static av_always_inline void dnxhd_encode_dc(DNXHDEncContext *ctx, int diff)
{
int nbits;
if (diff < 0) {
nbits = av_log2_16bit(-2*diff);
diff--;
} else {
nbits = av_log2_16bit(2*diff);
}
put_bits(&ctx->m.pb, ctx->cid_table->dc_bits[nbits] + nbits,
(ctx->cid_table->dc_codes[nbits]<<nbits) + (diff & ((1 << nbits) - 1)));
}
/**
* \param s pointer to MpegEncContext structure
* \param block pointer to the DCT block to emit
* \param n
*
* This routine is a duplicate of encode_block in mjpeg.c
*/
static void encode_block(MpegEncContext *s, int16_t *block, int n) {
int mant, nbits, code, i, j;
int component, dc, run, last_index, val;
MJpegContext *m = s->mjpeg_ctx;
uint8_t *huff_size_ac;
uint16_t *huff_code_ac;
/* DC coef */
component = (n <= 3 ? 0 : n - 4 + 1);
dc = block[0]; /* overflow is impossible */
val = dc - s->last_dc[component];
if (n < 4) {
encode_dc(s, val, m->huff_size_dc_luminance,
m->huff_code_dc_luminance);
huff_size_ac = m->huff_size_ac_luminance;
huff_code_ac = m->huff_code_ac_luminance;
} else {
encode_dc(s, val, m->huff_size_dc_chrominance,
m->huff_code_dc_chrominance);
huff_size_ac = m->huff_size_ac_chrominance;
huff_code_ac = m->huff_code_ac_chrominance;
}
s->last_dc[component] = dc;
/* AC coefs */
run = 0;
last_index = s->block_last_index[n];
for (i = 1; i <= last_index; i++) {
j = s->intra_scantable.permutated[i];
val = block[j];
if (val == 0) run++;
else {
while (run >= 16) {
put_bits(&s->pb, huff_size_ac[0xf0],
huff_code_ac[0xf0]);
run -= 16;
}
mant = val;
if (val < 0) {
val = -val;
mant--;
}
nbits= av_log2_16bit(val) + 1;
code = (run << 4) | nbits;
put_bits(&s->pb, huff_size_ac[code],
huff_code_ac[code]);
put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
run = 0;
}
}
/* output EOB only if not already 64 values */
if (last_index < 63 || run != 0)
put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
}
/**
* This routine is only intended to be used from encode_block
*
* \param s pointer to MpegEncContext structure
* \param val the DC value to emit
* \param huff_size pointer to huffman code size array
* \param huff_code pointer to the code array corresponding to \a huff_size
*
* This routine is a clone of mjpeg_encode_dc
*/
static inline void encode_dc(MpegEncContext *s, int val,
uint8_t *huff_size, uint16_t *huff_code) {
int mant, nbits;
if (val == 0) {
put_bits(&s->pb, huff_size[0], huff_code[0]);
} else {
mant = val;
if (val < 0) {
val = -val;
mant--;
}
nbits= av_log2_16bit(val) + 1;
put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
}
}
