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#include "libmpv/render_gl.h"
#include "libmpv.h"
#include "sub/osd.h"
#include "video/sws_utils.h"
struct priv {
struct libmpv_gpu_context *context;
struct mp_sws_context *sws;
struct osd_state *osd;
struct mp_image_params src_params, dst_params;
struct mp_rect src_rc, dst_rc;
struct mp_osd_res osd_rc;
bool anything_changed;
};
static int init(struct render_backend *ctx, mpv_render_param *params)
{
ctx->priv = talloc_zero(NULL, struct priv);
struct priv *p = ctx->priv;
char *api = get_mpv_render_param(params, MPV_RENDER_PARAM_API_TYPE, NULL);
if (!api)
return MPV_ERROR_INVALID_PARAMETER;
if (strcmp(api, MPV_RENDER_API_TYPE_SW) != 0)
return MPV_ERROR_NOT_IMPLEMENTED;
p->sws = mp_sws_alloc(p);
mp_sws_enable_cmdline_opts(p->sws, ctx->global);
p->anything_changed = true;
return 0;
}
static bool check_format(struct render_backend *ctx, int imgfmt)
{
struct priv *p = ctx->priv;
// Note: we don't know the output format yet. Using an arbitrary supported
// format is fine, because we know that any supported input format can
// be converted to any supported output format.
return mp_sws_supports_formats(p->sws, IMGFMT_RGB0, imgfmt);
}
static int set_parameter(struct render_backend *ctx, mpv_render_param param)
{
return MPV_ERROR_NOT_IMPLEMENTED;
}
static void reconfig(struct render_backend *ctx, struct mp_image_params *params)
{
struct priv *p = ctx->priv;
p->src_params = *params;
p->anything_changed = true;
}
static void reset(struct render_backend *ctx)
{
// stateless
}
static void update_external(struct render_backend *ctx, struct vo *vo)
{
struct priv *p = ctx->priv;
p->osd = vo ? vo->osd : NULL;
}
static void resize(struct render_backend *ctx, struct mp_rect *src,
struct mp_rect *dst, struct mp_osd_res *osd)
{
struct priv *p = ctx->priv;
p->src_rc = *src;
p->dst_rc = *dst;
p->osd_rc = *osd;
p->anything_changed = true;
}
static int get_target_size(struct render_backend *ctx, mpv_render_param *params,
int *out_w, int *out_h)
{
int *sz = get_mpv_render_param(params, MPV_RENDER_PARAM_SW_SIZE, NULL);
if (!sz)
return MPV_ERROR_INVALID_PARAMETER;
*out_w = sz[0];
*out_h = sz[1];
return 0;
}
static int render(struct render_backend *ctx, mpv_render_param *params,
struct vo_frame *frame)
{
struct priv *p = ctx->priv;
int *sz = get_mpv_render_param(params, MPV_RENDER_PARAM_SW_SIZE, NULL);
char *fmt = get_mpv_render_param(params, MPV_RENDER_PARAM_SW_FORMAT, NULL);
size_t *stride = get_mpv_render_param(params, MPV_RENDER_PARAM_SW_STRIDE, NULL);
void *ptr = get_mpv_render_param(params, MPV_RENDER_PARAM_SW_POINTER, NULL);
if (!sz || !fmt || !stride || !ptr)
return MPV_ERROR_INVALID_PARAMETER;
char *prev_fmt = mp_imgfmt_to_name(p->dst_params.imgfmt);
if (strcmp(prev_fmt, fmt) != 0)
p->anything_changed = true;
if (sz[0] != p->dst_params.w || sz[1] != p->dst_params.h)
p->anything_changed = true;
if (p->anything_changed) {
p->dst_params = (struct mp_image_params){
.imgfmt = mp_imgfmt_from_name(bstr0(fmt)),
.w = sz[0],
.h = sz[1],
};
// Exclude "problematic" formats. In particular, reject multi-plane and
// hw formats. Exclude non-byte-aligned formats for easier stride
// checking.
struct mp_imgfmt_desc desc = mp_imgfmt_get_desc(p->dst_params.imgfmt);
if (!(desc.flags & MP_IMGFLAG_COLOR_RGB) ||
!(desc.flags & (MP_IMGFLAG_TYPE_UINT | MP_IMGFLAG_TYPE_FLOAT)) ||
(desc.flags & MP_IMGFLAG_TYPE_PAL8) ||
!(desc.flags & MP_IMGFLAG_BYTE_ALIGNED) ||
desc.num_planes != 1)
return MPV_ERROR_UNSUPPORTED;
mp_image_params_guess_csp(&p->dst_params);
// Can be unset if rendering before any video was loaded.
if (p->src_params.imgfmt) {
p->sws->src = p->src_params;
p->sws->src.w = mp_rect_w(p->src_rc);
p->sws->src.h = mp_rect_h(p->src_rc);
p->sws->dst = p->dst_params;
p->sws->dst.w = mp_rect_w(p->dst_rc);
p->sws->dst.h = mp_rect_h(p->dst_rc);
if (mp_sws_reinit(p->sws) < 0)
return MPV_ERROR_UNSUPPORTED; // probably
}
p->anything_changed = false;
}
struct mp_image wrap_img = {0};
mp_image_set_params(&wrap_img, &p->dst_params);
size_t bpp = wrap_img.fmt.bpp[0] / 8;
if (!bpp || bpp * wrap_img.w > *stride || *stride % bpp)
return MPV_ERROR_INVALID_PARAMETER;
wrap_img.planes[0] = ptr;
wrap_img.stride[0] = *stride;
struct mp_image *img = frame->current;
if (img) {
assert(p->src_params.imgfmt);
mp_image_clear_rc_inv(&wrap_img, p->dst_rc);
struct mp_image src = *img;
struct mp_rect src_rc = p->src_rc;
src_rc.x0 = MP_ALIGN_DOWN(src_rc.x0, src.fmt.align_x);
src_rc.y0 = MP_ALIGN_DOWN(src_rc.y0, src.fmt.align_y);
mp_image_crop_rc(&src, src_rc);
struct mp_image dst = wrap_img;
mp_image_crop_rc(&dst, p->dst_rc);
if (mp_sws_scale(p->sws, &dst, &src) < 0) {
mp_image_clear(&wrap_img, 0, 0, wrap_img.w, wrap_img.h);
return MPV_ERROR_GENERIC;
}
} else {
mp_image_clear(&wrap_img, 0, 0, wrap_img.w, wrap_img.h);
}
if (p->osd)
osd_draw_on_image(p->osd, p->osd_rc, img ? img->pts : 0, 0, &wrap_img);
return 0;
}
static void destroy(struct render_backend *ctx)
{
// nop
}
const struct render_backend_fns render_backend_sw = {
.init = init,
.check_format = check_format,
.set_parameter = set_parameter,
.reconfig = reconfig,
.reset = reset,
.update_external = update_external,
.resize = resize,
.get_target_size = get_target_size,
.render = render,
.destroy = destroy,
};
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