0,0 → 1,255 |
/* |
* 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 "avcodec.h" |
#include "mpegvideo.h" |
#include "mpeg12.h" |
#include "thread.h" |
|
typedef struct MDECContext { |
AVCodecContext *avctx; |
DSPContext dsp; |
ThreadFrame frame; |
GetBitContext gb; |
ScanTable scantable; |
int version; |
int qscale; |
int last_dc[3]; |
int mb_width; |
int mb_height; |
int mb_x, mb_y; |
DECLARE_ALIGNED(16, int16_t, block)[6][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; |
RLTable *rl = &ff_rl_mpeg1; |
uint8_t * const scantable = a->scantable.permutated; |
const uint16_t *quant_matrix = ff_mpeg1_default_intra_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); |
if (diff >= 0xffff) |
return AVERROR_INVALIDDATA; |
a->last_dc[component] += diff; |
block[0] = a->last_dc[component] << 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, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); |
|
if (level == 127) { |
break; |
} else if (level != 0) { |
i += run; |
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; |
j = scantable[i]; |
if (level < 0) { |
level = -level; |
level = (level * qscale * quant_matrix[j]) >> 3; |
level = (level - 1) | 1; |
level = -level; |
} else { |
level = (level * qscale * quant_matrix[j]) >> 3; |
level = (level - 1) | 1; |
} |
} |
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; |
} |
|
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->dsp.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->dsp.idct_put(dest_y, linesize, block[0]); |
a->dsp.idct_put(dest_y + 8, linesize, block[1]); |
a->dsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); |
a->dsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); |
|
if (!(a->avctx->flags & CODEC_FLAG_GRAY)) { |
a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]); |
a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]); |
} |
} |
|
static int decode_frame(AVCodecContext *avctx, |
void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
MDECContext * const a = avctx->priv_data; |
const uint8_t *buf = avpkt->data; |
int buf_size = avpkt->size; |
ThreadFrame frame = { .f = data }; |
int i, ret; |
|
if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
return ret; |
frame.f->pict_type = AV_PICTURE_TYPE_I; |
frame.f->key_frame = 1; |
|
av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
if (!a->bitstream_buffer) |
return AVERROR(ENOMEM); |
for (i = 0; i < buf_size; i += 2) { |
a->bitstream_buffer[i] = buf[i + 1]; |
a->bitstream_buffer[i + 1] = buf[i]; |
} |
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.f, 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; |
|
a->mb_width = (avctx->coded_width + 15) / 16; |
a->mb_height = (avctx->coded_height + 15) / 16; |
|
a->avctx = avctx; |
|
ff_dsputil_init(&a->dsp, avctx); |
ff_mpeg12_init_vlcs(); |
ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct); |
|
if (avctx->idct_algo == FF_IDCT_AUTO) |
avctx->idct_algo = FF_IDCT_SIMPLE; |
avctx->pix_fmt = AV_PIX_FMT_YUVJ420P; |
|
return 0; |
} |
|
static av_cold int decode_init_thread_copy(AVCodecContext *avctx) |
{ |
MDECContext * const a = avctx->priv_data; |
|
a->avctx = avctx; |
|
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; |
} |
|
AVCodec ff_mdec_decoder = { |
.name = "mdec", |
.long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_MDEC, |
.priv_data_size = sizeof(MDECContext), |
.init = decode_init, |
.close = decode_end, |
.decode = decode_frame, |
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, |
.init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy) |
}; |