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af_ashowinfo.c
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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 for showing textual audio frame information
24  */
25 
26 #include <inttypes.h>
27 #include <stddef.h>
28 
29 #include "libavutil/adler32.h"
30 #include "libavutil/attributes.h"
32 #include "libavutil/common.h"
33 #include "libavutil/mem.h"
34 #include "libavutil/timestamp.h"
35 #include "libavutil/samplefmt.h"
36 
37 #include "audio.h"
38 #include "avfilter.h"
39 #include "internal.h"
40 
41 typedef struct AShowInfoContext {
42  /**
43  * Scratch space for individual plane checksums for planar audio
44  */
45  uint32_t *plane_checksums;
47 
48 static av_cold void uninit(AVFilterContext *ctx)
49 {
50  AShowInfoContext *s = ctx->priv;
52 }
53 
54 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
55 {
56  AVFilterContext *ctx = inlink->dst;
57  AShowInfoContext *s = ctx->priv;
58  char chlayout_str[128];
59  uint32_t checksum = 0;
61  int planar = av_sample_fmt_is_planar(buf->format);
62  int block_align = av_get_bytes_per_sample(buf->format) * (planar ? 1 : channels);
63  int data_size = buf->nb_samples * block_align;
64  int planes = planar ? channels : 1;
65  int i;
66  void *tmp_ptr = av_realloc(s->plane_checksums, channels * sizeof(*s->plane_checksums));
67 
68  if (!tmp_ptr)
69  return AVERROR(ENOMEM);
70  s->plane_checksums = tmp_ptr;
71 
72  for (i = 0; i < planes; i++) {
73  uint8_t *data = buf->extended_data[i];
74 
75  s->plane_checksums[i] = av_adler32_update(0, data, data_size);
76  checksum = i ? av_adler32_update(checksum, data, data_size) :
77  s->plane_checksums[0];
78  }
79 
80  av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), -1,
81  buf->channel_layout);
82 
83  av_log(ctx, AV_LOG_INFO,
84  "n:%"PRId64" pts:%s pts_time:%s pos:%"PRId64" "
85  "fmt:%s channels:%d chlayout:%s rate:%d nb_samples:%d "
86  "checksum:%08X ",
87  inlink->frame_count,
88  av_ts2str(buf->pts), av_ts2timestr(buf->pts, &inlink->time_base),
90  av_get_sample_fmt_name(buf->format), av_frame_get_channels(buf), chlayout_str,
91  buf->sample_rate, buf->nb_samples,
92  checksum);
93 
94  av_log(ctx, AV_LOG_INFO, "plane_checksums: [ ");
95  for (i = 0; i < planes; i++)
96  av_log(ctx, AV_LOG_INFO, "%08X ", s->plane_checksums[i]);
97  av_log(ctx, AV_LOG_INFO, "]\n");
98 
99  return ff_filter_frame(inlink->dst->outputs[0], buf);
100 }
101 
102 static const AVFilterPad inputs[] = {
103  {
104  .name = "default",
105  .type = AVMEDIA_TYPE_AUDIO,
106  .get_audio_buffer = ff_null_get_audio_buffer,
107  .filter_frame = filter_frame,
108  },
109  { NULL },
110 };
111 
112 static const AVFilterPad outputs[] = {
113  {
114  .name = "default",
115  .type = AVMEDIA_TYPE_AUDIO,
116  },
117  { NULL },
118 };
119 
121  .name = "ashowinfo",
122  .description = NULL_IF_CONFIG_SMALL("Show textual information for each audio frame."),
123  .priv_size = sizeof(AShowInfoContext),
124  .uninit = uninit,
125  .inputs = inputs,
126  .outputs = outputs,
127 };