FS-7519: increase default video buffer to 2mb in avformat and add vbuf file…

FS-7519: increase default video buffer to 2mb in avformat and add vbuf file param to change it per file using a number of bytes with k or m modifier for kilobytes and megabytes

src/include/switch_module_interfaces.h

@@ -307,6 +307,7 @@ typedef struct switch_mm_s {
 	int vw;
 	int vh;
 	float fps;
+	int vbuf;
 } switch_mm_t;
 
 /*! an abstract representation of a file handle (some parameters based on compat with libsndfile) */

src/mod/formats/mod_avformat/mod_avformat.c

@@ -177,6 +177,8 @@ static switch_status_t add_stream(OutputStream *ost, AVFormatContext *oc, AVCode
 	AVCodecContext *c;
 	switch_status_t status = SWITCH_STATUS_FALSE;
 	int threads = switch_core_cpu_count();
+	int buffer_bytes = 2097152; /* 2 mb */
+
 	/* find the encoder */
 	*codec = avcodec_find_encoder(codec_id);
 	if (!(*codec)) {
@@ -217,6 +219,13 @@ static switch_status_t add_stream(OutputStream *ost, AVFormatContext *oc, AVCode
 		break;
 
 	case AVMEDIA_TYPE_VIDEO:
+
+		if (mm) {
+			if (mm->vbuf) {
+				buffer_bytes = mm->vbuf;
+			}
+		}
+
 		c->codec_id = codec_id;
 		c->bit_rate = 1000000;
 		/* Resolution must be a multiple of two. */
@@ -227,7 +236,8 @@ static switch_status_t add_stream(OutputStream *ost, AVFormatContext *oc, AVCode
 		c->gop_size      = 25; /* emit one intra frame every x frames at most */
 		c->pix_fmt       = AV_PIX_FMT_YUV420P;
 		c->thread_count  = threads;
-		c->rc_initial_buffer_occupancy = 1024 * 1024 * 8;
+		c->rc_initial_buffer_occupancy = buffer_bytes * 8;
+
 		if (codec_id == AV_CODEC_ID_VP8) {
 			av_set_options_string(c, "quality=realtime", "=", ":");
 		}

src/switch_core_file.c

@@ -157,6 +157,22 @@ SWITCH_DECLARE(switch_status_t) switch_core_perform_file_open(const char *file,
 				fh->mm.fps = ftmp;
 			}
 		}
+
+		if ((val = switch_event_get_header(fh->params, "vbuf"))) {
+			tmp = atoi(val);
+
+			if (strrchr(val, 'k')) {
+				tmp *= 1024;
+			} else if (strrchr(val, 'm')) {
+				tmp *= 1048576;
+			}
+			
+			if (tmp > 0 && tmp < 52428800 /*50mb*/) {
+				fh->mm.vbuf = tmp;
+			} else {
+				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Invalid buffer size: %d\n", tmp);
+			}
+		}
 	}
 
 	if (switch_directory_exists(file_path, fh->memory_pool) == SWITCH_STATUS_SUCCESS) {