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avcodec/cfhdenc: optimize writting of small runcodes

This commit is contained in:
Paul B Mahol 2020-08-10 09:35:10 +02:00
parent 16b79f3d3a
commit ba0825626a
1 changed files with 8 additions and 5 deletions
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13
libavcodec/cfhdenc.c
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@ -94,8 +94,11 @@ static const unsigned codebook[256][2] = {
};
/* Derived by extracting runcodes from existing tables from decoder */
static const uint16_t runbook[8][3] = {
{1, 0x0000, 1}, {7, 0x0069, 12}, {8, 0x00D1, 20}, {9, 0x018A, 32},
static const uint16_t runbook[18][3] = {
{1, 0x0000, 1}, {2, 0x0000, 2}, {3, 0x0000, 3}, {4, 0x0000, 4},
{5, 0x0000, 5}, {6, 0x0000, 6}, {7, 0x0000, 7}, {8, 0x0000, 8},
{9, 0x0000, 9}, {10, 0x0000, 10}, {11, 0x0000, 11},
{7, 0x0069, 12}, {8, 0x00D1, 20}, {9, 0x018A, 32},
{10, 0x0343, 60}, {11, 0x0685, 100}, {13, 0x18BF, 180}, {13, 0x1BA5, 320},
};
@ -329,7 +332,7 @@ static av_cold int cfhd_encode_init(AVCodecContext *avctx)
s->rb[0].run = 0;
for (int i = 1, j = 0; i < 320 && j < 7; j++) {
for (int i = 1, j = 0; i < 320 && j < 17; j++) {
int run = runbook[j][2];
int end = runbook[j+1][2];
@ -340,8 +343,8 @@ static av_cold int cfhd_encode_init(AVCodecContext *avctx)
}
}
s->rb[320].bits = runbook[7][1];
s->rb[320].size = runbook[7][0];
s->rb[320].bits = runbook[17][1];
s->rb[320].size = runbook[17][0];
s->rb[320].run = 320;
for (int i = 0; i < 256; i++) {