FFmpeg: libavfilter/af_ashowinfo.c Source File

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libavfilter

af_ashowinfo.c

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1 /*

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 */

21 /**

22 * @file

23 * filter for showing textual audio frame information

24 */

26 #include <inttypes.h>

27 #include <stddef.h>

29 #include "libavutil/adler32.h"

30 #include "libavutil/attributes.h"

31 #include "libavutil/channel_layout.h"

32 #include "libavutil/common.h"

33 #include "libavutil/mem.h"

34 #include "libavutil/timestamp.h"

35 #include "libavutil/samplefmt.h"

37 #include "audio.h"

38 #include "avfilter.h"

39 #include "internal.h"

41 typedef struct AShowInfoContext {

42 /**

43 * Scratch space for individual plane checksums for planar audio

44 */

45 uint32_t *plane_checksums;

46 } AShowInfoContext;

48 static av_cold void uninit(AVFilterContext *ctx)

49 {

50 AShowInfoContext *s = ctx->priv;

51 av_freep(&s->plane_checksums);

52 }

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;

60 int channels = av_get_channel_layout_nb_channels(buf->channel_layout);

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));

68 if (!tmp_ptr)

69 return AVERROR(ENOMEM);

70 s->plane_checksums = tmp_ptr;

72 for (i = 0; i < planes; i++) {

73 uint8_t *data = buf->extended_data[i];

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 }

80 av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), -1,

81 buf->channel_layout);

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),

89 av_frame_get_pkt_pos(buf),

90 av_get_sample_fmt_name(buf->format), av_frame_get_channels(buf), chlayout_str,

91 buf->sample_rate, buf->nb_samples,

92 checksum);

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");

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

120 AVFilter avfilter_af_ashowinfo = {

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 };

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