image_writer: add option parsing

image_writer now provides its own option parsing, and screenshot.c and
the mplayer frontend use it.

cfg-mplayer.h

@@ -616,6 +616,14 @@ const m_option_t tvscan_conf[]={
 };
 #endif
 
+extern const struct m_sub_options image_writer_conf;
+
+const m_option_t screenshot_conf[] = {
+    OPT_SUBSTRUCT(screenshot_image_opts, image_writer_conf, M_OPT_MERGE),
+    OPT_STRING("template", screenshot_template, 0),
+    {0},
+};
+
 const m_option_t mplayer_opts[]={
     /* name, pointer, type, flags, min, max */
 
@@ -785,10 +793,8 @@ const m_option_t mplayer_opts[]={
     {"tvscan", (void *) tvscan_conf, CONF_TYPE_SUBCONFIG, 0, 0, 0, NULL},
 #endif /* CONFIG_TV */
 
-    OPT_INTRANGE("screenshot-jpeg-quality", screenshot_jpeg_quality, 0, 0, 100),
+    {"screenshot", (void *) screenshot_conf, CONF_TYPE_SUBCONFIG,
-    OPT_INTRANGE("screenshot-png-compression", screenshot_png_compression, 0, 0, 9),
+     M_OPT_PREFIXED, 0, 0, NULL},
-    OPT_STRING("screenshot-filetype", screenshot_filetype, 0),
-    OPT_STRING("screenshot-template", screenshot_template, 0),
 
     OPT_FLAG_ON("list-properties", list_properties, CONF_GLOBAL),
     {"identify", &mp_msg_levels[MSGT_IDENTIFY], CONF_TYPE_FLAG, CONF_GLOBAL, 0, MSGL_V, NULL},

defaultopts.c

@@ -40,8 +40,6 @@ void set_default_mplayer_options(struct MPOpts *opts)
         .video_id = -1,
         .sub_id = -1,
         .extension_parsing = 1,
-        .screenshot_jpeg_quality = 85,
-        .screenshot_png_compression = 7,
         .audio_output_channels = 2,
         .audio_output_format = -1,  // AF_FORMAT_UNKNOWN
         .playback_speed = 1.,

image_writer.c

@@ -51,6 +51,20 @@ const struct image_writer_opts image_writer_opts_defaults = {
     .jpeg_quality = 85,
 };
 
+#undef OPT_BASE_STRUCT
+#define OPT_BASE_STRUCT struct image_writer_opts
+
+const struct m_sub_options image_writer_conf = {
+    .opts = (m_option_t[]) {
+        OPT_INTRANGE("jpeg-quality", jpeg_quality, 0, 0, 100),
+        OPT_INTRANGE("png-compression", png_compression, 0, 0, 9),
+        OPT_STRING("filetype", filetype, 0),
+        {0},
+    },
+    .size = sizeof(struct image_writer_opts),
+    .defaults = &image_writer_opts_defaults,
+};
+
 struct image_writer_ctx {
     const struct image_writer_opts *opts;
     const struct img_writer *writer;

options.h

@@ -85,9 +85,7 @@ typedef struct MPOpts {
     char *sub_demuxer_name;
     int extension_parsing;
 
-    int screenshot_jpeg_quality;
+    struct image_writer_opts *screenshot_image_opts;
-    int screenshot_png_compression;
-    char *screenshot_filetype;
     char *screenshot_template;
 
     int audio_output_channels;

screenshot.c

@@ -262,15 +262,12 @@ void screenshot_save(struct MPContext *mpctx, struct mp_image *image)
     struct mp_csp_details colorspace;
     get_detected_video_colorspace(mpctx->sh_video, &colorspace);
 
-    struct image_writer_opts opts = image_writer_opts_defaults;
+    struct image_writer_opts *opts = mpctx->opts.screenshot_image_opts;
-    opts.filetype = mpctx->opts.screenshot_filetype;
-    opts.jpeg_quality = mpctx->opts.screenshot_jpeg_quality;
-    opts.png_compression = mpctx->opts.screenshot_png_compression;
 
-    char *filename = gen_fname(ctx, image_writer_file_ext(&opts));
+    char *filename = gen_fname(ctx, image_writer_file_ext(opts));
     if (filename) {
         mp_msg(MSGT_CPLAYER, MSGL_INFO, "*** screenshot '%s' ***\n", filename);
-        if (!write_image(image, &colorspace, &opts, filename))
+        if (!write_image(image, &colorspace, opts, filename))
             mp_msg(MSGT_CPLAYER, MSGL_ERR, "\nError writing screenshot!\n");
         talloc_free(filename);
     }