virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

Use new style static VLC tables for IMC decoder.

Browse Source 
Also fixes a memleak due to the previous in-context tables not being freed.

Originally committed as revision 14182 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2008-07-12 15:02:40 +00:00
parent 9d3b9f2cce
commit 09fec2b929
1 changed files with 17 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
libavcodec/imc.c
View File

@ -79,7 +79,6 @@ typedef struct {
int codewords[COEFFS]; ///< raw codewords read from bitstream
float sqrt_tab[30];
GetBitContext gb;
VLC huffman_vlc[4][4];
int decoder_reset;
float one_div_log2;
@ -89,6 +88,15 @@ typedef struct {
DECLARE_ALIGNED_16(float, out_samples[COEFFS]);
} IMCContext;
static VLC huffman_vlc[4][4];
#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 av_cold int imc_decode_init(AVCodecContext * avctx)
{
@ -135,9 +143,11 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)
/* initialize the VLC tables */
for(i = 0; i < 4 ; i++) {
for(j = 0; j < 4; j++) {
init_vlc (&q->huffman_vlc[i][j], 9, imc_huffman_sizes[i],
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], 9, imc_huffman_sizes[i],
imc_huffman_lens[i][j], 1, 1,
imc_huffman_bits[i][j], 2, 2, 1);
imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);
}
}
q->one_div_log2 = 1/log(2);
@ -210,10 +220,10 @@ static void imc_read_level_coeffs(IMCContext* q, int stream_format_code, int* le
int s;
s = stream_format_code >> 1;
hufftab[0] = &q->huffman_vlc[s][0];
hufftab[1] = &q->huffman_vlc[s][1];
hufftab[2] = &q->huffman_vlc[s][2];
hufftab[3] = &q->huffman_vlc[s][3];
hufftab[0] = &huffman_vlc[s][0];
hufftab[1] = &huffman_vlc[s][1];
hufftab[2] = &huffman_vlc[s][2];
hufftab[3] = &huffman_vlc[s][3];
cb_sel = imc_cb_select[s];
if(stream_format_code & 4)