tools/target_dec_fuzzer: adjust threshold for arbc

[ffmpeg] / libavutil / tx.h

diff --git a/libavutil/tx.h b/libavutil/tx.h
index 418e8ec1ed1b1b7100f4769d52f1194975e7b2d0..bfc0c7f2a3c76255cff01e8337fd884e64414e33 100644 (file)
--- a/libavutil/tx.h
+++ b/libavutil/tx.h
@@ -43,6 +43,7 @@ enum AVTXType {
      * The stride parameter is ignored.
      */
     AV_TX_FLOAT_FFT = 0,
+
     /**
      * Standard MDCT with sample data type of float and a scale type of
      * float. Length is the frame size, not the window size (which is 2x frame)
@@ -51,21 +52,27 @@ enum AVTXType {
      * For inverse transforms, the stride specifies the spacing between each
      * sample in the input array in bytes. The output will be a flat array.
      * Stride must be a non-zero multiple of sizeof(float).
+     * NOTE: the inverse transform is half-length, meaning the output will not
+     * contain redundant data. This is what most codecs work with.
      */
     AV_TX_FLOAT_MDCT = 1,
+
     /**
      * Same as AV_TX_FLOAT_FFT with a data type of AVComplexDouble.
      */
     AV_TX_DOUBLE_FFT = 2,
+
     /**
      * Same as AV_TX_FLOAT_MDCT with data and scale type of double.
      * Stride must be a non-zero multiple of sizeof(double).
      */
     AV_TX_DOUBLE_MDCT = 3,
+
     /**
      * Same as AV_TX_FLOAT_FFT with a data type of AVComplexInt32.
      */
     AV_TX_INT32_FFT = 4,
+
     /**
      * Same as AV_TX_FLOAT_MDCT with data type of int32_t and scale type of float.
      * Only scale values less than or equal to 1.0 are supported.
@@ -91,10 +98,21 @@ enum AVTXType {
  */
 typedef void (*av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride);
 
+/**
+ * Flags for av_tx_init()
+ */
+enum AVTXFlags {
+    /**
+     * Performs an in-place transformation on the input. The output argument
+     * of av_tn_fn() MUST match the input. May be unsupported or slower for some
+     * transform types.
+     */
+    AV_TX_INPLACE = 1ULL << 0,
+};
+
 /**
  * Initialize a transform context with the given configuration
- * Currently power of two lengths from 2 to 131072 are supported, along with
- * any length decomposable to a power of two and either 3, 5 or 15.
+ * (i)MDCTs with an odd length are currently not supported.
  *
  * @param ctx the context to allocate, will be NULL on error
  * @param tx pointer to the transform function pointer to set
@@ -102,7 +120,7 @@ typedef void (*av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride);
  * @param inv whether to do an inverse or a forward transform
  * @param len the size of the transform in samples
  * @param scale pointer to the value to scale the output if supported by type
- * @param flags currently unused
+ * @param flags a bitmask of AVTXFlags or 0
  *
  * @return 0 on success, negative error code on failure
  */