Give all anonymously typedeffed structs in headers a name

Anonymous structs cannot be forward declared and have no benefit.

libavcodec/sbr.h

@@ -37,7 +37,7 @@
 /**
  * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
  */
-typedef struct {
+typedef struct SpectrumParameters {
     uint8_t bs_start_freq;
     uint8_t bs_stop_freq;
     uint8_t bs_xover_band;
@@ -57,7 +57,7 @@ typedef struct {
 /**
  * Spectral Band Replication per channel data
  */
-typedef struct {
+typedef struct SBRData {
     /**
      * @name Main bitstream data variables
      * @{
@@ -111,7 +111,7 @@ typedef struct {
 /**
  * Spectral Band Replication
  */
-typedef struct {
+typedef struct SpectralBandReplication {
     int                sample_rate;
     int                start;
     int                reset;