X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;ds=sidebyside;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fcyuv.c;fp=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fcyuv.c;h=d1a6eabf2a7f9f8a491ede44d23204ecf885044d;hb=16b3beced25134bef064705568ecb893a6be4e79;hp=0000000000000000000000000000000000000000;hpb=5a1d028f56182922addfed8f1f1c28fdde12756c;p=synfig.git diff --git a/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/cyuv.c b/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/cyuv.c new file mode 100644 index 0000000..d1a6eab --- /dev/null +++ b/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/cyuv.c @@ -0,0 +1,186 @@ +/* + * + * 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 +#include +#include +#include + +#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 +}; +