diff options
Diffstat (limited to 'libavcodec/eac3dec.c')
| -rw-r--r-- | libavcodec/eac3dec.c | 56 |
1 files changed, 32 insertions, 24 deletions
diff --git a/libavcodec/eac3dec.c b/libavcodec/eac3dec.c index 89db7d3..fe97d29 100644 --- a/libavcodec/eac3dec.c +++ b/libavcodec/eac3dec.c @@ -3,20 +3,20 @@ * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com> * Copyright (c) 2008 Justin Ruggles * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -62,7 +62,7 @@ typedef enum { #define EAC3_SR_CODE_REDUCED 3 -void ff_eac3_apply_spectral_extension(AC3DecodeContext *s) +static 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]; @@ -100,7 +100,7 @@ void ff_eac3_apply_spectral_extension(AC3DecodeContext *s) for (i = 0; i < num_copy_sections; i++) { memcpy(&s->transform_coeffs[ch][bin], &s->transform_coeffs[ch][s->spx_dst_start_freq], - copy_sizes[i]*sizeof(float)); + copy_sizes[i]*sizeof(INTFLOAT)); bin += copy_sizes[i]; } @@ -123,7 +123,7 @@ void ff_eac3_apply_spectral_extension(AC3DecodeContext *s) bin = s->spx_src_start_freq - 2; for (bnd = 0; bnd < s->num_spx_bands; bnd++) { if (wrapflag[bnd]) { - float *coeffs = &s->transform_coeffs[ch][bin]; + INTFLOAT *coeffs = &s->transform_coeffs[ch][bin]; coeffs[0] *= atten_tab[0]; coeffs[1] *= atten_tab[1]; coeffs[2] *= atten_tab[2]; @@ -141,6 +141,11 @@ void ff_eac3_apply_spectral_extension(AC3DecodeContext *s) for (bnd = 0; bnd < s->num_spx_bands; bnd++) { float nscale = s->spx_noise_blend[ch][bnd] * rms_energy[bnd] * (1.0f / INT32_MIN); float sscale = s->spx_signal_blend[ch][bnd]; +#if USE_FIXED + // spx_noise_blend and spx_signal_blend are both FP.23 + nscale *= 1.0 / (1<<23); + sscale *= 1.0 / (1<<23); +#endif 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; @@ -194,7 +199,7 @@ static void idct6(int pre_mant[6]) pre_mant[5] = even0 - odd0; } -void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch) +static void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch) { int bin, blk, gs; int end_bap, gaq_mode; @@ -246,7 +251,7 @@ void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch) /* Vector Quantization */ int v = get_bits(gbc, bits); for (blk = 0; blk < 6; blk++) { - s->pre_mantissa[ch][bin][blk] = ff_eac3_mantissa_vq[hebap][v][blk] << 8; + s->pre_mantissa[ch][bin][blk] = ff_eac3_mantissa_vq[hebap][v][blk] * (1 << 8); } } else { /* Gain Adaptive Quantization */ @@ -265,16 +270,16 @@ void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch) int b; int mbits = bits - (2 - log_gain); mant = get_sbits(gbc, mbits); - mant <<= (23 - (mbits - 1)); + mant = ((unsigned)mant) << (23 - (mbits - 1)); /* remap mantissa value to correct for asymmetric quantization */ if (mant >= 0) b = 1 << (23 - log_gain); else - b = ff_eac3_gaq_remap_2_4_b[hebap-8][log_gain-1] << 8; + b = ff_eac3_gaq_remap_2_4_b[hebap-8][log_gain-1] * (1 << 8); mant += ((ff_eac3_gaq_remap_2_4_a[hebap-8][log_gain-1] * (int64_t)mant) >> 15) + b; } else { /* small mantissa, no GAQ, or Gk=1 */ - mant <<= 24 - bits; + mant *= (1 << 24 - bits); if (!log_gain) { /* remap mantissa value for no GAQ or Gk=1 */ mant += (ff_eac3_gaq_remap_1[hebap-8] * (int64_t)mant) >> 15; @@ -287,7 +292,7 @@ void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch) } } -int ff_eac3_parse_header(AC3DecodeContext *s) +static int ff_eac3_parse_header(AC3DecodeContext *s) { int i, blk, ch; int ac3_exponent_strategy, parse_aht_info, parse_spx_atten_data; @@ -298,13 +303,7 @@ int ff_eac3_parse_header(AC3DecodeContext *s) /* An E-AC-3 stream can have multiple independent streams which the application can select from. each independent stream can also contain dependent streams which are used to add or replace channels. */ - if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT) { - if (!s->eac3_frame_dependent_found) { - s->eac3_frame_dependent_found = 1; - avpriv_request_sample(s->avctx, "Dependent substream decoding"); - } - return AAC_AC3_PARSE_ERROR_FRAME_TYPE; - } else if (s->frame_type == EAC3_FRAME_TYPE_RESERVED) { + if (s->frame_type == EAC3_FRAME_TYPE_RESERVED) { av_log(s->avctx, AV_LOG_ERROR, "Reserved frame type\n"); return AAC_AC3_PARSE_ERROR_FRAME_TYPE; } @@ -333,16 +332,25 @@ int ff_eac3_parse_header(AC3DecodeContext *s) /* volume control params */ for (i = 0; i < (s->channel_mode ? 1 : 2); i++) { - skip_bits(gbc, 5); // skip dialog normalization - if (get_bits1(gbc)) { - skip_bits(gbc, 8); // skip compression gain word + s->dialog_normalization[i] = -get_bits(gbc, 5); + if (s->dialog_normalization[i] == 0) { + s->dialog_normalization[i] = -31; + } + if (s->target_level != 0) { + s->level_gain[i] = powf(2.0f, + (float)(s->target_level - s->dialog_normalization[i])/6.0f); + } + s->compression_exists[i] = get_bits1(gbc); + if (s->compression_exists[i]) { + s->heavy_dynamic_range[i] = AC3_HEAVY_RANGE(get_bits(gbc, 8)); } } /* dependent stream channel map */ if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT) { if (get_bits1(gbc)) { - skip_bits(gbc, 16); // skip custom channel map + s->channel_map = get_bits(gbc, 16); + av_log(s->avctx, AV_LOG_DEBUG, "channel_map: %0X\n", s->channel_map); } } |
