[libav.git] / libavfilter / vf_crop.c

/*
 * copyright (c) 2007 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
 * video crop filter
 */

#include "avfilter.h"
#include "libavutil/pixdesc.h"

typedef struct {
    int  x;             ///< x offset of the non-cropped area with respect to the input area
    int  y;             ///< y offset of the non-cropped area with respect to the input area
    int  w;             ///< width of the cropped area
    int  h;             ///< height of the cropped area

    int bpp;            ///< bits per pixel
    int hsub, vsub;     ///< chroma subsampling
} CropContext;

static int query_formats(AVFilterContext *ctx)
{
    static const enum PixelFormat pix_fmts[] = {
        PIX_FMT_RGB48BE,      PIX_FMT_RGB48LE,
        PIX_FMT_ARGB,         PIX_FMT_RGBA,
        PIX_FMT_ABGR,         PIX_FMT_BGRA,
        PIX_FMT_RGB24,        PIX_FMT_BGR24,
        PIX_FMT_RGB565BE,     PIX_FMT_RGB565LE,
        PIX_FMT_RGB555BE,     PIX_FMT_RGB555LE,
        PIX_FMT_BGR565BE,     PIX_FMT_BGR565LE,
        PIX_FMT_BGR555BE,     PIX_FMT_BGR555LE,
        PIX_FMT_GRAY16BE,     PIX_FMT_GRAY16LE,
        PIX_FMT_YUV420P16LE,  PIX_FMT_YUV420P16BE,
        PIX_FMT_YUV422P16LE,  PIX_FMT_YUV422P16BE,
        PIX_FMT_YUV444P16LE,  PIX_FMT_YUV444P16BE,
        PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
        PIX_FMT_YUV420P,      PIX_FMT_YUV411P,
        PIX_FMT_YUV410P,      PIX_FMT_YUV440P,
        PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
        PIX_FMT_YUVJ420P,     PIX_FMT_YUVJ440P,
        PIX_FMT_YUVA420P,
        PIX_FMT_RGB8,         PIX_FMT_BGR8,
        PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
        PIX_FMT_PAL8,         PIX_FMT_GRAY8,
        PIX_FMT_NONE
    };

    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));

    return 0;
}

static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
    CropContext *crop = ctx->priv;

    if (args)
        sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h);

    return 0;
}

static int config_input(AVFilterLink *link)
{
    AVFilterContext *ctx = link->dst;
    CropContext *crop = ctx->priv;

    switch (link->format) {
    case PIX_FMT_RGB48BE:
    case PIX_FMT_RGB48LE:
        crop->bpp = 48;
        break;
    case PIX_FMT_ARGB:
    case PIX_FMT_RGBA:
    case PIX_FMT_ABGR:
    case PIX_FMT_BGRA:
        crop->bpp = 32;
        break;
    case PIX_FMT_RGB24:
    case PIX_FMT_BGR24:
        crop->bpp = 24;
        break;
    case PIX_FMT_RGB565BE:
    case PIX_FMT_RGB565LE:
    case PIX_FMT_RGB555BE:
    case PIX_FMT_RGB555LE:
    case PIX_FMT_BGR565BE:
    case PIX_FMT_BGR565LE:
    case PIX_FMT_BGR555BE:
    case PIX_FMT_BGR555LE:
    case PIX_FMT_GRAY16BE:
    case PIX_FMT_GRAY16LE:
    case PIX_FMT_YUV420P16LE:
    case PIX_FMT_YUV420P16BE:
    case PIX_FMT_YUV422P16LE:
    case PIX_FMT_YUV422P16BE:
    case PIX_FMT_YUV444P16LE:
    case PIX_FMT_YUV444P16BE:
        crop->bpp = 16;
        break;
    default:
        crop->bpp = 8;
    }

    avcodec_get_chroma_sub_sample(link->format, &crop->hsub, &crop->vsub);

    if (crop->w == 0)
        crop->w = link->w - crop->x;
    if (crop->h == 0)
        crop->h = link->h - crop->y;

    crop->x &= ~((1 << crop->hsub) - 1);
    crop->y &= ~((1 << crop->vsub) - 1);

    av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n",
           crop->x, crop->y, crop->w, crop->h);

    if (crop->x <  0 || crop->y <  0                    ||
        crop->w <= 0 || crop->h <= 0                    ||
        (unsigned)crop->x + (unsigned)crop->w > link->w ||
        (unsigned)crop->y + (unsigned)crop->h > link->h) {
        av_log(ctx, AV_LOG_ERROR,
               "Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n",
               crop->x, crop->y, crop->w, crop->h, link->w, link->h);
        return -1;
    }

    return 0;
}

static int config_output(AVFilterLink *link)
{
    CropContext *crop = link->src->priv;

    link->w = crop->w;
    link->h = crop->h;

    return 0;
}

static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
    CropContext *crop = link->dst->priv;
    AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
    int i;

    ref2->w        = crop->w;
    ref2->h        = crop->h;

    ref2->data[0] += crop->y * ref2->linesize[0];
    ref2->data[0] += (crop->x * crop->bpp) >> 3;

    if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
        for (i = 1; i < 3; i ++) {
            if (ref2->data[i]) {
                ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
                ref2->data[i] += ((crop->x * crop->bpp) >> 3) >> crop->hsub;
            }
        }
    }

    /* alpha plane */
    if (ref2->data[3]) {
        ref2->data[3] += crop->y * ref2->linesize[3];
        ref2->data[3] += (crop->x * crop->bpp) >> 3;
    }

    avfilter_start_frame(link->dst->outputs[0], ref2);
}

static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
    AVFilterContext *ctx = link->dst;
    CropContext *crop = ctx->priv;

    if (y >= crop->y + crop->h || y + h <= crop->y)
        return;

    if (y < crop->y) {
        h -= crop->y - y;
        y  = crop->y;
    }
    if (y + h > crop->y + crop->h)
        h = crop->y + crop->h - y;

    avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
}

AVFilter avfilter_vf_crop = {
    .name      = "crop",
    .description = NULL_IF_CONFIG_SMALL("Crop the input video to x:y:width:height."),

    .priv_size = sizeof(CropContext),

    .query_formats = query_formats,
    .init          = init,

    .inputs    = (AVFilterPad[]) {{ .name             = "default",
                                    .type             = AVMEDIA_TYPE_VIDEO,
                                    .start_frame      = start_frame,
                                    .draw_slice       = draw_slice,
                                    .get_video_buffer = avfilter_null_get_video_buffer,
                                    .config_props     = config_input, },
                                  { .name = NULL}},
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
                                    .type             = AVMEDIA_TYPE_VIDEO,
                                    .config_props     = config_output, },
                                  { .name = NULL}},
};
Commit	Line	Data
190c1669 SS	1	/*
	2	* copyright (c) 2007 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	/**
ba87f080	22	* @file
190c1669 SS	23	* video crop filter
	24	*/
	25
	26	#include "avfilter.h"
ef9f8dd7	27	#include "libavutil/pixdesc.h"
190c1669 SS	28
	29	typedef struct {
	30	int x; ///< x offset of the non-cropped area with respect to the input area
	31	int y; ///< y offset of the non-cropped area with respect to the input area
	32	int w; ///< width of the cropped area
	33	int h; ///< height of the cropped area
	34
	35	int bpp; ///< bits per pixel
	36	int hsub, vsub; ///< chroma subsampling
	37	} CropContext;
	38
	39	static int query_formats(AVFilterContext *ctx)
	40	{
06718022	41	static const enum PixelFormat pix_fmts[] = {
190c1669 SS	42	PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
	43	PIX_FMT_ARGB, PIX_FMT_RGBA,
	44	PIX_FMT_ABGR, PIX_FMT_BGRA,
	45	PIX_FMT_RGB24, PIX_FMT_BGR24,
	46	PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
	47	PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
	48	PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
	49	PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
	50	PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
	51	PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
	52	PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
	53	PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
	54	PIX_FMT_YUV444P, PIX_FMT_YUV422P,
	55	PIX_FMT_YUV420P, PIX_FMT_YUV411P,
	56	PIX_FMT_YUV410P, PIX_FMT_YUV440P,
	57	PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
	58	PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
	59	PIX_FMT_YUVA420P,
190c1669 SS	60	PIX_FMT_RGB8, PIX_FMT_BGR8,
	61	PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
	62	PIX_FMT_PAL8, PIX_FMT_GRAY8,
	63	PIX_FMT_NONE
	64	};
	65
	66	avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
	67
	68	return 0;
	69	}
	70
	71	static av_cold int init(AVFilterContext ctx, const char args, void *opaque)
	72	{
	73	CropContext *crop = ctx->priv;
	74
	75	if (args)
	76	sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h);
	77
	78	return 0;
	79	}
	80
	81	static int config_input(AVFilterLink *link)
	82	{
	83	AVFilterContext *ctx = link->dst;
	84	CropContext *crop = ctx->priv;
	85
	86	switch (link->format) {
	87	case PIX_FMT_RGB48BE:
	88	case PIX_FMT_RGB48LE:
	89	crop->bpp = 48;
	90	break;
	91	case PIX_FMT_ARGB:
	92	case PIX_FMT_RGBA:
	93	case PIX_FMT_ABGR:
	94	case PIX_FMT_BGRA:
	95	crop->bpp = 32;
	96	break;
	97	case PIX_FMT_RGB24:
	98	case PIX_FMT_BGR24:
	99	crop->bpp = 24;
	100	break;
	101	case PIX_FMT_RGB565BE:
	102	case PIX_FMT_RGB565LE:
	103	case PIX_FMT_RGB555BE:
	104	case PIX_FMT_RGB555LE:
	105	case PIX_FMT_BGR565BE:
	106	case PIX_FMT_BGR565LE:
	107	case PIX_FMT_BGR555BE:
	108	case PIX_FMT_BGR555LE:
	109	case PIX_FMT_GRAY16BE:
	110	case PIX_FMT_GRAY16LE:
	111	case PIX_FMT_YUV420P16LE:
	112	case PIX_FMT_YUV420P16BE:
	113	case PIX_FMT_YUV422P16LE:
	114	case PIX_FMT_YUV422P16BE:
	115	case PIX_FMT_YUV444P16LE:
	116	case PIX_FMT_YUV444P16BE:
	117	crop->bpp = 16;
	118	break;
	119	default:
	120	crop->bpp = 8;
	121	}
	122
	123	avcodec_get_chroma_sub_sample(link->format, &crop->hsub, &crop->vsub);
124
125	if (crop->w == 0)
126	crop->w = link->w - crop->x;
127	if (crop->h == 0)
128	crop->h = link->h - crop->y;
129
130	crop->x &= ~((1 << crop->hsub) - 1);
131	crop->y &= ~((1 << crop->vsub) - 1);
132
133	av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n",
134	crop->x, crop->y, crop->w, crop->h);
135
136	if (crop->x < 0 \|\| crop->y < 0 \|\|
137	crop->w <= 0 \|\| crop->h <= 0 \|\|
138	(unsigned)crop->x + (unsigned)crop->w > link->w \|\|
139	(unsigned)crop->y + (unsigned)crop->h > link->h) {
140	av_log(ctx, AV_LOG_ERROR,
141	"Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n",
142	crop->x, crop->y, crop->w, crop->h, link->w, link->h);
143	return -1;
144	}
145
146	return 0;
147	}
148
149	static int config_output(AVFilterLink *link)
150	{
151	CropContext *crop = link->src->priv;
152
153	link->w = crop->w;
154	link->h = crop->h;
155
156	return 0;
157	}
158
190c1669 SS	159	static void start_frame(AVFilterLink link, AVFilterPicRef picref)
	160	{
	161	CropContext *crop = link->dst->priv;
	162	AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
	163	int i;
	164
	165	ref2->w = crop->w;
	166	ref2->h = crop->h;
	167
	168	ref2->data[0] += crop->y * ref2->linesize[0];
	169	ref2->data[0] += (crop->x * crop->bpp) >> 3;
	170
ef9f8dd7	171	if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
190c1669 SS	172	for (i = 1; i < 3; i ++) {
	173	if (ref2->data[i]) {
	174	ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
ac74dfa4	175	ref2->data[i] += ((crop->x * crop->bpp) >> 3) >> crop->hsub;
190c1669 SS	176	}
	177	}
	178	}
	179
	180	/* alpha plane */
	181	if (ref2->data[3]) {
	182	ref2->data[3] += crop->y * ref2->linesize[3];
	183	ref2->data[3] += (crop->x * crop->bpp) >> 3;
	184	}
	185
	186	avfilter_start_frame(link->dst->outputs[0], ref2);
	187	}
	188
a13a5437	189	static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
190c1669 SS	190	{
	191	AVFilterContext *ctx = link->dst;
	192	CropContext *crop = ctx->priv;
	193
	194	if (y >= crop->y + crop->h \|\| y + h <= crop->y)
	195	return;
	196
	197	if (y < crop->y) {
	198	h -= crop->y - y;
	199	y = crop->y;
	200	}
	201	if (y + h > crop->y + crop->h)
	202	h = crop->y + crop->h - y;
	203
a13a5437	204	avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
190c1669 SS	205	}
	206
	207	AVFilter avfilter_vf_crop = {
	208	.name = "crop",
b70bc022 SS	209	.description = NULL_IF_CONFIG_SMALL("Crop the input video to x:y:width:height."),
b70bc022 SS	210
190c1669 SS	211	.priv_size = sizeof(CropContext),
	212
	213	.query_formats = query_formats,
	214	.init = init,
	215
	216	.inputs = (AVFilterPad[]) {{ .name = "default",
72415b2a	217	.type = AVMEDIA_TYPE_VIDEO,
190c1669 SS	218	.start_frame = start_frame,
190c1669 SS	219	.draw_slice = draw_slice,
d313e17a	220	.get_video_buffer = avfilter_null_get_video_buffer,
190c1669 SS	221	.config_props = config_input, },
	222	{ .name = NULL}},
	223	.outputs = (AVFilterPad[]) {{ .name = "default",
72415b2a	224	.type = AVMEDIA_TYPE_VIDEO,
190c1669 SS	225	.config_props = config_output, },
	226	{ .name = NULL}},
	227	};