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FFmpeg/libavcodec/dv.c

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/*
* DV decoder
* Copyright (c) 2002 Fabrice Bellard.
*
* DV encoder
* Copyright (c) 2003 Roman Shaposhnik.
*
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
* of DV technical info.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file dv.c
* DV codec.
*/
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "simple_idct.h"
#include "dvdata.h"
typedef struct DVVideoDecodeContext {
const DVprofile* sys;
AVFrame picture;
uint8_t dv_zigzag[2][64];
uint8_t dv_idct_shift[2][22][64];
void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
void (*fdct[2])(DCTELEM *block);
void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
GetBitContext gb;
DCTELEM block[5*6][64] __align8;
} DVVideoDecodeContext;
#define TEX_VLC_BITS 9
#ifdef DV_CODEC_TINY_TARGET
#define DV_VLC_MAP_RUN_SIZE 15
#define DV_VLC_MAP_LEV_SIZE 23
#else
#define DV_VLC_MAP_RUN_SIZE 64
#define DV_VLC_MAP_LEV_SIZE 512
#endif
/* XXX: also include quantization */
static RL_VLC_ELEM *dv_rl_vlc[1];
/* VLC encoding lookup table */
static struct dv_vlc_pair {
uint32_t vlc;
uint8_t size;
} (*dv_vlc_map)[DV_VLC_MAP_LEV_SIZE] = NULL;
static void dv_build_unquantize_tables(DVVideoDecodeContext *s, uint8_t* perm)
{
int i, q, j;
/* NOTE: max left shift is 6 */
for(q = 0; q < 22; q++) {
/* 88DCT */
for(i = 1; i < 64; i++) {
/* 88 table */
j = perm[i];
s->dv_idct_shift[0][q][j] =
dv_quant_shifts[q][dv_88_areas[i]] + 1;
}
/* 248DCT */
for(i = 1; i < 64; i++) {
/* 248 table */
s->dv_idct_shift[1][q][i] =
dv_quant_shifts[q][dv_248_areas[i]] + 1;
}
}
}
static int dvvideo_init(AVCodecContext *avctx)
{
DVVideoDecodeContext *s = avctx->priv_data;
DSPContext dsp;
static int done=0;
int i, j;
if (!done) {
int i;
VLC dv_vlc;
done = 1;
dv_vlc_map = av_mallocz(DV_VLC_MAP_LEV_SIZE*DV_VLC_MAP_RUN_SIZE*sizeof(struct dv_vlc_pair));
if (!dv_vlc_map)
return -ENOMEM;
/* 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, NB_DV_VLC,
dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2);
dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));
if (!dv_rl_vlc[0]) {
av_free(dv_vlc_map);
return -ENOMEM;
}
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 if (code == (NB_DV_VLC - 1)) {
/* EOB */
run = 0;
level = 256;
} else {
run= dv_vlc_run[code] + 1;
level= dv_vlc_level[code];
}
dv_rl_vlc[0][i].len = len;
dv_rl_vlc[0][i].level = level;
dv_rl_vlc[0][i].run = run;
}
for (i = 0; i < NB_DV_VLC - 1; i++) {
if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE || dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
continue;
if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
continue;
dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc = dv_vlc_bits[i] <<
(!!dv_vlc_level[i]);
dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size = dv_vlc_len[i] +
(!!dv_vlc_level[i]);
}
for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
#ifdef DV_CODEC_TINY_TARGET
for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
if (dv_vlc_map[i][j].size == 0) {
dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
(dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
dv_vlc_map[0][j].size;
}
}
#else
for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
if (dv_vlc_map[i][j].size == 0) {
dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
(dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
dv_vlc_map[0][j].size;
}
dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
dv_vlc_map[i][j].vlc | 1;
dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
dv_vlc_map[i][j].size;
}
#endif
}
}
/* Generic DSP setup */
dsputil_init(&dsp, avctx);
s->get_pixels = dsp.get_pixels;
/* 88DCT setup */
s->fdct[0] = dsp.fdct;
s->idct_put[0] = dsp.idct_put;
for (i=0; i<64; i++)
s->dv_zigzag[0][i] = dsp.idct_permutation[ff_zigzag_direct[i]];
/* 248DCT setup */
s->fdct[1] = dsp.fdct248;
s->idct_put[1] = simple_idct248_put; // FIXME: need to add it to DSP
memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
/* XXX: do it only for constant case */
dv_build_unquantize_tables(s, dsp.idct_permutation);
/* FIXME: I really don't think this should be here */
if (dv_codec_profile(avctx))
avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt;
avctx->coded_frame = &s->picture;
return 0;
}
// #define VLC_DEBUG
typedef struct BlockInfo {
const uint8_t *shift_table;
const uint8_t *scan_table;
uint8_t pos; /* position in block */
uint8_t eob_reached; /* true if EOB has been reached */
uint8_t dct_mode;
uint8_t partial_bit_count;
uint16_t partial_bit_buffer;
int shift_offset;
} BlockInfo;
/* block size in bits */
static const uint16_t block_sizes[6] = {
112, 112, 112, 112, 80, 80
};
/* bit budget for AC only in 5 MBs */
static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5;
/* see dv_88_areas and dv_248_areas for details */
static const int mb_area_start[5] = { 1, 6, 21, 43, 64 };
#ifndef ALT_BITSTREAM_READER
#warning only works with ALT_BITSTREAM_READER
#endif
/* decode ac coefs */
static void dv_decode_ac(DVVideoDecodeContext *s,
BlockInfo *mb, DCTELEM *block, int last_index)
{
int last_re_index;
int shift_offset = mb->shift_offset;
const uint8_t *scan_table = mb->scan_table;
const uint8_t *shift_table = mb->shift_table;
int pos = mb->pos;
int level, pos1, sign, run;
int partial_bit_count;
#ifndef ALT_BITSTREAM_READER //FIXME
int re_index=0;
int re1_index=0;
#endif
OPEN_READER(re, &s->gb);
#ifdef VLC_DEBUG
printf("start\n");
#endif
/* if we must parse a partial vlc, we do it here */
partial_bit_count = mb->partial_bit_count;
if (partial_bit_count > 0) {
uint8_t buf[4];
uint32_t v;
int l, l1;
GetBitContext gb1;
/* build the dummy bit buffer */
l = 16 - partial_bit_count;
UPDATE_CACHE(re, &s->gb);
#ifdef VLC_DEBUG
printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));
#endif
v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);
buf[0] = v >> 8;
buf[1] = v;
#ifdef VLC_DEBUG
printf("v=%04x cnt=%d %04x\n",
v, partial_bit_count, (mb->partial_bit_buffer << l));
#endif
/* try to read the codeword */
init_get_bits(&gb1, buf, 4*8);
{
OPEN_READER(re1, &gb1);
UPDATE_CACHE(re1, &gb1);
GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0],
TEX_VLC_BITS, 2);
l = re1_index;
CLOSE_READER(re1, &gb1);
}
#ifdef VLC_DEBUG
printf("****run=%d level=%d size=%d\n", run, level, l);
#endif
/* compute codeword length */
l1 = (level != 256 && level != 0);
/* if too long, we cannot parse */
l -= partial_bit_count;
if ((re_index + l + l1) > last_index)
return;
/* skip read bits */
last_re_index = 0; /* avoid warning */
re_index += l;
/* by definition, if we can read the vlc, all partial bits
will be read (otherwise we could have read the vlc before) */
mb->partial_bit_count = 0;
UPDATE_CACHE(re, &s->gb);
goto handle_vlc;
}
/* get the AC coefficients until last_index is reached */
for(;;) {
UPDATE_CACHE(re, &s->gb);
#ifdef VLC_DEBUG
printf("%2d: bits=%04x index=%d\n",
pos, SHOW_UBITS(re, &s->gb, 16), re_index);
#endif
last_re_index = re_index;
GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0],
TEX_VLC_BITS, 2);
handle_vlc:
#ifdef VLC_DEBUG
printf("run=%d level=%d\n", run, level);
#endif
if (level == 256) {
if (re_index > last_index) {
cannot_read:
/* put position before read code */
re_index = last_re_index;
mb->eob_reached = 0;
break;
}
/* EOB */
mb->eob_reached = 1;
break;
} else if (level != 0) {
if ((re_index + 1) > last_index)
goto cannot_read;
sign = SHOW_SBITS(re, &s->gb, 1);
level = (level ^ sign) - sign;
LAST_SKIP_BITS(re, &s->gb, 1);
pos += run;
/* error */
if (pos >= 64) {
goto read_error;
}
pos1 = scan_table[pos];
level = level << (shift_table[pos1] + shift_offset);
block[pos1] = level;
// printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);
} else {
if (re_index > last_index)
goto cannot_read;
/* level is zero: means run without coding. No
sign is coded */
pos += run;
/* error */
if (pos >= 64) {
read_error:
#if defined(VLC_DEBUG) || 1
av_log(NULL, AV_LOG_ERROR, "error pos=%d\n", pos);
#endif
/* for errors, we consider the eob is reached */
mb->eob_reached = 1;
break;
}
}
}
CLOSE_READER(re, &s->gb);
mb->pos = pos;
}
static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)
{
while (bits_left >= 16) {
put_bits(pb, 16, get_bits(gb, 16));
bits_left -= 16;
}
if (bits_left > 0) {
put_bits(pb, bits_left, get_bits(gb, bits_left));
}
}
/* mb_x and mb_y are in units of 8 pixels */
static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
uint8_t *buf_ptr1,
const uint16_t *mb_pos_ptr)
{
int quant, dc, dct_mode, class1, j;
int mb_index, mb_x, mb_y, v, last_index;
DCTELEM *block, *block1;
int c_offset, bits_left;
uint8_t *y_ptr;
BlockInfo mb_data[5 * 6], *mb, *mb1;
void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
uint8_t *buf_ptr;
PutBitContext pb, vs_pb;
uint8_t mb_bit_buffer[80 + 4]; /* allow some slack */
int mb_bit_count;
uint8_t vs_bit_buffer[5 * 80 + 4]; /* allow some slack */
int vs_bit_count;
memset(s->block, 0, sizeof(s->block));
/* pass 1 : read DC and AC coefficients in blocks */
buf_ptr = buf_ptr1;
block1 = &s->block[0][0];
mb1 = mb_data;
init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
vs_bit_count = 0;
for(mb_index = 0; mb_index < 5; mb_index++) {
/* skip header */
quant = buf_ptr[3] & 0x0f;
buf_ptr += 4;
init_put_bits(&pb, mb_bit_buffer, 80);
mb_bit_count = 0;
mb = mb1;
block = block1;
for(j = 0;j < 6; j++) {
/* NOTE: size is not important here */
init_get_bits(&s->gb, buf_ptr, 14*8);
/* get the dc */
dc = get_bits(&s->gb, 9);
dc = (dc << (32 - 9)) >> (32 - 9);
dct_mode = get_bits1(&s->gb);
mb->dct_mode = dct_mode;
mb->scan_table = s->dv_zigzag[dct_mode];
class1 = get_bits(&s->gb, 2);
mb->shift_offset = (class1 == 3);
mb->shift_table = s->dv_idct_shift[dct_mode]
[quant + dv_quant_offset[class1]];
dc = dc << 2;
/* convert to unsigned because 128 is not added in the
standard IDCT */
dc += 1024;
block[0] = dc;
last_index = block_sizes[j];
buf_ptr += last_index >> 3;
mb->pos = 0;
mb->partial_bit_count = 0;
#ifdef VLC_DEBUG
printf("MB block: %d, %d ", mb_index, j);
#endif
dv_decode_ac(s, mb, block, last_index);
/* write the remaining bits in a new buffer only if the
block is finished */
bits_left = last_index - get_bits_count(&s->gb);
if (mb->eob_reached) {
mb->partial_bit_count = 0;
mb_bit_count += bits_left;
bit_copy(&pb, &s->gb, bits_left);
} else {
/* should be < 16 bits otherwise a codeword could have
been parsed */
mb->partial_bit_count = bits_left;
mb->partial_bit_buffer = get_bits(&s->gb, bits_left);
}
block += 64;
mb++;
}
flush_put_bits(&pb);
/* pass 2 : we can do it just after */
#ifdef VLC_DEBUG
printf("***pass 2 size=%d MB#=%d\n", mb_bit_count, mb_index);
#endif
block = block1;
mb = mb1;
init_get_bits(&s->gb, mb_bit_buffer, 80*8);
for(j = 0;j < 6; j++) {
if (!mb->eob_reached && get_bits_count(&s->gb) < mb_bit_count) {
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
};