rv40: NEON optimised chroma MC

[ffmpeg] / libavcodec / ac3enc_float.c

diff --git a/libavcodec/ac3enc_float.c b/libavcodec/ac3enc_float.c
index 9f691a1e16b288956934bbb75fb40bfdc69b83fe..a4abd89d4da3df06054c67806b3e01dcbf7dd4e8 100644 (file)
--- a/libavcodec/ac3enc_float.c
+++ b/libavcodec/ac3enc_float.c
@@ -44,6 +44,8 @@ static const AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
 
 /**
  * Finalize MDCT and free allocated memory.
+ *
+ * @param s  AC-3 encoder private context
  */
 av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
 {
@@ -54,7 +56,9 @@ av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
 
 /**
  * Initialize MDCT tables.
- * @param nbits log2(MDCT size)
+ *
+ * @param s  AC-3 encoder private context
+ * @return   0 on success, negative error code on failure
  */
 av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
 {
@@ -78,7 +82,7 @@ av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Apply KBD window to input samples prior to MDCT.
  */
 static void apply_window(DSPContext *dsp, float *output, const float *input,
@@ -88,7 +92,7 @@ static void apply_window(DSPContext *dsp, float *output, const float *input,
 }
 
 
-/**
+/*
  * Normalize the input samples.
  * Not needed for the floating-point encoder.
  */
@@ -98,19 +102,20 @@ static int normalize_samples(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Scale MDCT coefficients from float to 24-bit fixed-point.
  */
 static void scale_coefficients(AC3EncodeContext *s)
 {
     int chan_size = AC3_MAX_COEFS * s->num_blocks;
-    s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + chan_size,
-                               s->mdct_coef_buffer  + chan_size,
-                               chan_size * s->channels);
+    int cpl       = s->cpl_on;
+    s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + (chan_size * !cpl),
+                               s->mdct_coef_buffer  + (chan_size * !cpl),
+                               chan_size * (s->channels + cpl));
 }
 
 
-/**
+/*
  * Clip MDCT coefficients to allowable range.
  */
 static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
@@ -119,16 +124,27 @@ static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
 }
 
 
+/*
+ * Calculate a single coupling coordinate.
+ */
+static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
+{
+    float coord = 0.125;
+    if (energy_cpl > 0)
+        coord *= sqrtf(energy_ch / energy_cpl);
+    return FFMIN(coord, COEF_MAX);
+}
+
+
 #if CONFIG_AC3_ENCODER
 AVCodec ff_ac3_encoder = {
-    "ac3",
-    AVMEDIA_TYPE_AUDIO,
-    CODEC_ID_AC3,
-    sizeof(AC3EncodeContext),
-    ff_ac3_encode_init,
-    ff_ac3_float_encode_frame,
-    ff_ac3_encode_close,
-    NULL,
+    .name           = "ac3",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = CODEC_ID_AC3,
+    .priv_data_size = sizeof(AC3EncodeContext),
+    .init           = ff_ac3_encode_init,
+    .encode         = ff_ac3_float_encode_frame,
+    .close          = ff_ac3_encode_close,
     .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_FLT,AV_SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     .priv_class = &ac3enc_class,