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Diffstat (limited to 'ffmpeg/libavcodec/cyuv.c')
| -rw-r--r-- | ffmpeg/libavcodec/cyuv.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/cyuv.c b/ffmpeg/libavcodec/cyuv.c new file mode 100644 index 0000000..3a30138 --- /dev/null +++ b/ffmpeg/libavcodec/cyuv.c @@ -0,0 +1,202 @@ +/* + * 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 + * + * 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 + * Creative YUV (CYUV) Video Decoder. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "avcodec.h" +#include "internal.h" +#include "libavutil/internal.h" + + +typedef struct CyuvDecodeContext { + AVCodecContext *avctx; + int width, height; +} CyuvDecodeContext; + +static av_cold int cyuv_decode_init(AVCodecContext *avctx) +{ + CyuvDecodeContext *s = avctx->priv_data; + + s->avctx = avctx; + s->width = avctx->width; + /* width needs to be divisible by 4 for this codec to work */ + if (s->width & 0x3) + return AVERROR_INVALIDDATA; + s->height = avctx->height; + + return 0; +} + +static int cyuv_decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + CyuvDecodeContext *s=avctx->priv_data; + AVFrame *frame = 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) */ + const signed char *y_table = (const signed char*)buf + 0; + const signed char *u_table = (const signed char*)buf + 16; + const signed char *v_table = (const signed char*)buf + 32; + + unsigned char y_pred, u_pred, v_pred; + int stream_ptr; + unsigned char cur_byte; + int pixel_groups; + int rawsize = s->height * FFALIGN(s->width,2) * 2; + int ret; + + if (avctx->codec_id == AV_CODEC_ID_AURA) { + y_table = u_table; + u_table = v_table; + } + /* 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)) { + avctx->pix_fmt = AV_PIX_FMT_YUV411P; + } else if(buf_size == rawsize ) { + avctx->pix_fmt = AV_PIX_FMT_UYVY422; + } else { + av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n", + buf_size, 48 + s->height * (s->width * 3 / 4)); + return AVERROR_INVALIDDATA; + } + + /* pixel data starts 48 bytes in, after 3x16-byte tables */ + stream_ptr = 48; + + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + y_plane = frame->data[0]; + u_plane = frame->data[1]; + v_plane = frame->data[2]; + + if (buf_size == rawsize) { + int linesize = FFALIGN(s->width,2) * 2; + y_plane += frame->linesize[0] * s->height; + for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) { + y_plane -= frame->linesize[0]; + memcpy(y_plane, buf+stream_ptr, linesize); + } + } else { + + /* iterate through each line in the height */ + for (y_ptr = 0, u_ptr = 0, v_ptr = 0; + y_ptr < (s->height * frame->linesize[0]); + y_ptr += frame->linesize[0] - s->width, + u_ptr += frame->linesize[1] - s->width / 4, + v_ptr += 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; + + } + } + } + + *got_frame = 1; + + return buf_size; +} + +#if CONFIG_AURA_DECODER +AVCodec ff_aura_decoder = { + .name = "aura", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_AURA, + .priv_data_size = sizeof(CyuvDecodeContext), + .init = cyuv_decode_init, + .decode = cyuv_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Auravision AURA"), +}; +#endif + +#if CONFIG_CYUV_DECODER +AVCodec ff_cyuv_decoder = { + .name = "cyuv", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_CYUV, + .priv_data_size = sizeof(CyuvDecodeContext), + .init = cyuv_decode_init, + .decode = cyuv_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Creative YUV (CYUV)"), +}; +#endif |