avcodec: Constify AVCodecs

[ffmpeg] / libavcodec / ac3enc_fixed.c

diff --git a/libavcodec/ac3enc_fixed.c b/libavcodec/ac3enc_fixed.c
index b23fc64776d88377c2c014ac337bda3bd174f6cd..fe8607988b06bc5f498371dcb744fe5d5f7e4fb5 100644 (file)
--- a/libavcodec/ac3enc_fixed.c
+++ b/libavcodec/ac3enc_fixed.c
@@ -26,54 +26,22 @@
  * fixed-point AC-3 encoder.
  */
 
+#define AC3ENC_FLOAT 0
 #define FFT_FLOAT 0
-#undef CONFIG_AC3ENC_FLOAT
+#define FFT_FIXED_32 1
 #include "internal.h"
 #include "audiodsp.h"
 #include "ac3enc.h"
 #include "eac3enc.h"
-
-#define AC3ENC_TYPE AC3ENC_TYPE_AC3_FIXED
-#include "ac3enc_opts_template.c"
+#include "kbdwin.h"
 
 static const AVClass ac3enc_class = {
     .class_name = "Fixed-Point AC-3 Encoder",
     .item_name  = av_default_item_name,
-    .option     = ac3_options,
+    .option     = ff_ac3_enc_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
-/*
- * Normalize the input samples to use the maximum available precision.
- * This assumes signed 16-bit input samples.
- */
-static int normalize_samples(AC3EncodeContext *s)
-{
-    int v = s->ac3dsp.ac3_max_msb_abs_int16(s->windowed_samples, AC3_WINDOW_SIZE);
-    v = 14 - av_log2(v);
-    if (v > 0)
-        s->ac3dsp.ac3_lshift_int16(s->windowed_samples, AC3_WINDOW_SIZE, v);
-    /* +6 to right-shift from 31-bit to 25-bit */
-    return v + 6;
-}
-
-
-/*
- * Scale MDCT coefficients to 25-bit signed fixed-point.
- */
-static void scale_coefficients(AC3EncodeContext *s)
-{
-    int blk, ch;
-
-    for (blk = 0; blk < s->num_blocks; blk++) {
-        AC3Block *block = &s->blocks[blk];
-        for (ch = 1; ch <= s->channels; ch++) {
-            s->ac3dsp.ac3_rshift_int32(block->mdct_coef[ch], AC3_MAX_COEFS,
-                                       block->coeff_shift[ch]);
-        }
-    }
-}
-
 static void sum_square_butterfly(AC3EncodeContext *s, int64_t sum[4],
                                  const int32_t *coef0, const int32_t *coef1,
                                  int len)
@@ -115,23 +83,36 @@ static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
  *
  * @param s  AC-3 encoder private context
  */
-av_cold void ff_ac3_fixed_mdct_end(AC3EncodeContext *s)
+static av_cold void ac3_fixed_mdct_end(AC3EncodeContext *s)
 {
     ff_mdct_end(&s->mdct);
 }
 
-
 /**
  * Initialize MDCT tables.
  *
  * @param s  AC-3 encoder private context
  * @return   0 on success, negative error code on failure
  */
-av_cold int ff_ac3_fixed_mdct_init(AC3EncodeContext *s)
+static av_cold int ac3_fixed_mdct_init(AC3EncodeContext *s)
 {
-    int ret = ff_mdct_init(&s->mdct, 9, 0, -1.0);
-    s->mdct_window = ff_ac3_window;
-    return ret;
+    float fwin[AC3_BLOCK_SIZE];
+
+    int32_t *iwin = av_malloc_array(AC3_BLOCK_SIZE, sizeof(*iwin));
+    if (!iwin)
+        return AVERROR(ENOMEM);
+
+    ff_kbd_window_init(fwin, 5.0, AC3_BLOCK_SIZE);
+    for (int i = 0; i < AC3_BLOCK_SIZE; i++)
+        iwin[i] = lrintf(fwin[i] * (1 << 22));
+
+    s->mdct_window = iwin;
+
+    s->fdsp = avpriv_alloc_fixed_dsp(s->avctx->flags & AV_CODEC_FLAG_BITEXACT);
+    if (!s->fdsp)
+        return AVERROR(ENOMEM);
+
+    return ff_mdct_init(&s->mdct, 9, 0, -1.0);
 }
 
 
@@ -139,11 +120,14 @@ static av_cold int ac3_fixed_encode_init(AVCodecContext *avctx)
 {
     AC3EncodeContext *s = avctx->priv_data;
     s->fixed_point = 1;
+    s->mdct_end                = ac3_fixed_mdct_end;
+    s->mdct_init               = ac3_fixed_mdct_init;
+    s->allocate_sample_buffers = allocate_sample_buffers;
     return ff_ac3_encode_init(avctx);
 }
 
 
-AVCodec ff_ac3_fixed_encoder = {
+const AVCodec ff_ac3_fixed_encoder = {
     .name            = "ac3_fixed",
     .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     .type            = AVMEDIA_TYPE_AUDIO,
@@ -152,9 +136,11 @@ AVCodec ff_ac3_fixed_encoder = {
     .init            = ac3_fixed_encode_init,
     .encode2         = ff_ac3_fixed_encode_frame,
     .close           = ff_ac3_encode_close,
-    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P,
+    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32P,
                                                       AV_SAMPLE_FMT_NONE },
     .priv_class      = &ac3enc_class,
+    .caps_internal   = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
+    .supported_samplerates = ff_ac3_sample_rate_tab,
     .channel_layouts = ff_ac3_channel_layouts,
-    .defaults        = ac3_defaults,
+    .defaults        = ff_ac3_enc_defaults,
 };