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357 lines
10 KiB
C
357 lines
10 KiB
C
/*
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* Escape 130 video decoder
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* Copyright (C) 2008 Eli Friedman (eli.friedman <at> gmail.com)
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "libavutil/attributes.h"
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#define BITSTREAM_READER_LE
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#include "get_bits.h"
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#include "internal.h"
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typedef struct Escape130Context {
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uint8_t *old_y_avg;
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uint8_t *new_y, *old_y;
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uint8_t *new_u, *old_u;
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uint8_t *new_v, *old_v;
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uint8_t *buf1, *buf2;
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int linesize[3];
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} Escape130Context;
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static const uint8_t offset_table[] = { 2, 4, 10, 20 };
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static const int8_t sign_table[64][4] = {
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{ 0, 0, 0, 0 },
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{ -1, 1, 0, 0 },
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{ 1, -1, 0, 0 },
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{ -1, 0, 1, 0 },
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{ -1, 1, 1, 0 },
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{ 0, -1, 1, 0 },
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{ 1, -1, 1, 0 },
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{ -1, -1, 1, 0 },
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{ 1, 0, -1, 0 },
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{ 0, 1, -1, 0 },
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{ 1, 1, -1, 0 },
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{ -1, 1, -1, 0 },
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{ 1, -1, -1, 0 },
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{ -1, 0, 0, 1 },
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{ -1, 1, 0, 1 },
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{ 0, -1, 0, 1 },
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{ 0, 0, 0, 0 },
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{ 1, -1, 0, 1 },
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{ -1, -1, 0, 1 },
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{ -1, 0, 1, 1 },
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{ -1, 1, 1, 1 },
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{ 0, -1, 1, 1 },
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{ 1, -1, 1, 1 },
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{ -1, -1, 1, 1 },
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{ 0, 0, -1, 1 },
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{ 1, 0, -1, 1 },
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{ -1, 0, -1, 1 },
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{ 0, 1, -1, 1 },
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{ 1, 1, -1, 1 },
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{ -1, 1, -1, 1 },
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{ 0, -1, -1, 1 },
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{ 1, -1, -1, 1 },
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{ 0, 0, 0, 0 },
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{ -1, -1, -1, 1 },
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{ 1, 0, 0, -1 },
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{ 0, 1, 0, -1 },
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{ 1, 1, 0, -1 },
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{ -1, 1, 0, -1 },
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{ 1, -1, 0, -1 },
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{ 0, 0, 1, -1 },
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{ 1, 0, 1, -1 },
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{ -1, 0, 1, -1 },
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{ 0, 1, 1, -1 },
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{ 1, 1, 1, -1 },
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{ -1, 1, 1, -1 },
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{ 0, -1, 1, -1 },
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{ 1, -1, 1, -1 },
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{ -1, -1, 1, -1 },
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{ 0, 0, 0, 0 },
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{ 1, 0, -1, -1 },
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{ 0, 1, -1, -1 },
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{ 1, 1, -1, -1 },
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{ -1, 1, -1, -1 },
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{ 1, -1, -1, -1 }
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};
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static const int8_t luma_adjust[] = { -4, -3, -2, -1, 1, 2, 3, 4 };
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static const int8_t chroma_adjust[2][8] = {
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{ 1, 1, 0, -1, -1, -1, 0, 1 },
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{ 0, 1, 1, 1, 0, -1, -1, -1 }
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};
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const uint8_t chroma_vals[] = {
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20, 28, 36, 44, 52, 60, 68, 76,
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84, 92, 100, 106, 112, 116, 120, 124,
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128, 132, 136, 140, 144, 150, 156, 164,
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172, 180, 188, 196, 204, 212, 220, 228
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};
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static av_cold int escape130_decode_init(AVCodecContext *avctx)
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{
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Escape130Context *s = avctx->priv_data;
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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if ((avctx->width & 1) || (avctx->height & 1)) {
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av_log(avctx, AV_LOG_ERROR,
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"Dimensions should be a multiple of two.\n");
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return AVERROR_INVALIDDATA;
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}
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s->old_y_avg = av_malloc(avctx->width * avctx->height / 4);
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s->buf1 = av_malloc(avctx->width * avctx->height * 3 / 2);
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s->buf2 = av_malloc(avctx->width * avctx->height * 3 / 2);
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if (!s->old_y_avg || !s->buf1 || !s->buf2) {
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av_freep(&s->old_y_avg);
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av_freep(&s->buf1);
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av_freep(&s->buf2);
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av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
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return AVERROR(ENOMEM);
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}
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s->linesize[0] = avctx->width;
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s->linesize[1] =
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s->linesize[2] = avctx->width / 2;
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s->new_y = s->buf1;
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s->new_u = s->new_y + avctx->width * avctx->height;
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s->new_v = s->new_u + avctx->width * avctx->height / 4;
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s->old_y = s->buf2;
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s->old_u = s->old_y + avctx->width * avctx->height;
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s->old_v = s->old_u + avctx->width * avctx->height / 4;
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memset(s->old_y, 0, avctx->width * avctx->height);
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memset(s->old_u, 0x10, avctx->width * avctx->height / 4);
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memset(s->old_v, 0x10, avctx->width * avctx->height / 4);
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return 0;
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}
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static av_cold int escape130_decode_close(AVCodecContext *avctx)
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{
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Escape130Context *s = avctx->priv_data;
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av_freep(&s->old_y_avg);
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av_freep(&s->buf1);
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av_freep(&s->buf2);
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return 0;
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}
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static int decode_skip_count(GetBitContext* gb)
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{
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int value;
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value = get_bits1(gb);
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if (value)
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return 0;
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value = get_bits(gb, 3);
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if (value)
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return value;
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value = get_bits(gb, 8);
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if (value)
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return value + 7;
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value = get_bits(gb, 15);
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if (value)
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return value + 262;
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return -1;
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}
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static int escape130_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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Escape130Context *s = avctx->priv_data;
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AVFrame *pic = data;
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GetBitContext gb;
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int ret;
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uint8_t *old_y, *old_cb, *old_cr,
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*new_y, *new_cb, *new_cr;
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uint8_t *dstY, *dstU, *dstV;
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unsigned old_y_stride, old_cb_stride, old_cr_stride,
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new_y_stride, new_cb_stride, new_cr_stride;
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unsigned total_blocks = avctx->width * avctx->height / 4,
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block_index, block_x = 0;
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unsigned y[4] = { 0 }, cb = 0x10, cr = 0x10;
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int skip = -1, y_avg = 0, i, j;
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uint8_t *ya = s->old_y_avg;
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// first 16 bytes are header; no useful information in here
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if (buf_size <= 16) {
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av_log(avctx, AV_LOG_ERROR, "Insufficient frame data\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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init_get_bits(&gb, buf + 16, (buf_size - 16) * 8);
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new_y = s->new_y;
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new_cb = s->new_u;
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new_cr = s->new_v;
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new_y_stride = s->linesize[0];
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new_cb_stride = s->linesize[1];
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new_cr_stride = s->linesize[2];
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old_y = s->old_y;
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old_cb = s->old_u;
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old_cr = s->old_v;
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old_y_stride = s->linesize[0];
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old_cb_stride = s->linesize[1];
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old_cr_stride = s->linesize[2];
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for (block_index = 0; block_index < total_blocks; block_index++) {
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// Note that this call will make us skip the rest of the blocks
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// if the frame ends prematurely.
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if (skip == -1)
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skip = decode_skip_count(&gb);
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if (skip == -1) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding skip value\n");
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return AVERROR_INVALIDDATA;
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}
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if (skip) {
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y[0] = old_y[0];
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y[1] = old_y[1];
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y[2] = old_y[old_y_stride];
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y[3] = old_y[old_y_stride + 1];
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y_avg = ya[0];
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cb = old_cb[0];
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cr = old_cr[0];
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} else {
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if (get_bits1(&gb)) {
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unsigned sign_selector = get_bits(&gb, 6);
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unsigned difference_selector = get_bits(&gb, 2);
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y_avg = 2 * get_bits(&gb, 5);
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for (i = 0; i < 4; i++) {
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y[i] = av_clip(y_avg + offset_table[difference_selector] *
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sign_table[sign_selector][i], 0, 63);
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}
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} else if (get_bits1(&gb)) {
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if (get_bits1(&gb)) {
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y_avg = get_bits(&gb, 6);
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} else {
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unsigned adjust_index = get_bits(&gb, 3);
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y_avg = (y_avg + luma_adjust[adjust_index]) & 63;
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}
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for (i = 0; i < 4; i++)
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y[i] = y_avg;
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}
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if (get_bits1(&gb)) {
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if (get_bits1(&gb)) {
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cb = get_bits(&gb, 5);
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cr = get_bits(&gb, 5);
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} else {
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unsigned adjust_index = get_bits(&gb, 3);
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cb = (cb + chroma_adjust[0][adjust_index]) & 31;
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cr = (cr + chroma_adjust[1][adjust_index]) & 31;
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}
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}
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}
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*ya++ = y_avg;
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new_y[0] = y[0];
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new_y[1] = y[1];
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new_y[new_y_stride] = y[2];
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new_y[new_y_stride + 1] = y[3];
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*new_cb = cb;
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*new_cr = cr;
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old_y += 2;
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old_cb++;
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old_cr++;
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new_y += 2;
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new_cb++;
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new_cr++;
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block_x++;
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if (block_x * 2 == avctx->width) {
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block_x = 0;
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old_y += old_y_stride * 2 - avctx->width;
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old_cb += old_cb_stride - avctx->width / 2;
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old_cr += old_cr_stride - avctx->width / 2;
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new_y += new_y_stride * 2 - avctx->width;
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new_cb += new_cb_stride - avctx->width / 2;
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new_cr += new_cr_stride - avctx->width / 2;
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}
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skip--;
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}
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new_y = s->new_y;
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new_cb = s->new_u;
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new_cr = s->new_v;
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dstY = pic->data[0];
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dstU = pic->data[1];
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dstV = pic->data[2];
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for (j = 0; j < avctx->height; j++) {
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for (i = 0; i < avctx->width; i++)
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dstY[i] = new_y[i] << 2;
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dstY += pic->linesize[0];
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new_y += new_y_stride;
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}
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for (j = 0; j < avctx->height / 2; j++) {
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for (i = 0; i < avctx->width / 2; i++) {
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dstU[i] = chroma_vals[new_cb[i]];
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dstV[i] = chroma_vals[new_cr[i]];
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}
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dstU += pic->linesize[1];
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dstV += pic->linesize[2];
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new_cb += new_cb_stride;
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new_cr += new_cr_stride;
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}
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av_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n",
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buf_size, get_bits_count(&gb) >> 3);
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FFSWAP(uint8_t*, s->old_y, s->new_y);
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FFSWAP(uint8_t*, s->old_u, s->new_u);
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FFSWAP(uint8_t*, s->old_v, s->new_v);
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*got_frame = 1;
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return buf_size;
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}
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AVCodec ff_escape130_decoder = {
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.name = "escape130",
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.long_name = NULL_IF_CONFIG_SMALL("Escape 130"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ESCAPE130,
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.priv_data_size = sizeof(Escape130Context),
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.init = escape130_decode_init,
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.close = escape130_decode_close,
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.decode = escape130_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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