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Diffstat (limited to 'src/libffmpeg/libavcodec/xan.c')
-rw-r--r--src/libffmpeg/libavcodec/xan.c492
1 files changed, 0 insertions, 492 deletions
diff --git a/src/libffmpeg/libavcodec/xan.c b/src/libffmpeg/libavcodec/xan.c
deleted file mode 100644
index f697514a0..000000000
--- a/src/libffmpeg/libavcodec/xan.c
+++ /dev/null
@@ -1,492 +0,0 @@
-/*
- * Wing Commander/Xan Video Decoder
- * Copyright (C) 2003 the ffmpeg project
- *
- * 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
- *
- */
-
-/**
- * @file xan.c
- * Xan video decoder for Wing Commander III computer game
- * by Mario Brito (mbrito@student.dei.uc.pt)
- * and Mike Melanson (melanson@pcisys.net)
- *
- * The xan_wc3 decoder outputs PAL8 data.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "common.h"
-#include "avcodec.h"
-
-typedef struct XanContext {
-
- AVCodecContext *avctx;
- AVFrame last_frame;
- AVFrame current_frame;
-
- unsigned char *buf;
- int size;
-
- /* scratch space */
- unsigned char *buffer1;
- int buffer1_size;
- unsigned char *buffer2;
- int buffer2_size;
-
- int frame_size;
-
-} XanContext;
-
-static int xan_decode_init(AVCodecContext *avctx)
-{
- XanContext *s = avctx->priv_data;
-
- s->avctx = avctx;
- s->frame_size = 0;
-
- if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
- (s->avctx->palctrl == NULL)) {
- av_log(avctx, AV_LOG_ERROR, " WC3 Xan video: palette expected.\n");
- return -1;
- }
-
- avctx->pix_fmt = PIX_FMT_PAL8;
- avctx->has_b_frames = 0;
-
- if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
- return -1;
-
- s->buffer1_size = avctx->width * avctx->height;
- s->buffer1 = av_malloc(s->buffer1_size);
- s->buffer2_size = avctx->width * avctx->height;
- s->buffer2 = av_malloc(s->buffer2_size);
- if (!s->buffer1 || !s->buffer2)
- return -1;
-
- return 0;
-}
-
-/* This function is used in lieu of memcpy(). This decoder can not use
- * memcpy because the memory locations often overlap and
- * memcpy doesn't like that; it's not uncommon, for example, for
- * dest = src+1, to turn byte A into pattern AAAAAAAA.
- * This was originally repz movsb in Intel x86 ASM. */
-static inline void bytecopy(unsigned char *dest, unsigned char *src, int count)
-{
- int i;
-
- for (i = 0; i < count; i++)
- dest[i] = src[i];
-}
-
-static int xan_huffman_decode(unsigned char *dest, unsigned char *src,
- int dest_len)
-{
- unsigned char byte = *src++;
- unsigned char ival = byte + 0x16;
- unsigned char * ptr = src + byte*2;
- unsigned char val = ival;
- int counter = 0;
- unsigned char *dest_end = dest + dest_len;
-
- unsigned char bits = *ptr++;
-
- while ( val != 0x16 ) {
- if ( (1 << counter) & bits )
- val = src[byte + val - 0x17];
- else
- val = src[val - 0x17];
-
- if ( val < 0x16 ) {
- if (dest + 1 > dest_end)
- return 0;
- *dest++ = val;
- val = ival;
- }
-
- if (counter++ == 7) {
- counter = 0;
- bits = *ptr++;
- }
- }
-
- return 0;
-}
-
-static void xan_unpack(unsigned char *dest, unsigned char *src, int dest_len)
-{
- unsigned char opcode;
- int size;
- int offset;
- int byte1, byte2, byte3;
- unsigned char *dest_end = dest + dest_len;
-
- for (;;) {
- opcode = *src++;
-
- if ( (opcode & 0x80) == 0 ) {
-
- offset = *src++;
-
- size = opcode & 3;
- if (dest + size > dest_end)
- return;
- bytecopy(dest, src, size); dest += size; src += size;
-
- size = ((opcode & 0x1c) >> 2) + 3;
- if (dest + size > dest_end)
- return;
- bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size);
- dest += size;
-
- } else if ( (opcode & 0x40) == 0 ) {
-
- byte1 = *src++;
- byte2 = *src++;
-
- size = byte1 >> 6;
- if (dest + size > dest_end)
- return;
- bytecopy (dest, src, size); dest += size; src += size;
-
- size = (opcode & 0x3f) + 4;
- if (dest + size > dest_end)
- return;
- bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size);
- dest += size;
-
- } else if ( (opcode & 0x20) == 0 ) {
-
- byte1 = *src++;
- byte2 = *src++;
- byte3 = *src++;
-
- size = opcode & 3;
- if (dest + size > dest_end)
- return;
- bytecopy (dest, src, size); dest += size; src += size;
-
- size = byte3 + 5 + ((opcode & 0xc) << 6);
- if (dest + size > dest_end)
- return;
- bytecopy (dest,
- dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2),
- size);
- dest += size;
- } else {
- size = ((opcode & 0x1f) << 2) + 4;
-
- if (size > 0x70)
- break;
-
- if (dest + size > dest_end)
- return;
- bytecopy (dest, src, size); dest += size; src += size;
- }
- }
-
- size = opcode & 3;
- bytecopy(dest, src, size); dest += size; src += size;
-}
-
-static void inline xan_wc3_output_pixel_run(XanContext *s,
- unsigned char *pixel_buffer, int x, int y, int pixel_count)
-{
- int stride;
- int line_inc;
- int index;
- int current_x;
- int width = s->avctx->width;
- unsigned char *palette_plane;
-
- palette_plane = s->current_frame.data[0];
- stride = s->current_frame.linesize[0];
- line_inc = stride - width;
- index = y * stride + x;
- current_x = x;
- while((pixel_count--) && (index < s->frame_size)) {
-
- /* don't do a memcpy() here; keyframes generally copy an entire
- * frame of data and the stride needs to be accounted for */
- palette_plane[index++] = *pixel_buffer++;
-
- current_x++;
- if (current_x >= width) {
- index += line_inc;
- current_x = 0;
- }
- }
-}
-
-static void inline xan_wc3_copy_pixel_run(XanContext *s,
- int x, int y, int pixel_count, int motion_x, int motion_y)
-{
- int stride;
- int line_inc;
- int curframe_index, prevframe_index;
- int curframe_x, prevframe_x;
- int width = s->avctx->width;
- unsigned char *palette_plane, *prev_palette_plane;
-
- palette_plane = s->current_frame.data[0];
- prev_palette_plane = s->last_frame.data[0];
- stride = s->current_frame.linesize[0];
- line_inc = stride - width;
- curframe_index = y * stride + x;
- curframe_x = x;
- prevframe_index = (y + motion_y) * stride + x + motion_x;
- prevframe_x = x + motion_x;
- while((pixel_count--) && (curframe_index < s->frame_size)) {
-
- palette_plane[curframe_index++] =
- prev_palette_plane[prevframe_index++];
-
- curframe_x++;
- if (curframe_x >= width) {
- curframe_index += line_inc;
- curframe_x = 0;
- }
-
- prevframe_x++;
- if (prevframe_x >= width) {
- prevframe_index += line_inc;
- prevframe_x = 0;
- }
- }
-}
-
-static void xan_wc3_decode_frame(XanContext *s) {
-
- int width = s->avctx->width;
- int height = s->avctx->height;
- int total_pixels = width * height;
- unsigned char opcode;
- unsigned char flag = 0;
- int size = 0;
- int motion_x, motion_y;
- int x, y;
-
- unsigned char *opcode_buffer = s->buffer1;
- int opcode_buffer_size = s->buffer1_size;
- unsigned char *imagedata_buffer = s->buffer2;
- int imagedata_buffer_size = s->buffer2_size;
-
- /* pointers to segments inside the compressed chunk */
- unsigned char *huffman_segment;
- unsigned char *size_segment;
- unsigned char *vector_segment;
- unsigned char *imagedata_segment;
-
- huffman_segment = s->buf + AV_RL16(&s->buf[0]);
- size_segment = s->buf + AV_RL16(&s->buf[2]);
- vector_segment = s->buf + AV_RL16(&s->buf[4]);
- imagedata_segment = s->buf + AV_RL16(&s->buf[6]);
-
- xan_huffman_decode(opcode_buffer, huffman_segment, opcode_buffer_size);
-
- if (imagedata_segment[0] == 2)
- xan_unpack(imagedata_buffer, &imagedata_segment[1],
- imagedata_buffer_size);
- else
- imagedata_buffer = &imagedata_segment[1];
-
- /* use the decoded data segments to build the frame */
- x = y = 0;
- while (total_pixels) {
-
- opcode = *opcode_buffer++;
- size = 0;
-
- switch (opcode) {
-
- case 0:
- flag ^= 1;
- continue;
-
- case 1:
- case 2:
- case 3:
- case 4:
- case 5:
- case 6:
- case 7:
- case 8:
- size = opcode;
- break;
-
- case 12:
- case 13:
- case 14:
- case 15:
- case 16:
- case 17:
- case 18:
- size += (opcode - 10);
- break;
-
- case 9:
- case 19:
- size = *size_segment++;
- break;
-
- case 10:
- case 20:
- size = AV_RB16(&size_segment[0]);
- size_segment += 2;
- break;
-
- case 11:
- case 21:
- size = (size_segment[0] << 16) | (size_segment[1] << 8) |
- size_segment[2];
- size_segment += 3;
- break;
- }
-
- if (opcode < 12) {
- flag ^= 1;
- if (flag) {
- /* run of (size) pixels is unchanged from last frame */
- xan_wc3_copy_pixel_run(s, x, y, size, 0, 0);
- } else {
- /* output a run of pixels from imagedata_buffer */
- xan_wc3_output_pixel_run(s, imagedata_buffer, x, y, size);
- imagedata_buffer += size;
- }
- } else {
- /* run-based motion compensation from last frame */
- motion_x = (*vector_segment >> 4) & 0xF;
- motion_y = *vector_segment & 0xF;
- vector_segment++;
-
- /* sign extension */
- if (motion_x & 0x8)
- motion_x |= 0xFFFFFFF0;
- if (motion_y & 0x8)
- motion_y |= 0xFFFFFFF0;
-
- /* copy a run of pixels from the previous frame */
- xan_wc3_copy_pixel_run(s, x, y, size, motion_x, motion_y);
-
- flag = 0;
- }
-
- /* coordinate accounting */
- total_pixels -= size;
- while (size) {
- if (x + size >= width) {
- y++;
- size -= (width - x);
- x = 0;
- } else {
- x += size;
- size = 0;
- }
- }
- }
-}
-
-static void xan_wc4_decode_frame(XanContext *s) {
-}
-
-static int xan_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- XanContext *s = avctx->priv_data;
- AVPaletteControl *palette_control = avctx->palctrl;
-
- if (avctx->get_buffer(avctx, &s->current_frame)) {
- av_log(s->avctx, AV_LOG_ERROR, " Xan Video: get_buffer() failed\n");
- return -1;
- }
- s->current_frame.reference = 3;
-
- if (!s->frame_size)
- s->frame_size = s->current_frame.linesize[0] * s->avctx->height;
-
- palette_control->palette_changed = 0;
- memcpy(s->current_frame.data[1], palette_control->palette,
- AVPALETTE_SIZE);
- s->current_frame.palette_has_changed = 1;
-
- s->buf = buf;
- s->size = buf_size;
-
- if (avctx->codec->id == CODEC_ID_XAN_WC3)
- xan_wc3_decode_frame(s);
- else if (avctx->codec->id == CODEC_ID_XAN_WC4)
- xan_wc4_decode_frame(s);
-
- /* release the last frame if it is allocated */
- if (s->last_frame.data[0])
- avctx->release_buffer(avctx, &s->last_frame);
-
- /* shuffle frames */
- s->last_frame = s->current_frame;
-
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->current_frame;
-
- /* always report that the buffer was completely consumed */
- return buf_size;
-}
-
-static int xan_decode_end(AVCodecContext *avctx)
-{
- XanContext *s = avctx->priv_data;
-
- /* release the last frame */
- if (s->last_frame.data[0])
- avctx->release_buffer(avctx, &s->last_frame);
-
- av_free(s->buffer1);
- av_free(s->buffer2);
-
- return 0;
-}
-
-AVCodec xan_wc3_decoder = {
- "xan_wc3",
- CODEC_TYPE_VIDEO,
- CODEC_ID_XAN_WC3,
- sizeof(XanContext),
- xan_decode_init,
- NULL,
- xan_decode_end,
- xan_decode_frame,
- CODEC_CAP_DR1,
-};
-
-/*
-AVCodec xan_wc4_decoder = {
- "xan_wc4",
- CODEC_TYPE_VIDEO,
- CODEC_ID_XAN_WC4,
- sizeof(XanContext),
- xan_decode_init,
- NULL,
- xan_decode_end,
- xan_decode_frame,
- CODEC_CAP_DR1,
-};
-*/
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 14:08:36 +0000