LCOV - code coverage report
Current view: top level - src/libavcodec - ac3enc_float.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 37 40 92.5 %
Date: 2017-05-26 21:11:57 Functions: 7 7 100.0 %

          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             : 
      47             : /*
      48             :  * Scale MDCT coefficients from float to 24-bit fixed-point.
      49             :  */
      50         546 : static void scale_coefficients(AC3EncodeContext *s)
      51             : {
      52         546 :     int chan_size = AC3_MAX_COEFS * s->num_blocks;
      53         546 :     int cpl       = s->cpl_on;
      54        1638 :     s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + (chan_size * !cpl),
      55         546 :                                s->mdct_coef_buffer  + (chan_size * !cpl),
      56         546 :                                chan_size * (s->channels + cpl));
      57         546 : }
      58             : 
      59             : 
      60             : /*
      61             :  * Clip MDCT coefficients to allowable range.
      62             :  */
      63        3822 : static void clip_coefficients(AudioDSPContext *adsp, float *coef,
      64             :                               unsigned int len)
      65             : {
      66        3822 :     adsp->vector_clipf(coef, coef, len, COEF_MIN, COEF_MAX);
      67        3822 : }
      68             : 
      69             : 
      70             : /*
      71             :  * Calculate a single coupling coordinate.
      72             :  */
      73       30736 : static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
      74             : {
      75       30736 :     float coord = 0.125;
      76       30736 :     if (energy_cpl > 0)
      77       30736 :         coord *= sqrtf(energy_ch / energy_cpl);
      78       30736 :     return FFMIN(coord, COEF_MAX);
      79             : }
      80             : 
      81       13104 : static void sum_square_butterfly(AC3EncodeContext *s, float sum[4],
      82             :                                  const float *coef0, const float *coef1,
      83             :                                  int len)
      84             : {
      85       13104 :     s->ac3dsp.sum_square_butterfly_float(sum, coef0, coef1, len);
      86       13104 : }
      87             : 
      88             : 
      89             : #include "ac3enc_template.c"
      90             : 
      91             : 
      92             : /**
      93             :  * Finalize MDCT and free allocated memory.
      94             :  *
      95             :  * @param s  AC-3 encoder private context
      96             :  */
      97           2 : av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
      98             : {
      99           2 :     ff_mdct_end(&s->mdct);
     100           2 :     av_freep(&s->mdct_window);
     101           2 : }
     102             : 
     103             : 
     104             : /**
     105             :  * Initialize MDCT tables.
     106             :  *
     107             :  * @param s  AC-3 encoder private context
     108             :  * @return   0 on success, negative error code on failure
     109             :  */
     110           2 : av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
     111             : {
     112             :     float *window;
     113             :     int i, n, n2;
     114             : 
     115           2 :     n  = 1 << 9;
     116           2 :     n2 = n >> 1;
     117             : 
     118           2 :     window = av_malloc_array(n, sizeof(*window));
     119           2 :     if (!window) {
     120           0 :         av_log(s->avctx, AV_LOG_ERROR, "Cannot allocate memory.\n");
     121           0 :         return AVERROR(ENOMEM);
     122             :     }
     123           2 :     ff_kbd_window_init(window, 5.0, n2);
     124         514 :     for (i = 0; i < n2; i++)
     125         512 :         window[n-1-i] = window[i];
     126           2 :     s->mdct_window = window;
     127             : 
     128           2 :     return ff_mdct_init(&s->mdct, 9, 0, -2.0 / n);
     129             : }
     130             : 
     131             : 
     132           2 : av_cold int ff_ac3_float_encode_init(AVCodecContext *avctx)
     133             : {
     134           2 :     AC3EncodeContext *s = avctx->priv_data;
     135           2 :     s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
     136           2 :     if (!s->fdsp)
     137           0 :         return AVERROR(ENOMEM);
     138           2 :     return ff_ac3_encode_init(avctx);
     139             : }
     140             : 
     141             : AVCodec ff_ac3_encoder = {
     142             :     .name            = "ac3",
     143             :     .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     144             :     .type            = AVMEDIA_TYPE_AUDIO,
     145             :     .id              = AV_CODEC_ID_AC3,
     146             :     .priv_data_size  = sizeof(AC3EncodeContext),
     147             :     .init            = ff_ac3_float_encode_init,
     148             :     .encode2         = ff_ac3_float_encode_frame,
     149             :     .close           = ff_ac3_encode_close,
     150             :     .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
     151             :                                                       AV_SAMPLE_FMT_NONE },
     152             :     .priv_class      = &ac3enc_class,
     153             :     .channel_layouts = ff_ac3_channel_layouts,
     154             :     .defaults        = ac3_defaults,
     155             : };

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