674 lines
20 KiB
C
674 lines
20 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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* 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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#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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#define NTSC_FRAME_SIZE 120000
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#define PAL_FRAME_SIZE 144000
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#define TEX_VLC_BITS 9
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typedef struct DVVideoDecodeContext {
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AVCodecContext *avctx;
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GetBitContext gb;
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VLC *vlc;
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int sampling_411; /* 0 = 420, 1 = 411 */
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int width, height;
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UINT8 *current_picture[3]; /* picture structure */
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AVFrame picture;
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int linesize[3];
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DCTELEM block[5*6][64] __align8;
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UINT8 dv_zigzag[2][64];
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UINT8 idct_permutation[64];
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/* XXX: move it to static storage ? */
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UINT8 dv_shift[2][22][64];
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void (*idct_put[2])(UINT8 *dest, int line_size, DCTELEM *block);
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} DVVideoDecodeContext;
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#include "dvdata.h"
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static VLC dv_vlc;
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/* XXX: also include quantization */
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static RL_VLC_ELEM *dv_rl_vlc[1];
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static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
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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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/* 88 unquant */
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for(i = 1; i < 64; i++) {
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/* 88 table */
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j = s->idct_permutation[i];
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s->dv_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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/* 248 unquant */
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for(i = 1; i < 64; i++) {
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/* 248 table */
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s->dv_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_decode_init(AVCodecContext *avctx)
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{
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DVVideoDecodeContext *s = avctx->priv_data;
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MpegEncContext s2;
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static int done;
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if (!done) {
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int i;
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done = 1;
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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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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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}
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/* ugly way to get the idct & scantable */
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/* XXX: fix it */
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memset(&s2, 0, sizeof(MpegEncContext));
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s2.avctx = avctx;
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dsputil_init(&s2.dsp, avctx->dsp_mask);
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if (DCT_common_init(&s2) < 0)
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return -1;
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s->idct_put[0] = s2.idct_put;
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memcpy(s->idct_permutation, s2.idct_permutation, 64);
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memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64);
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/* XXX: use MMX also for idct248 */
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s->idct_put[1] = simple_idct248_put;
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memcpy(s->dv_zigzag[1], dv_248_zigzag, 64);
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/* XXX: do it only for constant case */
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dv_build_unquantize_tables(s);
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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 *shift_table;
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const UINT8 *scan_table;
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UINT8 pos; /* position in block */
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UINT8 eob_reached; /* true if EOB has been reached */
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UINT8 dct_mode;
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UINT8 partial_bit_count;
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UINT16 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 block_sizes[6] = {
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112, 112, 112, 112, 80, 80
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};
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#ifndef ALT_BITSTREAM_READER
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#error 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, INT16 *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 *scan_table = mb->scan_table;
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const UINT8 *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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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 buf[4];
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UINT32 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);
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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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printf("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 *buf_ptr1,
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const UINT16 *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 *y_ptr;
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BlockInfo mb_data[5 * 6], *mb, *mb1;
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void (*idct_put)(UINT8 *dest, int line_size, DCTELEM *block);
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UINT8 *buf_ptr;
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PutBitContext pb, vs_pb;
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UINT8 mb_bit_buffer[80 + 4]; /* allow some slack */
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int mb_bit_count;
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UINT8 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, NULL, NULL);
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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, NULL, NULL);
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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);
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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_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];
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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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dv_decode_ac(s, mb, block, last_index);
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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 - s->gb.index;
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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;
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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 */
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#ifdef VLC_DEBUG
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printf("***pass 2 size=%d\n", mb_bit_count);
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#endif
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block = block1;
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mb = mb1;
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init_get_bits(&s->gb, mb_bit_buffer, 80);
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for(j = 0;j < 6; j++) {
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if (!mb->eob_reached && s->gb.index < mb_bit_count) {
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dv_decode_ac(s, mb, block, mb_bit_count);
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/* if still not finished, no need to parse other blocks */
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if (!mb->eob_reached) {
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/* we could not parse the current AC coefficient,
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so we add the remaining bytes */
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bits_left = mb_bit_count - s->gb.index;
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if (bits_left > 0) {
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mb->partial_bit_count += bits_left;
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mb->partial_bit_buffer =
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(mb->partial_bit_buffer << bits_left) |
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get_bits(&s->gb, bits_left);
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}
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goto next_mb;
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}
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}
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block += 64;
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mb++;
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}
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/* all blocks are finished, so the extra bytes can be used at
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the video segment level */
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bits_left = mb_bit_count - s->gb.index;
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vs_bit_count += bits_left;
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bit_copy(&vs_pb, &s->gb, bits_left);
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next_mb:
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mb1 += 6;
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block1 += 6 * 64;
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}
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/* we need a pass other the whole video segment */
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flush_put_bits(&vs_pb);
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#ifdef VLC_DEBUG
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printf("***pass 3 size=%d\n", vs_bit_count);
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#endif
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block = &s->block[0][0];
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mb = mb_data;
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init_get_bits(&s->gb, vs_bit_buffer, 5 * 80);
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for(mb_index = 0; mb_index < 5; mb_index++) {
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for(j = 0;j < 6; j++) {
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if (!mb->eob_reached) {
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#ifdef VLC_DEBUG
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printf("start %d:%d\n", mb_index, j);
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#endif
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dv_decode_ac(s, mb, block, vs_bit_count);
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}
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block += 64;
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mb++;
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}
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}
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/* compute idct and place blocks */
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block = &s->block[0][0];
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mb = mb_data;
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for(mb_index = 0; mb_index < 5; mb_index++) {
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v = *mb_pos_ptr++;
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mb_x = v & 0xff;
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mb_y = v >> 8;
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y_ptr = s->current_picture[0] + (mb_y * s->linesize[0] * 8) + (mb_x * 8);
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if (s->sampling_411)
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c_offset = (mb_y * s->linesize[1] * 8) + ((mb_x >> 2) * 8);
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else
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c_offset = ((mb_y >> 1) * s->linesize[1] * 8) + ((mb_x >> 1) * 8);
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for(j = 0;j < 6; j++) {
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idct_put = s->idct_put[mb->dct_mode];
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if (j < 4) {
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if (s->sampling_411 && mb_x < (704 / 8)) {
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/* NOTE: at end of line, the macroblock is handled as 420 */
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idct_put(y_ptr + (j * 8), s->linesize[0], block);
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} else {
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idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->linesize[0]),
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s->linesize[0], block);
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}
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} else {
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if (s->sampling_411 && mb_x >= (704 / 8)) {
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uint8_t pixels[64], *c_ptr, *c_ptr1, *ptr;
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int y, linesize;
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/* NOTE: at end of line, the macroblock is handled as 420 */
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idct_put(pixels, 8, block);
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linesize = s->linesize[6 - j];
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c_ptr = s->current_picture[6 - j] + c_offset;
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ptr = pixels;
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for(y = 0;y < 8; y++) {
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/* convert to 411P */
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c_ptr1 = c_ptr + linesize;
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c_ptr1[0] = c_ptr[0] = (ptr[0] + ptr[1]) >> 1;
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c_ptr1[1] = c_ptr[1] = (ptr[2] + ptr[3]) >> 1;
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c_ptr1[2] = c_ptr[2] = (ptr[4] + ptr[5]) >> 1;
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c_ptr1[3] = c_ptr[3] = (ptr[6] + ptr[7]) >> 1;
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c_ptr += linesize * 2;
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ptr += 8;
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}
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} else {
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/* don't ask me why they inverted Cb and Cr ! */
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idct_put(s->current_picture[6 - j] + c_offset,
|
|
s->linesize[6 - j], block);
|
|
}
|
|
}
|
|
block += 64;
|
|
mb++;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* 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 *buf, int buf_size)
|
|
{
|
|
DVVideoDecodeContext *s = avctx->priv_data;
|
|
int sct, dsf, apt, ds, nb_dif_segs, vs, width, height, i, packet_size;
|
|
UINT8 *buf_ptr;
|
|
const UINT16 *mb_pos_ptr;
|
|
|
|
/* parse id */
|
|
init_get_bits(&s->gb, buf, buf_size);
|
|
sct = get_bits(&s->gb, 3);
|
|
if (sct != 0)
|
|
return -1;
|
|
skip_bits(&s->gb, 5);
|
|
get_bits(&s->gb, 4); /* dsn (sequence number */
|
|
get_bits(&s->gb, 1); /* fsc (channel number) */
|
|
skip_bits(&s->gb, 3);
|
|
get_bits(&s->gb, 8); /* dbn (diff block number 0-134) */
|
|
|
|
dsf = get_bits(&s->gb, 1); /* 0 = NTSC 1 = PAL */
|
|
if (get_bits(&s->gb, 1) != 0)
|
|
return -1;
|
|
skip_bits(&s->gb, 11);
|
|
apt = get_bits(&s->gb, 3); /* apt */
|
|
|
|
get_bits(&s->gb, 1); /* tf1 */
|
|
skip_bits(&s->gb, 4);
|
|
get_bits(&s->gb, 3); /* ap1 */
|
|
|
|
get_bits(&s->gb, 1); /* tf2 */
|
|
skip_bits(&s->gb, 4);
|
|
get_bits(&s->gb, 3); /* ap2 */
|
|
|
|
get_bits(&s->gb, 1); /* tf3 */
|
|
skip_bits(&s->gb, 4);
|
|
get_bits(&s->gb, 3); /* ap3 */
|
|
|
|
/* init size */
|
|
width = 720;
|
|
if (dsf) {
|
|
avctx->frame_rate = 25 * FRAME_RATE_BASE;
|
|
packet_size = PAL_FRAME_SIZE;
|
|
height = 576;
|
|
nb_dif_segs = 12;
|
|
} else {
|
|
avctx->frame_rate = 30 * FRAME_RATE_BASE;
|
|
packet_size = NTSC_FRAME_SIZE;
|
|
height = 480;
|
|
nb_dif_segs = 10;
|
|
}
|
|
/* NOTE: we only accept several full frames */
|
|
if (buf_size < packet_size)
|
|
return -1;
|
|
|
|
/* XXX: is it correct to assume that 420 is always used in PAL
|
|
mode ? */
|
|
s->sampling_411 = !dsf;
|
|
if (s->sampling_411) {
|
|
mb_pos_ptr = dv_place_411;
|
|
avctx->pix_fmt = PIX_FMT_YUV411P;
|
|
} else {
|
|
mb_pos_ptr = dv_place_420;
|
|
avctx->pix_fmt = PIX_FMT_YUV420P;
|
|
}
|
|
|
|
avctx->width = width;
|
|
avctx->height = height;
|
|
|
|
s->picture.reference= 0;
|
|
if(avctx->get_buffer(avctx, &s->picture) < 0) {
|
|
fprintf(stderr, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
for(i=0;i<3;i++) {
|
|
s->current_picture[i] = s->picture.data[i];
|
|
s->linesize[i] = s->picture.linesize[i];
|
|
if (!s->current_picture[i])
|
|
return -1;
|
|
}
|
|
s->width = width;
|
|
s->height = height;
|
|
|
|
/* for each DIF segment */
|
|
buf_ptr = buf;
|
|
for (ds = 0; ds < nb_dif_segs; ds++) {
|
|
buf_ptr += 6 * 80; /* skip DIF segment header */
|
|
|
|
for(vs = 0; vs < 27; vs++) {
|
|
if ((vs % 3) == 0) {
|
|
/* skip audio block */
|
|
buf_ptr += 80;
|
|
}
|
|
dv_decode_video_segment(s, buf_ptr, mb_pos_ptr);
|
|
buf_ptr += 5 * 80;
|
|
mb_pos_ptr += 5;
|
|
}
|
|
}
|
|
|
|
emms_c();
|
|
|
|
/* return image */
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data= s->picture;
|
|
|
|
avctx->release_buffer(avctx, &s->picture);
|
|
|
|
return packet_size;
|
|
}
|
|
|
|
static int dvvideo_decode_end(AVCodecContext *avctx)
|
|
{
|
|
DVVideoDecodeContext *s = avctx->priv_data;
|
|
int i;
|
|
|
|
if(avctx->get_buffer == avcodec_default_get_buffer){
|
|
for(i=0; i<4; i++){
|
|
av_freep(&s->picture.base[i]);
|
|
s->picture.data[i]= NULL;
|
|
}
|
|
av_freep(&s->picture.opaque);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec dvvideo_decoder = {
|
|
"dvvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_DVVIDEO,
|
|
sizeof(DVVideoDecodeContext),
|
|
dvvideo_decode_init,
|
|
NULL,
|
|
dvvideo_decode_end,
|
|
dvvideo_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
NULL
|
|
};
|
|
|
|
typedef struct DVAudioDecodeContext {
|
|
AVCodecContext *avctx;
|
|
GetBitContext gb;
|
|
|
|
} DVAudioDecodeContext;
|
|
|
|
static int dvaudio_decode_init(AVCodecContext *avctx)
|
|
{
|
|
// DVAudioDecodeContext *s = avctx->priv_data;
|
|
return 0;
|
|
}
|
|
|
|
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
|
|
144000 bytes for PAL) */
|
|
static int dvaudio_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
UINT8 *buf, int buf_size)
|
|
{
|
|
// DVAudioDecodeContext *s = avctx->priv_data;
|
|
return buf_size;
|
|
}
|
|
|
|
static int dvaudio_decode_end(AVCodecContext *avctx)
|
|
{
|
|
// DVAudioDecodeContext *s = avctx->priv_data;
|
|
return 0;
|
|
}
|
|
|
|
AVCodec dvaudio_decoder = {
|
|
"dvaudio",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_DVAUDIO,
|
|
sizeof(DVAudioDecodeContext),
|
|
dvaudio_decode_init,
|
|
NULL,
|
|
dvaudio_decode_end,
|
|
dvaudio_decode_frame,
|
|
0,
|
|
NULL
|
|
};
|