mirror of https://github.com/mpv-player/mpv
308 lines
10 KiB
C
308 lines
10 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <assert.h>
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#include <libswscale/swscale.h>
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#include <libavcodec/avcodec.h>
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#include <libavutil/opt.h>
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#include "sws_utils.h"
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#include "video/mp_image.h"
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#include "video/img_format.h"
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#include "fmt-conversion.h"
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#include "csputils.h"
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#include "mpvcore/mp_msg.h"
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//global sws_flags from the command line
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int sws_flags = 2;
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float sws_lum_gblur = 0.0;
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float sws_chr_gblur = 0.0;
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int sws_chr_vshift = 0;
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int sws_chr_hshift = 0;
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float sws_chr_sharpen = 0.0;
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float sws_lum_sharpen = 0.0;
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// Highest quality, but also slowest.
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const int mp_sws_hq_flags = SWS_LANCZOS | SWS_FULL_CHR_H_INT |
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SWS_FULL_CHR_H_INP | SWS_ACCURATE_RND |
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SWS_BITEXACT;
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// Fast, lossy.
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const int mp_sws_fast_flags = SWS_BILINEAR;
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// Set ctx parameters to global command line flags.
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void mp_sws_set_from_cmdline(struct mp_sws_context *ctx)
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{
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sws_freeFilter(ctx->src_filter);
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ctx->src_filter = sws_getDefaultFilter(sws_lum_gblur, sws_chr_gblur,
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sws_lum_sharpen, sws_chr_sharpen,
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sws_chr_hshift, sws_chr_vshift, 0);
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ctx->force_reload = true;
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ctx->flags = SWS_PRINT_INFO;
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switch (sws_flags) {
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case 0: ctx->flags |= SWS_FAST_BILINEAR; break;
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case 1: ctx->flags |= SWS_BILINEAR; break;
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case 2: ctx->flags |= SWS_BICUBIC; break;
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case 3: ctx->flags |= SWS_X; break;
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case 4: ctx->flags |= SWS_POINT; break;
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case 5: ctx->flags |= SWS_AREA; break;
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case 6: ctx->flags |= SWS_BICUBLIN; break;
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case 7: ctx->flags |= SWS_GAUSS; break;
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case 8: ctx->flags |= SWS_SINC; break;
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case 9: ctx->flags |= SWS_LANCZOS; break;
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case 10: ctx->flags |= SWS_SPLINE; break;
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default: ctx->flags |= SWS_BILINEAR; break;
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}
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}
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bool mp_sws_supported_format(int imgfmt)
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{
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enum PixelFormat av_format = imgfmt2pixfmt(imgfmt);
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return av_format != PIX_FMT_NONE && sws_isSupportedInput(av_format)
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&& sws_isSupportedOutput(av_format);
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}
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static int mp_csp_to_sws_colorspace(enum mp_csp csp)
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{
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switch (csp) {
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case MP_CSP_BT_601: return SWS_CS_ITU601;
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case MP_CSP_BT_709: return SWS_CS_ITU709;
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case MP_CSP_SMPTE_240M: return SWS_CS_SMPTE240M;
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default: return SWS_CS_DEFAULT;
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}
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}
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// component_offset[]: byte index of each r (0), g (1), b (2), a (3) component
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static void planarize32(struct mp_image *dst, struct mp_image *src,
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int component_offset[4])
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{
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for (int y = 0; y < dst->h; y++) {
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for (int p = 0; p < 3; p++) {
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uint8_t *d_line = dst->planes[p] + y * dst->stride[p];
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uint8_t *s_line = src->planes[0] + y * src->stride[0];
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s_line += component_offset[(p + 1) % 3]; // GBR => RGB
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for (int x = 0; x < dst->w; x++) {
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d_line[x] = s_line[x * 4];
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}
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}
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}
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}
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#define SET_COMPS(comp, r, g, b, a) \
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{ (comp)[0] = (r); (comp)[1] = (g); (comp)[2] = (b); (comp)[3] = (a); }
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static int to_gbrp(struct mp_image *dst, struct mp_image *src,
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int my_sws_flags)
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{
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struct mp_image *temp = NULL;
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int comp[4];
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switch (src->imgfmt) {
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case IMGFMT_ABGR: SET_COMPS(comp, 3, 2, 1, 0); break;
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case IMGFMT_BGRA: SET_COMPS(comp, 2, 1, 0, 3); break;
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case IMGFMT_ARGB: SET_COMPS(comp, 1, 2, 3, 0); break;
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case IMGFMT_RGBA: SET_COMPS(comp, 0, 1, 2, 3); break;
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default:
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temp = mp_image_alloc(IMGFMT_RGBA, dst->w, dst->h);
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mp_image_swscale(temp, src, my_sws_flags);
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src = temp;
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SET_COMPS(comp, 0, 1, 2, 3);
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}
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planarize32(dst, src, comp);
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talloc_free(temp);
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return 0;
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}
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static bool cache_valid(struct mp_sws_context *ctx)
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{
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struct mp_sws_context *old = ctx->cached;
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if (ctx->force_reload)
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return false;
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return mp_image_params_equals(&ctx->src, &old->src) &&
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mp_image_params_equals(&ctx->dst, &old->dst) &&
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ctx->flags == old->flags &&
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ctx->brightness == old->brightness &&
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ctx->contrast == old->contrast &&
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ctx->saturation == old->saturation;
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}
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static int free_mp_sws(void *p)
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{
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struct mp_sws_context *ctx = p;
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sws_freeContext(ctx->sws);
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sws_freeFilter(ctx->src_filter);
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sws_freeFilter(ctx->dst_filter);
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return 0;
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}
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// You're supposed to set your scaling parameters on the returned context.
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// Free the context with talloc_free().
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struct mp_sws_context *mp_sws_alloc(void *talloc_parent)
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{
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struct mp_sws_context *ctx = talloc_ptrtype(talloc_parent, ctx);
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*ctx = (struct mp_sws_context) {
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.flags = SWS_BILINEAR,
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.contrast = 1 << 16, // 1.0 in 16.16 fixed point
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.saturation = 1 << 16,
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.force_reload = true,
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.params = {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT},
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.cached = talloc_zero(ctx, struct mp_sws_context),
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};
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talloc_set_destructor(ctx, free_mp_sws);
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return ctx;
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}
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// Reinitialize (if needed) - return error code.
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// Optional, but possibly useful to avoid having to handle mp_sws_scale errors.
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int mp_sws_reinit(struct mp_sws_context *ctx)
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{
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if (cache_valid(ctx))
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return 0;
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sws_freeContext(ctx->sws);
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ctx->sws = sws_alloc_context();
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if (!ctx->sws)
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return -1;
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struct mp_image_params *src = &ctx->src;
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struct mp_image_params *dst = &ctx->dst;
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mp_image_params_guess_csp(src); // sanitize colorspace/colorlevels
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mp_image_params_guess_csp(dst);
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struct mp_imgfmt_desc src_fmt = mp_imgfmt_get_desc(src->imgfmt);
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struct mp_imgfmt_desc dst_fmt = mp_imgfmt_get_desc(dst->imgfmt);
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if (!src_fmt.id || !dst_fmt.id)
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return -1;
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enum PixelFormat s_fmt = imgfmt2pixfmt(src->imgfmt);
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if (s_fmt == PIX_FMT_NONE || sws_isSupportedInput(s_fmt) < 1)
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return -1;
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enum PixelFormat d_fmt = imgfmt2pixfmt(dst->imgfmt);
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if (d_fmt == PIX_FMT_NONE || sws_isSupportedOutput(d_fmt) < 1)
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return -1;
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int s_csp = mp_csp_to_sws_colorspace(src->colorspace);
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int s_range = src->colorlevels == MP_CSP_LEVELS_PC;
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int d_csp = mp_csp_to_sws_colorspace(dst->colorspace);
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int d_range = dst->colorlevels == MP_CSP_LEVELS_PC;
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// Work around libswscale bug #1852 (fixed in ffmpeg commit 8edf9b1fa):
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// setting range flags for RGB gives random bogus results.
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// Newer libswscale always ignores range flags for RGB.
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s_range = s_range && (src_fmt.flags & MP_IMGFLAG_YUV);
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d_range = d_range && (dst_fmt.flags & MP_IMGFLAG_YUV);
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av_opt_set_int(ctx->sws, "sws_flags", ctx->flags, 0);
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av_opt_set_int(ctx->sws, "srcw", src->w, 0);
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av_opt_set_int(ctx->sws, "srch", src->h, 0);
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av_opt_set_int(ctx->sws, "src_format", s_fmt, 0);
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av_opt_set_int(ctx->sws, "dstw", dst->w, 0);
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av_opt_set_int(ctx->sws, "dsth", dst->h, 0);
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av_opt_set_int(ctx->sws, "dst_format", d_fmt, 0);
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av_opt_set_double(ctx->sws, "param0", ctx->params[0], 0);
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av_opt_set_double(ctx->sws, "param1", ctx->params[1], 0);
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#if HAVE_AVCODEC_CHROMA_POS_API
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int cr_src = mp_chroma_location_to_av(src->chroma_location);
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int cr_dst = mp_chroma_location_to_av(dst->chroma_location);
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int cr_xpos, cr_ypos;
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if (avcodec_enum_to_chroma_pos(&cr_xpos, &cr_ypos, cr_src) >= 0) {
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av_opt_set_int(ctx->sws, "src_h_chr_pos", cr_xpos, 0);
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av_opt_set_int(ctx->sws, "src_v_chr_pos", cr_ypos, 0);
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}
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if (avcodec_enum_to_chroma_pos(&cr_xpos, &cr_ypos, cr_dst) >= 0) {
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av_opt_set_int(ctx->sws, "dst_h_chr_pos", cr_xpos, 0);
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av_opt_set_int(ctx->sws, "dst_v_chr_pos", cr_ypos, 0);
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}
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#endif
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// This can fail even with normal operation, e.g. if a conversion path
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// simply does not support these settings.
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sws_setColorspaceDetails(ctx->sws, sws_getCoefficients(s_csp), s_range,
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sws_getCoefficients(d_csp), d_range,
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ctx->brightness, ctx->contrast, ctx->saturation);
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if (sws_init_context(ctx->sws, ctx->src_filter, ctx->dst_filter) < 0)
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return -1;
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ctx->force_reload = false;
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*ctx->cached = *ctx;
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return 1;
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}
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// Scale from src to dst - if src/dst have different parameters from previous
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// calls, the context is reinitialized. Return error code. (It can fail if
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// reinitialization was necessary, and swscale returned an error.)
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int mp_sws_scale(struct mp_sws_context *ctx, struct mp_image *dst,
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struct mp_image *src)
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{
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// Hack for older swscale versions which don't support this.
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// We absolutely need this in the OSD rendering path.
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if (dst->imgfmt == IMGFMT_GBRP && !sws_isSupportedOutput(PIX_FMT_GBRP))
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return to_gbrp(dst, src, ctx->flags);
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mp_image_params_from_image(&ctx->src, src);
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mp_image_params_from_image(&ctx->dst, dst);
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int r = mp_sws_reinit(ctx);
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if (r < 0) {
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mp_msg(MSGT_VFILTER, MSGL_ERR, "libswscale initialization failed.\n");
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return r;
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}
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sws_scale(ctx->sws, (const uint8_t *const *) src->planes, src->stride,
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0, src->h, dst->planes, dst->stride);
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return 0;
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}
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void mp_image_swscale(struct mp_image *dst, struct mp_image *src,
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int my_sws_flags)
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{
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struct mp_sws_context *ctx = mp_sws_alloc(NULL);
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ctx->flags = my_sws_flags;
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mp_sws_scale(ctx, dst, src);
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talloc_free(ctx);
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}
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void mp_image_sw_blur_scale(struct mp_image *dst, struct mp_image *src,
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float gblur)
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{
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struct mp_sws_context *ctx = mp_sws_alloc(NULL);
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ctx->flags = mp_sws_hq_flags;
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ctx->src_filter = sws_getDefaultFilter(gblur, gblur, 0, 0, 0, 0, 0);
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ctx->force_reload = true;
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mp_sws_scale(ctx, dst, src);
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talloc_free(ctx);
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}
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// vim: ts=4 sw=4 et tw=80
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