LCOV - code coverage report
Current view: top level - src/libavfilter - af_asetnsamples.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 61 68 89.7 %
Date: 2017-08-17 10:06:07 Functions: 6 6 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012 Andrey Utkin
       3             :  * Copyright (c) 2012 Stefano Sabatini
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * Filter that changes number of samples on single output operation
      25             :  */
      26             : 
      27             : #include "libavutil/audio_fifo.h"
      28             : #include "libavutil/avassert.h"
      29             : #include "libavutil/channel_layout.h"
      30             : #include "libavutil/opt.h"
      31             : #include "avfilter.h"
      32             : #include "audio.h"
      33             : #include "internal.h"
      34             : #include "formats.h"
      35             : 
      36             : typedef struct ASNSContext {
      37             :     const AVClass *class;
      38             :     int nb_out_samples;  ///< how many samples to output
      39             :     AVAudioFifo *fifo;   ///< samples are queued here
      40             :     int64_t next_out_pts;
      41             :     int pad;
      42             : } ASNSContext;
      43             : 
      44             : #define OFFSET(x) offsetof(ASNSContext, x)
      45             : #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
      46             : 
      47             : static const AVOption asetnsamples_options[] = {
      48             :     { "nb_out_samples", "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
      49             :     { "n",              "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
      50             :     { "pad", "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
      51             :     { "p",   "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
      52             :     { NULL }
      53             : };
      54             : 
      55             : AVFILTER_DEFINE_CLASS(asetnsamples);
      56             : 
      57           1 : static av_cold int init(AVFilterContext *ctx)
      58             : {
      59           1 :     ASNSContext *asns = ctx->priv;
      60             : 
      61           1 :     asns->next_out_pts = AV_NOPTS_VALUE;
      62           1 :     av_log(ctx, AV_LOG_VERBOSE, "nb_out_samples:%d pad:%d\n", asns->nb_out_samples, asns->pad);
      63             : 
      64           1 :     return 0;
      65             : }
      66             : 
      67           1 : static av_cold void uninit(AVFilterContext *ctx)
      68             : {
      69           1 :     ASNSContext *asns = ctx->priv;
      70           1 :     av_audio_fifo_free(asns->fifo);
      71           1 : }
      72             : 
      73           1 : static int config_props_output(AVFilterLink *outlink)
      74             : {
      75           1 :     ASNSContext *asns = outlink->src->priv;
      76             : 
      77           1 :     asns->fifo = av_audio_fifo_alloc(outlink->format, outlink->channels, asns->nb_out_samples);
      78           1 :     if (!asns->fifo)
      79           0 :         return AVERROR(ENOMEM);
      80             : 
      81           1 :     return 0;
      82             : }
      83             : 
      84         518 : static int push_samples(AVFilterLink *outlink)
      85             : {
      86         518 :     ASNSContext *asns = outlink->src->priv;
      87         518 :     AVFrame *outsamples = NULL;
      88             :     int ret, nb_out_samples, nb_pad_samples;
      89             : 
      90         518 :     if (asns->pad) {
      91         518 :         nb_out_samples = av_audio_fifo_size(asns->fifo) ? asns->nb_out_samples : 0;
      92         518 :         nb_pad_samples = nb_out_samples - FFMIN(nb_out_samples, av_audio_fifo_size(asns->fifo));
      93             :     } else {
      94           0 :         nb_out_samples = FFMIN(asns->nb_out_samples, av_audio_fifo_size(asns->fifo));
      95           0 :         nb_pad_samples = 0;
      96             :     }
      97             : 
      98         518 :     if (!nb_out_samples)
      99           1 :         return 0;
     100             : 
     101         517 :     outsamples = ff_get_audio_buffer(outlink, nb_out_samples);
     102         517 :     if (!outsamples)
     103           0 :         return AVERROR(ENOMEM);
     104             : 
     105         517 :     av_audio_fifo_read(asns->fifo,
     106         517 :                        (void **)outsamples->extended_data, nb_out_samples);
     107             : 
     108         517 :     if (nb_pad_samples)
     109           1 :         av_samples_set_silence(outsamples->extended_data, nb_out_samples - nb_pad_samples,
     110             :                                nb_pad_samples, outlink->channels,
     111           1 :                                outlink->format);
     112         517 :     outsamples->nb_samples     = nb_out_samples;
     113         517 :     outsamples->channel_layout = outlink->channel_layout;
     114         517 :     outsamples->sample_rate    = outlink->sample_rate;
     115         517 :     outsamples->pts = asns->next_out_pts;
     116             : 
     117         517 :     if (asns->next_out_pts != AV_NOPTS_VALUE)
     118         517 :         asns->next_out_pts += av_rescale_q(nb_out_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
     119             : 
     120         517 :     ret = ff_filter_frame(outlink, outsamples);
     121         517 :     if (ret < 0)
     122           0 :         return ret;
     123         517 :     return nb_out_samples;
     124             : }
     125             : 
     126         259 : static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
     127             : {
     128         259 :     AVFilterContext *ctx = inlink->dst;
     129         259 :     ASNSContext *asns = ctx->priv;
     130         259 :     AVFilterLink *outlink = ctx->outputs[0];
     131             :     int ret;
     132         259 :     int nb_samples = insamples->nb_samples;
     133             : 
     134         259 :     if (av_audio_fifo_space(asns->fifo) < nb_samples) {
     135           1 :         av_log(ctx, AV_LOG_DEBUG, "No space for %d samples, stretching audio fifo\n", nb_samples);
     136           1 :         ret = av_audio_fifo_realloc(asns->fifo, av_audio_fifo_size(asns->fifo) + nb_samples);
     137           1 :         if (ret < 0) {
     138           0 :             av_log(ctx, AV_LOG_ERROR,
     139             :                    "Stretching audio fifo failed, discarded %d samples\n", nb_samples);
     140           0 :             return -1;
     141             :         }
     142             :     }
     143         259 :     av_audio_fifo_write(asns->fifo, (void **)insamples->extended_data, nb_samples);
     144         259 :     if (asns->next_out_pts == AV_NOPTS_VALUE)
     145           1 :         asns->next_out_pts = insamples->pts;
     146         259 :     av_frame_free(&insamples);
     147             : 
     148        1034 :     while (av_audio_fifo_size(asns->fifo) >= asns->nb_out_samples)
     149         516 :         push_samples(outlink);
     150         259 :     return 0;
     151             : }
     152             : 
     153         261 : static int request_frame(AVFilterLink *outlink)
     154             : {
     155         261 :     AVFilterLink *inlink = outlink->src->inputs[0];
     156             :     int ret;
     157             : 
     158         261 :     ret = ff_request_frame(inlink);
     159         261 :     if (ret == AVERROR_EOF) {
     160           2 :         ret = push_samples(outlink);
     161           2 :         return ret < 0 ? ret : ret > 0 ? 0 : AVERROR_EOF;
     162             :     }
     163             : 
     164         259 :     return ret;
     165             : }
     166             : 
     167             : static const AVFilterPad asetnsamples_inputs[] = {
     168             :     {
     169             :         .name         = "default",
     170             :         .type         = AVMEDIA_TYPE_AUDIO,
     171             :         .filter_frame = filter_frame,
     172             :     },
     173             :     { NULL }
     174             : };
     175             : 
     176             : static const AVFilterPad asetnsamples_outputs[] = {
     177             :     {
     178             :         .name          = "default",
     179             :         .type          = AVMEDIA_TYPE_AUDIO,
     180             :         .request_frame = request_frame,
     181             :         .config_props  = config_props_output,
     182             :     },
     183             :     { NULL }
     184             : };
     185             : 
     186             : AVFilter ff_af_asetnsamples = {
     187             :     .name        = "asetnsamples",
     188             :     .description = NULL_IF_CONFIG_SMALL("Set the number of samples for each output audio frames."),
     189             :     .priv_size   = sizeof(ASNSContext),
     190             :     .priv_class  = &asetnsamples_class,
     191             :     .init        = init,
     192             :     .uninit      = uninit,
     193             :     .inputs      = asetnsamples_inputs,
     194             :     .outputs     = asetnsamples_outputs,
     195             : };

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