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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_MIN_SIZE (1 << WMAPRO_BLOCK_MIN_BITS) ///< minimum block size
00110 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size
00111 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
00112
00113
00114 #define VLCBITS 9
00115 #define SCALEVLCBITS 8
00116 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
00117 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
00118 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
00119 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
00120 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
00121
00122 static VLC sf_vlc;
00123 static VLC sf_rl_vlc;
00124 static VLC vec4_vlc;
00125 static VLC vec2_vlc;
00126 static VLC vec1_vlc;
00127 static VLC coef_vlc[2];
00128 static float sin64[33];
00129
00133 typedef struct {
00134 int16_t prev_block_len;
00135 uint8_t transmit_coefs;
00136 uint8_t num_subframes;
00137 uint16_t subframe_len[MAX_SUBFRAMES];
00138 uint16_t subframe_offset[MAX_SUBFRAMES];
00139 uint8_t cur_subframe;
00140 uint16_t decoded_samples;
00141 uint8_t grouped;
00142 int quant_step;
00143 int8_t reuse_sf;
00144 int8_t scale_factor_step;
00145 int max_scale_factor;
00146 int saved_scale_factors[2][MAX_BANDS];
00147 int8_t scale_factor_idx;
00148 int* scale_factors;
00149 uint8_t table_idx;
00150 float* coeffs;
00151 uint16_t num_vec_coeffs;
00152 DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2];
00153 } WMAProChannelCtx;
00154
00158 typedef struct {
00159 uint8_t num_channels;
00160 int8_t transform;
00161 int8_t transform_band[MAX_BANDS];
00162 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
00163 float* channel_data[WMAPRO_MAX_CHANNELS];
00164 } WMAProChannelGrp;
00165
00169 typedef struct WMAProDecodeCtx {
00170
00171 AVCodecContext* avctx;
00172 AVFrame frame;
00173 DSPContext dsp;
00174 FmtConvertContext fmt_conv;
00175 uint8_t frame_data[MAX_FRAMESIZE +
00176 FF_INPUT_BUFFER_PADDING_SIZE];
00177 PutBitContext pb;
00178 FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES];
00179 DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE];
00180 float* windows[WMAPRO_BLOCK_SIZES];
00181
00182
00183 uint32_t decode_flags;
00184 uint8_t len_prefix;
00185 uint8_t dynamic_range_compression;
00186 uint8_t bits_per_sample;
00187 uint16_t samples_per_frame;
00188 uint16_t log2_frame_size;
00189 int8_t num_channels;
00190 int8_t lfe_channel;
00191 uint8_t max_num_subframes;
00192 uint8_t subframe_len_bits;
00193 uint8_t max_subframe_len_bit;
00194 uint16_t min_samples_per_subframe;
00195 int8_t num_sfb[WMAPRO_BLOCK_SIZES];
00196 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS];
00197 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS];
00198 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES];
00199
00200
00201 GetBitContext pgb;
00202 int next_packet_start;
00203 uint8_t packet_offset;
00204 uint8_t packet_sequence_number;
00205 int num_saved_bits;
00206 int frame_offset;
00207 int subframe_offset;
00208 uint8_t packet_loss;
00209 uint8_t packet_done;
00210
00211
00212 uint32_t frame_num;
00213 GetBitContext gb;
00214 int buf_bit_size;
00215 uint8_t drc_gain;
00216 int8_t skip_frame;
00217 int8_t parsed_all_subframes;
00218
00219
00220 int16_t subframe_len;
00221 int8_t channels_for_cur_subframe;
00222 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
00223 int8_t num_bands;
00224 int8_t transmit_num_vec_coeffs;
00225 int16_t* cur_sfb_offsets;
00226 uint8_t table_idx;
00227 int8_t esc_len;
00228
00229 uint8_t num_chgroups;
00230 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS];
00231
00232 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS];
00233 } WMAProDecodeCtx;
00234
00235
00240 static void av_cold dump_context(WMAProDecodeCtx *s)
00241 {
00242 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
00243 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b);
00244
00245 PRINT("ed sample bit depth", s->bits_per_sample);
00246 PRINT_HEX("ed decode flags", s->decode_flags);
00247 PRINT("samples per frame", s->samples_per_frame);
00248 PRINT("log2 frame size", s->log2_frame_size);
00249 PRINT("max num subframes", s->max_num_subframes);
00250 PRINT("len prefix", s->len_prefix);
00251 PRINT("num channels", s->num_channels);
00252 }
00253
00259 static av_cold int decode_end(AVCodecContext *avctx)
00260 {
00261 WMAProDecodeCtx *s = avctx->priv_data;
00262 int i;
00263
00264 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00265 ff_mdct_end(&s->mdct_ctx[i]);
00266
00267 return 0;
00268 }
00269
00275 static av_cold int decode_init(AVCodecContext *avctx)
00276 {
00277 WMAProDecodeCtx *s = avctx->priv_data;
00278 uint8_t *edata_ptr = avctx->extradata;
00279 unsigned int channel_mask;
00280 int i;
00281 int log2_max_num_subframes;
00282 int num_possible_block_sizes;
00283
00284 if (!avctx->block_align) {
00285 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
00286 return AVERROR(EINVAL);
00287 }
00288
00289 s->avctx = avctx;
00290 dsputil_init(&s->dsp, avctx);
00291 ff_fmt_convert_init(&s->fmt_conv, avctx);
00292 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
00293
00294 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
00295
00296 if (avctx->extradata_size >= 18) {
00297 s->decode_flags = AV_RL16(edata_ptr+14);
00298 channel_mask = AV_RL32(edata_ptr+2);
00299 s->bits_per_sample = AV_RL16(edata_ptr);
00301 for (i = 0; i < avctx->extradata_size; i++)
00302 av_dlog(avctx, "[%x] ", avctx->extradata[i]);
00303 av_dlog(avctx, "\n");
00304
00305 } else {
00306 av_log_ask_for_sample(avctx, "Unknown extradata size\n");
00307 return AVERROR_INVALIDDATA;
00308 }
00309
00311 s->log2_frame_size = av_log2(avctx->block_align) + 4;
00312
00314 s->skip_frame = 1;
00315 s->packet_loss = 1;
00316 s->len_prefix = (s->decode_flags & 0x40);
00317
00319 s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
00320 3, s->decode_flags);
00321
00323 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
00324 s->max_num_subframes = 1 << log2_max_num_subframes;
00325 if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
00326 s->max_subframe_len_bit = 1;
00327 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
00328
00329 num_possible_block_sizes = log2_max_num_subframes + 1;
00330 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
00331 s->dynamic_range_compression = (s->decode_flags & 0x80);
00332
00333 if (s->max_num_subframes > MAX_SUBFRAMES) {
00334 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
00335 s->max_num_subframes);
00336 return AVERROR_INVALIDDATA;
00337 }
00338
00339 if (s->min_samples_per_subframe < WMAPRO_BLOCK_MIN_SIZE) {
00340 av_log(avctx, AV_LOG_ERROR, "Invalid minimum block size %i\n",
00341 s->max_num_subframes);
00342 return AVERROR_INVALIDDATA;
00343 }
00344
00345 if (s->avctx->sample_rate <= 0) {
00346 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
00347 return AVERROR_INVALIDDATA;
00348 }
00349
00350 s->num_channels = avctx->channels;
00351
00352 if (s->num_channels < 0) {
00353 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
00354 return AVERROR_INVALIDDATA;
00355 } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
00356 av_log_ask_for_sample(avctx, "unsupported number of channels\n");
00357 return AVERROR_PATCHWELCOME;
00358 }
00359
00361 for (i = 0; i < s->num_channels; i++)
00362 s->channel[i].prev_block_len = s->samples_per_frame;
00363
00365 s->lfe_channel = -1;
00366
00367 if (channel_mask & 8) {
00368 unsigned int mask;
00369 for (mask = 1; mask < 16; mask <<= 1) {
00370 if (channel_mask & mask)
00371 ++s->lfe_channel;
00372 }
00373 }
00374
00375 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
00376 scale_huffbits, 1, 1,
00377 scale_huffcodes, 2, 2, 616);
00378
00379 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
00380 scale_rl_huffbits, 1, 1,
00381 scale_rl_huffcodes, 4, 4, 1406);
00382
00383 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
00384 coef0_huffbits, 1, 1,
00385 coef0_huffcodes, 4, 4, 2108);
00386
00387 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
00388 coef1_huffbits, 1, 1,
00389 coef1_huffcodes, 4, 4, 3912);
00390
00391 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
00392 vec4_huffbits, 1, 1,
00393 vec4_huffcodes, 2, 2, 604);
00394
00395 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
00396 vec2_huffbits, 1, 1,
00397 vec2_huffcodes, 2, 2, 562);
00398
00399 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
00400 vec1_huffbits, 1, 1,
00401 vec1_huffcodes, 2, 2, 562);
00402
00405 for (i = 0; i < num_possible_block_sizes; i++) {
00406 int subframe_len = s->samples_per_frame >> i;
00407 int x;
00408 int band = 1;
00409
00410 s->sfb_offsets[i][0] = 0;
00411
00412 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
00413 int offset = (subframe_len * 2 * critical_freq[x])
00414 / s->avctx->sample_rate + 2;
00415 offset &= ~3;
00416 if (offset > s->sfb_offsets[i][band - 1])
00417 s->sfb_offsets[i][band++] = offset;
00418 }
00419 s->sfb_offsets[i][band - 1] = subframe_len;
00420 s->num_sfb[i] = band - 1;
00421 }
00422
00423
00429 for (i = 0; i < num_possible_block_sizes; i++) {
00430 int b;
00431 for (b = 0; b < s->num_sfb[i]; b++) {
00432 int x;
00433 int offset = ((s->sfb_offsets[i][b]
00434 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
00435 for (x = 0; x < num_possible_block_sizes; x++) {
00436 int v = 0;
00437 while (s->sfb_offsets[x][v + 1] << x < offset)
00438 if (++v >= MAX_BANDS)
00439 return AVERROR_INVALIDDATA;
00440 s->sf_offsets[i][x][b] = v;
00441 }
00442 }
00443 }
00444
00446 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00447 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
00448 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
00449 / (1 << (s->bits_per_sample - 1)));
00450
00452 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
00453 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
00454 ff_init_ff_sine_windows(win_idx);
00455 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
00456 }
00457
00459 for (i = 0; i < num_possible_block_sizes; i++) {
00460 int block_size = s->samples_per_frame >> i;
00461 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
00462 / s->avctx->sample_rate;
00463 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
00464 }
00465
00467 for (i = 0; i < 33; i++)
00468 sin64[i] = sin(i*M_PI / 64.0);
00469
00470 if (avctx->debug & FF_DEBUG_BITSTREAM)
00471 dump_context(s);
00472
00473 avctx->channel_layout = channel_mask;
00474
00475 avcodec_get_frame_defaults(&s->frame);
00476 avctx->coded_frame = &s->frame;
00477
00478 return 0;
00479 }
00480
00487 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
00488 {
00489 int frame_len_shift = 0;
00490 int subframe_len;
00491
00493 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
00494 return s->min_samples_per_subframe;
00495
00497 if (s->max_subframe_len_bit) {
00498 if (get_bits1(&s->gb))
00499 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
00500 } else
00501 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
00502
00503 subframe_len = s->samples_per_frame >> frame_len_shift;
00504
00506 if (subframe_len < s->min_samples_per_subframe ||
00507 subframe_len > s->samples_per_frame) {
00508 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
00509 subframe_len);
00510 return AVERROR_INVALIDDATA;
00511 }
00512 return subframe_len;
00513 }
00514
00535 static int decode_tilehdr(WMAProDecodeCtx *s)
00536 {
00537 uint16_t num_samples[WMAPRO_MAX_CHANNELS];
00538 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
00539 int channels_for_cur_subframe = s->num_channels;
00540 int fixed_channel_layout = 0;
00541 int min_channel_len = 0;
00542 int c;
00543
00544
00545
00546
00547
00548
00549
00551 for (c = 0; c < s->num_channels; c++)
00552 s->channel[c].num_subframes = 0;
00553
00554 memset(num_samples, 0, sizeof(num_samples));
00555
00556 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
00557 fixed_channel_layout = 1;
00558
00560 do {
00561 int subframe_len;
00562
00564 for (c = 0; c < s->num_channels; c++) {
00565 if (num_samples[c] == min_channel_len) {
00566 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
00567 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
00568 contains_subframe[c] = 1;
00569 else
00570 contains_subframe[c] = get_bits1(&s->gb);
00571 } else
00572 contains_subframe[c] = 0;
00573 }
00574
00576 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
00577 return AVERROR_INVALIDDATA;
00578
00580 min_channel_len += subframe_len;
00581 for (c = 0; c < s->num_channels; c++) {
00582 WMAProChannelCtx* chan = &s->channel[c];
00583
00584 if (contains_subframe[c]) {
00585 if (chan->num_subframes >= MAX_SUBFRAMES) {
00586 av_log(s->avctx, AV_LOG_ERROR,
00587 "broken frame: num subframes > 31\n");
00588 return AVERROR_INVALIDDATA;
00589 }
00590 chan->subframe_len[chan->num_subframes] = subframe_len;
00591 num_samples[c] += subframe_len;
00592 ++chan->num_subframes;
00593 if (num_samples[c] > s->samples_per_frame) {
00594 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
00595 "channel len > samples_per_frame\n");
00596 return AVERROR_INVALIDDATA;
00597 }
00598 } else if (num_samples[c] <= min_channel_len) {
00599 if (num_samples[c] < min_channel_len) {
00600 channels_for_cur_subframe = 0;
00601 min_channel_len = num_samples[c];
00602 }
00603 ++channels_for_cur_subframe;
00604 }
00605 }
00606 } while (min_channel_len < s->samples_per_frame);
00607
00608 for (c = 0; c < s->num_channels; c++) {
00609 int i;
00610 int offset = 0;
00611 for (i = 0; i < s->channel[c].num_subframes; i++) {
00612 av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
00613 " len %i\n", s->frame_num, c, i,
00614 s->channel[c].subframe_len[i]);
00615 s->channel[c].subframe_offset[i] = offset;
00616 offset += s->channel[c].subframe_len[i];
00617 }
00618 }
00619
00620 return 0;
00621 }
00622
00628 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
00629 WMAProChannelGrp *chgroup)
00630 {
00631 int i;
00632 int offset = 0;
00633 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
00634 memset(chgroup->decorrelation_matrix, 0, s->num_channels *
00635 s->num_channels * sizeof(*chgroup->decorrelation_matrix));
00636
00637 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
00638 rotation_offset[i] = get_bits(&s->gb, 6);
00639
00640 for (i = 0; i < chgroup->num_channels; i++)
00641 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
00642 get_bits1(&s->gb) ? 1.0 : -1.0;
00643
00644 for (i = 1; i < chgroup->num_channels; i++) {
00645 int x;
00646 for (x = 0; x < i; x++) {
00647 int y;
00648 for (y = 0; y < i + 1; y++) {
00649 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
00650 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
00651 int n = rotation_offset[offset + x];
00652 float sinv;
00653 float cosv;
00654
00655 if (n < 32) {
00656 sinv = sin64[n];
00657 cosv = sin64[32 - n];
00658 } else {
00659 sinv = sin64[64 - n];
00660 cosv = -sin64[n - 32];
00661 }
00662
00663 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
00664 (v1 * sinv) - (v2 * cosv);
00665 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
00666 (v1 * cosv) + (v2 * sinv);
00667 }
00668 }
00669 offset += i;
00670 }
00671 }
00672
00678 static int decode_channel_transform(WMAProDecodeCtx* s)
00679 {
00680 int i;
00681
00682
00683
00684
00685
00687 s->num_chgroups = 0;
00688 if (s->num_channels > 1) {
00689 int remaining_channels = s->channels_for_cur_subframe;
00690
00691 if (get_bits1(&s->gb)) {
00692 av_log_ask_for_sample(s->avctx,
00693 "unsupported channel transform bit\n");
00694 return AVERROR_INVALIDDATA;
00695 }
00696
00697 for (s->num_chgroups = 0; remaining_channels &&
00698 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
00699 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
00700 float** channel_data = chgroup->channel_data;
00701 chgroup->num_channels = 0;
00702 chgroup->transform = 0;
00703
00705 if (remaining_channels > 2) {
00706 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00707 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00708 if (!s->channel[channel_idx].grouped
00709 && get_bits1(&s->gb)) {
00710 ++chgroup->num_channels;
00711 s->channel[channel_idx].grouped = 1;
00712 *channel_data++ = s->channel[channel_idx].coeffs;
00713 }
00714 }
00715 } else {
00716 chgroup->num_channels = remaining_channels;
00717 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00718 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00719 if (!s->channel[channel_idx].grouped)
00720 *channel_data++ = s->channel[channel_idx].coeffs;
00721 s->channel[channel_idx].grouped = 1;
00722 }
00723 }
00724
00726 if (chgroup->num_channels == 2) {
00727 if (get_bits1(&s->gb)) {
00728 if (get_bits1(&s->gb)) {
00729 av_log_ask_for_sample(s->avctx,
00730 "unsupported channel transform type\n");
00731 return AVERROR_PATCHWELCOME;
00732 }
00733 } else {
00734 chgroup->transform = 1;
00735 if (s->num_channels == 2) {
00736 chgroup->decorrelation_matrix[0] = 1.0;
00737 chgroup->decorrelation_matrix[1] = -1.0;
00738 chgroup->decorrelation_matrix[2] = 1.0;
00739 chgroup->decorrelation_matrix[3] = 1.0;
00740 } else {
00742 chgroup->decorrelation_matrix[0] = 0.70703125;
00743 chgroup->decorrelation_matrix[1] = -0.70703125;
00744 chgroup->decorrelation_matrix[2] = 0.70703125;
00745 chgroup->decorrelation_matrix[3] = 0.70703125;
00746 }
00747 }
00748 } else if (chgroup->num_channels > 2) {
00749 if (get_bits1(&s->gb)) {
00750 chgroup->transform = 1;
00751 if (get_bits1(&s->gb)) {
00752 decode_decorrelation_matrix(s, chgroup);
00753 } else {
00755 if (chgroup->num_channels > 6) {
00756 av_log_ask_for_sample(s->avctx,
00757 "coupled channels > 6\n");
00758 } else {
00759 memcpy(chgroup->decorrelation_matrix,
00760 default_decorrelation[chgroup->num_channels],
00761 chgroup->num_channels * chgroup->num_channels *
00762 sizeof(*chgroup->decorrelation_matrix));
00763 }
00764 }
00765 }
00766 }
00767
00769 if (chgroup->transform) {
00770 if (!get_bits1(&s->gb)) {
00771 int i;
00773 for (i = 0; i < s->num_bands; i++) {
00774 chgroup->transform_band[i] = get_bits1(&s->gb);
00775 }
00776 } else {
00777 memset(chgroup->transform_band, 1, s->num_bands);
00778 }
00779 }
00780 remaining_channels -= chgroup->num_channels;
00781 }
00782 }
00783 return 0;
00784 }
00785
00792 static int decode_coeffs(WMAProDecodeCtx *s, int c)
00793 {
00794
00795
00796
00797 static const uint32_t fval_tab[16] = {
00798 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
00799 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
00800 0x41000000, 0x41100000, 0x41200000, 0x41300000,
00801 0x41400000, 0x41500000, 0x41600000, 0x41700000,
00802 };
00803 int vlctable;
00804 VLC* vlc;
00805 WMAProChannelCtx* ci = &s->channel[c];
00806 int rl_mode = 0;
00807 int cur_coeff = 0;
00808 int num_zeros = 0;
00809 const uint16_t* run;
00810 const float* level;
00811
00812 av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
00813
00814 vlctable = get_bits1(&s->gb);
00815 vlc = &coef_vlc[vlctable];
00816
00817 if (vlctable) {
00818 run = coef1_run;
00819 level = coef1_level;
00820 } else {
00821 run = coef0_run;
00822 level = coef0_level;
00823 }
00824
00827 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
00828 (cur_coeff + 3 < ci->num_vec_coeffs)) {
00829 uint32_t vals[4];
00830 int i;
00831 unsigned int idx;
00832
00833 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
00834
00835 if (idx == HUFF_VEC4_SIZE - 1) {
00836 for (i = 0; i < 4; i += 2) {
00837 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
00838 if (idx == HUFF_VEC2_SIZE - 1) {
00839 uint32_t v0, v1;
00840 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00841 if (v0 == HUFF_VEC1_SIZE - 1)
00842 v0 += ff_wma_get_large_val(&s->gb);
00843 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00844 if (v1 == HUFF_VEC1_SIZE - 1)
00845 v1 += ff_wma_get_large_val(&s->gb);
00846 vals[i ] = av_float2int(v0);
00847 vals[i+1] = av_float2int(v1);
00848 } else {
00849 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
00850 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
00851 }
00852 }
00853 } else {
00854 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
00855 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
00856 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
00857 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
00858 }
00859
00861 for (i = 0; i < 4; i++) {
00862 if (vals[i]) {
00863 uint32_t sign = get_bits1(&s->gb) - 1;
00864 AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
00865 num_zeros = 0;
00866 } else {
00867 ci->coeffs[cur_coeff] = 0;
00870 rl_mode |= (++num_zeros > s->subframe_len >> 8);
00871 }
00872 ++cur_coeff;
00873 }
00874 }
00875
00877 if (cur_coeff < s->subframe_len) {
00878 memset(&ci->coeffs[cur_coeff], 0,
00879 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
00880 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
00881 level, run, 1, ci->coeffs,
00882 cur_coeff, s->subframe_len,
00883 s->subframe_len, s->esc_len, 0))
00884 return AVERROR_INVALIDDATA;
00885 }
00886
00887 return 0;
00888 }
00889
00895 static int decode_scale_factors(WMAProDecodeCtx* s)
00896 {
00897 int i;
00898
00903 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00904 int c = s->channel_indexes_for_cur_subframe[i];
00905 int* sf;
00906 int* sf_end;
00907 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
00908 sf_end = s->channel[c].scale_factors + s->num_bands;
00909
00915 if (s->channel[c].reuse_sf) {
00916 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
00917 int b;
00918 for (b = 0; b < s->num_bands; b++)
00919 s->channel[c].scale_factors[b] =
00920 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
00921 }
00922
00923 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
00924
00925 if (!s->channel[c].reuse_sf) {
00926 int val;
00928 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
00929 val = 45 / s->channel[c].scale_factor_step;
00930 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
00931 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
00932 *sf = val;
00933 }
00934 } else {
00935 int i;
00937 for (i = 0; i < s->num_bands; i++) {
00938 int idx;
00939 int skip;
00940 int val;
00941 int sign;
00942
00943 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
00944
00945 if (!idx) {
00946 uint32_t code = get_bits(&s->gb, 14);
00947 val = code >> 6;
00948 sign = (code & 1) - 1;
00949 skip = (code & 0x3f) >> 1;
00950 } else if (idx == 1) {
00951 break;
00952 } else {
00953 skip = scale_rl_run[idx];
00954 val = scale_rl_level[idx];
00955 sign = get_bits1(&s->gb)-1;
00956 }
00957
00958 i += skip;
00959 if (i >= s->num_bands) {
00960 av_log(s->avctx, AV_LOG_ERROR,
00961 "invalid scale factor coding\n");
00962 return AVERROR_INVALIDDATA;
00963 }
00964 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
00965 }
00966 }
00968 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
00969 s->channel[c].table_idx = s->table_idx;
00970 s->channel[c].reuse_sf = 1;
00971 }
00972
00974 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
00975 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
00976 s->channel[c].max_scale_factor =
00977 FFMAX(s->channel[c].max_scale_factor, *sf);
00978 }
00979
00980 }
00981 return 0;
00982 }
00983
00988 static void inverse_channel_transform(WMAProDecodeCtx *s)
00989 {
00990 int i;
00991
00992 for (i = 0; i < s->num_chgroups; i++) {
00993 if (s->chgroup[i].transform) {
00994 float data[WMAPRO_MAX_CHANNELS];
00995 const int num_channels = s->chgroup[i].num_channels;
00996 float** ch_data = s->chgroup[i].channel_data;
00997 float** ch_end = ch_data + num_channels;
00998 const int8_t* tb = s->chgroup[i].transform_band;
00999 int16_t* sfb;
01000
01002 for (sfb = s->cur_sfb_offsets;
01003 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
01004 int y;
01005 if (*tb++ == 1) {
01007 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
01008 const float* mat = s->chgroup[i].decorrelation_matrix;
01009 const float* data_end = data + num_channels;
01010 float* data_ptr = data;
01011 float** ch;
01012
01013 for (ch = ch_data; ch < ch_end; ch++)
01014 *data_ptr++ = (*ch)[y];
01015
01016 for (ch = ch_data; ch < ch_end; ch++) {
01017 float sum = 0;
01018 data_ptr = data;
01019 while (data_ptr < data_end)
01020 sum += *data_ptr++ * *mat++;
01021
01022 (*ch)[y] = sum;
01023 }
01024 }
01025 } else if (s->num_channels == 2) {
01026 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
01027 s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
01028 ch_data[0] + sfb[0],
01029 181.0 / 128, len);
01030 s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
01031 ch_data[1] + sfb[0],
01032 181.0 / 128, len);
01033 }
01034 }
01035 }
01036 }
01037 }
01038
01043 static void wmapro_window(WMAProDecodeCtx *s)
01044 {
01045 int i;
01046 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01047 int c = s->channel_indexes_for_cur_subframe[i];
01048 float* window;
01049 int winlen = s->channel[c].prev_block_len;
01050 float* start = s->channel[c].coeffs - (winlen >> 1);
01051
01052 if (s->subframe_len < winlen) {
01053 start += (winlen - s->subframe_len) >> 1;
01054 winlen = s->subframe_len;
01055 }
01056
01057 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
01058
01059 winlen >>= 1;
01060
01061 s->dsp.vector_fmul_window(start, start, start + winlen,
01062 window, winlen);
01063
01064 s->channel[c].prev_block_len = s->subframe_len;
01065 }
01066 }
01067
01073 static int decode_subframe(WMAProDecodeCtx *s)
01074 {
01075 int offset = s->samples_per_frame;
01076 int subframe_len = s->samples_per_frame;
01077 int i;
01078 int total_samples = s->samples_per_frame * s->num_channels;
01079 int transmit_coeffs = 0;
01080 int cur_subwoofer_cutoff;
01081
01082 s->subframe_offset = get_bits_count(&s->gb);
01083
01088 for (i = 0; i < s->num_channels; i++) {
01089 s->channel[i].grouped = 0;
01090 if (offset > s->channel[i].decoded_samples) {
01091 offset = s->channel[i].decoded_samples;
01092 subframe_len =
01093 s->channel[i].subframe_len[s->channel[i].cur_subframe];
01094 }
01095 }
01096
01097 av_dlog(s->avctx,
01098 "processing subframe with offset %i len %i\n", offset, subframe_len);
01099
01101 s->channels_for_cur_subframe = 0;
01102 for (i = 0; i < s->num_channels; i++) {
01103 const int cur_subframe = s->channel[i].cur_subframe;
01105 total_samples -= s->channel[i].decoded_samples;
01106
01108 if (offset == s->channel[i].decoded_samples &&
01109 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
01110 total_samples -= s->channel[i].subframe_len[cur_subframe];
01111 s->channel[i].decoded_samples +=
01112 s->channel[i].subframe_len[cur_subframe];
01113 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
01114 ++s->channels_for_cur_subframe;
01115 }
01116 }
01117
01120 if (!total_samples)
01121 s->parsed_all_subframes = 1;
01122
01123
01124 av_dlog(s->avctx, "subframe is part of %i channels\n",
01125 s->channels_for_cur_subframe);
01126
01128 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
01129 s->num_bands = s->num_sfb[s->table_idx];
01130 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
01131 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
01132
01134 offset += s->samples_per_frame >> 1;
01135
01136 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01137 int c = s->channel_indexes_for_cur_subframe[i];
01138
01139 s->channel[c].coeffs = &s->channel[c].out[offset];
01140 }
01141
01142 s->subframe_len = subframe_len;
01143 s->esc_len = av_log2(s->subframe_len - 1) + 1;
01144
01146 if (get_bits1(&s->gb)) {
01147 int num_fill_bits;
01148 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
01149 int len = get_bits(&s->gb, 4);
01150 num_fill_bits = get_bits(&s->gb, len) + 1;
01151 }
01152
01153 if (num_fill_bits >= 0) {
01154 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
01155 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
01156 return AVERROR_INVALIDDATA;
01157 }
01158
01159 skip_bits_long(&s->gb, num_fill_bits);
01160 }
01161 }
01162
01164 if (get_bits1(&s->gb)) {
01165 av_log_ask_for_sample(s->avctx, "reserved bit set\n");
01166 return AVERROR_INVALIDDATA;
01167 }
01168
01169
01170 if (decode_channel_transform(s) < 0)
01171 return AVERROR_INVALIDDATA;
01172
01173
01174 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01175 int c = s->channel_indexes_for_cur_subframe[i];
01176 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
01177 transmit_coeffs = 1;
01178 }
01179
01180 if (transmit_coeffs) {
01181 int step;
01182 int quant_step = 90 * s->bits_per_sample >> 4;
01183
01185 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
01186 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
01187 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01188 int c = s->channel_indexes_for_cur_subframe[i];
01189 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
01190 if (num_vec_coeffs + offset > FF_ARRAY_ELEMS(s->channel[c].out)) {
01191 av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
01192 return AVERROR_INVALIDDATA;
01193 }
01194 s->channel[c].num_vec_coeffs = num_vec_coeffs;
01195 }
01196 } else {
01197 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01198 int c = s->channel_indexes_for_cur_subframe[i];
01199 s->channel[c].num_vec_coeffs = s->subframe_len;
01200 }
01201 }
01203 step = get_sbits(&s->gb, 6);
01204 quant_step += step;
01205 if (step == -32 || step == 31) {
01206 const int sign = (step == 31) - 1;
01207 int quant = 0;
01208 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
01209 (step = get_bits(&s->gb, 5)) == 31) {
01210 quant += 31;
01211 }
01212 quant_step += ((quant + step) ^ sign) - sign;
01213 }
01214 if (quant_step < 0) {
01215 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
01216 }
01217
01220 if (s->channels_for_cur_subframe == 1) {
01221 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
01222 } else {
01223 int modifier_len = get_bits(&s->gb, 3);
01224 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01225 int c = s->channel_indexes_for_cur_subframe[i];
01226 s->channel[c].quant_step = quant_step;
01227 if (get_bits1(&s->gb)) {
01228 if (modifier_len) {
01229 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
01230 } else
01231 ++s->channel[c].quant_step;
01232 }
01233 }
01234 }
01235
01237 if (decode_scale_factors(s) < 0)
01238 return AVERROR_INVALIDDATA;
01239 }
01240
01241 av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
01242 get_bits_count(&s->gb) - s->subframe_offset);
01243
01245 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01246 int c = s->channel_indexes_for_cur_subframe[i];
01247 if (s->channel[c].transmit_coefs &&
01248 get_bits_count(&s->gb) < s->num_saved_bits) {
01249 decode_coeffs(s, c);
01250 } else
01251 memset(s->channel[c].coeffs, 0,
01252 sizeof(*s->channel[c].coeffs) * subframe_len);
01253 }
01254
01255 av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
01256 get_bits_count(&s->gb) - s->subframe_offset);
01257
01258 if (transmit_coeffs) {
01259 FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
01261 inverse_channel_transform(s);
01262 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01263 int c = s->channel_indexes_for_cur_subframe[i];
01264 const int* sf = s->channel[c].scale_factors;
01265 int b;
01266
01267 if (c == s->lfe_channel)
01268 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
01269 (subframe_len - cur_subwoofer_cutoff));
01270
01272 for (b = 0; b < s->num_bands; b++) {
01273 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
01274 const int exp = s->channel[c].quant_step -
01275 (s->channel[c].max_scale_factor - *sf++) *
01276 s->channel[c].scale_factor_step;
01277 const float quant = pow(10.0, exp / 20.0);
01278 int start = s->cur_sfb_offsets[b];
01279 s->dsp.vector_fmul_scalar(s->tmp + start,
01280 s->channel[c].coeffs + start,
01281 quant, end - start);
01282 }
01283
01285 mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
01286 }
01287 }
01288
01290 wmapro_window(s);
01291
01293 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01294 int c = s->channel_indexes_for_cur_subframe[i];
01295 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
01296 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
01297 return AVERROR_INVALIDDATA;
01298 }
01299 ++s->channel[c].cur_subframe;
01300 }
01301
01302 return 0;
01303 }
01304
01311 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
01312 {
01313 AVCodecContext *avctx = s->avctx;
01314 GetBitContext* gb = &s->gb;
01315 int more_frames = 0;
01316 int len = 0;
01317 int i, ret;
01318 const float *out_ptr[WMAPRO_MAX_CHANNELS];
01319 float *samples;
01320
01322 if (s->len_prefix)
01323 len = get_bits(gb, s->log2_frame_size);
01324
01325 av_dlog(s->avctx, "decoding frame with length %x\n", len);
01326
01328 if (decode_tilehdr(s)) {
01329 s->packet_loss = 1;
01330 return 0;
01331 }
01332
01334 if (s->num_channels > 1 && get_bits1(gb)) {
01335 if (get_bits1(gb)) {
01336 for (i = 0; i < s->num_channels * s->num_channels; i++)
01337 skip_bits(gb, 4);
01338 }
01339 }
01340
01342 if (s->dynamic_range_compression) {
01343 s->drc_gain = get_bits(gb, 8);
01344 av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
01345 }
01346
01349 if (get_bits1(gb)) {
01350 int av_unused skip;
01351
01353 if (get_bits1(gb)) {
01354 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01355 av_dlog(s->avctx, "start skip: %i\n", skip);
01356 }
01357
01359 if (get_bits1(gb)) {
01360 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01361 av_dlog(s->avctx, "end skip: %i\n", skip);
01362 }
01363
01364 }
01365
01366 av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
01367 get_bits_count(gb) - s->frame_offset);
01368
01370 s->parsed_all_subframes = 0;
01371 for (i = 0; i < s->num_channels; i++) {
01372 s->channel[i].decoded_samples = 0;
01373 s->channel[i].cur_subframe = 0;
01374 s->channel[i].reuse_sf = 0;
01375 }
01376
01378 while (!s->parsed_all_subframes) {
01379 if (decode_subframe(s) < 0) {
01380 s->packet_loss = 1;
01381 return 0;
01382 }
01383 }
01384
01385
01386 s->frame.nb_samples = s->samples_per_frame;
01387 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
01388 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01389 s->packet_loss = 1;
01390 return 0;
01391 }
01392 samples = (float *)s->frame.data[0];
01393
01395 for (i = 0; i < s->num_channels; i++)
01396 out_ptr[i] = s->channel[i].out;
01397 s->fmt_conv.float_interleave(samples, out_ptr, s->samples_per_frame,
01398 s->num_channels);
01399
01400 for (i = 0; i < s->num_channels; i++) {
01402 memcpy(&s->channel[i].out[0],
01403 &s->channel[i].out[s->samples_per_frame],
01404 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
01405 }
01406
01407 if (s->skip_frame) {
01408 s->skip_frame = 0;
01409 *got_frame_ptr = 0;
01410 } else {
01411 *got_frame_ptr = 1;
01412 }
01413
01414 if (s->len_prefix) {
01415 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
01417 av_log(s->avctx, AV_LOG_ERROR,
01418 "frame[%i] would have to skip %i bits\n", s->frame_num,
01419 len - (get_bits_count(gb) - s->frame_offset) - 1);
01420 s->packet_loss = 1;
01421 return 0;
01422 }
01423
01425 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
01426 } else {
01427 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
01428 }
01429 }
01430
01432 more_frames = get_bits1(gb);
01433
01434 ++s->frame_num;
01435 return more_frames;
01436 }
01437
01444 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
01445 {
01446 return s->buf_bit_size - get_bits_count(gb);
01447 }
01448
01456 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
01457 int append)
01458 {
01459 int buflen;
01460
01465 if (!append) {
01466 s->frame_offset = get_bits_count(gb) & 7;
01467 s->num_saved_bits = s->frame_offset;
01468 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
01469 }
01470
01471 buflen = (s->num_saved_bits + len + 8) >> 3;
01472
01473 if (len <= 0 || buflen > MAX_FRAMESIZE) {
01474 av_log_ask_for_sample(s->avctx, "input buffer too small\n");
01475 s->packet_loss = 1;
01476 return;
01477 }
01478
01479 if (len > put_bits_left(&s->pb)) {
01480 av_log(s->avctx, AV_LOG_ERROR,
01481 "Cannot append %d bits, only %d bits available.\n",
01482 len, put_bits_left(&s->pb));
01483 s->packet_loss = 1;
01484 return;
01485 }
01486
01487 s->num_saved_bits += len;
01488 if (!append) {
01489 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
01490 s->num_saved_bits);
01491 } else {
01492 int align = 8 - (get_bits_count(gb) & 7);
01493 align = FFMIN(align, len);
01494 put_bits(&s->pb, align, get_bits(gb, align));
01495 len -= align;
01496 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
01497 }
01498 skip_bits_long(gb, len);
01499
01500 {
01501 PutBitContext tmp = s->pb;
01502 flush_put_bits(&tmp);
01503 }
01504
01505 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
01506 skip_bits(&s->gb, s->frame_offset);
01507 }
01508
01517 static int decode_packet(AVCodecContext *avctx, void *data,
01518 int *got_frame_ptr, AVPacket* avpkt)
01519 {
01520 WMAProDecodeCtx *s = avctx->priv_data;
01521 GetBitContext* gb = &s->pgb;
01522 const uint8_t* buf = avpkt->data;
01523 int buf_size = avpkt->size;
01524 int num_bits_prev_frame;
01525 int packet_sequence_number;
01526
01527 *got_frame_ptr = 0;
01528
01529 if (s->packet_done || s->packet_loss) {
01530 s->packet_done = 0;
01531
01533 if (buf_size < avctx->block_align) {
01534 av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
01535 buf_size, avctx->block_align);
01536 return AVERROR_INVALIDDATA;
01537 }
01538
01539 s->next_packet_start = buf_size - avctx->block_align;
01540 buf_size = avctx->block_align;
01541 s->buf_bit_size = buf_size << 3;
01542
01544 init_get_bits(gb, buf, s->buf_bit_size);
01545 packet_sequence_number = get_bits(gb, 4);
01546 skip_bits(gb, 2);
01547
01549 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
01550 av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
01551 num_bits_prev_frame);
01552
01554 if (!s->packet_loss &&
01555 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
01556 s->packet_loss = 1;
01557 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
01558 s->packet_sequence_number, packet_sequence_number);
01559 }
01560 s->packet_sequence_number = packet_sequence_number;
01561
01562 if (num_bits_prev_frame > 0) {
01563 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
01564 if (num_bits_prev_frame >= remaining_packet_bits) {
01565 num_bits_prev_frame = remaining_packet_bits;
01566 s->packet_done = 1;
01567 }
01568
01571 save_bits(s, gb, num_bits_prev_frame, 1);
01572 av_dlog(avctx, "accumulated %x bits of frame data\n",
01573 s->num_saved_bits - s->frame_offset);
01574
01576 if (!s->packet_loss)
01577 decode_frame(s, got_frame_ptr);
01578 } else if (s->num_saved_bits - s->frame_offset) {
01579 av_dlog(avctx, "ignoring %x previously saved bits\n",
01580 s->num_saved_bits - s->frame_offset);
01581 }
01582
01583 if (s->packet_loss) {
01587 s->num_saved_bits = 0;
01588 s->packet_loss = 0;
01589 }
01590
01591 } else {
01592 int frame_size;
01593 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
01594 init_get_bits(gb, avpkt->data, s->buf_bit_size);
01595 skip_bits(gb, s->packet_offset);
01596 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
01597 (frame_size = show_bits(gb, s->log2_frame_size)) &&
01598 frame_size <= remaining_bits(s, gb)) {
01599 save_bits(s, gb, frame_size, 0);
01600 s->packet_done = !decode_frame(s, got_frame_ptr);
01601 } else if (!s->len_prefix
01602 && s->num_saved_bits > get_bits_count(&s->gb)) {
01610 s->packet_done = !decode_frame(s, got_frame_ptr);
01611 } else
01612 s->packet_done = 1;
01613 }
01614
01615 if (s->packet_done && !s->packet_loss &&
01616 remaining_bits(s, gb) > 0) {
01619 save_bits(s, gb, remaining_bits(s, gb), 0);
01620 }
01621
01622 s->packet_offset = get_bits_count(gb) & 7;
01623 if (s->packet_loss)
01624 return AVERROR_INVALIDDATA;
01625
01626 if (*got_frame_ptr)
01627 *(AVFrame *)data = s->frame;
01628
01629 return get_bits_count(gb) >> 3;
01630 }
01631
01636 static void flush(AVCodecContext *avctx)
01637 {
01638 WMAProDecodeCtx *s = avctx->priv_data;
01639 int i;
01642 for (i = 0; i < s->num_channels; i++)
01643 memset(s->channel[i].out, 0, s->samples_per_frame *
01644 sizeof(*s->channel[i].out));
01645 s->packet_loss = 1;
01646 }
01647
01648
01652 AVCodec ff_wmapro_decoder = {
01653 .name = "wmapro",
01654 .type = AVMEDIA_TYPE_AUDIO,
01655 .id = CODEC_ID_WMAPRO,
01656 .priv_data_size = sizeof(WMAProDecodeCtx),
01657 .init = decode_init,
01658 .close = decode_end,
01659 .decode = decode_packet,
01660 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
01661 .flush= flush,
01662 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
01663 };