| /* |
| * 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", |
| .long_name = NULL_IF_CONFIG_SMALL("Auravision AURA"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_AURA, |
| .priv_data_size = sizeof(CyuvDecodeContext), |
| .init = cyuv_decode_init, |
| .decode = cyuv_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
| }; |
| #endif |
| |
| #if CONFIG_CYUV_DECODER |
| AVCodec ff_cyuv_decoder = { |
| .name = "cyuv", |
| .long_name = NULL_IF_CONFIG_SMALL("Creative YUV (CYUV)"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_CYUV, |
| .priv_data_size = sizeof(CyuvDecodeContext), |
| .init = cyuv_decode_init, |
| .decode = cyuv_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
| }; |
| #endif |