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FFmpeg/libavcodec/mdec.c
Anton Khirnov 1f4cf92cfb pthread_frame: merge the functionality for normal decoder init and init_thread_copy 
The current design, where
- proper init is called for the first per-thread context
- first thread's private data is copied into private data for all the
  other threads
- a "fixup" function is called for all the other threads to e.g.
  allocate dynamically allocated data
is very fragile and hard to follow, so it is abandoned. Instead, the
same init function is used to init each per-thread context. Where
necessary, AVCodecInternal.is_copy can be used to differentiate between
the first thread and the other ones (e.g. for decoding the extradata
just once).
2020-04-10 15:24:54 +02:00

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/*
* 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 "blockdsp.h"
#include "bswapdsp.h"
#include "idctdsp.h"
#include "mpeg12.h"
#include "thread.h"
typedef struct MDECContext {
AVCodecContext *avctx;
BlockDSPContext bdsp;
BswapDSPContext bbdsp;
IDCTDSPContext idsp;
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(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;
RLTable *rl = &ff_rl_mpeg1;
uint8_t * const scantable = a->scantable.permutated;
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);
if (diff >= 0xffff)
return AVERROR_INVALIDDATA;
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, rl->rl_vlc[0], 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,
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 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_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.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;
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, avctx);
ff_bswapdsp_init(&a->bbdsp);
ff_idctdsp_init(&a->idsp, avctx);
ff_mpeg12_init_vlcs();
ff_init_scantable(a->idsp.idct_permutation, &a->scantable,
ff_zigzag_direct);
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;
}
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 = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
};
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