1025 lines
31 KiB
C
1025 lines
31 KiB
C
/*
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* DV decoder
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* Copyright (c) 2002 Fabrice Bellard.
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*
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* DV encoder
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* Copyright (c) 2003 Roman Shaposhnik.
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*
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* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
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* of DV technical info.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file dv.c
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* DV codec.
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "simple_idct.h"
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#include "dvdata.h"
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typedef struct DVVideoDecodeContext {
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const DVprofile* sys;
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AVFrame picture;
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uint8_t dv_zigzag[2][64];
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uint8_t dv_idct_shift[2][22][64];
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void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
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void (*fdct[2])(DCTELEM *block);
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void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
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GetBitContext gb;
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DCTELEM block[5*6][64] __align8;
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} DVVideoDecodeContext;
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#define TEX_VLC_BITS 9
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#ifdef DV_CODEC_TINY_TARGET
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#define DV_VLC_MAP_RUN_SIZE 15
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#define DV_VLC_MAP_LEV_SIZE 23
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#else
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#define DV_VLC_MAP_RUN_SIZE 64
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#define DV_VLC_MAP_LEV_SIZE 512
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#endif
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/* XXX: also include quantization */
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static RL_VLC_ELEM *dv_rl_vlc[1];
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/* VLC encoding lookup table */
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static struct dv_vlc_pair {
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uint32_t vlc;
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uint8_t size;
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} (*dv_vlc_map)[DV_VLC_MAP_LEV_SIZE] = NULL;
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static void dv_build_unquantize_tables(DVVideoDecodeContext *s, uint8_t* perm)
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{
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int i, q, j;
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/* NOTE: max left shift is 6 */
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for(q = 0; q < 22; q++) {
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/* 88DCT */
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for(i = 1; i < 64; i++) {
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/* 88 table */
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j = perm[i];
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s->dv_idct_shift[0][q][j] =
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dv_quant_shifts[q][dv_88_areas[i]] + 1;
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}
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/* 248DCT */
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for(i = 1; i < 64; i++) {
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/* 248 table */
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s->dv_idct_shift[1][q][i] =
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dv_quant_shifts[q][dv_248_areas[i]] + 1;
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}
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}
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}
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static int dvvideo_init(AVCodecContext *avctx)
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{
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DVVideoDecodeContext *s = avctx->priv_data;
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DSPContext dsp;
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static int done=0;
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int i, j;
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if (!done) {
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int i;
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VLC dv_vlc;
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done = 1;
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dv_vlc_map = av_mallocz(DV_VLC_MAP_LEV_SIZE*DV_VLC_MAP_RUN_SIZE*sizeof(struct dv_vlc_pair));
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if (!dv_vlc_map)
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return -ENOMEM;
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/* NOTE: as a trick, we use the fact the no codes are unused
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to accelerate the parsing of partial codes */
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init_vlc(&dv_vlc, TEX_VLC_BITS, NB_DV_VLC,
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dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2);
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dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));
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if (!dv_rl_vlc[0]) {
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av_free(dv_vlc_map);
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return -ENOMEM;
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}
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for(i = 0; i < dv_vlc.table_size; i++){
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int code= dv_vlc.table[i][0];
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int len = dv_vlc.table[i][1];
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int level, run;
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if(len<0){ //more bits needed
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run= 0;
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level= code;
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} else if (code == (NB_DV_VLC - 1)) {
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/* EOB */
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run = 0;
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level = 256;
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} else {
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run= dv_vlc_run[code] + 1;
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level= dv_vlc_level[code];
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}
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dv_rl_vlc[0][i].len = len;
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dv_rl_vlc[0][i].level = level;
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dv_rl_vlc[0][i].run = run;
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}
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for (i = 0; i < NB_DV_VLC - 1; i++) {
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if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE || dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
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continue;
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if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
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continue;
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dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc = dv_vlc_bits[i] <<
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(!!dv_vlc_level[i]);
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dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size = dv_vlc_len[i] +
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(!!dv_vlc_level[i]);
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}
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for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
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#ifdef DV_CODEC_TINY_TARGET
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for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
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if (dv_vlc_map[i][j].size == 0) {
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dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
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(dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
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dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
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dv_vlc_map[0][j].size;
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}
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}
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#else
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for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
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if (dv_vlc_map[i][j].size == 0) {
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dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
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(dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
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dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
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dv_vlc_map[0][j].size;
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}
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dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
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dv_vlc_map[i][j].vlc | 1;
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dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
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dv_vlc_map[i][j].size;
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}
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#endif
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}
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}
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/* Generic DSP setup */
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dsputil_init(&dsp, avctx);
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s->get_pixels = dsp.get_pixels;
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/* 88DCT setup */
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s->fdct[0] = dsp.fdct;
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s->idct_put[0] = dsp.idct_put;
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for (i=0; i<64; i++)
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s->dv_zigzag[0][i] = dsp.idct_permutation[ff_zigzag_direct[i]];
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/* 248DCT setup */
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s->fdct[1] = dsp.fdct248;
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s->idct_put[1] = simple_idct248_put; // FIXME: need to add it to DSP
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memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
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/* XXX: do it only for constant case */
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dv_build_unquantize_tables(s, dsp.idct_permutation);
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/* FIXME: I really don't think this should be here */
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if (dv_codec_profile(avctx))
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avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt;
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avctx->coded_frame = &s->picture;
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return 0;
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}
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// #define VLC_DEBUG
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typedef struct BlockInfo {
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const uint8_t *shift_table;
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const uint8_t *scan_table;
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uint8_t pos; /* position in block */
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uint8_t eob_reached; /* true if EOB has been reached */
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uint8_t dct_mode;
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uint8_t partial_bit_count;
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uint16_t partial_bit_buffer;
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int shift_offset;
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} BlockInfo;
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/* block size in bits */
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static const uint16_t block_sizes[6] = {
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112, 112, 112, 112, 80, 80
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};
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/* bit budget for AC only in 5 MBs */
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static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5;
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/* see dv_88_areas and dv_248_areas for details */
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static const int mb_area_start[5] = { 1, 6, 21, 43, 64 };
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#ifndef ALT_BITSTREAM_READER
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#warning only works with ALT_BITSTREAM_READER
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#endif
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/* decode ac coefs */
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static void dv_decode_ac(DVVideoDecodeContext *s,
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BlockInfo *mb, DCTELEM *block, int last_index)
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{
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int last_re_index;
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int shift_offset = mb->shift_offset;
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const uint8_t *scan_table = mb->scan_table;
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const uint8_t *shift_table = mb->shift_table;
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int pos = mb->pos;
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int level, pos1, sign, run;
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int partial_bit_count;
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#ifndef ALT_BITSTREAM_READER //FIXME
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int re_index=0;
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int re1_index=0;
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#endif
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OPEN_READER(re, &s->gb);
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#ifdef VLC_DEBUG
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printf("start\n");
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#endif
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/* if we must parse a partial vlc, we do it here */
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partial_bit_count = mb->partial_bit_count;
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if (partial_bit_count > 0) {
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uint8_t buf[4];
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uint32_t v;
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int l, l1;
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GetBitContext gb1;
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/* build the dummy bit buffer */
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l = 16 - partial_bit_count;
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UPDATE_CACHE(re, &s->gb);
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#ifdef VLC_DEBUG
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printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));
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#endif
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v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);
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buf[0] = v >> 8;
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buf[1] = v;
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#ifdef VLC_DEBUG
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printf("v=%04x cnt=%d %04x\n",
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v, partial_bit_count, (mb->partial_bit_buffer << l));
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#endif
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/* try to read the codeword */
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init_get_bits(&gb1, buf, 4*8);
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{
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OPEN_READER(re1, &gb1);
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UPDATE_CACHE(re1, &gb1);
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GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0],
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TEX_VLC_BITS, 2);
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l = re1_index;
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CLOSE_READER(re1, &gb1);
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}
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#ifdef VLC_DEBUG
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printf("****run=%d level=%d size=%d\n", run, level, l);
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#endif
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/* compute codeword length */
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l1 = (level != 256 && level != 0);
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/* if too long, we cannot parse */
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l -= partial_bit_count;
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if ((re_index + l + l1) > last_index)
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return;
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/* skip read bits */
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last_re_index = 0; /* avoid warning */
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re_index += l;
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/* by definition, if we can read the vlc, all partial bits
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will be read (otherwise we could have read the vlc before) */
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mb->partial_bit_count = 0;
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UPDATE_CACHE(re, &s->gb);
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goto handle_vlc;
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}
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/* get the AC coefficients until last_index is reached */
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for(;;) {
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UPDATE_CACHE(re, &s->gb);
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#ifdef VLC_DEBUG
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printf("%2d: bits=%04x index=%d\n",
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pos, SHOW_UBITS(re, &s->gb, 16), re_index);
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#endif
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last_re_index = re_index;
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GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0],
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TEX_VLC_BITS, 2);
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handle_vlc:
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#ifdef VLC_DEBUG
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printf("run=%d level=%d\n", run, level);
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#endif
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if (level == 256) {
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if (re_index > last_index) {
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cannot_read:
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/* put position before read code */
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re_index = last_re_index;
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mb->eob_reached = 0;
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break;
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}
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/* EOB */
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mb->eob_reached = 1;
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break;
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} else if (level != 0) {
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if ((re_index + 1) > last_index)
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goto cannot_read;
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sign = SHOW_SBITS(re, &s->gb, 1);
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level = (level ^ sign) - sign;
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LAST_SKIP_BITS(re, &s->gb, 1);
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pos += run;
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/* error */
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if (pos >= 64) {
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goto read_error;
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}
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pos1 = scan_table[pos];
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level = level << (shift_table[pos1] + shift_offset);
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block[pos1] = level;
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// printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);
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} else {
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if (re_index > last_index)
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goto cannot_read;
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/* level is zero: means run without coding. No
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sign is coded */
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pos += run;
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/* error */
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if (pos >= 64) {
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read_error:
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#if defined(VLC_DEBUG) || 1
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av_log(NULL, AV_LOG_ERROR, "error pos=%d\n", pos);
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#endif
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/* for errors, we consider the eob is reached */
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mb->eob_reached = 1;
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break;
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}
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}
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}
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CLOSE_READER(re, &s->gb);
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mb->pos = pos;
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}
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static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)
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{
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while (bits_left >= 16) {
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put_bits(pb, 16, get_bits(gb, 16));
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bits_left -= 16;
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}
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if (bits_left > 0) {
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put_bits(pb, bits_left, get_bits(gb, bits_left));
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}
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}
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/* mb_x and mb_y are in units of 8 pixels */
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static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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uint8_t *buf_ptr1,
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const uint16_t *mb_pos_ptr)
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{
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int quant, dc, dct_mode, class1, j;
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int mb_index, mb_x, mb_y, v, last_index;
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DCTELEM *block, *block1;
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int c_offset, bits_left;
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uint8_t *y_ptr;
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BlockInfo mb_data[5 * 6], *mb, *mb1;
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void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
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uint8_t *buf_ptr;
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PutBitContext pb, vs_pb;
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uint8_t mb_bit_buffer[80 + 4]; /* allow some slack */
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int mb_bit_count;
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uint8_t vs_bit_buffer[5 * 80 + 4]; /* allow some slack */
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int vs_bit_count;
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memset(s->block, 0, sizeof(s->block));
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/* pass 1 : read DC and AC coefficients in blocks */
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buf_ptr = buf_ptr1;
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block1 = &s->block[0][0];
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mb1 = mb_data;
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init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
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vs_bit_count = 0;
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for(mb_index = 0; mb_index < 5; mb_index++) {
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/* skip header */
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quant = buf_ptr[3] & 0x0f;
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buf_ptr += 4;
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init_put_bits(&pb, mb_bit_buffer, 80);
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mb_bit_count = 0;
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mb = mb1;
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block = block1;
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for(j = 0;j < 6; j++) {
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/* NOTE: size is not important here */
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init_get_bits(&s->gb, buf_ptr, 14*8);
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|
|
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/* get the dc */
|
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dc = get_bits(&s->gb, 9);
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dc = (dc << (32 - 9)) >> (32 - 9);
|
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dct_mode = get_bits1(&s->gb);
|
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mb->dct_mode = dct_mode;
|
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mb->scan_table = s->dv_zigzag[dct_mode];
|
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class1 = get_bits(&s->gb, 2);
|
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mb->shift_offset = (class1 == 3);
|
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mb->shift_table = s->dv_idct_shift[dct_mode]
|
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[quant + dv_quant_offset[class1]];
|
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dc = dc << 2;
|
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/* convert to unsigned because 128 is not added in the
|
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standard IDCT */
|
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dc += 1024;
|
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block[0] = dc;
|
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last_index = block_sizes[j];
|
|
buf_ptr += last_index >> 3;
|
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mb->pos = 0;
|
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mb->partial_bit_count = 0;
|
|
|
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#ifdef VLC_DEBUG
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printf("MB block: %d, %d ", mb_index, j);
|
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#endif
|
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dv_decode_ac(s, mb, block, last_index);
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|
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/* write the remaining bits in a new buffer only if the
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block is finished */
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bits_left = last_index - get_bits_count(&s->gb);
|
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if (mb->eob_reached) {
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mb->partial_bit_count = 0;
|
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mb_bit_count += bits_left;
|
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bit_copy(&pb, &s->gb, bits_left);
|
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} else {
|
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/* should be < 16 bits otherwise a codeword could have
|
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been parsed */
|
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mb->partial_bit_count = bits_left;
|
|
mb->partial_bit_buffer = get_bits(&s->gb, bits_left);
|
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}
|
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block += 64;
|
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mb++;
|
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}
|
|
|
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flush_put_bits(&pb);
|
|
|
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/* pass 2 : we can do it just after */
|
|
#ifdef VLC_DEBUG
|
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printf("***pass 2 size=%d MB#=%d\n", mb_bit_count, mb_index);
|
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#endif
|
|
block = block1;
|
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mb = mb1;
|
|
init_get_bits(&s->gb, mb_bit_buffer, 80*8);
|
|
for(j = 0;j < 6; j++) {
|
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if (!mb->eob_reached && get_bits_count(&s->gb) < mb_bit_count) {
|
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dv_decode_ac(s, mb, block, mb_bit_count);
|
|
/* if still not finished, no need to parse other blocks */
|
|
if (!mb->eob_reached) {
|
|
/* we could not parse the current AC coefficient,
|
|
so we add the remaining bytes */
|
|
bits_left = mb_bit_count - get_bits_count(&s->gb);
|
|
if (bits_left > 0) {
|
|
mb->partial_bit_count += bits_left;
|
|
mb->partial_bit_buffer =
|
|
(mb->partial_bit_buffer << bits_left) |
|
|
get_bits(&s->gb, bits_left);
|
|
}
|
|
goto next_mb;
|
|
}
|
|
}
|
|
block += 64;
|
|
mb++;
|
|
}
|
|
/* all blocks are finished, so the extra bytes can be used at
|
|
the video segment level */
|
|
bits_left = mb_bit_count - get_bits_count(&s->gb);
|
|
vs_bit_count += bits_left;
|
|
bit_copy(&vs_pb, &s->gb, bits_left);
|
|
next_mb:
|
|
mb1 += 6;
|
|
block1 += 6 * 64;
|
|
}
|
|
|
|
/* we need a pass other the whole video segment */
|
|
flush_put_bits(&vs_pb);
|
|
|
|
#ifdef VLC_DEBUG
|
|
printf("***pass 3 size=%d\n", vs_bit_count);
|
|
#endif
|
|
block = &s->block[0][0];
|
|
mb = mb_data;
|
|
init_get_bits(&s->gb, vs_bit_buffer, 5 * 80*8);
|
|
for(mb_index = 0; mb_index < 5; mb_index++) {
|
|
for(j = 0;j < 6; j++) {
|
|
if (!mb->eob_reached) {
|
|
#ifdef VLC_DEBUG
|
|
printf("start %d:%d\n", mb_index, j);
|
|
#endif
|
|
dv_decode_ac(s, mb, block, vs_bit_count);
|
|
}
|
|
block += 64;
|
|
mb++;
|
|
}
|
|
}
|
|
|
|
/* compute idct and place blocks */
|
|
block = &s->block[0][0];
|
|
mb = mb_data;
|
|
for(mb_index = 0; mb_index < 5; mb_index++) {
|
|
v = *mb_pos_ptr++;
|
|
mb_x = v & 0xff;
|
|
mb_y = v >> 8;
|
|
y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);
|
|
if (s->sys->pix_fmt == PIX_FMT_YUV411P)
|
|
c_offset = (mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8);
|
|
else
|
|
c_offset = ((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8);
|
|
for(j = 0;j < 6; j++) {
|
|
idct_put = s->idct_put[mb->dct_mode];
|
|
if (j < 4) {
|
|
if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
|
|
/* NOTE: at end of line, the macroblock is handled as 420 */
|
|
idct_put(y_ptr + (j * 8), s->picture.linesize[0], block);
|
|
} else {
|
|
idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]),
|
|
s->picture.linesize[0], block);
|
|
}
|
|
} else {
|
|
if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
|
|
uint64_t aligned_pixels[64/8];
|
|
uint8_t *pixels= (uint8_t*)aligned_pixels;
|
|
uint8_t *c_ptr, *c_ptr1, *ptr;
|
|
int y, linesize;
|
|
/* NOTE: at end of line, the macroblock is handled as 420 */
|
|
idct_put(pixels, 8, block);
|
|
linesize = s->picture.linesize[6 - j];
|
|
c_ptr = s->picture.data[6 - j] + c_offset;
|
|
ptr = pixels;
|
|
for(y = 0;y < 8; y++) {
|
|
/* convert to 411P */
|
|
c_ptr1 = c_ptr + 8*linesize;
|
|
c_ptr[0]= ptr[0]; c_ptr1[0]= ptr[4];
|
|
c_ptr[1]= ptr[1]; c_ptr1[1]= ptr[5];
|
|
c_ptr[2]= ptr[2]; c_ptr1[2]= ptr[6];
|
|
c_ptr[3]= ptr[3]; c_ptr1[3]= ptr[7];
|
|
c_ptr += linesize;
|
|
ptr += 8;
|
|
}
|
|
} else {
|
|
/* don't ask me why they inverted Cb and Cr ! */
|
|
idct_put(s->picture.data[6 - j] + c_offset,
|
|
s->picture.linesize[6 - j], block);
|
|
}
|
|
}
|
|
block += 64;
|
|
mb++;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DV_CODEC_TINY_TARGET
|
|
/* Converts run and level (where level != 0) pair into vlc, returning bit size */
|
|
static always_inline int dv_rl2vlc(int run, int l, uint32_t* vlc)
|
|
{
|
|
int sign = l >> 8;
|
|
int level = (l ^ sign) - sign;
|
|
int size;
|
|
|
|
sign = (sign & 1);
|
|
|
|
if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
|
|
*vlc = dv_vlc_map[run][level].vlc | sign;
|
|
size = dv_vlc_map[run][level].size;
|
|
}
|
|
else {
|
|
if (level < DV_VLC_MAP_LEV_SIZE) {
|
|
*vlc = dv_vlc_map[0][level].vlc | sign;
|
|
size = dv_vlc_map[0][level].size;
|
|
} else {
|
|
*vlc = 0xfe00 | (level << 1) | sign;
|
|
size = 16;
|
|
}
|
|
if (run) {
|
|
*vlc |= ((run < 16) ? dv_vlc_map[run-1][0].vlc :
|
|
(0x1f80 | (run - 1))) << size;
|
|
size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static always_inline int dv_rl2vlc_size(int run, int l)
|
|
{
|
|
int level = (l ^ (l >> 8)) - (l >> 8);
|
|
int size;
|
|
|
|
if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
|
|
size = dv_vlc_map[run][level].size;
|
|
}
|
|
else {
|
|
size = (level < DV_VLC_MAP_LEV_SIZE) ? dv_vlc_map[0][level].size : 16;
|
|
if (run) {
|
|
size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
#else
|
|
static always_inline int dv_rl2vlc(int run, int l, uint32_t* vlc)
|
|
{
|
|
*vlc = dv_vlc_map[run][((uint16_t)l)&0x1ff].vlc;
|
|
return dv_vlc_map[run][((uint16_t)l)&0x1ff].size;
|
|
}
|
|
|
|
static always_inline int dv_rl2vlc_size(int run, int l)
|
|
{
|
|
return dv_vlc_map[run][((uint16_t)l)&0x1ff].size;
|
|
}
|
|
#endif
|
|
|
|
typedef struct EncBlockInfo {
|
|
int area_q[4];
|
|
int bit_size[4];
|
|
int prev_run[4];
|
|
int cur_ac;
|
|
int cno;
|
|
int dct_mode;
|
|
DCTELEM *mb;
|
|
uint8_t partial_bit_count;
|
|
uint32_t partial_bit_buffer; /* we can't use uint16_t here */
|
|
} EncBlockInfo;
|
|
|
|
static always_inline int dv_bits_left(PutBitContext* s)
|
|
{
|
|
return (s->buf_end - s->buf) * 8 -
|
|
((s->buf_ptr - s->buf) * 8 + 32 - (int64_t)s->bit_left);
|
|
}
|
|
|
|
static always_inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* pb_pool,
|
|
int pb_size)
|
|
{
|
|
int run;
|
|
int bits_left;
|
|
PutBitContext* pb = pb_pool;
|
|
int size = bi->partial_bit_count;
|
|
uint32_t vlc = bi->partial_bit_buffer;
|
|
|
|
bi->partial_bit_count = bi->partial_bit_buffer = 0;
|
|
vlc_loop:
|
|
/* Find suitable storage space */
|
|
for (; size > (bits_left = dv_bits_left(pb)); pb++) {
|
|
if (bits_left) {
|
|
size -= bits_left;
|
|
put_bits(pb, bits_left, vlc >> size);
|
|
vlc = vlc & ((1<<size)-1);
|
|
}
|
|
if (pb_size == 1) {
|
|
bi->partial_bit_count = size;
|
|
bi->partial_bit_buffer = vlc;
|
|
return;
|
|
}
|
|
--pb_size;
|
|
}
|
|
|
|
/* Store VLC */
|
|
put_bits(pb, size, vlc);
|
|
|
|
/* Construct the next VLC */
|
|
run = 0;
|
|
for (; bi->cur_ac < 64; bi->cur_ac++, run++) {
|
|
if (bi->mb[bi->cur_ac]) {
|
|
size = dv_rl2vlc(run, bi->mb[bi->cur_ac], &vlc);
|
|
bi->cur_ac++;
|
|
goto vlc_loop;
|
|
}
|
|
}
|
|
|
|
if (bi->cur_ac == 64) {
|
|
size = 4; vlc = 6; /* End Of Block stamp */
|
|
bi->cur_ac++;
|
|
goto vlc_loop;
|
|
}
|
|
}
|
|
|
|
static always_inline void dv_set_class_number(DCTELEM* blk, EncBlockInfo* bi,
|
|
const uint8_t* zigzag_scan, int bias)
|
|
{
|
|
int i, area;
|
|
int run;
|
|
int classes[] = {12, 24, 36, 0xffff};
|
|
|
|
run = 0;
|
|
bi->mb[0] = blk[0];
|
|
bi->cno = 0;
|
|
for (area = 0; area < 4; area++) {
|
|
bi->prev_run[area] = run;
|
|
bi->bit_size[area] = 0;
|
|
for (i=mb_area_start[area]; i<mb_area_start[area+1]; i++) {
|
|
bi->mb[i] = (blk[zigzag_scan[i]] / 16);
|
|
while ((bi->mb[i] ^ (bi->mb[i] >> 8)) > classes[bi->cno])
|
|
bi->cno++;
|
|
|
|
if (bi->mb[i]) {
|
|
bi->bit_size[area] += dv_rl2vlc_size(run, bi->mb[i]);
|
|
run = 0;
|
|
} else
|
|
++run;
|
|
}
|
|
}
|
|
bi->bit_size[3] += 4; /* EOB marker */
|
|
bi->cno += bias;
|
|
|
|
if (bi->cno >= 3) { /* FIXME: we have to recreate bit_size[], prev_run[] */
|
|
bi->cno = 3;
|
|
for (i=1; i<64; i++)
|
|
bi->mb[i] /= 2;
|
|
}
|
|
}
|
|
|
|
#define SC(x, y) ((s[x] - s[y]) ^ ((s[x] - s[y]) >> 7))
|
|
static always_inline int dv_guess_dct_mode(DCTELEM *blk) {
|
|
DCTELEM *s;
|
|
int score88 = 0;
|
|
int score248 = 0;
|
|
int i;
|
|
|
|
/* Compute 8-8 score (small values give a better chance for 8-8 DCT) */
|
|
s = blk;
|
|
for(i=0; i<7; i++) {
|
|
score88 += SC(0, 8) + SC(1, 9) + SC(2, 10) + SC(3, 11) +
|
|
SC(4, 12) + SC(5,13) + SC(6, 14) + SC(7, 15);
|
|
s += 8;
|
|
}
|
|
/* Compute 2-4-8 score (small values give a better chance for 2-4-8 DCT) */
|
|
s = blk;
|
|
for(i=0; i<6; i++) {
|
|
score248 += SC(0, 16) + SC(1,17) + SC(2, 18) + SC(3, 19) +
|
|
SC(4, 20) + SC(5,21) + SC(6, 22) + SC(7, 23);
|
|
s += 8;
|
|
}
|
|
|
|
return (score88 - score248 > -10);
|
|
}
|
|
|
|
static inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos)
|
|
{
|
|
int size[5];
|
|
int i, j, k, a, run;
|
|
EncBlockInfo* b;
|
|
|
|
do {
|
|
b = blks;
|
|
for (i=0; i<5; i++) {
|
|
if (!qnos[i])
|
|
continue;
|
|
|
|
qnos[i]--;
|
|
size[i] = 0;
|
|
for (j=0; j<6; j++, b++) {
|
|
for (a=0; a<4; a++) {
|
|
if (b->area_q[a] != dv_quant_shifts[qnos[i] + dv_quant_offset[b->cno]][a]) {
|
|
b->bit_size[a] = (a==3)?4:0;
|
|
b->area_q[a]++;
|
|
run = b->prev_run[a];
|
|
for (k=mb_area_start[a]; k<mb_area_start[a+1]; k++) {
|
|
b->mb[k] /= 2;
|
|
if (b->mb[k]) {
|
|
b->bit_size[a] += dv_rl2vlc_size(run, b->mb[k]);
|
|
run = 0;
|
|
} else
|
|
++run;
|
|
}
|
|
}
|
|
size[i] += b->bit_size[a];
|
|
}
|
|
}
|
|
}
|
|
} while ((vs_total_ac_bits < size[0] + size[1] + size[2] + size[3] + size[4]) &&
|
|
(qnos[0]|qnos[1]|qnos[2]|qnos[3]|qnos[4]));
|
|
}
|
|
|
|
/*
|
|
* This is a very rough initial implementaion. The performance is
|
|
* horrible and the weighting is missing. But it's missing from the
|
|
* decoding step also -- so at least we're on the same page with decoder ;-)
|
|
*/
|
|
static inline void dv_encode_video_segment(DVVideoDecodeContext *s,
|
|
uint8_t *dif,
|
|
const uint16_t *mb_pos_ptr)
|
|
{
|
|
int mb_index, i, j, v;
|
|
int mb_x, mb_y, c_offset, linesize;
|
|
uint8_t* y_ptr;
|
|
uint8_t* data;
|
|
uint8_t* ptr;
|
|
int do_edge_wrap;
|
|
DCTELEM block[64] __align8;
|
|
EncBlockInfo enc_blks[5*6];
|
|
PutBitContext pbs[5*6];
|
|
PutBitContext* pb;
|
|
EncBlockInfo* enc_blk;
|
|
int vs_bit_size = 0;
|
|
int qnos[5];
|
|
|
|
enc_blk = &enc_blks[0];
|
|
pb = &pbs[0];
|
|
for(mb_index = 0; mb_index < 5; mb_index++) {
|
|
v = *mb_pos_ptr++;
|
|
mb_x = v & 0xff;
|
|
mb_y = v >> 8;
|
|
y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);
|
|
c_offset = (s->sys->pix_fmt == PIX_FMT_YUV411P) ?
|
|
((mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8)) :
|
|
(((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8));
|
|
do_edge_wrap = 0;
|
|
qnos[mb_index] = 15; /* No quantization */
|
|
ptr = dif + mb_index*80 + 4;
|
|
for(j = 0;j < 6; j++) {
|
|
if (j < 4) { /* Four Y blocks */
|
|
/* NOTE: at end of line, the macroblock is handled as 420 */
|
|
if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
|
|
data = y_ptr + (j * 8);
|
|
} else {
|
|
data = y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]);
|
|
}
|
|
linesize = s->picture.linesize[0];
|
|
} else { /* Cr and Cb blocks */
|
|
/* don't ask Fabrice why they inverted Cb and Cr ! */
|
|
data = s->picture.data[6 - j] + c_offset;
|
|
linesize = s->picture.linesize[6 - j];
|
|
if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8))
|
|
do_edge_wrap = 1;
|
|
}
|
|
|
|
/* Everything is set up -- now just copy data -> DCT block */
|
|
if (do_edge_wrap) { /* Edge wrap copy: 4x16 -> 8x8 */
|
|
uint8_t* d;
|
|
DCTELEM *b = block;
|
|
for (i=0;i<8;i++) {
|
|
d = data + 8 * linesize;
|
|
b[0] = data[0]; b[1] = data[1]; b[2] = data[2]; b[3] = data[3];
|
|
b[4] = d[0]; b[5] = d[1]; b[6] = d[2]; b[7] = d[3];
|
|
data += linesize;
|
|
b += 8;
|
|
}
|
|
} else { /* Simple copy: 8x8 -> 8x8 */
|
|
s->get_pixels(block, data, linesize);
|
|
}
|
|
|
|
enc_blk->dct_mode = dv_guess_dct_mode(block);
|
|
enc_blk->mb = &s->block[mb_index*6+j][0];
|
|
enc_blk->area_q[0] = enc_blk->area_q[1] = enc_blk->area_q[2] = enc_blk->area_q[3] = 0;
|
|
enc_blk->partial_bit_count = 0;
|
|
enc_blk->partial_bit_buffer = 0;
|
|
enc_blk->cur_ac = 1;
|
|
|
|
s->fdct[enc_blk->dct_mode](block);
|
|
|
|
dv_set_class_number(block, enc_blk,
|
|
enc_blk->dct_mode ? ff_zigzag248_direct : ff_zigzag_direct,
|
|
j/4*(j%2));
|
|
|
|
init_put_bits(pb, ptr, block_sizes[j]/8);
|
|
put_bits(pb, 9, (uint16_t)(((enc_blk->mb[0] >> 3) - 1024) >> 2));
|
|
put_bits(pb, 1, enc_blk->dct_mode);
|
|
put_bits(pb, 2, enc_blk->cno);
|
|
|
|
vs_bit_size += enc_blk->bit_size[0] + enc_blk->bit_size[1] +
|
|
enc_blk->bit_size[2] + enc_blk->bit_size[3];
|
|
++enc_blk;
|
|
++pb;
|
|
ptr += block_sizes[j]/8;
|
|
}
|
|
}
|
|
|
|
if (vs_total_ac_bits < vs_bit_size)
|
|
dv_guess_qnos(&enc_blks[0], &qnos[0]);
|
|
|
|
for (i=0; i<5; i++) {
|
|
dif[i*80 + 3] = qnos[i];
|
|
}
|
|
|
|
/* First pass over individual cells only */
|
|
for (j=0; j<5*6; j++)
|
|
dv_encode_ac(&enc_blks[j], &pbs[j], 1);
|
|
|
|
/* Second pass over each MB space */
|
|
for (j=0; j<5*6; j++) {
|
|
if (enc_blks[j].cur_ac < 65 || enc_blks[j].partial_bit_count)
|
|
dv_encode_ac(&enc_blks[j], &pbs[(j/6)*6], 6);
|
|
}
|
|
|
|
/* Third and final pass over the whole vides segment space */
|
|
for (j=0; j<5*6; j++) {
|
|
if (enc_blks[j].cur_ac < 65 || enc_blks[j].partial_bit_count)
|
|
dv_encode_ac(&enc_blks[j], &pbs[0], 6*5);
|
|
}
|
|
|
|
for (j=0; j<5*6; j++)
|
|
flush_put_bits(&pbs[j]);
|
|
}
|
|
|
|
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
|
|
144000 bytes for PAL) */
|
|
static int dvvideo_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
DVVideoDecodeContext *s = avctx->priv_data;
|
|
int ds, vs;
|
|
const uint16_t *mb_pos_ptr;
|
|
|
|
s->sys = dv_frame_profile(buf);
|
|
if (!s->sys || buf_size < s->sys->frame_size)
|
|
return -1; /* NOTE: we only accept several full frames */
|
|
|
|
|
|
if(s->picture.data[0])
|
|
avctx->release_buffer(avctx, &s->picture);
|
|
|
|
s->picture.reference = 0;
|
|
avctx->pix_fmt = s->sys->pix_fmt;
|
|
avctx->width = s->sys->width;
|
|
avctx->height = s->sys->height;
|
|
if(avctx->get_buffer(avctx, &s->picture) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
s->picture.interlaced_frame = 1;
|
|
s->picture.top_field_first = 0;
|
|
|
|
/* for each DIF segment */
|
|
mb_pos_ptr = s->sys->video_place;
|
|
for (ds = 0; ds < s->sys->difseg_size; ds++) {
|
|
buf += 6 * 80; /* skip DIF segment header */
|
|
|
|
for(vs = 0; vs < 27; vs++) {
|
|
if ((vs % 3) == 0)
|
|
buf += 80; /* skip audio block */
|
|
|
|
#ifdef VLC_DEBUG
|
|
printf("********************* %d, %d **********************\n", ds, vs);
|
|
#endif
|
|
dv_decode_video_segment(s, buf, mb_pos_ptr);
|
|
buf += 5 * 80;
|
|
mb_pos_ptr += 5;
|
|
}
|
|
}
|
|
|
|
emms_c();
|
|
|
|
/* return image */
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data= s->picture;
|
|
|
|
return s->sys->frame_size;
|
|
}
|
|
|
|
static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size,
|
|
void *data)
|
|
{
|
|
DVVideoDecodeContext *s = c->priv_data;
|
|
const uint16_t *mb_pos_ptr;
|
|
int ds, vs;
|
|
|
|
s->sys = dv_codec_profile(c);
|
|
if (!s->sys)
|
|
return -1;
|
|
|
|
c->pix_fmt = s->sys->pix_fmt;
|
|
s->picture = *((AVFrame *)data);
|
|
|
|
/* for each DIF segment */
|
|
mb_pos_ptr = s->sys->video_place;
|
|
for (ds = 0; ds < s->sys->difseg_size; ds++) {
|
|
buf += 6 * 80; /* skip DIF segment header */
|
|
|
|
for(vs = 0; vs < 27; vs++) {
|
|
if ((vs % 3) == 0)
|
|
buf += 80; /* skip audio block */
|
|
|
|
#ifdef VLC_DEBUG
|
|
printf("********************* %d, %d **********************\n", ds, vs);
|
|
#endif
|
|
dv_encode_video_segment(s, buf, mb_pos_ptr);
|
|
buf += 5 * 80;
|
|
mb_pos_ptr += 5;
|
|
}
|
|
}
|
|
|
|
emms_c();
|
|
return s->sys->frame_size;
|
|
}
|
|
|
|
static int dvvideo_end(AVCodecContext *avctx)
|
|
{
|
|
avcodec_default_free_buffers(avctx);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec dvvideo_decoder = {
|
|
"dvvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_DVVIDEO,
|
|
sizeof(DVVideoDecodeContext),
|
|
dvvideo_init,
|
|
dvvideo_encode_frame,
|
|
dvvideo_end,
|
|
dvvideo_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
NULL
|
|
};
|