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Diffstat (limited to 'ffmpeg/libavcodec/xxan.c')
-rw-r--r--ffmpeg/libavcodec/xxan.c451
1 files changed, 0 insertions, 451 deletions
diff --git a/ffmpeg/libavcodec/xxan.c b/ffmpeg/libavcodec/xxan.c
deleted file mode 100644
index b261cdf..0000000
--- a/ffmpeg/libavcodec/xxan.c
+++ /dev/null
@@ -1,451 +0,0 @@
-/*
- * Wing Commander/Xan Video Decoder
- * Copyright (C) 2011 Konstantin Shishkov
- * based on work by Mike Melanson
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "avcodec.h"
-#include "libavutil/intreadwrite.h"
-#include "libavutil/mem.h"
-#include "bytestream.h"
-#define BITSTREAM_READER_LE
-#include "get_bits.h"
-#include "internal.h"
-
-typedef struct XanContext {
- AVCodecContext *avctx;
- AVFrame *pic;
-
- uint8_t *y_buffer;
- uint8_t *scratch_buffer;
- int buffer_size;
- GetByteContext gb;
-} XanContext;
-
-static av_cold int xan_decode_end(AVCodecContext *avctx)
-{
- XanContext *s = avctx->priv_data;
-
- av_frame_free(&s->pic);
-
- av_freep(&s->y_buffer);
- av_freep(&s->scratch_buffer);
-
- return 0;
-}
-
-static av_cold int xan_decode_init(AVCodecContext *avctx)
-{
- XanContext *s = avctx->priv_data;
-
- s->avctx = avctx;
-
- avctx->pix_fmt = AV_PIX_FMT_YUV420P;
-
- if (avctx->height < 8) {
- av_log(avctx, AV_LOG_ERROR, "Invalid frame height: %d.\n", avctx->height);
- return AVERROR(EINVAL);
- }
- if (avctx->width & 1) {
- av_log(avctx, AV_LOG_ERROR, "Invalid frame width: %d.\n", avctx->width);
- return AVERROR(EINVAL);
- }
-
- s->buffer_size = avctx->width * avctx->height;
- s->y_buffer = av_malloc(s->buffer_size);
- if (!s->y_buffer)
- return AVERROR(ENOMEM);
- s->scratch_buffer = av_malloc(s->buffer_size + 130);
- if (!s->scratch_buffer) {
- xan_decode_end(avctx);
- return AVERROR(ENOMEM);
- }
-
- s->pic = av_frame_alloc();
- if (!s->pic) {
- xan_decode_end(avctx);
- return AVERROR(ENOMEM);
- }
-
- return 0;
-}
-
-static int xan_unpack_luma(XanContext *s,
- uint8_t *dst, const int dst_size)
-{
- int tree_size, eof;
- int bits, mask;
- int tree_root, node;
- const uint8_t *dst_end = dst + dst_size;
- GetByteContext tree = s->gb;
- int start_off = bytestream2_tell(&tree);
-
- tree_size = bytestream2_get_byte(&s->gb);
- eof = bytestream2_get_byte(&s->gb);
- tree_root = eof + tree_size;
- bytestream2_skip(&s->gb, tree_size * 2);
-
- node = tree_root;
- bits = bytestream2_get_byte(&s->gb);
- mask = 0x80;
- for (;;) {
- int bit = !!(bits & mask);
- mask >>= 1;
- bytestream2_seek(&tree, start_off + node*2 + bit - eof * 2, SEEK_SET);
- node = bytestream2_get_byte(&tree);
- if (node == eof)
- break;
- if (node < eof) {
- *dst++ = node;
- if (dst > dst_end)
- break;
- node = tree_root;
- }
- if (!mask) {
- if (bytestream2_get_bytes_left(&s->gb) <= 0)
- break;
- bits = bytestream2_get_byteu(&s->gb);
- mask = 0x80;
- }
- }
- return dst != dst_end ? AVERROR_INVALIDDATA : 0;
-}
-
-/* almost the same as in xan_wc3 decoder */
-static int xan_unpack(XanContext *s,
- uint8_t *dest, const int dest_len)
-{
- uint8_t opcode;
- int size;
- uint8_t *orig_dest = dest;
- const uint8_t *dest_end = dest + dest_len;
-
- while (dest < dest_end) {
- if (bytestream2_get_bytes_left(&s->gb) <= 0)
- return AVERROR_INVALIDDATA;
-
- opcode = bytestream2_get_byteu(&s->gb);
-
- if (opcode < 0xe0) {
- int size2, back;
- if ((opcode & 0x80) == 0) {
- size = opcode & 3;
- back = ((opcode & 0x60) << 3) + bytestream2_get_byte(&s->gb) + 1;
- size2 = ((opcode & 0x1c) >> 2) + 3;
- } else if ((opcode & 0x40) == 0) {
- size = bytestream2_peek_byte(&s->gb) >> 6;
- back = (bytestream2_get_be16(&s->gb) & 0x3fff) + 1;
- size2 = (opcode & 0x3f) + 4;
- } else {
- size = opcode & 3;
- back = ((opcode & 0x10) << 12) + bytestream2_get_be16(&s->gb) + 1;
- size2 = ((opcode & 0x0c) << 6) + bytestream2_get_byte(&s->gb) + 5;
- if (size + size2 > dest_end - dest)
- break;
- }
- if (dest + size + size2 > dest_end ||
- dest - orig_dest + size < back)
- return AVERROR_INVALIDDATA;
- bytestream2_get_buffer(&s->gb, dest, size);
- dest += size;
- av_memcpy_backptr(dest, back, size2);
- dest += size2;
- } else {
- int finish = opcode >= 0xfc;
-
- size = finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4;
- if (dest_end - dest < size)
- return AVERROR_INVALIDDATA;
- bytestream2_get_buffer(&s->gb, dest, size);
- dest += size;
- if (finish)
- break;
- }
- }
- return dest - orig_dest;
-}
-
-static int xan_decode_chroma(AVCodecContext *avctx, unsigned chroma_off)
-{
- XanContext *s = avctx->priv_data;
- uint8_t *U, *V;
- int val, uval, vval;
- int i, j;
- const uint8_t *src, *src_end;
- const uint8_t *table;
- int mode, offset, dec_size, table_size;
-
- if (!chroma_off)
- return 0;
- if (chroma_off + 4 >= bytestream2_get_bytes_left(&s->gb)) {
- av_log(avctx, AV_LOG_ERROR, "Invalid chroma block position\n");
- return AVERROR_INVALIDDATA;
- }
- bytestream2_seek(&s->gb, chroma_off + 4, SEEK_SET);
- mode = bytestream2_get_le16(&s->gb);
- table = s->gb.buffer;
- table_size = bytestream2_get_le16(&s->gb);
- offset = table_size * 2;
- table_size += 1;
-
- if (offset >= bytestream2_get_bytes_left(&s->gb)) {
- av_log(avctx, AV_LOG_ERROR, "Invalid chroma block offset\n");
- return AVERROR_INVALIDDATA;
- }
-
- bytestream2_skip(&s->gb, offset);
- memset(s->scratch_buffer, 0, s->buffer_size);
- dec_size = xan_unpack(s, s->scratch_buffer, s->buffer_size);
- if (dec_size < 0) {
- av_log(avctx, AV_LOG_ERROR, "Chroma unpacking failed\n");
- return dec_size;
- }
-
- U = s->pic->data[1];
- V = s->pic->data[2];
- src = s->scratch_buffer;
- src_end = src + dec_size;
- if (mode) {
- for (j = 0; j < avctx->height >> 1; j++) {
- for (i = 0; i < avctx->width >> 1; i++) {
- if (src_end - src < 1)
- return 0;
- val = *src++;
- if (val) {
- if (val >= table_size)
- return AVERROR_INVALIDDATA;
- val = AV_RL16(table + (val << 1));
- uval = (val >> 3) & 0xF8;
- vval = (val >> 8) & 0xF8;
- U[i] = uval | (uval >> 5);
- V[i] = vval | (vval >> 5);
- }
- }
- U += s->pic->linesize[1];
- V += s->pic->linesize[2];
- }
- if (avctx->height & 1) {
- memcpy(U, U - s->pic->linesize[1], avctx->width >> 1);
- memcpy(V, V - s->pic->linesize[2], avctx->width >> 1);
- }
- } else {
- uint8_t *U2 = U + s->pic->linesize[1];
- uint8_t *V2 = V + s->pic->linesize[2];
-
- for (j = 0; j < avctx->height >> 2; j++) {
- for (i = 0; i < avctx->width >> 1; i += 2) {
- if (src_end - src < 1)
- return 0;
- val = *src++;
- if (val) {
- if (val >= table_size)
- return AVERROR_INVALIDDATA;
- val = AV_RL16(table + (val << 1));
- uval = (val >> 3) & 0xF8;
- vval = (val >> 8) & 0xF8;
- U[i] = U[i+1] = U2[i] = U2[i+1] = uval | (uval >> 5);
- V[i] = V[i+1] = V2[i] = V2[i+1] = vval | (vval >> 5);
- }
- }
- U += s->pic->linesize[1] * 2;
- V += s->pic->linesize[2] * 2;
- U2 += s->pic->linesize[1] * 2;
- V2 += s->pic->linesize[2] * 2;
- }
- if (avctx->height & 3) {
- int lines = ((avctx->height + 1) >> 1) - (avctx->height >> 2) * 2;
-
- memcpy(U, U - lines * s->pic->linesize[1], lines * s->pic->linesize[1]);
- memcpy(V, V - lines * s->pic->linesize[2], lines * s->pic->linesize[2]);
- }
- }
-
- return 0;
-}
-
-static int xan_decode_frame_type0(AVCodecContext *avctx)
-{
- XanContext *s = avctx->priv_data;
- uint8_t *ybuf, *prev_buf, *src = s->scratch_buffer;
- unsigned chroma_off, corr_off;
- int cur, last;
- int i, j;
- int ret;
-
- chroma_off = bytestream2_get_le32(&s->gb);
- corr_off = bytestream2_get_le32(&s->gb);
-
- if ((ret = xan_decode_chroma(avctx, chroma_off)) != 0)
- return ret;
-
- if (corr_off >= bytestream2_size(&s->gb)) {
- av_log(avctx, AV_LOG_WARNING, "Ignoring invalid correction block position\n");
- corr_off = 0;
- }
- bytestream2_seek(&s->gb, 12, SEEK_SET);
- ret = xan_unpack_luma(s, src, s->buffer_size >> 1);
- if (ret) {
- av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n");
- return ret;
- }
-
- ybuf = s->y_buffer;
- last = *src++;
- ybuf[0] = last << 1;
- for (j = 1; j < avctx->width - 1; j += 2) {
- cur = (last + *src++) & 0x1F;
- ybuf[j] = last + cur;
- ybuf[j+1] = cur << 1;
- last = cur;
- }
- ybuf[j] = last << 1;
- prev_buf = ybuf;
- ybuf += avctx->width;
-
- for (i = 1; i < avctx->height; i++) {
- last = ((prev_buf[0] >> 1) + *src++) & 0x1F;
- ybuf[0] = last << 1;
- for (j = 1; j < avctx->width - 1; j += 2) {
- cur = ((prev_buf[j + 1] >> 1) + *src++) & 0x1F;
- ybuf[j] = last + cur;
- ybuf[j+1] = cur << 1;
- last = cur;
- }
- ybuf[j] = last << 1;
- prev_buf = ybuf;
- ybuf += avctx->width;
- }
-
- if (corr_off) {
- int dec_size;
-
- bytestream2_seek(&s->gb, 8 + corr_off, SEEK_SET);
- dec_size = xan_unpack(s, s->scratch_buffer, s->buffer_size / 2);
- if (dec_size < 0)
- dec_size = 0;
- else
- dec_size = FFMIN(dec_size, s->buffer_size/2 - 1);
-
- for (i = 0; i < dec_size; i++)
- s->y_buffer[i*2+1] = (s->y_buffer[i*2+1] + (s->scratch_buffer[i] << 1)) & 0x3F;
- }
-
- src = s->y_buffer;
- ybuf = s->pic->data[0];
- for (j = 0; j < avctx->height; j++) {
- for (i = 0; i < avctx->width; i++)
- ybuf[i] = (src[i] << 2) | (src[i] >> 3);
- src += avctx->width;
- ybuf += s->pic->linesize[0];
- }
-
- return 0;
-}
-
-static int xan_decode_frame_type1(AVCodecContext *avctx)
-{
- XanContext *s = avctx->priv_data;
- uint8_t *ybuf, *src = s->scratch_buffer;
- int cur, last;
- int i, j;
- int ret;
-
- if ((ret = xan_decode_chroma(avctx, bytestream2_get_le32(&s->gb))) != 0)
- return ret;
-
- bytestream2_seek(&s->gb, 16, SEEK_SET);
- ret = xan_unpack_luma(s, src,
- s->buffer_size >> 1);
- if (ret) {
- av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n");
- return ret;
- }
-
- ybuf = s->y_buffer;
- for (i = 0; i < avctx->height; i++) {
- last = (ybuf[0] + (*src++ << 1)) & 0x3F;
- ybuf[0] = last;
- for (j = 1; j < avctx->width - 1; j += 2) {
- cur = (ybuf[j + 1] + (*src++ << 1)) & 0x3F;
- ybuf[j] = (last + cur) >> 1;
- ybuf[j+1] = cur;
- last = cur;
- }
- ybuf[j] = last;
- ybuf += avctx->width;
- }
-
- src = s->y_buffer;
- ybuf = s->pic->data[0];
- for (j = 0; j < avctx->height; j++) {
- for (i = 0; i < avctx->width; i++)
- ybuf[i] = (src[i] << 2) | (src[i] >> 3);
- src += avctx->width;
- ybuf += s->pic->linesize[0];
- }
-
- return 0;
-}
-
-static int xan_decode_frame(AVCodecContext *avctx,
- void *data, int *got_frame,
- AVPacket *avpkt)
-{
- XanContext *s = avctx->priv_data;
- int ftype;
- int ret;
-
- if ((ret = ff_reget_buffer(avctx, s->pic)) < 0)
- return ret;
-
- bytestream2_init(&s->gb, avpkt->data, avpkt->size);
- ftype = bytestream2_get_le32(&s->gb);
- switch (ftype) {
- case 0:
- ret = xan_decode_frame_type0(avctx);
- break;
- case 1:
- ret = xan_decode_frame_type1(avctx);
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "Unknown frame type %d\n", ftype);
- return AVERROR_INVALIDDATA;
- }
- if (ret)
- return ret;
-
- if ((ret = av_frame_ref(data, s->pic)) < 0)
- return ret;
-
- *got_frame = 1;
-
- return avpkt->size;
-}
-
-AVCodec ff_xan_wc4_decoder = {
- .name = "xan_wc4",
- .long_name = NULL_IF_CONFIG_SMALL("Wing Commander IV / Xxan"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_XAN_WC4,
- .priv_data_size = sizeof(XanContext),
- .init = xan_decode_init,
- .close = xan_decode_end,
- .decode = xan_decode_frame,
- .capabilities = CODEC_CAP_DR1,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 10:18:55 +0000