summaryrefslogtreecommitdiff
path: root/src/libffmpeg/libavcodec/flashsv.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libffmpeg/libavcodec/flashsv.c')
-rw-r--r--src/libffmpeg/libavcodec/flashsv.c260
1 files changed, 0 insertions, 260 deletions
diff --git a/src/libffmpeg/libavcodec/flashsv.c b/src/libffmpeg/libavcodec/flashsv.c
deleted file mode 100644
index 9e4aa951a..000000000
--- a/src/libffmpeg/libavcodec/flashsv.c
+++ /dev/null
@@ -1,260 +0,0 @@
-/*
- * Flash Screen Video decoder
- * Copyright (C) 2004 Alex Beregszaszi
- * Copyright (C) 2006 Benjamin Larsson
- *
- * 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 flashsv.c
- * Flash Screen Video decoder
- * @author Alex Beregszaszi
- * @author Benjamin Larsson
- */
-
-/* Bitstream description
- * The picture is divided into blocks that are zlib compressed.
- *
- * The decoder is fed complete frames, the frameheader contains:
- * 4bits of block width
- * 12bits of frame width
- * 4bits of block height
- * 12bits of frame height
- *
- * Directly after the header are the compressed blocks. The blocks
- * have their compressed size represented with 16bits in the beginnig.
- * If the size = 0 then the block is unchanged from the previous frame.
- * All blocks are decompressed until the buffer is consumed.
- *
- * Encoding ideas, a basic encoder would just use a fixed block size.
- * Block sizes can be multipels of 16, from 16 to 256. The blocks don't
- * have to be quadratic. A brute force search with a set of diffrent
- * block sizes should give a better result then to just use a fixed size.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "common.h"
-#include "avcodec.h"
-#include "bitstream.h"
-
-#include <zlib.h>
-
-typedef struct FlashSVContext {
- AVCodecContext *avctx;
- AVFrame frame;
- int image_width, image_height;
- int block_width, block_height;
- uint8_t* tmpblock;
- int block_size;
- z_stream zstream;
-} FlashSVContext;
-
-
-static void copy_region(uint8_t *sptr, uint8_t *dptr,
- int dx, int dy, int h, int w, int stride)
-{
- int i;
-
- for (i = dx+h; i > dx; i--)
- {
- memcpy(dptr+(i*stride)+dy*3, sptr, w*3);
- sptr += w*3;
- }
-}
-
-
-static int flashsv_decode_init(AVCodecContext *avctx)
-{
- FlashSVContext *s = (FlashSVContext *)avctx->priv_data;
- int zret; // Zlib return code
-
- s->avctx = avctx;
- s->zstream.zalloc = Z_NULL;
- s->zstream.zfree = Z_NULL;
- s->zstream.opaque = Z_NULL;
- zret = inflateInit(&(s->zstream));
- if (zret != Z_OK) {
- av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
- return 1;
- }
- avctx->pix_fmt = PIX_FMT_BGR24;
- avctx->has_b_frames = 0;
- s->frame.data[0] = NULL;
-
- return 0;
-}
-
-
-static int flashsv_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- FlashSVContext *s = (FlashSVContext *)avctx->priv_data;
- int h_blocks, v_blocks, h_part, v_part, i, j;
- GetBitContext gb;
-
- /* no supplementary picture */
- if (buf_size == 0)
- return 0;
-
- if(s->frame.data[0])
- avctx->release_buffer(avctx, &s->frame);
-
- init_get_bits(&gb, buf, buf_size * 8);
-
- /* start to parse the bitstream */
- s->block_width = 16* (get_bits(&gb, 4)+1);
- s->image_width = get_bits(&gb,12);
- s->block_height= 16* (get_bits(&gb, 4)+1);
- s->image_height= get_bits(&gb,12);
-
- /* calculate amount of blocks and the size of the border blocks */
- h_blocks = s->image_width / s->block_width;
- h_part = s->image_width % s->block_width;
- v_blocks = s->image_height / s->block_height;
- v_part = s->image_height % s->block_height;
-
- /* the block size could change between frames, make sure the buffer
- * is large enough, if not, get a larger one */
- if(s->block_size < s->block_width*s->block_height) {
- if (s->tmpblock != NULL)
- av_free(s->tmpblock);
- if ((s->tmpblock = av_malloc(3*s->block_width*s->block_height)) == NULL) {
- av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
- return -1;
- }
- }
- s->block_size = s->block_width*s->block_height;
-
- /* init the image size once */
- if((avctx->width==0) && (avctx->height==0)){
- avctx->width = s->image_width;
- avctx->height = s->image_height;
- }
-
- /* check for changes of image width and image height */
- if ((avctx->width != s->image_width) || (avctx->height != s->image_height)) {
- av_log(avctx, AV_LOG_ERROR, "Frame width or height differs from first frames!\n");
- av_log(avctx, AV_LOG_ERROR, "fh = %d, fv %d vs ch = %d, cv = %d\n",avctx->height,
- avctx->width,s->image_height,s->image_width);
- return -1;
- }
-
- av_log(avctx, AV_LOG_DEBUG, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",
- s->image_width, s->image_height, s->block_width, s->block_height,
- h_blocks, v_blocks, h_part, v_part);
-
- s->frame.reference = 1;
- s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
- if (avctx->get_buffer(avctx, &s->frame) < 0) {
- av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
- }
-
- /* loop over all block columns */
- for (j = 0; j < v_blocks + (v_part?1:0); j++)
- {
-
- int hp = j*s->block_height; // horiz position in frame
- int hs = (j<v_blocks)?s->block_height:v_part; // size of block
-
-
- /* loop over all block rows */
- for (i = 0; i < h_blocks + (h_part?1:0); i++)
- {
- int wp = i*s->block_width; // vert position in frame
- int ws = (i<h_blocks)?s->block_width:h_part; // size of block
-
- /* get the size of the compressed zlib chunk */
- int size = get_bits(&gb, 16);
-
- if (size == 0) {
- /* no change, don't do anything */
- } else {
- /* decompress block */
- int ret = inflateReset(&(s->zstream));
- if (ret != Z_OK)
- {
- av_log(avctx, AV_LOG_ERROR, "error in decompression (reset) of block %dx%d\n", i, j);
- /* return -1; */
- }
- s->zstream.next_in = buf+(get_bits_count(&gb)/8);
- s->zstream.avail_in = size;
- s->zstream.next_out = s->tmpblock;
- s->zstream.avail_out = s->block_size*3;
- ret = inflate(&(s->zstream), Z_FINISH);
- if (ret == Z_DATA_ERROR)
- {
- av_log(avctx, AV_LOG_ERROR, "Zlib resync occured\n");
- inflateSync(&(s->zstream));
- ret = inflate(&(s->zstream), Z_FINISH);
- }
-
- if ((ret != Z_OK) && (ret != Z_STREAM_END))
- {
- av_log(avctx, AV_LOG_ERROR, "error in decompression of block %dx%d: %d\n", i, j, ret);
- /* return -1; */
- }
- copy_region(s->tmpblock, s->frame.data[0], s->image_height-(hp+hs+1), wp, hs, ws, s->frame.linesize[0]);
- skip_bits(&gb, 8*size); /* skip the consumed bits */
- }
- }
- }
-
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->frame;
-
- if ((get_bits_count(&gb)/8) != buf_size)
- av_log(avctx, AV_LOG_ERROR, "buffer not fully consumed (%d != %d)\n",
- buf_size, (get_bits_count(&gb)/8));
-
- /* report that the buffer was completely consumed */
- return buf_size;
-}
-
-
-static int flashsv_decode_end(AVCodecContext *avctx)
-{
- FlashSVContext *s = (FlashSVContext *)avctx->priv_data;
- inflateEnd(&(s->zstream));
- /* release the frame if needed */
- if (s->frame.data[0])
- avctx->release_buffer(avctx, &s->frame);
-
- /* free the tmpblock */
- if (s->tmpblock != NULL)
- av_free(s->tmpblock);
-
- return 0;
-}
-
-
-AVCodec flashsv_decoder = {
- "flashsv",
- CODEC_TYPE_VIDEO,
- CODEC_ID_FLASHSV,
- sizeof(FlashSVContext),
- flashsv_decode_init,
- NULL,
- flashsv_decode_end,
- flashsv_decode_frame,
- CODEC_CAP_DR1,
- .pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, -1},
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 14:10:29 +0000