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mpv/video/sws_utils.c
wm4 8a9b64329c Relicense some non-MPlayer source files to LGPL 2.1 or later
This covers source files which were added in mplayer2 and mpv times
only, and where all code is covered by LGPL relicensing agreements.

There are probably more files to which this applies, but I'm being
conservative here.

A file named ao_sdl.c exists in MPlayer too, but the mpv one is a
complete rewrite, and was added some time after the original ao_sdl.c
was removed. The same applies to vo_sdl.c, for which the SDL2 API is
radically different in addition (MPlayer supports SDL 1.2 only).

common.c contains only code written by me. But common.h is a strange
case: although it originally was named mp_common.h and exists in MPlayer
too, by now it contains only definitions written by uau and me. The
exceptions are the CONTROL_ defines - thus not changing the license of
common.h yet.

codec_tags.c contained once large tables generated from MPlayer's
codecs.conf, but all of these tables were removed.

From demux_playlist.c I'm removing a code fragment from someone who was
not asked; this probably could be done later (see commit 15dccc37).

misc.c is a bit complicated to reason about (it was split off mplayer.c
and thus contains random functions out of this file), but actually all
functions have been added post-MPlayer. Except get_relative_time(),
which was written by uau, but looks similar to 3 different versions of
something similar in each of the Unix/win32/OSX timer source files. I'm
not sure what that means in regards to copyright, so I've just moved it
into another still-GPL source file for now.

screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but
they're all gone.
2016-01-19 18:36:06 +01:00

358 lines
12 KiB
C

/*
* 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_option.h"
#include "video/mp_image.h"
#include "video/img_format.h"
#include "fmt-conversion.h"
#include "csputils.h"
#include "common/msg.h"
#include "video/filter/vf.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 sws_opts *opts)
{
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;
}
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->colorspace);
int s_range = src->colorlevels == MP_CSP_LEVELS_PC;
int d_csp = mp_csp_to_sws_colorspace(dst->colorspace);
int d_range = dst->colorlevels == 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 HAVE_AVCODEC_CHROMA_POS_API
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;
}
int mp_sws_get_vf_equalizer(struct mp_sws_context *sws, struct vf_seteq *eq)
{
if (!sws->supports_csp)
return 0;
if (!strcmp(eq->item, "brightness"))
eq->value = ((sws->brightness * 100) + (1 << 15)) >> 16;
else if (!strcmp(eq->item, "contrast"))
eq->value = (((sws->contrast * 100) + (1 << 15)) >> 16) - 100;
else if (!strcmp(eq->item, "saturation"))
eq->value = (((sws->saturation * 100) + (1 << 15)) >> 16) - 100;
else
return 0;
return 1;
}
int mp_sws_set_vf_equalizer(struct mp_sws_context *sws, struct vf_seteq *eq)
{
if (!sws->supports_csp)
return 0;
if (!strcmp(eq->item, "brightness"))
sws->brightness = ((eq->value << 16) + 50) / 100;
else if (!strcmp(eq->item, "contrast"))
sws->contrast = MPMAX(1, (((eq->value + 100) << 16) + 50) / 100);
else if (!strcmp(eq->item, "saturation"))
sws->saturation = (((eq->value + 100) << 16) + 50) / 100;
else
return 0;
return mp_sws_reinit(sws) >= 0 ? 1 : -1;
}
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