3 * Copyright (c) 2002 Fabrice Bellard
4 * Copyright (c) 2004 Roman Shaposhnik
7 * Copyright (c) 2003 Roman Shaposhnik
9 * 50 Mbps (DVCPRO50) support
10 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
12 * 100 Mbps (DVCPRO HD) support
13 * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
14 * Final code by Roman Shaposhnik
16 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
17 * of DV technical info.
19 * This file is part of FFmpeg.
21 * FFmpeg is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Lesser General Public
23 * License as published by the Free Software Foundation; either
24 * version 2.1 of the License, or (at your option) any later version.
26 * FFmpeg is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * Lesser General Public License for more details.
31 * You should have received a copy of the GNU Lesser General Public
32 * License along with FFmpeg; if not, write to the Free Software
33 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
41 #include "libavutil/internal.h"
42 #include "libavutil/pixdesc.h"
47 #include "simple_idct.h"
51 /* XXX: also include quantization */
52 RL_VLC_ELEM ff_dv_rl_vlc[1184];
54 static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan, int seq, int slot,
57 static const uint8_t off[] = { 2, 6, 8, 0, 4 };
58 static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
59 static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
60 static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 };
62 static const uint8_t l_start[] = {0, 4, 9, 13, 18, 22, 27, 31, 36, 40};
63 static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };
65 static const uint8_t serpent1[] = {0, 1, 2, 2, 1, 0,
70 static const uint8_t serpent2[] = {0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
71 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
74 static const uint8_t remap[][2] = {{ 0, 0}, { 0, 0}, { 0, 0}, { 0, 0}, /* dummy */
75 { 0, 0}, { 0, 1}, { 0, 2}, { 0, 3}, {10, 0},
76 {10, 1}, {10, 2}, {10, 3}, {20, 0}, {20, 1},
77 {20, 2}, {20, 3}, {30, 0}, {30, 1}, {30, 2},
78 {30, 3}, {40, 0}, {40, 1}, {40, 2}, {40, 3},
79 {50, 0}, {50, 1}, {50, 2}, {50, 3}, {60, 0},
80 {60, 1}, {60, 2}, {60, 3}, {70, 0}, {70, 1},
81 {70, 2}, {70, 3}, { 0,64}, { 0,65}, { 0,66},
82 {10,64}, {10,65}, {10,66}, {20,64}, {20,65},
83 {20,66}, {30,64}, {30,65}, {30,66}, {40,64},
84 {40,65}, {40,66}, {50,64}, {50,65}, {50,66},
85 {60,64}, {60,65}, {60,66}, {70,64}, {70,65},
86 {70,66}, { 0,67}, {20,67}, {40,67}, {60,67}};
94 blk = (chan*11+seq)*27+slot;
96 if (chan == 0 && seq == 11) {
105 i = (4*chan + blk + off[m])%11;
108 x = shuf1[m] + (chan&1)*9 + k%9;
109 y = (i*3+k/9)*2 + (chan>>1) + 1;
111 tbl[m] = (x<<1)|(y<<9);
114 blk = (chan*10+seq)*27+slot;
116 i = (4*chan + (seq/5) + 2*blk + off[m])%10;
119 x = shuf1[m]+(chan&1)*9 + k%9;
120 y = (i*3+k/9)*2 + (chan>>1) + 4;
123 x = remap[y][0]+((x-80)<<(y>59));
126 tbl[m] = (x<<1)|(y<<9);
129 blk = (chan*10+seq)*27+slot;
131 i = (4*chan + (seq/5) + 2*blk + off[m])%10;
132 k = (blk/5)%27 + (i&1)*3;
134 x = shuf2[m] + k%6 + 6*(chan&1);
135 y = l_start[i] + k/6 + 45*(chan>>1);
136 tbl[m] = (x<<1)|(y<<9);
139 switch (d->pix_fmt) {
140 case AV_PIX_FMT_YUV422P:
141 x = shuf3[m] + slot/3;
143 ((((seq + off[m]) % d->difseg_size)<<1) + chan)*3;
144 tbl[m] = (x<<1)|(y<<8);
146 case AV_PIX_FMT_YUV420P:
147 x = shuf3[m] + slot/3;
149 ((seq + off[m]) % d->difseg_size)*3;
150 tbl[m] = (x<<1)|(y<<9);
152 case AV_PIX_FMT_YUV411P:
153 i = (seq + off[m]) % d->difseg_size;
154 k = slot + ((m==1||m==2)?3:0);
156 x = l_start_shuffled[m] + k/6;
157 y = serpent2[k] + i*6;
160 tbl[m] = (x<<2)|(y<<8);
169 /* quantization quanta by QNO for DV100 */
170 static const uint8_t dv100_qstep[16] = {
171 1, /* QNO = 0 and 1 both have no quantization */
173 2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
176 static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
178 int ff_dv_init_dynamic_tables(DVVideoContext *ctx, const AVDVProfile *d)
181 uint32_t *factor1, *factor2;
182 const int *iweight1, *iweight2;
185 for (c = 0; c < d->n_difchan; c++) {
186 for (s = 0; s < d->difseg_size; s++) {
188 for (j = 0; j < 27; j++) {
190 if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
191 !(DV_PROFILE_IS_720p50(d) && s > 9)) {
192 dv_calc_mb_coordinates(d, c, s, j, &ctx->work_chunks[i].mb_coordinates[0]);
193 ctx->work_chunks[i++].buf_offset = p;
200 factor1 = &ctx->idct_factor[0];
201 factor2 = &ctx->idct_factor[DV_PROFILE_IS_HD(d) ? 4096 : 2816];
202 if (d->height == 720) {
203 iweight1 = &ff_dv_iweight_720_y[0];
204 iweight2 = &ff_dv_iweight_720_c[0];
206 iweight1 = &ff_dv_iweight_1080_y[0];
207 iweight2 = &ff_dv_iweight_1080_c[0];
209 if (DV_PROFILE_IS_HD(d)) {
210 for (c = 0; c < 4; c++) {
211 for (s = 0; s < 16; s++) {
212 for (i = 0; i < 64; i++) {
213 *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];
214 *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];
219 iweight1 = &ff_dv_iweight_88[0];
220 for (j = 0; j < 2; j++, iweight1 = &ff_dv_iweight_248[0]) {
221 for (s = 0; s < 22; s++) {
222 for (i = c = 0; c < 4; c++) {
223 for (; i < dv_quant_areas[c]; i++) {
224 *factor1 = iweight1[i] << (ff_dv_quant_shifts[s][c] + 1);
225 *factor2++ = (*factor1++) << 1;
235 av_cold int ff_dvvideo_init(AVCodecContext *avctx)
237 DVVideoContext *s = avctx->priv_data;
243 uint16_t new_dv_vlc_bits[NB_DV_VLC*2];
244 uint8_t new_dv_vlc_len[NB_DV_VLC*2];
245 uint8_t new_dv_vlc_run[NB_DV_VLC*2];
246 int16_t new_dv_vlc_level[NB_DV_VLC*2];
250 /* it's faster to include sign bit in a generic VLC parsing scheme */
251 for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
252 new_dv_vlc_bits[j] = ff_dv_vlc_bits[i];
253 new_dv_vlc_len[j] = ff_dv_vlc_len[i];
254 new_dv_vlc_run[j] = ff_dv_vlc_run[i];
255 new_dv_vlc_level[j] = ff_dv_vlc_level[i];
257 if (ff_dv_vlc_level[i]) {
258 new_dv_vlc_bits[j] <<= 1;
262 new_dv_vlc_bits[j] = (ff_dv_vlc_bits[i] << 1) | 1;
263 new_dv_vlc_len[j] = ff_dv_vlc_len[i] + 1;
264 new_dv_vlc_run[j] = ff_dv_vlc_run[i];
265 new_dv_vlc_level[j] = -ff_dv_vlc_level[i];
269 /* NOTE: as a trick, we use the fact the no codes are unused
270 to accelerate the parsing of partial codes */
271 init_vlc(&dv_vlc, TEX_VLC_BITS, j,
272 new_dv_vlc_len, 1, 1, new_dv_vlc_bits, 2, 2, 0);
273 av_assert1(dv_vlc.table_size == 1184);
275 for (i = 0; i < dv_vlc.table_size; i++){
276 int code = dv_vlc.table[i][0];
277 int len = dv_vlc.table[i][1];
280 if (len < 0){ //more bits needed
284 run = new_dv_vlc_run [code] + 1;
285 level = new_dv_vlc_level[code];
287 ff_dv_rl_vlc[i].len = len;
288 ff_dv_rl_vlc[i].level = level;
289 ff_dv_rl_vlc[i].run = run;
291 ff_free_vlc(&dv_vlc);
295 avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT;