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-rw-r--r--video/sws_utils.c496
1 files changed, 496 insertions, 0 deletions
diff --git a/video/sws_utils.c b/video/sws_utils.c
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+++ b/video/sws_utils.c
@@ -0,0 +1,496 @@
+/*
+ * 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>
+#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(57, 37, 100)
+#include <libavutil/pixdesc.h>
+#endif
+
+#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;
+ bool fast;
+ bool bitexact;
+ bool 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_BOOL(fast)},
+ {"bitexact", OPT_BOOL(bitexact)},
+ {"allow-zimg", OPT_BOOL(zimg)},
+ {0}
+ },
+ .size = sizeof(struct sws_opts),
+ .defaults = &(const struct sws_opts){
+ .scaler = SWS_LANCZOS,
+ .zimg = true,
+ },
+};
+
+// 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);
+}
+
+#if HAVE_ZIMG
+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);
+}
+#endif
+
+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)
+{
+ // Should only ever be NULL for tests.
+ if (!g)
+ return;
+ 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 LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(57, 37, 100)
+ if (av_chroma_location_enum_to_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 (av_chroma_location_enum_to_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);
+ }
+#else
+ 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,
+ 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;
+
+#if HAVE_ZIMG
+success:
+#endif
+
+ 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
+
+ if (src->params.color.space == MP_CSP_XYZ && dst->params.color.space != MP_CSP_XYZ) {
+ // swsscale has hardcoded gamma 2.2 internally and 2.6 for XYZ
+ dst->params.color.gamma = MP_CSP_TRC_GAMMA22;
+ // and sRGB primaries...
+ dst->params.color.primaries = MP_CSP_PRIM_BT_709;
+ // it doesn't adjust white point though, but it is not worth to support
+ // this case. It would require custom prim with equal energy white point
+ // and sRGB primaries.
+ }
+
+ 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
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 03:20:33 +0000