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🎥 Command line media player
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#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 linestruct 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_optsconst 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->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