From 23c8cb89c90a3b8273b4101222b1fe2c1e727f4f Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Sun, 30 Dec 2007 20:47:22 +0000 Subject: [PATCH] cosmetics: rename GetBitContext gb to gbc Originally committed as revision 11354 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/ac3dec.c | 166 ++++++++++++++++++++++++++-------------------------- 1 file changed, 83 insertions(+), 83 deletions(-) diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 53f88f4..32eb074 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -188,7 +188,7 @@ typedef struct { DECLARE_ALIGNED_16(float, window[256]); ///< window coefficients /* Miscellaneous. */ - GetBitContext gb; ///< bitstream reader + GetBitContext gbc; ///< bitstream reader AVRandomState dith_state; ///< for dither generation AVCodecContext *avctx; ///< parent context } AC3DecodeContext; @@ -322,11 +322,11 @@ static int ac3_decode_init(AVCodecContext *avctx) static int ac3_parse_header(AC3DecodeContext *ctx) { AC3HeaderInfo hdr; - GetBitContext *gb = &ctx->gb; + GetBitContext *gbc = &ctx->gbc; float center_mix_level, surround_mix_level; int err, i; - err = ff_ac3_parse_header(gb->buffer, &hdr); + err = ff_ac3_parse_header(gbc->buffer, &hdr); if(err) return err; @@ -351,46 +351,46 @@ static int ac3_parse_header(AC3DecodeContext *ctx) ctx->output_mode |= AC3_OUTPUT_LFEON; /* skip over portion of header which has already been read */ - skip_bits(gb, 16); // skip the sync_word - skip_bits(gb, 16); // skip crc1 - skip_bits(gb, 8); // skip fscod and frmsizecod - skip_bits(gb, 11); // skip bsid, bsmod, and acmod + skip_bits(gbc, 16); // skip the sync_word + skip_bits(gbc, 16); // skip crc1 + skip_bits(gbc, 8); // skip fscod and frmsizecod + skip_bits(gbc, 11); // skip bsid, bsmod, and acmod if(ctx->channel_mode == AC3_CHMODE_STEREO) { - skip_bits(gb, 2); // skip dsurmod + skip_bits(gbc, 2); // skip dsurmod } else { if((ctx->channel_mode & 1) && ctx->channel_mode != AC3_CHMODE_MONO) - skip_bits(gb, 2); // skip cmixlev + skip_bits(gbc, 2); // skip cmixlev if(ctx->channel_mode & 4) - skip_bits(gb, 2); // skip surmixlev + skip_bits(gbc, 2); // skip surmixlev } - skip_bits1(gb); // skip lfeon + skip_bits1(gbc); // skip lfeon /* read the rest of the bsi. read twice for dual mono mode. */ i = !(ctx->channel_mode); do { - skip_bits(gb, 5); // skip dialog normalization - if (get_bits1(gb)) - skip_bits(gb, 8); //skip compression - if (get_bits1(gb)) - skip_bits(gb, 8); //skip language code - if (get_bits1(gb)) - skip_bits(gb, 7); //skip audio production information + skip_bits(gbc, 5); // skip dialog normalization + if (get_bits1(gbc)) + skip_bits(gbc, 8); //skip compression + if (get_bits1(gbc)) + skip_bits(gbc, 8); //skip language code + if (get_bits1(gbc)) + skip_bits(gbc, 7); //skip audio production information } while (i--); - skip_bits(gb, 2); //skip copyright bit and original bitstream bit + skip_bits(gbc, 2); //skip copyright bit and original bitstream bit /* skip the timecodes (or extra bitstream information for Alternate Syntax) TODO: read & use the xbsi1 downmix levels */ - if (get_bits1(gb)) - skip_bits(gb, 14); //skip timecode1 / xbsi1 - if (get_bits1(gb)) - skip_bits(gb, 14); //skip timecode2 / xbsi2 + if (get_bits1(gbc)) + skip_bits(gbc, 14); //skip timecode1 / xbsi1 + if (get_bits1(gbc)) + skip_bits(gbc, 14); //skip timecode2 / xbsi2 /* skip additional bitstream info */ - if (get_bits1(gb)) { - i = get_bits(gb, 6); + if (get_bits1(gbc)) { + i = get_bits(gbc, 6); do { - skip_bits(gb, 8); + skip_bits(gbc, 8); } while(i--); } @@ -419,7 +419,7 @@ static int ac3_parse_header(AC3DecodeContext *ctx) * Decode the grouped exponents according to exponent strategy. * reference: Section 7.1.3 Exponent Decoding */ -static void decode_exponents(GetBitContext *gb, int exp_strategy, int ngrps, +static void decode_exponents(GetBitContext *gbc, int exp_strategy, int ngrps, uint8_t absexp, int8_t *dexps) { int i, j, grp, group_size; @@ -429,7 +429,7 @@ static void decode_exponents(GetBitContext *gb, int exp_strategy, int ngrps, /* unpack groups */ group_size = exp_strategy + (exp_strategy == EXP_D45); for(grp=0,i=0; grpgb; + GetBitContext *gbc = &ctx->gbc; int i, gcode, tbap, start, end; uint8_t *exps; uint8_t *bap; @@ -509,7 +509,7 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro case 1: if(m->b1ptr > 2) { - gcode = get_bits(gb, 5); + gcode = get_bits(gbc, 5); m->b1_mant[0] = b1_mantissas[gcode][0]; m->b1_mant[1] = b1_mantissas[gcode][1]; m->b1_mant[2] = b1_mantissas[gcode][2]; @@ -520,7 +520,7 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro case 2: if(m->b2ptr > 2) { - gcode = get_bits(gb, 7); + gcode = get_bits(gbc, 7); m->b2_mant[0] = b2_mantissas[gcode][0]; m->b2_mant[1] = b2_mantissas[gcode][1]; m->b2_mant[2] = b2_mantissas[gcode][2]; @@ -530,12 +530,12 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro break; case 3: - coeffs[i] = b3_mantissas[get_bits(gb, 3)]; + coeffs[i] = b3_mantissas[get_bits(gbc, 3)]; break; case 4: if(m->b4ptr > 1) { - gcode = get_bits(gb, 7); + gcode = get_bits(gbc, 7); m->b4_mant[0] = b4_mantissas[gcode][0]; m->b4_mant[1] = b4_mantissas[gcode][1]; m->b4ptr = 0; @@ -544,12 +544,12 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro break; case 5: - coeffs[i] = b5_mantissas[get_bits(gb, 4)]; + coeffs[i] = b5_mantissas[get_bits(gbc, 4)]; break; default: /* asymmetric dequantization */ - coeffs[i] = get_sbits(gb, quantization_tab[tbap]) * scale_factors[quantization_tab[tbap]-1]; + coeffs[i] = get_sbits(gbc, quantization_tab[tbap]) * scale_factors[quantization_tab[tbap]-1]; break; } coeffs[i] *= scale_factors[exps[i]]; @@ -769,19 +769,19 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) int fbw_channels = ctx->fbw_channels; int channel_mode = ctx->channel_mode; int i, bnd, seg, ch; - GetBitContext *gb = &ctx->gb; + GetBitContext *gbc = &ctx->gbc; uint8_t bit_alloc_stages[AC3_MAX_CHANNELS]; memset(bit_alloc_stages, 0, AC3_MAX_CHANNELS); /* block switch flags */ for (ch = 1; ch <= fbw_channels; ch++) - ctx->block_switch[ch] = get_bits1(gb); + ctx->block_switch[ch] = get_bits1(gbc); /* dithering flags */ ctx->dither_all = 1; for (ch = 1; ch <= fbw_channels; ch++) { - ctx->dither_flag[ch] = get_bits1(gb); + ctx->dither_flag[ch] = get_bits1(gbc); if(!ctx->dither_flag[ch]) ctx->dither_all = 0; } @@ -789,8 +789,8 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) /* dynamic range */ i = !(ctx->channel_mode); do { - if(get_bits1(gb)) { - ctx->dynamic_range[i] = ((dynamic_range_tab[get_bits(gb, 8)]-1.0) * + if(get_bits1(gbc)) { + ctx->dynamic_range[i] = ((dynamic_range_tab[get_bits(gbc, 8)]-1.0) * ctx->avctx->drc_scale)+1.0; } else if(blk == 0) { ctx->dynamic_range[i] = 1.0f; @@ -798,24 +798,24 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) } while(i--); /* coupling strategy */ - if (get_bits1(gb)) { + if (get_bits1(gbc)) { memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS); - ctx->cpl_in_use = get_bits1(gb); + ctx->cpl_in_use = get_bits1(gbc); if (ctx->cpl_in_use) { /* coupling in use */ int cpl_begin_freq, cpl_end_freq; /* determine which channels are coupled */ for (ch = 1; ch <= fbw_channels; ch++) - ctx->channel_in_cpl[ch] = get_bits1(gb); + ctx->channel_in_cpl[ch] = get_bits1(gbc); /* phase flags in use */ if (channel_mode == AC3_CHMODE_STEREO) - ctx->phase_flags_in_use = get_bits1(gb); + ctx->phase_flags_in_use = get_bits1(gbc); /* coupling frequency range and band structure */ - cpl_begin_freq = get_bits(gb, 4); - cpl_end_freq = get_bits(gb, 4); + cpl_begin_freq = get_bits(gbc, 4); + cpl_end_freq = get_bits(gbc, 4); if (3 + cpl_end_freq - cpl_begin_freq < 0) { av_log(ctx->avctx, AV_LOG_ERROR, "3+cplendf = %d < cplbegf = %d\n", 3+cpl_end_freq, cpl_begin_freq); return -1; @@ -824,7 +824,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) ctx->start_freq[CPL_CH] = cpl_begin_freq * 12 + 37; ctx->end_freq[CPL_CH] = cpl_end_freq * 12 + 73; for (bnd = 0; bnd < ctx->num_cpl_subbands - 1; bnd++) { - if (get_bits1(gb)) { + if (get_bits1(gbc)) { ctx->cpl_band_struct[bnd] = 1; ctx->num_cpl_bands--; } @@ -842,13 +842,13 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) for (ch = 1; ch <= fbw_channels; ch++) { if (ctx->channel_in_cpl[ch]) { - if (get_bits1(gb)) { + if (get_bits1(gbc)) { int master_cpl_coord, cpl_coord_exp, cpl_coord_mant; cpl_coords_exist = 1; - master_cpl_coord = 3 * get_bits(gb, 2); + master_cpl_coord = 3 * get_bits(gbc, 2); for (bnd = 0; bnd < ctx->num_cpl_bands; bnd++) { - cpl_coord_exp = get_bits(gb, 4); - cpl_coord_mant = get_bits(gb, 4); + cpl_coord_exp = get_bits(gbc, 4); + cpl_coord_mant = get_bits(gbc, 4); if (cpl_coord_exp == 15) ctx->cpl_coords[ch][bnd] = cpl_coord_mant / 16.0f; else @@ -861,7 +861,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) /* phase flags */ if (channel_mode == AC3_CHMODE_STEREO && ctx->phase_flags_in_use && cpl_coords_exist) { for (bnd = 0; bnd < ctx->num_cpl_bands; bnd++) { - if (get_bits1(gb)) + if (get_bits1(gbc)) ctx->cpl_coords[2][bnd] = -ctx->cpl_coords[2][bnd]; } } @@ -869,13 +869,13 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) /* stereo rematrixing strategy and band structure */ if (channel_mode == AC3_CHMODE_STEREO) { - ctx->rematrixing_strategy = get_bits1(gb); + ctx->rematrixing_strategy = get_bits1(gbc); if (ctx->rematrixing_strategy) { ctx->num_rematrixing_bands = 4; if(ctx->cpl_in_use && ctx->start_freq[CPL_CH] <= 61) ctx->num_rematrixing_bands -= 1 + (ctx->start_freq[CPL_CH] == 37); for(bnd=0; bndnum_rematrixing_bands; bnd++) - ctx->rematrixing_flags[bnd] = get_bits1(gb); + ctx->rematrixing_flags[bnd] = get_bits1(gbc); } } @@ -884,9 +884,9 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) ctx->exp_strategy[ctx->lfe_ch] = EXP_REUSE; for (ch = !ctx->cpl_in_use; ch <= ctx->channels; ch++) { if(ch == ctx->lfe_ch) - ctx->exp_strategy[ch] = get_bits(gb, 1); + ctx->exp_strategy[ch] = get_bits(gbc, 1); else - ctx->exp_strategy[ch] = get_bits(gb, 2); + ctx->exp_strategy[ch] = get_bits(gbc, 2); if(ctx->exp_strategy[ch] != EXP_REUSE) bit_alloc_stages[ch] = 3; } @@ -899,7 +899,7 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) if (ctx->channel_in_cpl[ch]) ctx->end_freq[ch] = ctx->start_freq[CPL_CH]; else { - int bandwidth_code = get_bits(gb, 6); + int bandwidth_code = get_bits(gbc, 6); if (bandwidth_code > 60) { av_log(ctx->avctx, AV_LOG_ERROR, "bandwidth code = %d > 60", bandwidth_code); return -1; @@ -924,49 +924,49 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) num_groups = 2; else num_groups = (ctx->end_freq[ch] + group_size - 4) / group_size; - ctx->dexps[ch][0] = get_bits(gb, 4) << !ch; - decode_exponents(gb, ctx->exp_strategy[ch], num_groups, ctx->dexps[ch][0], + ctx->dexps[ch][0] = get_bits(gbc, 4) << !ch; + decode_exponents(gbc, ctx->exp_strategy[ch], num_groups, ctx->dexps[ch][0], &ctx->dexps[ch][ctx->start_freq[ch]+!!ch]); if(ch != CPL_CH && ch != ctx->lfe_ch) - skip_bits(gb, 2); /* skip gainrng */ + skip_bits(gbc, 2); /* skip gainrng */ } } /* bit allocation information */ - if (get_bits1(gb)) { - ctx->bit_alloc_params.slow_decay = ff_ac3_slow_decay_tab[get_bits(gb, 2)] >> ctx->bit_alloc_params.sr_shift; - ctx->bit_alloc_params.fast_decay = ff_ac3_fast_decay_tab[get_bits(gb, 2)] >> ctx->bit_alloc_params.sr_shift; - ctx->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gb, 2)]; - ctx->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gb, 2)]; - ctx->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gb, 3)]; + if (get_bits1(gbc)) { + ctx->bit_alloc_params.slow_decay = ff_ac3_slow_decay_tab[get_bits(gbc, 2)] >> ctx->bit_alloc_params.sr_shift; + ctx->bit_alloc_params.fast_decay = ff_ac3_fast_decay_tab[get_bits(gbc, 2)] >> ctx->bit_alloc_params.sr_shift; + ctx->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gbc, 2)]; + ctx->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gbc, 2)]; + ctx->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gbc, 3)]; for(ch=!ctx->cpl_in_use; ch<=ctx->channels; ch++) { bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2); } } /* signal-to-noise ratio offsets and fast gains (signal-to-mask ratios) */ - if (get_bits1(gb)) { + if (get_bits1(gbc)) { int csnr; - csnr = (get_bits(gb, 6) - 15) << 4; + csnr = (get_bits(gbc, 6) - 15) << 4; for (ch = !ctx->cpl_in_use; ch <= ctx->channels; ch++) { /* snr offset and fast gain */ - ctx->snr_offset[ch] = (csnr + get_bits(gb, 4)) << 2; - ctx->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gb, 3)]; + ctx->snr_offset[ch] = (csnr + get_bits(gbc, 4)) << 2; + ctx->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gbc, 3)]; } memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS); } /* coupling leak information */ - if (ctx->cpl_in_use && get_bits1(gb)) { - ctx->bit_alloc_params.cpl_fast_leak = get_bits(gb, 3); - ctx->bit_alloc_params.cpl_slow_leak = get_bits(gb, 3); + if (ctx->cpl_in_use && get_bits1(gbc)) { + ctx->bit_alloc_params.cpl_fast_leak = get_bits(gbc, 3); + ctx->bit_alloc_params.cpl_slow_leak = get_bits(gbc, 3); bit_alloc_stages[CPL_CH] = FFMAX(bit_alloc_stages[CPL_CH], 2); } /* delta bit allocation information */ - if (get_bits1(gb)) { + if (get_bits1(gbc)) { /* delta bit allocation exists (strategy) */ for (ch = !ctx->cpl_in_use; ch <= fbw_channels; ch++) { - ctx->dba_mode[ch] = get_bits(gb, 2); + ctx->dba_mode[ch] = get_bits(gbc, 2); if (ctx->dba_mode[ch] == DBA_RESERVED) { av_log(ctx->avctx, AV_LOG_ERROR, "delta bit allocation strategy reserved\n"); return -1; @@ -976,11 +976,11 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) /* channel delta offset, len and bit allocation */ for (ch = !ctx->cpl_in_use; ch <= fbw_channels; ch++) { if (ctx->dba_mode[ch] == DBA_NEW) { - ctx->dba_nsegs[ch] = get_bits(gb, 3); + ctx->dba_nsegs[ch] = get_bits(gbc, 3); for (seg = 0; seg <= ctx->dba_nsegs[ch]; seg++) { - ctx->dba_offsets[ch][seg] = get_bits(gb, 5); - ctx->dba_lengths[ch][seg] = get_bits(gb, 4); - ctx->dba_values[ch][seg] = get_bits(gb, 3); + ctx->dba_offsets[ch][seg] = get_bits(gbc, 5); + ctx->dba_lengths[ch][seg] = get_bits(gbc, 4); + ctx->dba_values[ch][seg] = get_bits(gbc, 3); } } } @@ -1019,10 +1019,10 @@ static int ac3_parse_audio_block(AC3DecodeContext *ctx, int blk) } /* unused dummy data */ - if (get_bits1(gb)) { - int skipl = get_bits(gb, 9); + if (get_bits1(gbc)) { + int skipl = get_bits(gbc, 9); while(skipl--) - skip_bits(gb, 8); + skip_bits(gbc, 8); } /* unpack the transform coefficients @@ -1079,7 +1079,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size, int i, blk, ch, err; /* initialize the GetBitContext with the start of valid AC-3 Frame */ - init_get_bits(&ctx->gb, buf, buf_size * 8); + init_get_bits(&ctx->gbc, buf, buf_size * 8); /* parse the syncinfo */ err = ac3_parse_header(ctx); -- 2.7.4