LCOV - code coverage report
Current view: top level - src/libavcodec - ac3enc_float.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 37 42 88.1 %
Date: 2017-01-23 11:54:22 Functions: 7 8 87.5 %

          Line data    Source code
       1             : /*
       2             :  * The simplest AC-3 encoder
       3             :  * Copyright (c) 2000 Fabrice Bellard
       4             :  * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
       5             :  * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
       6             :  *
       7             :  * This file is part of FFmpeg.
       8             :  *
       9             :  * FFmpeg is free software; you can redistribute it and/or
      10             :  * modify it under the terms of the GNU Lesser General Public
      11             :  * License as published by the Free Software Foundation; either
      12             :  * version 2.1 of the License, or (at your option) any later version.
      13             :  *
      14             :  * FFmpeg is distributed in the hope that it will be useful,
      15             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17             :  * Lesser General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU Lesser General Public
      20             :  * License along with FFmpeg; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : /**
      25             :  * @file
      26             :  * floating-point AC-3 encoder.
      27             :  */
      28             : 
      29             : #define CONFIG_AC3ENC_FLOAT 1
      30             : #include "internal.h"
      31             : #include "audiodsp.h"
      32             : #include "ac3enc.h"
      33             : #include "eac3enc.h"
      34             : #include "kbdwin.h"
      35             : 
      36             : 
      37             : #define AC3ENC_TYPE AC3ENC_TYPE_AC3
      38             : #include "ac3enc_opts_template.c"
      39             : static const AVClass ac3enc_class = {
      40             :     .class_name = "AC-3 Encoder",
      41             :     .item_name  = av_default_item_name,
      42             :     .option     = ac3_options,
      43             :     .version    = LIBAVUTIL_VERSION_INT,
      44             : };
      45             : 
      46             : #include "ac3enc_template.c"
      47             : 
      48             : 
      49             : /**
      50             :  * Finalize MDCT and free allocated memory.
      51             :  *
      52             :  * @param s  AC-3 encoder private context
      53             :  */
      54           2 : av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
      55             : {
      56           2 :     ff_mdct_end(&s->mdct);
      57           2 :     av_freep(&s->mdct_window);
      58           2 : }
      59             : 
      60             : 
      61             : /**
      62             :  * Initialize MDCT tables.
      63             :  *
      64             :  * @param s  AC-3 encoder private context
      65             :  * @return   0 on success, negative error code on failure
      66             :  */
      67           2 : av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
      68             : {
      69             :     float *window;
      70             :     int i, n, n2;
      71             : 
      72           2 :     n  = 1 << 9;
      73           2 :     n2 = n >> 1;
      74             : 
      75           2 :     window = av_malloc_array(n, sizeof(*window));
      76           2 :     if (!window) {
      77           0 :         av_log(s->avctx, AV_LOG_ERROR, "Cannot allocate memory.\n");
      78           0 :         return AVERROR(ENOMEM);
      79             :     }
      80           2 :     ff_kbd_window_init(window, 5.0, n2);
      81         514 :     for (i = 0; i < n2; i++)
      82         512 :         window[n-1-i] = window[i];
      83           2 :     s->mdct_window = window;
      84             : 
      85           2 :     return ff_mdct_init(&s->mdct, 9, 0, -2.0 / n);
      86             : }
      87             : 
      88             : 
      89             : /*
      90             :  * Normalize the input samples.
      91             :  * Not needed for the floating-point encoder.
      92             :  */
      93           0 : static int normalize_samples(AC3EncodeContext *s)
      94             : {
      95           0 :     return 0;
      96             : }
      97             : 
      98             : 
      99             : /*
     100             :  * Scale MDCT coefficients from float to 24-bit fixed-point.
     101             :  */
     102         546 : static void scale_coefficients(AC3EncodeContext *s)
     103             : {
     104         546 :     int chan_size = AC3_MAX_COEFS * s->num_blocks;
     105         546 :     int cpl       = s->cpl_on;
     106        1638 :     s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + (chan_size * !cpl),
     107         546 :                                s->mdct_coef_buffer  + (chan_size * !cpl),
     108         546 :                                chan_size * (s->channels + cpl));
     109         546 : }
     110             : 
     111       13104 : static void sum_square_butterfly(AC3EncodeContext *s, float sum[4],
     112             :                                  const float *coef0, const float *coef1,
     113             :                                  int len)
     114             : {
     115       13104 :     s->ac3dsp.sum_square_butterfly_float(sum, coef0, coef1, len);
     116       13104 : }
     117             : 
     118             : /*
     119             :  * Clip MDCT coefficients to allowable range.
     120             :  */
     121        3822 : static void clip_coefficients(AudioDSPContext *adsp, float *coef,
     122             :                               unsigned int len)
     123             : {
     124        3822 :     adsp->vector_clipf(coef, coef, COEF_MIN, COEF_MAX, len);
     125        3822 : }
     126             : 
     127             : 
     128             : /*
     129             :  * Calculate a single coupling coordinate.
     130             :  */
     131       30736 : static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
     132             : {
     133       30736 :     float coord = 0.125;
     134       30736 :     if (energy_cpl > 0)
     135       30736 :         coord *= sqrtf(energy_ch / energy_cpl);
     136       30736 :     return FFMIN(coord, COEF_MAX);
     137             : }
     138             : 
     139           2 : av_cold int ff_ac3_float_encode_init(AVCodecContext *avctx)
     140             : {
     141           2 :     AC3EncodeContext *s = avctx->priv_data;
     142           2 :     s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
     143           2 :     if (!s->fdsp)
     144           0 :         return AVERROR(ENOMEM);
     145           2 :     return ff_ac3_encode_init(avctx);
     146             : }
     147             : 
     148             : AVCodec ff_ac3_encoder = {
     149             :     .name            = "ac3",
     150             :     .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     151             :     .type            = AVMEDIA_TYPE_AUDIO,
     152             :     .id              = AV_CODEC_ID_AC3,
     153             :     .priv_data_size  = sizeof(AC3EncodeContext),
     154             :     .init            = ff_ac3_float_encode_init,
     155             :     .encode2         = ff_ac3_float_encode_frame,
     156             :     .close           = ff_ac3_encode_close,
     157             :     .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
     158             :                                                       AV_SAMPLE_FMT_NONE },
     159             :     .priv_class      = &ac3enc_class,
     160             :     .channel_layouts = ff_ac3_channel_layouts,
     161             :     .defaults        = ac3_defaults,
     162             : };

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