FS-7983 Added param for specifying video encoding speed

With this patch, the param vencspd can be set to slow, medium, or fast to
adjust the speed of video encoding on a per file basis. Currently, this
only has an affect on files recorded using mod_av with H.264 as the video
codec.

src/include/switch_module_interfaces.h

@@ -298,6 +298,13 @@ struct switch_file_interface {
 	struct switch_file_interface *next;
 };
 
+typedef enum {
+	SWITCH_VIDEO_ENCODE_SPEED_DEFAULT;
+	SWITCH_VIDEO_ENCODE_SPEED_SLOW,
+	SWITCH_VIDEO_ENCODE_SPEED_MEDIUM,
+	SWITCH_VIDEO_ENCODE_SPEED_FAST
+} switch_video_encode_speed_t;
+
 typedef struct switch_mm_s {
 	int samplerate;
 	int channels;
@@ -308,6 +315,7 @@ typedef struct switch_mm_s {
 	int vh;
 	float fps;
 	int vbuf;
+	switch_video_encode_speed_t vencspd;
 } switch_mm_t;
 
 /*! an abstract representation of a file handle (some parameters based on compat with libsndfile) */

src/mod/applications/mod_av/avformat.c

@@ -299,6 +299,20 @@ static switch_status_t add_stream(MediaStream *mst, AVFormatContext *fc, AVCodec
 
 		if (codec_id == AV_CODEC_ID_H264) {
 			c->ticks_per_frame = 2;
+
+			switch (mm->vencspd) {
+				case SWITCH_VIDEO_ENCODE_SPEED_SLOW:
+					av_opt_set(c->priv_data, "preset", "veryslow", 0);
+					break;
+				case SWITCH_VIDEO_ENCODE_SPEED_MEDIUM:
+					av_opt_set(c->priv_data, "preset", "medium", 0);
+					break;
+				case SWITCH_VIDEO_ENCODE_SPEED_FAST:
+					av_opt_set(c->priv_data, "preset", "ultrafast", 0);
+					break;
+				default:
+					break;
+			}
 		}
 
 		if (codec_id == AV_CODEC_ID_VP8) {

src/switch_core_file.c

@@ -84,6 +84,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_perform_file_open(const char *file,
 	fh->mm.channels = 1;
 	fh->mm.keyint = 60;
 	fh->mm.ab = 128;
+	fh->mm.vencspd = SWITCH_VIDEO_ENCODE_SPEED_DEFAULT;
 
 	if (*file_path == '{') {
 		char *timeout;
@@ -186,6 +187,18 @@ SWITCH_DECLARE(switch_status_t) switch_core_perform_file_open(const char *file,
 				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Invalid buffer size: %d\n", tmp);
 			}
 		}
+
+		if ((val = switch_event_get_header(fh->params, "vencspd"))) {
+			if (!strcasecmp(val, "slow")) {
+				fh->mm.vencspd = SWITCH_VIDEO_ENCODE_SPEED_SLOW;
+			} else if (!strcasecmp(val, "medium")) {
+				fh->mm.vencspd = SWITCH_VIDEO_ENCODE_SPEED_MEDIUM;
+			} else if (!strcasecmp(val, "fast")) {
+				fh->mm.vencspd = SWITCH_VIDEO_ENCODE_SPEED_FAST;
+			} else {
+				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Invalid video encode speed: %s\n", val);
+			}
+		}
 	}
 
 	if (switch_directory_exists(file_path, fh->memory_pool) == SWITCH_STATUS_SUCCESS) {