LCOV - code coverage report
Current view: top level - libavcodec - cyuv.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 67 75 89.3 %
Date: 2017-12-13 02:34:56 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Creative YUV (CYUV) Video Decoder
       3             :  *   by Mike Melanson (melanson@pcisys.net)
       4             :  * based on "Creative YUV (CYUV) stream format for AVI":
       5             :  *   http://www.csse.monash.edu.au/~timf/videocodec/cyuv.txt
       6             :  *
       7             :  * Copyright (C) 2003 The FFmpeg project
       8             :  *
       9             :  * This file is part of FFmpeg.
      10             :  *
      11             :  * FFmpeg is free software; you can redistribute it and/or
      12             :  * modify it under the terms of the GNU Lesser General Public
      13             :  * License as published by the Free Software Foundation; either
      14             :  * version 2.1 of the License, or (at your option) any later version.
      15             :  *
      16             :  * FFmpeg is distributed in the hope that it will be useful,
      17             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      18             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      19             :  * Lesser General Public License for more details.
      20             :  *
      21             :  * You should have received a copy of the GNU Lesser General Public
      22             :  * License along with FFmpeg; if not, write to the Free Software
      23             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      24             :  */
      25             : 
      26             : /**
      27             :  * @file
      28             :  * Creative YUV (CYUV) Video Decoder.
      29             :  */
      30             : 
      31             : #include <stdio.h>
      32             : #include <stdlib.h>
      33             : #include <string.h>
      34             : 
      35             : #include "avcodec.h"
      36             : #include "internal.h"
      37             : #include "libavutil/internal.h"
      38             : 
      39             : 
      40             : typedef struct CyuvDecodeContext {
      41             :     AVCodecContext *avctx;
      42             :     int width, height;
      43             : } CyuvDecodeContext;
      44             : 
      45           4 : static av_cold int cyuv_decode_init(AVCodecContext *avctx)
      46             : {
      47           4 :     CyuvDecodeContext *s = avctx->priv_data;
      48             : 
      49           4 :     s->avctx = avctx;
      50           4 :     s->width = avctx->width;
      51             :     /* width needs to be divisible by 4 for this codec to work */
      52           4 :     if (s->width & 0x3)
      53           0 :         return AVERROR_INVALIDDATA;
      54           4 :     s->height = avctx->height;
      55             : 
      56           4 :     return 0;
      57             : }
      58             : 
      59         177 : static int cyuv_decode_frame(AVCodecContext *avctx,
      60             :                              void *data, int *got_frame,
      61             :                              AVPacket *avpkt)
      62             : {
      63         177 :     const uint8_t *buf = avpkt->data;
      64         177 :     int buf_size = avpkt->size;
      65         177 :     CyuvDecodeContext *s=avctx->priv_data;
      66         177 :     AVFrame *frame = data;
      67             : 
      68             :     unsigned char *y_plane;
      69             :     unsigned char *u_plane;
      70             :     unsigned char *v_plane;
      71             :     int y_ptr;
      72             :     int u_ptr;
      73             :     int v_ptr;
      74             : 
      75             :     /* prediction error tables (make it clear that they are signed values) */
      76         177 :     const signed char *y_table = (const signed char*)buf +  0;
      77         177 :     const signed char *u_table = (const signed char*)buf + 16;
      78         177 :     const signed char *v_table = (const signed char*)buf + 32;
      79             : 
      80             :     unsigned char y_pred, u_pred, v_pred;
      81             :     int stream_ptr;
      82             :     unsigned char cur_byte;
      83             :     int pixel_groups;
      84         177 :     int rawsize = s->height * FFALIGN(s->width,2) * 2;
      85             :     int ret;
      86             : 
      87         177 :     if (avctx->codec_id == AV_CODEC_ID_AURA) {
      88          26 :         y_table = u_table;
      89          26 :         u_table = v_table;
      90             :     }
      91             :     /* sanity check the buffer size: A buffer has 3x16-bytes tables
      92             :      * followed by (height) lines each with 3 bytes to represent groups
      93             :      * of 4 pixels. Thus, the total size of the buffer ought to be:
      94             :      *    (3 * 16) + height * (width * 3 / 4) */
      95         177 :     if (buf_size == 48 + s->height * (s->width * 3 / 4)) {
      96         176 :         avctx->pix_fmt = AV_PIX_FMT_YUV411P;
      97           1 :     } else if(buf_size == rawsize ) {
      98           0 :         avctx->pix_fmt = AV_PIX_FMT_UYVY422;
      99             :     } else {
     100           1 :         av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n",
     101           1 :                buf_size, 48 + s->height * (s->width * 3 / 4));
     102           1 :         return AVERROR_INVALIDDATA;
     103             :     }
     104             : 
     105             :     /* pixel data starts 48 bytes in, after 3x16-byte tables */
     106         176 :     stream_ptr = 48;
     107             : 
     108         176 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
     109           0 :         return ret;
     110             : 
     111         176 :     y_plane = frame->data[0];
     112         176 :     u_plane = frame->data[1];
     113         176 :     v_plane = frame->data[2];
     114             : 
     115         176 :     if (buf_size == rawsize) {
     116           0 :         int linesize = FFALIGN(s->width,2) * 2;
     117           0 :         y_plane += frame->linesize[0] * s->height;
     118           0 :         for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) {
     119           0 :             y_plane -= frame->linesize[0];
     120           0 :             memcpy(y_plane, buf+stream_ptr, linesize);
     121             :         }
     122             :     } else {
     123             : 
     124             :     /* iterate through each line in the height */
     125       25096 :     for (y_ptr = 0, u_ptr = 0, v_ptr = 0;
     126       24920 :          y_ptr < (s->height * frame->linesize[0]);
     127       24744 :          y_ptr += frame->linesize[0] - s->width,
     128       24744 :          u_ptr += frame->linesize[1] - s->width / 4,
     129       24744 :          v_ptr += frame->linesize[2] - s->width / 4) {
     130             : 
     131             :         /* reset predictors */
     132       24744 :         cur_byte = buf[stream_ptr++];
     133       24744 :         u_plane[u_ptr++] = u_pred = cur_byte & 0xF0;
     134       24744 :         y_plane[y_ptr++] = y_pred = (cur_byte & 0x0F) << 4;
     135             : 
     136       24744 :         cur_byte = buf[stream_ptr++];
     137       24744 :         v_plane[v_ptr++] = v_pred = cur_byte & 0xF0;
     138       24744 :         y_pred += y_table[cur_byte & 0x0F];
     139       24744 :         y_plane[y_ptr++] = y_pred;
     140             : 
     141       24744 :         cur_byte = buf[stream_ptr++];
     142       24744 :         y_pred += y_table[cur_byte & 0x0F];
     143       24744 :         y_plane[y_ptr++] = y_pred;
     144       24744 :         y_pred += y_table[(cur_byte & 0xF0) >> 4];
     145       24744 :         y_plane[y_ptr++] = y_pred;
     146             : 
     147             :         /* iterate through the remaining pixel groups (4 pixels/group) */
     148       24744 :         pixel_groups = s->width / 4 - 1;
     149     1101480 :         while (pixel_groups--) {
     150             : 
     151     1051992 :             cur_byte = buf[stream_ptr++];
     152     1051992 :             u_pred += u_table[(cur_byte & 0xF0) >> 4];
     153     1051992 :             u_plane[u_ptr++] = u_pred;
     154     1051992 :             y_pred += y_table[cur_byte & 0x0F];
     155     1051992 :             y_plane[y_ptr++] = y_pred;
     156             : 
     157     1051992 :             cur_byte = buf[stream_ptr++];
     158     1051992 :             v_pred += v_table[(cur_byte & 0xF0) >> 4];
     159     1051992 :             v_plane[v_ptr++] = v_pred;
     160     1051992 :             y_pred += y_table[cur_byte & 0x0F];
     161     1051992 :             y_plane[y_ptr++] = y_pred;
     162             : 
     163     1051992 :             cur_byte = buf[stream_ptr++];
     164     1051992 :             y_pred += y_table[cur_byte & 0x0F];
     165     1051992 :             y_plane[y_ptr++] = y_pred;
     166     1051992 :             y_pred += y_table[(cur_byte & 0xF0) >> 4];
     167     1051992 :             y_plane[y_ptr++] = y_pred;
     168             : 
     169             :         }
     170             :     }
     171             :     }
     172             : 
     173         176 :     *got_frame = 1;
     174             : 
     175         176 :     return buf_size;
     176             : }
     177             : 
     178             : #if CONFIG_AURA_DECODER
     179             : AVCodec ff_aura_decoder = {
     180             :     .name           = "aura",
     181             :     .long_name      = NULL_IF_CONFIG_SMALL("Auravision AURA"),
     182             :     .type           = AVMEDIA_TYPE_VIDEO,
     183             :     .id             = AV_CODEC_ID_AURA,
     184             :     .priv_data_size = sizeof(CyuvDecodeContext),
     185             :     .init           = cyuv_decode_init,
     186             :     .decode         = cyuv_decode_frame,
     187             :     .capabilities   = AV_CODEC_CAP_DR1,
     188             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
     189             : };
     190             : #endif
     191             : 
     192             : #if CONFIG_CYUV_DECODER
     193             : AVCodec ff_cyuv_decoder = {
     194             :     .name           = "cyuv",
     195             :     .long_name      = NULL_IF_CONFIG_SMALL("Creative YUV (CYUV)"),
     196             :     .type           = AVMEDIA_TYPE_VIDEO,
     197             :     .id             = AV_CODEC_ID_CYUV,
     198             :     .priv_data_size = sizeof(CyuvDecodeContext),
     199             :     .init           = cyuv_decode_init,
     200             :     .decode         = cyuv_decode_frame,
     201             :     .capabilities   = AV_CODEC_CAP_DR1,
     202             :     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
     203             : };
     204             : #endif

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