LCOV - code coverage report
Current view: top level - src/libavfilter - af_apad.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 37 43 86.0 %
Date: 2017-08-17 10:06:07 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012 Michael Niedermayer
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * audio pad filter.
      24             :  *
      25             :  * Based on af_aresample.c
      26             :  */
      27             : 
      28             : #include "libavutil/avstring.h"
      29             : #include "libavutil/channel_layout.h"
      30             : #include "libavutil/opt.h"
      31             : #include "libavutil/samplefmt.h"
      32             : #include "libavutil/avassert.h"
      33             : #include "avfilter.h"
      34             : #include "audio.h"
      35             : #include "internal.h"
      36             : 
      37             : typedef struct APadContext {
      38             :     const AVClass *class;
      39             :     int64_t next_pts;
      40             : 
      41             :     int packet_size;
      42             :     int64_t pad_len, pad_len_left;
      43             :     int64_t whole_len, whole_len_left;
      44             : } APadContext;
      45             : 
      46             : #define OFFSET(x) offsetof(APadContext, x)
      47             : #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
      48             : 
      49             : static const AVOption apad_options[] = {
      50             :     { "packet_size", "set silence packet size",                                  OFFSET(packet_size), AV_OPT_TYPE_INT,   { .i64 = 4096 }, 0, INT_MAX, A },
      51             :     { "pad_len",     "set number of samples of silence to add",                  OFFSET(pad_len),     AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, A },
      52             :     { "whole_len",   "set minimum target number of samples in the audio stream", OFFSET(whole_len),   AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, A },
      53             :     { NULL }
      54             : };
      55             : 
      56             : AVFILTER_DEFINE_CLASS(apad);
      57             : 
      58           1 : static av_cold int init(AVFilterContext *ctx)
      59             : {
      60           1 :     APadContext *s = ctx->priv;
      61             : 
      62           1 :     s->next_pts = AV_NOPTS_VALUE;
      63           1 :     if (s->whole_len >= 0 && s->pad_len >= 0) {
      64           0 :         av_log(ctx, AV_LOG_ERROR, "Both whole and pad length are set, this is not possible\n");
      65           0 :         return AVERROR(EINVAL);
      66             :     }
      67           1 :     s->pad_len_left   = s->pad_len;
      68           1 :     s->whole_len_left = s->whole_len;
      69             : 
      70           1 :     return 0;
      71             : }
      72             : 
      73         259 : static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
      74             : {
      75         259 :     AVFilterContext *ctx = inlink->dst;
      76         259 :     APadContext *s = ctx->priv;
      77             : 
      78         259 :     if (s->whole_len >= 0) {
      79           0 :         s->whole_len_left = FFMAX(s->whole_len_left - frame->nb_samples, 0);
      80           0 :         av_log(ctx, AV_LOG_DEBUG,
      81             :                "n_out:%d whole_len_left:%"PRId64"\n", frame->nb_samples, s->whole_len_left);
      82             :     }
      83             : 
      84         259 :     s->next_pts = frame->pts + av_rescale_q(frame->nb_samples, (AVRational){1, inlink->sample_rate}, inlink->time_base);
      85         259 :     return ff_filter_frame(ctx->outputs[0], frame);
      86             : }
      87             : 
      88         261 : static int request_frame(AVFilterLink *outlink)
      89             : {
      90         261 :     AVFilterContext *ctx = outlink->src;
      91         261 :     APadContext *s = ctx->priv;
      92             :     int ret;
      93             : 
      94         261 :     ret = ff_request_frame(ctx->inputs[0]);
      95             : 
      96         261 :     if (ret == AVERROR_EOF && !ctx->is_disabled) {
      97           2 :         int n_out = s->packet_size;
      98             :         AVFrame *outsamplesref;
      99             : 
     100           2 :         if (s->whole_len >= 0 && s->pad_len < 0) {
     101           0 :             s->pad_len = s->pad_len_left = s->whole_len_left;
     102             :         }
     103           2 :         if (s->pad_len >=0 || s->whole_len >= 0) {
     104           2 :             n_out = FFMIN(n_out, s->pad_len_left);
     105           2 :             s->pad_len_left -= n_out;
     106           2 :             av_log(ctx, AV_LOG_DEBUG,
     107             :                    "padding n_out:%d pad_len_left:%"PRId64"\n", n_out, s->pad_len_left);
     108             :         }
     109             : 
     110           2 :         if (!n_out)
     111           1 :             return AVERROR_EOF;
     112             : 
     113           1 :         outsamplesref = ff_get_audio_buffer(outlink, n_out);
     114           1 :         if (!outsamplesref)
     115           0 :             return AVERROR(ENOMEM);
     116             : 
     117           1 :         av_assert0(outsamplesref->sample_rate == outlink->sample_rate);
     118           1 :         av_assert0(outsamplesref->nb_samples  == n_out);
     119             : 
     120           1 :         av_samples_set_silence(outsamplesref->extended_data, 0,
     121             :                                n_out,
     122             :                                outsamplesref->channels,
     123           1 :                                outsamplesref->format);
     124             : 
     125           1 :         outsamplesref->pts = s->next_pts;
     126           1 :         if (s->next_pts != AV_NOPTS_VALUE)
     127           1 :             s->next_pts += av_rescale_q(n_out, (AVRational){1, outlink->sample_rate}, outlink->time_base);
     128             : 
     129           1 :         return ff_filter_frame(outlink, outsamplesref);
     130             :     }
     131         259 :     return ret;
     132             : }
     133             : 
     134             : static const AVFilterPad apad_inputs[] = {
     135             :     {
     136             :         .name         = "default",
     137             :         .type         = AVMEDIA_TYPE_AUDIO,
     138             :         .filter_frame = filter_frame,
     139             :     },
     140             :     { NULL }
     141             : };
     142             : 
     143             : static const AVFilterPad apad_outputs[] = {
     144             :     {
     145             :         .name          = "default",
     146             :         .request_frame = request_frame,
     147             :         .type          = AVMEDIA_TYPE_AUDIO,
     148             :     },
     149             :     { NULL }
     150             : };
     151             : 
     152             : AVFilter ff_af_apad = {
     153             :     .name          = "apad",
     154             :     .description   = NULL_IF_CONFIG_SMALL("Pad audio with silence."),
     155             :     .init          = init,
     156             :     .priv_size     = sizeof(APadContext),
     157             :     .inputs        = apad_inputs,
     158             :     .outputs       = apad_outputs,
     159             :     .priv_class    = &apad_class,
     160             :     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
     161             : };

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