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simplifying DIF encoding process

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Originally committed as revision 16877 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik 2009-01-31 01:39:05 +00:00
parent 76bd5997a9
commit 85eca52be4
1 changed files with 24 additions and 22 deletions
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46
libavcodec/dv.c
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@ -1001,7 +1001,6 @@ static int dv_encode_video_segment(AVCodecContext *avctx, DVwork_chunk *work_chu
int mb_x, mb_y, c_offset, linesize;
uint8_t* y_ptr;
uint8_t* data;
uint8_t* ptr;
uint8_t* dif;
uint8_t scratch[64];
EncBlockInfo enc_blks[5*DV_MAX_BPM];
@ -1010,17 +1009,16 @@ static int dv_encode_video_segment(AVCodecContext *avctx, DVwork_chunk *work_chu
EncBlockInfo* enc_blk;
int vs_bit_size = 0;
int qnos[5];
int* qnosp = &qnos[0];
dif = &s->buf[work_chunk->buf_offset*80];
enc_blk = &enc_blks[0];
pb = &pbs[0];
for (mb_index = 0; mb_index < 5; mb_index++) {
dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << 3);
c_offset = (((mb_y >> (s->sys->pix_fmt == PIX_FMT_YUV420P)) * s->picture.linesize[1] +
(mb_x >> ((s->sys->pix_fmt == PIX_FMT_YUV411P) ? 2 : 1))) << 3);
qnos[mb_index] = 15; /* No quantization */
ptr = dif + mb_index*80 + 4;
for (j = 0; j < 6; j++) {
if (s->sys->pix_fmt == PIX_FMT_YUV422P) { /* 4:2:2 */
if (j == 0 || j == 2) {
@ -1067,34 +1065,38 @@ static int dv_encode_video_segment(AVCodecContext *avctx, DVwork_chunk *work_chu
vs_bit_size += dv_init_enc_block(enc_blk, data, linesize, s, j>>2);
init_put_bits(pb, ptr, s->sys->block_sizes[j]/8);
put_bits(pb, 9, (uint16_t)(((enc_blk->mb[0] >> 3) - 1024 + 2) >> 2));
put_bits(pb, 1, enc_blk->dct_mode);
put_bits(pb, 2, enc_blk->cno);
++enc_blk;
++pb;
ptr += s->sys->block_sizes[j]/8;
}
}
if (vs_total_ac_bits < vs_bit_size)
dv_guess_qnos(&enc_blks[0], &qnos[0]);
dv_guess_qnos(&enc_blks[0], qnosp);
for (i = 0; i < 5; i++) {
dif[i*80 + 3] = qnos[i];
}
/* DIF encoding process */
for (j=0; j<5*s->sys->bpm;) {
int start_mb = j;
/* First pass over individual cells only */
for (j = 0; j < 5 * s->sys->bpm; j++)
dv_encode_ac(&enc_blks[j], &pbs[j], &pbs[j+1]);
dif[3] = *qnosp++;
dif += 4;
/* Second pass over each MB space */
for (j=0; j<5*s->sys->bpm; j+=s->sys->bpm) {
pb = &pbs[j];
/* First pass over individual cells only */
for (i=0; i<s->sys->bpm; i++, j++) {
int sz = s->sys->block_sizes[i]>>3;
init_put_bits(&pbs[j], dif, sz);
put_bits(&pbs[j], 9, (uint16_t)(((enc_blks[j].mb[0] >> 3) - 1024 + 2) >> 2));
put_bits(&pbs[j], 1, enc_blks[j].dct_mode);
put_bits(&pbs[j], 2, enc_blks[j].cno);
dv_encode_ac(&enc_blks[j], &pbs[j], &pbs[j+1]);
dif += sz;
}
/* Second pass over each MB space */
pb = &pbs[start_mb];
for (i=0; i<s->sys->bpm; i++) {
if (enc_blks[i+j].partial_bit_count)
pb = dv_encode_ac(&enc_blks[i+j], pb, &pbs[j+s->sys->bpm]);
if (enc_blks[start_mb+i].partial_bit_count)
pb = dv_encode_ac(&enc_blks[start_mb+i], pb, &pbs[start_mb+s->sys->bpm]);
}
}