ac3enc: Add codec-specific options for writing AC-3 metadata.

[ffmpeg.git] / libavcodec / ac3enc_float.c

diff --git a/libavcodec/ac3enc_float.c b/libavcodec/ac3enc_float.c
index 82d806b..19afd27 100644 (file)
--- a/libavcodec/ac3enc_float.c
+++ b/libavcodec/ac3enc_float.c
@@ -4,20 +4,20 @@
  * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
  * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -28,6 +28,7 @@
 
 #define CONFIG_AC3ENC_FLOAT 1
 #include "ac3enc.c"
+#include "kbdwin.h"
 
 
 /**
@@ -48,17 +49,19 @@ static av_cold int mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
                              int nbits)
 {
     float *window;
-    int n, n2;
+    int i, n, n2;
 
     n  = 1 << nbits;
     n2 = n >> 1;
 
-    window = av_malloc(n2 * sizeof(*window));
+    window = av_malloc(n * sizeof(*window));
     if (!window) {
         av_log(avctx, AV_LOG_ERROR, "Cannot allocate memory.\n");
         return AVERROR(ENOMEM);
     }
     ff_kbd_window_init(window, 5.0, n2);
+    for (i = 0; i < n2; i++)
+        window[n-1-i] = window[i];
     mdct->window = window;
 
     return ff_mdct_init(&mdct->fft, nbits, 0, -2.0 / n);
@@ -72,23 +75,17 @@ static av_cold int mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
  */
 static void mdct512(AC3MDCTContext *mdct, float *out, float *in)
 {
-    ff_mdct_calc(&mdct->fft, out, in);
+    mdct->fft.mdct_calc(&mdct->fft, out, in);
 }
 
 
 /**
  * Apply KBD window to input samples prior to MDCT.
  */
-static void apply_window(float *output, const float *input,
-                         const float *window, int n)
+static void apply_window(DSPContext *dsp, float *output, const float *input,
+                         const float *window, unsigned int len)
 {
-    int i;
-    int n2 = n >> 1;
-
-    for (i = 0; i < n2; i++) {
-        output[i]     = input[i]     * window[i];
-        output[n-i-1] = input[n-i-1] * window[i];
-    }
+    dsp->vector_fmul(output, input, window, len);
 }
 
 
@@ -102,7 +99,17 @@ static int normalize_samples(AC3EncodeContext *s)
 }
 
 
-AVCodec ac3_encoder = {
+/**
+ * Scale MDCT coefficients from float to 24-bit fixed-point.
+ */
+static void scale_coefficients(AC3EncodeContext *s)
+{
+    s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer, s->mdct_coef_buffer,
+                               AC3_MAX_COEFS * AC3_MAX_BLOCKS * s->channels);
+}
+
+
+AVCodec ff_ac3_encoder = {
     "ac3",
     AVMEDIA_TYPE_AUDIO,
     CODEC_ID_AC3,
@@ -113,5 +120,6 @@ AVCodec ac3_encoder = {
     NULL,
     .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,
     .channel_layouts = ac3_channel_layouts,
 };