mirror of https://git.ffmpeg.org/ffmpeg.git
572 lines
18 KiB
C
572 lines
18 KiB
C
/*
|
|
* DV decoder
|
|
* Copyright (c) 2002 Fabrice Bellard.
|
|
*
|
|
* 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 decoder.
|
|
*/
|
|
#include "avcodec.h"
|
|
#include "dsputil.h"
|
|
#include "mpegvideo.h"
|
|
#include "simple_idct.h"
|
|
#include "dvdata.h"
|
|
|
|
typedef struct DVVideoDecodeContext {
|
|
const DVprofile* sys;
|
|
GetBitContext gb;
|
|
AVFrame picture;
|
|
DCTELEM block[5*6][64] __align8;
|
|
|
|
/* FIXME: the following is extracted from DSP */
|
|
uint8_t dv_zigzag[2][64];
|
|
uint8_t idct_permutation[64];
|
|
void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
|
|
void (*fdct)(DCTELEM *block);
|
|
|
|
/* XXX: move it to static storage ? */
|
|
uint8_t dv_shift[2][22][64];
|
|
void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
|
|
} DVVideoDecodeContext;
|
|
|
|
#define TEX_VLC_BITS 9
|
|
/* XXX: also include quantization */
|
|
static RL_VLC_ELEM *dv_rl_vlc[1];
|
|
static VLC_TYPE dv_vlc_codes[15][23];
|
|
|
|
static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
|
|
{
|
|
int i, q, j;
|
|
|
|
/* NOTE: max left shift is 6 */
|
|
for(q = 0; q < 22; q++) {
|
|
/* 88 unquant */
|
|
for(i = 1; i < 64; i++) {
|
|
/* 88 table */
|
|
j = s->idct_permutation[i];
|
|
s->dv_shift[0][q][j] =
|
|
dv_quant_shifts[q][dv_88_areas[i]] + 1;
|
|
}
|
|
|
|
/* 248 unquant */
|
|
for(i = 1; i < 64; i++) {
|
|
/* 248 table */
|
|
s->dv_shift[1][q][i] =
|
|
dv_quant_shifts[q][dv_248_areas[i]] + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int dvvideo_decode_init(AVCodecContext *avctx)
|
|
{
|
|
DVVideoDecodeContext *s = avctx->priv_data;
|
|
MpegEncContext s2;
|
|
static int done=0;
|
|
|
|
if (!done) {
|
|
int i;
|
|
VLC dv_vlc;
|
|
|
|
done = 1;
|
|
|
|
/* 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));
|
|
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;
|
|
}
|
|
|
|
memset(dv_vlc_codes, 0xff, sizeof(dv_vlc_codes));
|
|
for (i = 0; i < NB_DV_VLC - 1; i++) {
|
|
if (dv_vlc_run[i] < 15 && dv_vlc_level[i] < 23 && dv_vlc_len[i] < 15)
|
|
dv_vlc_codes[dv_vlc_run[i]][dv_vlc_level[i]] = i;
|
|
}
|
|
}
|
|
|
|
/* ugly way to get the idct & scantable */
|
|
/* XXX: fix it */
|
|
memset(&s2, 0, sizeof(MpegEncContext));
|
|
s2.avctx = avctx;
|
|
dsputil_init(&s2.dsp, avctx);
|
|
if (DCT_common_init(&s2) < 0)
|
|
return -1;
|
|
|
|
s->get_pixels = s2.dsp.get_pixels;
|
|
s->fdct = s2.dsp.fdct;
|
|
|
|
s->idct_put[0] = s2.dsp.idct_put;
|
|
memcpy(s->idct_permutation, s2.dsp.idct_permutation, 64);
|
|
memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64);
|
|
|
|
/* XXX: use MMX also for idct248 */
|
|
s->idct_put[1] = simple_idct248_put;
|
|
memcpy(s->dv_zigzag[1], dv_248_zigzag, 64);
|
|
|
|
/* XXX: do it only for constant case */
|
|
dv_build_unquantize_tables(s);
|
|
|
|
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
|
|
};
|
|
|
|
#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
|
|
fprintf(stderr, "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, NULL, NULL);
|
|
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, NULL, NULL);
|
|
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_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;
|
|
|
|
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\n", mb_bit_count);
|
|
#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)) {
|
|
uint8_t pixels[64], *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++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
if(avctx->get_buffer(avctx, &s->picture) < 0) {
|
|
fprintf(stderr, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
/* 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 */
|
|
|
|
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_decode_end(AVCodecContext *avctx)
|
|
{
|
|
avcodec_default_free_buffers(avctx);
|
|
|
|
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
|
|
};
|