ffmpeg/libavcodec/avuidec.c

   1 /*
   2  * AVID Meridien 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 avui_decode_init(AVCodecContext *avctx)
  28 {
  29     avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
  30     return 0;
  31 }
  32
  33 static int avui_decode_frame(AVCodecContext *avctx, void *data,
  34                              int *got_frame, AVPacket *avpkt)
  35 {
  36     int ret;
  37     AVFrame *pic = data;
  38     const uint8_t *src = avpkt->data, *extradata = avctx->extradata;
  39     const uint8_t *srca;
  40     uint8_t *y, *u, *v, *a;
  41     int transparent, interlaced = 1, skip, opaque_length, i, j, k;
  42     uint32_t extradata_size = avctx->extradata_size;
  43
  44     while (extradata_size >= 24) {
  45         uint32_t atom_size = AV_RB32(extradata);
  46         if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) {
  47             interlaced = extradata[19] != 1;
  48             break;
  49         }
  50         if (atom_size && atom_size <= extradata_size) {
  51             extradata      += atom_size;
  52             extradata_size -= atom_size;
  53         } else {
  54             break;
  55         }
  56     }
  57     if (avctx->height == 486) {
  58         skip = 10;
  59     } else {
  60         skip = 16;
  61     }
  62     opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced;
  63     if (avpkt->size < opaque_length) {
  64         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
  65         return AVERROR(EINVAL);
  66     }
  67     transparent = avctx->bits_per_coded_sample == 32 &&
  68                   avpkt->size >= opaque_length * 2 + 4;
  69     srca = src + opaque_length + 5;
  70
  71     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
  72         return ret;
  73
  74     pic->key_frame = 1;
  75     pic->pict_type = AV_PICTURE_TYPE_I;
  76
  77     if (!interlaced) {
  78         src  += avctx->width * skip;
  79         srca += avctx->width * skip;
  80     }
  81
  82     for (i = 0; i < interlaced + 1; i++) {
  83         src  += avctx->width * skip;
  84         srca += avctx->width * skip;
  85         if (interlaced && avctx->height == 486) {
  86             y = pic->data[0] + (1 - i) * pic->linesize[0];
  87             u = pic->data[1] + (1 - i) * pic->linesize[1];
  88             v = pic->data[2] + (1 - i) * pic->linesize[2];
  89             a = pic->data[3] + (1 - i) * pic->linesize[3];
  90         } else {
  91             y = pic->data[0] + i * pic->linesize[0];
  92             u = pic->data[1] + i * pic->linesize[1];
  93             v = pic->data[2] + i * pic->linesize[2];
  94             a = pic->data[3] + i * pic->linesize[3];
  95         }
  96
  97         for (j = 0; j < avctx->height >> interlaced; j++) {
  98             for (k = 0; k < avctx->width >> 1; k++) {
  99                 u[    k    ] = *src++;
 100                 y[2 * k    ] = *src++;
 101                 a[2 * k    ] = 0xFF - (transparent ? *srca++ : 0);
 102                 srca++;
 103                 v[    k    ] = *src++;
 104                 y[2 * k + 1] = *src++;
 105                 a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0);
 106                 srca++;
 107             }
 108
 109             y += (interlaced + 1) * pic->linesize[0];
 110             u += (interlaced + 1) * pic->linesize[1];
 111             v += (interlaced + 1) * pic->linesize[2];
 112             a += (interlaced + 1) * pic->linesize[3];
 113         }
 114         src  += 4;
 115         srca += 4;
 116     }
 117     *got_frame       = 1;
 118
 119     return avpkt->size;
 120 }
 121
 122 AVCodec ff_avui_decoder = {
 123     .name         = "avui",
 124     .long_name    = NULL_IF_CONFIG_SMALL("Avid Meridien Uncompressed"),
 125     .type         = AVMEDIA_TYPE_VIDEO,
 126     .id           = AV_CODEC_ID_AVUI,
 127     .init         = avui_decode_init,
 128     .decode       = avui_decode_frame,
 129     .capabilities = CODEC_CAP_DR1,
 130 };