Xan4 decoder
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit 44ddfd47d6)
This commit is contained in:
Kostya Shishkov
Michael Niedermayer
parent
14d735bd4f
commit
abb5f2b7bf
@ -74,6 +74,7 @@ version <next>:
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- Lagarith decoder
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- ffmpeg -copytb option added
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- IVF muxer added
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- Wing Commander IV movies decoder added
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version 0.6:
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@ -511,6 +511,8 @@ following image formats are supported:
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@tab not completely working
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@item Wing Commander III / Xan @tab @tab X
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@tab Used in Wing Commander III .MVE files.
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@item Wing Commander IV / Xan @tab @tab X
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@tab Used in Wing Commander IV.
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@item Winnov WNV1 @tab @tab X
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@item WMV7 @tab X @tab X
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@item YAMAHA SMAF @tab X @tab X
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@ -415,7 +415,7 @@ OBJS-$(CONFIG_WNV1_DECODER) += wnv1.o
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OBJS-$(CONFIG_WS_SND1_DECODER) += ws-snd1.o
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OBJS-$(CONFIG_XAN_DPCM_DECODER) += dpcm.o
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OBJS-$(CONFIG_XAN_WC3_DECODER) += xan.o
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OBJS-$(CONFIG_XAN_WC4_DECODER) += xan.o
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OBJS-$(CONFIG_XAN_WC4_DECODER) += xxan.o
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OBJS-$(CONFIG_XL_DECODER) += xl.o
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OBJS-$(CONFIG_XSUB_DECODER) += xsubdec.o
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OBJS-$(CONFIG_XSUB_ENCODER) += xsubenc.o
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@ -214,6 +214,7 @@ void avcodec_register_all(void)
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REGISTER_DECODER (WMV3_VDPAU, wmv3_vdpau);
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REGISTER_DECODER (WNV1, wnv1);
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REGISTER_DECODER (XAN_WC3, xan_wc3);
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REGISTER_DECODER (XAN_WC4, xan_wc4);
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REGISTER_DECODER (XL, xl);
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REGISTER_DECODER (YOP, yop);
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REGISTER_ENCDEC (ZLIB, zlib);
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@ -32,7 +32,7 @@
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#include "libavutil/cpu.h"
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#define LIBAVCODEC_VERSION_MAJOR 52
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#define LIBAVCODEC_VERSION_MINOR 109
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#define LIBAVCODEC_VERSION_MINOR 110
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#define LIBAVCODEC_VERSION_MICRO 0
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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429
libavcodec/xxan.c
Normal file
429
libavcodec/xxan.c
Normal file
@ -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);
|
||||
*(AVFrame*)data = s->pic;
|
||||
|
||||
return avpkt->size;
|
||||
}
|
||||
|
||||
static av_cold int xan_decode_end(AVCodecContext *avctx)
|
||||
{
|
||||
XanContext *s = avctx->priv_data;
|
||||
|
||||
if (s->pic.data[0])
|
||||
avctx->release_buffer(avctx, &s->pic);
|
||||
|
||||
av_freep(&s->y_buffer);
|
||||
av_freep(&s->scratch_buffer);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVCodec ff_xan_wc4_decoder = {
|
||||
"xan_wc4",
|
||||
AVMEDIA_TYPE_VIDEO,
|
||||
CODEC_ID_XAN_WC4,
|
||||
sizeof(XanContext),
|
||||
xan_decode_init,
|
||||
NULL,
|
||||
xan_decode_end,
|
||||
xan_decode_frame,
|
||||
CODEC_CAP_DR1,
|
||||
.long_name = NULL_IF_CONFIG_SMALL("Wing Commander IV / Xxan"),
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user