vp9enc: provide support for multiple pass cache files

Some files may provide different caps insight of one stream. Since
vp9enc support caps reinit, we should support cache reinit too.
If more then file cache file will be created, the naming will be:
cache cache.1 cache.2 ...

Based on patch by: Oleksij Rempel <linux@rempel-privat.de>

https://bugzilla.gnome.org/show_bug.cgi?id=747728

2 files changed, 37 insertions, 15 deletions

diff --git a/ext/vpx/gstvp9enc.c b/ext/vpx/gstvp9enc.c
index 4f272b4bb..08ec6f2b3 100644
--- a/ext/vpx/gstvp9enc.c
+++ b/ext/vpx/gstvp9enc.c
@@ -529,7 +529,9 @@ gst_vp9_enc_class_init (GstVP9EncClass * klass)
 
   g_object_class_install_property (gobject_class, PROP_MULTIPASS_CACHE_FILE,
       g_param_spec_string ("multipass-cache-file", "Multipass Cache File",
-          "Multipass cache file",
+          "Multipass cache file. "
+          "If stream caps reinited, multiple files will be created: "
+          "file, file.1, file.2, ... and so on.",
           DEFAULT_MULTIPASS_CACHE_FILE,
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
 
@@ -731,7 +733,9 @@ gst_vp9_enc_init (GstVP9Enc * gst_vp9_enc)
   gst_vp9_enc->cfg.kf_mode = DEFAULT_KF_MODE;
   gst_vp9_enc->cfg.kf_max_dist = DEFAULT_KF_MAX_DIST;
   gst_vp9_enc->cfg.g_pass = DEFAULT_MULTIPASS_MODE;
-  gst_vp9_enc->multipass_cache_file = g_strdup (DEFAULT_MULTIPASS_CACHE_FILE);
+  gst_vp9_enc->multipass_cache_prefix = g_strdup (DEFAULT_MULTIPASS_CACHE_FILE);
+  gst_vp9_enc->multipass_cache_file = NULL;
+  gst_vp9_enc->multipass_cache_idx = 0;
   gst_vp9_enc->cfg.ts_number_layers = DEFAULT_TS_NUMBER_LAYERS;
   gst_vp9_enc->n_ts_target_bitrate = 0;
   gst_vp9_enc->n_ts_rate_decimator = 0;
@@ -773,8 +777,9 @@ gst_vp9_enc_finalize (GObject * object)
   g_return_if_fail (GST_IS_VP9_ENC (object));
   gst_vp9_enc = GST_VP9_ENC (object);
 
+  g_free (gst_vp9_enc->multipass_cache_prefix);
   g_free (gst_vp9_enc->multipass_cache_file);
-  gst_vp9_enc->multipass_cache_file = NULL;
+  gst_vp9_enc->multipass_cache_idx = 0;
 
   if (gst_vp9_enc->input_state)
     gst_video_codec_state_unref (gst_vp9_enc->input_state);
@@ -876,9 +881,9 @@ gst_vp9_enc_set_property (GObject * object, guint prop_id,
       global = TRUE;
       break;
     case PROP_MULTIPASS_CACHE_FILE:
-      if (gst_vp9_enc->multipass_cache_file)
-        g_free (gst_vp9_enc->multipass_cache_file);
-      gst_vp9_enc->multipass_cache_file = g_value_dup_string (value);
+      if (gst_vp9_enc->multipass_cache_prefix)
+        g_free (gst_vp9_enc->multipass_cache_prefix);
+      gst_vp9_enc->multipass_cache_prefix = g_value_dup_string (value);
       break;
     case PROP_TS_NUMBER_LAYERS:
       gst_vp9_enc->cfg.ts_number_layers = g_value_get_int (value);
@@ -1238,7 +1243,7 @@ gst_vp9_enc_get_property (GObject * object, guint prop_id, GValue * value,
       g_value_set_enum (value, gst_vp9_enc->cfg.g_pass);
       break;
     case PROP_MULTIPASS_CACHE_FILE:
-      g_value_set_string (value, gst_vp9_enc->multipass_cache_file);
+      g_value_set_string (value, gst_vp9_enc->multipass_cache_prefix);
       break;
     case PROP_TS_NUMBER_LAYERS:
       g_value_set_int (value, gst_vp9_enc->cfg.ts_number_layers);
@@ -1493,6 +1498,7 @@ gst_vp9_enc_set_format (GstVideoEncoder * video_encoder,
     g_mutex_lock (&encoder->encoder_lock);
     vpx_codec_destroy (&encoder->encoder);
     encoder->inited = FALSE;
+    encoder->multipass_cache_idx++;
   } else {
     g_mutex_lock (&encoder->encoder_lock);
   }
@@ -1523,20 +1529,34 @@ gst_vp9_enc_set_format (GstVideoEncoder * video_encoder,
     encoder->cfg.g_timebase.den = 90000;
   }
 
-  if (encoder->cfg.g_pass == VPX_RC_FIRST_PASS) {
-    if (encoder->first_pass_cache_content == NULL) {
-      encoder->first_pass_cache_content = g_byte_array_sized_new (4096);
-    }
-  } else if (encoder->cfg.g_pass == VPX_RC_LAST_PASS) {
-    GError *err = NULL;
-
-    if (!encoder->multipass_cache_file) {
+  if (encoder->cfg.g_pass == VPX_RC_FIRST_PASS ||
+      encoder->cfg.g_pass == VPX_RC_LAST_PASS) {
+    if (!encoder->multipass_cache_prefix) {
       GST_ELEMENT_ERROR (encoder, RESOURCE, OPEN_READ,
           ("No multipass cache file provided"), (NULL));
       g_mutex_unlock (&encoder->encoder_lock);
       return FALSE;
     }
 
+    g_free (encoder->multipass_cache_file);
+
+    if (encoder->multipass_cache_idx > 0)
+      encoder->multipass_cache_file = g_strdup_printf ("%s.%u",
+          encoder->multipass_cache_prefix, encoder->multipass_cache_idx);
+    else
+      encoder->multipass_cache_file =
+          g_strdup (encoder->multipass_cache_prefix);
+  }
+
+  if (encoder->cfg.g_pass == VPX_RC_FIRST_PASS) {
+    if (encoder->first_pass_cache_content != NULL)
+      g_byte_array_free (encoder->first_pass_cache_content, TRUE);
+
+    encoder->first_pass_cache_content = g_byte_array_sized_new (4096);
+
+  } else if (encoder->cfg.g_pass == VPX_RC_LAST_PASS) {
+    GError *err = NULL;
+
     if (encoder->cfg.rc_twopass_stats_in.buf != NULL) {
       g_free (encoder->cfg.rc_twopass_stats_in.buf);
       encoder->cfg.rc_twopass_stats_in.buf = NULL;
diff --git a/ext/vpx/gstvp9enc.h b/ext/vpx/gstvp9enc.h
index 7851f1a32..e85a802f1 100644
--- a/ext/vpx/gstvp9enc.h
+++ b/ext/vpx/gstvp9enc.h
@@ -73,6 +73,8 @@ struct _GstVP9Enc
   gint n_ts_layer_id;
   /* Global two-pass options */
   gchar *multipass_cache_file;
+  gchar *multipass_cache_prefix;
+  guint multipass_cache_idx;
   GByteArray *first_pass_cache_content;
 
   /* Encode parameter */