X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fimc.c;h=51e7c1b2e11b2338bac289314f4bb6f55535cce3;hb=7b100839330ace3b4846ee4a1fc5caf4b8f8a34e;hp=70ad5b1dbdcdc398e8c2bba2be98c54886a6e322;hpb=51eda4c394f1b0c1b8aee67b90e10150ddae2f7c;p=ffmpeg

diff --git a/libavcodec/imc.c b/libavcodec/imc.c
index 70ad5b1dbdc..51e7c1b2e11 100644
--- a/libavcodec/imc.c
+++ b/libavcodec/imc.c
@@ -38,6 +38,9 @@
 #include "libavutil/ffmath.h"
 #include "libavutil/float_dsp.h"
 #include "libavutil/internal.h"
+#include "libavutil/mem_internal.h"
+#include "libavutil/thread.h"
+
 #include "avcodec.h"
 #include "bswapdsp.h"
 #include "get_bits.h"
@@ -113,11 +116,6 @@ static VLC huffman_vlc[4][4];
 #define IMC_VLC_BITS 9
 #define VLC_TABLES_SIZE 9512
 
-static const int vlc_offsets[17] = {
-    0,     640, 1156, 1732, 2308, 2852, 3396, 3924,
-    4452, 5220, 5860, 6628, 7268, 7908, 8424, 8936, VLC_TABLES_SIZE
-};
-
 static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2];
 
 static inline double freq2bark(double freq)
@@ -176,10 +174,27 @@ static av_cold void iac_generate_tabs(IMCContext *q, int sampling_rate)
     }
 }
 
+static av_cold void imc_init_static(void)
+{
+    /* initialize the VLC tables */
+    for (int i = 0, offset = 0; i < 4 ; i++) {
+        for (int j = 0; j < 4; j++) {
+            huffman_vlc[i][j].table           = &vlc_tables[offset];
+            huffman_vlc[i][j].table_allocated = VLC_TABLES_SIZE - offset;
+            ff_init_vlc_from_lengths(&huffman_vlc[i][j], IMC_VLC_BITS, imc_huffman_sizes[i],
+                                     imc_huffman_lens[i][j], 1,
+                                     imc_huffman_syms[i][j], 1, 1,
+                                     0, INIT_VLC_STATIC_OVERLONG, NULL);
+            offset += huffman_vlc[i][j].table_size;
+        }
+    }
+}
+
 static av_cold int imc_decode_init(AVCodecContext *avctx)
 {
     int i, j, ret;
     IMCContext *q = avctx->priv_data;
+    static AVOnce init_static_once = AV_ONCE_INIT;
     AVFloatDSPContext *fdsp;
     double r1, r2;
 
@@ -234,17 +249,6 @@ static av_cold int imc_decode_init(AVCodecContext *avctx)
     for (i = 0; i < 30; i++)
         q->sqrt_tab[i] = sqrt(i);
 
-    /* initialize the VLC tables */
-    for (i = 0; i < 4 ; i++) {
-        for (j = 0; j < 4; j++) {
-            huffman_vlc[i][j].table = &vlc_tables[vlc_offsets[i * 4 + j]];
-            huffman_vlc[i][j].table_allocated = vlc_offsets[i * 4 + j + 1] - vlc_offsets[i * 4 + j];
-            init_vlc(&huffman_vlc[i][j], IMC_VLC_BITS, imc_huffman_sizes[i],
-                     imc_huffman_lens[i][j], 1, 1,
-                     imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);
-        }
-    }
-
     if (avctx->codec_id == AV_CODEC_ID_IAC) {
         iac_generate_tabs(q, avctx->sample_rate);
     } else {
@@ -269,6 +273,8 @@ static av_cold int imc_decode_init(AVCodecContext *avctx)
     avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO
                                                  : AV_CH_LAYOUT_STEREO;
 
+    ff_thread_once(&init_static_once, imc_init_static);
+
     return 0;
 }
 
@@ -1088,9 +1094,10 @@ AVCodec ff_imc_decoder = {
     .close          = imc_decode_close,
     .decode         = imc_decode_frame,
     .flush          = flush,
-    .capabilities   = AV_CODEC_CAP_DR1,
+    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
                                                       AV_SAMPLE_FMT_NONE },
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };
 #endif
 #if CONFIG_IAC_DECODER
@@ -1107,5 +1114,6 @@ AVCodec ff_iac_decoder = {
     .capabilities   = AV_CODEC_CAP_DR1,
     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
                                                       AV_SAMPLE_FMT_NONE },
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };
 #endif