af_ashowinfo.c
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1 /*
2  * Copyright (c) 2011 Stefano Sabatini
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
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/samplefmt.h"
34 
35 #include "audio.h"
36 #include "avfilter.h"
37 #include "internal.h"
38 
39 typedef struct AShowInfoContext {
43  uint32_t *plane_checksums;
44 
48  uint64_t frame;
50 
51 static int config_input(AVFilterLink *inlink)
52 {
53  AShowInfoContext *s = inlink->dst->priv;
54  int channels = av_get_channel_layout_nb_channels(inlink->channel_layout);
55  s->plane_checksums = av_malloc(channels * sizeof(*s->plane_checksums));
56  if (!s->plane_checksums)
57  return AVERROR(ENOMEM);
58 
59  return 0;
60 }
61 
62 static void uninit(AVFilterContext *ctx)
63 {
64  AShowInfoContext *s = ctx->priv;
66 }
67 
68 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
69 {
70  AVFilterContext *ctx = inlink->dst;
71  AShowInfoContext *s = ctx->priv;
72  char chlayout_str[128];
73  uint32_t checksum = 0;
75  int planar = av_sample_fmt_is_planar(buf->format);
76  int block_align = av_get_bytes_per_sample(buf->format) * (planar ? 1 : channels);
77  int data_size = buf->audio->nb_samples * block_align;
78  int planes = planar ? channels : 1;
79  int i;
80 
81  for (i = 0; i < planes; i++) {
82  uint8_t *data = buf->extended_data[i];
83 
84  s->plane_checksums[i] = av_adler32_update(0, data, data_size);
85  checksum = i ? av_adler32_update(checksum, data, data_size) :
86  s->plane_checksums[0];
87  }
88 
89  av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), -1,
90  buf->audio->channel_layout);
91 
92  av_log(ctx, AV_LOG_INFO,
93  "n:%"PRIu64" pts:%"PRId64" pts_time:%f "
94  "fmt:%s chlayout:%s rate:%d nb_samples:%d "
95  "checksum:%08X ",
96  s->frame, buf->pts, buf->pts * av_q2d(inlink->time_base),
97  av_get_sample_fmt_name(buf->format), chlayout_str,
98  buf->audio->sample_rate, buf->audio->nb_samples,
99  checksum);
100 
101  av_log(ctx, AV_LOG_INFO, "plane_checksums: [ ");
102  for (i = 0; i < planes; i++)
103  av_log(ctx, AV_LOG_INFO, "%08X ", s->plane_checksums[i]);
104  av_log(ctx, AV_LOG_INFO, "]\n");
105 
106  s->frame++;
107  return ff_filter_frame(inlink->dst->outputs[0], buf);
108 }
109 
110 static const AVFilterPad inputs[] = {
111  {
112  .name = "default",
113  .type = AVMEDIA_TYPE_AUDIO,
114  .get_audio_buffer = ff_null_get_audio_buffer,
115  .config_props = config_input,
116  .filter_frame = filter_frame,
117  .min_perms = AV_PERM_READ,
118  },
119  { NULL },
120 };
121 
122 static const AVFilterPad outputs[] = {
123  {
124  .name = "default",
125  .type = AVMEDIA_TYPE_AUDIO,
126  },
127  { NULL },
128 };
129 
131  .name = "ashowinfo",
132  .description = NULL_IF_CONFIG_SMALL("Show textual information for each audio frame."),
133  .priv_size = sizeof(AShowInfoContext),
134  .uninit = uninit,
135  .inputs = inputs,
136  .outputs = outputs,
137 };