swresample: organize functions into doxy groups

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/swresample.h

@@ -192,6 +192,11 @@ typedef struct SwrContext SwrContext;
  */
 const AVClass *swr_get_class(void);
 
+/**
+ * @name SwrContext constructor functions
+ * @{
+ */
+
 /**
  * Allocate SwrContext.
  *
@@ -242,6 +247,13 @@ struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
                                       int log_offset, void *log_ctx);
 
+/**
+ * @}
+ *
+ * @name SwrContext destructor functions
+ * @{
+ */
+
 /**
  * Free the given SwrContext and set the pointer to NULL.
  */
@@ -258,7 +270,13 @@ void swr_free(struct SwrContext **s);
 void swr_close(struct SwrContext *s);
 
 /**
- * Convert audio.
+ * @}
+ *
+ * @name Core conversion functions
+ * @{
+ */
+
+/** Convert audio.
  *
  * in and in_count can be set to 0 to flush the last few samples out at the
  * end.
@@ -293,6 +311,15 @@ int swr_convert(struct SwrContext *s, uint8_t **out, int out_count,
  */
 int64_t swr_next_pts(struct SwrContext *s, int64_t pts);
 
+/**
+ * @}
+ *
+ * @name Low-level option setting functions
+ * These functons provide a means to set low-level options that is not possible
+ * with the AVOption API.
+ * @{
+ */
+
 /**
  * Activate resampling compensation.
  */
@@ -319,6 +346,13 @@ int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
  */
 int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride);
 
+/**
+ * @}
+ *
+ * @name Sample handling functions
+ * @{
+ */
+
 /**
  * Drops the specified number of output samples.
  */
@@ -351,6 +385,13 @@ int swr_inject_silence(struct SwrContext *s, int count);
  */
 int64_t swr_get_delay(struct SwrContext *s, int64_t base);
 
+/**
+ * @}
+ *
+ * @name Configuration accessors
+ * @{
+ */
+
 /**
  * Return the @ref LIBSWRESAMPLE_VERSION_INT constant.
  *
@@ -376,6 +417,7 @@ const char *swresample_configuration(void);
 const char *swresample_license(void);
 
 /**
+ * @}
  * @}
  */