* Winnov WNV1 codec.
*/
+#include "libavutil/thread.h"
+
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
-
-static const uint16_t code_tab[16][2] = {
- { 0x17F, 9 }, { 0xBF, 8 }, { 0x5F, 7 }, { 0x2F, 6 }, { 0x17, 5 }, { 0x0B, 4 }, { 0x005, 3 },
- { 0x000, 1 },
- { 0x01, 3 }, { 0x03, 4 }, { 0x07, 5 }, { 0x0F, 6 }, { 0x1F, 7 }, { 0x3F, 8 }, { 0x07F, 9 }, { 0xFF, 8 }
+static const uint8_t code_tab[16][2] = {
+ { 7, 1 }, { 8, 3 }, { 6, 3 }, { 9, 4 }, { 5, 4 }, { 10, 5 }, { 4, 5 },
+ { 11, 6 }, { 3, 6 }, { 12, 7 }, { 2, 7 }, { 13, 8 }, { 1, 8 }, { 14, 9 },
+ { 0, 9 }, { 15, 8 }
};
#define CODE_VLC_BITS 9
{
int v = get_vlc2(gb, code_vlc.table, CODE_VLC_BITS, 1);
- if (v == 15)
+ if (v == 8)
return get_bits(gb, 8 - shift) << shift;
else
- return base_value + ((v - 7U) << shift);
+ return base_value + v * (1 << shift);
}
static int decode_frame(AVCodecContext *avctx,
return buf_size;
}
+static av_cold void wnv1_init_static(void)
+{
+ INIT_VLC_STATIC_FROM_LENGTHS(&code_vlc, CODE_VLC_BITS, 16,
+ &code_tab[0][1], 2,
+ &code_tab[0][0], 2, 1,
+ -7, INIT_VLC_OUTPUT_LE, 1 << CODE_VLC_BITS);
+}
+
static av_cold int decode_init(AVCodecContext *avctx)
{
- static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
+ static AVOnce init_static_once = AV_ONCE_INIT;
avctx->pix_fmt = AV_PIX_FMT_YUV422P;
- code_vlc.table = code_table;
- code_vlc.table_allocated = 1 << CODE_VLC_BITS;
- init_vlc(&code_vlc, CODE_VLC_BITS, 16,
- &code_tab[0][1], 4, 2,
- &code_tab[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+ ff_thread_once(&init_static_once, wnv1_init_static);
return 0;
}
.init = decode_init,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};