FFmpeg: libavfilter/f_settb.c Source File

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libavfilter

f_settb.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 * Set timebase for the output link.

24 */

26 #include <inttypes.h>

27 #include <stdio.h>

29 #include "libavutil/avstring.h"

30 #include "libavutil/eval.h"

31 #include "libavutil/internal.h"

32 #include "libavutil/mathematics.h"

33 #include "libavutil/opt.h"

34 #include "libavutil/rational.h"

35 #include "avfilter.h"

36 #include "internal.h"

37 #include "audio.h"

38 #include "video.h"

40 static const char *const var_names[] = {

41 "AVTB", /* default timebase 1/AV_TIME_BASE */

42 "intb", /* input timebase */

43 "sr", /* sample rate */

44 NULL

45 };

47 enum var_name {

48 VAR_AVTB,

49 VAR_INTB,

50 VAR_SR,

51 VAR_VARS_NB

52 };

54 typedef struct {

55 const AVClass *class;

56 char *tb_expr;

57 double var_values[VAR_VARS_NB];

58 } SetTBContext;

60 #define OFFSET(x) offsetof(SetTBContext, x)

61 #define DEFINE_OPTIONS(filt_name, filt_type) \

62 static const AVOption filt_name##_options[] = { \

63 { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \

64 .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \

65 { "tb", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \

66 .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \

67 { NULL } \

68 }

70 static int config_output_props(AVFilterLink *outlink)

71 {

72 AVFilterContext *ctx = outlink->src;

73 SetTBContext *settb = ctx->priv;

74 AVFilterLink *inlink = ctx->inputs[0];

75 AVRational time_base;

76 int ret;

77 double res;

79 settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);

80 settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);

81 settb->var_values[VAR_SR] = inlink->sample_rate;

83 outlink->w = inlink->w;

84 outlink->h = inlink->h;

86 if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,

87 NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {

88 av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);

89 return ret;

90 }

91 time_base = av_d2q(res, INT_MAX);

92 if (time_base.num <= 0 || time_base.den <= 0) {

93 av_log(ctx, AV_LOG_ERROR,

94 "Invalid non-positive values for the timebase num:%d or den:%d.\n",

95 time_base.num, time_base.den);

96 return AVERROR(EINVAL);

97 }

99 outlink->time_base = time_base;

100 av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",

101 inlink ->time_base.num, inlink ->time_base.den,

102 outlink->time_base.num, outlink->time_base.den);

103

104 return 0;

105 }

106

107 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

108 {

109 AVFilterContext *ctx = inlink->dst;

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

111

112 if (av_cmp_q(inlink->time_base, outlink->time_base)) {

113 int64_t orig_pts = frame->pts;

114 frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);

115 av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",

116 inlink ->time_base.num, inlink ->time_base.den, orig_pts,

117 outlink->time_base.num, outlink->time_base.den, frame->pts);

118 }

119

120 return ff_filter_frame(outlink, frame);

121 }

122

123 #if CONFIG_SETTB_FILTER

124

125 DEFINE_OPTIONS(settb, VIDEO);

126 AVFILTER_DEFINE_CLASS(settb);

127

128 static const AVFilterPad avfilter_vf_settb_inputs[] = {

129 {

130 .name = "default",

131 .type = AVMEDIA_TYPE_VIDEO,

132 .get_video_buffer = ff_null_get_video_buffer,

133 .filter_frame = filter_frame,

134 },

135 { NULL }

136 };

137

138 static const AVFilterPad avfilter_vf_settb_outputs[] = {

139 {

140 .name = "default",

141 .type = AVMEDIA_TYPE_VIDEO,

142 .config_props = config_output_props,

143 },

144 { NULL }

145 };

146

147 AVFilter avfilter_vf_settb = {

148 .name = "settb",

149 .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),

150

151 .priv_size = sizeof(SetTBContext),

152 .priv_class = &settb_class,

153

154 .inputs = avfilter_vf_settb_inputs,

155 .outputs = avfilter_vf_settb_outputs,

156 };

157 #endif

158

159 #if CONFIG_ASETTB_FILTER

160

161 DEFINE_OPTIONS(asettb, AUDIO);

162 AVFILTER_DEFINE_CLASS(asettb);

163

164 static const AVFilterPad avfilter_af_asettb_inputs[] = {

165 {

166 .name = "default",

167 .type = AVMEDIA_TYPE_AUDIO,

168 .get_audio_buffer = ff_null_get_audio_buffer,

169 .filter_frame = filter_frame,

170 },

171 { NULL }

172 };

173

174 static const AVFilterPad avfilter_af_asettb_outputs[] = {

175 {

176 .name = "default",

177 .type = AVMEDIA_TYPE_AUDIO,

178 .config_props = config_output_props,

179 },

180 { NULL }

181 };

182

183 AVFilter avfilter_af_asettb = {

184 .name = "asettb",

185 .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),

186

187 .priv_size = sizeof(SetTBContext),

188 .inputs = avfilter_af_asettb_inputs,

189 .outputs = avfilter_af_asettb_outputs,

190 .priv_class = &asettb_class,

191 };

192 #endif

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