);
1222 btr_remove_node(&fn->btrn);
1226 static void wmadec_open(struct filter_node *fn)
1228 fn->private_data = NULL;
1232 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1233 .open = wmadec_open,
1234 .close = wmadec_close,
1235 .execute = wmadec_execute,
1236 .pre_select = generic_filter_pre_select,
1237 .post_select = wmadec_post_select,