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https://github.com/FFmpeg/FFmpeg.git
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266 lines
8.3 KiB
C
266 lines
8.3 KiB
C
/*
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* Sony PlayStation MDEC (Motion DECoder)
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* Copyright (c) 2003 Michael Niedermayer
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*
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* based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Sony PlayStation MDEC (Motion DECoder)
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* This is very similar to intra-only MPEG-1.
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*/
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#include "libavutil/mem_internal.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "bswapdsp.h"
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#include "idctdsp.h"
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#include "mpeg12.h"
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#include "mpeg12data.h"
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#include "thread.h"
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typedef struct MDECContext {
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AVCodecContext *avctx;
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BlockDSPContext bdsp;
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BswapDSPContext bbdsp;
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IDCTDSPContext idsp;
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ThreadFrame frame;
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GetBitContext gb;
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ScanTable scantable;
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int version;
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int qscale;
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int last_dc[3];
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int mb_width;
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int mb_height;
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int mb_x, mb_y;
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DECLARE_ALIGNED(32, int16_t, block)[6][64];
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DECLARE_ALIGNED(16, uint16_t, quant_matrix)[64];
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uint8_t *bitstream_buffer;
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unsigned int bitstream_buffer_size;
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int block_last_index[6];
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} MDECContext;
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//very similar to MPEG-1
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static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
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{
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int level, diff, i, j, run;
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int component;
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RLTable *rl = &ff_rl_mpeg1;
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uint8_t * const scantable = a->scantable.permutated;
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const uint16_t *quant_matrix = a->quant_matrix;
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const int qscale = a->qscale;
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/* DC coefficient */
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if (a->version == 2) {
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block[0] = 2 * get_sbits(&a->gb, 10) + 1024;
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} else {
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component = (n <= 3 ? 0 : n - 4 + 1);
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diff = decode_dc(&a->gb, component);
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a->last_dc[component] += diff;
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block[0] = a->last_dc[component] * (1 << 3);
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}
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i = 0;
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{
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OPEN_READER(re, &a->gb);
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/* now quantify & encode AC coefficients */
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for (;;) {
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UPDATE_CACHE(re, &a->gb);
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GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
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if (level == 127) {
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break;
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} else if (level != 0) {
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i += run;
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if (i > 63) {
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av_log(a->avctx, AV_LOG_ERROR,
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"ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
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return AVERROR_INVALIDDATA;
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}
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j = scantable[i];
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level = (level * qscale * quant_matrix[j]) >> 3;
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level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
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LAST_SKIP_BITS(re, &a->gb, 1);
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} else {
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/* escape */
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run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
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UPDATE_CACHE(re, &a->gb);
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level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
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i += run;
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if (i > 63) {
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av_log(a->avctx, AV_LOG_ERROR,
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"ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
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return AVERROR_INVALIDDATA;
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}
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j = scantable[i];
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if (level < 0) {
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level = -level;
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level = (level * (unsigned)qscale * quant_matrix[j]) >> 3;
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level = (level - 1) | 1;
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level = -level;
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} else {
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level = (level * (unsigned)qscale * quant_matrix[j]) >> 3;
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level = (level - 1) | 1;
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}
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}
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block[j] = level;
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}
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CLOSE_READER(re, &a->gb);
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}
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a->block_last_index[n] = i;
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return 0;
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}
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static inline int decode_mb(MDECContext *a, int16_t block[6][64])
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{
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int i, ret;
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static const int block_index[6] = { 5, 4, 0, 1, 2, 3 };
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a->bdsp.clear_blocks(block[0]);
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for (i = 0; i < 6; i++) {
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if ((ret = mdec_decode_block_intra(a, block[block_index[i]],
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block_index[i])) < 0)
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return ret;
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if (get_bits_left(&a->gb) < 0)
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y)
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{
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int16_t (*block)[64] = a->block;
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int linesize = frame->linesize[0];
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uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
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uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
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uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
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a->idsp.idct_put(dest_y, linesize, block[0]);
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a->idsp.idct_put(dest_y + 8, linesize, block[1]);
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a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
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a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
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if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
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a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
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a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
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}
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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MDECContext * const a = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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ThreadFrame frame = { .f = data };
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int ret;
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if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
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return ret;
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frame.f->pict_type = AV_PICTURE_TYPE_I;
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frame.f->key_frame = 1;
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av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size);
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if (!a->bitstream_buffer)
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return AVERROR(ENOMEM);
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a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2);
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if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0)
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return ret;
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/* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
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skip_bits(&a->gb, 32);
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a->qscale = get_bits(&a->gb, 16);
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a->version = get_bits(&a->gb, 16);
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a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128;
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for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) {
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for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) {
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if ((ret = decode_mb(a, a->block)) < 0)
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return ret;
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idct_put(a, frame.f, a->mb_x, a->mb_y);
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}
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}
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*got_frame = 1;
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return (get_bits_count(&a->gb) + 31) / 32 * 4;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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MDECContext * const a = avctx->priv_data;
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int i;
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a->mb_width = (avctx->coded_width + 15) / 16;
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a->mb_height = (avctx->coded_height + 15) / 16;
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a->avctx = avctx;
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ff_blockdsp_init(&a->bdsp, avctx);
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ff_bswapdsp_init(&a->bbdsp);
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ff_idctdsp_init(&a->idsp, avctx);
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ff_mpeg12_init_vlcs();
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ff_init_scantable(a->idsp.idct_permutation, &a->scantable,
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ff_zigzag_direct);
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avctx->pix_fmt = AV_PIX_FMT_YUVJ420P;
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avctx->color_range = AVCOL_RANGE_JPEG;
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/* init q matrix */
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for (i = 0; i < 64; i++) {
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int j = a->idsp.idct_permutation[i];
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a->quant_matrix[j] = ff_mpeg1_default_intra_matrix[i];
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}
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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MDECContext * const a = avctx->priv_data;
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av_freep(&a->bitstream_buffer);
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a->bitstream_buffer_size = 0;
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return 0;
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}
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const AVCodec ff_mdec_decoder = {
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.name = "mdec",
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.long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MDEC,
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.priv_data_size = sizeof(MDECContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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