00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00089 #include "libavutil/intfloat.h"
00090 #include "libavutil/intreadwrite.h"
00091 #include "avcodec.h"
00092 #include "internal.h"
00093 #include "get_bits.h"
00094 #include "put_bits.h"
00095 #include "wmaprodata.h"
00096 #include "dsputil.h"
00097 #include "fmtconvert.h"
00098 #include "sinewin.h"
00099 #include "wma.h"
00100
00102 #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels
00103 #define MAX_SUBFRAMES 32 ///< max number of subframes per channel
00104 #define MAX_BANDS 29 ///< max number of scale factor bands
00105 #define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
00106
00107 #define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size
00108 #define WMAPRO_BLOCK_MAX_BITS 12 ///< log2 of max block size
00109 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size
00110 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
00111
00112
00113 #define VLCBITS 9
00114 #define SCALEVLCBITS 8
00115 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
00116 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
00117 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
00118 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
00119 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
00120
00121 static VLC sf_vlc;
00122 static VLC sf_rl_vlc;
00123 static VLC vec4_vlc;
00124 static VLC vec2_vlc;
00125 static VLC vec1_vlc;
00126 static VLC coef_vlc[2];
00127 static float sin64[33];
00128
00132 typedef struct {
00133 int16_t prev_block_len;
00134 uint8_t transmit_coefs;
00135 uint8_t num_subframes;
00136 uint16_t subframe_len[MAX_SUBFRAMES];
00137 uint16_t subframe_offset[MAX_SUBFRAMES];
00138 uint8_t cur_subframe;
00139 uint16_t decoded_samples;
00140 uint8_t grouped;
00141 int quant_step;
00142 int8_t reuse_sf;
00143 int8_t scale_factor_step;
00144 int max_scale_factor;
00145 int saved_scale_factors[2][MAX_BANDS];
00146 int8_t scale_factor_idx;
00147 int* scale_factors;
00148 uint8_t table_idx;
00149 float* coeffs;
00150 uint16_t num_vec_coeffs;
00151 DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2];
00152 } WMAProChannelCtx;
00153
00157 typedef struct {
00158 uint8_t num_channels;
00159 int8_t transform;
00160 int8_t transform_band[MAX_BANDS];
00161 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
00162 float* channel_data[WMAPRO_MAX_CHANNELS];
00163 } WMAProChannelGrp;
00164
00168 typedef struct WMAProDecodeCtx {
00169
00170 AVCodecContext* avctx;
00171 AVFrame frame;
00172 DSPContext dsp;
00173 FmtConvertContext fmt_conv;
00174 uint8_t frame_data[MAX_FRAMESIZE +
00175 FF_INPUT_BUFFER_PADDING_SIZE];
00176 PutBitContext pb;
00177 FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES];
00178 DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE];
00179 float* windows[WMAPRO_BLOCK_SIZES];
00180
00181
00182 uint32_t decode_flags;
00183 uint8_t len_prefix;
00184 uint8_t dynamic_range_compression;
00185 uint8_t bits_per_sample;
00186 uint16_t samples_per_frame;
00187 uint16_t log2_frame_size;
00188 int8_t num_channels;
00189 int8_t lfe_channel;
00190 uint8_t max_num_subframes;
00191 uint8_t subframe_len_bits;
00192 uint8_t max_subframe_len_bit;
00193 uint16_t min_samples_per_subframe;
00194 int8_t num_sfb[WMAPRO_BLOCK_SIZES];
00195 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS];
00196 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS];
00197 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES];
00198
00199
00200 GetBitContext pgb;
00201 int next_packet_start;
00202 uint8_t packet_offset;
00203 uint8_t packet_sequence_number;
00204 int num_saved_bits;
00205 int frame_offset;
00206 int subframe_offset;
00207 uint8_t packet_loss;
00208 uint8_t packet_done;
00209
00210
00211 uint32_t frame_num;
00212 GetBitContext gb;
00213 int buf_bit_size;
00214 uint8_t drc_gain;
00215 int8_t skip_frame;
00216 int8_t parsed_all_subframes;
00217
00218
00219 int16_t subframe_len;
00220 int8_t channels_for_cur_subframe;
00221 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
00222 int8_t num_bands;
00223 int8_t transmit_num_vec_coeffs;
00224 int16_t* cur_sfb_offsets;
00225 uint8_t table_idx;
00226 int8_t esc_len;
00227
00228 uint8_t num_chgroups;
00229 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS];
00230
00231 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS];
00232 } WMAProDecodeCtx;
00233
00234
00239 static void av_cold dump_context(WMAProDecodeCtx *s)
00240 {
00241 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
00242 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b);
00243
00244 PRINT("ed sample bit depth", s->bits_per_sample);
00245 PRINT_HEX("ed decode flags", s->decode_flags);
00246 PRINT("samples per frame", s->samples_per_frame);
00247 PRINT("log2 frame size", s->log2_frame_size);
00248 PRINT("max num subframes", s->max_num_subframes);
00249 PRINT("len prefix", s->len_prefix);
00250 PRINT("num channels", s->num_channels);
00251 }
00252
00258 static av_cold int decode_end(AVCodecContext *avctx)
00259 {
00260 WMAProDecodeCtx *s = avctx->priv_data;
00261 int i;
00262
00263 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00264 ff_mdct_end(&s->mdct_ctx[i]);
00265
00266 return 0;
00267 }
00268
00274 static av_cold int decode_init(AVCodecContext *avctx)
00275 {
00276 WMAProDecodeCtx *s = avctx->priv_data;
00277 uint8_t *edata_ptr = avctx->extradata;
00278 unsigned int channel_mask;
00279 int i;
00280 int log2_max_num_subframes;
00281 int num_possible_block_sizes;
00282
00283 s->avctx = avctx;
00284 dsputil_init(&s->dsp, avctx);
00285 ff_fmt_convert_init(&s->fmt_conv, avctx);
00286 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
00287
00288 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
00289
00290 if (avctx->extradata_size >= 18) {
00291 s->decode_flags = AV_RL16(edata_ptr+14);
00292 channel_mask = AV_RL32(edata_ptr+2);
00293 s->bits_per_sample = AV_RL16(edata_ptr);
00295 for (i = 0; i < avctx->extradata_size; i++)
00296 av_dlog(avctx, "[%x] ", avctx->extradata[i]);
00297 av_dlog(avctx, "\n");
00298
00299 } else {
00300 av_log_ask_for_sample(avctx, "Unknown extradata size\n");
00301 return AVERROR_INVALIDDATA;
00302 }
00303
00305 s->log2_frame_size = av_log2(avctx->block_align) + 4;
00306
00308 s->skip_frame = 1;
00309 s->packet_loss = 1;
00310 s->len_prefix = (s->decode_flags & 0x40);
00311
00313 s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
00314 3, s->decode_flags);
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 || s->max_num_subframes == 4)
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
00335 if (s->num_channels < 0) {
00336 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
00337 return AVERROR_INVALIDDATA;
00338 } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
00339 av_log_ask_for_sample(avctx, "unsupported number of channels\n");
00340 return AVERROR_PATCHWELCOME;
00341 }
00342
00344 for (i = 0; i < s->num_channels; i++)
00345 s->channel[i].prev_block_len = s->samples_per_frame;
00346
00348 s->lfe_channel = -1;
00349
00350 if (channel_mask & 8) {
00351 unsigned int mask;
00352 for (mask = 1; mask < 16; mask <<= 1) {
00353 if (channel_mask & mask)
00354 ++s->lfe_channel;
00355 }
00356 }
00357
00358 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
00359 scale_huffbits, 1, 1,
00360 scale_huffcodes, 2, 2, 616);
00361
00362 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
00363 scale_rl_huffbits, 1, 1,
00364 scale_rl_huffcodes, 4, 4, 1406);
00365
00366 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
00367 coef0_huffbits, 1, 1,
00368 coef0_huffcodes, 4, 4, 2108);
00369
00370 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
00371 coef1_huffbits, 1, 1,
00372 coef1_huffcodes, 4, 4, 3912);
00373
00374 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
00375 vec4_huffbits, 1, 1,
00376 vec4_huffcodes, 2, 2, 604);
00377
00378 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
00379 vec2_huffbits, 1, 1,
00380 vec2_huffcodes, 2, 2, 562);
00381
00382 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
00383 vec1_huffbits, 1, 1,
00384 vec1_huffcodes, 2, 2, 562);
00385
00388 for (i = 0; i < num_possible_block_sizes; i++) {
00389 int subframe_len = s->samples_per_frame >> i;
00390 int x;
00391 int band = 1;
00392
00393 s->sfb_offsets[i][0] = 0;
00394
00395 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
00396 int offset = (subframe_len * 2 * critical_freq[x])
00397 / s->avctx->sample_rate + 2;
00398 offset &= ~3;
00399 if (offset > s->sfb_offsets[i][band - 1])
00400 s->sfb_offsets[i][band++] = offset;
00401 }
00402 s->sfb_offsets[i][band - 1] = subframe_len;
00403 s->num_sfb[i] = band - 1;
00404 }
00405
00406
00412 for (i = 0; i < num_possible_block_sizes; i++) {
00413 int b;
00414 for (b = 0; b < s->num_sfb[i]; b++) {
00415 int x;
00416 int offset = ((s->sfb_offsets[i][b]
00417 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
00418 for (x = 0; x < num_possible_block_sizes; x++) {
00419 int v = 0;
00420 while (s->sfb_offsets[x][v + 1] << x < offset)
00421 ++v;
00422 s->sf_offsets[i][x][b] = v;
00423 }
00424 }
00425 }
00426
00428 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00429 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
00430 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
00431 / (1 << (s->bits_per_sample - 1)));
00432
00434 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
00435 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
00436 ff_init_ff_sine_windows(win_idx);
00437 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
00438 }
00439
00441 for (i = 0; i < num_possible_block_sizes; i++) {
00442 int block_size = s->samples_per_frame >> i;
00443 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
00444 / s->avctx->sample_rate;
00445 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
00446 }
00447
00449 for (i = 0; i < 33; i++)
00450 sin64[i] = sin(i*M_PI / 64.0);
00451
00452 if (avctx->debug & FF_DEBUG_BITSTREAM)
00453 dump_context(s);
00454
00455 avctx->channel_layout = channel_mask;
00456
00457 avcodec_get_frame_defaults(&s->frame);
00458 avctx->coded_frame = &s->frame;
00459
00460 return 0;
00461 }
00462
00469 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
00470 {
00471 int frame_len_shift = 0;
00472 int subframe_len;
00473
00475 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
00476 return s->min_samples_per_subframe;
00477
00479 if (s->max_subframe_len_bit) {
00480 if (get_bits1(&s->gb))
00481 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
00482 } else
00483 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
00484
00485 subframe_len = s->samples_per_frame >> frame_len_shift;
00486
00488 if (subframe_len < s->min_samples_per_subframe ||
00489 subframe_len > s->samples_per_frame) {
00490 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
00491 subframe_len);
00492 return AVERROR_INVALIDDATA;
00493 }
00494 return subframe_len;
00495 }
00496
00517 static int decode_tilehdr(WMAProDecodeCtx *s)
00518 {
00519 uint16_t num_samples[WMAPRO_MAX_CHANNELS];
00520 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
00521 int channels_for_cur_subframe = s->num_channels;
00522 int fixed_channel_layout = 0;
00523 int min_channel_len = 0;
00524 int c;
00525
00526
00527
00528
00529
00530
00531
00533 for (c = 0; c < s->num_channels; c++)
00534 s->channel[c].num_subframes = 0;
00535
00536 memset(num_samples, 0, sizeof(num_samples));
00537
00538 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
00539 fixed_channel_layout = 1;
00540
00542 do {
00543 int subframe_len;
00544
00546 for (c = 0; c < s->num_channels; c++) {
00547 if (num_samples[c] == min_channel_len) {
00548 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
00549 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
00550 contains_subframe[c] = 1;
00551 else
00552 contains_subframe[c] = get_bits1(&s->gb);
00553 } else
00554 contains_subframe[c] = 0;
00555 }
00556
00558 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
00559 return AVERROR_INVALIDDATA;
00560
00562 min_channel_len += subframe_len;
00563 for (c = 0; c < s->num_channels; c++) {
00564 WMAProChannelCtx* chan = &s->channel[c];
00565
00566 if (contains_subframe[c]) {
00567 if (chan->num_subframes >= MAX_SUBFRAMES) {
00568 av_log(s->avctx, AV_LOG_ERROR,
00569 "broken frame: num subframes > 31\n");
00570 return AVERROR_INVALIDDATA;
00571 }
00572 chan->subframe_len[chan->num_subframes] = subframe_len;
00573 num_samples[c] += subframe_len;
00574 ++chan->num_subframes;
00575 if (num_samples[c] > s->samples_per_frame) {
00576 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
00577 "channel len > samples_per_frame\n");
00578 return AVERROR_INVALIDDATA;
00579 }
00580 } else if (num_samples[c] <= min_channel_len) {
00581 if (num_samples[c] < min_channel_len) {
00582 channels_for_cur_subframe = 0;
00583 min_channel_len = num_samples[c];
00584 }
00585 ++channels_for_cur_subframe;
00586 }
00587 }
00588 } while (min_channel_len < s->samples_per_frame);
00589
00590 for (c = 0; c < s->num_channels; c++) {
00591 int i;
00592 int offset = 0;
00593 for (i = 0; i < s->channel[c].num_subframes; i++) {
00594 av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
00595 " len %i\n", s->frame_num, c, i,
00596 s->channel[c].subframe_len[i]);
00597 s->channel[c].subframe_offset[i] = offset;
00598 offset += s->channel[c].subframe_len[i];
00599 }
00600 }
00601
00602 return 0;
00603 }
00604
00610 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
00611 WMAProChannelGrp *chgroup)
00612 {
00613 int i;
00614 int offset = 0;
00615 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
00616 memset(chgroup->decorrelation_matrix, 0, s->num_channels *
00617 s->num_channels * sizeof(*chgroup->decorrelation_matrix));
00618
00619 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
00620 rotation_offset[i] = get_bits(&s->gb, 6);
00621
00622 for (i = 0; i < chgroup->num_channels; i++)
00623 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
00624 get_bits1(&s->gb) ? 1.0 : -1.0;
00625
00626 for (i = 1; i < chgroup->num_channels; i++) {
00627 int x;
00628 for (x = 0; x < i; x++) {
00629 int y;
00630 for (y = 0; y < i + 1; y++) {
00631 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
00632 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
00633 int n = rotation_offset[offset + x];
00634 float sinv;
00635 float cosv;
00636
00637 if (n < 32) {
00638 sinv = sin64[n];
00639 cosv = sin64[32 - n];
00640 } else {
00641 sinv = sin64[64 - n];
00642 cosv = -sin64[n - 32];
00643 }
00644
00645 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
00646 (v1 * sinv) - (v2 * cosv);
00647 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
00648 (v1 * cosv) + (v2 * sinv);
00649 }
00650 }
00651 offset += i;
00652 }
00653 }
00654
00660 static int decode_channel_transform(WMAProDecodeCtx* s)
00661 {
00662 int i;
00663
00664
00665
00666
00667
00669 s->num_chgroups = 0;
00670 if (s->num_channels > 1) {
00671 int remaining_channels = s->channels_for_cur_subframe;
00672
00673 if (get_bits1(&s->gb)) {
00674 av_log_ask_for_sample(s->avctx,
00675 "unsupported channel transform bit\n");
00676 return AVERROR_INVALIDDATA;
00677 }
00678
00679 for (s->num_chgroups = 0; remaining_channels &&
00680 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
00681 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
00682 float** channel_data = chgroup->channel_data;
00683 chgroup->num_channels = 0;
00684 chgroup->transform = 0;
00685
00687 if (remaining_channels > 2) {
00688 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00689 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00690 if (!s->channel[channel_idx].grouped
00691 && get_bits1(&s->gb)) {
00692 ++chgroup->num_channels;
00693 s->channel[channel_idx].grouped = 1;
00694 *channel_data++ = s->channel[channel_idx].coeffs;
00695 }
00696 }
00697 } else {
00698 chgroup->num_channels = remaining_channels;
00699 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00700 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00701 if (!s->channel[channel_idx].grouped)
00702 *channel_data++ = s->channel[channel_idx].coeffs;
00703 s->channel[channel_idx].grouped = 1;
00704 }
00705 }
00706
00708 if (chgroup->num_channels == 2) {
00709 if (get_bits1(&s->gb)) {
00710 if (get_bits1(&s->gb)) {
00711 av_log_ask_for_sample(s->avctx,
00712 "unsupported channel transform type\n");
00713 }
00714 } else {
00715 chgroup->transform = 1;
00716 if (s->num_channels == 2) {
00717 chgroup->decorrelation_matrix[0] = 1.0;
00718 chgroup->decorrelation_matrix[1] = -1.0;
00719 chgroup->decorrelation_matrix[2] = 1.0;
00720 chgroup->decorrelation_matrix[3] = 1.0;
00721 } else {
00723 chgroup->decorrelation_matrix[0] = 0.70703125;
00724 chgroup->decorrelation_matrix[1] = -0.70703125;
00725 chgroup->decorrelation_matrix[2] = 0.70703125;
00726 chgroup->decorrelation_matrix[3] = 0.70703125;
00727 }
00728 }
00729 } else if (chgroup->num_channels > 2) {
00730 if (get_bits1(&s->gb)) {
00731 chgroup->transform = 1;
00732 if (get_bits1(&s->gb)) {
00733 decode_decorrelation_matrix(s, chgroup);
00734 } else {
00736 if (chgroup->num_channels > 6) {
00737 av_log_ask_for_sample(s->avctx,
00738 "coupled channels > 6\n");
00739 } else {
00740 memcpy(chgroup->decorrelation_matrix,
00741 default_decorrelation[chgroup->num_channels],
00742 chgroup->num_channels * chgroup->num_channels *
00743 sizeof(*chgroup->decorrelation_matrix));
00744 }
00745 }
00746 }
00747 }
00748
00750 if (chgroup->transform) {
00751 if (!get_bits1(&s->gb)) {
00752 int i;
00754 for (i = 0; i < s->num_bands; i++) {
00755 chgroup->transform_band[i] = get_bits1(&s->gb);
00756 }
00757 } else {
00758 memset(chgroup->transform_band, 1, s->num_bands);
00759 }
00760 }
00761 remaining_channels -= chgroup->num_channels;
00762 }
00763 }
00764 return 0;
00765 }
00766
00773 static int decode_coeffs(WMAProDecodeCtx *s, int c)
00774 {
00775
00776
00777
00778 static const uint32_t fval_tab[16] = {
00779 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
00780 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
00781 0x41000000, 0x41100000, 0x41200000, 0x41300000,
00782 0x41400000, 0x41500000, 0x41600000, 0x41700000,
00783 };
00784 int vlctable;
00785 VLC* vlc;
00786 WMAProChannelCtx* ci = &s->channel[c];
00787 int rl_mode = 0;
00788 int cur_coeff = 0;
00789 int num_zeros = 0;
00790 const uint16_t* run;
00791 const float* level;
00792
00793 av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
00794
00795 vlctable = get_bits1(&s->gb);
00796 vlc = &coef_vlc[vlctable];
00797
00798 if (vlctable) {
00799 run = coef1_run;
00800 level = coef1_level;
00801 } else {
00802 run = coef0_run;
00803 level = coef0_level;
00804 }
00805
00808 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
00809 (cur_coeff + 3 < ci->num_vec_coeffs)) {
00810 uint32_t vals[4];
00811 int i;
00812 unsigned int idx;
00813
00814 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
00815
00816 if (idx == HUFF_VEC4_SIZE - 1) {
00817 for (i = 0; i < 4; i += 2) {
00818 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
00819 if (idx == HUFF_VEC2_SIZE - 1) {
00820 uint32_t v0, v1;
00821 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00822 if (v0 == HUFF_VEC1_SIZE - 1)
00823 v0 += ff_wma_get_large_val(&s->gb);
00824 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00825 if (v1 == HUFF_VEC1_SIZE - 1)
00826 v1 += ff_wma_get_large_val(&s->gb);
00827 vals[i ] = av_float2int(v0);
00828 vals[i+1] = av_float2int(v1);
00829 } else {
00830 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
00831 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
00832 }
00833 }
00834 } else {
00835 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
00836 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
00837 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
00838 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
00839 }
00840
00842 for (i = 0; i < 4; i++) {
00843 if (vals[i]) {
00844 uint32_t sign = get_bits1(&s->gb) - 1;
00845 AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
00846 num_zeros = 0;
00847 } else {
00848 ci->coeffs[cur_coeff] = 0;
00851 rl_mode |= (++num_zeros > s->subframe_len >> 8);
00852 }
00853 ++cur_coeff;
00854 }
00855 }
00856
00858 if (cur_coeff < s->subframe_len) {
00859 memset(&ci->coeffs[cur_coeff], 0,
00860 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
00861 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
00862 level, run, 1, ci->coeffs,
00863 cur_coeff, s->subframe_len,
00864 s->subframe_len, s->esc_len, 0))
00865 return AVERROR_INVALIDDATA;
00866 }
00867
00868 return 0;
00869 }
00870
00876 static int decode_scale_factors(WMAProDecodeCtx* s)
00877 {
00878 int i;
00879
00884 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00885 int c = s->channel_indexes_for_cur_subframe[i];
00886 int* sf;
00887 int* sf_end;
00888 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
00889 sf_end = s->channel[c].scale_factors + s->num_bands;
00890
00896 if (s->channel[c].reuse_sf) {
00897 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
00898 int b;
00899 for (b = 0; b < s->num_bands; b++)
00900 s->channel[c].scale_factors[b] =
00901 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
00902 }
00903
00904 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
00905
00906 if (!s->channel[c].reuse_sf) {
00907 int val;
00909 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
00910 val = 45 / s->channel[c].scale_factor_step;
00911 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
00912 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
00913 *sf = val;
00914 }
00915 } else {
00916 int i;
00918 for (i = 0; i < s->num_bands; i++) {
00919 int idx;
00920 int skip;
00921 int val;
00922 int sign;
00923
00924 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
00925
00926 if (!idx) {
00927 uint32_t code = get_bits(&s->gb, 14);
00928 val = code >> 6;
00929 sign = (code & 1) - 1;
00930 skip = (code & 0x3f) >> 1;
00931 } else if (idx == 1) {
00932 break;
00933 } else {
00934 skip = scale_rl_run[idx];
00935 val = scale_rl_level[idx];
00936 sign = get_bits1(&s->gb)-1;
00937 }
00938
00939 i += skip;
00940 if (i >= s->num_bands) {
00941 av_log(s->avctx, AV_LOG_ERROR,
00942 "invalid scale factor coding\n");
00943 return AVERROR_INVALIDDATA;
00944 }
00945 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
00946 }
00947 }
00949 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
00950 s->channel[c].table_idx = s->table_idx;
00951 s->channel[c].reuse_sf = 1;
00952 }
00953
00955 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
00956 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
00957 s->channel[c].max_scale_factor =
00958 FFMAX(s->channel[c].max_scale_factor, *sf);
00959 }
00960
00961 }
00962 return 0;
00963 }
00964
00969 static void inverse_channel_transform(WMAProDecodeCtx *s)
00970 {
00971 int i;
00972
00973 for (i = 0; i < s->num_chgroups; i++) {
00974 if (s->chgroup[i].transform) {
00975 float data[WMAPRO_MAX_CHANNELS];
00976 const int num_channels = s->chgroup[i].num_channels;
00977 float** ch_data = s->chgroup[i].channel_data;
00978 float** ch_end = ch_data + num_channels;
00979 const int8_t* tb = s->chgroup[i].transform_band;
00980 int16_t* sfb;
00981
00983 for (sfb = s->cur_sfb_offsets;
00984 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
00985 int y;
00986 if (*tb++ == 1) {
00988 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
00989 const float* mat = s->chgroup[i].decorrelation_matrix;
00990 const float* data_end = data + num_channels;
00991 float* data_ptr = data;
00992 float** ch;
00993
00994 for (ch = ch_data; ch < ch_end; ch++)
00995 *data_ptr++ = (*ch)[y];
00996
00997 for (ch = ch_data; ch < ch_end; ch++) {
00998 float sum = 0;
00999 data_ptr = data;
01000 while (data_ptr < data_end)
01001 sum += *data_ptr++ * *mat++;
01002
01003 (*ch)[y] = sum;
01004 }
01005 }
01006 } else if (s->num_channels == 2) {
01007 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
01008 s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
01009 ch_data[0] + sfb[0],
01010 181.0 / 128, len);
01011 s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
01012 ch_data[1] + sfb[0],
01013 181.0 / 128, len);
01014 }
01015 }
01016 }
01017 }
01018 }
01019
01024 static void wmapro_window(WMAProDecodeCtx *s)
01025 {
01026 int i;
01027 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01028 int c = s->channel_indexes_for_cur_subframe[i];
01029 float* window;
01030 int winlen = s->channel[c].prev_block_len;
01031 float* start = s->channel[c].coeffs - (winlen >> 1);
01032
01033 if (s->subframe_len < winlen) {
01034 start += (winlen - s->subframe_len) >> 1;
01035 winlen = s->subframe_len;
01036 }
01037
01038 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
01039
01040 winlen >>= 1;
01041
01042 s->dsp.vector_fmul_window(start, start, start + winlen,
01043 window, winlen);
01044
01045 s->channel[c].prev_block_len = s->subframe_len;
01046 }
01047 }
01048
01054 static int decode_subframe(WMAProDecodeCtx *s)
01055 {
01056 int offset = s->samples_per_frame;
01057 int subframe_len = s->samples_per_frame;
01058 int i;
01059 int total_samples = s->samples_per_frame * s->num_channels;
01060 int transmit_coeffs = 0;
01061 int cur_subwoofer_cutoff;
01062
01063 s->subframe_offset = get_bits_count(&s->gb);
01064
01069 for (i = 0; i < s->num_channels; i++) {
01070 s->channel[i].grouped = 0;
01071 if (offset > s->channel[i].decoded_samples) {
01072 offset = s->channel[i].decoded_samples;
01073 subframe_len =
01074 s->channel[i].subframe_len[s->channel[i].cur_subframe];
01075 }
01076 }
01077
01078 av_dlog(s->avctx,
01079 "processing subframe with offset %i len %i\n", offset, subframe_len);
01080
01082 s->channels_for_cur_subframe = 0;
01083 for (i = 0; i < s->num_channels; i++) {
01084 const int cur_subframe = s->channel[i].cur_subframe;
01086 total_samples -= s->channel[i].decoded_samples;
01087
01089 if (offset == s->channel[i].decoded_samples &&
01090 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
01091 total_samples -= s->channel[i].subframe_len[cur_subframe];
01092 s->channel[i].decoded_samples +=
01093 s->channel[i].subframe_len[cur_subframe];
01094 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
01095 ++s->channels_for_cur_subframe;
01096 }
01097 }
01098
01101 if (!total_samples)
01102 s->parsed_all_subframes = 1;
01103
01104
01105 av_dlog(s->avctx, "subframe is part of %i channels\n",
01106 s->channels_for_cur_subframe);
01107
01109 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
01110 s->num_bands = s->num_sfb[s->table_idx];
01111 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
01112 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
01113
01115 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01116 int c = s->channel_indexes_for_cur_subframe[i];
01117
01118 s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
01119 + offset];
01120 }
01121
01122 s->subframe_len = subframe_len;
01123 s->esc_len = av_log2(s->subframe_len - 1) + 1;
01124
01126 if (get_bits1(&s->gb)) {
01127 int num_fill_bits;
01128 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
01129 int len = get_bits(&s->gb, 4);
01130 num_fill_bits = get_bits(&s->gb, len) + 1;
01131 }
01132
01133 if (num_fill_bits >= 0) {
01134 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
01135 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
01136 return AVERROR_INVALIDDATA;
01137 }
01138
01139 skip_bits_long(&s->gb, num_fill_bits);
01140 }
01141 }
01142
01144 if (get_bits1(&s->gb)) {
01145 av_log_ask_for_sample(s->avctx, "reserved bit set\n");
01146 return AVERROR_INVALIDDATA;
01147 }
01148
01149
01150 if (decode_channel_transform(s) < 0)
01151 return AVERROR_INVALIDDATA;
01152
01153
01154 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01155 int c = s->channel_indexes_for_cur_subframe[i];
01156 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
01157 transmit_coeffs = 1;
01158 }
01159
01160 if (transmit_coeffs) {
01161 int step;
01162 int quant_step = 90 * s->bits_per_sample >> 4;
01163
01165 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
01166 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
01167 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01168 int c = s->channel_indexes_for_cur_subframe[i];
01169 s->channel[c].num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
01170 }
01171 } else {
01172 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01173 int c = s->channel_indexes_for_cur_subframe[i];
01174 s->channel[c].num_vec_coeffs = s->subframe_len;
01175 }
01176 }
01178 step = get_sbits(&s->gb, 6);
01179 quant_step += step;
01180 if (step == -32 || step == 31) {
01181 const int sign = (step == 31) - 1;
01182 int quant = 0;
01183 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
01184 (step = get_bits(&s->gb, 5)) == 31) {
01185 quant += 31;
01186 }
01187 quant_step += ((quant + step) ^ sign) - sign;
01188 }
01189 if (quant_step < 0) {
01190 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
01191 }
01192
01195 if (s->channels_for_cur_subframe == 1) {
01196 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
01197 } else {
01198 int modifier_len = get_bits(&s->gb, 3);
01199 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01200 int c = s->channel_indexes_for_cur_subframe[i];
01201 s->channel[c].quant_step = quant_step;
01202 if (get_bits1(&s->gb)) {
01203 if (modifier_len) {
01204 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
01205 } else
01206 ++s->channel[c].quant_step;
01207 }
01208 }
01209 }
01210
01212 if (decode_scale_factors(s) < 0)
01213 return AVERROR_INVALIDDATA;
01214 }
01215
01216 av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
01217 get_bits_count(&s->gb) - s->subframe_offset);
01218
01220 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01221 int c = s->channel_indexes_for_cur_subframe[i];
01222 if (s->channel[c].transmit_coefs &&
01223 get_bits_count(&s->gb) < s->num_saved_bits) {
01224 decode_coeffs(s, c);
01225 } else
01226 memset(s->channel[c].coeffs, 0,
01227 sizeof(*s->channel[c].coeffs) * subframe_len);
01228 }
01229
01230 av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
01231 get_bits_count(&s->gb) - s->subframe_offset);
01232
01233 if (transmit_coeffs) {
01234 FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
01236 inverse_channel_transform(s);
01237 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01238 int c = s->channel_indexes_for_cur_subframe[i];
01239 const int* sf = s->channel[c].scale_factors;
01240 int b;
01241
01242 if (c == s->lfe_channel)
01243 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
01244 (subframe_len - cur_subwoofer_cutoff));
01245
01247 for (b = 0; b < s->num_bands; b++) {
01248 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
01249 const int exp = s->channel[c].quant_step -
01250 (s->channel[c].max_scale_factor - *sf++) *
01251 s->channel[c].scale_factor_step;
01252 const float quant = pow(10.0, exp / 20.0);
01253 int start = s->cur_sfb_offsets[b];
01254 s->dsp.vector_fmul_scalar(s->tmp + start,
01255 s->channel[c].coeffs + start,
01256 quant, end - start);
01257 }
01258
01260 mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
01261 }
01262 }
01263
01265 wmapro_window(s);
01266
01268 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01269 int c = s->channel_indexes_for_cur_subframe[i];
01270 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
01271 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
01272 return AVERROR_INVALIDDATA;
01273 }
01274 ++s->channel[c].cur_subframe;
01275 }
01276
01277 return 0;
01278 }
01279
01286 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
01287 {
01288 AVCodecContext *avctx = s->avctx;
01289 GetBitContext* gb = &s->gb;
01290 int more_frames = 0;
01291 int len = 0;
01292 int i, ret;
01293 const float *out_ptr[WMAPRO_MAX_CHANNELS];
01294 float *samples;
01295
01297 if (s->len_prefix)
01298 len = get_bits(gb, s->log2_frame_size);
01299
01300 av_dlog(s->avctx, "decoding frame with length %x\n", len);
01301
01303 if (decode_tilehdr(s)) {
01304 s->packet_loss = 1;
01305 return 0;
01306 }
01307
01309 if (s->num_channels > 1 && get_bits1(gb)) {
01310 if (get_bits1(gb)) {
01311 for (i = 0; i < s->num_channels * s->num_channels; i++)
01312 skip_bits(gb, 4);
01313 }
01314 }
01315
01317 if (s->dynamic_range_compression) {
01318 s->drc_gain = get_bits(gb, 8);
01319 av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
01320 }
01321
01324 if (get_bits1(gb)) {
01325 int av_unused skip;
01326
01328 if (get_bits1(gb)) {
01329 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01330 av_dlog(s->avctx, "start skip: %i\n", skip);
01331 }
01332
01334 if (get_bits1(gb)) {
01335 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01336 av_dlog(s->avctx, "end skip: %i\n", skip);
01337 }
01338
01339 }
01340
01341 av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
01342 get_bits_count(gb) - s->frame_offset);
01343
01345 s->parsed_all_subframes = 0;
01346 for (i = 0; i < s->num_channels; i++) {
01347 s->channel[i].decoded_samples = 0;
01348 s->channel[i].cur_subframe = 0;
01349 s->channel[i].reuse_sf = 0;
01350 }
01351
01353 while (!s->parsed_all_subframes) {
01354 if (decode_subframe(s) < 0) {
01355 s->packet_loss = 1;
01356 return 0;
01357 }
01358 }
01359
01360
01361 s->frame.nb_samples = s->samples_per_frame;
01362 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
01363 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01364 s->packet_loss = 1;
01365 return 0;
01366 }
01367 samples = (float *)s->frame.data[0];
01368
01370 for (i = 0; i < s->num_channels; i++)
01371 out_ptr[i] = s->channel[i].out;
01372 s->fmt_conv.float_interleave(samples, out_ptr, s->samples_per_frame,
01373 s->num_channels);
01374
01375 for (i = 0; i < s->num_channels; i++) {
01377 memcpy(&s->channel[i].out[0],
01378 &s->channel[i].out[s->samples_per_frame],
01379 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
01380 }
01381
01382 if (s->skip_frame) {
01383 s->skip_frame = 0;
01384 *got_frame_ptr = 0;
01385 } else {
01386 *got_frame_ptr = 1;
01387 }
01388
01389 if (s->len_prefix) {
01390 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
01392 av_log(s->avctx, AV_LOG_ERROR,
01393 "frame[%i] would have to skip %i bits\n", s->frame_num,
01394 len - (get_bits_count(gb) - s->frame_offset) - 1);
01395 s->packet_loss = 1;
01396 return 0;
01397 }
01398
01400 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
01401 } else {
01402 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
01403 }
01404 }
01405
01407 more_frames = get_bits1(gb);
01408
01409 ++s->frame_num;
01410 return more_frames;
01411 }
01412
01419 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
01420 {
01421 return s->buf_bit_size - get_bits_count(gb);
01422 }
01423
01431 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
01432 int append)
01433 {
01434 int buflen;
01435
01440 if (!append) {
01441 s->frame_offset = get_bits_count(gb) & 7;
01442 s->num_saved_bits = s->frame_offset;
01443 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
01444 }
01445
01446 buflen = (put_bits_count(&s->pb) + len + 8) >> 3;
01447
01448 if (len <= 0 || buflen > MAX_FRAMESIZE) {
01449 av_log_ask_for_sample(s->avctx, "input buffer too small\n");
01450 s->packet_loss = 1;
01451 return;
01452 }
01453
01454 s->num_saved_bits += len;
01455 if (!append) {
01456 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
01457 s->num_saved_bits);
01458 } else {
01459 int align = 8 - (get_bits_count(gb) & 7);
01460 align = FFMIN(align, len);
01461 put_bits(&s->pb, align, get_bits(gb, align));
01462 len -= align;
01463 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
01464 }
01465 skip_bits_long(gb, len);
01466
01467 {
01468 PutBitContext tmp = s->pb;
01469 flush_put_bits(&tmp);
01470 }
01471
01472 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
01473 skip_bits(&s->gb, s->frame_offset);
01474 }
01475
01484 static int decode_packet(AVCodecContext *avctx, void *data,
01485 int *got_frame_ptr, AVPacket* avpkt)
01486 {
01487 WMAProDecodeCtx *s = avctx->priv_data;
01488 GetBitContext* gb = &s->pgb;
01489 const uint8_t* buf = avpkt->data;
01490 int buf_size = avpkt->size;
01491 int num_bits_prev_frame;
01492 int packet_sequence_number;
01493
01494 *got_frame_ptr = 0;
01495
01496 if (s->packet_done || s->packet_loss) {
01497 s->packet_done = 0;
01498
01500 if (buf_size < avctx->block_align)
01501 return 0;
01502
01503 s->next_packet_start = buf_size - avctx->block_align;
01504 buf_size = avctx->block_align;
01505 s->buf_bit_size = buf_size << 3;
01506
01508 init_get_bits(gb, buf, s->buf_bit_size);
01509 packet_sequence_number = get_bits(gb, 4);
01510 skip_bits(gb, 2);
01511
01513 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
01514 av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
01515 num_bits_prev_frame);
01516
01518 if (!s->packet_loss &&
01519 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
01520 s->packet_loss = 1;
01521 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
01522 s->packet_sequence_number, packet_sequence_number);
01523 }
01524 s->packet_sequence_number = packet_sequence_number;
01525
01526 if (num_bits_prev_frame > 0) {
01527 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
01528 if (num_bits_prev_frame >= remaining_packet_bits) {
01529 num_bits_prev_frame = remaining_packet_bits;
01530 s->packet_done = 1;
01531 }
01532
01535 save_bits(s, gb, num_bits_prev_frame, 1);
01536 av_dlog(avctx, "accumulated %x bits of frame data\n",
01537 s->num_saved_bits - s->frame_offset);
01538
01540 if (!s->packet_loss)
01541 decode_frame(s, got_frame_ptr);
01542 } else if (s->num_saved_bits - s->frame_offset) {
01543 av_dlog(avctx, "ignoring %x previously saved bits\n",
01544 s->num_saved_bits - s->frame_offset);
01545 }
01546
01547 if (s->packet_loss) {
01551 s->num_saved_bits = 0;
01552 s->packet_loss = 0;
01553 }
01554
01555 } else {
01556 int frame_size;
01557 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
01558 init_get_bits(gb, avpkt->data, s->buf_bit_size);
01559 skip_bits(gb, s->packet_offset);
01560 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
01561 (frame_size = show_bits(gb, s->log2_frame_size)) &&
01562 frame_size <= remaining_bits(s, gb)) {
01563 save_bits(s, gb, frame_size, 0);
01564 s->packet_done = !decode_frame(s, got_frame_ptr);
01565 } else if (!s->len_prefix
01566 && s->num_saved_bits > get_bits_count(&s->gb)) {
01574 s->packet_done = !decode_frame(s, got_frame_ptr);
01575 } else
01576 s->packet_done = 1;
01577 }
01578
01579 if (s->packet_done && !s->packet_loss &&
01580 remaining_bits(s, gb) > 0) {
01583 save_bits(s, gb, remaining_bits(s, gb), 0);
01584 }
01585
01586 s->packet_offset = get_bits_count(gb) & 7;
01587 if (s->packet_loss)
01588 return AVERROR_INVALIDDATA;
01589
01590 if (*got_frame_ptr)
01591 *(AVFrame *)data = s->frame;
01592
01593 return get_bits_count(gb) >> 3;
01594 }
01595
01600 static void flush(AVCodecContext *avctx)
01601 {
01602 WMAProDecodeCtx *s = avctx->priv_data;
01603 int i;
01606 for (i = 0; i < s->num_channels; i++)
01607 memset(s->channel[i].out, 0, s->samples_per_frame *
01608 sizeof(*s->channel[i].out));
01609 s->packet_loss = 1;
01610 }
01611
01612
01616 AVCodec ff_wmapro_decoder = {
01617 .name = "wmapro",
01618 .type = AVMEDIA_TYPE_AUDIO,
01619 .id = CODEC_ID_WMAPRO,
01620 .priv_data_size = sizeof(WMAProDecodeCtx),
01621 .init = decode_init,
01622 .close = decode_end,
01623 .decode = decode_packet,
01624 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
01625 .flush= flush,
01626 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
01627 };