| /* |
| * 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; |
| } |
| |
| #if HAVE_THREADS |
| static av_cold int decode_init_thread_copy(AVCodecContext *avctx) |
| { |
| MDECContext * const a = avctx->priv_data; |
| |
| a->avctx = avctx; |
| |
| return 0; |
| } |
| #endif |
| |
| 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, |
| .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy) |
| }; |
