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1
/*
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 * Copyright (c) 2008 vmrsss
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 * Copyright (c) 2009 Stefano Sabatini
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/**
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 * @file
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 * video padding filter and color source
25
 */
26

    
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#include "avfilter.h"
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#include "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/colorspace.h"
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/parseutils.h"
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#include "drawutils.h"
36

    
37
static const char *var_names[] = {
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    "PI",
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    "PHI",
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    "E",
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    "in_w",   "iw",
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    "in_h",   "ih",
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    "out_w",  "ow",
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    "out_h",  "oh",
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    "x",
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    "y",
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    "a",
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    "hsub",
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    "vsub",
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    NULL
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};
52

    
53
enum var_name {
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    VAR_PI,
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    VAR_PHI,
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    VAR_E,
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    VAR_IN_W,   VAR_IW,
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    VAR_IN_H,   VAR_IH,
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    VAR_OUT_W,  VAR_OW,
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    VAR_OUT_H,  VAR_OH,
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    VAR_X,
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    VAR_Y,
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    VAR_A,
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    VAR_HSUB,
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    VAR_VSUB,
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    VARS_NB
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};
68

    
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static int query_formats(AVFilterContext *ctx)
70
{
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    static const enum PixelFormat pix_fmts[] = {
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        PIX_FMT_ARGB,         PIX_FMT_RGBA,
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        PIX_FMT_ABGR,         PIX_FMT_BGRA,
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        PIX_FMT_RGB24,        PIX_FMT_BGR24,
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        PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
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        PIX_FMT_YUV420P,      PIX_FMT_YUV411P,
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        PIX_FMT_YUV410P,      PIX_FMT_YUV440P,
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        PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
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        PIX_FMT_YUVJ420P,     PIX_FMT_YUVJ440P,
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        PIX_FMT_YUVA420P,
82

    
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        PIX_FMT_NONE
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    };
85

    
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    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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    return 0;
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}
89

    
90
typedef struct {
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    int w, h;               ///< output dimensions, a value of 0 will result in the input size
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    int x, y;               ///< offsets of the input area with respect to the padded area
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    int in_w, in_h;         ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
94

    
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    char w_expr[256];       ///< width  expression string
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    char h_expr[256];       ///< height expression string
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    char x_expr[256];       ///< width  expression string
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    char y_expr[256];       ///< height expression string
99

    
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    uint8_t color[4];       ///< color expressed either in YUVA or RGBA colorspace for the padding area
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    uint8_t *line[4];
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    int      line_step[4];
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    int hsub, vsub;         ///< chroma subsampling values
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    int needs_copy;
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} PadContext;
106

    
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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    PadContext *pad = ctx->priv;
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    char color_string[128] = "black";
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    av_strlcpy(pad->w_expr, "iw", sizeof(pad->w_expr));
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    av_strlcpy(pad->h_expr, "ih", sizeof(pad->h_expr));
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    av_strlcpy(pad->x_expr, "0" , sizeof(pad->w_expr));
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    av_strlcpy(pad->y_expr, "0" , sizeof(pad->h_expr));
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    if (args)
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        sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255s",
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               pad->w_expr, pad->h_expr, pad->x_expr, pad->y_expr, color_string);
120

    
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    if (av_parse_color(pad->color, color_string, -1, ctx) < 0)
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        return AVERROR(EINVAL);
123

    
124
    return 0;
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}
126

    
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static av_cold void uninit(AVFilterContext *ctx)
128
{
129
    PadContext *pad = ctx->priv;
130
    int i;
131

    
132
    for (i = 0; i < 4; i++) {
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        av_freep(&pad->line[i]);
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        pad->line_step[i] = 0;
135
    }
136
}
137

    
138
static int config_input(AVFilterLink *inlink)
139
{
140
    AVFilterContext *ctx = inlink->dst;
141
    PadContext *pad = ctx->priv;
142
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
143
    uint8_t rgba_color[4];
144
    int ret, is_packed_rgba;
145
    double var_values[VARS_NB], res;
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    char *expr;
147

    
148
    pad->hsub = pix_desc->log2_chroma_w;
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    pad->vsub = pix_desc->log2_chroma_h;
150

    
151
    var_values[VAR_PI]    = M_PI;
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    var_values[VAR_PHI]   = M_PHI;
153
    var_values[VAR_E]     = M_E;
154
    var_values[VAR_IN_W]  = var_values[VAR_IW] = inlink->w;
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    var_values[VAR_IN_H]  = var_values[VAR_IH] = inlink->h;
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    var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
157
    var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
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    var_values[VAR_A]     = (float) inlink->w / inlink->h;
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    var_values[VAR_HSUB]  = 1<<pad->hsub;
160
    var_values[VAR_VSUB]  = 2<<pad->vsub;
161

    
162
    /* evaluate width and height */
163
    av_expr_parse_and_eval(&res, (expr = pad->w_expr),
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                           var_names, var_values,
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                           NULL, NULL, NULL, NULL, NULL, 0, ctx);
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    pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
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    if ((ret = av_expr_parse_and_eval(&res, (expr = pad->h_expr),
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                                      var_names, var_values,
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                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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        goto eval_fail;
171
    pad->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
172
    /* evaluate the width again, as it may depend on the evaluated output height */
173
    if ((ret = av_expr_parse_and_eval(&res, (expr = pad->w_expr),
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                                      var_names, var_values,
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                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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        goto eval_fail;
177
    pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
178

    
179
    /* evaluate x and y */
180
    av_expr_parse_and_eval(&res, (expr = pad->x_expr),
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                           var_names, var_values,
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                           NULL, NULL, NULL, NULL, NULL, 0, ctx);
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    pad->x = var_values[VAR_X] = res;
184
    if ((ret = av_expr_parse_and_eval(&res, (expr = pad->y_expr),
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                                      var_names, var_values,
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                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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        goto eval_fail;
188
    pad->y = var_values[VAR_Y] = res;
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    /* evaluate x again, as it may depend on the evaluated y value */
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    if ((ret = av_expr_parse_and_eval(&res, (expr = pad->x_expr),
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                                      var_names, var_values,
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                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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        goto eval_fail;
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    pad->x = var_values[VAR_X] = res;
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196
    /* sanity check params */
197
    if (pad->w < 0 || pad->h < 0 || pad->x < 0 || pad->y < 0) {
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        av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n");
199
        return AVERROR(EINVAL);
200
    }
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202
    if (!pad->w)
203
        pad->w = inlink->w;
204
    if (!pad->h)
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        pad->h = inlink->h;
206

    
207
    pad->w &= ~((1 << pad->hsub) - 1);
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    pad->h &= ~((1 << pad->vsub) - 1);
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    pad->x &= ~((1 << pad->hsub) - 1);
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    pad->y &= ~((1 << pad->vsub) - 1);
211

    
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    pad->in_w = inlink->w & ~((1 << pad->hsub) - 1);
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    pad->in_h = inlink->h & ~((1 << pad->vsub) - 1);
214

    
215
    memcpy(rgba_color, pad->color, sizeof(rgba_color));
216
    ff_fill_line_with_color(pad->line, pad->line_step, pad->w, pad->color,
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                            inlink->format, rgba_color, &is_packed_rgba, NULL);
218

    
219
    av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X[%s]\n",
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           inlink->w, inlink->h, pad->w, pad->h, pad->x, pad->y,
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           pad->color[0], pad->color[1], pad->color[2], pad->color[3],
222
           is_packed_rgba ? "rgba" : "yuva");
223

    
224
    if (pad->x <  0 || pad->y <  0                      ||
225
        pad->w <= 0 || pad->h <= 0                      ||
226
        (unsigned)pad->x + (unsigned)inlink->w > pad->w ||
227
        (unsigned)pad->y + (unsigned)inlink->h > pad->h) {
228
        av_log(ctx, AV_LOG_ERROR,
229
               "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
230
               pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h);
231
        return AVERROR(EINVAL);
232
    }
233

    
234
    return 0;
235

    
236
eval_fail:
237
    av_log(NULL, AV_LOG_ERROR,
238
           "Error when evaluating the expression '%s'\n", expr);
239
    return ret;
240

    
241
}
242

    
243
static int config_output(AVFilterLink *outlink)
244
{
245
    PadContext *pad = outlink->src->priv;
246

    
247
    outlink->w = pad->w;
248
    outlink->h = pad->h;
249
    return 0;
250
}
251

    
252
static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
253
{
254
    PadContext *pad = inlink->dst->priv;
255

    
256
    AVFilterBufferRef *picref = avfilter_get_video_buffer(inlink->dst->outputs[0], perms,
257
                                                       w + (pad->w - pad->in_w),
258
                                                       h + (pad->h - pad->in_h));
259
    int plane;
260

    
261
    picref->video->w = w;
262
    picref->video->h = h;
263

    
264
    for (plane = 0; plane < 4 && picref->data[plane]; plane++) {
265
        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
266
        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
267

    
268
        picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
269
            (pad->y >> vsub) * picref->linesize[plane];
270
    }
271

    
272
    return picref;
273
}
274

    
275
static int does_clip(PadContext *pad, AVFilterBufferRef *outpicref, int plane, int hsub, int vsub, int x, int y)
276
{
277
    int64_t x_in_buf, y_in_buf;
278

    
279
    x_in_buf =  outpicref->data[plane] - outpicref->buf->data[plane]
280
             +  (x >> hsub) * pad      ->line_step[plane]
281
             +  (y >> vsub) * outpicref->linesize [plane];
282

    
283
    if(x_in_buf < 0 || x_in_buf % pad->line_step[plane])
284
        return 1;
285
    x_in_buf /= pad->line_step[plane];
286

    
287
    av_assert0(outpicref->buf->linesize[plane]>0); //while reference can use negative linesize the main buffer should not
288

    
289
    y_in_buf = x_in_buf / outpicref->buf->linesize[plane];
290
    x_in_buf %= outpicref->buf->linesize[plane];
291

    
292
    if(   y_in_buf<<vsub >= outpicref->buf->h
293
       || x_in_buf<<hsub >= outpicref->buf->w)
294
        return 1;
295
    return 0;
296
}
297

    
298
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
299
{
300
    PadContext *pad = inlink->dst->priv;
301
    AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
302
    int plane;
303

    
304
    for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
305
        int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
306
        int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
307

    
308
        av_assert0(outpicref->buf->w>0 && outpicref->buf->h>0);
309

    
310
        if(outpicref->format != outpicref->buf->format) //unsupported currently
311
            break;
312

    
313
        outpicref->data[plane] -=   (pad->x  >> hsub) * pad      ->line_step[plane]
314
                                  + (pad->y  >> vsub) * outpicref->linesize [plane];
315

    
316
        if(   does_clip(pad, outpicref, plane, hsub, vsub, 0, 0)
317
           || does_clip(pad, outpicref, plane, hsub, vsub, 0, pad->h-1)
318
           || does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, 0)
319
           || does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, pad->h-1)
320
          )
321
            break;
322
    }
323
    pad->needs_copy= plane < 4 && outpicref->data[plane];
324
    if(pad->needs_copy){
325
        av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
326
        avfilter_unref_buffer(outpicref);
327
        outpicref = avfilter_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES,
328
                                                       FFMAX(inlink->w, pad->w),
329
                                                       FFMAX(inlink->h, pad->h));
330
        avfilter_copy_buffer_ref_props(outpicref, inpicref);
331
    }
332

    
333
    inlink->dst->outputs[0]->out_buf = outpicref;
334

    
335
    outpicref->video->w = pad->w;
336
    outpicref->video->h = pad->h;
337

    
338
    avfilter_start_frame(inlink->dst->outputs[0], outpicref);
339
}
340

    
341
static void end_frame(AVFilterLink *link)
342
{
343
    avfilter_end_frame(link->dst->outputs[0]);
344
    avfilter_unref_buffer(link->cur_buf);
345
}
346

    
347
static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
348
{
349
    PadContext *pad = link->dst->priv;
350
    int bar_y, bar_h = 0;
351

    
352
    if        (slice_dir * before_slice ==  1 && y == pad->y) {
353
        /* top bar */
354
        bar_y = 0;
355
        bar_h = pad->y;
356
    } else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
357
        /* bottom bar */
358
        bar_y = pad->y + pad->in_h;
359
        bar_h = pad->h - pad->in_h - pad->y;
360
    }
361

    
362
    if (bar_h) {
363
        ff_draw_rectangle(link->dst->outputs[0]->out_buf->data,
364
                          link->dst->outputs[0]->out_buf->linesize,
365
                          pad->line, pad->line_step, pad->hsub, pad->vsub,
366
                          0, bar_y, pad->w, bar_h);
367
        avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
368
    }
369
}
370

    
371
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
372
{
373
    PadContext *pad = link->dst->priv;
374
    AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf;
375
    AVFilterBufferRef *inpic = link->cur_buf;
376

    
377
    y += pad->y;
378

    
379
    y &= ~((1 << pad->vsub) - 1);
380
    h &= ~((1 << pad->vsub) - 1);
381

    
382
    if (!h)
383
        return;
384
    draw_send_bar_slice(link, y, h, slice_dir, 1);
385

    
386
    /* left border */
387
    ff_draw_rectangle(outpic->data, outpic->linesize, pad->line, pad->line_step,
388
                      pad->hsub, pad->vsub, 0, y, pad->x, h);
389

    
390
    if(pad->needs_copy){
391
        ff_copy_rectangle(outpic->data, outpic->linesize,
392
                          inpic->data, inpic->linesize, pad->line_step,
393
                          pad->hsub, pad->vsub,
394
                          pad->x, y, y-pad->y, inpic->video->w, h);
395
    }
396

    
397
    /* right border */
398
    ff_draw_rectangle(outpic->data, outpic->linesize,
399
                      pad->line, pad->line_step, pad->hsub, pad->vsub,
400
                      pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
401
    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
402

    
403
    draw_send_bar_slice(link, y, h, slice_dir, -1);
404
}
405

    
406
AVFilter avfilter_vf_pad = {
407
    .name          = "pad",
408
    .description   = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
409

    
410
    .priv_size     = sizeof(PadContext),
411
    .init          = init,
412
    .uninit        = uninit,
413
    .query_formats = query_formats,
414

    
415
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
416
                                    .type             = AVMEDIA_TYPE_VIDEO,
417
                                    .config_props     = config_input,
418
                                    .get_video_buffer = get_video_buffer,
419
                                    .start_frame      = start_frame,
420
                                    .draw_slice       = draw_slice,
421
                                    .end_frame        = end_frame, },
422
                                  { .name = NULL}},
423

    
424
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
425
                                    .type             = AVMEDIA_TYPE_VIDEO,
426
                                    .config_props     = config_output, },
427
                                  { .name = NULL}},
428
};