lavfi: add an audio buffer sink.

1 files changed, 20 insertions, 1 deletions

diff --git a/libavfilter/buffersink.h b/libavfilter/buffersink.h
index e579b9a..8f94a9c 100644
--- a/libavfilter/buffersink.h
+++ b/libavfilter/buffersink.h
@@ -29,7 +29,7 @@
 /**
  * Get a buffer with filtered data from sink and put it in buf.
  *
- * @param sink pointer to a context of a buffersink AVFilter.
+ * @param sink pointer to a context of a buffersink or abuffersink AVFilter.
  * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
  *            must be freed by the caller using avfilter_unref_buffer().
  *            Buf may also be NULL to query whether a buffer is ready to be
@@ -40,4 +40,23 @@
  */
 int av_buffersink_read(AVFilterContext *sink, AVFilterBufferRef **buf);
 
+/**
+ * Same as av_buffersink_read, but with the ability to specify the number of
+ * samples read. This function is less efficient than av_buffersink_read(),
+ * because it copies the data around.
+ *
+ * @param sink pointer to a context of the abuffersink AVFilter.
+ * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
+ *            must be freed by the caller using avfilter_unref_buffer(). buf
+ *            will contain exactly nb_samples audio samples, except at the end
+ *            of stream, when it can contain less than nb_samples.
+ *            Buf may also be NULL to query whether a buffer is ready to be
+ *            output.
+ *
+ * @warning do not mix this function with av_buffersink_read(). Use only one or
+ * the other with a single sink, not both.
+ */
+int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
+                               int nb_samples);
+
 #endif /* AVFILTER_BUFFERSINK_H */