FS-8406 #comment add options to scale down cavas size, fps and bandwidth

src/mod/applications/mod_conference/conference_video.c

@@ -1233,6 +1233,7 @@ void conference_video_write_canvas_image_to_codec_group(conference_obj_t *confer
 	conference_member_t *imember;
 	switch_frame_t write_frame = { 0 }, *frame = NULL;
 	switch_status_t encode_status = SWITCH_STATUS_FALSE;
+	switch_image_t *scaled_img = codec_set->scaled_img;
 
 	write_frame = codec_set->frame;
 	frame = &write_frame;
@@ -1254,6 +1255,16 @@ void conference_video_write_canvas_image_to_codec_group(conference_obj_t *confer
 		switch_core_codec_control(&codec_set->codec, SCC_VIDEO_GEN_KEYFRAME, SCCT_NONE, NULL, SCCT_NONE, NULL, NULL, NULL);
 	}
 
+	if (scaled_img) {
+		if (!send_keyframe && codec_set->fps_divisor > 1 && (codec_set->frame_count++) % codec_set->fps_divisor) {
+			// switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Skip one frame, total: %d\n", codec_set->frame_count);
+			return;
+		}
+
+		switch_img_scale(frame->img, &scaled_img, scaled_img->d_w, scaled_img->d_h);
+		frame->img = scaled_img;
+	}
+
 	do {
 
 		frame->data = ((unsigned char *)frame->packet) + 12;
@@ -2320,6 +2331,28 @@ void *SWITCH_THREAD_FUNC conference_video_muxing_thread_run(switch_thread_t *thr
 								write_codecs[i]->frame.data = ((uint8_t *)write_codecs[i]->frame.packet) + 12;
 								write_codecs[i]->frame.packetlen = buflen;
 								write_codecs[i]->frame.buflen = buflen - 12;
+								if (conference->scale_h264_canvas_width > 0 && conference->scale_h264_canvas_height > 0 && !strcmp(check_codec->implementation->iananame, "H264")) {
+									int32_t bw = -1;
+
+									write_codecs[i]->fps_divisor = conference->scale_h264_canvas_fps_divisor;
+									write_codecs[i]->scaled_img = switch_img_alloc(NULL, SWITCH_IMG_FMT_I420, conference->scale_h264_canvas_width, conference->scale_h264_canvas_height, 16);
+
+									if (conference->scale_h264_canvas_bandwidth) {
+										if (strcasecmp(conference->scale_h264_canvas_bandwidth, "auto")) {
+											bw = switch_parse_bandwidth_string(conference->scale_h264_canvas_bandwidth);
+										}
+									}
+
+									if (bw == -1) {
+										float fps = conference->video_fps.fps;
+
+										if (write_codecs[i]->fps_divisor) fps /= write_codecs[i]->fps_divisor;
+
+										bw = switch_calc_bitrate(conference->scale_h264_canvas_width, conference->scale_h264_canvas_height, conference->video_quality, fps);
+									}
+
+									switch_core_codec_control(&write_codecs[i]->codec, SCC_VIDEO_BANDWIDTH, SCCT_INT, &bw, SCCT_NONE, NULL, NULL, NULL);
+								}
 								switch_set_flag((&write_codecs[i]->frame), SFF_RAW_RTP);
 
 							}
@@ -2984,6 +3017,7 @@ pp						conference_video_set_incoming_bitrate(imember, kps, SWITCH_TRUE);
 	for (i = 0; i < MAX_MUX_CODECS; i++) {
 		if (write_codecs[i] && switch_core_codec_ready(&write_codecs[i]->codec)) {
 			switch_core_codec_destroy(&write_codecs[i]->codec);
+			switch_img_free(&(write_codecs[i]->scaled_img));
 		}
 	}
 

src/mod/applications/mod_conference/mod_conference.c

@@ -2411,7 +2411,12 @@ conference_obj_t *conference_new(char *name, conference_xml_cfg_t cfg, switch_co
 	const char *force_rate = NULL, *force_interval = NULL, *force_channels = NULL, *presence_id = NULL;
 	uint32_t force_rate_i = 0, force_interval_i = 0, force_channels_i = 0, video_auto_floor_msec = 0;
 	switch_event_t *event;
-	
+
+	int scale_h264_canvas_width = 0;
+	int scale_h264_canvas_height = 0;
+	int scale_h264_canvas_fps_divisor = 0;
+	char *scale_h264_canvas_bandwidth = NULL;
+
 	/* Validate the conference name */
 	if (zstr(name)) {
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Invalid Record! no name.\n");
@@ -2720,6 +2725,28 @@ conference_obj_t *conference_new(char *name, conference_xml_cfg_t cfg, switch_co
 				} else {
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "video-mode invalid, valid settings are 'passthrough', 'transcode' and 'mux'\n");
 				}
+			} else if (!strcasecmp(var, "scale-h264-canvas-size") && !zstr(val)) {
+				char *p;
+
+				if ((scale_h264_canvas_width = atoi(val))) {
+					if ((p = strchr(val, 'x'))) {
+						p++;
+						if (*p) {
+							scale_h264_canvas_height = atoi(p);
+						}
+					}
+				}
+
+				if (scale_h264_canvas_width < 320 || scale_h264_canvas_width < 180) {
+					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "Invalid scale-h264-canvas-size, falling back to 320x180\n");
+					scale_h264_canvas_width = 320;
+					scale_h264_canvas_width = 180;
+				}
+			} else if (!strcasecmp(var, "scale-h264-canvas-fps-divisor") && !zstr(val)) {
+				scale_h264_canvas_fps_divisor = atoi(val);
+				if (scale_h264_canvas_fps_divisor < 0) scale_h264_canvas_fps_divisor = 0;
+			} else if (!strcasecmp(var, "scale-h264-canvas-bandwidth") && !zstr(val)) {
+				scale_h264_canvas_bandwidth = val;
 			}
 		}
 
@@ -2783,6 +2810,11 @@ conference_obj_t *conference_new(char *name, conference_xml_cfg_t cfg, switch_co
 
 	conference->conference_video_mode = conference_video_mode;
 
+	conference->scale_h264_canvas_width = scale_h264_canvas_width;
+	conference->scale_h264_canvas_height = scale_h264_canvas_height;
+	conference->scale_h264_canvas_fps_divisor = scale_h264_canvas_fps_divisor;
+	conference->scale_h264_canvas_bandwidth = switch_core_strdup(conference->pool, scale_h264_canvas_bandwidth);
+
 	if (!switch_core_has_video() && (conference->conference_video_mode == CONF_VIDEO_MODE_MUX || conference->conference_video_mode == CONF_VIDEO_MODE_TRANSCODE)) {
 		conference->conference_video_mode = CONF_VIDEO_MODE_PASSTHROUGH;
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "video-mode invalid, only valid setting is 'passthrough' due to no video capabilities\n");

src/mod/applications/mod_conference/mod_conference.h

@@ -663,6 +663,12 @@ typedef struct conference_obj {
 	video_layout_t *new_personal_vlayout;
 	int max_bw_in;
 	int force_bw_in;
+
+	/* special use case, scalling shared h264 canvas*/
+	int scale_h264_canvas_width;
+	int scale_h264_canvas_height;
+	int scale_h264_canvas_fps_divisor;
+	char *scale_h264_canvas_bandwidth;
 } conference_obj_t;
 
 /* Relationship with another member */
@@ -794,6 +800,9 @@ typedef struct codec_set_s {
 	switch_codec_t codec;
 	switch_frame_t frame;
 	uint8_t *packet;
+	switch_image_t *scaled_img;
+	uint8_t fps_divisor;
+	uint32_t frame_count;
 } codec_set_t;
 
 typedef void (*conference_key_callback_t) (conference_member_t *, struct caller_control_actions *);