Libav
|
00001 /* 00002 * Wmapro compatible decoder 00003 * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion 00004 * Copyright (c) 2008 - 2009 Sascha Sommer, Benjamin Larsson 00005 * 00006 * This file is part of FFmpeg. 00007 * 00008 * FFmpeg is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * FFmpeg is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with FFmpeg; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00089 #include "avcodec.h" 00090 #include "internal.h" 00091 #include "get_bits.h" 00092 #include "put_bits.h" 00093 #include "wmaprodata.h" 00094 #include "dsputil.h" 00095 #include "wma.h" 00096 00098 #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels 00099 #define MAX_SUBFRAMES 32 ///< max number of subframes per channel 00100 #define MAX_BANDS 29 ///< max number of scale factor bands 00101 #define MAX_FRAMESIZE 32768 ///< maximum compressed frame size 00102 00103 #define WMAPRO_BLOCK_MAX_BITS 12 ///< log2 of max block size 00104 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size 00105 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) ///< possible block sizes 00106 00107 00108 #define VLCBITS 9 00109 #define SCALEVLCBITS 8 00110 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS) 00111 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS) 00112 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS) 00113 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS) 00114 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS) 00115 00116 static VLC sf_vlc; 00117 static VLC sf_rl_vlc; 00118 static VLC vec4_vlc; 00119 static VLC vec2_vlc; 00120 static VLC vec1_vlc; 00121 static VLC coef_vlc[2]; 00122 static float sin64[33]; 00123 00127 typedef struct { 00128 int16_t prev_block_len; 00129 uint8_t transmit_coefs; 00130 uint8_t num_subframes; 00131 uint16_t subframe_len[MAX_SUBFRAMES]; 00132 uint16_t subframe_offset[MAX_SUBFRAMES]; 00133 uint8_t cur_subframe; 00134 uint16_t decoded_samples; 00135 uint8_t grouped; 00136 int quant_step; 00137 int8_t reuse_sf; 00138 int8_t scale_factor_step; 00139 int max_scale_factor; 00140 int saved_scale_factors[2][MAX_BANDS]; 00141 int8_t scale_factor_idx; 00142 int* scale_factors; 00143 uint8_t table_idx; 00144 float* coeffs; 00145 DECLARE_ALIGNED(16, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; 00146 } WMAProChannelCtx; 00147 00151 typedef struct { 00152 uint8_t num_channels; 00153 int8_t transform; 00154 int8_t transform_band[MAX_BANDS]; 00155 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS]; 00156 float* channel_data[WMAPRO_MAX_CHANNELS]; 00157 } WMAProChannelGrp; 00158 00162 typedef struct WMAProDecodeCtx { 00163 /* generic decoder variables */ 00164 AVCodecContext* avctx; 00165 DSPContext dsp; 00166 uint8_t frame_data[MAX_FRAMESIZE + 00167 FF_INPUT_BUFFER_PADDING_SIZE]; 00168 PutBitContext pb; 00169 FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; 00170 DECLARE_ALIGNED(16, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; 00171 float* windows[WMAPRO_BLOCK_SIZES]; 00172 00173 /* frame size dependent frame information (set during initialization) */ 00174 uint32_t decode_flags; 00175 uint8_t len_prefix; 00176 uint8_t dynamic_range_compression; 00177 uint8_t bits_per_sample; 00178 uint16_t samples_per_frame; 00179 uint16_t log2_frame_size; 00180 int8_t num_channels; 00181 int8_t lfe_channel; 00182 uint8_t max_num_subframes; 00183 uint8_t subframe_len_bits; 00184 uint8_t max_subframe_len_bit; 00185 uint16_t min_samples_per_subframe; 00186 int8_t num_sfb[WMAPRO_BLOCK_SIZES]; 00187 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; 00188 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; 00189 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; 00190 00191 /* packet decode state */ 00192 GetBitContext pgb; 00193 uint8_t packet_offset; 00194 uint8_t packet_sequence_number; 00195 int num_saved_bits; 00196 int frame_offset; 00197 int subframe_offset; 00198 uint8_t packet_loss; 00199 uint8_t packet_done; 00200 00201 /* frame decode state */ 00202 uint32_t frame_num; 00203 GetBitContext gb; 00204 int buf_bit_size; 00205 float* samples; 00206 float* samples_end; 00207 uint8_t drc_gain; 00208 int8_t skip_frame; 00209 int8_t parsed_all_subframes; 00210 00211 /* subframe/block decode state */ 00212 int16_t subframe_len; 00213 int8_t channels_for_cur_subframe; 00214 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS]; 00215 int8_t num_bands; 00216 int16_t* cur_sfb_offsets; 00217 uint8_t table_idx; 00218 int8_t esc_len; 00219 00220 uint8_t num_chgroups; 00221 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; 00222 00223 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS]; 00224 } WMAProDecodeCtx; 00225 00226 00231 static void av_cold dump_context(WMAProDecodeCtx *s) 00232 { 00233 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b); 00234 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b); 00235 00236 PRINT("ed sample bit depth", s->bits_per_sample); 00237 PRINT_HEX("ed decode flags", s->decode_flags); 00238 PRINT("samples per frame", s->samples_per_frame); 00239 PRINT("log2 frame size", s->log2_frame_size); 00240 PRINT("max num subframes", s->max_num_subframes); 00241 PRINT("len prefix", s->len_prefix); 00242 PRINT("num channels", s->num_channels); 00243 } 00244 00250 static av_cold int decode_end(AVCodecContext *avctx) 00251 { 00252 WMAProDecodeCtx *s = avctx->priv_data; 00253 int i; 00254 00255 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) 00256 ff_mdct_end(&s->mdct_ctx[i]); 00257 00258 return 0; 00259 } 00260 00266 static av_cold int decode_init(AVCodecContext *avctx) 00267 { 00268 WMAProDecodeCtx *s = avctx->priv_data; 00269 uint8_t *edata_ptr = avctx->extradata; 00270 unsigned int channel_mask; 00271 int i; 00272 int log2_max_num_subframes; 00273 int num_possible_block_sizes; 00274 00275 s->avctx = avctx; 00276 dsputil_init(&s->dsp, avctx); 00277 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); 00278 00279 avctx->sample_fmt = SAMPLE_FMT_FLT; 00280 00281 if (avctx->extradata_size >= 18) { 00282 s->decode_flags = AV_RL16(edata_ptr+14); 00283 channel_mask = AV_RL32(edata_ptr+2); 00284 s->bits_per_sample = AV_RL16(edata_ptr); 00286 for (i = 0; i < avctx->extradata_size; i++) 00287 dprintf(avctx, "[%x] ", avctx->extradata[i]); 00288 dprintf(avctx, "\n"); 00289 00290 } else { 00291 av_log_ask_for_sample(avctx, "Unknown extradata size\n"); 00292 return AVERROR_INVALIDDATA; 00293 } 00294 00296 s->log2_frame_size = av_log2(avctx->block_align) + 4; 00297 00299 s->skip_frame = 1; 00300 s->packet_loss = 1; 00301 s->len_prefix = (s->decode_flags & 0x40); 00302 00303 if (!s->len_prefix) { 00304 av_log_ask_for_sample(avctx, "no length prefix\n"); 00305 return AVERROR_INVALIDDATA; 00306 } 00307 00309 s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate, 00310 3, s->decode_flags); 00311 00313 for (i = 0; i < avctx->channels; i++) 00314 s->channel[i].prev_block_len = s->samples_per_frame; 00315 00317 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3); 00318 s->max_num_subframes = 1 << log2_max_num_subframes; 00319 if (s->max_num_subframes == 16) 00320 s->max_subframe_len_bit = 1; 00321 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1; 00322 00323 num_possible_block_sizes = log2_max_num_subframes + 1; 00324 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes; 00325 s->dynamic_range_compression = (s->decode_flags & 0x80); 00326 00327 if (s->max_num_subframes > MAX_SUBFRAMES) { 00328 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n", 00329 s->max_num_subframes); 00330 return AVERROR_INVALIDDATA; 00331 } 00332 00333 s->num_channels = avctx->channels; 00334 00336 s->lfe_channel = -1; 00337 00338 if (channel_mask & 8) { 00339 unsigned int mask; 00340 for (mask = 1; mask < 16; mask <<= 1) { 00341 if (channel_mask & mask) 00342 ++s->lfe_channel; 00343 } 00344 } 00345 00346 if (s->num_channels < 0) { 00347 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels); 00348 return AVERROR_INVALIDDATA; 00349 } else if (s->num_channels > WMAPRO_MAX_CHANNELS) { 00350 av_log_ask_for_sample(avctx, "unsupported number of channels\n"); 00351 return AVERROR_PATCHWELCOME; 00352 } 00353 00354 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE, 00355 scale_huffbits, 1, 1, 00356 scale_huffcodes, 2, 2, 616); 00357 00358 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE, 00359 scale_rl_huffbits, 1, 1, 00360 scale_rl_huffcodes, 4, 4, 1406); 00361 00362 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE, 00363 coef0_huffbits, 1, 1, 00364 coef0_huffcodes, 4, 4, 2108); 00365 00366 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE, 00367 coef1_huffbits, 1, 1, 00368 coef1_huffcodes, 4, 4, 3912); 00369 00370 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE, 00371 vec4_huffbits, 1, 1, 00372 vec4_huffcodes, 2, 2, 604); 00373 00374 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE, 00375 vec2_huffbits, 1, 1, 00376 vec2_huffcodes, 2, 2, 562); 00377 00378 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE, 00379 vec1_huffbits, 1, 1, 00380 vec1_huffcodes, 2, 2, 562); 00381 00384 for (i = 0; i < num_possible_block_sizes; i++) { 00385 int subframe_len = s->samples_per_frame >> i; 00386 int x; 00387 int band = 1; 00388 00389 s->sfb_offsets[i][0] = 0; 00390 00391 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) { 00392 int offset = (subframe_len * 2 * critical_freq[x]) 00393 / s->avctx->sample_rate + 2; 00394 offset &= ~3; 00395 if (offset > s->sfb_offsets[i][band - 1]) 00396 s->sfb_offsets[i][band++] = offset; 00397 } 00398 s->sfb_offsets[i][band - 1] = subframe_len; 00399 s->num_sfb[i] = band - 1; 00400 } 00401 00402 00408 for (i = 0; i < num_possible_block_sizes; i++) { 00409 int b; 00410 for (b = 0; b < s->num_sfb[i]; b++) { 00411 int x; 00412 int offset = ((s->sfb_offsets[i][b] 00413 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1; 00414 for (x = 0; x < num_possible_block_sizes; x++) { 00415 int v = 0; 00416 while (s->sfb_offsets[x][v + 1] << x < offset) 00417 ++v; 00418 s->sf_offsets[i][x][b] = v; 00419 } 00420 } 00421 } 00422 00424 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) 00425 ff_mdct_init(&s->mdct_ctx[i], BLOCK_MIN_BITS+1+i, 1, 00426 1.0 / (1 << (BLOCK_MIN_BITS + i - 1)) 00427 / (1 << (s->bits_per_sample - 1))); 00428 00430 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) { 00431 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i; 00432 ff_init_ff_sine_windows(win_idx); 00433 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx]; 00434 } 00435 00437 for (i = 0; i < num_possible_block_sizes; i++) { 00438 int block_size = s->samples_per_frame >> i; 00439 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1) 00440 / s->avctx->sample_rate; 00441 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size); 00442 } 00443 00445 for (i = 0; i < 33; i++) 00446 sin64[i] = sin(i*M_PI / 64.0); 00447 00448 if (avctx->debug & FF_DEBUG_BITSTREAM) 00449 dump_context(s); 00450 00451 avctx->channel_layout = channel_mask; 00452 return 0; 00453 } 00454 00461 static int decode_subframe_length(WMAProDecodeCtx *s, int offset) 00462 { 00463 int frame_len_shift = 0; 00464 int subframe_len; 00465 00467 if (offset == s->samples_per_frame - s->min_samples_per_subframe) 00468 return s->min_samples_per_subframe; 00469 00471 if (s->max_subframe_len_bit) { 00472 if (get_bits1(&s->gb)) 00473 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1); 00474 } else 00475 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits); 00476 00477 subframe_len = s->samples_per_frame >> frame_len_shift; 00478 00480 if (subframe_len < s->min_samples_per_subframe || 00481 subframe_len > s->samples_per_frame) { 00482 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n", 00483 subframe_len); 00484 return AVERROR_INVALIDDATA; 00485 } 00486 return subframe_len; 00487 } 00488 00509 static int decode_tilehdr(WMAProDecodeCtx *s) 00510 { 00511 uint16_t num_samples[WMAPRO_MAX_CHANNELS]; 00512 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; 00513 int channels_for_cur_subframe = s->num_channels; 00514 int fixed_channel_layout = 0; 00515 int min_channel_len = 0; 00516 int c; 00517 00518 /* Should never consume more than 3073 bits (256 iterations for the 00519 * while loop when always the minimum amount of 128 samples is substracted 00520 * from missing samples in the 8 channel case). 00521 * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4) 00522 */ 00523 00525 for (c = 0; c < s->num_channels; c++) 00526 s->channel[c].num_subframes = 0; 00527 00528 memset(num_samples, 0, sizeof(num_samples)); 00529 00530 if (s->max_num_subframes == 1 || get_bits1(&s->gb)) 00531 fixed_channel_layout = 1; 00532 00534 do { 00535 int subframe_len; 00536 00538 for (c = 0; c < s->num_channels; c++) { 00539 if (num_samples[c] == min_channel_len) { 00540 if (fixed_channel_layout || channels_for_cur_subframe == 1 || 00541 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe)) 00542 contains_subframe[c] = 1; 00543 else 00544 contains_subframe[c] = get_bits1(&s->gb); 00545 } else 00546 contains_subframe[c] = 0; 00547 } 00548 00550 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0) 00551 return AVERROR_INVALIDDATA; 00552 00554 min_channel_len += subframe_len; 00555 for (c = 0; c < s->num_channels; c++) { 00556 WMAProChannelCtx* chan = &s->channel[c]; 00557 00558 if (contains_subframe[c]) { 00559 if (chan->num_subframes >= MAX_SUBFRAMES) { 00560 av_log(s->avctx, AV_LOG_ERROR, 00561 "broken frame: num subframes > 31\n"); 00562 return AVERROR_INVALIDDATA; 00563 } 00564 chan->subframe_len[chan->num_subframes] = subframe_len; 00565 num_samples[c] += subframe_len; 00566 ++chan->num_subframes; 00567 if (num_samples[c] > s->samples_per_frame) { 00568 av_log(s->avctx, AV_LOG_ERROR, "broken frame: " 00569 "channel len > samples_per_frame\n"); 00570 return AVERROR_INVALIDDATA; 00571 } 00572 } else if (num_samples[c] <= min_channel_len) { 00573 if (num_samples[c] < min_channel_len) { 00574 channels_for_cur_subframe = 0; 00575 min_channel_len = num_samples[c]; 00576 } 00577 ++channels_for_cur_subframe; 00578 } 00579 } 00580 } while (min_channel_len < s->samples_per_frame); 00581 00582 for (c = 0; c < s->num_channels; c++) { 00583 int i; 00584 int offset = 0; 00585 for (i = 0; i < s->channel[c].num_subframes; i++) { 00586 dprintf(s->avctx, "frame[%i] channel[%i] subframe[%i]" 00587 " len %i\n", s->frame_num, c, i, 00588 s->channel[c].subframe_len[i]); 00589 s->channel[c].subframe_offset[i] = offset; 00590 offset += s->channel[c].subframe_len[i]; 00591 } 00592 } 00593 00594 return 0; 00595 } 00596 00602 static void decode_decorrelation_matrix(WMAProDecodeCtx *s, 00603 WMAProChannelGrp *chgroup) 00604 { 00605 int i; 00606 int offset = 0; 00607 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS]; 00608 memset(chgroup->decorrelation_matrix, 0, s->num_channels * 00609 s->num_channels * sizeof(*chgroup->decorrelation_matrix)); 00610 00611 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++) 00612 rotation_offset[i] = get_bits(&s->gb, 6); 00613 00614 for (i = 0; i < chgroup->num_channels; i++) 00615 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] = 00616 get_bits1(&s->gb) ? 1.0 : -1.0; 00617 00618 for (i = 1; i < chgroup->num_channels; i++) { 00619 int x; 00620 for (x = 0; x < i; x++) { 00621 int y; 00622 for (y = 0; y < i + 1; y++) { 00623 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y]; 00624 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y]; 00625 int n = rotation_offset[offset + x]; 00626 float sinv; 00627 float cosv; 00628 00629 if (n < 32) { 00630 sinv = sin64[n]; 00631 cosv = sin64[32 - n]; 00632 } else { 00633 sinv = sin64[64 - n]; 00634 cosv = -sin64[n - 32]; 00635 } 00636 00637 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] = 00638 (v1 * sinv) - (v2 * cosv); 00639 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] = 00640 (v1 * cosv) + (v2 * sinv); 00641 } 00642 } 00643 offset += i; 00644 } 00645 } 00646 00652 static int decode_channel_transform(WMAProDecodeCtx* s) 00653 { 00654 int i; 00655 /* should never consume more than 1921 bits for the 8 channel case 00656 * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS 00657 * + MAX_CHANNELS + MAX_BANDS + 1) 00658 */ 00659 00661 s->num_chgroups = 0; 00662 if (s->num_channels > 1) { 00663 int remaining_channels = s->channels_for_cur_subframe; 00664 00665 if (get_bits1(&s->gb)) { 00666 av_log_ask_for_sample(s->avctx, 00667 "unsupported channel transform bit\n"); 00668 return AVERROR_INVALIDDATA; 00669 } 00670 00671 for (s->num_chgroups = 0; remaining_channels && 00672 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) { 00673 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups]; 00674 float** channel_data = chgroup->channel_data; 00675 chgroup->num_channels = 0; 00676 chgroup->transform = 0; 00677 00679 if (remaining_channels > 2) { 00680 for (i = 0; i < s->channels_for_cur_subframe; i++) { 00681 int channel_idx = s->channel_indexes_for_cur_subframe[i]; 00682 if (!s->channel[channel_idx].grouped 00683 && get_bits1(&s->gb)) { 00684 ++chgroup->num_channels; 00685 s->channel[channel_idx].grouped = 1; 00686 *channel_data++ = s->channel[channel_idx].coeffs; 00687 } 00688 } 00689 } else { 00690 chgroup->num_channels = remaining_channels; 00691 for (i = 0; i < s->channels_for_cur_subframe; i++) { 00692 int channel_idx = s->channel_indexes_for_cur_subframe[i]; 00693 if (!s->channel[channel_idx].grouped) 00694 *channel_data++ = s->channel[channel_idx].coeffs; 00695 s->channel[channel_idx].grouped = 1; 00696 } 00697 } 00698 00700 if (chgroup->num_channels == 2) { 00701 if (get_bits1(&s->gb)) { 00702 if (get_bits1(&s->gb)) { 00703 av_log_ask_for_sample(s->avctx, 00704 "unsupported channel transform type\n"); 00705 } 00706 } else { 00707 chgroup->transform = 1; 00708 if (s->num_channels == 2) { 00709 chgroup->decorrelation_matrix[0] = 1.0; 00710 chgroup->decorrelation_matrix[1] = -1.0; 00711 chgroup->decorrelation_matrix[2] = 1.0; 00712 chgroup->decorrelation_matrix[3] = 1.0; 00713 } else { 00715 chgroup->decorrelation_matrix[0] = 0.70703125; 00716 chgroup->decorrelation_matrix[1] = -0.70703125; 00717 chgroup->decorrelation_matrix[2] = 0.70703125; 00718 chgroup->decorrelation_matrix[3] = 0.70703125; 00719 } 00720 } 00721 } else if (chgroup->num_channels > 2) { 00722 if (get_bits1(&s->gb)) { 00723 chgroup->transform = 1; 00724 if (get_bits1(&s->gb)) { 00725 decode_decorrelation_matrix(s, chgroup); 00726 } else { 00728 if (chgroup->num_channels > 6) { 00729 av_log_ask_for_sample(s->avctx, 00730 "coupled channels > 6\n"); 00731 } else { 00732 memcpy(chgroup->decorrelation_matrix, 00733 default_decorrelation[chgroup->num_channels], 00734 chgroup->num_channels * chgroup->num_channels * 00735 sizeof(*chgroup->decorrelation_matrix)); 00736 } 00737 } 00738 } 00739 } 00740 00742 if (chgroup->transform) { 00743 if (!get_bits1(&s->gb)) { 00744 int i; 00746 for (i = 0; i < s->num_bands; i++) { 00747 chgroup->transform_band[i] = get_bits1(&s->gb); 00748 } 00749 } else { 00750 memset(chgroup->transform_band, 1, s->num_bands); 00751 } 00752 } 00753 remaining_channels -= chgroup->num_channels; 00754 } 00755 } 00756 return 0; 00757 } 00758 00765 static int decode_coeffs(WMAProDecodeCtx *s, int c) 00766 { 00767 /* Integers 0..15 as single-precision floats. The table saves a 00768 costly int to float conversion, and storing the values as 00769 integers allows fast sign-flipping. */ 00770 static const int fval_tab[16] = { 00771 0x00000000, 0x3f800000, 0x40000000, 0x40400000, 00772 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000, 00773 0x41000000, 0x41100000, 0x41200000, 0x41300000, 00774 0x41400000, 0x41500000, 0x41600000, 0x41700000, 00775 }; 00776 int vlctable; 00777 VLC* vlc; 00778 WMAProChannelCtx* ci = &s->channel[c]; 00779 int rl_mode = 0; 00780 int cur_coeff = 0; 00781 int num_zeros = 0; 00782 const uint16_t* run; 00783 const float* level; 00784 00785 dprintf(s->avctx, "decode coefficients for channel %i\n", c); 00786 00787 vlctable = get_bits1(&s->gb); 00788 vlc = &coef_vlc[vlctable]; 00789 00790 if (vlctable) { 00791 run = coef1_run; 00792 level = coef1_level; 00793 } else { 00794 run = coef0_run; 00795 level = coef0_level; 00796 } 00797 00800 while (!rl_mode && cur_coeff + 3 < s->subframe_len) { 00801 int vals[4]; 00802 int i; 00803 unsigned int idx; 00804 00805 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH); 00806 00807 if (idx == HUFF_VEC4_SIZE - 1) { 00808 for (i = 0; i < 4; i += 2) { 00809 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH); 00810 if (idx == HUFF_VEC2_SIZE - 1) { 00811 int v0, v1; 00812 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); 00813 if (v0 == HUFF_VEC1_SIZE - 1) 00814 v0 += ff_wma_get_large_val(&s->gb); 00815 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); 00816 if (v1 == HUFF_VEC1_SIZE - 1) 00817 v1 += ff_wma_get_large_val(&s->gb); 00818 ((float*)vals)[i ] = v0; 00819 ((float*)vals)[i+1] = v1; 00820 } else { 00821 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ]; 00822 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF]; 00823 } 00824 } 00825 } else { 00826 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ]; 00827 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF]; 00828 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF]; 00829 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF]; 00830 } 00831 00833 for (i = 0; i < 4; i++) { 00834 if (vals[i]) { 00835 int sign = get_bits1(&s->gb) - 1; 00836 *(uint32_t*)&ci->coeffs[cur_coeff] = vals[i] ^ sign<<31; 00837 num_zeros = 0; 00838 } else { 00839 ci->coeffs[cur_coeff] = 0; 00842 rl_mode |= (++num_zeros > s->subframe_len >> 8); 00843 } 00844 ++cur_coeff; 00845 } 00846 } 00847 00849 if (rl_mode) { 00850 memset(&ci->coeffs[cur_coeff], 0, 00851 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff)); 00852 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc, 00853 level, run, 1, ci->coeffs, 00854 cur_coeff, s->subframe_len, 00855 s->subframe_len, s->esc_len, 0)) 00856 return AVERROR_INVALIDDATA; 00857 } 00858 00859 return 0; 00860 } 00861 00867 static int decode_scale_factors(WMAProDecodeCtx* s) 00868 { 00869 int i; 00870 00875 for (i = 0; i < s->channels_for_cur_subframe; i++) { 00876 int c = s->channel_indexes_for_cur_subframe[i]; 00877 int* sf; 00878 int* sf_end; 00879 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx]; 00880 sf_end = s->channel[c].scale_factors + s->num_bands; 00881 00887 if (s->channel[c].reuse_sf) { 00888 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx]; 00889 int b; 00890 for (b = 0; b < s->num_bands; b++) 00891 s->channel[c].scale_factors[b] = 00892 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++]; 00893 } 00894 00895 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) { 00896 00897 if (!s->channel[c].reuse_sf) { 00898 int val; 00900 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1; 00901 val = 45 / s->channel[c].scale_factor_step; 00902 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) { 00903 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60; 00904 *sf = val; 00905 } 00906 } else { 00907 int i; 00909 for (i = 0; i < s->num_bands; i++) { 00910 int idx; 00911 int skip; 00912 int val; 00913 int sign; 00914 00915 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH); 00916 00917 if (!idx) { 00918 uint32_t code = get_bits(&s->gb, 14); 00919 val = code >> 6; 00920 sign = (code & 1) - 1; 00921 skip = (code & 0x3f) >> 1; 00922 } else if (idx == 1) { 00923 break; 00924 } else { 00925 skip = scale_rl_run[idx]; 00926 val = scale_rl_level[idx]; 00927 sign = get_bits1(&s->gb)-1; 00928 } 00929 00930 i += skip; 00931 if (i >= s->num_bands) { 00932 av_log(s->avctx, AV_LOG_ERROR, 00933 "invalid scale factor coding\n"); 00934 return AVERROR_INVALIDDATA; 00935 } 00936 s->channel[c].scale_factors[i] += (val ^ sign) - sign; 00937 } 00938 } 00940 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx; 00941 s->channel[c].table_idx = s->table_idx; 00942 s->channel[c].reuse_sf = 1; 00943 } 00944 00946 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0]; 00947 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) { 00948 s->channel[c].max_scale_factor = 00949 FFMAX(s->channel[c].max_scale_factor, *sf); 00950 } 00951 00952 } 00953 return 0; 00954 } 00955 00960 static void inverse_channel_transform(WMAProDecodeCtx *s) 00961 { 00962 int i; 00963 00964 for (i = 0; i < s->num_chgroups; i++) { 00965 if (s->chgroup[i].transform) { 00966 float data[WMAPRO_MAX_CHANNELS]; 00967 const int num_channels = s->chgroup[i].num_channels; 00968 float** ch_data = s->chgroup[i].channel_data; 00969 float** ch_end = ch_data + num_channels; 00970 const int8_t* tb = s->chgroup[i].transform_band; 00971 int16_t* sfb; 00972 00974 for (sfb = s->cur_sfb_offsets; 00975 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) { 00976 int y; 00977 if (*tb++ == 1) { 00979 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) { 00980 const float* mat = s->chgroup[i].decorrelation_matrix; 00981 const float* data_end = data + num_channels; 00982 float* data_ptr = data; 00983 float** ch; 00984 00985 for (ch = ch_data; ch < ch_end; ch++) 00986 *data_ptr++ = (*ch)[y]; 00987 00988 for (ch = ch_data; ch < ch_end; ch++) { 00989 float sum = 0; 00990 data_ptr = data; 00991 while (data_ptr < data_end) 00992 sum += *data_ptr++ * *mat++; 00993 00994 (*ch)[y] = sum; 00995 } 00996 } 00997 } else if (s->num_channels == 2) { 00998 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0]; 00999 s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0], 01000 ch_data[0] + sfb[0], 01001 181.0 / 128, len); 01002 s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0], 01003 ch_data[1] + sfb[0], 01004 181.0 / 128, len); 01005 } 01006 } 01007 } 01008 } 01009 } 01010 01015 static void wmapro_window(WMAProDecodeCtx *s) 01016 { 01017 int i; 01018 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01019 int c = s->channel_indexes_for_cur_subframe[i]; 01020 float* window; 01021 int winlen = s->channel[c].prev_block_len; 01022 float* start = s->channel[c].coeffs - (winlen >> 1); 01023 01024 if (s->subframe_len < winlen) { 01025 start += (winlen - s->subframe_len) >> 1; 01026 winlen = s->subframe_len; 01027 } 01028 01029 window = s->windows[av_log2(winlen) - BLOCK_MIN_BITS]; 01030 01031 winlen >>= 1; 01032 01033 s->dsp.vector_fmul_window(start, start, start + winlen, 01034 window, 0, winlen); 01035 01036 s->channel[c].prev_block_len = s->subframe_len; 01037 } 01038 } 01039 01045 static int decode_subframe(WMAProDecodeCtx *s) 01046 { 01047 int offset = s->samples_per_frame; 01048 int subframe_len = s->samples_per_frame; 01049 int i; 01050 int total_samples = s->samples_per_frame * s->num_channels; 01051 int transmit_coeffs = 0; 01052 int cur_subwoofer_cutoff; 01053 01054 s->subframe_offset = get_bits_count(&s->gb); 01055 01060 for (i = 0; i < s->num_channels; i++) { 01061 s->channel[i].grouped = 0; 01062 if (offset > s->channel[i].decoded_samples) { 01063 offset = s->channel[i].decoded_samples; 01064 subframe_len = 01065 s->channel[i].subframe_len[s->channel[i].cur_subframe]; 01066 } 01067 } 01068 01069 dprintf(s->avctx, 01070 "processing subframe with offset %i len %i\n", offset, subframe_len); 01071 01073 s->channels_for_cur_subframe = 0; 01074 for (i = 0; i < s->num_channels; i++) { 01075 const int cur_subframe = s->channel[i].cur_subframe; 01077 total_samples -= s->channel[i].decoded_samples; 01078 01080 if (offset == s->channel[i].decoded_samples && 01081 subframe_len == s->channel[i].subframe_len[cur_subframe]) { 01082 total_samples -= s->channel[i].subframe_len[cur_subframe]; 01083 s->channel[i].decoded_samples += 01084 s->channel[i].subframe_len[cur_subframe]; 01085 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i; 01086 ++s->channels_for_cur_subframe; 01087 } 01088 } 01089 01092 if (!total_samples) 01093 s->parsed_all_subframes = 1; 01094 01095 01096 dprintf(s->avctx, "subframe is part of %i channels\n", 01097 s->channels_for_cur_subframe); 01098 01100 s->table_idx = av_log2(s->samples_per_frame/subframe_len); 01101 s->num_bands = s->num_sfb[s->table_idx]; 01102 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx]; 01103 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx]; 01104 01106 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01107 int c = s->channel_indexes_for_cur_subframe[i]; 01108 01109 s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1) 01110 + offset]; 01111 } 01112 01113 s->subframe_len = subframe_len; 01114 s->esc_len = av_log2(s->subframe_len - 1) + 1; 01115 01117 if (get_bits1(&s->gb)) { 01118 int num_fill_bits; 01119 if (!(num_fill_bits = get_bits(&s->gb, 2))) { 01120 int len = get_bits(&s->gb, 4); 01121 num_fill_bits = get_bits(&s->gb, len) + 1; 01122 } 01123 01124 if (num_fill_bits >= 0) { 01125 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) { 01126 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n"); 01127 return AVERROR_INVALIDDATA; 01128 } 01129 01130 skip_bits_long(&s->gb, num_fill_bits); 01131 } 01132 } 01133 01135 if (get_bits1(&s->gb)) { 01136 av_log_ask_for_sample(s->avctx, "reserved bit set\n"); 01137 return AVERROR_INVALIDDATA; 01138 } 01139 01140 01141 if (decode_channel_transform(s) < 0) 01142 return AVERROR_INVALIDDATA; 01143 01144 01145 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01146 int c = s->channel_indexes_for_cur_subframe[i]; 01147 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb))) 01148 transmit_coeffs = 1; 01149 } 01150 01151 if (transmit_coeffs) { 01152 int step; 01153 int quant_step = 90 * s->bits_per_sample >> 4; 01154 if ((get_bits1(&s->gb))) { 01156 av_log_ask_for_sample(s->avctx, "unsupported quant step coding\n"); 01157 return AVERROR_INVALIDDATA; 01158 } 01160 step = get_sbits(&s->gb, 6); 01161 quant_step += step; 01162 if (step == -32 || step == 31) { 01163 const int sign = (step == 31) - 1; 01164 int quant = 0; 01165 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits && 01166 (step = get_bits(&s->gb, 5)) == 31) { 01167 quant += 31; 01168 } 01169 quant_step += ((quant + step) ^ sign) - sign; 01170 } 01171 if (quant_step < 0) { 01172 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n"); 01173 } 01174 01177 if (s->channels_for_cur_subframe == 1) { 01178 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step; 01179 } else { 01180 int modifier_len = get_bits(&s->gb, 3); 01181 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01182 int c = s->channel_indexes_for_cur_subframe[i]; 01183 s->channel[c].quant_step = quant_step; 01184 if (get_bits1(&s->gb)) { 01185 if (modifier_len) { 01186 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1; 01187 } else 01188 ++s->channel[c].quant_step; 01189 } 01190 } 01191 } 01192 01194 if (decode_scale_factors(s) < 0) 01195 return AVERROR_INVALIDDATA; 01196 } 01197 01198 dprintf(s->avctx, "BITSTREAM: subframe header length was %i\n", 01199 get_bits_count(&s->gb) - s->subframe_offset); 01200 01202 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01203 int c = s->channel_indexes_for_cur_subframe[i]; 01204 if (s->channel[c].transmit_coefs && 01205 get_bits_count(&s->gb) < s->num_saved_bits) { 01206 decode_coeffs(s, c); 01207 } else 01208 memset(s->channel[c].coeffs, 0, 01209 sizeof(*s->channel[c].coeffs) * subframe_len); 01210 } 01211 01212 dprintf(s->avctx, "BITSTREAM: subframe length was %i\n", 01213 get_bits_count(&s->gb) - s->subframe_offset); 01214 01215 if (transmit_coeffs) { 01217 inverse_channel_transform(s); 01218 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01219 int c = s->channel_indexes_for_cur_subframe[i]; 01220 const int* sf = s->channel[c].scale_factors; 01221 int b; 01222 01223 if (c == s->lfe_channel) 01224 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) * 01225 (subframe_len - cur_subwoofer_cutoff)); 01226 01228 for (b = 0; b < s->num_bands; b++) { 01229 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len); 01230 const int exp = s->channel[c].quant_step - 01231 (s->channel[c].max_scale_factor - *sf++) * 01232 s->channel[c].scale_factor_step; 01233 const float quant = pow(10.0, exp / 20.0); 01234 int start = s->cur_sfb_offsets[b]; 01235 s->dsp.vector_fmul_scalar(s->tmp + start, 01236 s->channel[c].coeffs + start, 01237 quant, end - start); 01238 } 01239 01241 ff_imdct_half(&s->mdct_ctx[av_log2(subframe_len) - BLOCK_MIN_BITS], 01242 s->channel[c].coeffs, s->tmp); 01243 } 01244 } 01245 01247 wmapro_window(s); 01248 01250 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01251 int c = s->channel_indexes_for_cur_subframe[i]; 01252 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) { 01253 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n"); 01254 return AVERROR_INVALIDDATA; 01255 } 01256 ++s->channel[c].cur_subframe; 01257 } 01258 01259 return 0; 01260 } 01261 01268 static int decode_frame(WMAProDecodeCtx *s) 01269 { 01270 GetBitContext* gb = &s->gb; 01271 int more_frames = 0; 01272 int len = 0; 01273 int i; 01274 01276 if (s->num_channels * s->samples_per_frame > s->samples_end - s->samples) { 01278 av_log(s->avctx, AV_LOG_ERROR, 01279 "not enough space for the output samples\n"); 01280 s->packet_loss = 1; 01281 return 0; 01282 } 01283 01285 if (s->len_prefix) 01286 len = get_bits(gb, s->log2_frame_size); 01287 01288 dprintf(s->avctx, "decoding frame with length %x\n", len); 01289 01291 if (decode_tilehdr(s)) { 01292 s->packet_loss = 1; 01293 return 0; 01294 } 01295 01297 if (s->num_channels > 1 && get_bits1(gb)) { 01298 av_log_ask_for_sample(s->avctx, "Unsupported postproc transform found\n"); 01299 s->packet_loss = 1; 01300 return 0; 01301 } 01302 01304 if (s->dynamic_range_compression) { 01305 s->drc_gain = get_bits(gb, 8); 01306 dprintf(s->avctx, "drc_gain %i\n", s->drc_gain); 01307 } 01308 01311 if (get_bits1(gb)) { 01312 int skip; 01313 01315 if (get_bits1(gb)) { 01316 skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); 01317 dprintf(s->avctx, "start skip: %i\n", skip); 01318 } 01319 01321 if (get_bits1(gb)) { 01322 skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); 01323 dprintf(s->avctx, "end skip: %i\n", skip); 01324 } 01325 01326 } 01327 01328 dprintf(s->avctx, "BITSTREAM: frame header length was %i\n", 01329 get_bits_count(gb) - s->frame_offset); 01330 01332 s->parsed_all_subframes = 0; 01333 for (i = 0; i < s->num_channels; i++) { 01334 s->channel[i].decoded_samples = 0; 01335 s->channel[i].cur_subframe = 0; 01336 s->channel[i].reuse_sf = 0; 01337 } 01338 01340 while (!s->parsed_all_subframes) { 01341 if (decode_subframe(s) < 0) { 01342 s->packet_loss = 1; 01343 return 0; 01344 } 01345 } 01346 01348 for (i = 0; i < s->num_channels; i++) { 01349 float* ptr = s->samples + i; 01350 int incr = s->num_channels; 01351 float* iptr = s->channel[i].out; 01352 float* iend = iptr + s->samples_per_frame; 01353 01354 // FIXME should create/use a DSP function here 01355 while (iptr < iend) { 01356 *ptr = *iptr++; 01357 ptr += incr; 01358 } 01359 01361 memcpy(&s->channel[i].out[0], 01362 &s->channel[i].out[s->samples_per_frame], 01363 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1); 01364 } 01365 01366 if (s->skip_frame) { 01367 s->skip_frame = 0; 01368 } else 01369 s->samples += s->num_channels * s->samples_per_frame; 01370 01371 if (len != (get_bits_count(gb) - s->frame_offset) + 2) { 01373 av_log(s->avctx, AV_LOG_ERROR, "frame[%i] would have to skip %i bits\n", 01374 s->frame_num, len - (get_bits_count(gb) - s->frame_offset) - 1); 01375 s->packet_loss = 1; 01376 return 0; 01377 } 01378 01380 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1); 01381 01383 more_frames = get_bits1(gb); 01384 01385 ++s->frame_num; 01386 return more_frames; 01387 } 01388 01395 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb) 01396 { 01397 return s->buf_bit_size - get_bits_count(gb); 01398 } 01399 01407 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len, 01408 int append) 01409 { 01410 int buflen; 01411 01416 if (!append) { 01417 s->frame_offset = get_bits_count(gb) & 7; 01418 s->num_saved_bits = s->frame_offset; 01419 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); 01420 } 01421 01422 buflen = (s->num_saved_bits + len + 8) >> 3; 01423 01424 if (len <= 0 || buflen > MAX_FRAMESIZE) { 01425 av_log_ask_for_sample(s->avctx, "input buffer too small\n"); 01426 s->packet_loss = 1; 01427 return; 01428 } 01429 01430 s->num_saved_bits += len; 01431 if (!append) { 01432 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), 01433 s->num_saved_bits); 01434 } else { 01435 int align = 8 - (get_bits_count(gb) & 7); 01436 align = FFMIN(align, len); 01437 put_bits(&s->pb, align, get_bits(gb, align)); 01438 len -= align; 01439 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len); 01440 } 01441 skip_bits_long(gb, len); 01442 01443 { 01444 PutBitContext tmp = s->pb; 01445 flush_put_bits(&tmp); 01446 } 01447 01448 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits); 01449 skip_bits(&s->gb, s->frame_offset); 01450 } 01451 01460 static int decode_packet(AVCodecContext *avctx, 01461 void *data, int *data_size, AVPacket* avpkt) 01462 { 01463 WMAProDecodeCtx *s = avctx->priv_data; 01464 GetBitContext* gb = &s->pgb; 01465 const uint8_t* buf = avpkt->data; 01466 int buf_size = avpkt->size; 01467 int num_bits_prev_frame; 01468 int packet_sequence_number; 01469 01470 s->samples = data; 01471 s->samples_end = (float*)((int8_t*)data + *data_size); 01472 *data_size = 0; 01473 01474 if (s->packet_done || s->packet_loss) { 01475 s->packet_done = 0; 01476 s->buf_bit_size = buf_size << 3; 01477 01479 if (buf_size < avctx->block_align) 01480 return 0; 01481 01482 buf_size = avctx->block_align; 01483 01485 init_get_bits(gb, buf, s->buf_bit_size); 01486 packet_sequence_number = get_bits(gb, 4); 01487 skip_bits(gb, 2); 01488 01490 num_bits_prev_frame = get_bits(gb, s->log2_frame_size); 01491 dprintf(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number, 01492 num_bits_prev_frame); 01493 01495 if (!s->packet_loss && 01496 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) { 01497 s->packet_loss = 1; 01498 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n", 01499 s->packet_sequence_number, packet_sequence_number); 01500 } 01501 s->packet_sequence_number = packet_sequence_number; 01502 01503 if (num_bits_prev_frame > 0) { 01506 save_bits(s, gb, num_bits_prev_frame, 1); 01507 dprintf(avctx, "accumulated %x bits of frame data\n", 01508 s->num_saved_bits - s->frame_offset); 01509 01511 if (!s->packet_loss) 01512 decode_frame(s); 01513 } else if (s->num_saved_bits - s->frame_offset) { 01514 dprintf(avctx, "ignoring %x previously saved bits\n", 01515 s->num_saved_bits - s->frame_offset); 01516 } 01517 01518 s->packet_loss = 0; 01519 01520 } else { 01521 int frame_size; 01522 s->buf_bit_size = avpkt->size << 3; 01523 init_get_bits(gb, avpkt->data, s->buf_bit_size); 01524 skip_bits(gb, s->packet_offset); 01525 if (remaining_bits(s, gb) > s->log2_frame_size && 01526 (frame_size = show_bits(gb, s->log2_frame_size)) && 01527 frame_size <= remaining_bits(s, gb)) { 01528 save_bits(s, gb, frame_size, 0); 01529 s->packet_done = !decode_frame(s); 01530 } else 01531 s->packet_done = 1; 01532 } 01533 01534 if (s->packet_done && !s->packet_loss && 01535 remaining_bits(s, gb) > 0) { 01538 save_bits(s, gb, remaining_bits(s, gb), 0); 01539 } 01540 01541 *data_size = (int8_t *)s->samples - (int8_t *)data; 01542 s->packet_offset = get_bits_count(gb) & 7; 01543 01544 return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3; 01545 } 01546 01551 static void flush(AVCodecContext *avctx) 01552 { 01553 WMAProDecodeCtx *s = avctx->priv_data; 01554 int i; 01557 for (i = 0; i < s->num_channels; i++) 01558 memset(s->channel[i].out, 0, s->samples_per_frame * 01559 sizeof(*s->channel[i].out)); 01560 s->packet_loss = 1; 01561 } 01562 01563 01567 AVCodec wmapro_decoder = { 01568 "wmapro", 01569 AVMEDIA_TYPE_AUDIO, 01570 CODEC_ID_WMAPRO, 01571 sizeof(WMAProDecodeCtx), 01572 decode_init, 01573 NULL, 01574 decode_end, 01575 decode_packet, 01576 .capabilities = CODEC_CAP_SUBFRAMES, 01577 .flush= flush, 01578 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"), 01579 };