diff options
Diffstat (limited to 'ffmpeg/libavcodec/ac3enc_fixed.c')
| -rw-r--r-- | ffmpeg/libavcodec/ac3enc_fixed.c | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/ffmpeg/libavcodec/ac3enc_fixed.c b/ffmpeg/libavcodec/ac3enc_fixed.c deleted file mode 100644 index 5194d42..0000000 --- a/ffmpeg/libavcodec/ac3enc_fixed.c +++ /dev/null @@ -1,158 +0,0 @@ -/* - * The simplest AC-3 encoder - * Copyright (c) 2000 Fabrice Bellard - * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> - * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> - * - * This file is part of FFmpeg. - * - * 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. - * - * 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 FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * fixed-point AC-3 encoder. - */ - -#define CONFIG_FFT_FLOAT 0 -#undef CONFIG_AC3ENC_FLOAT -#include "internal.h" -#include "ac3enc.h" -#include "eac3enc.h" - -#define AC3ENC_TYPE AC3ENC_TYPE_AC3_FIXED -#include "ac3enc_opts_template.c" - -static const AVClass ac3enc_class = { - .class_name = "Fixed-Point AC-3 Encoder", - .item_name = av_default_item_name, - .option = ac3_options, - .version = LIBAVUTIL_VERSION_INT, -}; - -#include "ac3enc_template.c" - - -/** - * Finalize MDCT and free allocated memory. - * - * @param s AC-3 encoder private context - */ -av_cold void AC3_NAME(mdct_end)(AC3EncodeContext *s) -{ - ff_mdct_end(&s->mdct); -} - - -/** - * Initialize MDCT tables. - * - * @param s AC-3 encoder private context - * @return 0 on success, negative error code on failure - */ -av_cold int AC3_NAME(mdct_init)(AC3EncodeContext *s) -{ - int ret = ff_mdct_init(&s->mdct, 9, 0, -1.0); - s->mdct_window = ff_ac3_window; - return ret; -} - - -/* - * Normalize the input samples to use the maximum available precision. - * This assumes signed 16-bit input samples. - */ -static int normalize_samples(AC3EncodeContext *s) -{ - int v = s->ac3dsp.ac3_max_msb_abs_int16(s->windowed_samples, AC3_WINDOW_SIZE); - v = 14 - av_log2(v); - if (v > 0) - s->ac3dsp.ac3_lshift_int16(s->windowed_samples, AC3_WINDOW_SIZE, v); - /* +6 to right-shift from 31-bit to 25-bit */ - return v + 6; -} - - -/* - * Scale MDCT coefficients to 25-bit signed fixed-point. - */ -static void scale_coefficients(AC3EncodeContext *s) -{ - int blk, ch; - - for (blk = 0; blk < s->num_blocks; blk++) { - AC3Block *block = &s->blocks[blk]; - for (ch = 1; ch <= s->channels; ch++) { - s->ac3dsp.ac3_rshift_int32(block->mdct_coef[ch], AC3_MAX_COEFS, - block->coeff_shift[ch]); - } - } -} - -static void sum_square_butterfly(AC3EncodeContext *s, int64_t sum[4], - const int32_t *coef0, const int32_t *coef1, - int len) -{ - s->ac3dsp.sum_square_butterfly_int32(sum, coef0, coef1, len); -} - -/* - * Clip MDCT coefficients to allowable range. - */ -static void clip_coefficients(DSPContext *dsp, int32_t *coef, unsigned int len) -{ - dsp->vector_clip_int32(coef, coef, COEF_MIN, COEF_MAX, len); -} - - -/* - * Calculate a single coupling coordinate. - */ -static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl) -{ - if (energy_cpl <= COEF_MAX) { - return 1048576; - } else { - uint64_t coord = energy_ch / (energy_cpl >> 24); - uint32_t coord32 = FFMIN(coord, 1073741824); - coord32 = ff_sqrt(coord32) << 9; - return FFMIN(coord32, COEF_MAX); - } -} - - -static av_cold int ac3_fixed_encode_init(AVCodecContext *avctx) -{ - AC3EncodeContext *s = avctx->priv_data; - s->fixed_point = 1; - return ff_ac3_encode_init(avctx); -} - - -AVCodec ff_ac3_fixed_encoder = { - .name = "ac3_fixed", - .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_AC3, - .priv_data_size = sizeof(AC3EncodeContext), - .init = ac3_fixed_encode_init, - .encode2 = ff_ac3_fixed_encode_frame, - .close = ff_ac3_encode_close, - .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P, - AV_SAMPLE_FMT_NONE }, - .priv_class = &ac3enc_class, - .channel_layouts = ff_ac3_channel_layouts, - .defaults = ac3_defaults, -}; |