262 lines
8.2 KiB
C
262 lines
8.2 KiB
C
/*
|
|
* Sony PlayStation MDEC (Motion DECoder)
|
|
* Copyright (c) 2003 Michael Niedermayer
|
|
*
|
|
* based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Sony PlayStation MDEC (Motion DECoder)
|
|
* This is very similar to intra-only MPEG-1.
|
|
*/
|
|
|
|
#include "libavutil/mem_internal.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "blockdsp.h"
|
|
#include "bswapdsp.h"
|
|
#include "codec_internal.h"
|
|
#include "idctdsp.h"
|
|
#include "mpeg12data.h"
|
|
#include "mpeg12dec.h"
|
|
#include "thread.h"
|
|
|
|
typedef struct MDECContext {
|
|
AVCodecContext *avctx;
|
|
BlockDSPContext bdsp;
|
|
BswapDSPContext bbdsp;
|
|
IDCTDSPContext idsp;
|
|
GetBitContext gb;
|
|
uint8_t permutated_scantable[64];
|
|
int version;
|
|
int qscale;
|
|
int last_dc[3];
|
|
int mb_width;
|
|
int mb_height;
|
|
int mb_x, mb_y;
|
|
DECLARE_ALIGNED(32, int16_t, block)[6][64];
|
|
DECLARE_ALIGNED(16, uint16_t, quant_matrix)[64];
|
|
uint8_t *bitstream_buffer;
|
|
unsigned int bitstream_buffer_size;
|
|
int block_last_index[6];
|
|
} MDECContext;
|
|
|
|
//very similar to MPEG-1
|
|
static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
|
|
{
|
|
int level, diff, i, j, run;
|
|
int component;
|
|
const uint8_t *const scantable = a->permutated_scantable;
|
|
const uint16_t *quant_matrix = a->quant_matrix;
|
|
const int qscale = a->qscale;
|
|
|
|
/* DC coefficient */
|
|
if (a->version == 2) {
|
|
block[0] = 2 * get_sbits(&a->gb, 10) + 1024;
|
|
} else {
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
diff = decode_dc(&a->gb, component);
|
|
a->last_dc[component] += diff;
|
|
block[0] = a->last_dc[component] * (1 << 3);
|
|
}
|
|
|
|
i = 0;
|
|
{
|
|
OPEN_READER(re, &a->gb);
|
|
/* now quantify & encode AC coefficients */
|
|
for (;;) {
|
|
UPDATE_CACHE(re, &a->gb);
|
|
GET_RL_VLC(level, run, re, &a->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0);
|
|
|
|
if (level == 127) {
|
|
break;
|
|
} else if (level != 0) {
|
|
i += run;
|
|
if (i > 63) {
|
|
av_log(a->avctx, AV_LOG_ERROR,
|
|
"ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
j = scantable[i];
|
|
level = (level * qscale * quant_matrix[j]) >> 3;
|
|
level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
|
|
LAST_SKIP_BITS(re, &a->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
|
|
UPDATE_CACHE(re, &a->gb);
|
|
level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
|
|
i += run;
|
|
if (i > 63) {
|
|
av_log(a->avctx, AV_LOG_ERROR,
|
|
"ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
j = scantable[i];
|
|
if (level < 0) {
|
|
level = -level;
|
|
level = (level * (unsigned)qscale * quant_matrix[j]) >> 3;
|
|
level = (level - 1) | 1;
|
|
level = -level;
|
|
} else {
|
|
level = (level * (unsigned)qscale * quant_matrix[j]) >> 3;
|
|
level = (level - 1) | 1;
|
|
}
|
|
}
|
|
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &a->gb);
|
|
}
|
|
a->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static inline int decode_mb(MDECContext *a, int16_t block[6][64])
|
|
{
|
|
int i, ret;
|
|
static const int block_index[6] = { 5, 4, 0, 1, 2, 3 };
|
|
|
|
a->bdsp.clear_blocks(block[0]);
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
if ((ret = mdec_decode_block_intra(a, block[block_index[i]],
|
|
block_index[i])) < 0)
|
|
return ret;
|
|
if (get_bits_left(&a->gb) < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y)
|
|
{
|
|
int16_t (*block)[64] = a->block;
|
|
int linesize = frame->linesize[0];
|
|
|
|
uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
|
|
uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
|
|
uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
|
|
|
|
a->idsp.idct_put(dest_y, linesize, block[0]);
|
|
a->idsp.idct_put(dest_y + 8, linesize, block[1]);
|
|
a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
|
|
a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
|
|
|
|
if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
|
|
a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
|
|
a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
|
|
}
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
MDECContext * const a = avctx->priv_data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int ret;
|
|
|
|
if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
frame->key_frame = 1;
|
|
|
|
av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size);
|
|
if (!a->bitstream_buffer)
|
|
return AVERROR(ENOMEM);
|
|
a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2);
|
|
if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0)
|
|
return ret;
|
|
|
|
/* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
|
|
skip_bits(&a->gb, 32);
|
|
|
|
a->qscale = get_bits(&a->gb, 16);
|
|
a->version = get_bits(&a->gb, 16);
|
|
|
|
a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128;
|
|
|
|
for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) {
|
|
for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) {
|
|
if ((ret = decode_mb(a, a->block)) < 0)
|
|
return ret;
|
|
|
|
idct_put(a, frame, a->mb_x, a->mb_y);
|
|
}
|
|
}
|
|
|
|
*got_frame = 1;
|
|
|
|
return (get_bits_count(&a->gb) + 31) / 32 * 4;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
MDECContext * const a = avctx->priv_data;
|
|
int i;
|
|
|
|
a->mb_width = (avctx->coded_width + 15) / 16;
|
|
a->mb_height = (avctx->coded_height + 15) / 16;
|
|
|
|
a->avctx = avctx;
|
|
|
|
ff_blockdsp_init(&a->bdsp);
|
|
ff_bswapdsp_init(&a->bbdsp);
|
|
ff_idctdsp_init(&a->idsp, avctx);
|
|
ff_mpeg12_init_vlcs();
|
|
ff_permute_scantable(a->permutated_scantable, ff_zigzag_direct,
|
|
a->idsp.idct_permutation);
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_YUVJ420P;
|
|
avctx->color_range = AVCOL_RANGE_JPEG;
|
|
|
|
/* init q matrix */
|
|
for (i = 0; i < 64; i++) {
|
|
int j = a->idsp.idct_permutation[i];
|
|
|
|
a->quant_matrix[j] = ff_mpeg1_default_intra_matrix[i];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
MDECContext * const a = avctx->priv_data;
|
|
|
|
av_freep(&a->bitstream_buffer);
|
|
a->bitstream_buffer_size = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_mdec_decoder = {
|
|
.p.name = "mdec",
|
|
CODEC_LONG_NAME("Sony PlayStation MDEC (Motion DECoder)"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_MDEC,
|
|
.priv_data_size = sizeof(MDECContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
FF_CODEC_DECODE_CB(decode_frame),
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
|
|
};
|