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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 if (!avctx->block_align) {
00284 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
00285 return AVERROR(EINVAL);
00286 }
00287
00288 s->avctx = avctx;
00289 dsputil_init(&s->dsp, avctx);
00290 ff_fmt_convert_init(&s->fmt_conv, avctx);
00291 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
00292
00293 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
00294
00295 if (avctx->extradata_size >= 18) {
00296 s->decode_flags = AV_RL16(edata_ptr+14);
00297 channel_mask = AV_RL32(edata_ptr+2);
00298 s->bits_per_sample = AV_RL16(edata_ptr);
00300 for (i = 0; i < avctx->extradata_size; i++)
00301 av_dlog(avctx, "[%x] ", avctx->extradata[i]);
00302 av_dlog(avctx, "\n");
00303
00304 } else {
00305 av_log_ask_for_sample(avctx, "Unknown extradata size\n");
00306 return AVERROR_INVALIDDATA;
00307 }
00308
00310 s->log2_frame_size = av_log2(avctx->block_align) + 4;
00311
00313 s->skip_frame = 1;
00314 s->packet_loss = 1;
00315 s->len_prefix = (s->decode_flags & 0x40);
00316
00318 s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
00319 3, s->decode_flags);
00320
00322 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
00323 s->max_num_subframes = 1 << log2_max_num_subframes;
00324 if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
00325 s->max_subframe_len_bit = 1;
00326 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
00327
00328 num_possible_block_sizes = log2_max_num_subframes + 1;
00329 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
00330 s->dynamic_range_compression = (s->decode_flags & 0x80);
00331
00332 if (s->max_num_subframes > MAX_SUBFRAMES) {
00333 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
00334 s->max_num_subframes);
00335 return AVERROR_INVALIDDATA;
00336 }
00337
00338 if (s->avctx->sample_rate <= 0) {
00339 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
00340 return AVERROR_INVALIDDATA;
00341 }
00342
00343 s->num_channels = avctx->channels;
00344
00345 if (s->num_channels < 0) {
00346 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
00347 return AVERROR_INVALIDDATA;
00348 } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
00349 av_log_ask_for_sample(avctx, "unsupported number of channels\n");
00350 return AVERROR_PATCHWELCOME;
00351 }
00352
00354 for (i = 0; i < s->num_channels; i++)
00355 s->channel[i].prev_block_len = s->samples_per_frame;
00356
00358 s->lfe_channel = -1;
00359
00360 if (channel_mask & 8) {
00361 unsigned int mask;
00362 for (mask = 1; mask < 16; mask <<= 1) {
00363 if (channel_mask & mask)
00364 ++s->lfe_channel;
00365 }
00366 }
00367
00368 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
00369 scale_huffbits, 1, 1,
00370 scale_huffcodes, 2, 2, 616);
00371
00372 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
00373 scale_rl_huffbits, 1, 1,
00374 scale_rl_huffcodes, 4, 4, 1406);
00375
00376 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
00377 coef0_huffbits, 1, 1,
00378 coef0_huffcodes, 4, 4, 2108);
00379
00380 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
00381 coef1_huffbits, 1, 1,
00382 coef1_huffcodes, 4, 4, 3912);
00383
00384 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
00385 vec4_huffbits, 1, 1,
00386 vec4_huffcodes, 2, 2, 604);
00387
00388 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
00389 vec2_huffbits, 1, 1,
00390 vec2_huffcodes, 2, 2, 562);
00391
00392 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
00393 vec1_huffbits, 1, 1,
00394 vec1_huffcodes, 2, 2, 562);
00395
00398 for (i = 0; i < num_possible_block_sizes; i++) {
00399 int subframe_len = s->samples_per_frame >> i;
00400 int x;
00401 int band = 1;
00402
00403 s->sfb_offsets[i][0] = 0;
00404
00405 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
00406 int offset = (subframe_len * 2 * critical_freq[x])
00407 / s->avctx->sample_rate + 2;
00408 offset &= ~3;
00409 if (offset > s->sfb_offsets[i][band - 1])
00410 s->sfb_offsets[i][band++] = offset;
00411 }
00412 s->sfb_offsets[i][band - 1] = subframe_len;
00413 s->num_sfb[i] = band - 1;
00414 }
00415
00416
00422 for (i = 0; i < num_possible_block_sizes; i++) {
00423 int b;
00424 for (b = 0; b < s->num_sfb[i]; b++) {
00425 int x;
00426 int offset = ((s->sfb_offsets[i][b]
00427 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
00428 for (x = 0; x < num_possible_block_sizes; x++) {
00429 int v = 0;
00430 while (s->sfb_offsets[x][v + 1] << x < offset)
00431 ++v;
00432 s->sf_offsets[i][x][b] = v;
00433 }
00434 }
00435 }
00436
00438 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00439 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
00440 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
00441 / (1 << (s->bits_per_sample - 1)));
00442
00444 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
00445 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
00446 ff_init_ff_sine_windows(win_idx);
00447 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
00448 }
00449
00451 for (i = 0; i < num_possible_block_sizes; i++) {
00452 int block_size = s->samples_per_frame >> i;
00453 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
00454 / s->avctx->sample_rate;
00455 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
00456 }
00457
00459 for (i = 0; i < 33; i++)
00460 sin64[i] = sin(i*M_PI / 64.0);
00461
00462 if (avctx->debug & FF_DEBUG_BITSTREAM)
00463 dump_context(s);
00464
00465 avctx->channel_layout = channel_mask;
00466
00467 avcodec_get_frame_defaults(&s->frame);
00468 avctx->coded_frame = &s->frame;
00469
00470 return 0;
00471 }
00472
00479 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
00480 {
00481 int frame_len_shift = 0;
00482 int subframe_len;
00483
00485 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
00486 return s->min_samples_per_subframe;
00487
00489 if (s->max_subframe_len_bit) {
00490 if (get_bits1(&s->gb))
00491 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
00492 } else
00493 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
00494
00495 subframe_len = s->samples_per_frame >> frame_len_shift;
00496
00498 if (subframe_len < s->min_samples_per_subframe ||
00499 subframe_len > s->samples_per_frame) {
00500 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
00501 subframe_len);
00502 return AVERROR_INVALIDDATA;
00503 }
00504 return subframe_len;
00505 }
00506
00527 static int decode_tilehdr(WMAProDecodeCtx *s)
00528 {
00529 uint16_t num_samples[WMAPRO_MAX_CHANNELS];
00530 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
00531 int channels_for_cur_subframe = s->num_channels;
00532 int fixed_channel_layout = 0;
00533 int min_channel_len = 0;
00534 int c;
00535
00536
00537
00538
00539
00540
00541
00543 for (c = 0; c < s->num_channels; c++)
00544 s->channel[c].num_subframes = 0;
00545
00546 memset(num_samples, 0, sizeof(num_samples));
00547
00548 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
00549 fixed_channel_layout = 1;
00550
00552 do {
00553 int subframe_len;
00554
00556 for (c = 0; c < s->num_channels; c++) {
00557 if (num_samples[c] == min_channel_len) {
00558 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
00559 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
00560 contains_subframe[c] = 1;
00561 else
00562 contains_subframe[c] = get_bits1(&s->gb);
00563 } else
00564 contains_subframe[c] = 0;
00565 }
00566
00568 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
00569 return AVERROR_INVALIDDATA;
00570
00572 min_channel_len += subframe_len;
00573 for (c = 0; c < s->num_channels; c++) {
00574 WMAProChannelCtx* chan = &s->channel[c];
00575
00576 if (contains_subframe[c]) {
00577 if (chan->num_subframes >= MAX_SUBFRAMES) {
00578 av_log(s->avctx, AV_LOG_ERROR,
00579 "broken frame: num subframes > 31\n");
00580 return AVERROR_INVALIDDATA;
00581 }
00582 chan->subframe_len[chan->num_subframes] = subframe_len;
00583 num_samples[c] += subframe_len;
00584 ++chan->num_subframes;
00585 if (num_samples[c] > s->samples_per_frame) {
00586 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
00587 "channel len > samples_per_frame\n");
00588 return AVERROR_INVALIDDATA;
00589 }
00590 } else if (num_samples[c] <= min_channel_len) {
00591 if (num_samples[c] < min_channel_len) {
00592 channels_for_cur_subframe = 0;
00593 min_channel_len = num_samples[c];
00594 }
00595 ++channels_for_cur_subframe;
00596 }
00597 }
00598 } while (min_channel_len < s->samples_per_frame);
00599
00600 for (c = 0; c < s->num_channels; c++) {
00601 int i;
00602 int offset = 0;
00603 for (i = 0; i < s->channel[c].num_subframes; i++) {
00604 av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
00605 " len %i\n", s->frame_num, c, i,
00606 s->channel[c].subframe_len[i]);
00607 s->channel[c].subframe_offset[i] = offset;
00608 offset += s->channel[c].subframe_len[i];
00609 }
00610 }
00611
00612 return 0;
00613 }
00614
00620 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
00621 WMAProChannelGrp *chgroup)
00622 {
00623 int i;
00624 int offset = 0;
00625 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
00626 memset(chgroup->decorrelation_matrix, 0, s->num_channels *
00627 s->num_channels * sizeof(*chgroup->decorrelation_matrix));
00628
00629 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
00630 rotation_offset[i] = get_bits(&s->gb, 6);
00631
00632 for (i = 0; i < chgroup->num_channels; i++)
00633 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
00634 get_bits1(&s->gb) ? 1.0 : -1.0;
00635
00636 for (i = 1; i < chgroup->num_channels; i++) {
00637 int x;
00638 for (x = 0; x < i; x++) {
00639 int y;
00640 for (y = 0; y < i + 1; y++) {
00641 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
00642 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
00643 int n = rotation_offset[offset + x];
00644 float sinv;
00645 float cosv;
00646
00647 if (n < 32) {
00648 sinv = sin64[n];
00649 cosv = sin64[32 - n];
00650 } else {
00651 sinv = sin64[64 - n];
00652 cosv = -sin64[n - 32];
00653 }
00654
00655 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
00656 (v1 * sinv) - (v2 * cosv);
00657 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
00658 (v1 * cosv) + (v2 * sinv);
00659 }
00660 }
00661 offset += i;
00662 }
00663 }
00664
00670 static int decode_channel_transform(WMAProDecodeCtx* s)
00671 {
00672 int i;
00673
00674
00675
00676
00677
00679 s->num_chgroups = 0;
00680 if (s->num_channels > 1) {
00681 int remaining_channels = s->channels_for_cur_subframe;
00682
00683 if (get_bits1(&s->gb)) {
00684 av_log_ask_for_sample(s->avctx,
00685 "unsupported channel transform bit\n");
00686 return AVERROR_INVALIDDATA;
00687 }
00688
00689 for (s->num_chgroups = 0; remaining_channels &&
00690 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
00691 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
00692 float** channel_data = chgroup->channel_data;
00693 chgroup->num_channels = 0;
00694 chgroup->transform = 0;
00695
00697 if (remaining_channels > 2) {
00698 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00699 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00700 if (!s->channel[channel_idx].grouped
00701 && get_bits1(&s->gb)) {
00702 ++chgroup->num_channels;
00703 s->channel[channel_idx].grouped = 1;
00704 *channel_data++ = s->channel[channel_idx].coeffs;
00705 }
00706 }
00707 } else {
00708 chgroup->num_channels = remaining_channels;
00709 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00710 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00711 if (!s->channel[channel_idx].grouped)
00712 *channel_data++ = s->channel[channel_idx].coeffs;
00713 s->channel[channel_idx].grouped = 1;
00714 }
00715 }
00716
00718 if (chgroup->num_channels == 2) {
00719 if (get_bits1(&s->gb)) {
00720 if (get_bits1(&s->gb)) {
00721 av_log_ask_for_sample(s->avctx,
00722 "unsupported channel transform type\n");
00723 }
00724 } else {
00725 chgroup->transform = 1;
00726 if (s->num_channels == 2) {
00727 chgroup->decorrelation_matrix[0] = 1.0;
00728 chgroup->decorrelation_matrix[1] = -1.0;
00729 chgroup->decorrelation_matrix[2] = 1.0;
00730 chgroup->decorrelation_matrix[3] = 1.0;
00731 } else {
00733 chgroup->decorrelation_matrix[0] = 0.70703125;
00734 chgroup->decorrelation_matrix[1] = -0.70703125;
00735 chgroup->decorrelation_matrix[2] = 0.70703125;
00736 chgroup->decorrelation_matrix[3] = 0.70703125;
00737 }
00738 }
00739 } else if (chgroup->num_channels > 2) {
00740 if (get_bits1(&s->gb)) {
00741 chgroup->transform = 1;
00742 if (get_bits1(&s->gb)) {
00743 decode_decorrelation_matrix(s, chgroup);
00744 } else {
00746 if (chgroup->num_channels > 6) {
00747 av_log_ask_for_sample(s->avctx,
00748 "coupled channels > 6\n");
00749 } else {
00750 memcpy(chgroup->decorrelation_matrix,
00751 default_decorrelation[chgroup->num_channels],
00752 chgroup->num_channels * chgroup->num_channels *
00753 sizeof(*chgroup->decorrelation_matrix));
00754 }
00755 }
00756 }
00757 }
00758
00760 if (chgroup->transform) {
00761 if (!get_bits1(&s->gb)) {
00762 int i;
00764 for (i = 0; i < s->num_bands; i++) {
00765 chgroup->transform_band[i] = get_bits1(&s->gb);
00766 }
00767 } else {
00768 memset(chgroup->transform_band, 1, s->num_bands);
00769 }
00770 }
00771 remaining_channels -= chgroup->num_channels;
00772 }
00773 }
00774 return 0;
00775 }
00776
00783 static int decode_coeffs(WMAProDecodeCtx *s, int c)
00784 {
00785
00786
00787
00788 static const uint32_t fval_tab[16] = {
00789 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
00790 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
00791 0x41000000, 0x41100000, 0x41200000, 0x41300000,
00792 0x41400000, 0x41500000, 0x41600000, 0x41700000,
00793 };
00794 int vlctable;
00795 VLC* vlc;
00796 WMAProChannelCtx* ci = &s->channel[c];
00797 int rl_mode = 0;
00798 int cur_coeff = 0;
00799 int num_zeros = 0;
00800 const uint16_t* run;
00801 const float* level;
00802
00803 av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
00804
00805 vlctable = get_bits1(&s->gb);
00806 vlc = &coef_vlc[vlctable];
00807
00808 if (vlctable) {
00809 run = coef1_run;
00810 level = coef1_level;
00811 } else {
00812 run = coef0_run;
00813 level = coef0_level;
00814 }
00815
00818 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
00819 (cur_coeff + 3 < ci->num_vec_coeffs)) {
00820 uint32_t vals[4];
00821 int i;
00822 unsigned int idx;
00823
00824 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
00825
00826 if (idx == HUFF_VEC4_SIZE - 1) {
00827 for (i = 0; i < 4; i += 2) {
00828 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
00829 if (idx == HUFF_VEC2_SIZE - 1) {
00830 uint32_t v0, v1;
00831 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00832 if (v0 == HUFF_VEC1_SIZE - 1)
00833 v0 += ff_wma_get_large_val(&s->gb);
00834 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00835 if (v1 == HUFF_VEC1_SIZE - 1)
00836 v1 += ff_wma_get_large_val(&s->gb);
00837 vals[i ] = av_float2int(v0);
00838 vals[i+1] = av_float2int(v1);
00839 } else {
00840 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
00841 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
00842 }
00843 }
00844 } else {
00845 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
00846 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
00847 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
00848 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
00849 }
00850
00852 for (i = 0; i < 4; i++) {
00853 if (vals[i]) {
00854 uint32_t sign = get_bits1(&s->gb) - 1;
00855 AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
00856 num_zeros = 0;
00857 } else {
00858 ci->coeffs[cur_coeff] = 0;
00861 rl_mode |= (++num_zeros > s->subframe_len >> 8);
00862 }
00863 ++cur_coeff;
00864 }
00865 }
00866
00868 if (cur_coeff < s->subframe_len) {
00869 memset(&ci->coeffs[cur_coeff], 0,
00870 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
00871 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
00872 level, run, 1, ci->coeffs,
00873 cur_coeff, s->subframe_len,
00874 s->subframe_len, s->esc_len, 0))
00875 return AVERROR_INVALIDDATA;
00876 }
00877
00878 return 0;
00879 }
00880
00886 static int decode_scale_factors(WMAProDecodeCtx* s)
00887 {
00888 int i;
00889
00894 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00895 int c = s->channel_indexes_for_cur_subframe[i];
00896 int* sf;
00897 int* sf_end;
00898 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
00899 sf_end = s->channel[c].scale_factors + s->num_bands;
00900
00906 if (s->channel[c].reuse_sf) {
00907 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
00908 int b;
00909 for (b = 0; b < s->num_bands; b++)
00910 s->channel[c].scale_factors[b] =
00911 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
00912 }
00913
00914 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
00915
00916 if (!s->channel[c].reuse_sf) {
00917 int val;
00919 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
00920 val = 45 / s->channel[c].scale_factor_step;
00921 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
00922 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
00923 *sf = val;
00924 }
00925 } else {
00926 int i;
00928 for (i = 0; i < s->num_bands; i++) {
00929 int idx;
00930 int skip;
00931 int val;
00932 int sign;
00933
00934 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
00935
00936 if (!idx) {
00937 uint32_t code = get_bits(&s->gb, 14);
00938 val = code >> 6;
00939 sign = (code & 1) - 1;
00940 skip = (code & 0x3f) >> 1;
00941 } else if (idx == 1) {
00942 break;
00943 } else {
00944 skip = scale_rl_run[idx];
00945 val = scale_rl_level[idx];
00946 sign = get_bits1(&s->gb)-1;
00947 }
00948
00949 i += skip;
00950 if (i >= s->num_bands) {
00951 av_log(s->avctx, AV_LOG_ERROR,
00952 "invalid scale factor coding\n");
00953 return AVERROR_INVALIDDATA;
00954 }
00955 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
00956 }
00957 }
00959 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
00960 s->channel[c].table_idx = s->table_idx;
00961 s->channel[c].reuse_sf = 1;
00962 }
00963
00965 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
00966 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
00967 s->channel[c].max_scale_factor =
00968 FFMAX(s->channel[c].max_scale_factor, *sf);
00969 }
00970
00971 }
00972 return 0;
00973 }
00974
00979 static void inverse_channel_transform(WMAProDecodeCtx *s)
00980 {
00981 int i;
00982
00983 for (i = 0; i < s->num_chgroups; i++) {
00984 if (s->chgroup[i].transform) {
00985 float data[WMAPRO_MAX_CHANNELS];
00986 const int num_channels = s->chgroup[i].num_channels;
00987 float** ch_data = s->chgroup[i].channel_data;
00988 float** ch_end = ch_data + num_channels;
00989 const int8_t* tb = s->chgroup[i].transform_band;
00990 int16_t* sfb;
00991
00993 for (sfb = s->cur_sfb_offsets;
00994 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
00995 int y;
00996 if (*tb++ == 1) {
00998 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
00999 const float* mat = s->chgroup[i].decorrelation_matrix;
01000 const float* data_end = data + num_channels;
01001 float* data_ptr = data;
01002 float** ch;
01003
01004 for (ch = ch_data; ch < ch_end; ch++)
01005 *data_ptr++ = (*ch)[y];
01006
01007 for (ch = ch_data; ch < ch_end; ch++) {
01008 float sum = 0;
01009 data_ptr = data;
01010 while (data_ptr < data_end)
01011 sum += *data_ptr++ * *mat++;
01012
01013 (*ch)[y] = sum;
01014 }
01015 }
01016 } else if (s->num_channels == 2) {
01017 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
01018 s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
01019 ch_data[0] + sfb[0],
01020 181.0 / 128, len);
01021 s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
01022 ch_data[1] + sfb[0],
01023 181.0 / 128, len);
01024 }
01025 }
01026 }
01027 }
01028 }
01029
01034 static void wmapro_window(WMAProDecodeCtx *s)
01035 {
01036 int i;
01037 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01038 int c = s->channel_indexes_for_cur_subframe[i];
01039 float* window;
01040 int winlen = s->channel[c].prev_block_len;
01041 float* start = s->channel[c].coeffs - (winlen >> 1);
01042
01043 if (s->subframe_len < winlen) {
01044 start += (winlen - s->subframe_len) >> 1;
01045 winlen = s->subframe_len;
01046 }
01047
01048 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
01049
01050 winlen >>= 1;
01051
01052 s->dsp.vector_fmul_window(start, start, start + winlen,
01053 window, winlen);
01054
01055 s->channel[c].prev_block_len = s->subframe_len;
01056 }
01057 }
01058
01064 static int decode_subframe(WMAProDecodeCtx *s)
01065 {
01066 int offset = s->samples_per_frame;
01067 int subframe_len = s->samples_per_frame;
01068 int i;
01069 int total_samples = s->samples_per_frame * s->num_channels;
01070 int transmit_coeffs = 0;
01071 int cur_subwoofer_cutoff;
01072
01073 s->subframe_offset = get_bits_count(&s->gb);
01074
01079 for (i = 0; i < s->num_channels; i++) {
01080 s->channel[i].grouped = 0;
01081 if (offset > s->channel[i].decoded_samples) {
01082 offset = s->channel[i].decoded_samples;
01083 subframe_len =
01084 s->channel[i].subframe_len[s->channel[i].cur_subframe];
01085 }
01086 }
01087
01088 av_dlog(s->avctx,
01089 "processing subframe with offset %i len %i\n", offset, subframe_len);
01090
01092 s->channels_for_cur_subframe = 0;
01093 for (i = 0; i < s->num_channels; i++) {
01094 const int cur_subframe = s->channel[i].cur_subframe;
01096 total_samples -= s->channel[i].decoded_samples;
01097
01099 if (offset == s->channel[i].decoded_samples &&
01100 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
01101 total_samples -= s->channel[i].subframe_len[cur_subframe];
01102 s->channel[i].decoded_samples +=
01103 s->channel[i].subframe_len[cur_subframe];
01104 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
01105 ++s->channels_for_cur_subframe;
01106 }
01107 }
01108
01111 if (!total_samples)
01112 s->parsed_all_subframes = 1;
01113
01114
01115 av_dlog(s->avctx, "subframe is part of %i channels\n",
01116 s->channels_for_cur_subframe);
01117
01119 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
01120 s->num_bands = s->num_sfb[s->table_idx];
01121 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
01122 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
01123
01125 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01126 int c = s->channel_indexes_for_cur_subframe[i];
01127
01128 s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
01129 + offset];
01130 }
01131
01132 s->subframe_len = subframe_len;
01133 s->esc_len = av_log2(s->subframe_len - 1) + 1;
01134
01136 if (get_bits1(&s->gb)) {
01137 int num_fill_bits;
01138 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
01139 int len = get_bits(&s->gb, 4);
01140 num_fill_bits = get_bits(&s->gb, len) + 1;
01141 }
01142
01143 if (num_fill_bits >= 0) {
01144 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
01145 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
01146 return AVERROR_INVALIDDATA;
01147 }
01148
01149 skip_bits_long(&s->gb, num_fill_bits);
01150 }
01151 }
01152
01154 if (get_bits1(&s->gb)) {
01155 av_log_ask_for_sample(s->avctx, "reserved bit set\n");
01156 return AVERROR_INVALIDDATA;
01157 }
01158
01159
01160 if (decode_channel_transform(s) < 0)
01161 return AVERROR_INVALIDDATA;
01162
01163
01164 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01165 int c = s->channel_indexes_for_cur_subframe[i];
01166 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
01167 transmit_coeffs = 1;
01168 }
01169
01170 if (transmit_coeffs) {
01171 int step;
01172 int quant_step = 90 * s->bits_per_sample >> 4;
01173
01175 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
01176 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
01177 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01178 int c = s->channel_indexes_for_cur_subframe[i];
01179 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
01180 if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) {
01181 av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
01182 return AVERROR_INVALIDDATA;
01183 }
01184 s->channel[c].num_vec_coeffs = num_vec_coeffs;
01185 }
01186 } else {
01187 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01188 int c = s->channel_indexes_for_cur_subframe[i];
01189 s->channel[c].num_vec_coeffs = s->subframe_len;
01190 }
01191 }
01193 step = get_sbits(&s->gb, 6);
01194 quant_step += step;
01195 if (step == -32 || step == 31) {
01196 const int sign = (step == 31) - 1;
01197 int quant = 0;
01198 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
01199 (step = get_bits(&s->gb, 5)) == 31) {
01200 quant += 31;
01201 }
01202 quant_step += ((quant + step) ^ sign) - sign;
01203 }
01204 if (quant_step < 0) {
01205 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
01206 }
01207
01210 if (s->channels_for_cur_subframe == 1) {
01211 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
01212 } else {
01213 int modifier_len = get_bits(&s->gb, 3);
01214 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01215 int c = s->channel_indexes_for_cur_subframe[i];
01216 s->channel[c].quant_step = quant_step;
01217 if (get_bits1(&s->gb)) {
01218 if (modifier_len) {
01219 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
01220 } else
01221 ++s->channel[c].quant_step;
01222 }
01223 }
01224 }
01225
01227 if (decode_scale_factors(s) < 0)
01228 return AVERROR_INVALIDDATA;
01229 }
01230
01231 av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
01232 get_bits_count(&s->gb) - s->subframe_offset);
01233
01235 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01236 int c = s->channel_indexes_for_cur_subframe[i];
01237 if (s->channel[c].transmit_coefs &&
01238 get_bits_count(&s->gb) < s->num_saved_bits) {
01239 decode_coeffs(s, c);
01240 } else
01241 memset(s->channel[c].coeffs, 0,
01242 sizeof(*s->channel[c].coeffs) * subframe_len);
01243 }
01244
01245 av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
01246 get_bits_count(&s->gb) - s->subframe_offset);
01247
01248 if (transmit_coeffs) {
01249 FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
01251 inverse_channel_transform(s);
01252 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01253 int c = s->channel_indexes_for_cur_subframe[i];
01254 const int* sf = s->channel[c].scale_factors;
01255 int b;
01256
01257 if (c == s->lfe_channel)
01258 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
01259 (subframe_len - cur_subwoofer_cutoff));
01260
01262 for (b = 0; b < s->num_bands; b++) {
01263 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
01264 const int exp = s->channel[c].quant_step -
01265 (s->channel[c].max_scale_factor - *sf++) *
01266 s->channel[c].scale_factor_step;
01267 const float quant = pow(10.0, exp / 20.0);
01268 int start = s->cur_sfb_offsets[b];
01269 s->dsp.vector_fmul_scalar(s->tmp + start,
01270 s->channel[c].coeffs + start,
01271 quant, end - start);
01272 }
01273
01275 mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
01276 }
01277 }
01278
01280 wmapro_window(s);
01281
01283 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01284 int c = s->channel_indexes_for_cur_subframe[i];
01285 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
01286 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
01287 return AVERROR_INVALIDDATA;
01288 }
01289 ++s->channel[c].cur_subframe;
01290 }
01291
01292 return 0;
01293 }
01294
01301 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
01302 {
01303 AVCodecContext *avctx = s->avctx;
01304 GetBitContext* gb = &s->gb;
01305 int more_frames = 0;
01306 int len = 0;
01307 int i, ret;
01308 const float *out_ptr[WMAPRO_MAX_CHANNELS];
01309 float *samples;
01310
01312 if (s->len_prefix)
01313 len = get_bits(gb, s->log2_frame_size);
01314
01315 av_dlog(s->avctx, "decoding frame with length %x\n", len);
01316
01318 if (decode_tilehdr(s)) {
01319 s->packet_loss = 1;
01320 return 0;
01321 }
01322
01324 if (s->num_channels > 1 && get_bits1(gb)) {
01325 if (get_bits1(gb)) {
01326 for (i = 0; i < s->num_channels * s->num_channels; i++)
01327 skip_bits(gb, 4);
01328 }
01329 }
01330
01332 if (s->dynamic_range_compression) {
01333 s->drc_gain = get_bits(gb, 8);
01334 av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
01335 }
01336
01339 if (get_bits1(gb)) {
01340 int av_unused skip;
01341
01343 if (get_bits1(gb)) {
01344 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01345 av_dlog(s->avctx, "start skip: %i\n", skip);
01346 }
01347
01349 if (get_bits1(gb)) {
01350 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01351 av_dlog(s->avctx, "end skip: %i\n", skip);
01352 }
01353
01354 }
01355
01356 av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
01357 get_bits_count(gb) - s->frame_offset);
01358
01360 s->parsed_all_subframes = 0;
01361 for (i = 0; i < s->num_channels; i++) {
01362 s->channel[i].decoded_samples = 0;
01363 s->channel[i].cur_subframe = 0;
01364 s->channel[i].reuse_sf = 0;
01365 }
01366
01368 while (!s->parsed_all_subframes) {
01369 if (decode_subframe(s) < 0) {
01370 s->packet_loss = 1;
01371 return 0;
01372 }
01373 }
01374
01375
01376 s->frame.nb_samples = s->samples_per_frame;
01377 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
01378 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01379 s->packet_loss = 1;
01380 return 0;
01381 }
01382 samples = (float *)s->frame.data[0];
01383
01385 for (i = 0; i < s->num_channels; i++)
01386 out_ptr[i] = s->channel[i].out;
01387 s->fmt_conv.float_interleave(samples, out_ptr, s->samples_per_frame,
01388 s->num_channels);
01389
01390 for (i = 0; i < s->num_channels; i++) {
01392 memcpy(&s->channel[i].out[0],
01393 &s->channel[i].out[s->samples_per_frame],
01394 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
01395 }
01396
01397 if (s->skip_frame) {
01398 s->skip_frame = 0;
01399 *got_frame_ptr = 0;
01400 } else {
01401 *got_frame_ptr = 1;
01402 }
01403
01404 if (s->len_prefix) {
01405 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
01407 av_log(s->avctx, AV_LOG_ERROR,
01408 "frame[%i] would have to skip %i bits\n", s->frame_num,
01409 len - (get_bits_count(gb) - s->frame_offset) - 1);
01410 s->packet_loss = 1;
01411 return 0;
01412 }
01413
01415 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
01416 } else {
01417 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
01418 }
01419 }
01420
01422 more_frames = get_bits1(gb);
01423
01424 ++s->frame_num;
01425 return more_frames;
01426 }
01427
01434 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
01435 {
01436 return s->buf_bit_size - get_bits_count(gb);
01437 }
01438
01446 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
01447 int append)
01448 {
01449 int buflen;
01450
01455 if (!append) {
01456 s->frame_offset = get_bits_count(gb) & 7;
01457 s->num_saved_bits = s->frame_offset;
01458 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
01459 }
01460
01461 buflen = (s->num_saved_bits + len + 8) >> 3;
01462
01463 if (len <= 0 || buflen > MAX_FRAMESIZE) {
01464 av_log_ask_for_sample(s->avctx, "input buffer too small\n");
01465 s->packet_loss = 1;
01466 return;
01467 }
01468
01469 s->num_saved_bits += len;
01470 if (!append) {
01471 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
01472 s->num_saved_bits);
01473 } else {
01474 int align = 8 - (get_bits_count(gb) & 7);
01475 align = FFMIN(align, len);
01476 put_bits(&s->pb, align, get_bits(gb, align));
01477 len -= align;
01478 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
01479 }
01480 skip_bits_long(gb, len);
01481
01482 {
01483 PutBitContext tmp = s->pb;
01484 flush_put_bits(&tmp);
01485 }
01486
01487 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
01488 skip_bits(&s->gb, s->frame_offset);
01489 }
01490
01499 static int decode_packet(AVCodecContext *avctx, void *data,
01500 int *got_frame_ptr, AVPacket* avpkt)
01501 {
01502 WMAProDecodeCtx *s = avctx->priv_data;
01503 GetBitContext* gb = &s->pgb;
01504 const uint8_t* buf = avpkt->data;
01505 int buf_size = avpkt->size;
01506 int num_bits_prev_frame;
01507 int packet_sequence_number;
01508
01509 *got_frame_ptr = 0;
01510
01511 if (s->packet_done || s->packet_loss) {
01512 s->packet_done = 0;
01513
01515 if (buf_size < avctx->block_align) {
01516 av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
01517 buf_size, avctx->block_align);
01518 return AVERROR_INVALIDDATA;
01519 }
01520
01521 s->next_packet_start = buf_size - avctx->block_align;
01522 buf_size = avctx->block_align;
01523 s->buf_bit_size = buf_size << 3;
01524
01526 init_get_bits(gb, buf, s->buf_bit_size);
01527 packet_sequence_number = get_bits(gb, 4);
01528 skip_bits(gb, 2);
01529
01531 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
01532 av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
01533 num_bits_prev_frame);
01534
01536 if (!s->packet_loss &&
01537 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
01538 s->packet_loss = 1;
01539 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
01540 s->packet_sequence_number, packet_sequence_number);
01541 }
01542 s->packet_sequence_number = packet_sequence_number;
01543
01544 if (num_bits_prev_frame > 0) {
01545 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
01546 if (num_bits_prev_frame >= remaining_packet_bits) {
01547 num_bits_prev_frame = remaining_packet_bits;
01548 s->packet_done = 1;
01549 }
01550
01553 save_bits(s, gb, num_bits_prev_frame, 1);
01554 av_dlog(avctx, "accumulated %x bits of frame data\n",
01555 s->num_saved_bits - s->frame_offset);
01556
01558 if (!s->packet_loss)
01559 decode_frame(s, got_frame_ptr);
01560 } else if (s->num_saved_bits - s->frame_offset) {
01561 av_dlog(avctx, "ignoring %x previously saved bits\n",
01562 s->num_saved_bits - s->frame_offset);
01563 }
01564
01565 if (s->packet_loss) {
01569 s->num_saved_bits = 0;
01570 s->packet_loss = 0;
01571 }
01572
01573 } else {
01574 int frame_size;
01575 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
01576 init_get_bits(gb, avpkt->data, s->buf_bit_size);
01577 skip_bits(gb, s->packet_offset);
01578 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
01579 (frame_size = show_bits(gb, s->log2_frame_size)) &&
01580 frame_size <= remaining_bits(s, gb)) {
01581 save_bits(s, gb, frame_size, 0);
01582 s->packet_done = !decode_frame(s, got_frame_ptr);
01583 } else if (!s->len_prefix
01584 && s->num_saved_bits > get_bits_count(&s->gb)) {
01592 s->packet_done = !decode_frame(s, got_frame_ptr);
01593 } else
01594 s->packet_done = 1;
01595 }
01596
01597 if (s->packet_done && !s->packet_loss &&
01598 remaining_bits(s, gb) > 0) {
01601 save_bits(s, gb, remaining_bits(s, gb), 0);
01602 }
01603
01604 s->packet_offset = get_bits_count(gb) & 7;
01605 if (s->packet_loss)
01606 return AVERROR_INVALIDDATA;
01607
01608 if (*got_frame_ptr)
01609 *(AVFrame *)data = s->frame;
01610
01611 return get_bits_count(gb) >> 3;
01612 }
01613
01618 static void flush(AVCodecContext *avctx)
01619 {
01620 WMAProDecodeCtx *s = avctx->priv_data;
01621 int i;
01624 for (i = 0; i < s->num_channels; i++)
01625 memset(s->channel[i].out, 0, s->samples_per_frame *
01626 sizeof(*s->channel[i].out));
01627 s->packet_loss = 1;
01628 }
01629
01630
01634 AVCodec ff_wmapro_decoder = {
01635 .name = "wmapro",
01636 .type = AVMEDIA_TYPE_AUDIO,
01637 .id = CODEC_ID_WMAPRO,
01638 .priv_data_size = sizeof(WMAProDecodeCtx),
01639 .init = decode_init,
01640 .close = decode_end,
01641 .decode = decode_packet,
01642 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
01643 .flush= flush,
01644 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
01645 };