increase rate control buffer level precision

The external API exposes the RC initial/optimal/full buffer level in
milliseconds, but this value was truncated internally to seconds. This
patch allows the use of the full precision during the conversion from
time to bits.

Change-Id: If8dd2a87614c05747f81432cbe75dd9e6ed2f04e

diff --git a/vp8/encoder/onyx_if.c b/vp8/encoder/onyx_if.c
index 17b33d79aacbdebdbd1555d173876fc8cb4bd698..99c434f52abd50af1f287db97f2c9d63e45d3e4f 100644 (file)
--- a/vp8/encoder/onyx_if.c
+++ b/vp8/encoder/onyx_if.c
@@ -1326,6 +1326,18 @@ void vp8_new_frame_rate(VP8_COMP *cpi, double framerate)
     }
 }
 
+
+static int
+rescale(int val, int num, int denom)
+{
+    int64_t llnum = num;
+    int64_t llden = denom;
+    int64_t llval = val;
+
+    return llval * llnum / llden;
+}
+
+
 void vp8_init_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
 {
     VP8_COMP *cpi = (VP8_COMP *)(ptr);
@@ -1353,9 +1365,9 @@ void vp8_init_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
         cpi->oxcf.worst_allowed_q           = MAXQ;
 
         cpi->oxcf.end_usage                = USAGE_STREAM_FROM_SERVER;
-        cpi->oxcf.starting_buffer_level     =   4;
-        cpi->oxcf.optimal_buffer_level      =   5;
-        cpi->oxcf.maximum_buffer_size       =   6;
+        cpi->oxcf.starting_buffer_level     =   4000;
+        cpi->oxcf.optimal_buffer_level      =   5000;
+        cpi->oxcf.maximum_buffer_size       =   6000;
         cpi->oxcf.under_shoot_pct           =  90;
         cpi->oxcf.allow_df                 =   0;
         cpi->oxcf.drop_frames_water_mark     =  20;
@@ -1504,26 +1516,32 @@ void vp8_init_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
     // local file playback mode == really big buffer
     if (cpi->oxcf.end_usage == USAGE_LOCAL_FILE_PLAYBACK)
     {
-        cpi->oxcf.starting_buffer_level   = 60;
-        cpi->oxcf.optimal_buffer_level    = 60;
-        cpi->oxcf.maximum_buffer_size     = 240;
+        cpi->oxcf.starting_buffer_level   = 60000;
+        cpi->oxcf.optimal_buffer_level    = 60000;
+        cpi->oxcf.maximum_buffer_size     = 240000;
 
     }
 
 
     // Convert target bandwidth from Kbit/s to Bit/s
     cpi->oxcf.target_bandwidth       *= 1000;
-    cpi->oxcf.starting_buffer_level   *= cpi->oxcf.target_bandwidth;
+    cpi->oxcf.starting_buffer_level =
+        rescale(cpi->oxcf.starting_buffer_level,
+                cpi->oxcf.target_bandwidth, 1000);
 
     if (cpi->oxcf.optimal_buffer_level == 0)
         cpi->oxcf.optimal_buffer_level = cpi->oxcf.target_bandwidth / 8;
     else
-        cpi->oxcf.optimal_buffer_level *= cpi->oxcf.target_bandwidth;
+        cpi->oxcf.optimal_buffer_level =
+            rescale(cpi->oxcf.optimal_buffer_level,
+                    cpi->oxcf.target_bandwidth, 1000);
 
     if (cpi->oxcf.maximum_buffer_size == 0)
         cpi->oxcf.maximum_buffer_size = cpi->oxcf.target_bandwidth / 8;
     else
-        cpi->oxcf.maximum_buffer_size     *= cpi->oxcf.target_bandwidth;
+        cpi->oxcf.maximum_buffer_size =
+            rescale(cpi->oxcf.maximum_buffer_size,
+                    cpi->oxcf.target_bandwidth, 1000);
 
     cpi->buffer_level                = cpi->oxcf.starting_buffer_level;
     cpi->bits_off_target              = cpi->oxcf.starting_buffer_level;
@@ -1783,26 +1801,32 @@ void vp8_change_config(VP8_PTR ptr, VP8_CONFIG *oxcf)
     // local file playback mode == really big buffer
     if (cpi->oxcf.end_usage == USAGE_LOCAL_FILE_PLAYBACK)
     {
-        cpi->oxcf.starting_buffer_level   = 60;
-        cpi->oxcf.optimal_buffer_level    = 60;
-        cpi->oxcf.maximum_buffer_size     = 240;
+        cpi->oxcf.starting_buffer_level   = 60000;
+        cpi->oxcf.optimal_buffer_level    = 60000;
+        cpi->oxcf.maximum_buffer_size     = 240000;
 
     }
 
     // Convert target bandwidth from Kbit/s to Bit/s
     cpi->oxcf.target_bandwidth       *= 1000;
 
-    cpi->oxcf.starting_buffer_level   *= cpi->oxcf.target_bandwidth;
+    cpi->oxcf.starting_buffer_level =
+        rescale(cpi->oxcf.starting_buffer_level,
+                cpi->oxcf.target_bandwidth, 1000);
 
     if (cpi->oxcf.optimal_buffer_level == 0)
         cpi->oxcf.optimal_buffer_level = cpi->oxcf.target_bandwidth / 8;
     else
-        cpi->oxcf.optimal_buffer_level *= cpi->oxcf.target_bandwidth;
+        cpi->oxcf.optimal_buffer_level =
+            rescale(cpi->oxcf.optimal_buffer_level,
+                    cpi->oxcf.target_bandwidth, 1000);
 
     if (cpi->oxcf.maximum_buffer_size == 0)
         cpi->oxcf.maximum_buffer_size = cpi->oxcf.target_bandwidth / 8;
     else
-        cpi->oxcf.maximum_buffer_size     *= cpi->oxcf.target_bandwidth;
+        cpi->oxcf.maximum_buffer_size =
+            rescale(cpi->oxcf.maximum_buffer_size,
+                    cpi->oxcf.target_bandwidth, 1000);
 
     cpi->buffer_level                = cpi->oxcf.starting_buffer_level;
     cpi->bits_off_target              = cpi->oxcf.starting_buffer_level;

diff --git a/vp8/vp8_cx_iface.c b/vp8/vp8_cx_iface.c
index d0c47b35ad5cc926d3082be6eff67cec5edcc30c..40cb73776db16320d13dcaa338959203d76683b5 100644 (file)
--- a/vp8/vp8_cx_iface.c
+++ b/vp8/vp8_cx_iface.c
@@ -296,9 +296,9 @@ static vpx_codec_err_t set_vp8e_config(VP8_CONFIG *oxcf,
     oxcf->under_shoot_pct         = cfg.rc_undershoot_pct;
     //oxcf->over_shoot_pct        = cfg.rc_overshoot_pct;
 
-    oxcf->maximum_buffer_size     = cfg.rc_buf_sz / 1000;
-    oxcf->starting_buffer_level   = cfg.rc_buf_initial_sz / 1000;
-    oxcf->optimal_buffer_level    = cfg.rc_buf_optimal_sz / 1000;
+    oxcf->maximum_buffer_size     = cfg.rc_buf_sz;
+    oxcf->starting_buffer_level   = cfg.rc_buf_initial_sz;
+    oxcf->optimal_buffer_level    = cfg.rc_buf_optimal_sz;
 
     oxcf->two_pass_vbrbias        = cfg.rc_2pass_vbr_bias_pct;
     oxcf->two_pass_vbrmin_section  = cfg.rc_2pass_vbr_minsection_pct;