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Member "ffmpeg-3.4.2/libavcodec/012v.c" (31 Dec 2017, 4847 Bytes) of package /linux/misc/ffmpeg-3.4.2.tar.xz:


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    1 /*
    2  * 012v decoder
    3  *
    4  * Copyright (C) 2012 Carl Eugen Hoyos
    5  *
    6  * This file is part of FFmpeg.
    7  *
    8  * FFmpeg is free software; you can redistribute it and/or
    9  * modify it under the terms of the GNU Lesser General Public
   10  * License as published by the Free Software Foundation; either
   11  * version 2.1 of the License, or (at your option) any later version.
   12  *
   13  * FFmpeg is distributed in the hope that it will be useful,
   14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   16  * Lesser General Public License for more details.
   17  *
   18  * You should have received a copy of the GNU Lesser General Public
   19  * License along with FFmpeg; if not, write to the Free Software
   20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   21  */
   22 
   23 #include "avcodec.h"
   24 #include "internal.h"
   25 #include "libavutil/intreadwrite.h"
   26 
   27 static av_cold int zero12v_decode_init(AVCodecContext *avctx)
   28 {
   29     avctx->pix_fmt             = AV_PIX_FMT_YUV422P16;
   30     avctx->bits_per_raw_sample = 10;
   31 
   32     if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
   33         avpriv_request_sample(avctx, "transparency");
   34 
   35     return 0;
   36 }
   37 
   38 static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
   39                                 int *got_frame, AVPacket *avpkt)
   40 {
   41     int line, ret;
   42     const int width = avctx->width;
   43     AVFrame *pic = data;
   44     uint16_t *y, *u, *v;
   45     const uint8_t *line_end, *src = avpkt->data;
   46     int stride = avctx->width * 8 / 3;
   47 
   48     if (width <= 1 || avctx->height <= 0) {
   49         av_log(avctx, AV_LOG_ERROR, "Dimensions %dx%d not supported.\n", width, avctx->height);
   50         return AVERROR_INVALIDDATA;
   51     }
   52 
   53     if (   avctx->codec_tag == MKTAG('0', '1', '2', 'v')
   54         && avpkt->size % avctx->height == 0
   55         && avpkt->size / avctx->height * 3 >= width * 8)
   56         stride = avpkt->size / avctx->height;
   57 
   58     if (avpkt->size < avctx->height * stride) {
   59         av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
   60                avpkt->size, avctx->height * stride);
   61         return AVERROR_INVALIDDATA;
   62     }
   63 
   64     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
   65         return ret;
   66 
   67     pic->pict_type = AV_PICTURE_TYPE_I;
   68     pic->key_frame = 1;
   69 
   70     line_end = avpkt->data + stride;
   71     for (line = 0; line < avctx->height; line++) {
   72         uint16_t y_temp[6] = {0x8000, 0x8000, 0x8000, 0x8000, 0x8000, 0x8000};
   73         uint16_t u_temp[3] = {0x8000, 0x8000, 0x8000};
   74         uint16_t v_temp[3] = {0x8000, 0x8000, 0x8000};
   75         int x;
   76         y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
   77         u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
   78         v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
   79 
   80         for (x = 0; x < width; x += 6) {
   81             uint32_t t;
   82 
   83             if (width - x < 6 || line_end - src < 16) {
   84                 y = y_temp;
   85                 u = u_temp;
   86                 v = v_temp;
   87             }
   88 
   89             if (line_end - src < 4)
   90                 break;
   91 
   92             t = AV_RL32(src);
   93             src += 4;
   94             *u++ = t <<  6 & 0xFFC0;
   95             *y++ = t >>  4 & 0xFFC0;
   96             *v++ = t >> 14 & 0xFFC0;
   97 
   98             if (line_end - src < 4)
   99                 break;
  100 
  101             t = AV_RL32(src);
  102             src += 4;
  103             *y++ = t <<  6 & 0xFFC0;
  104             *u++ = t >>  4 & 0xFFC0;
  105             *y++ = t >> 14 & 0xFFC0;
  106 
  107             if (line_end - src < 4)
  108                 break;
  109 
  110             t = AV_RL32(src);
  111             src += 4;
  112             *v++ = t <<  6 & 0xFFC0;
  113             *y++ = t >>  4 & 0xFFC0;
  114             *u++ = t >> 14 & 0xFFC0;
  115 
  116             if (line_end - src < 4)
  117                 break;
  118 
  119             t = AV_RL32(src);
  120             src += 4;
  121             *y++ = t <<  6 & 0xFFC0;
  122             *v++ = t >>  4 & 0xFFC0;
  123             *y++ = t >> 14 & 0xFFC0;
  124 
  125             if (width - x < 6)
  126                 break;
  127         }
  128 
  129         if (x < width) {
  130             y = x   + (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
  131             u = x/2 + (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
  132             v = x/2 + (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
  133             memcpy(y, y_temp, sizeof(*y) * (width - x));
  134             memcpy(u, u_temp, sizeof(*u) * (width - x + 1) / 2);
  135             memcpy(v, v_temp, sizeof(*v) * (width - x + 1) / 2);
  136         }
  137 
  138         line_end += stride;
  139         src = line_end - stride;
  140     }
  141 
  142     *got_frame = 1;
  143 
  144     return avpkt->size;
  145 }
  146 
  147 AVCodec ff_zero12v_decoder = {
  148     .name           = "012v",
  149     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
  150     .type           = AVMEDIA_TYPE_VIDEO,
  151     .id             = AV_CODEC_ID_012V,
  152     .init           = zero12v_decode_init,
  153     .decode         = zero12v_decode_frame,
  154     .capabilities   = AV_CODEC_CAP_DR1,
  155 };