diff options
Diffstat (limited to 'ffmpeg1/libavcodec/ac3enc_float.c')
| -rw-r--r-- | ffmpeg1/libavcodec/ac3enc_float.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/ffmpeg1/libavcodec/ac3enc_float.c b/ffmpeg1/libavcodec/ac3enc_float.c deleted file mode 100644 index 7864f41..0000000 --- a/ffmpeg1/libavcodec/ac3enc_float.c +++ /dev/null @@ -1,168 +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 - * floating-point AC-3 encoder. - */ - -#define CONFIG_AC3ENC_FLOAT 1 -#include "internal.h" -#include "ac3enc.h" -#include "eac3enc.h" -#include "kbdwin.h" - - -#if CONFIG_AC3_ENCODER -#define AC3ENC_TYPE AC3ENC_TYPE_AC3 -#include "ac3enc_opts_template.c" -static const AVClass ac3enc_class = { - .class_name = "AC-3 Encoder", - .item_name = av_default_item_name, - .option = ac3_options, - .version = LIBAVUTIL_VERSION_INT, -}; -#endif - -#include "ac3enc_template.c" - - -/** - * Finalize MDCT and free allocated memory. - * - * @param s AC-3 encoder private context - */ -av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s) -{ - ff_mdct_end(&s->mdct); - av_freep(&s->mdct_window); -} - - -/** - * Initialize MDCT tables. - * - * @param s AC-3 encoder private context - * @return 0 on success, negative error code on failure - */ -av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s) -{ - float *window; - int i, n, n2; - - n = 1 << 9; - n2 = n >> 1; - - window = av_malloc(n * sizeof(*window)); - if (!window) { - av_log(s->avctx, AV_LOG_ERROR, "Cannot allocate memory.\n"); - return AVERROR(ENOMEM); - } - ff_kbd_window_init(window, 5.0, n2); - for (i = 0; i < n2; i++) - window[n-1-i] = window[i]; - s->mdct_window = window; - - return ff_mdct_init(&s->mdct, 9, 0, -2.0 / n); -} - - -/* - * Apply KBD window to input samples prior to MDCT. - */ -static void apply_window(void *dsp, float *output, - const float *input, const float *window, - unsigned int len) -{ - AVFloatDSPContext *fdsp = dsp; - fdsp->vector_fmul(output, input, window, len); -} - - -/* - * Normalize the input samples. - * Not needed for the floating-point encoder. - */ -static int normalize_samples(AC3EncodeContext *s) -{ - return 0; -} - - -/* - * Scale MDCT coefficients from float to 24-bit fixed-point. - */ -static void scale_coefficients(AC3EncodeContext *s) -{ - int chan_size = AC3_MAX_COEFS * s->num_blocks; - int cpl = s->cpl_on; - s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + (chan_size * !cpl), - s->mdct_coef_buffer + (chan_size * !cpl), - chan_size * (s->channels + cpl)); -} - -static void sum_square_butterfly(AC3EncodeContext *s, float sum[4], - const float *coef0, const float *coef1, - int len) -{ - s->ac3dsp.sum_square_butterfly_float(sum, coef0, coef1, len); -} - -/* - * Clip MDCT coefficients to allowable range. - */ -static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len) -{ - dsp->vector_clipf(coef, coef, COEF_MIN, COEF_MAX, len); -} - - -/* - * Calculate a single coupling coordinate. - */ -static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl) -{ - float coord = 0.125; - if (energy_cpl > 0) - coord *= sqrtf(energy_ch / energy_cpl); - return FFMIN(coord, COEF_MAX); -} - - -#if CONFIG_AC3_ENCODER -AVCodec ff_ac3_encoder = { - .name = "ac3", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_AC3, - .priv_data_size = sizeof(AC3EncodeContext), - .init = ff_ac3_encode_init, - .encode2 = ff_ac3_float_encode_frame, - .close = ff_ac3_encode_close, - .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, - AV_SAMPLE_FMT_NONE }, - .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"), - .priv_class = &ac3enc_class, - .channel_layouts = ff_ac3_channel_layouts, - .defaults = ac3_defaults, -}; -#endif |