[deb_ffmpeg.git] / ffmpeg / libavfilter / vf_aspect.c

/*
 * Copyright (c) 2010 Bobby Bingham
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * aspect ratio modification video filters
 */

#include <float.h>

#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"

#include "avfilter.h"
#include "internal.h"
#include "video.h"

static const char *const var_names[] = {
    "w",
    "h",
    "a", "dar",
    "sar",
    "hsub",
    "vsub",
    NULL
};

enum var_name {
    VAR_W,
    VAR_H,
    VAR_A, VAR_DAR,
    VAR_SAR,
    VAR_HSUB,
    VAR_VSUB,
    VARS_NB
};

typedef struct AspectContext {
    const AVClass *class;
    AVRational dar;
    AVRational sar;
    int max;
#if FF_API_OLD_FILTER_OPTS
    float aspect_den;
#endif
    char *ratio_expr;
} AspectContext;

static av_cold int init(AVFilterContext *ctx)
{
    AspectContext *s = ctx->priv;
    int ret;

#if FF_API_OLD_FILTER_OPTS
    if (s->ratio_expr && s->aspect_den > 0) {
        double num;
        av_log(ctx, AV_LOG_WARNING,
               "num:den syntax is deprecated, please use num/den or named options instead\n");
        ret = av_expr_parse_and_eval(&num, s->ratio_expr, NULL, NULL,
                                     NULL, NULL, NULL, NULL, NULL, 0, ctx);
        if (ret < 0) {
            av_log(ctx, AV_LOG_ERROR, "Unable to parse ratio numerator \"%s\"\n", s->ratio_expr);
            return AVERROR(EINVAL);
        }
        s->sar = s->dar = av_d2q(num / s->aspect_den, s->max);
    }
#endif

    return 0;
}

static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
    AspectContext *s = link->dst->priv;

    frame->sample_aspect_ratio = s->sar;
    return ff_filter_frame(link->dst->outputs[0], frame);
}

#define OFFSET(x) offsetof(AspectContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h)
{
    if (sar.num && sar.den) {
        av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX);
    } else {
        av_reduce(&dar->num, &dar->den, w, h, INT_MAX);
    }
}

static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
{
    AVFilterContext *ctx = inlink->dst;
    AspectContext *s = inlink->dst->priv;
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
    double var_values[VARS_NB], res;
    int ret;

    var_values[VAR_W]     = inlink->w;
    var_values[VAR_H]     = inlink->h;
    var_values[VAR_A]     = (double) inlink->w / inlink->h;
    var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ?
        (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
    var_values[VAR_DAR]   = var_values[VAR_A] * var_values[VAR_SAR];
    var_values[VAR_HSUB]  = 1 << desc->log2_chroma_w;
    var_values[VAR_VSUB]  = 1 << desc->log2_chroma_h;

    /* evaluate new aspect ratio*/
    ret = av_expr_parse_and_eval(&res, s->ratio_expr,
                                      var_names, var_values,
                                      NULL, NULL, NULL, NULL, NULL, 0, ctx);
    if (ret < 0) {
        ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx);
    } else
        *aspect_ratio = av_d2q(res, s->max);

    if (ret < 0) {
        av_log(ctx, AV_LOG_ERROR,
               "Error when evaluating the expression '%s'\n", s->ratio_expr);
        return ret;
    }
    if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) {
        av_log(ctx, AV_LOG_ERROR,
                "Invalid string '%s' for aspect ratio\n", s->ratio_expr);
        return AVERROR(EINVAL);
    }
    return 0;
}

#if CONFIG_SETDAR_FILTER

static int setdar_config_props(AVFilterLink *inlink)
{
    AspectContext *s = inlink->dst->priv;
    AVRational dar;
    AVRational old_dar;
    AVRational old_sar = inlink->sample_aspect_ratio;
    int ret;

#if FF_API_OLD_FILTER_OPTS
    if (!(s->ratio_expr && s->aspect_den > 0)) {
#endif
    if ((ret = get_aspect_ratio(inlink, &s->dar)))
        return ret;
#if FF_API_OLD_FILTER_OPTS
    }
#endif

    if (s->dar.num && s->dar.den) {
        av_reduce(&s->sar.num, &s->sar.den,
                   s->dar.num * inlink->h,
                   s->dar.den * inlink->w, INT_MAX);
        inlink->sample_aspect_ratio = s->sar;
        dar = s->dar;
    } else {
        inlink->sample_aspect_ratio = (AVRational){ 1, 1 };
        dar = (AVRational){ inlink->w, inlink->h };
    }

    compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
    av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n",
           inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den,
           dar.num, dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den);

    return 0;
}

static const AVOption setdar_options[] = {
    { "dar",   "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
    { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
    { "r",     "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
#if FF_API_OLD_FILTER_OPTS
    { "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
#endif
    { "max",   "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(setdar);

static const AVFilterPad avfilter_vf_setdar_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = setdar_config_props,
        .filter_frame = filter_frame,
    },
    { NULL }
};

static const AVFilterPad avfilter_vf_setdar_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

AVFilter ff_vf_setdar = {
    .name        = "setdar",
    .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
    .init        = init,
    .priv_size   = sizeof(AspectContext),
    .priv_class  = &setdar_class,
    .inputs      = avfilter_vf_setdar_inputs,
    .outputs     = avfilter_vf_setdar_outputs,
};

#endif /* CONFIG_SETDAR_FILTER */

#if CONFIG_SETSAR_FILTER

static int setsar_config_props(AVFilterLink *inlink)
{
    AspectContext *s = inlink->dst->priv;
    AVRational old_sar = inlink->sample_aspect_ratio;
    AVRational old_dar, dar;
    int ret;

#if FF_API_OLD_FILTER_OPTS
    if (!(s->ratio_expr && s->aspect_den > 0)) {
#endif
    if ((ret = get_aspect_ratio(inlink, &s->sar)))
        return ret;
#if FF_API_OLD_FILTER_OPTS
    }
#endif

    inlink->sample_aspect_ratio = s->sar;

    compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
    compute_dar(&dar, s->sar, inlink->w, inlink->h);
    av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n",
           inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den,
           inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den, dar.num, dar.den);

    return 0;
}

static const AVOption setsar_options[] = {
    { "sar",   "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
    { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
    { "r",     "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
#if FF_API_OLD_FILTER_OPTS
    { "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
#endif
    { "max",   "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(setsar);

static const AVFilterPad avfilter_vf_setsar_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = setsar_config_props,
        .filter_frame = filter_frame,
    },
    { NULL }
};

static const AVFilterPad avfilter_vf_setsar_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

AVFilter ff_vf_setsar = {
    .name        = "setsar",
    .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
    .init        = init,
    .priv_size   = sizeof(AspectContext),
    .priv_class  = &setsar_class,
    .inputs      = avfilter_vf_setsar_inputs,
    .outputs     = avfilter_vf_setsar_outputs,
};

#endif /* CONFIG_SETSAR_FILTER */
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (c) 2010 Bobby Bingham
	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	* aspect ratio modification video filters
	24	*/
	25
	26	#include <float.h>
	27
	28	#include "libavutil/common.h"
	29	#include "libavutil/eval.h"
	30	#include "libavutil/mathematics.h"
	31	#include "libavutil/opt.h"
	32	#include "libavutil/parseutils.h"
	33	#include "libavutil/pixdesc.h"
	34
	35	#include "avfilter.h"
	36	#include "internal.h"
	37	#include "video.h"
	38
	39	static const char *const var_names[] = {
	40	"w",
	41	"h",
	42	"a", "dar",
	43	"sar",
	44	"hsub",
	45	"vsub",
	46	NULL
	47	};
	48
	49	enum var_name {
	50	VAR_W,
	51	VAR_H,
	52	VAR_A, VAR_DAR,
	53	VAR_SAR,
	54	VAR_HSUB,
	55	VAR_VSUB,
	56	VARS_NB
	57	};
	58
	59	typedef struct AspectContext {
	60	const AVClass *class;
	61	AVRational dar;
	62	AVRational sar;
	63	int max;
	64	#if FF_API_OLD_FILTER_OPTS
65	float aspect_den;
66	#endif
67	char *ratio_expr;
68	} AspectContext;
69
70	static av_cold int init(AVFilterContext *ctx)
71	{
72	AspectContext *s = ctx->priv;
73	int ret;
74
75	#if FF_API_OLD_FILTER_OPTS
76	if (s->ratio_expr && s->aspect_den > 0) {
77	double num;
78	av_log(ctx, AV_LOG_WARNING,
79	"num:den syntax is deprecated, please use num/den or named options instead\n");
80	ret = av_expr_parse_and_eval(&num, s->ratio_expr, NULL, NULL,
81	NULL, NULL, NULL, NULL, NULL, 0, ctx);
82	if (ret < 0) {
83	av_log(ctx, AV_LOG_ERROR, "Unable to parse ratio numerator \"%s\"\n", s->ratio_expr);
84	return AVERROR(EINVAL);
85	}
86	s->sar = s->dar = av_d2q(num / s->aspect_den, s->max);
87	}
88	#endif
89
90	return 0;
91	}
92
93	static int filter_frame(AVFilterLink link, AVFrame frame)
94	{
95	AspectContext *s = link->dst->priv;
96
97	frame->sample_aspect_ratio = s->sar;
98	return ff_filter_frame(link->dst->outputs[0], frame);
99	}
100
101	#define OFFSET(x) offsetof(AspectContext, x)
102	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM
103
104	static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h)
105	{
106	if (sar.num && sar.den) {
107	av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX);
108	} else {
109	av_reduce(&dar->num, &dar->den, w, h, INT_MAX);
110	}
111	}
112
113	static int get_aspect_ratio(AVFilterLink inlink, AVRational aspect_ratio)
114	{
115	AVFilterContext *ctx = inlink->dst;
116	AspectContext *s = inlink->dst->priv;
117	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
118	double var_values[VARS_NB], res;
119	int ret;
120
121	var_values[VAR_W] = inlink->w;
122	var_values[VAR_H] = inlink->h;
123	var_values[VAR_A] = (double) inlink->w / inlink->h;
124	var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
125	(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
126	var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
127	var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
128	var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
129
130	/* evaluate new aspect ratio*/
131	ret = av_expr_parse_and_eval(&res, s->ratio_expr,
132	var_names, var_values,
133	NULL, NULL, NULL, NULL, NULL, 0, ctx);
134	if (ret < 0) {
135	ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx);
136	} else
137	*aspect_ratio = av_d2q(res, s->max);
138
139	if (ret < 0) {
140	av_log(ctx, AV_LOG_ERROR,
141	"Error when evaluating the expression '%s'\n", s->ratio_expr);
142	return ret;
143	}
144	if (aspect_ratio->num < 0 \|\| aspect_ratio->den <= 0) {
145	av_log(ctx, AV_LOG_ERROR,
146	"Invalid string '%s' for aspect ratio\n", s->ratio_expr);
147	return AVERROR(EINVAL);
148	}
149	return 0;
150	}
151
152	#if CONFIG_SETDAR_FILTER
153
154	static int setdar_config_props(AVFilterLink *inlink)
155	{
156	AspectContext *s = inlink->dst->priv;
157	AVRational dar;
158	AVRational old_dar;
159	AVRational old_sar = inlink->sample_aspect_ratio;
160	int ret;
161
162	#if FF_API_OLD_FILTER_OPTS
163	if (!(s->ratio_expr && s->aspect_den > 0)) {
164	#endif
165	if ((ret = get_aspect_ratio(inlink, &s->dar)))
166	return ret;
167	#if FF_API_OLD_FILTER_OPTS
168	}
169	#endif
170
171	if (s->dar.num && s->dar.den) {
172	av_reduce(&s->sar.num, &s->sar.den,
173	s->dar.num * inlink->h,
174	s->dar.den * inlink->w, INT_MAX);
175	inlink->sample_aspect_ratio = s->sar;
176	dar = s->dar;
177	} else {
178	inlink->sample_aspect_ratio = (AVRational){ 1, 1 };
179	dar = (AVRational){ inlink->w, inlink->h };
180	}
181
182	compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
183	av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n",
184	inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den,
185	dar.num, dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den);
186
187	return 0;
188	}
189
190	static const AVOption setdar_options[] = {
191	{ "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
192	{ "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
193	{ "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
194	#if FF_API_OLD_FILTER_OPTS
195	{ "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
196	#endif
197	{ "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
198	{ NULL }
199	};
200
201	AVFILTER_DEFINE_CLASS(setdar);
202
203	static const AVFilterPad avfilter_vf_setdar_inputs[] = {
204	{
205	.name = "default",
206	.type = AVMEDIA_TYPE_VIDEO,
207	.config_props = setdar_config_props,
208	.filter_frame = filter_frame,
209	},
210	{ NULL }
211	};
212
213	static const AVFilterPad avfilter_vf_setdar_outputs[] = {
214	{
215	.name = "default",
216	.type = AVMEDIA_TYPE_VIDEO,
217	},
218	{ NULL }
219	};
220
221	AVFilter ff_vf_setdar = {
222	.name = "setdar",
223	.description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
224	.init = init,
225	.priv_size = sizeof(AspectContext),
226	.priv_class = &setdar_class,
227	.inputs = avfilter_vf_setdar_inputs,
228	.outputs = avfilter_vf_setdar_outputs,
229	};
230
231	#endif /* CONFIG_SETDAR_FILTER */
232
233	#if CONFIG_SETSAR_FILTER
234
235	static int setsar_config_props(AVFilterLink *inlink)
236	{
237	AspectContext *s = inlink->dst->priv;
238	AVRational old_sar = inlink->sample_aspect_ratio;
239	AVRational old_dar, dar;
240	int ret;
241
242	#if FF_API_OLD_FILTER_OPTS
243	if (!(s->ratio_expr && s->aspect_den > 0)) {
244	#endif
245	if ((ret = get_aspect_ratio(inlink, &s->sar)))
246	return ret;
247	#if FF_API_OLD_FILTER_OPTS
248	}
249	#endif
250
251	inlink->sample_aspect_ratio = s->sar;
252
253	compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
254	compute_dar(&dar, s->sar, inlink->w, inlink->h);
255	av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n",
256	inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den,
257	inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den, dar.num, dar.den);
258
259	return 0;
260	}
261
262	static const AVOption setsar_options[] = {
263	{ "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
264	{ "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
265	{ "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
266	#if FF_API_OLD_FILTER_OPTS
267	{ "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
268	#endif
269	{ "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
270	{ NULL }
271	};
272
273	AVFILTER_DEFINE_CLASS(setsar);
274
275	static const AVFilterPad avfilter_vf_setsar_inputs[] = {
276	{
277	.name = "default",
278	.type = AVMEDIA_TYPE_VIDEO,
279	.config_props = setsar_config_props,
280	.filter_frame = filter_frame,
281	},
282	{ NULL }
283	};
284
285	static const AVFilterPad avfilter_vf_setsar_outputs[] = {
286	{
287	.name = "default",
288	.type = AVMEDIA_TYPE_VIDEO,
289	},
290	{ NULL }
291	};
292
293	AVFilter ff_vf_setsar = {
294	.name = "setsar",
295	.description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
296	.init = init,
297	.priv_size = sizeof(AspectContext),
298	.priv_class = &setsar_class,
299	.inputs = avfilter_vf_setsar_inputs,
300	.outputs = avfilter_vf_setsar_outputs,
301	};
302
303	#endif /* CONFIG_SETSAR_FILTER */