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00027 #include "libavutil/avassert.h"
00028 #include "libavutil/channel_layout.h"
00029 #include "libavutil/libm.h"
00030 #include "avcodec.h"
00031 #include "get_bits.h"
00032 #include "internal.h"
00033 #include "mathops.h"
00034 #include "mpegaudiodsp.h"
00035 #include "dsputil.h"
00036
00037
00038
00039
00040
00041
00042 #include "mpegaudio.h"
00043 #include "mpegaudiodecheader.h"
00044
00045 #define BACKSTEP_SIZE 512
00046 #define EXTRABYTES 24
00047 #define LAST_BUF_SIZE 2 * BACKSTEP_SIZE + EXTRABYTES
00048
00049
00050 typedef struct GranuleDef {
00051 uint8_t scfsi;
00052 int part2_3_length;
00053 int big_values;
00054 int global_gain;
00055 int scalefac_compress;
00056 uint8_t block_type;
00057 uint8_t switch_point;
00058 int table_select[3];
00059 int subblock_gain[3];
00060 uint8_t scalefac_scale;
00061 uint8_t count1table_select;
00062 int region_size[3];
00063 int preflag;
00064 int short_start, long_end;
00065 uint8_t scale_factors[40];
00066 DECLARE_ALIGNED(16, INTFLOAT, sb_hybrid)[SBLIMIT * 18];
00067 } GranuleDef;
00068
00069 typedef struct MPADecodeContext {
00070 MPA_DECODE_HEADER
00071 uint8_t last_buf[LAST_BUF_SIZE];
00072 int last_buf_size;
00073
00074 uint32_t free_format_next_header;
00075 GetBitContext gb;
00076 GetBitContext in_gb;
00077 DECLARE_ALIGNED(32, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512 * 2];
00078 int synth_buf_offset[MPA_MAX_CHANNELS];
00079 DECLARE_ALIGNED(32, INTFLOAT, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
00080 INTFLOAT mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18];
00081 GranuleDef granules[2][2];
00082 int adu_mode;
00083 int dither_state;
00084 int err_recognition;
00085 AVCodecContext* avctx;
00086 MPADSPContext mpadsp;
00087 DSPContext dsp;
00088 AVFrame frame;
00089 } MPADecodeContext;
00090
00091 #if CONFIG_FLOAT
00092 # define SHR(a,b) ((a)*(1.0f/(1<<(b))))
00093 # define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5))
00094 # define FIXR(x) ((float)(x))
00095 # define FIXHR(x) ((float)(x))
00096 # define MULH3(x, y, s) ((s)*(y)*(x))
00097 # define MULLx(x, y, s) ((y)*(x))
00098 # define RENAME(a) a ## _float
00099 # define OUT_FMT AV_SAMPLE_FMT_FLT
00100 # define OUT_FMT_P AV_SAMPLE_FMT_FLTP
00101 #else
00102 # define SHR(a,b) ((a)>>(b))
00103
00104 # define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5))
00105 # define FIXR(a) ((int)((a) * FRAC_ONE + 0.5))
00106 # define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5))
00107 # define MULH3(x, y, s) MULH((s)*(x), y)
00108 # define MULLx(x, y, s) MULL(x,y,s)
00109 # define RENAME(a) a ## _fixed
00110 # define OUT_FMT AV_SAMPLE_FMT_S16
00111 # define OUT_FMT_P AV_SAMPLE_FMT_S16P
00112 #endif
00113
00114
00115
00116 #define HEADER_SIZE 4
00117
00118 #include "mpegaudiodata.h"
00119 #include "mpegaudiodectab.h"
00120
00121
00122 static VLC huff_vlc[16];
00123 static VLC_TYPE huff_vlc_tables[
00124 0 + 128 + 128 + 128 + 130 + 128 + 154 + 166 +
00125 142 + 204 + 190 + 170 + 542 + 460 + 662 + 414
00126 ][2];
00127 static const int huff_vlc_tables_sizes[16] = {
00128 0, 128, 128, 128, 130, 128, 154, 166,
00129 142, 204, 190, 170, 542, 460, 662, 414
00130 };
00131 static VLC huff_quad_vlc[2];
00132 static VLC_TYPE huff_quad_vlc_tables[128+16][2];
00133 static const int huff_quad_vlc_tables_sizes[2] = { 128, 16 };
00134
00135 static uint16_t band_index_long[9][23];
00136 #include "mpegaudio_tablegen.h"
00137
00138 static INTFLOAT is_table[2][16];
00139 static INTFLOAT is_table_lsf[2][2][16];
00140 static INTFLOAT csa_table[8][4];
00141
00142 static int16_t division_tab3[1<<6 ];
00143 static int16_t division_tab5[1<<8 ];
00144 static int16_t division_tab9[1<<11];
00145
00146 static int16_t * const division_tabs[4] = {
00147 division_tab3, division_tab5, NULL, division_tab9
00148 };
00149
00150
00151 static uint16_t scale_factor_modshift[64];
00152
00153 static int32_t scale_factor_mult[15][3];
00154
00155
00156 #define SCALE_GEN(v) \
00157 { FIXR_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (v)) }
00158
00159 static const int32_t scale_factor_mult2[3][3] = {
00160 SCALE_GEN(4.0 / 3.0),
00161 SCALE_GEN(4.0 / 5.0),
00162 SCALE_GEN(4.0 / 9.0),
00163 };
00164
00169 static void ff_region_offset2size(GranuleDef *g)
00170 {
00171 int i, k, j = 0;
00172 g->region_size[2] = 576 / 2;
00173 for (i = 0; i < 3; i++) {
00174 k = FFMIN(g->region_size[i], g->big_values);
00175 g->region_size[i] = k - j;
00176 j = k;
00177 }
00178 }
00179
00180 static void ff_init_short_region(MPADecodeContext *s, GranuleDef *g)
00181 {
00182 if (g->block_type == 2) {
00183 if (s->sample_rate_index != 8)
00184 g->region_size[0] = (36 / 2);
00185 else
00186 g->region_size[0] = (72 / 2);
00187 } else {
00188 if (s->sample_rate_index <= 2)
00189 g->region_size[0] = (36 / 2);
00190 else if (s->sample_rate_index != 8)
00191 g->region_size[0] = (54 / 2);
00192 else
00193 g->region_size[0] = (108 / 2);
00194 }
00195 g->region_size[1] = (576 / 2);
00196 }
00197
00198 static void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2)
00199 {
00200 int l;
00201 g->region_size[0] = band_index_long[s->sample_rate_index][ra1 + 1] >> 1;
00202
00203 l = FFMIN(ra1 + ra2 + 2, 22);
00204 g->region_size[1] = band_index_long[s->sample_rate_index][ l] >> 1;
00205 }
00206
00207 static void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g)
00208 {
00209 if (g->block_type == 2) {
00210 if (g->switch_point) {
00211 if(s->sample_rate_index == 8)
00212 av_log_ask_for_sample(s->avctx, "switch point in 8khz\n");
00213
00214
00215
00216 if (s->sample_rate_index <= 2)
00217 g->long_end = 8;
00218 else
00219 g->long_end = 6;
00220
00221 g->short_start = 3;
00222 } else {
00223 g->long_end = 0;
00224 g->short_start = 0;
00225 }
00226 } else {
00227 g->short_start = 13;
00228 g->long_end = 22;
00229 }
00230 }
00231
00232
00233
00234 static inline int l1_unscale(int n, int mant, int scale_factor)
00235 {
00236 int shift, mod;
00237 int64_t val;
00238
00239 shift = scale_factor_modshift[scale_factor];
00240 mod = shift & 3;
00241 shift >>= 2;
00242 val = MUL64(mant + (-1 << n) + 1, scale_factor_mult[n-1][mod]);
00243 shift += n;
00244
00245 return (int)((val + (1LL << (shift - 1))) >> shift);
00246 }
00247
00248 static inline int l2_unscale_group(int steps, int mant, int scale_factor)
00249 {
00250 int shift, mod, val;
00251
00252 shift = scale_factor_modshift[scale_factor];
00253 mod = shift & 3;
00254 shift >>= 2;
00255
00256 val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
00257
00258 if (shift > 0)
00259 val = (val + (1 << (shift - 1))) >> shift;
00260 return val;
00261 }
00262
00263
00264 static inline int l3_unscale(int value, int exponent)
00265 {
00266 unsigned int m;
00267 int e;
00268
00269 e = table_4_3_exp [4 * value + (exponent & 3)];
00270 m = table_4_3_value[4 * value + (exponent & 3)];
00271 e -= exponent >> 2;
00272 #ifdef DEBUG
00273 if(e < 1)
00274 av_log(NULL, AV_LOG_WARNING, "l3_unscale: e is %d\n", e);
00275 #endif
00276 if (e > 31)
00277 return 0;
00278 m = (m + (1 << (e - 1))) >> e;
00279
00280 return m;
00281 }
00282
00283 static av_cold void decode_init_static(void)
00284 {
00285 int i, j, k;
00286 int offset;
00287
00288
00289 for (i = 0; i < 64; i++) {
00290 int shift, mod;
00291
00292 shift = i / 3;
00293 mod = i % 3;
00294 scale_factor_modshift[i] = mod | (shift << 2);
00295 }
00296
00297
00298 for (i = 0; i < 15; i++) {
00299 int n, norm;
00300 n = i + 2;
00301 norm = ((INT64_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
00302 scale_factor_mult[i][0] = MULLx(norm, FIXR(1.0 * 2.0), FRAC_BITS);
00303 scale_factor_mult[i][1] = MULLx(norm, FIXR(0.7937005259 * 2.0), FRAC_BITS);
00304 scale_factor_mult[i][2] = MULLx(norm, FIXR(0.6299605249 * 2.0), FRAC_BITS);
00305 av_dlog(NULL, "%d: norm=%x s=%x %x %x\n", i, norm,
00306 scale_factor_mult[i][0],
00307 scale_factor_mult[i][1],
00308 scale_factor_mult[i][2]);
00309 }
00310
00311 RENAME(ff_mpa_synth_init)(RENAME(ff_mpa_synth_window));
00312
00313
00314 offset = 0;
00315 for (i = 1; i < 16; i++) {
00316 const HuffTable *h = &mpa_huff_tables[i];
00317 int xsize, x, y;
00318 uint8_t tmp_bits [512] = { 0 };
00319 uint16_t tmp_codes[512] = { 0 };
00320
00321 xsize = h->xsize;
00322
00323 j = 0;
00324 for (x = 0; x < xsize; x++) {
00325 for (y = 0; y < xsize; y++) {
00326 tmp_bits [(x << 5) | y | ((x&&y)<<4)]= h->bits [j ];
00327 tmp_codes[(x << 5) | y | ((x&&y)<<4)]= h->codes[j++];
00328 }
00329 }
00330
00331
00332 huff_vlc[i].table = huff_vlc_tables+offset;
00333 huff_vlc[i].table_allocated = huff_vlc_tables_sizes[i];
00334 init_vlc(&huff_vlc[i], 7, 512,
00335 tmp_bits, 1, 1, tmp_codes, 2, 2,
00336 INIT_VLC_USE_NEW_STATIC);
00337 offset += huff_vlc_tables_sizes[i];
00338 }
00339 av_assert0(offset == FF_ARRAY_ELEMS(huff_vlc_tables));
00340
00341 offset = 0;
00342 for (i = 0; i < 2; i++) {
00343 huff_quad_vlc[i].table = huff_quad_vlc_tables+offset;
00344 huff_quad_vlc[i].table_allocated = huff_quad_vlc_tables_sizes[i];
00345 init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
00346 mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1,
00347 INIT_VLC_USE_NEW_STATIC);
00348 offset += huff_quad_vlc_tables_sizes[i];
00349 }
00350 av_assert0(offset == FF_ARRAY_ELEMS(huff_quad_vlc_tables));
00351
00352 for (i = 0; i < 9; i++) {
00353 k = 0;
00354 for (j = 0; j < 22; j++) {
00355 band_index_long[i][j] = k;
00356 k += band_size_long[i][j];
00357 }
00358 band_index_long[i][22] = k;
00359 }
00360
00361
00362
00363 mpegaudio_tableinit();
00364
00365 for (i = 0; i < 4; i++) {
00366 if (ff_mpa_quant_bits[i] < 0) {
00367 for (j = 0; j < (1 << (-ff_mpa_quant_bits[i]+1)); j++) {
00368 int val1, val2, val3, steps;
00369 int val = j;
00370 steps = ff_mpa_quant_steps[i];
00371 val1 = val % steps;
00372 val /= steps;
00373 val2 = val % steps;
00374 val3 = val / steps;
00375 division_tabs[i][j] = val1 + (val2 << 4) + (val3 << 8);
00376 }
00377 }
00378 }
00379
00380
00381 for (i = 0; i < 7; i++) {
00382 float f;
00383 INTFLOAT v;
00384 if (i != 6) {
00385 f = tan((double)i * M_PI / 12.0);
00386 v = FIXR(f / (1.0 + f));
00387 } else {
00388 v = FIXR(1.0);
00389 }
00390 is_table[0][ i] = v;
00391 is_table[1][6 - i] = v;
00392 }
00393
00394 for (i = 7; i < 16; i++)
00395 is_table[0][i] = is_table[1][i] = 0.0;
00396
00397 for (i = 0; i < 16; i++) {
00398 double f;
00399 int e, k;
00400
00401 for (j = 0; j < 2; j++) {
00402 e = -(j + 1) * ((i + 1) >> 1);
00403 f = exp2(e / 4.0);
00404 k = i & 1;
00405 is_table_lsf[j][k ^ 1][i] = FIXR(f);
00406 is_table_lsf[j][k ][i] = FIXR(1.0);
00407 av_dlog(NULL, "is_table_lsf %d %d: %f %f\n",
00408 i, j, (float) is_table_lsf[j][0][i],
00409 (float) is_table_lsf[j][1][i]);
00410 }
00411 }
00412
00413 for (i = 0; i < 8; i++) {
00414 float ci, cs, ca;
00415 ci = ci_table[i];
00416 cs = 1.0 / sqrt(1.0 + ci * ci);
00417 ca = cs * ci;
00418 #if !CONFIG_FLOAT
00419 csa_table[i][0] = FIXHR(cs/4);
00420 csa_table[i][1] = FIXHR(ca/4);
00421 csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
00422 csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
00423 #else
00424 csa_table[i][0] = cs;
00425 csa_table[i][1] = ca;
00426 csa_table[i][2] = ca + cs;
00427 csa_table[i][3] = ca - cs;
00428 #endif
00429 }
00430 }
00431
00432 static av_cold int decode_init(AVCodecContext * avctx)
00433 {
00434 static int initialized_tables = 0;
00435 MPADecodeContext *s = avctx->priv_data;
00436
00437 if (!initialized_tables) {
00438 decode_init_static();
00439 initialized_tables = 1;
00440 }
00441
00442 s->avctx = avctx;
00443
00444 ff_mpadsp_init(&s->mpadsp);
00445 ff_dsputil_init(&s->dsp, avctx);
00446
00447 if (avctx->request_sample_fmt == OUT_FMT &&
00448 avctx->codec_id != AV_CODEC_ID_MP3ON4)
00449 avctx->sample_fmt = OUT_FMT;
00450 else
00451 avctx->sample_fmt = OUT_FMT_P;
00452 s->err_recognition = avctx->err_recognition;
00453
00454 if (avctx->codec_id == AV_CODEC_ID_MP3ADU)
00455 s->adu_mode = 1;
00456
00457 avcodec_get_frame_defaults(&s->frame);
00458 avctx->coded_frame = &s->frame;
00459
00460 return 0;
00461 }
00462
00463 #define C3 FIXHR(0.86602540378443864676/2)
00464 #define C4 FIXHR(0.70710678118654752439/2) //0.5 / cos(pi*(9)/36)
00465 #define C5 FIXHR(0.51763809020504152469/2) //0.5 / cos(pi*(5)/36)
00466 #define C6 FIXHR(1.93185165257813657349/4) //0.5 / cos(pi*(15)/36)
00467
00468
00469
00470 static void imdct12(INTFLOAT *out, INTFLOAT *in)
00471 {
00472 INTFLOAT in0, in1, in2, in3, in4, in5, t1, t2;
00473
00474 in0 = in[0*3];
00475 in1 = in[1*3] + in[0*3];
00476 in2 = in[2*3] + in[1*3];
00477 in3 = in[3*3] + in[2*3];
00478 in4 = in[4*3] + in[3*3];
00479 in5 = in[5*3] + in[4*3];
00480 in5 += in3;
00481 in3 += in1;
00482
00483 in2 = MULH3(in2, C3, 2);
00484 in3 = MULH3(in3, C3, 4);
00485
00486 t1 = in0 - in4;
00487 t2 = MULH3(in1 - in5, C4, 2);
00488
00489 out[ 7] =
00490 out[10] = t1 + t2;
00491 out[ 1] =
00492 out[ 4] = t1 - t2;
00493
00494 in0 += SHR(in4, 1);
00495 in4 = in0 + in2;
00496 in5 += 2*in1;
00497 in1 = MULH3(in5 + in3, C5, 1);
00498 out[ 8] =
00499 out[ 9] = in4 + in1;
00500 out[ 2] =
00501 out[ 3] = in4 - in1;
00502
00503 in0 -= in2;
00504 in5 = MULH3(in5 - in3, C6, 2);
00505 out[ 0] =
00506 out[ 5] = in0 - in5;
00507 out[ 6] =
00508 out[11] = in0 + in5;
00509 }
00510
00511
00512 static int mp_decode_layer1(MPADecodeContext *s)
00513 {
00514 int bound, i, v, n, ch, j, mant;
00515 uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
00516 uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
00517
00518 if (s->mode == MPA_JSTEREO)
00519 bound = (s->mode_ext + 1) * 4;
00520 else
00521 bound = SBLIMIT;
00522
00523
00524 for (i = 0; i < bound; i++) {
00525 for (ch = 0; ch < s->nb_channels; ch++) {
00526 allocation[ch][i] = get_bits(&s->gb, 4);
00527 }
00528 }
00529 for (i = bound; i < SBLIMIT; i++)
00530 allocation[0][i] = get_bits(&s->gb, 4);
00531
00532
00533 for (i = 0; i < bound; i++) {
00534 for (ch = 0; ch < s->nb_channels; ch++) {
00535 if (allocation[ch][i])
00536 scale_factors[ch][i] = get_bits(&s->gb, 6);
00537 }
00538 }
00539 for (i = bound; i < SBLIMIT; i++) {
00540 if (allocation[0][i]) {
00541 scale_factors[0][i] = get_bits(&s->gb, 6);
00542 scale_factors[1][i] = get_bits(&s->gb, 6);
00543 }
00544 }
00545
00546
00547 for (j = 0; j < 12; j++) {
00548 for (i = 0; i < bound; i++) {
00549 for (ch = 0; ch < s->nb_channels; ch++) {
00550 n = allocation[ch][i];
00551 if (n) {
00552 mant = get_bits(&s->gb, n + 1);
00553 v = l1_unscale(n, mant, scale_factors[ch][i]);
00554 } else {
00555 v = 0;
00556 }
00557 s->sb_samples[ch][j][i] = v;
00558 }
00559 }
00560 for (i = bound; i < SBLIMIT; i++) {
00561 n = allocation[0][i];
00562 if (n) {
00563 mant = get_bits(&s->gb, n + 1);
00564 v = l1_unscale(n, mant, scale_factors[0][i]);
00565 s->sb_samples[0][j][i] = v;
00566 v = l1_unscale(n, mant, scale_factors[1][i]);
00567 s->sb_samples[1][j][i] = v;
00568 } else {
00569 s->sb_samples[0][j][i] = 0;
00570 s->sb_samples[1][j][i] = 0;
00571 }
00572 }
00573 }
00574 return 12;
00575 }
00576
00577 static int mp_decode_layer2(MPADecodeContext *s)
00578 {
00579 int sblimit;
00580 const unsigned char *alloc_table;
00581 int table, bit_alloc_bits, i, j, ch, bound, v;
00582 unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
00583 unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
00584 unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
00585 int scale, qindex, bits, steps, k, l, m, b;
00586
00587
00588 table = ff_mpa_l2_select_table(s->bit_rate / 1000, s->nb_channels,
00589 s->sample_rate, s->lsf);
00590 sblimit = ff_mpa_sblimit_table[table];
00591 alloc_table = ff_mpa_alloc_tables[table];
00592
00593 if (s->mode == MPA_JSTEREO)
00594 bound = (s->mode_ext + 1) * 4;
00595 else
00596 bound = sblimit;
00597
00598 av_dlog(s->avctx, "bound=%d sblimit=%d\n", bound, sblimit);
00599
00600
00601 if (bound > sblimit)
00602 bound = sblimit;
00603
00604
00605 j = 0;
00606 for (i = 0; i < bound; i++) {
00607 bit_alloc_bits = alloc_table[j];
00608 for (ch = 0; ch < s->nb_channels; ch++)
00609 bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
00610 j += 1 << bit_alloc_bits;
00611 }
00612 for (i = bound; i < sblimit; i++) {
00613 bit_alloc_bits = alloc_table[j];
00614 v = get_bits(&s->gb, bit_alloc_bits);
00615 bit_alloc[0][i] = v;
00616 bit_alloc[1][i] = v;
00617 j += 1 << bit_alloc_bits;
00618 }
00619
00620
00621 for (i = 0; i < sblimit; i++) {
00622 for (ch = 0; ch < s->nb_channels; ch++) {
00623 if (bit_alloc[ch][i])
00624 scale_code[ch][i] = get_bits(&s->gb, 2);
00625 }
00626 }
00627
00628
00629 for (i = 0; i < sblimit; i++) {
00630 for (ch = 0; ch < s->nb_channels; ch++) {
00631 if (bit_alloc[ch][i]) {
00632 sf = scale_factors[ch][i];
00633 switch (scale_code[ch][i]) {
00634 default:
00635 case 0:
00636 sf[0] = get_bits(&s->gb, 6);
00637 sf[1] = get_bits(&s->gb, 6);
00638 sf[2] = get_bits(&s->gb, 6);
00639 break;
00640 case 2:
00641 sf[0] = get_bits(&s->gb, 6);
00642 sf[1] = sf[0];
00643 sf[2] = sf[0];
00644 break;
00645 case 1:
00646 sf[0] = get_bits(&s->gb, 6);
00647 sf[2] = get_bits(&s->gb, 6);
00648 sf[1] = sf[0];
00649 break;
00650 case 3:
00651 sf[0] = get_bits(&s->gb, 6);
00652 sf[2] = get_bits(&s->gb, 6);
00653 sf[1] = sf[2];
00654 break;
00655 }
00656 }
00657 }
00658 }
00659
00660
00661 for (k = 0; k < 3; k++) {
00662 for (l = 0; l < 12; l += 3) {
00663 j = 0;
00664 for (i = 0; i < bound; i++) {
00665 bit_alloc_bits = alloc_table[j];
00666 for (ch = 0; ch < s->nb_channels; ch++) {
00667 b = bit_alloc[ch][i];
00668 if (b) {
00669 scale = scale_factors[ch][i][k];
00670 qindex = alloc_table[j+b];
00671 bits = ff_mpa_quant_bits[qindex];
00672 if (bits < 0) {
00673 int v2;
00674
00675 v = get_bits(&s->gb, -bits);
00676 v2 = division_tabs[qindex][v];
00677 steps = ff_mpa_quant_steps[qindex];
00678
00679 s->sb_samples[ch][k * 12 + l + 0][i] =
00680 l2_unscale_group(steps, v2 & 15, scale);
00681 s->sb_samples[ch][k * 12 + l + 1][i] =
00682 l2_unscale_group(steps, (v2 >> 4) & 15, scale);
00683 s->sb_samples[ch][k * 12 + l + 2][i] =
00684 l2_unscale_group(steps, v2 >> 8 , scale);
00685 } else {
00686 for (m = 0; m < 3; m++) {
00687 v = get_bits(&s->gb, bits);
00688 v = l1_unscale(bits - 1, v, scale);
00689 s->sb_samples[ch][k * 12 + l + m][i] = v;
00690 }
00691 }
00692 } else {
00693 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
00694 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
00695 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
00696 }
00697 }
00698
00699 j += 1 << bit_alloc_bits;
00700 }
00701
00702 for (i = bound; i < sblimit; i++) {
00703 bit_alloc_bits = alloc_table[j];
00704 b = bit_alloc[0][i];
00705 if (b) {
00706 int mant, scale0, scale1;
00707 scale0 = scale_factors[0][i][k];
00708 scale1 = scale_factors[1][i][k];
00709 qindex = alloc_table[j+b];
00710 bits = ff_mpa_quant_bits[qindex];
00711 if (bits < 0) {
00712
00713 v = get_bits(&s->gb, -bits);
00714 steps = ff_mpa_quant_steps[qindex];
00715 mant = v % steps;
00716 v = v / steps;
00717 s->sb_samples[0][k * 12 + l + 0][i] =
00718 l2_unscale_group(steps, mant, scale0);
00719 s->sb_samples[1][k * 12 + l + 0][i] =
00720 l2_unscale_group(steps, mant, scale1);
00721 mant = v % steps;
00722 v = v / steps;
00723 s->sb_samples[0][k * 12 + l + 1][i] =
00724 l2_unscale_group(steps, mant, scale0);
00725 s->sb_samples[1][k * 12 + l + 1][i] =
00726 l2_unscale_group(steps, mant, scale1);
00727 s->sb_samples[0][k * 12 + l + 2][i] =
00728 l2_unscale_group(steps, v, scale0);
00729 s->sb_samples[1][k * 12 + l + 2][i] =
00730 l2_unscale_group(steps, v, scale1);
00731 } else {
00732 for (m = 0; m < 3; m++) {
00733 mant = get_bits(&s->gb, bits);
00734 s->sb_samples[0][k * 12 + l + m][i] =
00735 l1_unscale(bits - 1, mant, scale0);
00736 s->sb_samples[1][k * 12 + l + m][i] =
00737 l1_unscale(bits - 1, mant, scale1);
00738 }
00739 }
00740 } else {
00741 s->sb_samples[0][k * 12 + l + 0][i] = 0;
00742 s->sb_samples[0][k * 12 + l + 1][i] = 0;
00743 s->sb_samples[0][k * 12 + l + 2][i] = 0;
00744 s->sb_samples[1][k * 12 + l + 0][i] = 0;
00745 s->sb_samples[1][k * 12 + l + 1][i] = 0;
00746 s->sb_samples[1][k * 12 + l + 2][i] = 0;
00747 }
00748
00749 j += 1 << bit_alloc_bits;
00750 }
00751
00752 for (i = sblimit; i < SBLIMIT; i++) {
00753 for (ch = 0; ch < s->nb_channels; ch++) {
00754 s->sb_samples[ch][k * 12 + l + 0][i] = 0;
00755 s->sb_samples[ch][k * 12 + l + 1][i] = 0;
00756 s->sb_samples[ch][k * 12 + l + 2][i] = 0;
00757 }
00758 }
00759 }
00760 }
00761 return 3 * 12;
00762 }
00763
00764 #define SPLIT(dst,sf,n) \
00765 if (n == 3) { \
00766 int m = (sf * 171) >> 9; \
00767 dst = sf - 3 * m; \
00768 sf = m; \
00769 } else if (n == 4) { \
00770 dst = sf & 3; \
00771 sf >>= 2; \
00772 } else if (n == 5) { \
00773 int m = (sf * 205) >> 10; \
00774 dst = sf - 5 * m; \
00775 sf = m; \
00776 } else if (n == 6) { \
00777 int m = (sf * 171) >> 10; \
00778 dst = sf - 6 * m; \
00779 sf = m; \
00780 } else { \
00781 dst = 0; \
00782 }
00783
00784 static av_always_inline void lsf_sf_expand(int *slen, int sf, int n1, int n2,
00785 int n3)
00786 {
00787 SPLIT(slen[3], sf, n3)
00788 SPLIT(slen[2], sf, n2)
00789 SPLIT(slen[1], sf, n1)
00790 slen[0] = sf;
00791 }
00792
00793 static void exponents_from_scale_factors(MPADecodeContext *s, GranuleDef *g,
00794 int16_t *exponents)
00795 {
00796 const uint8_t *bstab, *pretab;
00797 int len, i, j, k, l, v0, shift, gain, gains[3];
00798 int16_t *exp_ptr;
00799
00800 exp_ptr = exponents;
00801 gain = g->global_gain - 210;
00802 shift = g->scalefac_scale + 1;
00803
00804 bstab = band_size_long[s->sample_rate_index];
00805 pretab = mpa_pretab[g->preflag];
00806 for (i = 0; i < g->long_end; i++) {
00807 v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift) + 400;
00808 len = bstab[i];
00809 for (j = len; j > 0; j--)
00810 *exp_ptr++ = v0;
00811 }
00812
00813 if (g->short_start < 13) {
00814 bstab = band_size_short[s->sample_rate_index];
00815 gains[0] = gain - (g->subblock_gain[0] << 3);
00816 gains[1] = gain - (g->subblock_gain[1] << 3);
00817 gains[2] = gain - (g->subblock_gain[2] << 3);
00818 k = g->long_end;
00819 for (i = g->short_start; i < 13; i++) {
00820 len = bstab[i];
00821 for (l = 0; l < 3; l++) {
00822 v0 = gains[l] - (g->scale_factors[k++] << shift) + 400;
00823 for (j = len; j > 0; j--)
00824 *exp_ptr++ = v0;
00825 }
00826 }
00827 }
00828 }
00829
00830
00831 static inline int get_bitsz(GetBitContext *s, int n)
00832 {
00833 return n ? get_bits(s, n) : 0;
00834 }
00835
00836
00837 static void switch_buffer(MPADecodeContext *s, int *pos, int *end_pos,
00838 int *end_pos2)
00839 {
00840 if (s->in_gb.buffer && *pos >= s->gb.size_in_bits) {
00841 s->gb = s->in_gb;
00842 s->in_gb.buffer = NULL;
00843 av_assert2((get_bits_count(&s->gb) & 7) == 0);
00844 skip_bits_long(&s->gb, *pos - *end_pos);
00845 *end_pos2 =
00846 *end_pos = *end_pos2 + get_bits_count(&s->gb) - *pos;
00847 *pos = get_bits_count(&s->gb);
00848 }
00849 }
00850
00851
00852
00853
00854
00855
00856
00857 #if CONFIG_FLOAT
00858 #define READ_FLIP_SIGN(dst,src) \
00859 v = AV_RN32A(src) ^ (get_bits1(&s->gb) << 31); \
00860 AV_WN32A(dst, v);
00861 #else
00862 #define READ_FLIP_SIGN(dst,src) \
00863 v = -get_bits1(&s->gb); \
00864 *(dst) = (*(src) ^ v) - v;
00865 #endif
00866
00867 static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
00868 int16_t *exponents, int end_pos2)
00869 {
00870 int s_index;
00871 int i;
00872 int last_pos, bits_left;
00873 VLC *vlc;
00874 int end_pos = FFMIN(end_pos2, s->gb.size_in_bits);
00875
00876
00877 s_index = 0;
00878 for (i = 0; i < 3; i++) {
00879 int j, k, l, linbits;
00880 j = g->region_size[i];
00881 if (j == 0)
00882 continue;
00883
00884 k = g->table_select[i];
00885 l = mpa_huff_data[k][0];
00886 linbits = mpa_huff_data[k][1];
00887 vlc = &huff_vlc[l];
00888
00889 if (!l) {
00890 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid) * 2 * j);
00891 s_index += 2 * j;
00892 continue;
00893 }
00894
00895
00896 for (; j > 0; j--) {
00897 int exponent, x, y;
00898 int v;
00899 int pos = get_bits_count(&s->gb);
00900
00901 if (pos >= end_pos){
00902 switch_buffer(s, &pos, &end_pos, &end_pos2);
00903 if (pos >= end_pos)
00904 break;
00905 }
00906 y = get_vlc2(&s->gb, vlc->table, 7, 3);
00907
00908 if (!y) {
00909 g->sb_hybrid[s_index ] =
00910 g->sb_hybrid[s_index+1] = 0;
00911 s_index += 2;
00912 continue;
00913 }
00914
00915 exponent= exponents[s_index];
00916
00917 av_dlog(s->avctx, "region=%d n=%d x=%d y=%d exp=%d\n",
00918 i, g->region_size[i] - j, x, y, exponent);
00919 if (y & 16) {
00920 x = y >> 5;
00921 y = y & 0x0f;
00922 if (x < 15) {
00923 READ_FLIP_SIGN(g->sb_hybrid + s_index, RENAME(expval_table)[exponent] + x)
00924 } else {
00925 x += get_bitsz(&s->gb, linbits);
00926 v = l3_unscale(x, exponent);
00927 if (get_bits1(&s->gb))
00928 v = -v;
00929 g->sb_hybrid[s_index] = v;
00930 }
00931 if (y < 15) {
00932 READ_FLIP_SIGN(g->sb_hybrid + s_index + 1, RENAME(expval_table)[exponent] + y)
00933 } else {
00934 y += get_bitsz(&s->gb, linbits);
00935 v = l3_unscale(y, exponent);
00936 if (get_bits1(&s->gb))
00937 v = -v;
00938 g->sb_hybrid[s_index+1] = v;
00939 }
00940 } else {
00941 x = y >> 5;
00942 y = y & 0x0f;
00943 x += y;
00944 if (x < 15) {
00945 READ_FLIP_SIGN(g->sb_hybrid + s_index + !!y, RENAME(expval_table)[exponent] + x)
00946 } else {
00947 x += get_bitsz(&s->gb, linbits);
00948 v = l3_unscale(x, exponent);
00949 if (get_bits1(&s->gb))
00950 v = -v;
00951 g->sb_hybrid[s_index+!!y] = v;
00952 }
00953 g->sb_hybrid[s_index + !y] = 0;
00954 }
00955 s_index += 2;
00956 }
00957 }
00958
00959
00960 vlc = &huff_quad_vlc[g->count1table_select];
00961 last_pos = 0;
00962 while (s_index <= 572) {
00963 int pos, code;
00964 pos = get_bits_count(&s->gb);
00965 if (pos >= end_pos) {
00966 if (pos > end_pos2 && last_pos) {
00967
00968
00969 s_index -= 4;
00970 skip_bits_long(&s->gb, last_pos - pos);
00971 av_log(s->avctx, AV_LOG_INFO, "overread, skip %d enddists: %d %d\n", last_pos - pos, end_pos-pos, end_pos2-pos);
00972 if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
00973 s_index=0;
00974 break;
00975 }
00976 switch_buffer(s, &pos, &end_pos, &end_pos2);
00977 if (pos >= end_pos)
00978 break;
00979 }
00980 last_pos = pos;
00981
00982 code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
00983 av_dlog(s->avctx, "t=%d code=%d\n", g->count1table_select, code);
00984 g->sb_hybrid[s_index+0] =
00985 g->sb_hybrid[s_index+1] =
00986 g->sb_hybrid[s_index+2] =
00987 g->sb_hybrid[s_index+3] = 0;
00988 while (code) {
00989 static const int idxtab[16] = { 3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0 };
00990 int v;
00991 int pos = s_index + idxtab[code];
00992 code ^= 8 >> idxtab[code];
00993 READ_FLIP_SIGN(g->sb_hybrid + pos, RENAME(exp_table)+exponents[pos])
00994 }
00995 s_index += 4;
00996 }
00997
00998 bits_left = end_pos2 - get_bits_count(&s->gb);
00999 if (bits_left < 0 && (s->err_recognition & (AV_EF_BUFFER|AV_EF_COMPLIANT))) {
01000 av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
01001 s_index=0;
01002 } else if (bits_left > 0 && (s->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE))) {
01003 av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
01004 s_index = 0;
01005 }
01006 memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid) * (576 - s_index));
01007 skip_bits_long(&s->gb, bits_left);
01008
01009 i = get_bits_count(&s->gb);
01010 switch_buffer(s, &i, &end_pos, &end_pos2);
01011
01012 return 0;
01013 }
01014
01015
01016
01017
01018 static void reorder_block(MPADecodeContext *s, GranuleDef *g)
01019 {
01020 int i, j, len;
01021 INTFLOAT *ptr, *dst, *ptr1;
01022 INTFLOAT tmp[576];
01023
01024 if (g->block_type != 2)
01025 return;
01026
01027 if (g->switch_point) {
01028 if (s->sample_rate_index != 8)
01029 ptr = g->sb_hybrid + 36;
01030 else
01031 ptr = g->sb_hybrid + 72;
01032 } else {
01033 ptr = g->sb_hybrid;
01034 }
01035
01036 for (i = g->short_start; i < 13; i++) {
01037 len = band_size_short[s->sample_rate_index][i];
01038 ptr1 = ptr;
01039 dst = tmp;
01040 for (j = len; j > 0; j--) {
01041 *dst++ = ptr[0*len];
01042 *dst++ = ptr[1*len];
01043 *dst++ = ptr[2*len];
01044 ptr++;
01045 }
01046 ptr += 2 * len;
01047 memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1));
01048 }
01049 }
01050
01051 #define ISQRT2 FIXR(0.70710678118654752440)
01052
01053 static void compute_stereo(MPADecodeContext *s, GranuleDef *g0, GranuleDef *g1)
01054 {
01055 int i, j, k, l;
01056 int sf_max, sf, len, non_zero_found;
01057 INTFLOAT (*is_tab)[16], *tab0, *tab1, tmp0, tmp1, v1, v2;
01058 int non_zero_found_short[3];
01059
01060
01061 if (s->mode_ext & MODE_EXT_I_STEREO) {
01062 if (!s->lsf) {
01063 is_tab = is_table;
01064 sf_max = 7;
01065 } else {
01066 is_tab = is_table_lsf[g1->scalefac_compress & 1];
01067 sf_max = 16;
01068 }
01069
01070 tab0 = g0->sb_hybrid + 576;
01071 tab1 = g1->sb_hybrid + 576;
01072
01073 non_zero_found_short[0] = 0;
01074 non_zero_found_short[1] = 0;
01075 non_zero_found_short[2] = 0;
01076 k = (13 - g1->short_start) * 3 + g1->long_end - 3;
01077 for (i = 12; i >= g1->short_start; i--) {
01078
01079 if (i != 11)
01080 k -= 3;
01081 len = band_size_short[s->sample_rate_index][i];
01082 for (l = 2; l >= 0; l--) {
01083 tab0 -= len;
01084 tab1 -= len;
01085 if (!non_zero_found_short[l]) {
01086
01087 for (j = 0; j < len; j++) {
01088 if (tab1[j] != 0) {
01089 non_zero_found_short[l] = 1;
01090 goto found1;
01091 }
01092 }
01093 sf = g1->scale_factors[k + l];
01094 if (sf >= sf_max)
01095 goto found1;
01096
01097 v1 = is_tab[0][sf];
01098 v2 = is_tab[1][sf];
01099 for (j = 0; j < len; j++) {
01100 tmp0 = tab0[j];
01101 tab0[j] = MULLx(tmp0, v1, FRAC_BITS);
01102 tab1[j] = MULLx(tmp0, v2, FRAC_BITS);
01103 }
01104 } else {
01105 found1:
01106 if (s->mode_ext & MODE_EXT_MS_STEREO) {
01107
01108
01109 for (j = 0; j < len; j++) {
01110 tmp0 = tab0[j];
01111 tmp1 = tab1[j];
01112 tab0[j] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS);
01113 tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS);
01114 }
01115 }
01116 }
01117 }
01118 }
01119
01120 non_zero_found = non_zero_found_short[0] |
01121 non_zero_found_short[1] |
01122 non_zero_found_short[2];
01123
01124 for (i = g1->long_end - 1;i >= 0;i--) {
01125 len = band_size_long[s->sample_rate_index][i];
01126 tab0 -= len;
01127 tab1 -= len;
01128
01129 if (!non_zero_found) {
01130 for (j = 0; j < len; j++) {
01131 if (tab1[j] != 0) {
01132 non_zero_found = 1;
01133 goto found2;
01134 }
01135 }
01136
01137 k = (i == 21) ? 20 : i;
01138 sf = g1->scale_factors[k];
01139 if (sf >= sf_max)
01140 goto found2;
01141 v1 = is_tab[0][sf];
01142 v2 = is_tab[1][sf];
01143 for (j = 0; j < len; j++) {
01144 tmp0 = tab0[j];
01145 tab0[j] = MULLx(tmp0, v1, FRAC_BITS);
01146 tab1[j] = MULLx(tmp0, v2, FRAC_BITS);
01147 }
01148 } else {
01149 found2:
01150 if (s->mode_ext & MODE_EXT_MS_STEREO) {
01151
01152
01153 for (j = 0; j < len; j++) {
01154 tmp0 = tab0[j];
01155 tmp1 = tab1[j];
01156 tab0[j] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS);
01157 tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS);
01158 }
01159 }
01160 }
01161 }
01162 } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
01163
01164
01165
01166 #if CONFIG_FLOAT
01167 s-> dsp.butterflies_float(g0->sb_hybrid, g1->sb_hybrid, 576);
01168 #else
01169 tab0 = g0->sb_hybrid;
01170 tab1 = g1->sb_hybrid;
01171 for (i = 0; i < 576; i++) {
01172 tmp0 = tab0[i];
01173 tmp1 = tab1[i];
01174 tab0[i] = tmp0 + tmp1;
01175 tab1[i] = tmp0 - tmp1;
01176 }
01177 #endif
01178 }
01179 }
01180
01181 #if CONFIG_FLOAT
01182 #if HAVE_MIPSFPU
01183 # include "mips/compute_antialias_float.h"
01184 #endif
01185 #else
01186 #if HAVE_MIPSDSPR1
01187 # include "mips/compute_antialias_fixed.h"
01188 #endif
01189 #endif
01190
01191 #ifndef compute_antialias
01192 #if CONFIG_FLOAT
01193 #define AA(j) do { \
01194 float tmp0 = ptr[-1-j]; \
01195 float tmp1 = ptr[ j]; \
01196 ptr[-1-j] = tmp0 * csa_table[j][0] - tmp1 * csa_table[j][1]; \
01197 ptr[ j] = tmp0 * csa_table[j][1] + tmp1 * csa_table[j][0]; \
01198 } while (0)
01199 #else
01200 #define AA(j) do { \
01201 int tmp0 = ptr[-1-j]; \
01202 int tmp1 = ptr[ j]; \
01203 int tmp2 = MULH(tmp0 + tmp1, csa_table[j][0]); \
01204 ptr[-1-j] = 4 * (tmp2 - MULH(tmp1, csa_table[j][2])); \
01205 ptr[ j] = 4 * (tmp2 + MULH(tmp0, csa_table[j][3])); \
01206 } while (0)
01207 #endif
01208
01209 static void compute_antialias(MPADecodeContext *s, GranuleDef *g)
01210 {
01211 INTFLOAT *ptr;
01212 int n, i;
01213
01214
01215 if (g->block_type == 2) {
01216 if (!g->switch_point)
01217 return;
01218
01219 n = 1;
01220 } else {
01221 n = SBLIMIT - 1;
01222 }
01223
01224 ptr = g->sb_hybrid + 18;
01225 for (i = n; i > 0; i--) {
01226 AA(0);
01227 AA(1);
01228 AA(2);
01229 AA(3);
01230 AA(4);
01231 AA(5);
01232 AA(6);
01233 AA(7);
01234
01235 ptr += 18;
01236 }
01237 }
01238 #endif
01239
01240 static void compute_imdct(MPADecodeContext *s, GranuleDef *g,
01241 INTFLOAT *sb_samples, INTFLOAT *mdct_buf)
01242 {
01243 INTFLOAT *win, *out_ptr, *ptr, *buf, *ptr1;
01244 INTFLOAT out2[12];
01245 int i, j, mdct_long_end, sblimit;
01246
01247
01248 ptr = g->sb_hybrid + 576;
01249 ptr1 = g->sb_hybrid + 2 * 18;
01250 while (ptr >= ptr1) {
01251 int32_t *p;
01252 ptr -= 6;
01253 p = (int32_t*)ptr;
01254 if (p[0] | p[1] | p[2] | p[3] | p[4] | p[5])
01255 break;
01256 }
01257 sblimit = ((ptr - g->sb_hybrid) / 18) + 1;
01258
01259 if (g->block_type == 2) {
01260
01261 if (g->switch_point)
01262 mdct_long_end = 2;
01263 else
01264 mdct_long_end = 0;
01265 } else {
01266 mdct_long_end = sblimit;
01267 }
01268
01269 s->mpadsp.RENAME(imdct36_blocks)(sb_samples, mdct_buf, g->sb_hybrid,
01270 mdct_long_end, g->switch_point,
01271 g->block_type);
01272
01273 buf = mdct_buf + 4*18*(mdct_long_end >> 2) + (mdct_long_end & 3);
01274 ptr = g->sb_hybrid + 18 * mdct_long_end;
01275
01276 for (j = mdct_long_end; j < sblimit; j++) {
01277
01278 win = RENAME(ff_mdct_win)[2 + (4 & -(j & 1))];
01279 out_ptr = sb_samples + j;
01280
01281 for (i = 0; i < 6; i++) {
01282 *out_ptr = buf[4*i];
01283 out_ptr += SBLIMIT;
01284 }
01285 imdct12(out2, ptr + 0);
01286 for (i = 0; i < 6; i++) {
01287 *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*1)];
01288 buf[4*(i + 6*2)] = MULH3(out2[i + 6], win[i + 6], 1);
01289 out_ptr += SBLIMIT;
01290 }
01291 imdct12(out2, ptr + 1);
01292 for (i = 0; i < 6; i++) {
01293 *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*2)];
01294 buf[4*(i + 6*0)] = MULH3(out2[i + 6], win[i + 6], 1);
01295 out_ptr += SBLIMIT;
01296 }
01297 imdct12(out2, ptr + 2);
01298 for (i = 0; i < 6; i++) {
01299 buf[4*(i + 6*0)] = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*0)];
01300 buf[4*(i + 6*1)] = MULH3(out2[i + 6], win[i + 6], 1);
01301 buf[4*(i + 6*2)] = 0;
01302 }
01303 ptr += 18;
01304 buf += (j&3) != 3 ? 1 : (4*18-3);
01305 }
01306
01307 for (j = sblimit; j < SBLIMIT; j++) {
01308
01309 out_ptr = sb_samples + j;
01310 for (i = 0; i < 18; i++) {
01311 *out_ptr = buf[4*i];
01312 buf[4*i] = 0;
01313 out_ptr += SBLIMIT;
01314 }
01315 buf += (j&3) != 3 ? 1 : (4*18-3);
01316 }
01317 }
01318
01319
01320 static int mp_decode_layer3(MPADecodeContext *s)
01321 {
01322 int nb_granules, main_data_begin;
01323 int gr, ch, blocksplit_flag, i, j, k, n, bits_pos;
01324 GranuleDef *g;
01325 int16_t exponents[576];
01326
01327
01328 if (s->lsf) {
01329 main_data_begin = get_bits(&s->gb, 8);
01330 skip_bits(&s->gb, s->nb_channels);
01331 nb_granules = 1;
01332 } else {
01333 main_data_begin = get_bits(&s->gb, 9);
01334 if (s->nb_channels == 2)
01335 skip_bits(&s->gb, 3);
01336 else
01337 skip_bits(&s->gb, 5);
01338 nb_granules = 2;
01339 for (ch = 0; ch < s->nb_channels; ch++) {
01340 s->granules[ch][0].scfsi = 0;
01341 s->granules[ch][1].scfsi = get_bits(&s->gb, 4);
01342 }
01343 }
01344
01345 for (gr = 0; gr < nb_granules; gr++) {
01346 for (ch = 0; ch < s->nb_channels; ch++) {
01347 av_dlog(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch);
01348 g = &s->granules[ch][gr];
01349 g->part2_3_length = get_bits(&s->gb, 12);
01350 g->big_values = get_bits(&s->gb, 9);
01351 if (g->big_values > 288) {
01352 av_log(s->avctx, AV_LOG_ERROR, "big_values too big\n");
01353 return AVERROR_INVALIDDATA;
01354 }
01355
01356 g->global_gain = get_bits(&s->gb, 8);
01357
01358
01359 if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
01360 MODE_EXT_MS_STEREO)
01361 g->global_gain -= 2;
01362 if (s->lsf)
01363 g->scalefac_compress = get_bits(&s->gb, 9);
01364 else
01365 g->scalefac_compress = get_bits(&s->gb, 4);
01366 blocksplit_flag = get_bits1(&s->gb);
01367 if (blocksplit_flag) {
01368 g->block_type = get_bits(&s->gb, 2);
01369 if (g->block_type == 0) {
01370 av_log(s->avctx, AV_LOG_ERROR, "invalid block type\n");
01371 return AVERROR_INVALIDDATA;
01372 }
01373 g->switch_point = get_bits1(&s->gb);
01374 for (i = 0; i < 2; i++)
01375 g->table_select[i] = get_bits(&s->gb, 5);
01376 for (i = 0; i < 3; i++)
01377 g->subblock_gain[i] = get_bits(&s->gb, 3);
01378 ff_init_short_region(s, g);
01379 } else {
01380 int region_address1, region_address2;
01381 g->block_type = 0;
01382 g->switch_point = 0;
01383 for (i = 0; i < 3; i++)
01384 g->table_select[i] = get_bits(&s->gb, 5);
01385
01386 region_address1 = get_bits(&s->gb, 4);
01387 region_address2 = get_bits(&s->gb, 3);
01388 av_dlog(s->avctx, "region1=%d region2=%d\n",
01389 region_address1, region_address2);
01390 ff_init_long_region(s, g, region_address1, region_address2);
01391 }
01392 ff_region_offset2size(g);
01393 ff_compute_band_indexes(s, g);
01394
01395 g->preflag = 0;
01396 if (!s->lsf)
01397 g->preflag = get_bits1(&s->gb);
01398 g->scalefac_scale = get_bits1(&s->gb);
01399 g->count1table_select = get_bits1(&s->gb);
01400 av_dlog(s->avctx, "block_type=%d switch_point=%d\n",
01401 g->block_type, g->switch_point);
01402 }
01403 }
01404
01405 if (!s->adu_mode) {
01406 int skip;
01407 const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3);
01408 int extrasize = av_clip(get_bits_left(&s->gb) >> 3, 0, EXTRABYTES);
01409 av_assert1((get_bits_count(&s->gb) & 7) == 0);
01410
01411 av_dlog(s->avctx, "seekback:%d, lastbuf:%d\n",
01412 main_data_begin, s->last_buf_size);
01413
01414 memcpy(s->last_buf + s->last_buf_size, ptr, extrasize);
01415 s->in_gb = s->gb;
01416 init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8);
01417 #if !UNCHECKED_BITSTREAM_READER
01418 s->gb.size_in_bits_plus8 += FFMAX(extrasize, LAST_BUF_SIZE - s->last_buf_size) * 8;
01419 #endif
01420 s->last_buf_size <<= 3;
01421 for (gr = 0; gr < nb_granules && (s->last_buf_size >> 3) < main_data_begin; gr++) {
01422 for (ch = 0; ch < s->nb_channels; ch++) {
01423 g = &s->granules[ch][gr];
01424 s->last_buf_size += g->part2_3_length;
01425 memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid));
01426 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
01427 }
01428 }
01429 skip = s->last_buf_size - 8 * main_data_begin;
01430 if (skip >= s->gb.size_in_bits && s->in_gb.buffer) {
01431 skip_bits_long(&s->in_gb, skip - s->gb.size_in_bits);
01432 s->gb = s->in_gb;
01433 s->in_gb.buffer = NULL;
01434 } else {
01435 skip_bits_long(&s->gb, skip);
01436 }
01437 } else {
01438 gr = 0;
01439 }
01440
01441 for (; gr < nb_granules; gr++) {
01442 for (ch = 0; ch < s->nb_channels; ch++) {
01443 g = &s->granules[ch][gr];
01444 bits_pos = get_bits_count(&s->gb);
01445
01446 if (!s->lsf) {
01447 uint8_t *sc;
01448 int slen, slen1, slen2;
01449
01450
01451 slen1 = slen_table[0][g->scalefac_compress];
01452 slen2 = slen_table[1][g->scalefac_compress];
01453 av_dlog(s->avctx, "slen1=%d slen2=%d\n", slen1, slen2);
01454 if (g->block_type == 2) {
01455 n = g->switch_point ? 17 : 18;
01456 j = 0;
01457 if (slen1) {
01458 for (i = 0; i < n; i++)
01459 g->scale_factors[j++] = get_bits(&s->gb, slen1);
01460 } else {
01461 for (i = 0; i < n; i++)
01462 g->scale_factors[j++] = 0;
01463 }
01464 if (slen2) {
01465 for (i = 0; i < 18; i++)
01466 g->scale_factors[j++] = get_bits(&s->gb, slen2);
01467 for (i = 0; i < 3; i++)
01468 g->scale_factors[j++] = 0;
01469 } else {
01470 for (i = 0; i < 21; i++)
01471 g->scale_factors[j++] = 0;
01472 }
01473 } else {
01474 sc = s->granules[ch][0].scale_factors;
01475 j = 0;
01476 for (k = 0; k < 4; k++) {
01477 n = k == 0 ? 6 : 5;
01478 if ((g->scfsi & (0x8 >> k)) == 0) {
01479 slen = (k < 2) ? slen1 : slen2;
01480 if (slen) {
01481 for (i = 0; i < n; i++)
01482 g->scale_factors[j++] = get_bits(&s->gb, slen);
01483 } else {
01484 for (i = 0; i < n; i++)
01485 g->scale_factors[j++] = 0;
01486 }
01487 } else {
01488
01489 for (i = 0; i < n; i++) {
01490 g->scale_factors[j] = sc[j];
01491 j++;
01492 }
01493 }
01494 }
01495 g->scale_factors[j++] = 0;
01496 }
01497 } else {
01498 int tindex, tindex2, slen[4], sl, sf;
01499
01500
01501 if (g->block_type == 2)
01502 tindex = g->switch_point ? 2 : 1;
01503 else
01504 tindex = 0;
01505
01506 sf = g->scalefac_compress;
01507 if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
01508
01509 sf >>= 1;
01510 if (sf < 180) {
01511 lsf_sf_expand(slen, sf, 6, 6, 0);
01512 tindex2 = 3;
01513 } else if (sf < 244) {
01514 lsf_sf_expand(slen, sf - 180, 4, 4, 0);
01515 tindex2 = 4;
01516 } else {
01517 lsf_sf_expand(slen, sf - 244, 3, 0, 0);
01518 tindex2 = 5;
01519 }
01520 } else {
01521
01522 if (sf < 400) {
01523 lsf_sf_expand(slen, sf, 5, 4, 4);
01524 tindex2 = 0;
01525 } else if (sf < 500) {
01526 lsf_sf_expand(slen, sf - 400, 5, 4, 0);
01527 tindex2 = 1;
01528 } else {
01529 lsf_sf_expand(slen, sf - 500, 3, 0, 0);
01530 tindex2 = 2;
01531 g->preflag = 1;
01532 }
01533 }
01534
01535 j = 0;
01536 for (k = 0; k < 4; k++) {
01537 n = lsf_nsf_table[tindex2][tindex][k];
01538 sl = slen[k];
01539 if (sl) {
01540 for (i = 0; i < n; i++)
01541 g->scale_factors[j++] = get_bits(&s->gb, sl);
01542 } else {
01543 for (i = 0; i < n; i++)
01544 g->scale_factors[j++] = 0;
01545 }
01546 }
01547
01548 for (; j < 40; j++)
01549 g->scale_factors[j] = 0;
01550 }
01551
01552 exponents_from_scale_factors(s, g, exponents);
01553
01554
01555 huffman_decode(s, g, exponents, bits_pos + g->part2_3_length);
01556 }
01557
01558 if (s->mode == MPA_JSTEREO)
01559 compute_stereo(s, &s->granules[0][gr], &s->granules[1][gr]);
01560
01561 for (ch = 0; ch < s->nb_channels; ch++) {
01562 g = &s->granules[ch][gr];
01563
01564 reorder_block(s, g);
01565 compute_antialias(s, g);
01566 compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
01567 }
01568 }
01569 if (get_bits_count(&s->gb) < 0)
01570 skip_bits_long(&s->gb, -get_bits_count(&s->gb));
01571 return nb_granules * 18;
01572 }
01573
01574 static int mp_decode_frame(MPADecodeContext *s, OUT_INT **samples,
01575 const uint8_t *buf, int buf_size)
01576 {
01577 int i, nb_frames, ch, ret;
01578 OUT_INT *samples_ptr;
01579
01580 init_get_bits(&s->gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE) * 8);
01581
01582
01583 if (s->error_protection)
01584 skip_bits(&s->gb, 16);
01585
01586 switch(s->layer) {
01587 case 1:
01588 s->avctx->frame_size = 384;
01589 nb_frames = mp_decode_layer1(s);
01590 break;
01591 case 2:
01592 s->avctx->frame_size = 1152;
01593 nb_frames = mp_decode_layer2(s);
01594 break;
01595 case 3:
01596 s->avctx->frame_size = s->lsf ? 576 : 1152;
01597 default:
01598 nb_frames = mp_decode_layer3(s);
01599
01600 s->last_buf_size=0;
01601 if (s->in_gb.buffer) {
01602 align_get_bits(&s->gb);
01603 i = get_bits_left(&s->gb)>>3;
01604 if (i >= 0 && i <= BACKSTEP_SIZE) {
01605 memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i);
01606 s->last_buf_size=i;
01607 } else
01608 av_log(s->avctx, AV_LOG_ERROR, "invalid old backstep %d\n", i);
01609 s->gb = s->in_gb;
01610 s->in_gb.buffer = NULL;
01611 }
01612
01613 align_get_bits(&s->gb);
01614 av_assert1((get_bits_count(&s->gb) & 7) == 0);
01615 i = get_bits_left(&s->gb) >> 3;
01616
01617 if (i < 0 || i > BACKSTEP_SIZE || nb_frames < 0) {
01618 if (i < 0)
01619 av_log(s->avctx, AV_LOG_ERROR, "invalid new backstep %d\n", i);
01620 i = FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE);
01621 }
01622 av_assert1(i <= buf_size - HEADER_SIZE && i >= 0);
01623 memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i);
01624 s->last_buf_size += i;
01625 }
01626
01627 if(nb_frames < 0)
01628 return nb_frames;
01629
01630
01631 if (!samples) {
01632 s->frame.nb_samples = s->avctx->frame_size;
01633 if ((ret = ff_get_buffer(s->avctx, &s->frame)) < 0) {
01634 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01635 return ret;
01636 }
01637 samples = (OUT_INT **)s->frame.extended_data;
01638 }
01639
01640
01641 for (ch = 0; ch < s->nb_channels; ch++) {
01642 int sample_stride;
01643 if (s->avctx->sample_fmt == OUT_FMT_P) {
01644 samples_ptr = samples[ch];
01645 sample_stride = 1;
01646 } else {
01647 samples_ptr = samples[0] + ch;
01648 sample_stride = s->nb_channels;
01649 }
01650 for (i = 0; i < nb_frames; i++) {
01651 RENAME(ff_mpa_synth_filter)(&s->mpadsp, s->synth_buf[ch],
01652 &(s->synth_buf_offset[ch]),
01653 RENAME(ff_mpa_synth_window),
01654 &s->dither_state, samples_ptr,
01655 sample_stride, s->sb_samples[ch][i]);
01656 samples_ptr += 32 * sample_stride;
01657 }
01658 }
01659
01660 return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
01661 }
01662
01663 static int decode_frame(AVCodecContext * avctx, void *data, int *got_frame_ptr,
01664 AVPacket *avpkt)
01665 {
01666 const uint8_t *buf = avpkt->data;
01667 int buf_size = avpkt->size;
01668 MPADecodeContext *s = avctx->priv_data;
01669 uint32_t header;
01670 int ret;
01671
01672 while(buf_size && !*buf){
01673 buf++;
01674 buf_size--;
01675 }
01676
01677 if (buf_size < HEADER_SIZE)
01678 return AVERROR_INVALIDDATA;
01679
01680 header = AV_RB32(buf);
01681 if (header>>8 == AV_RB32("TAG")>>8) {
01682 av_log(avctx, AV_LOG_DEBUG, "discarding ID3 tag\n");
01683 return buf_size;
01684 }
01685 if (ff_mpa_check_header(header) < 0) {
01686 av_log(avctx, AV_LOG_ERROR, "Header missing\n");
01687 return AVERROR_INVALIDDATA;
01688 }
01689
01690 if (avpriv_mpegaudio_decode_header((MPADecodeHeader *)s, header) == 1) {
01691
01692 s->frame_size = -1;
01693 return AVERROR_INVALIDDATA;
01694 }
01695
01696 avctx->channels = s->nb_channels;
01697 avctx->channel_layout = s->nb_channels == 1 ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
01698 if (!avctx->bit_rate)
01699 avctx->bit_rate = s->bit_rate;
01700
01701 if (s->frame_size <= 0 || s->frame_size > buf_size) {
01702 av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
01703 return AVERROR_INVALIDDATA;
01704 } else if (s->frame_size < buf_size) {
01705 av_log(avctx, AV_LOG_DEBUG, "incorrect frame size - multiple frames in buffer?\n");
01706 buf_size= s->frame_size;
01707 }
01708
01709 ret = mp_decode_frame(s, NULL, buf, buf_size);
01710 if (ret >= 0) {
01711 *got_frame_ptr = 1;
01712 *(AVFrame *)data = s->frame;
01713 avctx->sample_rate = s->sample_rate;
01714
01715 } else {
01716 av_log(avctx, AV_LOG_ERROR, "Error while decoding MPEG audio frame.\n");
01717
01718
01719
01720
01721
01722 *got_frame_ptr = 0;
01723 if (buf_size == avpkt->size || ret != AVERROR_INVALIDDATA)
01724 return ret;
01725 }
01726 s->frame_size = 0;
01727 return buf_size;
01728 }
01729
01730 static void mp_flush(MPADecodeContext *ctx)
01731 {
01732 memset(ctx->synth_buf, 0, sizeof(ctx->synth_buf));
01733 ctx->last_buf_size = 0;
01734 }
01735
01736 static void flush(AVCodecContext *avctx)
01737 {
01738 mp_flush(avctx->priv_data);
01739 }
01740
01741 #if CONFIG_MP3ADU_DECODER || CONFIG_MP3ADUFLOAT_DECODER
01742 static int decode_frame_adu(AVCodecContext *avctx, void *data,
01743 int *got_frame_ptr, AVPacket *avpkt)
01744 {
01745 const uint8_t *buf = avpkt->data;
01746 int buf_size = avpkt->size;
01747 MPADecodeContext *s = avctx->priv_data;
01748 uint32_t header;
01749 int len, ret;
01750 int av_unused out_size;
01751
01752 len = buf_size;
01753
01754
01755 if (buf_size < HEADER_SIZE) {
01756 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
01757 return AVERROR_INVALIDDATA;
01758 }
01759
01760
01761 if (len > MPA_MAX_CODED_FRAME_SIZE)
01762 len = MPA_MAX_CODED_FRAME_SIZE;
01763
01764
01765 header = AV_RB32(buf) | 0xffe00000;
01766
01767 if (ff_mpa_check_header(header) < 0) {
01768 av_log(avctx, AV_LOG_ERROR, "Invalid frame header\n");
01769 return AVERROR_INVALIDDATA;
01770 }
01771
01772 avpriv_mpegaudio_decode_header((MPADecodeHeader *)s, header);
01773
01774 avctx->sample_rate = s->sample_rate;
01775 avctx->channels = s->nb_channels;
01776 if (!avctx->bit_rate)
01777 avctx->bit_rate = s->bit_rate;
01778
01779 s->frame_size = len;
01780
01781 ret = mp_decode_frame(s, NULL, buf, buf_size);
01782 if (ret < 0) {
01783 av_log(avctx, AV_LOG_ERROR, "Error while decoding MPEG audio frame.\n");
01784 return ret;
01785 }
01786
01787 *got_frame_ptr = 1;
01788 *(AVFrame *)data = s->frame;
01789
01790 return buf_size;
01791 }
01792 #endif
01793
01794 #if CONFIG_MP3ON4_DECODER || CONFIG_MP3ON4FLOAT_DECODER
01795
01799 typedef struct MP3On4DecodeContext {
01800 AVFrame *frame;
01801 int frames;
01802 int syncword;
01803 const uint8_t *coff;
01804 MPADecodeContext *mp3decctx[5];
01805 } MP3On4DecodeContext;
01806
01807 #include "mpeg4audio.h"
01808
01809
01810
01811
01812 static const uint8_t mp3Frames[8] = { 0, 1, 1, 2, 3, 3, 4, 5 };
01813
01814
01815 static const uint8_t chan_offset[8][5] = {
01816 { 0 },
01817 { 0 },
01818 { 0 },
01819 { 2, 0 },
01820 { 2, 0, 3 },
01821 { 2, 0, 3 },
01822 { 2, 0, 4, 3 },
01823 { 2, 0, 6, 4, 3 },
01824 };
01825
01826
01827 static const int16_t chan_layout[8] = {
01828 0,
01829 AV_CH_LAYOUT_MONO,
01830 AV_CH_LAYOUT_STEREO,
01831 AV_CH_LAYOUT_SURROUND,
01832 AV_CH_LAYOUT_4POINT0,
01833 AV_CH_LAYOUT_5POINT0,
01834 AV_CH_LAYOUT_5POINT1,
01835 AV_CH_LAYOUT_7POINT1
01836 };
01837
01838 static av_cold int decode_close_mp3on4(AVCodecContext * avctx)
01839 {
01840 MP3On4DecodeContext *s = avctx->priv_data;
01841 int i;
01842
01843 for (i = 0; i < s->frames; i++)
01844 av_free(s->mp3decctx[i]);
01845
01846 return 0;
01847 }
01848
01849
01850 static int decode_init_mp3on4(AVCodecContext * avctx)
01851 {
01852 MP3On4DecodeContext *s = avctx->priv_data;
01853 MPEG4AudioConfig cfg;
01854 int i;
01855
01856 if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
01857 av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
01858 return AVERROR_INVALIDDATA;
01859 }
01860
01861 avpriv_mpeg4audio_get_config(&cfg, avctx->extradata,
01862 avctx->extradata_size * 8, 1);
01863 if (!cfg.chan_config || cfg.chan_config > 7) {
01864 av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
01865 return AVERROR_INVALIDDATA;
01866 }
01867 s->frames = mp3Frames[cfg.chan_config];
01868 s->coff = chan_offset[cfg.chan_config];
01869 avctx->channels = ff_mpeg4audio_channels[cfg.chan_config];
01870 avctx->channel_layout = chan_layout[cfg.chan_config];
01871
01872 if (cfg.sample_rate < 16000)
01873 s->syncword = 0xffe00000;
01874 else
01875 s->syncword = 0xfff00000;
01876
01877
01878
01879
01880
01881
01882
01883 s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
01884 if (!s->mp3decctx[0])
01885 goto alloc_fail;
01886
01887 avctx->priv_data = s->mp3decctx[0];
01888 decode_init(avctx);
01889 s->frame = avctx->coded_frame;
01890
01891 avctx->priv_data = s;
01892 s->mp3decctx[0]->adu_mode = 1;
01893
01894
01895
01896
01897 for (i = 1; i < s->frames; i++) {
01898 s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
01899 if (!s->mp3decctx[i])
01900 goto alloc_fail;
01901 s->mp3decctx[i]->adu_mode = 1;
01902 s->mp3decctx[i]->avctx = avctx;
01903 s->mp3decctx[i]->mpadsp = s->mp3decctx[0]->mpadsp;
01904 }
01905
01906 return 0;
01907 alloc_fail:
01908 decode_close_mp3on4(avctx);
01909 return AVERROR(ENOMEM);
01910 }
01911
01912
01913 static void flush_mp3on4(AVCodecContext *avctx)
01914 {
01915 int i;
01916 MP3On4DecodeContext *s = avctx->priv_data;
01917
01918 for (i = 0; i < s->frames; i++)
01919 mp_flush(s->mp3decctx[i]);
01920 }
01921
01922
01923 static int decode_frame_mp3on4(AVCodecContext *avctx, void *data,
01924 int *got_frame_ptr, AVPacket *avpkt)
01925 {
01926 const uint8_t *buf = avpkt->data;
01927 int buf_size = avpkt->size;
01928 MP3On4DecodeContext *s = avctx->priv_data;
01929 MPADecodeContext *m;
01930 int fsize, len = buf_size, out_size = 0;
01931 uint32_t header;
01932 OUT_INT **out_samples;
01933 OUT_INT *outptr[2];
01934 int fr, ch, ret;
01935
01936
01937 s->frame->nb_samples = s->frames * MPA_FRAME_SIZE;
01938 if ((ret = ff_get_buffer(avctx, s->frame)) < 0) {
01939 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01940 return ret;
01941 }
01942 out_samples = (OUT_INT **)s->frame->extended_data;
01943
01944
01945 if (buf_size < HEADER_SIZE)
01946 return AVERROR_INVALIDDATA;
01947
01948 avctx->bit_rate = 0;
01949
01950 ch = 0;
01951 for (fr = 0; fr < s->frames; fr++) {
01952 fsize = AV_RB16(buf) >> 4;
01953 fsize = FFMIN3(fsize, len, MPA_MAX_CODED_FRAME_SIZE);
01954 m = s->mp3decctx[fr];
01955 av_assert1(m);
01956
01957 if (fsize < HEADER_SIZE) {
01958 av_log(avctx, AV_LOG_ERROR, "Frame size smaller than header size\n");
01959 return AVERROR_INVALIDDATA;
01960 }
01961 header = (AV_RB32(buf) & 0x000fffff) | s->syncword;
01962
01963 if (ff_mpa_check_header(header) < 0)
01964 break;
01965
01966 avpriv_mpegaudio_decode_header((MPADecodeHeader *)m, header);
01967
01968 if (ch + m->nb_channels > avctx->channels || s->coff[fr] + m->nb_channels > avctx->channels) {
01969 av_log(avctx, AV_LOG_ERROR, "frame channel count exceeds codec "
01970 "channel count\n");
01971 return AVERROR_INVALIDDATA;
01972 }
01973 ch += m->nb_channels;
01974
01975 outptr[0] = out_samples[s->coff[fr]];
01976 if (m->nb_channels > 1)
01977 outptr[1] = out_samples[s->coff[fr] + 1];
01978
01979 if ((ret = mp_decode_frame(m, outptr, buf, fsize)) < 0)
01980 return ret;
01981
01982 out_size += ret;
01983 buf += fsize;
01984 len -= fsize;
01985
01986 avctx->bit_rate += m->bit_rate;
01987 }
01988
01989
01990 avctx->sample_rate = s->mp3decctx[0]->sample_rate;
01991
01992 s->frame->nb_samples = out_size / (avctx->channels * sizeof(OUT_INT));
01993 *got_frame_ptr = 1;
01994 *(AVFrame *)data = *s->frame;
01995
01996 return buf_size;
01997 }
01998 #endif
01999
02000 #if !CONFIG_FLOAT
02001 #if CONFIG_MP1_DECODER
02002 AVCodec ff_mp1_decoder = {
02003 .name = "mp1",
02004 .type = AVMEDIA_TYPE_AUDIO,
02005 .id = AV_CODEC_ID_MP1,
02006 .priv_data_size = sizeof(MPADecodeContext),
02007 .init = decode_init,
02008 .decode = decode_frame,
02009 .capabilities = CODEC_CAP_DR1,
02010 .flush = flush,
02011 .long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
02012 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
02013 AV_SAMPLE_FMT_S16,
02014 AV_SAMPLE_FMT_NONE },
02015 };
02016 #endif
02017 #if CONFIG_MP2_DECODER
02018 AVCodec ff_mp2_decoder = {
02019 .name = "mp2",
02020 .type = AVMEDIA_TYPE_AUDIO,
02021 .id = AV_CODEC_ID_MP2,
02022 .priv_data_size = sizeof(MPADecodeContext),
02023 .init = decode_init,
02024 .decode = decode_frame,
02025 .capabilities = CODEC_CAP_DR1,
02026 .flush = flush,
02027 .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
02028 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
02029 AV_SAMPLE_FMT_S16,
02030 AV_SAMPLE_FMT_NONE },
02031 };
02032 #endif
02033 #if CONFIG_MP3_DECODER
02034 AVCodec ff_mp3_decoder = {
02035 .name = "mp3",
02036 .type = AVMEDIA_TYPE_AUDIO,
02037 .id = AV_CODEC_ID_MP3,
02038 .priv_data_size = sizeof(MPADecodeContext),
02039 .init = decode_init,
02040 .decode = decode_frame,
02041 .capabilities = CODEC_CAP_DR1,
02042 .flush = flush,
02043 .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
02044 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
02045 AV_SAMPLE_FMT_S16,
02046 AV_SAMPLE_FMT_NONE },
02047 };
02048 #endif
02049 #if CONFIG_MP3ADU_DECODER
02050 AVCodec ff_mp3adu_decoder = {
02051 .name = "mp3adu",
02052 .type = AVMEDIA_TYPE_AUDIO,
02053 .id = AV_CODEC_ID_MP3ADU,
02054 .priv_data_size = sizeof(MPADecodeContext),
02055 .init = decode_init,
02056 .decode = decode_frame_adu,
02057 .capabilities = CODEC_CAP_DR1,
02058 .flush = flush,
02059 .long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
02060 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
02061 AV_SAMPLE_FMT_S16,
02062 AV_SAMPLE_FMT_NONE },
02063 };
02064 #endif
02065 #if CONFIG_MP3ON4_DECODER
02066 AVCodec ff_mp3on4_decoder = {
02067 .name = "mp3on4",
02068 .type = AVMEDIA_TYPE_AUDIO,
02069 .id = AV_CODEC_ID_MP3ON4,
02070 .priv_data_size = sizeof(MP3On4DecodeContext),
02071 .init = decode_init_mp3on4,
02072 .close = decode_close_mp3on4,
02073 .decode = decode_frame_mp3on4,
02074 .capabilities = CODEC_CAP_DR1,
02075 .flush = flush_mp3on4,
02076 .long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"),
02077 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
02078 AV_SAMPLE_FMT_NONE },
02079 };
02080 #endif
02081 #endif