FFmpeg: libavfilter/vf_showpalette.c Source File

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libavfilter

vf_showpalette.c

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1 /*

2 * This file is part of FFmpeg.

3 *

4 * FFmpeg is free software; you can redistribute it and/or

5 * modify it under the terms of the GNU Lesser General Public

6 * License as published by the Free Software Foundation; either

7 * version 2.1 of the License, or (at your option) any later version.

8 *

9 * FFmpeg is distributed in the hope that it will be useful,

10 * but WITHOUT ANY WARRANTY; without even the implied warranty of

11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

12 * Lesser General Public License for more details.

13 *

14 * You should have received a copy of the GNU Lesser General Public

15 * License along with FFmpeg; if not, write to the Free Software

16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

17 */

19 /**

20 * @file

21 * Display frame palette (AV_PIX_FMT_PAL8)

22 */

24 #include "libavutil/avassert.h"

25 #include "libavutil/opt.h"

26 #include "avfilter.h"

27 #include "formats.h"

28 #include "internal.h"

29 #include "video.h"

31 typedef struct {

32 const AVClass *class;

33 int size;

34 } ShowPaletteContext;

36 #define OFFSET(x) offsetof(ShowPaletteContext, x)

37 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

38 static const AVOption showpalette_options[] = {

39 { "s", "set pixel box size", OFFSET(size), AV_OPT_TYPE_INT, {.i64=30}, 1, 100, FLAGS },

40 { NULL }

41 };

43 AVFILTER_DEFINE_CLASS(showpalette);

45 static int query_formats(AVFilterContext *ctx)

46 {

47 static const enum AVPixelFormat in_fmts[] = {AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE};

48 static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};

49 AVFilterFormats *in = ff_make_format_list(in_fmts);

50 AVFilterFormats *out = ff_make_format_list(out_fmts);

51 if (!in || !out) {

52 av_freep(&in);

53 av_freep(&out);

54 return AVERROR(ENOMEM);

55 }

56 ff_formats_ref(in, &ctx->inputs[0]->out_formats);

57 ff_formats_ref(out, &ctx->outputs[0]->in_formats);

58 return 0;

59 }

61 static int config_output(AVFilterLink *outlink)

62 {

63 AVFilterContext *ctx = outlink->src;

64 const ShowPaletteContext *s = ctx->priv;

65 outlink->w = outlink->h = 16 * s->size;

66 return 0;

67 }

69 static int disp_palette(AVFrame *out, const AVFrame *in, int size)

70 {

71 int x, y, i, j;

72 uint32_t *dst = (uint32_t *)out->data[0];

73 const int dst_linesize = out->linesize[0] >> 2;

74 const uint32_t *pal = (uint32_t *)in->data[1];

76 for (y = 0; y < 16; y++)

77 for (x = 0; x < 16; x++)

78 for (j = 0; j < size; j++)

79 for (i = 0; i < size; i++)

80 dst[(y*dst_linesize + x) * size + j*dst_linesize + i] = pal[y*16 + x];

81 return 0;

82 }

84 static int filter_frame(AVFilterLink *inlink, AVFrame *in)

85 {

86 int ret;

87 AVFrame *out;

88 AVFilterContext *ctx = inlink->dst;

89 const ShowPaletteContext *s= ctx->priv;

90 AVFilterLink *outlink = ctx->outputs[0];

92 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

93 if (!out) {

94 av_frame_free(&in);

95 return AVERROR(ENOMEM);

96 }

97 av_frame_copy_props(out, in);

98 ret = disp_palette(out, in, s->size);

99 av_frame_free(&in);

100 return ret < 0 ? ret : ff_filter_frame(outlink, out);

101 }

102

103 static const AVFilterPad showpalette_inputs[] = {

104 {

105 .name = "default",

106 .type = AVMEDIA_TYPE_VIDEO,

107 .filter_frame = filter_frame,

108 },

109 { NULL }

110 };

111

112 static const AVFilterPad showpalette_outputs[] = {

113 {

114 .name = "default",

115 .type = AVMEDIA_TYPE_VIDEO,

116 .config_props = config_output,

117 },

118 { NULL }

119 };

120

121 AVFilter ff_vf_showpalette = {

122 .name = "showpalette",

123 .description = NULL_IF_CONFIG_SMALL("Display frame palette"),

124 .priv_size = sizeof(ShowPaletteContext),

125 .query_formats = query_formats,

126 .inputs = showpalette_inputs,

127 .outputs = showpalette_outputs,

128 .priv_class = &showpalette_class,

129 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

130 };

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