bool write_image(struct mp_image *image, const struct image_writer_opts *opts,
const char *filename, struct mp_log *log)
{
struct image_writer_opts defs = image_writer_opts_defaults;
if (!opts)
opts = &defs;
const struct img_writer *writer = get_writer(opts);
struct image_writer_ctx ctx = { log, opts, writer, image->fmt };
int destfmt = get_target_format(&ctx, image->imgfmt);
struct mp_image *dst = convert_image(image, destfmt, log);
if (!dst)
return false;
FILE *fp = fopen(filename, "wb");
bool success = false;
if (fp == NULL) {
mp_err(log, "Error opening '%s' for writing!\n", filename);
} else {
success = writer->write(&ctx, dst, fp);
success = !fclose(fp) && success;
if (!success)
mp_err(log, "Error writing file '%s'!\n", filename);
}
talloc_free(dst);
return success;
}
struct mp_image *convert_image(struct mp_image *image, int destfmt,
struct mp_log *log)
{
int d_w, d_h;
mp_image_params_get_dsize(&image->params, &d_w, &d_h);
struct mp_image_params p = {
.imgfmt = destfmt,
.w = d_w,
.h = d_h,
.p_w = 1,
.p_h = 1,
};
mp_image_params_guess_csp(&p);
// If RGB, just assume everything is correct.
if (p.color.space != MP_CSP_RGB) {
// Currently, assume what FFmpeg's jpg encoder needs.
// Of course this works only for non-HDR (no HDR support in libswscale).
p.color.levels = MP_CSP_LEVELS_PC;
p.color.space = MP_CSP_BT_601;
p.chroma_location = MP_CHROMA_CENTER;
mp_image_params_guess_csp(&p);
}
if (mp_image_params_equal(&p, &image->params))
return mp_image_new_ref(image);
struct mp_image *dst = mp_image_alloc(p.imgfmt, p.w, p.h);
if (!dst) {
mp_err(log, "Out of memory.\n");
return NULL;
}
mp_image_copy_attributes(dst, image);
dst->params = p;
if (mp_image_swscale(dst, image, mp_sws_hq_flags) < 0) {
mp_err(log, "Error when converting image.\n");
talloc_free(dst);
return NULL;
}
return dst;
}
bool write_image(struct mp_image *image, const struct image_writer_opts *opts,
const char *filename, struct mp_log *log)
{
struct image_writer_opts defs = image_writer_opts_defaults;
if (!opts)
opts = &defs;
struct image_writer_ctx ctx = { log, opts, image->fmt };
bool (*write)(struct image_writer_ctx *, mp_image_t *, FILE *) = write_lavc;
int destfmt = 0;
#if HAVE_JPEG
if (opts->format == AV_CODEC_ID_MJPEG) {
write = write_jpeg;
destfmt = IMGFMT_RGB24;
}
#endif
if (!destfmt)
destfmt = get_target_format(&ctx);
struct mp_image *dst = convert_image(image, destfmt, log);
if (!dst)
return false;
FILE *fp = fopen(filename, "wb");
bool success = false;
if (fp == NULL) {
mp_err(log, "Error opening '%s' for writing!\n", filename);
} else {
success = write(&ctx, dst, fp);
success = !fclose(fp) && success;
if (!success)
mp_err(log, "Error writing file '%s'!\n", filename);
}
talloc_free(dst);
return success;
}
void dump_png(struct mp_image *image, const char *filename, struct mp_log *log)
{
struct image_writer_opts opts = image_writer_opts_defaults;
opts.format = AV_CODEC_ID_PNG;
write_image(image, &opts, filename, log);
}