+++ /dev/null
-diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
-index baff415..49d6ea9 100644
---- a/libavcodec/ac3dec.c
-+++ b/libavcodec/ac3dec.c
-@@ -826,14 +826,105 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
-
- /* spectral extension strategy */
- if (s->eac3 && (!blk || get_bits1(gbc))) {
-- if (get_bits1(gbc)) {
-- av_log_missing_feature(s->avctx, "Spectral extension", 1);
-- return -1;
-+ s->spx_in_use = get_bits1(gbc);
-+ if (s->spx_in_use) {
-+ int copy_start, start_subband, end_subband, start_freq, end_freq;
-+
-+ /* determine which channels use spx */
-+ if (s->channel_mode == AC3_CHMODE_MONO) {
-+ s->channel_uses_spx[1] = 1;
-+ } else {
-+ for (ch = 1; ch <= fbw_channels; ch++)
-+ s->channel_uses_spx[ch] = get_bits1(gbc);
-+ }
-+
-+ /* get the frequency bins of the spx copy region and the spx start
-+ and end subbands */
-+ copy_start = get_bits(gbc, 2);
-+ start_subband = get_bits(gbc, 3) + 2;
-+ if (start_subband > 7)
-+ start_subband += start_subband - 7;
-+ end_subband = get_bits(gbc, 3) + 5;
-+ if (end_subband > 7)
-+ end_subband += end_subband - 7;
-+ copy_start = copy_start * 12 + 25;
-+ start_freq = start_subband * 12 + 25;
-+ end_freq = end_subband * 12 + 25;
-+
-+ /* check validity of spx ranges */
-+ if (start_subband >= end_subband) {
-+ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
-+ "range (%d >= %d)\n", start_subband, end_subband);
-+ return -1;
-+ }
-+ if (copy_start >= start_freq) {
-+ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
-+ "copy start bin (%d >= %d)\n", copy_start, start_freq);
-+ return -1;
-+ }
-+
-+ s->spx_copy_start_freq = copy_start;
-+ s->spx_start_subband = start_subband;
-+ s->spx_start_freq = start_freq;
-+ s->spx_end_freq = end_freq;
-+
-+ decode_band_structure(gbc, blk, s->eac3, 0,
-+ start_subband, end_subband,
-+ ff_eac3_default_spx_band_struct,
-+ &s->num_spx_bands,
-+ s->spx_band_sizes);
-+ } else {
-+ for (ch = 1; ch <= fbw_channels; ch++) {
-+ s->channel_uses_spx[ch] = 0;
-+ s->first_spx_coords[ch] = 1;
-+ }
- }
-- /* TODO: parse spectral extension strategy info */
- }
-
-- /* TODO: spectral extension coordinates */
-+ /* spectral extension coordinates */
-+ if (s->spx_in_use) {
-+ for (ch = 1; ch <= fbw_channels; ch++) {
-+ if (s->channel_uses_spx[ch]) {
-+ if (s->first_spx_coords[ch] || get_bits1(gbc)) {
-+ float spx_blend;
-+ int bin, master_spx_coord;
-+
-+ s->first_spx_coords[ch] = 0;
-+ spx_blend = get_bits(gbc, 5) * (1.0f/32);
-+ master_spx_coord = get_bits(gbc, 2) * 3;
-+
-+ bin = s->spx_start_freq;
-+ for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
-+ int bandsize;
-+ int spx_coord_exp, spx_coord_mant;
-+ float nratio, sblend, nblend, spx_coord;
-+
-+ /* calculate blending factors */
-+ bandsize = s->spx_band_sizes[bnd];
-+ nratio = ((float)((bin + (bandsize >> 1))) / s->spx_end_freq) - spx_blend;
-+ nratio = av_clipf(nratio, 0.0f, 1.0f);
-+ nblend = sqrtf(3.0f * nratio); // noise is scaled by sqrt(3) to give unity variance
-+ sblend = sqrtf(1.0f - nratio);
-+ bin += bandsize;
-+
-+ /* decode spx coordinates */
-+ spx_coord_exp = get_bits(gbc, 4);
-+ spx_coord_mant = get_bits(gbc, 2);
-+ if (spx_coord_exp == 15) spx_coord_mant <<= 1;
-+ else spx_coord_mant += 4;
-+ spx_coord_mant <<= (25 - spx_coord_exp - master_spx_coord);
-+ spx_coord = spx_coord_mant * (1.0f/(1<<23));
-+
-+ /* multiply noise and signal blending factors by spx coordinate */
-+ s->spx_noise_blend [ch][bnd] = nblend * spx_coord;
-+ s->spx_signal_blend[ch][bnd] = sblend * spx_coord;
-+ }
-+ }
-+ } else {
-+ s->first_spx_coords[ch] = 1;
-+ }
-+ }
-+ }
-
- /* coupling strategy */
- if (s->eac3 ? s->cpl_strategy_exists[blk] : get_bits1(gbc)) {
-@@ -870,9 +961,9 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
- s->phase_flags_in_use = get_bits1(gbc);
-
- /* coupling frequency range */
-- /* TODO: modify coupling end freq if spectral extension is used */
- cpl_start_subband = get_bits(gbc, 4);
-- cpl_end_subband = get_bits(gbc, 4) + 3;
-+ cpl_end_subband = s->spx_in_use ? s->spx_start_subband - 1 :
-+ get_bits(gbc, 4) + 3;
- if (cpl_start_subband >= cpl_end_subband) {
- av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d >= %d)\n",
- cpl_start_subband, cpl_end_subband);
-@@ -945,8 +1036,11 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
- if (channel_mode == AC3_CHMODE_STEREO) {
- if ((s->eac3 && !blk) || get_bits1(gbc)) {
- s->num_rematrixing_bands = 4;
-- if(cpl_in_use && s->start_freq[CPL_CH] <= 61)
-+ if (cpl_in_use && s->start_freq[CPL_CH] <= 61) {
- s->num_rematrixing_bands -= 1 + (s->start_freq[CPL_CH] == 37);
-+ } else if (s->spx_in_use && s->spx_start_freq <= 61) {
-+ s->num_rematrixing_bands -= 1;
-+ }
- for(bnd=0; bnd<s->num_rematrixing_bands; bnd++)
- s->rematrixing_flags[bnd] = get_bits1(gbc);
- } else if (!blk) {
-@@ -971,6 +1065,8 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
- int prev = s->end_freq[ch];
- if (s->channel_in_cpl[ch])
- s->end_freq[ch] = s->start_freq[CPL_CH];
-+ else if (s->channel_uses_spx[ch])
-+ s->end_freq[ch] = s->spx_start_freq;
- else {
- int bandwidth_code = get_bits(gbc, 6);
- if (bandwidth_code > 60) {
-@@ -1167,8 +1263,6 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
-
- /* TODO: generate enhanced coupling coordinates and uncouple */
-
-- /* TODO: apply spectral extension */
--
- /* recover coefficients if rematrixing is in use */
- if(s->channel_mode == AC3_CHMODE_STEREO)
- do_rematrixing(s);
-@@ -1184,6 +1278,10 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
- s->dsp.int32_to_float_fmul_scalar(s->transform_coeffs[ch], s->fixed_coeffs[ch], gain, 256);
- }
-
-+ /* apply spectral extension to high frequency bins */
-+ if (s->spx_in_use)
-+ ff_eac3_apply_spectral_extension(s);
-+
- /* downmix and MDCT. order depends on whether block switching is used for
- any channel in this block. this is because coefficients for the long
- and short transforms cannot be mixed. */
-diff --git a/libavcodec/ac3dec.h b/libavcodec/ac3dec.h
-index 38c2deb..fa6057d 100644
---- a/libavcodec/ac3dec.h
-+++ b/libavcodec/ac3dec.h
-@@ -42,6 +42,7 @@
- #define AC3_MAX_COEFS 256
- #define AC3_BLOCK_SIZE 256
- #define MAX_BLOCKS 6
-+#define SPX_MAX_BANDS 17
-
- typedef struct {
- AVCodecContext *avctx; ///< parent context
-@@ -88,6 +89,23 @@ typedef struct {
- int cpl_coords[AC3_MAX_CHANNELS][18]; ///< coupling coordinates (cplco)
- ///@}
-
-+///@defgroup spx spectral extension
-+///@{
-+ int spx_in_use; ///< spectral extension in use (spxinu)
-+ uint8_t channel_uses_spx[AC3_MAX_CHANNELS]; ///< channel uses spectral extension (chinspx)
-+ int8_t spx_atten_code[AC3_MAX_CHANNELS]; ///< spx attenuation code (spxattencod)
-+ int spx_start_subband; ///< spx beginning frequency band (spxbegf)
-+ int spx_start_freq; ///< spx start frequency bin
-+ int spx_end_freq; ///< spx end frequency bin
-+ int spx_copy_start_freq; ///< spx starting frequency bin for copying (copystartmant)
-+ int num_spx_bands; ///< number of spx bands (nspxbnds)
-+ uint8_t spx_band_struct[SPX_MAX_BANDS]; ///< spectral extension band structure (spxbndstrc)
-+ uint8_t spx_band_sizes[SPX_MAX_BANDS]; ///< number of bins in each band (spxbndsztab)
-+ uint8_t first_spx_coords[AC3_MAX_CHANNELS]; ///< first spx coordinates states (firstspxcos)
-+ float spx_noise_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx noise blending factor (nblendfact)
-+ float spx_signal_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS];///< spx signal blending factor (sblendfact)
-+///@}
-+
- ///@defgroup aht adaptive hybrid transform
- int channel_uses_aht[AC3_MAX_CHANNELS]; ///< channel AHT in use (chahtinu)
- int pre_mantissa[AC3_MAX_CHANNELS][AC3_MAX_COEFS][MAX_BLOCKS]; ///< pre-IDCT mantissas
-@@ -179,4 +197,11 @@ int ff_eac3_parse_header(AC3DecodeContext *s);
- */
- void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch);
-
-+/**
-+ * Apply spectral extension to each channel by copying lower frequency
-+ * coefficients to higher frequency bins and applying side information to
-+ * approximate the original high frequency signal.
-+ */
-+void ff_eac3_apply_spectral_extension(AC3DecodeContext *s);
-+
- #endif /* AVCODEC_AC3DEC_H */
-diff --git a/libavcodec/ac3dec_data.c b/libavcodec/ac3dec_data.c
-index 907a3ae..abe359b 100644
---- a/libavcodec/ac3dec_data.c
-+++ b/libavcodec/ac3dec_data.c
-@@ -64,3 +64,9 @@ const uint8_t ff_eac3_hebap_tab[64] = {
- */
- const uint8_t ff_eac3_default_cpl_band_struct[18] =
- { 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 };
-+
-+/**
-+ * Table E2.15 Default Spectral Extension Banding Structure
-+ */
-+const uint8_t ff_eac3_default_spx_band_struct[17] =
-+{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 };
-diff --git a/libavcodec/ac3dec_data.h b/libavcodec/ac3dec_data.h
-index 8d9db05..9ed7c73 100644
---- a/libavcodec/ac3dec_data.h
-+++ b/libavcodec/ac3dec_data.h
-@@ -29,5 +29,6 @@ extern const uint8_t ff_ac3_rematrix_band_tab[5];
-
- extern const uint8_t ff_eac3_hebap_tab[64];
- extern const uint8_t ff_eac3_default_cpl_band_struct[18];
-+extern const uint8_t ff_eac3_default_spx_band_struct[17];
-
- #endif /* AVCODEC_AC3DEC_DATA_H */
-diff --git a/libavcodec/eac3dec.c b/libavcodec/eac3dec.c
-index 3784ccf..3a78540 100644
---- a/libavcodec/eac3dec.c
-+++ b/libavcodec/eac3dec.c
-@@ -23,10 +23,6 @@
- /*
- * There are several features of E-AC-3 that this decoder does not yet support.
- *
-- * Spectral Extension
-- * There is a patch to get this working for the two samples we have that
-- * use it, but it needs some minor changes in order to be accepted.
-- *
- * Enhanced Coupling
- * No known samples exist. If any ever surface, this feature should not be
- * too difficult to implement.
-@@ -67,6 +63,95 @@ typedef enum {
-
- #define EAC3_SR_CODE_REDUCED 3
-
-+void ff_eac3_apply_spectral_extension(AC3DecodeContext *s)
-+{
-+ int bin, bnd, ch, i;
-+ uint8_t wrapflag[SPX_MAX_BANDS]={1,0,}, num_copy_sections, copy_sizes[SPX_MAX_BANDS];
-+ float rms_energy[SPX_MAX_BANDS];
-+
-+ /* Set copy index mapping table. Set wrap flags to apply a notch filter at
-+ wrap points later on. */
-+ bin = s->spx_copy_start_freq;
-+ num_copy_sections = 0;
-+ for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
-+ int copysize;
-+ int bandsize = s->spx_band_sizes[bnd];
-+ if (bin + bandsize > s->spx_start_freq) {
-+ copy_sizes[num_copy_sections++] = bin - s->spx_copy_start_freq;
-+ bin = s->spx_copy_start_freq;
-+ wrapflag[bnd] = 1;
-+ }
-+ for (i = 0; i < bandsize; i += copysize) {
-+ if (bin == s->spx_start_freq) {
-+ copy_sizes[num_copy_sections++] = bin - s->spx_copy_start_freq;
-+ bin = s->spx_copy_start_freq;
-+ }
-+ copysize = FFMIN(bandsize - i, s->spx_start_freq - bin);
-+ bin += copysize;
-+ }
-+ }
-+ copy_sizes[num_copy_sections++] = bin - s->spx_copy_start_freq;
-+
-+ for (ch = 1; ch <= s->fbw_channels; ch++) {
-+ if (!s->channel_uses_spx[ch])
-+ continue;
-+
-+ /* Copy coeffs from normal bands to extension bands */
-+ bin = s->spx_start_freq;
-+ for (i = 0; i < num_copy_sections; i++) {
-+ memcpy(&s->transform_coeffs[ch][bin],
-+ &s->transform_coeffs[ch][s->spx_copy_start_freq],
-+ copy_sizes[i]*sizeof(float));
-+ bin += copy_sizes[i];
-+ }
-+
-+ /* Calculate RMS energy for each SPX band. */
-+ bin = s->spx_start_freq;
-+ for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
-+ int bandsize = s->spx_band_sizes[bnd];
-+ float accum = 0.0f;
-+ for (i = 0; i < bandsize; i++) {
-+ float coeff = s->transform_coeffs[ch][bin++];
-+ accum += coeff * coeff;
-+ }
-+ rms_energy[bnd] = sqrtf(accum / bandsize);
-+ }
-+
-+ /* Apply a notch filter at transitions between normal and extension
-+ bands and at all wrap points. */
-+ if (s->spx_atten_code[ch] >= 0) {
-+ const float *atten_tab = ff_eac3_spx_atten_tab[s->spx_atten_code[ch]];
-+ bin = s->spx_start_freq - 2;
-+ for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
-+ if (wrapflag[bnd]) {
-+ float *coeffs = &s->transform_coeffs[ch][bin];
-+ coeffs[0] *= atten_tab[0];
-+ coeffs[1] *= atten_tab[1];
-+ coeffs[2] *= atten_tab[2];
-+ coeffs[3] *= atten_tab[1];
-+ coeffs[4] *= atten_tab[0];
-+ }
-+ bin += s->spx_band_sizes[bnd];
-+ }
-+ }
-+
-+ /* Apply noise-blended coefficient scaling based on previously
-+ calculated RMS energy, blending factors, and SPX coordinates for
-+ each band. */
-+ bin = s->spx_start_freq;
-+ for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
-+ float nscale = s->spx_noise_blend[ch][bnd] * rms_energy[bnd] * (1.0f/(1<<31));
-+ float sscale = s->spx_signal_blend[ch][bnd];
-+ for (i = 0; i < s->spx_band_sizes[bnd]; i++) {
-+ float noise = nscale * (int32_t)av_lfg_get(&s->dith_state);
-+ s->transform_coeffs[ch][bin] *= sscale;
-+ s->transform_coeffs[ch][bin++] += noise;
-+ }
-+ }
-+ }
-+}
-+
-+
- /** lrint(M_SQRT2*cos(2*M_PI/12)*(1<<23)) */
- #define COEFF_0 10273905LL
-
-@@ -492,13 +577,11 @@ int ff_eac3_parse_header(AC3DecodeContext *s)
- }
-
- /* spectral extension attenuation data */
-- if (parse_spx_atten_data) {
-- av_log_missing_feature(s->avctx, "Spectral extension attenuation", 1);
-- for (ch = 1; ch <= s->fbw_channels; ch++) {
-- if (get_bits1(gbc)) { // channel has spx attenuation
-- skip_bits(gbc, 5); // skip spx attenuation code
-- }
-- }
-+ for (ch = 1; ch <= s->fbw_channels; ch++) {
-+ if (parse_spx_atten_data && get_bits1(gbc))
-+ s->spx_atten_code[ch] = get_bits(gbc, 5);
-+ else
-+ s->spx_atten_code[ch] = -1;
- }
-
- /* block start information */
-@@ -514,6 +597,7 @@ int ff_eac3_parse_header(AC3DecodeContext *s)
-
- /* syntax state initialization */
- for (ch = 1; ch <= s->fbw_channels; ch++) {
-+ s->first_spx_coords[ch] = 1;
- s->first_cpl_coords[ch] = 1;
- }
- s->first_cpl_leak = 1;
-diff --git a/libavcodec/eac3dec_data.c b/libavcodec/eac3dec_data.c
-index 6c6a551..9e9f8a2 100644
---- a/libavcodec/eac3dec_data.c
-+++ b/libavcodec/eac3dec_data.c
-@@ -1093,3 +1093,42 @@ const uint8_t ff_eac3_frm_expstr[32][6] = {
- { EXP_D45, EXP_D45, EXP_D45, EXP_D45, EXP_D25, EXP_REUSE},
- { EXP_D45, EXP_D45, EXP_D45, EXP_D45, EXP_D45, EXP_D45},
- };
-+
-+/**
-+ * Table E.25: Spectral Extension Attenuation Table
-+ * ff_eac3_spx_atten_tab[code][bin]=pow(2.0,(bin+1)*(code+1)/-15.0);
-+ */
-+const float ff_eac3_spx_atten_tab[32][3] = {
-+ { 0.954841603910416503f, 0.911722488558216804f, 0.870550563296124125f },
-+ { 0.911722488558216804f, 0.831237896142787758f, 0.757858283255198995f },
-+ { 0.870550563296124125f, 0.757858283255198995f, 0.659753955386447100f },
-+ { 0.831237896142787758f, 0.690956439983888004f, 0.574349177498517438f },
-+ { 0.793700525984099792f, 0.629960524947436595f, 0.500000000000000000f },
-+ { 0.757858283255198995f, 0.574349177498517438f, 0.435275281648062062f },
-+ { 0.723634618720189082f, 0.523647061410313364f, 0.378929141627599553f },
-+ { 0.690956439983888004f, 0.477420801955208307f, 0.329876977693223550f },
-+ { 0.659753955386447100f, 0.435275281648062062f, 0.287174588749258719f },
-+ { 0.629960524947436595f, 0.396850262992049896f, 0.250000000000000000f },
-+ { 0.601512518041058319f, 0.361817309360094541f, 0.217637640824031003f },
-+ { 0.574349177498517438f, 0.329876977693223550f, 0.189464570813799776f },
-+ { 0.548412489847312945f, 0.300756259020529160f, 0.164938488846611775f },
-+ { 0.523647061410313364f, 0.274206244923656473f, 0.143587294374629387f },
-+ { 0.500000000000000000f, 0.250000000000000000f, 0.125000000000000000f },
-+ { 0.477420801955208307f, 0.227930622139554201f, 0.108818820412015502f },
-+ { 0.455861244279108402f, 0.207809474035696939f, 0.094732285406899888f },
-+ { 0.435275281648062062f, 0.189464570813799776f, 0.082469244423305887f },
-+ { 0.415618948071393879f, 0.172739109995972029f, 0.071793647187314694f },
-+ { 0.396850262992049896f, 0.157490131236859149f, 0.062500000000000000f },
-+ { 0.378929141627599553f, 0.143587294374629387f, 0.054409410206007751f },
-+ { 0.361817309360094541f, 0.130911765352578369f, 0.047366142703449930f },
-+ { 0.345478219991944002f, 0.119355200488802049f, 0.041234622211652958f },
-+ { 0.329876977693223550f, 0.108818820412015502f, 0.035896823593657347f },
-+ { 0.314980262473718298f, 0.099212565748012460f, 0.031250000000000000f },
-+ { 0.300756259020529160f, 0.090454327340023621f, 0.027204705103003875f },
-+ { 0.287174588749258719f, 0.082469244423305887f, 0.023683071351724965f },
-+ { 0.274206244923656473f, 0.075189064755132290f, 0.020617311105826479f },
-+ { 0.261823530705156682f, 0.068551561230914118f, 0.017948411796828673f },
-+ { 0.250000000000000000f, 0.062500000000000000f, 0.015625000000000000f },
-+ { 0.238710400977604098f, 0.056982655534888536f, 0.013602352551501938f },
-+ { 0.227930622139554201f, 0.051952368508924235f, 0.011841535675862483f }
-+};
-diff --git a/libavcodec/eac3dec_data.h b/libavcodec/eac3dec_data.h
-index 76dd154..1331833 100644
---- a/libavcodec/eac3dec_data.h
-+++ b/libavcodec/eac3dec_data.h
-@@ -31,5 +31,6 @@ extern const int16_t ff_eac3_gaq_remap_2_4_b[9][2];
-
- extern const int16_t (* const ff_eac3_mantissa_vq[8])[6];
- extern const uint8_t ff_eac3_frm_expstr[32][6];
-+extern const float ff_eac3_spx_atten_tab[32][3];
-
- #endif /* AVCODEC_EAC3DEC_DATA_H */
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