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  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. };
  131.