audioutils: modify _parse, add GType support functions

gst-libs/gst/audio/gstbaseaudiodecoder.c

@@ -418,7 +418,7 @@ gst_base_audio_decoder_reset (GstBaseAudioDecoder * dec, gboolean full)
     dec->priv->error_count = 0;
     gst_base_audio_decoder_clear_queues (dec);
 
-    g_free (dec->priv->ctx.info.channel_pos);
+    gst_base_audio_format_info_clear (&dec->priv->ctx.info);
     memset (&dec->priv->ctx, 0, sizeof (dec->priv->ctx));
 
     if (dec->priv->taglist) {
@@ -470,7 +470,7 @@ gst_base_audio_decoder_src_setcaps (GstPad * pad, GstCaps * caps)
 {
   GstBaseAudioDecoder *dec;
   GstAudioFormatInfo *state;
-  gboolean res = TRUE, changed;
+  gboolean res = TRUE;
 
   dec = GST_BASE_AUDIO_DECODER (gst_pad_get_parent (pad));
   state = &dec->priv->ctx.info;
@@ -489,7 +489,7 @@ gst_base_audio_decoder_src_setcaps (GstPad * pad, GstCaps * caps)
     dec->priv->samples = 0;
   }
 
-  if (!gst_base_audio_parse_caps (caps, state, &changed))
+  if (!gst_base_audio_parse_caps (caps, state))
     goto refuse_caps;
 
   gst_object_unref (dec);

gst-libs/gst/audio/gstbaseaudioencoder.c

@@ -410,7 +410,7 @@ gst_base_audio_encoder_reset (GstBaseAudioEncoder * enc, gboolean full)
     enc->priv->active = FALSE;
     enc->priv->samples_in = 0;
     enc->priv->bytes_out = 0;
-    g_free (enc->priv->ctx.info.channel_pos);
+    gst_base_audio_format_info_clear (&enc->priv->ctx.info);
     memset (&enc->priv->ctx, 0, sizeof (enc->priv->ctx));
   }
 
@@ -941,7 +941,7 @@ gst_base_audio_encoder_sink_setcaps (GstPad * pad, GstCaps * caps)
   GstBaseAudioEncoder *enc;
   GstBaseAudioEncoderClass *klass;
   GstBaseAudioEncoderContext *ctx;
-  GstAudioFormatInfo *state;
+  GstAudioFormatInfo *state, *ostate;
   gboolean res = TRUE, changed = FALSE;
 
   enc = GST_BASE_AUDIO_ENCODER (GST_PAD_PARENT (pad));
@@ -965,9 +965,13 @@ gst_base_audio_encoder_sink_setcaps (GstPad * pad, GstCaps * caps)
     enc->priv->samples = 0;
   }
 
-  if (!gst_base_audio_parse_caps (caps, state, &changed))
+  ostate = gst_base_audio_format_info_copy (state);
+  if (!gst_base_audio_parse_caps (caps, state))
     goto refuse_caps;
 
+  changed = gst_base_audio_compare_format_info (state, ostate);
+  gst_base_audio_format_info_free (ostate);
+
   if (changed) {
     GstClockTime old_min_latency;
     GstClockTime old_max_latency;

gst-libs/gst/audio/gstbaseaudioutils.c

@@ -24,13 +24,98 @@
 #include <gst/gst.h>
 #include <gst/audio/multichannel.h>
 
+#include <string.h>
+
+/**
+ * gst_base_audio_format_init:
+ * @info: (transfer none): a #GstAudioFormatInfo instance
+ *
+ * Initializes a #GstAudioFormatInfo instance for subsequent use.
+ * The instance must either have been previously cleared or set to 0
+ * upon allocation.
+ */
+void
+gst_base_audio_format_info_init (GstAudioFormatInfo * info)
+{
+  g_return_if_fail (info != NULL);
+
+  /* no-op for now */
+}
+
+/**
+ * gst_base_audio_format_info_new:
+ *
+ * Allocate a new #GstAudioFormatInfo structure and initialize it using
+ * gst_base_audio_format_info().
+ *
+ * Free-function: gst_base_audio_format_info_free
+ *
+ * Returns: (transfer full): a new #GstAudioFormatInfo,
+ * free with gst_base_audio_format_info_free().
+ */
+GstAudioFormatInfo *
+gst_base_audio_format_info_new (void)
+{
+  GstAudioFormatInfo *result;
+
+  result = g_slice_new0 (GstAudioFormatInfo);
+  gst_base_audio_format_info_init (result);
+
+  return result;
+}
+
+/**
+ * gst_base_audio_format_clear:
+ * @info: (transfer none): a #GstAudioFormatInfo instance
+ *
+ * Clears a #GstAudioFormatInfo instance.
+ */
+void
+gst_base_audio_format_info_clear (GstAudioFormatInfo * info)
+{
+  g_return_if_fail (info != NULL);
+
+  g_free (info->channel_pos);
+  memset (info, 0, sizeof (*info));
+}
+
+/**
+ * gst_base_audio_format_copy:
+ * @info: (transfer none): a #GstAudioFormatInfo instance
+ *
+ * Create a copy of a given #GstAudioFormatInfo instance.
+ *
+ * Returns: (transfer full): a new #GstAudioFormatInfo,
+ * free with gst_base_audio_format_info_free()
+ */
+GstAudioFormatInfo *
+gst_base_audio_format_info_copy (GstAudioFormatInfo * info)
+{
+  GstAudioFormatInfo *result = NULL;
+
+  if (info) {
+    result = (GstAudioFormatInfo *) g_slice_copy (sizeof (GstAudioFormatInfo),
+        info);
+  }
+  return result;
+}
+
+/**
+ * gst_base_audio_format_free:
+ * @info: (in) (transfer full): a #GstAudioFormatInfo instance
+ *
+ * Frees the allocated @info.
+ */
+void
+gst_base_audio_format_info_free (GstAudioFormatInfo * info)
+{
+  g_slice_free (GstAudioFormatInfo, info);
+}
 
 #define CHECK_VALUE(var, val) \
 G_STMT_START { \
   if (!res) \
     goto fail; \
-  if (var != val) \
-    changed = TRUE; \
   var = val; \
 } G_STMT_END
 
@@ -38,19 +123,16 @@ G_STMT_START { \
  * gst_base_audio_parse_caps:
  * @caps: a #GstCaps
  * @state: a #GstAudioFormatInfo
- * @changed: whether @caps introduced a change in current @state
  *
  * Parses audio format as represented by @caps into a more concise form
- * as represented by @state, while checking if for changes to currently
- * defined audio format.
+ * as represented by @state.
  *
  * Returns: TRUE if parsing succeeded, otherwise FALSE
  */
 gboolean
-gst_base_audio_parse_caps (GstCaps * caps, GstAudioFormatInfo * state,
-    gboolean * _changed)
+gst_base_audio_parse_caps (GstCaps * caps, GstAudioFormatInfo * info)
 {
-  gboolean res = TRUE, changed = FALSE;
+  gboolean res = TRUE;
   GstStructure *s;
   gboolean vb;
   gint vi;
@@ -58,37 +140,35 @@ gst_base_audio_parse_caps (GstCaps * caps, GstAudioFormatInfo * state,
   g_return_val_if_fail (caps != NULL, FALSE);
   g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
 
+  gst_base_audio_format_info_clear (info);
+
   s = gst_caps_get_structure (caps, 0);
   if (gst_structure_has_name (s, "audio/x-raw-int"))
-    state->is_int = TRUE;
+    info->is_int = TRUE;
   else if (gst_structure_has_name (s, "audio/x-raw-float"))
-    state->is_int = FALSE;
+    info->is_int = FALSE;
   else
     goto fail;
 
   res = gst_structure_get_int (s, "rate", &vi);
-  CHECK_VALUE (state->rate, vi);
+  CHECK_VALUE (info->rate, vi);
   res &= gst_structure_get_int (s, "channels", &vi);
-  CHECK_VALUE (state->channels, vi);
+  CHECK_VALUE (info->channels, vi);
   res &= gst_structure_get_int (s, "width", &vi);
-  CHECK_VALUE (state->width, vi);
-  res &= (!state->is_int || gst_structure_get_int (s, "depth", &vi));
-  CHECK_VALUE (state->depth, vi);
+  CHECK_VALUE (info->width, vi);
+  res &= (!info->is_int || gst_structure_get_int (s, "depth", &vi));
+  CHECK_VALUE (info->depth, vi);
   res &= gst_structure_get_int (s, "endianness", &vi);
-  CHECK_VALUE (state->endian, vi);
-  res &= (!state->is_int || gst_structure_get_boolean (s, "signed", &vb));
-  CHECK_VALUE (state->sign, vb);
+  CHECK_VALUE (info->endian, vi);
+  res &= (!info->is_int || gst_structure_get_boolean (s, "signed", &vb));
+  CHECK_VALUE (info->sign, vb);
 
-  state->bpf = (state->width / 8) * state->channels;
-  GST_LOG ("bpf: %d", state->bpf);
-  if (!state->bpf)
+  info->bpf = (info->width / 8) * info->channels;
+  GST_LOG ("bpf: %d", info->bpf);
+  if (!info->bpf)
     goto fail;
 
-  g_free (state->channel_pos);
-  state->channel_pos = gst_audio_get_channel_positions (s);
-
-  if (_changed)
-    *_changed = changed;
+  info->channel_pos = gst_audio_get_channel_positions (s);
 
   return res;
 
@@ -101,6 +181,27 @@ fail:
   }
 }
 
+/**
+ * gst_base_audio_compare_format_info:
+ * @from: a #GstAudioFormatInfo
+ * @to: a #GstAudioFormatInfo
+ *
+ * Checks whether provides #GstAudioFormatInfo instances represent identical
+ * audio dat.
+ *
+ * Returns: TRUE if represent audio formats are identical
+ */
+gboolean
+gst_base_audio_compare_format_info (GstAudioFormatInfo * from,
+    GstAudioFormatInfo * to)
+{
+  g_return_val_if_fail (from != NULL, FALSE);
+  g_return_val_if_fail (to != NULL, FALSE);
+
+  /* this is a bit silly, so maybe should not need this function at all */
+  return memcmp (from, to, sizeof (*from));
+}
+
 /**
  * gst_base_audio_add_streamheader:
  * @caps: a #GstCaps

gst-libs/gst/audio/gstbaseaudioutils.h

@@ -56,8 +56,15 @@ typedef struct _GstAudioFormatInfo {
   gint  bpf;
 } GstAudioFormatInfo;
 
-gboolean gst_base_audio_parse_caps (GstCaps * caps,
-    GstAudioFormatInfo * state, gboolean * changed);
+void gst_base_audio_format_info_init (GstAudioFormatInfo * info);
+void gst_base_audio_format_info_clear (GstAudioFormatInfo * info);
+GstAudioFormatInfo *gst_base_audio_format_info_new (void);
+void gst_base_audio_format_info_free (GstAudioFormatInfo * info);
+GstAudioFormatInfo *gst_base_audio_format_info_copy (GstAudioFormatInfo * info);
+
+gboolean gst_base_audio_parse_caps (GstCaps * caps, GstAudioFormatInfo * info);
+gboolean gst_base_audio_compare_format_info (GstAudioFormatInfo * from,
+                                             GstAudioFormatInfo * to);
 
 GstCaps *gst_base_audio_add_streamheader (GstCaps * caps, GstBuffer * buf, ...);