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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"
31 #include "libavutil/common.h"
32 #include "libavutil/mem.h"
33 #include "libavutil/timestamp.h"
34 #include "libavutil/samplefmt.h"
35 
36 #include "audio.h"
37 #include "avfilter.h"
38 #include "internal.h"
39 
40 typedef struct AShowInfoContext {
41  /**
42  * Scratch space for individual plane checksums for planar audio
43  */
44  uint32_t *plane_checksums;
45 
46  /**
47  * Frame counter
48  */
49  uint64_t frame;
51 
52 static void uninit(AVFilterContext *ctx)
53 {
54  AShowInfoContext *s = ctx->priv;
56 }
57 
58 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
59 {
60  AVFilterContext *ctx = inlink->dst;
61  AShowInfoContext *s = ctx->priv;
62  char chlayout_str[128];
63  uint32_t checksum = 0;
65  int planar = av_sample_fmt_is_planar(buf->format);
66  int block_align = av_get_bytes_per_sample(buf->format) * (planar ? 1 : channels);
67  int data_size = buf->audio->nb_samples * block_align;
68  int planes = planar ? channels : 1;
69  int i;
70  void *tmp_ptr = av_realloc(s->plane_checksums, channels * sizeof(*s->plane_checksums));
71 
72  if (!tmp_ptr)
73  return AVERROR(ENOMEM);
74  s->plane_checksums = tmp_ptr;
75 
76  for (i = 0; i < planes; i++) {
77  uint8_t *data = buf->extended_data[i];
78 
79  s->plane_checksums[i] = av_adler32_update(0, data, data_size);
80  checksum = i ? av_adler32_update(checksum, data, data_size) :
81  s->plane_checksums[0];
82  }
83 
84  av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), -1,
85  buf->audio->channel_layout);
86 
87  av_log(ctx, AV_LOG_INFO,
88  "n:%"PRIu64" pts:%s pts_time:%s pos:%"PRId64" "
89  "fmt:%s channels:%d chlayout:%s rate:%d nb_samples:%d "
90  "checksum:%08X ",
91  s->frame,
92  av_ts2str(buf->pts), av_ts2timestr(buf->pts, &inlink->time_base),
93  buf->pos,
94  av_get_sample_fmt_name(buf->format), buf->audio->channels, chlayout_str,
95  buf->audio->sample_rate, buf->audio->nb_samples,
96  checksum);
97 
98  av_log(ctx, AV_LOG_INFO, "plane_checksums: [ ");
99  for (i = 0; i < planes; i++)
100  av_log(ctx, AV_LOG_INFO, "%08X ", s->plane_checksums[i]);
101  av_log(ctx, AV_LOG_INFO, "]\n");
102 
103  s->frame++;
104  return ff_filter_frame(inlink->dst->outputs[0], buf);
105 }
106 
107 static const AVFilterPad inputs[] = {
108  {
109  .name = "default",
110  .type = AVMEDIA_TYPE_AUDIO,
111  .get_audio_buffer = ff_null_get_audio_buffer,
112  .filter_frame = filter_frame,
113  .min_perms = AV_PERM_READ,
114  },
115  { NULL },
116 };
117 
118 static const AVFilterPad outputs[] = {
119  {
120  .name = "default",
121  .type = AVMEDIA_TYPE_AUDIO,
122  },
123  { NULL },
124 };
125 
127  .name = "ashowinfo",
128  .description = NULL_IF_CONFIG_SMALL("Show textual information for each audio frame."),
129  .priv_size = sizeof(AShowInfoContext),
130  .uninit = uninit,
131  .inputs = inputs,
132  .outputs = outputs,
133 };