Replace pow(x, 0.75) with sqrtf(x * sqrtf(x)) for a 33% speedup.

[ffmpeg] / libavcodec / apedec.c

diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 82d567f4cfcf560403f6ff2d312888c448f32084..9b8d707135a92c65c946d213b6779f1650b22753 100644 (file)
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -23,11 +23,11 @@
 #define ALT_BITSTREAM_READER_LE
 #include "avcodec.h"
 #include "dsputil.h"
-#include "bitstream.h"
+#include "get_bits.h"
 #include "bytestream.h"
 
 /**
- * @file apedec.c
+ * @file libavcodec/apedec.c
  * Monkey's Audio lossless audio decoder
  */
 
@@ -199,6 +199,7 @@ static av_cold int ape_decode_init(AVCodecContext * avctx)
 
     dsputil_init(&s->dsp, avctx);
     avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
     return 0;
 }
 
@@ -247,6 +248,7 @@ static inline void range_dec_normalize(APEContext * ctx)
 
 /**
  * Calculate culmulative frequency for next symbol. Does NO update!
+ * @param ctx decoder context
  * @param tot_f is the total frequency or (code_value)1<<shift
  * @return the culmulative frequency
  */
@@ -259,6 +261,7 @@ static inline int range_decode_culfreq(APEContext * ctx, int tot_f)
 
 /**
  * Decode value with given size in bits
+ * @param ctx decoder context
  * @param shift number of bits to decode
  */
 static inline int range_decode_culshift(APEContext * ctx, int shift)
@@ -271,6 +274,7 @@ static inline int range_decode_culshift(APEContext * ctx, int shift)
 
 /**
  * Update decoding state
+ * @param ctx decoder context
  * @param sy_f the interval length (frequency of the symbol)
  * @param lt_f the lower end (frequency sum of < symbols)
  */
@@ -329,8 +333,9 @@ static const uint16_t counts_diff_3980[21] = {
 
 /**
  * Decode symbol
+ * @param ctx decoder context
  * @param counts probability range start position
- * @param count_diffs probability range widths
+ * @param counts_diff probability range widths
  */
 static inline int range_get_symbol(APEContext * ctx,
                                    const uint16_t counts[],
@@ -801,8 +806,10 @@ static void ape_unpack_stereo(APEContext * ctx, int count)
 
 static int ape_decode_frame(AVCodecContext * avctx,
                             void *data, int *data_size,
-                            const uint8_t * buf, int buf_size)
+                            AVPacket *avpkt)
 {
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
     APEContext *s = avctx->priv_data;
     int16_t *samples = data;
     int nblocks;