LCOV - code coverage report
Current view: top level - libavcodec - m101.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 50 0.0 %
Date: 2017-12-18 20:14:19 Functions: 0 2 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2016 Michael Niedermayer
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #include "libavutil/intreadwrite.h"
      22             : 
      23             : #include "avcodec.h"
      24             : #include "internal.h"
      25             : 
      26             : 
      27           0 : static av_cold int m101_decode_init(AVCodecContext *avctx)
      28             : {
      29           0 :     if (avctx->extradata_size < 6*4) {
      30           0 :         avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size);
      31           0 :         return AVERROR_INVALIDDATA;
      32             :     }
      33             : 
      34           0 :     if (avctx->extradata[2*4] == 10)
      35           0 :         avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
      36           0 :     else if (avctx->extradata[2*4] == 8) {
      37           0 :         avctx->pix_fmt = AV_PIX_FMT_YUYV422;
      38             :     } else {
      39           0 :         avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]);
      40           0 :         return AVERROR_INVALIDDATA;
      41             :     }
      42             : 
      43           0 :     return 0;
      44             : }
      45             : 
      46           0 : static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
      47             :                       AVPacket *avpkt)
      48             : {
      49           0 :     const uint8_t *buf = avpkt->data;
      50             :     int stride, ret;
      51             :     int x, y;
      52           0 :     int min_stride = 2 * avctx->width;
      53           0 :     int bits = avctx->extradata[2*4];
      54           0 :     AVFrame *frame = data;
      55             : 
      56           0 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
      57           0 :         return ret;
      58           0 :     frame->pict_type = AV_PICTURE_TYPE_I;
      59           0 :     frame->key_frame = 1;
      60             : 
      61           0 :     stride = AV_RL32(avctx->extradata + 5*4);
      62             : 
      63           0 :     if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
      64           0 :         min_stride = (avctx->width + 15) / 16 * 20;
      65             : 
      66           0 :     if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
      67           0 :         av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
      68             :                stride, avpkt->size);
      69           0 :         return AVERROR_INVALIDDATA;
      70             :     }
      71             : 
      72           0 :     frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
      73           0 :     if (frame->interlaced_frame)
      74           0 :         frame->top_field_first = avctx->extradata[3*4] & 1;
      75             : 
      76           0 :     for (y = 0; y < avctx->height; y++) {
      77           0 :         int src_y = y;
      78           0 :         if (frame->interlaced_frame)
      79           0 :             src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2);
      80           0 :         if (bits == 8) {
      81           0 :             uint8_t *line = frame->data[0] + y*frame->linesize[0];
      82           0 :             memcpy(line, buf + src_y*stride, 2*avctx->width);
      83             :         } else {
      84             :             int block;
      85           0 :             uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
      86           0 :             uint16_t *cb   = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
      87           0 :             uint16_t *cr   = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
      88           0 :             for (block = 0; 16*block < avctx->width; block ++) {
      89           0 :                 const uint8_t *buf_src = buf + src_y*stride + 40*block;
      90           0 :                 for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
      91           0 :                     int xd = x + 16*block;
      92           0 :                     if (x&1) {
      93           0 :                         luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
      94             :                     } else {
      95           0 :                         luma [xd] = (4*buf_src[2*x + 0]) +  (buf_src[32 + (x>>1)]    &3);
      96           0 :                         cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
      97           0 :                         cr[xd>>1] = (4*buf_src[2*x + 3]) +  (buf_src[32 + (x>>1)]>>6);
      98             :                     }
      99             :                 }
     100             :             }
     101             :         }
     102             :     }
     103             : 
     104           0 :     *got_frame = 1;
     105           0 :     return avpkt->size;
     106             : }
     107             : 
     108             : AVCodec ff_m101_decoder = {
     109             :     .name           = "m101",
     110             :     .long_name      = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
     111             :     .type           = AVMEDIA_TYPE_VIDEO,
     112             :     .id             = AV_CODEC_ID_M101,
     113             :     .init           = m101_decode_init,
     114             :     .decode         = m101_decode_frame,
     115             :     .capabilities   = AV_CODEC_CAP_DR1,
     116             : };

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