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FFmpeg/libavfilter/vf_scale.c
Bela Bodecs 868a2ed568 vf_scale: Detecting changes of incoming frame properties and dinamically evaluate width and height expressions 
Currently scale filter accepts expressions in its width and height
parameters but evaluates them only once at init and replaces them with
their actual values. Later on, if any parameter of incoming frames
changes - ie those were used in the original size expressions -  then
they new values will not have any affect for width and heigth values.
They remain the same. This patch makes possible that width and height
expressions be evaluated frame-by-frame basis if width/height/sar/format
properties of incoming frame would change. To retain the current
behaviour and not to break any earlier app, a new config parameter has
been introduced. Its name is "eval" and it has two distinct values:
"init" and "frame". The default value is "init".
This feature is very usefull in case of DVBT mpeg-ts streams where SAR
may change time-by-time from 4/3 to 16/9 and vica-versa and the size
remains the same and you want to create a variable sized output with 1/1
SAR.

Signed-off-by: Bela Bodecs <bodecsb@vivanet.hu>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-01-20 13:32:00 +01:00

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/*
* 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
* scale video filter
*/
#include <stdio.h>
#include <string.h>
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/avstring.h"
#include "libavutil/eval.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"
#include "libswscale/swscale.h"
static const char *const var_names[] = {
"in_w", "iw",
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"a",
"sar",
"dar",
"hsub",
"vsub",
"ohsub",
"ovsub",
NULL
};
enum var_name {
VAR_IN_W, VAR_IW,
VAR_IN_H, VAR_IH,
VAR_OUT_W, VAR_OW,
VAR_OUT_H, VAR_OH,
VAR_A,
VAR_SAR,
VAR_DAR,
VAR_HSUB,
VAR_VSUB,
VAR_OHSUB,
VAR_OVSUB,
VARS_NB
};
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
typedef struct ScaleContext {
const AVClass *class;
struct SwsContext *sws; ///< software scaler context
struct SwsContext *isws[2]; ///< software scaler context for interlaced material
AVDictionary *opts;
/**
* New dimensions. Special values are:
* 0 = original width/height
* -1 = keep original aspect
* -N = try to keep aspect but make sure it is divisible by N
*/
int w, h;
char *size_str;
unsigned int flags; ///sws flags
double param[2]; // sws params
int hsub, vsub; ///< chroma subsampling
int slice_y; ///< top of current output slice
int input_is_pal; ///< set to 1 if the input format is paletted
int output_is_pal; ///< set to 1 if the output format is paletted
int interlaced;
char *w_expr; ///< width expression string
char *h_expr; ///< height expression string
char *flags_str;
char *in_color_matrix;
char *out_color_matrix;
int in_range;
int out_range;
int out_h_chr_pos;
int out_v_chr_pos;
int in_h_chr_pos;
int in_v_chr_pos;
int force_original_aspect_ratio;
int nb_slices;
int eval_mode; ///< expression evaluation mode
} ScaleContext;
AVFilter ff_vf_scale2ref;
static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
{
ScaleContext *scale = ctx->priv;
int ret;
if (scale->size_str && (scale->w_expr || scale->h_expr)) {
av_log(ctx, AV_LOG_ERROR,
"Size and width/height expressions cannot be set at the same time.\n");
return AVERROR(EINVAL);
}
if (scale->w_expr && !scale->h_expr)
FFSWAP(char *, scale->w_expr, scale->size_str);
if (scale->size_str) {
char buf[32];
if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid size '%s'\n", scale->size_str);
return ret;
}
snprintf(buf, sizeof(buf)-1, "%d", scale->w);
av_opt_set(scale, "w", buf, 0);
snprintf(buf, sizeof(buf)-1, "%d", scale->h);
av_opt_set(scale, "h", buf, 0);
}
if (!scale->w_expr)
av_opt_set(scale, "w", "iw", 0);
if (!scale->h_expr)
av_opt_set(scale, "h", "ih", 0);
av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",
scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);
scale->flags = 0;
if (scale->flags_str) {
const AVClass *class = sws_get_class();
const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
AV_OPT_SEARCH_FAKE_OBJ);
int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);
if (ret < 0)
return ret;
}
scale->opts = *opts;
*opts = NULL;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
sws_freeContext(scale->sws);
sws_freeContext(scale->isws[0]);
sws_freeContext(scale->isws[1]);
scale->sws = NULL;
av_dict_free(&scale->opts);
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats;
enum AVPixelFormat pix_fmt;
int ret;
if (ctx->inputs[0]) {
const AVPixFmtDescriptor *desc = NULL;
formats = NULL;
while ((desc = av_pix_fmt_desc_next(desc))) {
pix_fmt = av_pix_fmt_desc_get_id(desc);
if ((sws_isSupportedInput(pix_fmt) ||
sws_isSupportedEndiannessConversion(pix_fmt))
&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
return ret;
}
}
if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->out_formats)) < 0)
return ret;
}
if (ctx->outputs[0]) {
const AVPixFmtDescriptor *desc = NULL;
formats = NULL;
while ((desc = av_pix_fmt_desc_next(desc))) {
pix_fmt = av_pix_fmt_desc_get_id(desc);
if ((sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8 ||
sws_isSupportedEndiannessConversion(pix_fmt))
&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
return ret;
}
}
if ((ret = ff_formats_ref(formats, &ctx->outputs[0]->in_formats)) < 0)
return ret;
}
return 0;
}
static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)
{
if (!s)
s = "bt601";
if (s && strstr(s, "bt709")) {
colorspace = AVCOL_SPC_BT709;
} else if (s && strstr(s, "fcc")) {
colorspace = AVCOL_SPC_FCC;
} else if (s && strstr(s, "smpte240m")) {
colorspace = AVCOL_SPC_SMPTE240M;
} else if (s && (strstr(s, "bt601") || strstr(s, "bt470") || strstr(s, "smpte170m"))) {
colorspace = AVCOL_SPC_BT470BG;
}
if (colorspace < 1 || colorspace > 7) {
colorspace = AVCOL_SPC_BT470BG;
}
return sws_getCoefficients(colorspace);
}
static int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink0 = outlink->src->inputs[0];
AVFilterLink *inlink = ctx->filter == &ff_vf_scale2ref ?
outlink->src->inputs[1] :
outlink->src->inputs[0];
enum AVPixelFormat outfmt = outlink->format;
ScaleContext *scale = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format);
int64_t w, h;
double var_values[VARS_NB], res;
char *expr;
int ret;
int factor_w, factor_h;
var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
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;
var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;
var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
/* evaluate width and height */
av_expr_parse_and_eval(&res, (expr = scale->w_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx);
scale->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
if ((ret = av_expr_parse_and_eval(&res, (expr = scale->h_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto fail;
scale->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
/* evaluate again the width, as it may depend on the output height */
if ((ret = av_expr_parse_and_eval(&res, (expr = scale->w_expr),
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto fail;
scale->w = res;
w = scale->w;
h = scale->h;
/* Check if it is requested that the result has to be divisible by a some
* factor (w or h = -n with n being the factor). */
factor_w = 1;
factor_h = 1;
if (w < -1) {
factor_w = -w;
}
if (h < -1) {
factor_h = -h;
}
if (w < 0 && h < 0)
scale->w = scale->h = 0;
if (!(w = scale->w))
w = inlink->w;
if (!(h = scale->h))
h = inlink->h;
/* Make sure that the result is divisible by the factor we determined
* earlier. If no factor was set, it is nothing will happen as the default
* factor is 1 */
if (w < 0)
w = av_rescale(h, inlink->w, inlink->h * factor_w) * factor_w;
if (h < 0)
h = av_rescale(w, inlink->h, inlink->w * factor_h) * factor_h;
/* Note that force_original_aspect_ratio may overwrite the previous set
* dimensions so that it is not divisible by the set factors anymore. */
if (scale->force_original_aspect_ratio) {
int tmp_w = av_rescale(h, inlink->w, inlink->h);
int tmp_h = av_rescale(w, inlink->h, inlink->w);
if (scale->force_original_aspect_ratio == 1) {
w = FFMIN(tmp_w, w);
h = FFMIN(tmp_h, h);
} else {
w = FFMAX(tmp_w, w);
h = FFMAX(tmp_h, h);
}
}
if (w > INT_MAX || h > INT_MAX ||
(h * inlink->w) > INT_MAX ||
(w * inlink->h) > INT_MAX)
av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
outlink->w = w;
outlink->h = h;
/* TODO: make algorithm configurable */
scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;
if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PAL ||
av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;
if (scale->sws)
sws_freeContext(scale->sws);
if (scale->isws[0])
sws_freeContext(scale->isws[0]);
if (scale->isws[1])
sws_freeContext(scale->isws[1]);
scale->isws[0] = scale->isws[1] = scale->sws = NULL;
if (inlink0->w == outlink->w &&
inlink0->h == outlink->h &&
!scale->out_color_matrix &&
scale->in_range == scale->out_range &&
inlink0->format == outlink->format)
;
else {
struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};
int i;
for (i = 0; i < 3; i++) {
struct SwsContext **s = swscs[i];
*s = sws_alloc_context();
if (!*s)
return AVERROR(ENOMEM);
av_opt_set_int(*s, "srcw", inlink0 ->w, 0);
av_opt_set_int(*s, "srch", inlink0 ->h >> !!i, 0);
av_opt_set_int(*s, "src_format", inlink0->format, 0);
av_opt_set_int(*s, "dstw", outlink->w, 0);
av_opt_set_int(*s, "dsth", outlink->h >> !!i, 0);
av_opt_set_int(*s, "dst_format", outfmt, 0);
av_opt_set_int(*s, "sws_flags", scale->flags, 0);
av_opt_set_int(*s, "param0", scale->param[0], 0);
av_opt_set_int(*s, "param1", scale->param[1], 0);
if (scale->in_range != AVCOL_RANGE_UNSPECIFIED)
av_opt_set_int(*s, "src_range",
scale->in_range == AVCOL_RANGE_JPEG, 0);
if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
av_opt_set_int(*s, "dst_range",
scale->out_range == AVCOL_RANGE_JPEG, 0);
if (scale->opts) {
AVDictionaryEntry *e = NULL;
while ((e = av_dict_get(scale->opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
if ((ret = av_opt_set(*s, e->key, e->value, 0)) < 0)
return ret;
}
}
/* Override YUV420P default settings to have the correct (MPEG-2) chroma positions
* MPEG-2 chroma positions are used by convention
* XXX: support other 4:2:0 pixel formats */
if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) {
scale->in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}
if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) {
scale->out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}
av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
av_opt_set_int(*s, "src_v_chr_pos", scale->in_v_chr_pos, 0);
av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
av_opt_set_int(*s, "dst_v_chr_pos", scale->out_v_chr_pos, 0);
if ((ret = sws_init_context(*s, NULL, NULL)) < 0)
return ret;
if (!scale->interlaced)
break;
}
}
if (inlink->sample_aspect_ratio.num){
outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink->w, outlink->w * inlink->h}, inlink->sample_aspect_ratio);
} else
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d fmt:%s sar:%d/%d flags:0x%0x\n",
inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
scale->flags);
return 0;
fail:
av_log(NULL, AV_LOG_ERROR,
"Error when evaluating the expression '%s'.\n"
"Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
expr, scale->w_expr, scale->h_expr);
return ret;
}
static int config_props_ref(AVFilterLink *outlink)
{
AVFilterLink *inlink = outlink->src->inputs[1];
outlink->w = inlink->w;
outlink->h = inlink->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->time_base = inlink->time_base;
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
return ff_request_frame(outlink->src->inputs[0]);
}
static int request_frame_ref(AVFilterLink *outlink)
{
return ff_request_frame(outlink->src->inputs[1]);
}
static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)
{
ScaleContext *scale = link->dst->priv;
const uint8_t *in[4];
uint8_t *out[4];
int in_stride[4],out_stride[4];
int i;
for(i=0; i<4; i++){
int vsub= ((i+1)&2) ? scale->vsub : 0;
in_stride[i] = cur_pic->linesize[i] * mul;
out_stride[i] = out_buf->linesize[i] * mul;
in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];
out[i] = out_buf->data[i] + field * out_buf->linesize[i];
}
if(scale->input_is_pal)
in[1] = cur_pic->data[1];
if(scale->output_is_pal)
out[1] = out_buf->data[1];
return sws_scale(sws, in, in_stride, y/mul, h,
out,out_stride);
}
static int filter_frame(AVFilterLink *link, AVFrame *in)
{
ScaleContext *scale = link->dst->priv;
AVFilterLink *outlink = link->dst->outputs[0];
AVFrame *out;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
char buf[32];
int in_range;
if (av_frame_get_colorspace(in) == AVCOL_SPC_YCGCO)
av_log(link->dst, AV_LOG_WARNING, "Detected unsupported YCgCo colorspace.\n");
if( in->width != link->w
|| in->height != link->h
|| in->format != link->format
|| in->sample_aspect_ratio.den != link->sample_aspect_ratio.den || in->sample_aspect_ratio.num != link->sample_aspect_ratio.num) {
int ret;
if (scale->eval_mode == EVAL_MODE_INIT) {
snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
av_opt_set(scale, "w", buf, 0);
snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
av_opt_set(scale, "h", buf, 0);
}
link->dst->inputs[0]->format = in->format;
link->dst->inputs[0]->w = in->width;
link->dst->inputs[0]->h = in->height;
link->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
link->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
if ((ret = config_props(outlink)) < 0)
return ret;
}
if (!scale->sws)
return ff_filter_frame(outlink, in);
scale->hsub = desc->log2_chroma_w;
scale->vsub = desc->log2_chroma_h;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
out->width = outlink->w;
out->height = outlink->h;
if(scale->output_is_pal)
avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
in_range = av_frame_get_color_range(in);
if ( scale->in_color_matrix
|| scale->out_color_matrix
|| scale-> in_range != AVCOL_RANGE_UNSPECIFIED
|| in_range != AVCOL_RANGE_UNSPECIFIED
|| scale->out_range != AVCOL_RANGE_UNSPECIFIED) {
int in_full, out_full, brightness, contrast, saturation;
const int *inv_table, *table;
sws_getColorspaceDetails(scale->sws, (int **)&inv_table, &in_full,
(int **)&table, &out_full,
&brightness, &contrast, &saturation);
if (scale->in_color_matrix)
inv_table = parse_yuv_type(scale->in_color_matrix, av_frame_get_colorspace(in));
if (scale->out_color_matrix)
table = parse_yuv_type(scale->out_color_matrix, AVCOL_SPC_UNSPECIFIED);
else if (scale->in_color_matrix)
table = inv_table;
if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)
in_full = (scale-> in_range == AVCOL_RANGE_JPEG);
else if (in_range != AVCOL_RANGE_UNSPECIFIED)
in_full = (in_range == AVCOL_RANGE_JPEG);
if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
out_full = (scale->out_range == AVCOL_RANGE_JPEG);
sws_setColorspaceDetails(scale->sws, inv_table, in_full,
table, out_full,
brightness, contrast, saturation);
if (scale->isws[0])
sws_setColorspaceDetails(scale->isws[0], inv_table, in_full,
table, out_full,
brightness, contrast, saturation);
if (scale->isws[1])
sws_setColorspaceDetails(scale->isws[1], inv_table, in_full,
table, out_full,
brightness, contrast, saturation);
av_frame_set_color_range(out, out_full ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG);
}
av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
(int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
(int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
INT_MAX);
if(scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)){
scale_slice(link, out, in, scale->isws[0], 0, (link->h+1)/2, 2, 0);
scale_slice(link, out, in, scale->isws[1], 0, link->h /2, 2, 1);
}else if (scale->nb_slices) {
int i, slice_h, slice_start, slice_end = 0;
const int nb_slices = FFMIN(scale->nb_slices, link->h);
for (i = 0; i < nb_slices; i++) {
slice_start = slice_end;
slice_end = (link->h * (i+1)) / nb_slices;
slice_h = slice_end - slice_start;
scale_slice(link, out, in, scale->sws, slice_start, slice_h, 1, 0);
}
}else{
scale_slice(link, out, in, scale->sws, 0, link->h, 1, 0);
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int filter_frame_ref(AVFilterLink *link, AVFrame *in)
{
AVFilterLink *outlink = link->dst->outputs[1];
return ff_filter_frame(outlink, in);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
ScaleContext *scale = ctx->priv;
int ret;
if ( !strcmp(cmd, "width") || !strcmp(cmd, "w")
|| !strcmp(cmd, "height") || !strcmp(cmd, "h")) {
int old_w = scale->w;
int old_h = scale->h;
AVFilterLink *outlink = ctx->outputs[0];
av_opt_set(scale, cmd, args, 0);
if ((ret = config_props(outlink)) < 0) {
scale->w = old_w;
scale->h = old_h;
}
} else
ret = AVERROR(ENOSYS);
return ret;
}
static const AVClass *child_class_next(const AVClass *prev)
{
return prev ? NULL : sws_get_class();
}
#define OFFSET(x) offsetof(ScaleContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption scale_options[] = {
{ "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "height","Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },
{ "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_BOOL, {.i64 = 0 }, -1, 1, FLAGS },
{ "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
{ "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
{ "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_STRING, { .str = "auto" }, .flags = FLAGS },
{ "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
{ "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
{ "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
{ "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
{ "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
{ "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
{ "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
{ "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
{ "in_v_chr_pos", "input vertical chroma position in luma grid/256" , OFFSET(in_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "in_h_chr_pos", "input horizontal chroma position in luma grid/256", OFFSET(in_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "out_v_chr_pos", "output vertical chroma position in luma grid/256" , OFFSET(out_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "out_h_chr_pos", "output horizontal chroma position in luma grid/256", OFFSET(out_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "force_original_aspect_ratio", "decrease or increase w/h if necessary to keep the original AR", OFFSET(force_original_aspect_ratio), AV_OPT_TYPE_INT, { .i64 = 0}, 0, 2, FLAGS, "force_oar" },
{ "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "force_oar" },
{ "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },
{ "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },
{ "param0", "Scaler param 0", OFFSET(param[0]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
{ "param1", "Scaler param 1", OFFSET(param[1]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
{ "nb_slices", "set the number of slices (debug purpose only)", OFFSET(nb_slices), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{ NULL }
};
static const AVClass scale_class = {
.class_name = "scale",
.item_name = av_default_item_name,
.option = scale_options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER,
.child_class_next = child_class_next,
};
static const AVFilterPad avfilter_vf_scale_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_scale_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
},
{ NULL }
};
AVFilter ff_vf_scale = {
.name = "scale",
.description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format."),
.init_dict = init_dict,
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(ScaleContext),
.priv_class = &scale_class,
.inputs = avfilter_vf_scale_inputs,
.outputs = avfilter_vf_scale_outputs,
.process_command = process_command,
};
static const AVClass scale2ref_class = {
.class_name = "scale2ref",
.item_name = av_default_item_name,
.option = scale_options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER,
.child_class_next = child_class_next,
};
static const AVFilterPad avfilter_vf_scale2ref_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{
.name = "ref",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame_ref,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_scale2ref_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.request_frame= request_frame,
},
{
.name = "ref",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props_ref,
.request_frame= request_frame_ref,
},
{ NULL }
};
AVFilter ff_vf_scale2ref = {
.name = "scale2ref",
.description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format to the given reference."),
.init_dict = init_dict,
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(ScaleContext),
.priv_class = &scale2ref_class,
.inputs = avfilter_vf_scale2ref_inputs,
.outputs = avfilter_vf_scale2ref_outputs,
.process_command = process_command,
};
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