libavfilter/af_ashowinfo.c

   1 /*
   2  * Copyright (c) 2011 Stefano Sabatini
   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  * filter fow showing textual audio frame information
  24  */
  25
  26 #include "libavutil/adler32.h"
  27 #include "libavutil/audioconvert.h"
  28 #include "avfilter.h"
  29
  30 typedef struct {
  31     unsigned int frame;
  32 } ShowInfoContext;
  33
  34 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
  35 {
  36     ShowInfoContext *showinfo = ctx->priv;
  37     showinfo->frame = 0;
  38     return 0;
  39 }
  40
  41 static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
  42 {
  43     AVFilterContext *ctx = inlink->dst;
  44     ShowInfoContext *showinfo = ctx->priv;
  45     uint32_t plane_checksum[8] = {0}, checksum = 0;
  46     char chlayout_str[128];
  47     int plane;
  48
  49     for (plane = 0; samplesref->data[plane] && plane < 8; plane++) {
  50         uint8_t *data = samplesref->data[plane];
  51         int linesize = samplesref->linesize[plane];
  52
  53         plane_checksum[plane] = av_adler32_update(plane_checksum[plane],
  54                                                   data, linesize);
  55         checksum = av_adler32_update(checksum, data, linesize);
  56     }
  57
  58     av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), -1,
  59                                  samplesref->audio->channel_layout);
  60
  61     av_log(ctx, AV_LOG_INFO,
  62            "n:%d pts:%"PRId64" pts_time:%f pos:%"PRId64" "
  63            "fmt:%s chlayout:%s nb_samples:%d rate:%d planar:%d "
  64            "checksum:%u plane_checksum[%u %u %u %u %u %u %u %u]\n",
  65            showinfo->frame,
  66            samplesref->pts, samplesref->pts * av_q2d(inlink->time_base),
  67            samplesref->pos,
  68            av_get_sample_fmt_name(samplesref->format),
  69            chlayout_str,
  70            samplesref->audio->nb_samples,
  71            samplesref->audio->sample_rate,
  72            samplesref->audio->planar,
  73            checksum,
  74            plane_checksum[0], plane_checksum[1], plane_checksum[2], plane_checksum[3],
  75            plane_checksum[4], plane_checksum[5], plane_checksum[6], plane_checksum[7]);
  76
  77     showinfo->frame++;
  78
  79     avfilter_filter_samples(inlink->dst->outputs[0], samplesref);
  80 }
  81
  82 AVFilter avfilter_af_ashowinfo = {
  83     .name        = "ashowinfo",
  84     .description = NULL_IF_CONFIG_SMALL("Show textual information for each audio frame."),
  85
  86     .priv_size = sizeof(ShowInfoContext),
  87     .init      = init,
  88
  89     .inputs    = (AVFilterPad[]) {{ .name = "default",
  90                                     .type             = AVMEDIA_TYPE_AUDIO,
  91                                     .get_audio_buffer = avfilter_null_get_audio_buffer,
  92                                     .filter_samples   = filter_samples,
  93                                     .min_perms        = AV_PERM_READ, },
  94                                   { .name = NULL}},
  95
  96     .outputs   = (AVFilterPad[]) {{ .name             = "default",
  97                                     .type             = AVMEDIA_TYPE_AUDIO },
  98                                   { .name = NULL}},
  99 };