yading@10: /* yading@10: * Creative YUV (CYUV) Video Decoder yading@10: * by Mike Melanson (melanson@pcisys.net) yading@10: * based on "Creative YUV (CYUV) stream format for AVI": yading@10: * http://www.csse.monash.edu.au/~timf/videocodec/cyuv.txt yading@10: * yading@10: * Copyright (C) 2003 the ffmpeg project yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * Creative YUV (CYUV) Video Decoder. yading@10: */ yading@10: yading@10: #include yading@10: #include yading@10: #include yading@10: yading@10: #include "avcodec.h" yading@10: #include "internal.h" yading@10: #include "libavutil/internal.h" yading@10: yading@10: yading@10: typedef struct CyuvDecodeContext { yading@10: AVCodecContext *avctx; yading@10: int width, height; yading@10: } CyuvDecodeContext; yading@10: yading@10: static av_cold int cyuv_decode_init(AVCodecContext *avctx) yading@10: { yading@10: CyuvDecodeContext *s = avctx->priv_data; yading@10: yading@10: s->avctx = avctx; yading@10: s->width = avctx->width; yading@10: /* width needs to be divisible by 4 for this codec to work */ yading@10: if (s->width & 0x3) yading@10: return AVERROR_INVALIDDATA; yading@10: s->height = avctx->height; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int cyuv_decode_frame(AVCodecContext *avctx, yading@10: void *data, int *got_frame, yading@10: AVPacket *avpkt) yading@10: { yading@10: const uint8_t *buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: CyuvDecodeContext *s=avctx->priv_data; yading@10: AVFrame *frame = data; yading@10: yading@10: unsigned char *y_plane; yading@10: unsigned char *u_plane; yading@10: unsigned char *v_plane; yading@10: int y_ptr; yading@10: int u_ptr; yading@10: int v_ptr; yading@10: yading@10: /* prediction error tables (make it clear that they are signed values) */ yading@10: const signed char *y_table = (const signed char*)buf + 0; yading@10: const signed char *u_table = (const signed char*)buf + 16; yading@10: const signed char *v_table = (const signed char*)buf + 32; yading@10: yading@10: unsigned char y_pred, u_pred, v_pred; yading@10: int stream_ptr; yading@10: unsigned char cur_byte; yading@10: int pixel_groups; yading@10: int rawsize = s->height * FFALIGN(s->width,2) * 2; yading@10: int ret; yading@10: yading@10: if (avctx->codec_id == AV_CODEC_ID_AURA) { yading@10: y_table = u_table; yading@10: u_table = v_table; yading@10: } yading@10: /* sanity check the buffer size: A buffer has 3x16-bytes tables yading@10: * followed by (height) lines each with 3 bytes to represent groups yading@10: * of 4 pixels. Thus, the total size of the buffer ought to be: yading@10: * (3 * 16) + height * (width * 3 / 4) */ yading@10: if (buf_size == 48 + s->height * (s->width * 3 / 4)) { yading@10: avctx->pix_fmt = AV_PIX_FMT_YUV411P; yading@10: } else if(buf_size == rawsize ) { yading@10: avctx->pix_fmt = AV_PIX_FMT_UYVY422; yading@10: } else { yading@10: av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n", yading@10: buf_size, 48 + s->height * (s->width * 3 / 4)); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: /* pixel data starts 48 bytes in, after 3x16-byte tables */ yading@10: stream_ptr = 48; yading@10: yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: yading@10: y_plane = frame->data[0]; yading@10: u_plane = frame->data[1]; yading@10: v_plane = frame->data[2]; yading@10: yading@10: if (buf_size == rawsize) { yading@10: int linesize = FFALIGN(s->width,2) * 2; yading@10: y_plane += frame->linesize[0] * s->height; yading@10: for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) { yading@10: y_plane -= frame->linesize[0]; yading@10: memcpy(y_plane, buf+stream_ptr, linesize); yading@10: } yading@10: } else { yading@10: yading@10: /* iterate through each line in the height */ yading@10: for (y_ptr = 0, u_ptr = 0, v_ptr = 0; yading@10: y_ptr < (s->height * frame->linesize[0]); yading@10: y_ptr += frame->linesize[0] - s->width, yading@10: u_ptr += frame->linesize[1] - s->width / 4, yading@10: v_ptr += frame->linesize[2] - s->width / 4) { yading@10: yading@10: /* reset predictors */ yading@10: cur_byte = buf[stream_ptr++]; yading@10: u_plane[u_ptr++] = u_pred = cur_byte & 0xF0; yading@10: y_plane[y_ptr++] = y_pred = (cur_byte & 0x0F) << 4; yading@10: yading@10: cur_byte = buf[stream_ptr++]; yading@10: v_plane[v_ptr++] = v_pred = cur_byte & 0xF0; yading@10: y_pred += y_table[cur_byte & 0x0F]; yading@10: y_plane[y_ptr++] = y_pred; yading@10: yading@10: cur_byte = buf[stream_ptr++]; yading@10: y_pred += y_table[cur_byte & 0x0F]; yading@10: y_plane[y_ptr++] = y_pred; yading@10: y_pred += y_table[(cur_byte & 0xF0) >> 4]; yading@10: y_plane[y_ptr++] = y_pred; yading@10: yading@10: /* iterate through the remaining pixel groups (4 pixels/group) */ yading@10: pixel_groups = s->width / 4 - 1; yading@10: while (pixel_groups--) { yading@10: yading@10: cur_byte = buf[stream_ptr++]; yading@10: u_pred += u_table[(cur_byte & 0xF0) >> 4]; yading@10: u_plane[u_ptr++] = u_pred; yading@10: y_pred += y_table[cur_byte & 0x0F]; yading@10: y_plane[y_ptr++] = y_pred; yading@10: yading@10: cur_byte = buf[stream_ptr++]; yading@10: v_pred += v_table[(cur_byte & 0xF0) >> 4]; yading@10: v_plane[v_ptr++] = v_pred; yading@10: y_pred += y_table[cur_byte & 0x0F]; yading@10: y_plane[y_ptr++] = y_pred; yading@10: yading@10: cur_byte = buf[stream_ptr++]; yading@10: y_pred += y_table[cur_byte & 0x0F]; yading@10: y_plane[y_ptr++] = y_pred; yading@10: y_pred += y_table[(cur_byte & 0xF0) >> 4]; yading@10: y_plane[y_ptr++] = y_pred; yading@10: yading@10: } yading@10: } yading@10: } yading@10: yading@10: *got_frame = 1; yading@10: yading@10: return buf_size; yading@10: } yading@10: yading@10: #if CONFIG_AURA_DECODER yading@10: AVCodec ff_aura_decoder = { yading@10: .name = "aura", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .id = AV_CODEC_ID_AURA, yading@10: .priv_data_size = sizeof(CyuvDecodeContext), yading@10: .init = cyuv_decode_init, yading@10: .decode = cyuv_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("Auravision AURA"), yading@10: }; yading@10: #endif yading@10: yading@10: #if CONFIG_CYUV_DECODER yading@10: AVCodec ff_cyuv_decoder = { yading@10: .name = "cyuv", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .id = AV_CODEC_ID_CYUV, yading@10: .priv_data_size = sizeof(CyuvDecodeContext), yading@10: .init = cyuv_decode_init, yading@10: .decode = cyuv_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("Creative YUV (CYUV)"), yading@10: }; yading@10: #endif