mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit 44ddfd47d6)
oldabi
Kostya Shishkov
14 years ago
committed by
Michael Niedermayer
parent
14d735bd4f
commit
abb5f2b7bf
6 changed files with 435 additions and 2 deletions
@ -0,0 +1,429 @@ |
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/*
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* Wing Commander/Xan Video Decoder |
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* Copyright (C) 2011 Konstantin Shishkov |
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* based on work by Mike Melanson |
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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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#include "avcodec.h" |
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#include "libavutil/intreadwrite.h" |
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#include "bytestream.h" |
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#define ALT_BITSTREAM_READER_LE |
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#include "get_bits.h" |
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// for av_memcpy_backptr
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#include "libavutil/lzo.h" |
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typedef struct XanContext { |
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AVCodecContext *avctx; |
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AVFrame pic; |
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uint8_t *y_buffer; |
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uint8_t *scratch_buffer; |
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int buffer_size; |
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} XanContext; |
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static av_cold int xan_decode_init(AVCodecContext *avctx) |
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{ |
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XanContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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avctx->pix_fmt = PIX_FMT_YUV420P; |
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s->buffer_size = avctx->width * avctx->height; |
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s->y_buffer = av_malloc(s->buffer_size); |
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if (!s->y_buffer) |
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return AVERROR(ENOMEM); |
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s->scratch_buffer = av_malloc(s->buffer_size + 130); |
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if (!s->scratch_buffer) { |
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av_freep(&s->y_buffer); |
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return AVERROR(ENOMEM); |
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} |
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return 0; |
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} |
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static int xan_unpack_luma(const uint8_t *src, const int src_size, |
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uint8_t *dst, const int dst_size) |
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{ |
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int tree_size, eof; |
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const uint8_t *tree; |
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int bits, mask; |
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int tree_root, node; |
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const uint8_t *dst_end = dst + dst_size; |
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const uint8_t *src_end = src + src_size; |
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tree_size = *src++; |
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eof = *src++; |
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tree = src - eof * 2 - 2; |
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tree_root = eof + tree_size; |
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src += tree_size * 2; |
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node = tree_root; |
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bits = *src++; |
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mask = 0x80; |
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for (;;) { |
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int bit = !!(bits & mask); |
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mask >>= 1; |
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node = tree[node*2 + bit]; |
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if (node == eof) |
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break; |
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if (node < eof) { |
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*dst++ = node; |
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if (dst > dst_end) |
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break; |
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node = tree_root; |
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} |
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if (!mask) { |
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bits = *src++; |
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if (src > src_end) |
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break; |
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mask = 0x80; |
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} |
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} |
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return dst != dst_end; |
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} |
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/* almost the same as in xan_wc3 decoder */ |
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static int xan_unpack(uint8_t *dest, const int dest_len, |
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const uint8_t *src, const int src_len) |
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{ |
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uint8_t opcode; |
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int size; |
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uint8_t *orig_dest = dest; |
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const uint8_t *src_end = src + src_len; |
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const uint8_t *dest_end = dest + dest_len; |
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while (dest < dest_end) { |
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opcode = *src++; |
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if (opcode < 0xe0) { |
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int size2, back; |
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if ((opcode & 0x80) == 0) { |
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size = opcode & 3; |
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back = ((opcode & 0x60) << 3) + *src++ + 1; |
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size2 = ((opcode & 0x1c) >> 2) + 3; |
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} else if ((opcode & 0x40) == 0) { |
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size = *src >> 6; |
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back = (bytestream_get_be16(&src) & 0x3fff) + 1; |
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size2 = (opcode & 0x3f) + 4; |
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} else { |
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size = opcode & 3; |
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back = ((opcode & 0x10) << 12) + bytestream_get_be16(&src) + 1; |
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size2 = ((opcode & 0x0c) << 6) + *src++ + 5; |
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if (size + size2 > dest_end - dest) |
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break; |
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} |
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if (src + size > src_end || dest + size + size2 > dest_end) |
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return -1; |
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bytestream_get_buffer(&src, dest, size); |
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dest += size; |
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av_memcpy_backptr(dest, back, size2); |
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dest += size2; |
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} else { |
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int finish = opcode >= 0xfc; |
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size = finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4; |
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if (src + size > src_end || dest + size > dest_end) |
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return -1; |
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bytestream_get_buffer(&src, dest, size); |
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dest += size; |
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if (finish) |
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break; |
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} |
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} |
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return dest - orig_dest; |
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} |
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static int xan_decode_chroma(AVCodecContext *avctx, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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XanContext *s = avctx->priv_data; |
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uint8_t *U, *V; |
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unsigned chroma_off; |
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int val, uval, vval; |
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int i, j; |
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const uint8_t *src, *src_end; |
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const uint8_t *table; |
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int mode, offset, dec_size; |
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chroma_off = AV_RL32(buf + 4); |
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if (!chroma_off) |
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return 0; |
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if (chroma_off + 10 >= avpkt->size) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid chroma block position\n"); |
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return -1; |
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} |
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src = avpkt->data + 4 + chroma_off; |
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table = src + 2; |
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mode = bytestream_get_le16(&src); |
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offset = bytestream_get_le16(&src) * 2; |
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if (src - avpkt->data >= avpkt->size - offset) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid chroma block offset\n"); |
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return -1; |
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} |
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memset(s->scratch_buffer, 0, s->buffer_size); |
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dec_size = xan_unpack(s->scratch_buffer, s->buffer_size, src + offset, |
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avpkt->size - offset - (src - avpkt->data)); |
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if (dec_size < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Chroma unpacking failed\n"); |
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return -1; |
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} |
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U = s->pic.data[1]; |
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V = s->pic.data[2]; |
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src = s->scratch_buffer; |
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src_end = src + dec_size; |
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if (mode) { |
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for (j = 0; j < avctx->height >> 1; j++) { |
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for (i = 0; i < avctx->width >> 1; i++) { |
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val = *src++; |
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if (val) { |
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val = AV_RL16(table + (val << 1)); |
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uval = (val >> 3) & 0xF8; |
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vval = (val >> 8) & 0xF8; |
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U[i] = uval | (uval >> 5); |
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V[i] = vval | (vval >> 5); |
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} |
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if (src == src_end) |
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return 0; |
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} |
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U += s->pic.linesize[1]; |
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V += s->pic.linesize[2]; |
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} |
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} else { |
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uint8_t *U2 = U + s->pic.linesize[1]; |
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uint8_t *V2 = V + s->pic.linesize[2]; |
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for (j = 0; j < avctx->height >> 2; j++) { |
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for (i = 0; i < avctx->width >> 1; i += 2) { |
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val = *src++; |
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if (val) { |
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val = AV_RL16(table + (val << 1)); |
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uval = (val >> 3) & 0xF8; |
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vval = (val >> 8) & 0xF8; |
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U[i] = U[i+1] = U2[i] = U2[i+1] = uval | (uval >> 5); |
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V[i] = V[i+1] = V2[i] = V2[i+1] = vval | (vval >> 5); |
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} |
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} |
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U += s->pic.linesize[1] * 2; |
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V += s->pic.linesize[2] * 2; |
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U2 += s->pic.linesize[1] * 2; |
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V2 += s->pic.linesize[2] * 2; |
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} |
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} |
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return 0; |
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} |
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static int xan_decode_frame_type0(AVCodecContext *avctx, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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XanContext *s = avctx->priv_data; |
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uint8_t *ybuf, *prev_buf, *src = s->scratch_buffer; |
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unsigned chroma_off, corr_off; |
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int cur, last, size; |
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int i, j; |
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int ret; |
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corr_off = AV_RL32(buf + 8); |
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chroma_off = AV_RL32(buf + 4); |
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if ((ret = xan_decode_chroma(avctx, avpkt)) != 0) |
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return ret; |
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size = avpkt->size - 4; |
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if (corr_off >= avpkt->size) { |
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av_log(avctx, AV_LOG_WARNING, "Ignoring invalid correction block position\n"); |
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corr_off = 0; |
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} |
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if (corr_off) |
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size = corr_off; |
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if (chroma_off) |
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size = FFMIN(size, chroma_off); |
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ret = xan_unpack_luma(buf + 12, size, src, s->buffer_size >> 1); |
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if (ret) { |
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av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n"); |
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return ret; |
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} |
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ybuf = s->y_buffer; |
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last = *src++; |
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ybuf[0] = last << 1; |
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for (j = 1; j < avctx->width - 1; j += 2) { |
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cur = (last + *src++) & 0x1F; |
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ybuf[j] = last + cur; |
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ybuf[j+1] = cur << 1; |
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last = cur; |
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} |
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ybuf[j] = last << 1; |
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prev_buf = ybuf; |
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ybuf += avctx->width; |
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for (i = 1; i < avctx->height; i++) { |
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last = ((prev_buf[0] >> 1) + *src++) & 0x1F; |
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ybuf[0] = last << 1; |
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for (j = 1; j < avctx->width - 1; j += 2) { |
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cur = ((prev_buf[j + 1] >> 1) + *src++) & 0x1F; |
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ybuf[j] = last + cur; |
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ybuf[j+1] = cur << 1; |
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last = cur; |
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} |
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ybuf[j] = last << 1; |
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prev_buf = ybuf; |
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ybuf += avctx->width; |
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} |
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if (corr_off) { |
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int corr_end, dec_size; |
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corr_end = avpkt->size; |
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if (chroma_off > corr_off) |
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corr_end = chroma_off; |
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dec_size = xan_unpack(s->scratch_buffer, s->buffer_size, |
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avpkt->data + 8 + corr_off, |
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corr_end - corr_off); |
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if (dec_size < 0) |
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dec_size = 0; |
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for (i = 0; i < dec_size; i++) |
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s->y_buffer[i*2+1] = (s->y_buffer[i*2+1] + (s->scratch_buffer[i] << 1)) & 0x3F; |
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} |
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src = s->y_buffer; |
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ybuf = s->pic.data[0]; |
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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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ybuf[i] = (src[i] << 2) | (src[i] >> 3); |
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src += avctx->width; |
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ybuf += s->pic.linesize[0]; |
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} |
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return 0; |
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} |
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static int xan_decode_frame_type1(AVCodecContext *avctx, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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XanContext *s = avctx->priv_data; |
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uint8_t *ybuf, *src = s->scratch_buffer; |
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int cur, last; |
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int i, j; |
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int ret; |
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if ((ret = xan_decode_chroma(avctx, avpkt)) != 0) |
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return ret; |
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ret = xan_unpack_luma(buf + 16, avpkt->size - 16, src, |
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s->buffer_size >> 1); |
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if (ret) { |
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av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n"); |
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return ret; |
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} |
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ybuf = s->y_buffer; |
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for (i = 0; i < avctx->height; i++) { |
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last = (ybuf[0] + (*src++ << 1)) & 0x3F; |
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ybuf[0] = last; |
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for (j = 1; j < avctx->width - 1; j += 2) { |
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cur = (ybuf[j + 1] + (*src++ << 1)) & 0x3F; |
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ybuf[j] = (last + cur) >> 1; |
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ybuf[j+1] = cur; |
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last = cur; |
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} |
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ybuf[j] = last; |
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ybuf += avctx->width; |
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} |
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src = s->y_buffer; |
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ybuf = s->pic.data[0]; |
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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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ybuf[i] = (src[i] << 2) | (src[i] >> 3); |
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src += avctx->width; |
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ybuf += s->pic.linesize[0]; |
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} |
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return 0; |
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} |
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static int xan_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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XanContext *s = avctx->priv_data; |
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int ftype; |
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int ret; |
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s->pic.reference = 1; |
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s->pic.buffer_hints = FF_BUFFER_HINTS_VALID | |
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FF_BUFFER_HINTS_PRESERVE | |
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FF_BUFFER_HINTS_REUSABLE; |
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if ((ret = avctx->reget_buffer(avctx, &s->pic))) { |
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av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
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return ret; |
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} |
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ftype = AV_RL32(avpkt->data); |
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switch (ftype) { |
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case 0: |
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ret = xan_decode_frame_type0(avctx, avpkt); |
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break; |
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case 1: |
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ret = xan_decode_frame_type1(avctx, avpkt); |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "Unknown frame type %d\n", ftype); |
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return -1; |
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} |
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if (ret) |
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return ret; |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = s->pic; |
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return avpkt->size; |
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} |
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static av_cold int xan_decode_end(AVCodecContext *avctx) |
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{ |
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XanContext *s = avctx->priv_data; |
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if (s->pic.data[0]) |
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avctx->release_buffer(avctx, &s->pic); |
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av_freep(&s->y_buffer); |
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av_freep(&s->scratch_buffer); |
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return 0; |
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} |
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AVCodec ff_xan_wc4_decoder = { |
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"xan_wc4", |
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_XAN_WC4, |
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sizeof(XanContext), |
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xan_decode_init, |
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NULL, |
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xan_decode_end, |
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xan_decode_frame, |
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CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Wing Commander IV / Xxan"), |
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}; |
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