mpv/video/sws_utils.c

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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <libswscale/swscale.h>
#include <libavcodec/avcodec.h>
#include <libavutil/bswap.h>
#include <libavutil/opt.h>
#include "config.h"
#include "sws_utils.h"
#include "common/common.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "video/mp_image.h"
#include "video/img_format.h"
#include "fmt-conversion.h"
#include "csputils.h"
#include "common/msg.h"
#include "osdep/endian.h"
//global sws_flags from the command line
struct sws_opts {
int scaler;
float lum_gblur;
float chr_gblur;
int chr_vshift;
int chr_hshift;
float chr_sharpen;
float lum_sharpen;
};
#define OPT_BASE_STRUCT struct sws_opts
const struct m_sub_options sws_conf = {
.opts = (const m_option_t[]) {
OPT_CHOICE("scaler", scaler, 0,
({"fast-bilinear", SWS_FAST_BILINEAR},
{"bilinear", SWS_BILINEAR},
{"bicubic", SWS_BICUBIC},
{"x", SWS_X},
{"point", SWS_POINT},
{"area", SWS_AREA},
{"bicublin", SWS_BICUBLIN},
{"gauss", SWS_GAUSS},
{"sinc", SWS_SINC},
{"lanczos", SWS_LANCZOS},
{"spline", SWS_SPLINE})),
OPT_FLOATRANGE("lgb", lum_gblur, 0, 0, 100.0),
OPT_FLOATRANGE("cgb", chr_gblur, 0, 0, 100.0),
OPT_INT("cvs", chr_vshift, 0),
OPT_INT("chs", chr_hshift, 0),
OPT_FLOATRANGE("ls", lum_sharpen, 0, -100.0, 100.0),
OPT_FLOATRANGE("cs", chr_sharpen, 0, -100.0, 100.0),
{0}
},
.size = sizeof(struct sws_opts),
.defaults = &(const struct sws_opts){
.scaler = SWS_BICUBIC,
},
};
// Highest quality, but also slowest.
const int mp_sws_hq_flags = SWS_LANCZOS | SWS_FULL_CHR_H_INT |
SWS_FULL_CHR_H_INP | SWS_ACCURATE_RND |
SWS_BITEXACT;
// Fast, lossy.
const int mp_sws_fast_flags = SWS_BILINEAR;
// Set ctx parameters to global command line flags.
void mp_sws_set_from_cmdline(struct mp_sws_context *ctx, struct mpv_global *g)
{
struct sws_opts *opts = mp_get_config_group(NULL, g, &sws_conf);
sws_freeFilter(ctx->src_filter);
ctx->src_filter = sws_getDefaultFilter(opts->lum_gblur, opts->chr_gblur,
opts->lum_sharpen, opts->chr_sharpen,
opts->chr_hshift, opts->chr_vshift, 0);
ctx->force_reload = true;
ctx->flags = SWS_PRINT_INFO;
ctx->flags |= opts->scaler;
talloc_free(opts);
}
bool mp_sws_supported_format(int imgfmt)
{
enum AVPixelFormat av_format = imgfmt2pixfmt(imgfmt);
return av_format != AV_PIX_FMT_NONE && sws_isSupportedInput(av_format)
&& sws_isSupportedOutput(av_format);
}
static int mp_csp_to_sws_colorspace(enum mp_csp csp)
{
// The SWS_CS_* macros are just convenience redefinitions of the
// AVCOL_SPC_* macros, inside swscale.h.
return mp_csp_to_avcol_spc(csp);
}
static bool cache_valid(struct mp_sws_context *ctx)
{
struct mp_sws_context *old = ctx->cached;
if (ctx->force_reload)
return false;
return mp_image_params_equal(&ctx->src, &old->src) &&
mp_image_params_equal(&ctx->dst, &old->dst) &&
ctx->flags == old->flags &&
ctx->brightness == old->brightness &&
ctx->contrast == old->contrast &&
ctx->saturation == old->saturation;
}
static void free_mp_sws(void *p)
{
struct mp_sws_context *ctx = p;
sws_freeContext(ctx->sws);
sws_freeFilter(ctx->src_filter);
sws_freeFilter(ctx->dst_filter);
}
// You're supposed to set your scaling parameters on the returned context.
// Free the context with talloc_free().
struct mp_sws_context *mp_sws_alloc(void *talloc_ctx)
{
struct mp_sws_context *ctx = talloc_ptrtype(talloc_ctx, ctx);
*ctx = (struct mp_sws_context) {
.log = mp_null_log,
.flags = SWS_BILINEAR,
.contrast = 1 << 16, // 1.0 in 16.16 fixed point
.saturation = 1 << 16,
.force_reload = true,
.params = {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT},
.cached = talloc_zero(ctx, struct mp_sws_context),
};
talloc_set_destructor(ctx, free_mp_sws);
return ctx;
}
// Reinitialize (if needed) - return error code.
// Optional, but possibly useful to avoid having to handle mp_sws_scale errors.
int mp_sws_reinit(struct mp_sws_context *ctx)
{
struct mp_image_params *src = &ctx->src;
struct mp_image_params *dst = &ctx->dst;
// Neutralize unsupported or ignored parameters.
src->p_w = dst->p_w = 0;
src->p_h = dst->p_h = 0;
if (cache_valid(ctx))
return 0;
sws_freeContext(ctx->sws);
ctx->sws = sws_alloc_context();
if (!ctx->sws)
return -1;
mp_image_params_guess_csp(src); // sanitize colorspace/colorlevels
mp_image_params_guess_csp(dst);
struct mp_imgfmt_desc src_fmt = mp_imgfmt_get_desc(src->imgfmt);
struct mp_imgfmt_desc dst_fmt = mp_imgfmt_get_desc(dst->imgfmt);
if (!src_fmt.id || !dst_fmt.id)
return -1;
enum AVPixelFormat s_fmt = imgfmt2pixfmt(src->imgfmt);
if (s_fmt == AV_PIX_FMT_NONE || sws_isSupportedInput(s_fmt) < 1) {
MP_ERR(ctx, "Input image format %s not supported by libswscale.\n",
mp_imgfmt_to_name(src->imgfmt));
return -1;
}
enum AVPixelFormat d_fmt = imgfmt2pixfmt(dst->imgfmt);
if (d_fmt == AV_PIX_FMT_NONE || sws_isSupportedOutput(d_fmt) < 1) {
MP_ERR(ctx, "Output image format %s not supported by libswscale.\n",
mp_imgfmt_to_name(dst->imgfmt));
return -1;
}
int s_csp = mp_csp_to_sws_colorspace(src->color.space);
int s_range = src->color.levels == MP_CSP_LEVELS_PC;
int d_csp = mp_csp_to_sws_colorspace(dst->color.space);
int d_range = dst->color.levels == MP_CSP_LEVELS_PC;
// Work around libswscale bug #1852 (fixed in ffmpeg commit 8edf9b1fa):
// setting range flags for RGB gives random bogus results.
// Newer libswscale always ignores range flags for RGB.
s_range = s_range && (src_fmt.flags & MP_IMGFLAG_YUV);
d_range = d_range && (dst_fmt.flags & MP_IMGFLAG_YUV);
av_opt_set_int(ctx->sws, "sws_flags", ctx->flags, 0);
av_opt_set_int(ctx->sws, "srcw", src->w, 0);
av_opt_set_int(ctx->sws, "srch", src->h, 0);
av_opt_set_int(ctx->sws, "src_format", s_fmt, 0);
av_opt_set_int(ctx->sws, "dstw", dst->w, 0);
av_opt_set_int(ctx->sws, "dsth", dst->h, 0);
av_opt_set_int(ctx->sws, "dst_format", d_fmt, 0);
av_opt_set_double(ctx->sws, "param0", ctx->params[0], 0);
av_opt_set_double(ctx->sws, "param1", ctx->params[1], 0);
#if LIBAVCODEC_VERSION_MICRO >= 100
int cr_src = mp_chroma_location_to_av(src->chroma_location);
int cr_dst = mp_chroma_location_to_av(dst->chroma_location);
int cr_xpos, cr_ypos;
if (avcodec_enum_to_chroma_pos(&cr_xpos, &cr_ypos, cr_src) >= 0) {
av_opt_set_int(ctx->sws, "src_h_chr_pos", cr_xpos, 0);
av_opt_set_int(ctx->sws, "src_v_chr_pos", cr_ypos, 0);
}
if (avcodec_enum_to_chroma_pos(&cr_xpos, &cr_ypos, cr_dst) >= 0) {
av_opt_set_int(ctx->sws, "dst_h_chr_pos", cr_xpos, 0);
av_opt_set_int(ctx->sws, "dst_v_chr_pos", cr_ypos, 0);
}
#endif
// This can fail even with normal operation, e.g. if a conversion path
// simply does not support these settings.
int r =
sws_setColorspaceDetails(ctx->sws, sws_getCoefficients(s_csp), s_range,
sws_getCoefficients(d_csp), d_range,
ctx->brightness, ctx->contrast, ctx->saturation);
ctx->supports_csp = r >= 0;
if (sws_init_context(ctx->sws, ctx->src_filter, ctx->dst_filter) < 0)
return -1;
ctx->force_reload = false;
*ctx->cached = *ctx;
return 1;
}
// Scale from src to dst - if src/dst have different parameters from previous
// calls, the context is reinitialized. Return error code. (It can fail if
// reinitialization was necessary, and swscale returned an error.)
int mp_sws_scale(struct mp_sws_context *ctx, struct mp_image *dst,
struct mp_image *src)
{
ctx->src = src->params;
ctx->dst = dst->params;
int r = mp_sws_reinit(ctx);
if (r < 0) {
MP_ERR(ctx, "libswscale initialization failed.\n");
return r;
}
sws_scale(ctx->sws, (const uint8_t *const *) src->planes, src->stride,
0, src->h, dst->planes, dst->stride);
return 0;
}
int mp_image_swscale(struct mp_image *dst, struct mp_image *src,
int my_sws_flags)
{
struct mp_sws_context *ctx = mp_sws_alloc(NULL);
ctx->flags = my_sws_flags;
int res = mp_sws_scale(ctx, dst, src);
talloc_free(ctx);
return res;
}
int mp_image_sw_blur_scale(struct mp_image *dst, struct mp_image *src,
float gblur)
{
struct mp_sws_context *ctx = mp_sws_alloc(NULL);
ctx->flags = mp_sws_hq_flags;
ctx->src_filter = sws_getDefaultFilter(gblur, gblur, 0, 0, 0, 0, 0);
ctx->force_reload = true;
int res = mp_sws_scale(ctx, dst, src);
talloc_free(ctx);
return res;
}
static const int endian_swaps[][2] = {
#if BYTE_ORDER == LITTLE_ENDIAN
#if defined(AV_PIX_FMT_YA16) && defined(AV_PIX_FMT_RGBA64)
{AV_PIX_FMT_YA16BE, AV_PIX_FMT_YA16LE},
{AV_PIX_FMT_RGBA64BE, AV_PIX_FMT_RGBA64LE},
{AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE},
{AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGB48LE},
#endif
#endif
{AV_PIX_FMT_NONE, AV_PIX_FMT_NONE}
};
// Swap _some_ non-native endian formats to native. We do this specifically
// for pixel formats used by PNG, to avoid going through libswscale, which
// might reduce the effective bit depth in some cases.
struct mp_image *mp_img_swap_to_native(struct mp_image *img)
{
int to = AV_PIX_FMT_NONE;
for (int n = 0; endian_swaps[n][0] != AV_PIX_FMT_NONE; n++) {
if (endian_swaps[n][0] == img->fmt.avformat)
to = endian_swaps[n][1];
}
if (to == AV_PIX_FMT_NONE || !mp_image_make_writeable(img))
return img;
int elems = img->fmt.bytes[0] / 2 * img->w;
for (int y = 0; y < img->h; y++) {
uint16_t *p = (uint16_t *)(img->planes[0] + y * img->stride[0]);
for (int i = 0; i < elems; i++)
p[i] = av_be2ne16(p[i]);
}
mp_image_setfmt(img, pixfmt2imgfmt(to));
return img;
}
// vim: ts=4 sw=4 et tw=80