TT#50652 return media duration to SIP proxy in play_media response

Change-Id: Ib09519f960b37ca41a554aa2779f71c91ef9b49d

daemon/call_interfaces.c

@@ -1778,6 +1778,9 @@ const char *call_play_media_ng(bencode_item_t *input, bencode_item_t *output) {
 	else
 		goto out;
 
+	if (monologue->player->duration)
+		bencode_dictionary_add_integer(output, "duration", monologue->player->duration);
+
 	err = NULL;
 
 out:

daemon/media_player.c

@@ -220,6 +220,8 @@ found:
 	if (!mp->ssrc_out)
 		return -1;
 
+	mp->duration = avs->duration * 1000 * avs->time_base.num / avs->time_base.den;
+
 	return 0;
 }
 
@@ -334,6 +336,9 @@ found:
 
 // call->master_lock held in W
 static void media_player_play_start(struct media_player *mp) {
+	// needed to have usable duration for some formats. ignore errors.
+	avformat_find_stream_info(mp->fmtctx, NULL);
+
 	mp->next_run = rtpe_now;
 	// give ourselves a bit of a head start with decoding
 	timeval_add_usec(&mp->next_run, -50000);

include/media_player.h

@@ -33,6 +33,7 @@ struct media_player {
 	struct timeval next_run;
 
 	AVFormatContext *fmtctx;
+	unsigned long duration; // in milliseconds
 	AVPacket pkt;
 	struct codec_handler *handler;
 	struct ssrc_ctx *ssrc_out;