Add notion of encoding_capturer and decoding_renderer.

include/mediastreamer2/msfilter.h

@@ -81,7 +81,11 @@ enum _MSFilterCategory{
 	/**used by encoders*/
 	MS_FILTER_ENCODER,
 	/**used by decoders*/
-	MS_FILTER_DECODER
+	MS_FILTER_DECODER,
+	/**used by capture filters that perform encoding*/
+	MS_FILTER_ENCODING_CAPTURER,
+	/**used by render filters that perform decoding*/
+	MS_FILTER_DECODING_RENDERER
 };
 
 /**
@@ -90,6 +94,8 @@ enum _MSFilterCategory{
  *     MS_FILTER_OTHER
  *     MS_FILTER_ENCODER
  *     MS_FILTER_DECODER
+ *     MS_FILTER_ENCODING_CAPTURER
+ *     MS_FILTER_DECODING_RENDERER
  * </PRE>
  * @var MSFilterCategory
  */
@@ -207,6 +213,24 @@ extern "C"{
  */
 MS2_PUBLIC void ms_filter_register(MSFilterDesc *desc);
 
+/**
+ * Retrieve capture filter that supports encoding to codec name.
+ *
+ * @param mime    A string indicating the codec.
+ *
+ * Returns: a MSFilterDesc if successfull, NULL otherwise.
+ */
+MS2_PUBLIC MSFilterDesc * ms_filter_get_encoding_capturer(const char *mime);
+
+/**
+ * Retrieve render filter that supports decoding to codec name.
+ *
+ * @param mime    A string indicating the codec.
+ *
+ * Returns: a MSFilterDesc if successfull, NULL otherwise.
+ */
+MS2_PUBLIC MSFilterDesc * ms_filter_get_decoding_renderer(const char *mime);
+
 /**
  * Retrieve encoders according to codec name.
  *

src/base/msfilter.c

@@ -60,8 +60,11 @@ void ms_filter_unregister_all(){
 }
 
 bool_t ms_filter_codec_supported(const char *mime){
-	MSFilterDesc *enc = ms_filter_get_encoder(mime);
-	MSFilterDesc *dec = ms_filter_get_decoder(mime);
+	MSFilterDesc *enc = ms_filter_get_encoding_capturer(mime);
+	MSFilterDesc *dec = ms_filter_get_decoding_renderer(mime);
+
+	if (enc == NULL) enc = ms_filter_get_encoder(mime);
+	if (dec == NULL) dec = ms_filter_get_decoder(mime);
 
 	if(enc!=NULL && dec!=NULL) return TRUE;
 
@@ -70,6 +73,52 @@ bool_t ms_filter_codec_supported(const char *mime){
 	return FALSE;
 }
 
+MSFilterDesc * ms_filter_get_encoding_capturer(const char *mime) {
+	MSList *elem;
+
+	for (elem = desc_list; elem != NULL; elem = ms_list_next(elem)) {
+		MSFilterDesc *desc = (MSFilterDesc *)elem->data;
+		if (desc->category == MS_FILTER_ENCODING_CAPTURER) {
+			char *saveptr;
+			char *enc_fmt = ms_strdup(desc->enc_fmt);
+			char *token = strtok_r(enc_fmt, " ", &saveptr);
+			while (token != NULL) {
+				if (strcasecmp(token, mime) == 0) {
+					break;
+				}
+				token = strtok_r(NULL, " ", &saveptr);
+			}
+			ms_free(enc_fmt);
+			if (token != NULL) return desc;
+		}
+	}
+
+	return NULL;
+}
+
+MSFilterDesc * ms_filter_get_decoding_renderer(const char *mime) {
+	MSList *elem;
+
+	for (elem = desc_list; elem != NULL; elem = ms_list_next(elem)) {
+		MSFilterDesc *desc = (MSFilterDesc *)elem->data;
+		if (desc->category == MS_FILTER_DECODING_RENDERER) {
+			char *saveptr;
+			char *enc_fmt = ms_strdup(desc->enc_fmt);
+			char *token = strtok_r(enc_fmt, " ", &saveptr);
+			while (token != NULL) {
+				if (strcasecmp(token, mime) == 0) {
+					break;
+				}
+				token = strtok_r(NULL, " ", &saveptr);
+			}
+			ms_free(enc_fmt);
+			if (token != NULL) return desc;
+		}
+	}
+
+	return NULL;
+}
+
 MSFilterDesc * ms_filter_get_encoder(const char *mime){
 	MSList *elem;
 	for (elem=desc_list;elem!=NULL;elem=ms_list_next(elem)){