| /* |
| * DV decoder |
| * Copyright (c) 2002 Fabrice Bellard |
| * Copyright (c) 2004 Roman Shaposhnik |
| * |
| * DV encoder |
| * Copyright (c) 2003 Roman Shaposhnik |
| * |
| * 50 Mbps (DVCPRO50) support |
| * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com> |
| * |
| * 100 Mbps (DVCPRO HD) support |
| * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D) |
| * Final code by Roman Shaposhnik |
| * |
| * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth |
| * of DV technical info. |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * DV codec. |
| */ |
| |
| #include "libavutil/internal.h" |
| #include "libavutil/pixdesc.h" |
| |
| #include "avcodec.h" |
| #include "dv.h" |
| #include "dvdata.h" |
| #include "internal.h" |
| #include "put_bits.h" |
| #include "simple_idct.h" |
| |
| /* XXX: also include quantization */ |
| RL_VLC_ELEM ff_dv_rl_vlc[1664]; |
| |
| static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan, |
| int seq, int slot, uint16_t *tbl) |
| { |
| static const uint8_t off[] = { 2, 6, 8, 0, 4 }; |
| static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 }; |
| static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 }; |
| static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 }; |
| |
| static const uint8_t l_start[] = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 }; |
| static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 }; |
| |
| static const uint8_t serpent1[] = { |
| 0, 1, 2, 2, 1, 0, |
| 0, 1, 2, 2, 1, 0, |
| 0, 1, 2, 2, 1, 0, |
| 0, 1, 2, 2, 1, 0, |
| 0, 1, 2 |
| }; |
| static const uint8_t serpent2[] = { |
| 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0, |
| 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0, |
| 0, 1, 2, 3, 4, 5 |
| }; |
| |
| static const uint8_t remap[][2] = { |
| { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, /* dummy */ |
| { 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 }, { 10, 0 }, |
| { 10, 1 }, { 10, 2 }, { 10, 3 }, { 20, 0 }, { 20, 1 }, |
| { 20, 2 }, { 20, 3 }, { 30, 0 }, { 30, 1 }, { 30, 2 }, |
| { 30, 3 }, { 40, 0 }, { 40, 1 }, { 40, 2 }, { 40, 3 }, |
| { 50, 0 }, { 50, 1 }, { 50, 2 }, { 50, 3 }, { 60, 0 }, |
| { 60, 1 }, { 60, 2 }, { 60, 3 }, { 70, 0 }, { 70, 1 }, |
| { 70, 2 }, { 70, 3 }, { 0, 64 }, { 0, 65 }, { 0, 66 }, |
| { 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 }, |
| { 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 }, |
| { 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 }, |
| { 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 }, |
| { 70, 66 }, { 0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 } |
| }; |
| |
| int i, k, m; |
| int x, y, blk; |
| |
| for (m = 0; m < 5; m++) { |
| switch (d->width) { |
| case 1440: |
| blk = (chan * 11 + seq) * 27 + slot; |
| |
| if (chan == 0 && seq == 11) { |
| x = m * 27 + slot; |
| if (x < 90) { |
| y = 0; |
| } else { |
| x = (x - 90) * 2; |
| y = 67; |
| } |
| } else { |
| i = (4 * chan + blk + off[m]) % 11; |
| k = (blk / 11) % 27; |
| |
| x = shuf1[m] + (chan & 1) * 9 + k % 9; |
| y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1; |
| } |
| tbl[m] = (x << 1) | (y << 9); |
| break; |
| case 1280: |
| blk = (chan * 10 + seq) * 27 + slot; |
| |
| i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10; |
| k = (blk / 5) % 27; |
| |
| x = shuf1[m] + (chan & 1) * 9 + k % 9; |
| y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4; |
| |
| if (x >= 80) { |
| x = remap[y][0] + ((x - 80) << (y > 59)); |
| y = remap[y][1]; |
| } |
| tbl[m] = (x << 1) | (y << 9); |
| break; |
| case 960: |
| blk = (chan * 10 + seq) * 27 + slot; |
| |
| i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10; |
| k = (blk / 5) % 27 + (i & 1) * 3; |
| |
| x = shuf2[m] + k % 6 + 6 * (chan & 1); |
| y = l_start[i] + k / 6 + 45 * (chan >> 1); |
| tbl[m] = (x << 1) | (y << 9); |
| break; |
| case 720: |
| switch (d->pix_fmt) { |
| case AV_PIX_FMT_YUV422P: |
| x = shuf3[m] + slot / 3; |
| y = serpent1[slot] + |
| ((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3; |
| tbl[m] = (x << 1) | (y << 8); |
| break; |
| case AV_PIX_FMT_YUV420P: |
| x = shuf3[m] + slot / 3; |
| y = serpent1[slot] + |
| ((seq + off[m]) % d->difseg_size) * 3; |
| tbl[m] = (x << 1) | (y << 9); |
| break; |
| case AV_PIX_FMT_YUV411P: |
| i = (seq + off[m]) % d->difseg_size; |
| k = slot + ((m == 1 || m == 2) ? 3 : 0); |
| |
| x = l_start_shuffled[m] + k / 6; |
| y = serpent2[k] + i * 6; |
| if (x > 21) |
| y = y * 2 - i * 6; |
| tbl[m] = (x << 2) | (y << 8); |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| } |
| |
| int ff_dv_init_dynamic_tables(DVVideoContext *ctx, const AVDVProfile *d) |
| { |
| int j, i, c, s, p; |
| |
| p = i = 0; |
| for (c = 0; c < d->n_difchan; c++) { |
| for (s = 0; s < d->difseg_size; s++) { |
| p += 6; |
| for (j = 0; j < 27; j++) { |
| p += !(j % 3); |
| if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) && |
| !(DV_PROFILE_IS_720p50(d) && s > 9)) { |
| dv_calc_mb_coordinates(d, c, s, j, &ctx->work_chunks[i].mb_coordinates[0]); |
| ctx->work_chunks[i++].buf_offset = p; |
| } |
| p += 5; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| av_cold int ff_dvvideo_init(AVCodecContext *avctx) |
| { |
| DVVideoContext *s = avctx->priv_data; |
| static int done = 0; |
| int i, j; |
| |
| if (!done) { |
| VLC dv_vlc; |
| uint16_t new_dv_vlc_bits[NB_DV_VLC * 2]; |
| uint8_t new_dv_vlc_len[NB_DV_VLC * 2]; |
| uint8_t new_dv_vlc_run[NB_DV_VLC * 2]; |
| int16_t new_dv_vlc_level[NB_DV_VLC * 2]; |
| |
| done = 1; |
| |
| /* it's faster to include sign bit in a generic VLC parsing scheme */ |
| for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) { |
| new_dv_vlc_bits[j] = ff_dv_vlc_bits[i]; |
| new_dv_vlc_len[j] = ff_dv_vlc_len[i]; |
| new_dv_vlc_run[j] = ff_dv_vlc_run[i]; |
| new_dv_vlc_level[j] = ff_dv_vlc_level[i]; |
| |
| if (ff_dv_vlc_level[i]) { |
| new_dv_vlc_bits[j] <<= 1; |
| new_dv_vlc_len[j]++; |
| |
| j++; |
| new_dv_vlc_bits[j] = (ff_dv_vlc_bits[i] << 1) | 1; |
| new_dv_vlc_len[j] = ff_dv_vlc_len[i] + 1; |
| new_dv_vlc_run[j] = ff_dv_vlc_run[i]; |
| new_dv_vlc_level[j] = -ff_dv_vlc_level[i]; |
| } |
| } |
| |
| /* NOTE: as a trick, we use the fact the no codes are unused |
| * to accelerate the parsing of partial codes */ |
| init_vlc(&dv_vlc, TEX_VLC_BITS, j, new_dv_vlc_len, |
| 1, 1, new_dv_vlc_bits, 2, 2, 0); |
| av_assert1(dv_vlc.table_size == 1664); |
| |
| for (i = 0; i < dv_vlc.table_size; i++) { |
| int code = dv_vlc.table[i][0]; |
| int len = dv_vlc.table[i][1]; |
| int level, run; |
| |
| if (len < 0) { // more bits needed |
| run = 0; |
| level = code; |
| } else { |
| run = new_dv_vlc_run[code] + 1; |
| level = new_dv_vlc_level[code]; |
| } |
| ff_dv_rl_vlc[i].len = len; |
| ff_dv_rl_vlc[i].level = level; |
| ff_dv_rl_vlc[i].run = run; |
| } |
| ff_free_vlc(&dv_vlc); |
| } |
| |
| s->avctx = avctx; |
| avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; |
| |
| return 0; |
| } |
| |
