mpv/video/sws_utils.c

465 lines
15 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_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"
#if HAVE_ZIMG
#include "zimg.h"
#endif
//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;
int fast;
int bitexact;
int zimg;
};
#define OPT_BASE_STRUCT struct sws_opts
const struct m_sub_options sws_conf = {
.opts = (const m_option_t[]) {
{"scaler", OPT_CHOICE(scaler,
{"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})},
{"lgb", OPT_FLOAT(lum_gblur), M_RANGE(0, 100.0)},
{"cgb", OPT_FLOAT(chr_gblur), M_RANGE(0, 100.0)},
{"cvs", OPT_INT(chr_vshift)},
{"chs", OPT_INT(chr_hshift)},
{"ls", OPT_FLOAT(lum_sharpen), M_RANGE(-100.0, 100.0)},
{"cs", OPT_FLOAT(chr_sharpen), M_RANGE(-100.0, 100.0)},
{"fast", OPT_FLAG(fast)},
{"bitexact", OPT_FLAG(bitexact)},
{"allow-zimg", OPT_FLAG(zimg)},
{0}
},
.size = sizeof(struct sws_opts),
.defaults = &(const struct sws_opts){
.scaler = SWS_LANCZOS,
.zimg = 1,
},
};
// Highest quality, but also slowest.
static const int mp_sws_hq_flags = SWS_FULL_CHR_H_INT | SWS_FULL_CHR_H_INP |
SWS_ACCURATE_RND;
// Fast, lossy.
const int mp_sws_fast_flags = SWS_BILINEAR;
// Set ctx parameters to global command line flags.
static void mp_sws_update_from_cmdline(struct mp_sws_context *ctx)
{
m_config_cache_update(ctx->opts_cache);
struct sws_opts *opts = ctx->opts_cache->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;
if (!opts->fast)
ctx->flags |= mp_sws_hq_flags;
if (opts->bitexact)
ctx->flags |= SWS_BITEXACT;
ctx->allow_zimg = opts->zimg;
}
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 bool allow_zimg(struct mp_sws_context *ctx)
{
return ctx->force_scaler == MP_SWS_ZIMG ||
(ctx->force_scaler == MP_SWS_AUTO && ctx->allow_zimg);
}
static bool allow_sws(struct mp_sws_context *ctx)
{
return ctx->force_scaler == MP_SWS_SWS || ctx->force_scaler == MP_SWS_AUTO;
}
bool mp_sws_supports_formats(struct mp_sws_context *ctx,
int imgfmt_out, int imgfmt_in)
{
#if HAVE_ZIMG
if (allow_zimg(ctx)) {
if (mp_zimg_supports_in_format(imgfmt_in) &&
mp_zimg_supports_out_format(imgfmt_out))
return true;
}
#endif
return allow_sws(ctx) &&
sws_isSupportedInput(imgfmt2pixfmt(imgfmt_in)) &&
sws_isSupportedOutput(imgfmt2pixfmt(imgfmt_out));
}
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->allow_zimg == old->allow_zimg &&
ctx->force_scaler == old->force_scaler &&
(!ctx->opts_cache || !m_config_cache_update(ctx->opts_cache));
}
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);
TA_FREEP(&ctx->aligned_src);
TA_FREEP(&ctx->aligned_dst);
}
// 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,
.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);
#if HAVE_ZIMG
ctx->zimg = mp_zimg_alloc();
talloc_steal(ctx, ctx->zimg);
#endif
return ctx;
}
// Enable auto-update of parameters from command line. Don't try to set custom
// options (other than possibly .src/.dst), because they might be overwritten
// if the user changes any options.
void mp_sws_enable_cmdline_opts(struct mp_sws_context *ctx, struct mpv_global *g)
{
if (ctx->opts_cache)
return;
ctx->opts_cache = m_config_cache_alloc(ctx, g, &sws_conf);
ctx->force_reload = true;
mp_sws_update_from_cmdline(ctx);
#if HAVE_ZIMG
mp_zimg_enable_cmdline_opts(ctx->zimg, g);
#endif
}
// 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;
if (cache_valid(ctx))
return 0;
if (ctx->opts_cache)
mp_sws_update_from_cmdline(ctx);
sws_freeContext(ctx->sws);
ctx->sws = NULL;
ctx->zimg_ok = false;
TA_FREEP(&ctx->aligned_src);
TA_FREEP(&ctx->aligned_dst);
#if HAVE_ZIMG
if (allow_zimg(ctx)) {
ctx->zimg->log = ctx->log;
ctx->zimg->src = src;
ctx->zimg->dst = dst;
if (ctx->zimg_opts)
ctx->zimg->opts = *ctx->zimg_opts;
if (mp_zimg_config(ctx->zimg)) {
ctx->zimg_ok = true;
MP_VERBOSE(ctx, "Using zimg.\n");
goto success;
}
MP_WARN(ctx, "Not using zimg, falling back to swscale.\n");
}
#endif
if (!allow_sws(ctx)) {
MP_ERR(ctx, "No scaler.\n");
return -1;
}
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);
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;
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);
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);
}
// 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,
0, 1 << 16, 1 << 16);
ctx->supports_csp = r >= 0;
if (sws_init_context(ctx->sws, ctx->src_filter, ctx->dst_filter) < 0)
return -1;
success:
ctx->force_reload = false;
*ctx->cached = *ctx;
return 1;
}
static struct mp_image *check_alignment(struct mp_log *log,
struct mp_image **alloc,
struct mp_image *img)
{
// It's completely unclear which alignment libswscale wants (for performance)
// or requires (for avoiding crashes and memory corruption).
// Is it av_cpu_max_align()? Is it the hardcoded AVFrame "default" of 32
// in get_video_buffer()? Is it whatever avcodec_align_dimensions2()
// determines? It's like you can't win if you try to prevent libswscale from
// corrupting memory...
// So use 32, a value that has been experimentally determined to be safe,
// and which in most cases is not larger than decoder output. It is smaller
// or equal to what most image allocators in mpv/ffmpeg use.
size_t align = 32;
assert(align <= MP_IMAGE_BYTE_ALIGN); // or mp_image_alloc will not cut it
bool is_aligned = true;
for (int p = 0; p < img->num_planes; p++) {
is_aligned &= MP_IS_ALIGNED((uintptr_t)img->planes[p], align);
is_aligned &= MP_IS_ALIGNED(labs(img->stride[p]), align);
}
if (is_aligned)
return img;
if (!*alloc) {
mp_verbose(log, "unaligned libswscale parameter; using slow copy.\n");
*alloc = mp_image_alloc(img->imgfmt, img->w, img->h);
if (!*alloc)
return NULL;
}
mp_image_copy_attributes(*alloc, img);
return *alloc;
}
// 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;
}
#if HAVE_ZIMG
if (ctx->zimg_ok)
return mp_zimg_convert(ctx->zimg, dst, src) ? 0 : -1;
#endif
struct mp_image *a_src = check_alignment(ctx->log, &ctx->aligned_src, src);
struct mp_image *a_dst = check_alignment(ctx->log, &ctx->aligned_dst, dst);
if (!a_src || !a_dst) {
MP_ERR(ctx, "image allocation failed.\n");
return -1;
}
if (a_src != src)
mp_image_copy(a_src, src);
sws_scale(ctx->sws, (const uint8_t *const *) a_src->planes, a_src->stride,
0, a_src->h, a_dst->planes, a_dst->stride);
if (a_dst != dst)
mp_image_copy(dst, a_dst);
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 = SWS_LANCZOS | 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 avfmt = imgfmt2pixfmt(img->imgfmt);
int to = AV_PIX_FMT_NONE;
for (int n = 0; endian_swaps[n][0] != AV_PIX_FMT_NONE; n++) {
if (endian_swaps[n][0] == avfmt)
to = endian_swaps[n][1];
}
if (to == AV_PIX_FMT_NONE || !mp_image_make_writeable(img))
return img;
int elems = img->fmt.bpp[0] / 8 / 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