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357 lines
10 KiB
357 lines
10 KiB
/* |
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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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#define BITSTREAM_READER_LE |
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#include "avcodec.h" |
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#include "bitstream.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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static 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(BitstreamContext *bc) |
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{ |
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int value; |
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value = bitstream_read_bit(bc); |
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if (value) |
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return 0; |
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value = bitstream_read(bc, 3); |
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if (value) |
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return value; |
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value = bitstream_read(bc, 8); |
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if (value) |
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return value + 7; |
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value = bitstream_read(bc, 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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BitstreamContext bc; |
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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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bitstream_init(&bc, 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(&bc); |
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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 (bitstream_read_bit(&bc)) { |
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unsigned sign_selector = bitstream_read(&bc, 6); |
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unsigned difference_selector = bitstream_read(&bc, 2); |
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y_avg = 2 * bitstream_read(&bc, 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 (bitstream_read_bit(&bc)) { |
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if (bitstream_read_bit(&bc)) { |
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y_avg = bitstream_read(&bc, 6); |
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} else { |
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unsigned adjust_index = bitstream_read(&bc, 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 (bitstream_read_bit(&bc)) { |
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if (bitstream_read_bit(&bc)) { |
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cb = bitstream_read(&bc, 5); |
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cr = bitstream_read(&bc, 5); |
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} else { |
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unsigned adjust_index = bitstream_read(&bc, 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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ff_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n", |
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buf_size, bitstream_tell(&bc) >> 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 = AV_CODEC_CAP_DR1, |
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};
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