+++ /dev/null
-/*
- *
- * Copyright (C) 2003 the ffmpeg project
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Creative YUV (CYUV) Video Decoder
- * by Mike Melanson (melanson@pcisys.net)
- * based on "Creative YUV (CYUV) stream format for AVI":
- * http://www.csse.monash.edu.au/~timf/videocodec/cyuv.txt
- *
- */
-
-/**
- * @file cyuv.c
- * Creative YUV (CYUV) Video Decoder.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "common.h"
-#include "avcodec.h"
-#include "dsputil.h"
-#include "mpegvideo.h"
-
-
-typedef struct CyuvDecodeContext {
- AVCodecContext *avctx;
- int width, height;
- AVFrame frame;
-} CyuvDecodeContext;
-
-static int cyuv_decode_init(AVCodecContext *avctx)
-{
- CyuvDecodeContext *s = avctx->priv_data;
-
- s->avctx = avctx;
- s->width = avctx->width;
- s->height = avctx->height;
- avctx->pix_fmt = PIX_FMT_YUV411P;
- avctx->has_b_frames = 0;
-
- return 0;
-}
-
-static int cyuv_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- CyuvDecodeContext *s=avctx->priv_data;
-
- unsigned char *y_plane;
- unsigned char *u_plane;
- unsigned char *v_plane;
- int y_ptr;
- int u_ptr;
- int v_ptr;
-
- /* prediction error tables (make it clear that they are signed values) */
- signed char *y_table = buf + 0;
- signed char *u_table = buf + 16;
- signed char *v_table = buf + 32;
-
- unsigned char y_pred, u_pred, v_pred;
- int stream_ptr;
- unsigned char cur_byte;
- int pixel_groups;
-
- *data_size = 0;
-
- /* sanity check the buffer size: A buffer has 3x16-bytes tables
- * followed by (height) lines each with 3 bytes to represent groups
- * of 4 pixels. Thus, the total size of the buffer ought to be:
- * (3 * 16) + height * (width * 3 / 4) */
- if (buf_size != 48 + s->height * (s->width * 3 / 4)) {
- printf ("ffmpeg: cyuv: got a buffer with %d bytes when %d were expected\n",
- buf_size,
- 48 + s->height * (s->width * 3 / 4));
- return -1;
- }
-
- /* pixel data starts 48 bytes in, after 3x16-byte tables */
- stream_ptr = 48;
-
- if(s->frame.data[0])
- avctx->release_buffer(avctx, &s->frame);
-
- s->frame.reference = 0;
- if(avctx->get_buffer(avctx, &s->frame) < 0) {
- fprintf(stderr, "get_buffer() failed\n");
- return -1;
- }
-
- y_plane = s->frame.data[0];
- u_plane = s->frame.data[1];
- v_plane = s->frame.data[2];
-
- /* iterate through each line in the height */
- for (y_ptr = 0, u_ptr = 0, v_ptr = 0;
- y_ptr < (s->height * s->frame.linesize[0]);
- y_ptr += s->frame.linesize[0] - s->width,
- u_ptr += s->frame.linesize[1] - s->width / 4,
- v_ptr += s->frame.linesize[2] - s->width / 4) {
-
- /* reset predictors */
- cur_byte = buf[stream_ptr++];
- u_plane[u_ptr++] = u_pred = cur_byte & 0xF0;
- y_plane[y_ptr++] = y_pred = (cur_byte & 0x0F) << 4;
-
- cur_byte = buf[stream_ptr++];
- v_plane[v_ptr++] = v_pred = cur_byte & 0xF0;
- y_pred += y_table[cur_byte & 0x0F];
- y_plane[y_ptr++] = y_pred;
-
- cur_byte = buf[stream_ptr++];
- y_pred += y_table[cur_byte & 0x0F];
- y_plane[y_ptr++] = y_pred;
- y_pred += y_table[(cur_byte & 0xF0) >> 4];
- y_plane[y_ptr++] = y_pred;
-
- /* iterate through the remaining pixel groups (4 pixels/group) */
- pixel_groups = s->width / 4 - 1;
- while (pixel_groups--) {
-
- cur_byte = buf[stream_ptr++];
- u_pred += u_table[(cur_byte & 0xF0) >> 4];
- u_plane[u_ptr++] = u_pred;
- y_pred += y_table[cur_byte & 0x0F];
- y_plane[y_ptr++] = y_pred;
-
- cur_byte = buf[stream_ptr++];
- v_pred += v_table[(cur_byte & 0xF0) >> 4];
- v_plane[v_ptr++] = v_pred;
- y_pred += y_table[cur_byte & 0x0F];
- y_plane[y_ptr++] = y_pred;
-
- cur_byte = buf[stream_ptr++];
- y_pred += y_table[cur_byte & 0x0F];
- y_plane[y_ptr++] = y_pred;
- y_pred += y_table[(cur_byte & 0xF0) >> 4];
- y_plane[y_ptr++] = y_pred;
-
- }
- }
-
- *data_size=sizeof(AVFrame);
- *(AVFrame*)data= s->frame;
-
- return buf_size;
-}
-
-static int cyuv_decode_end(AVCodecContext *avctx)
-{
-/* CyuvDecodeContext *s = avctx->priv_data;*/
-
- return 0;
-}
-
-AVCodec cyuv_decoder = {
- "cyuv",
- CODEC_TYPE_VIDEO,
- CODEC_ID_CYUV,
- sizeof(CyuvDecodeContext),
- cyuv_decode_init,
- NULL,
- cyuv_decode_end,
- cyuv_decode_frame,
- 0,
- NULL
-};
-
projects / synfig.git / blobdiff