libavcodec/v410dec.c

   1 /*
   2  * v410 decoder
   3  *
   4  * Copyright (c) 2011 Derek Buitenhuis
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "libavutil/common.h"
  24 #include "libavutil/intreadwrite.h"
  25 #include "avcodec.h"
  26 #include "internal.h"
  27
  28 static av_cold int v410_decode_init(AVCodecContext *avctx)
  29 {
  30     avctx->pix_fmt             = AV_PIX_FMT_YUV444P10;
  31     avctx->bits_per_raw_sample = 10;
  32
  33     if (avctx->width & 1) {
  34         if (avctx->err_recognition & AV_EF_EXPLODE) {
  35             av_log(avctx, AV_LOG_ERROR, "v410 requires width to be even.\n");
  36             return AVERROR_INVALIDDATA;
  37         } else {
  38             av_log(avctx, AV_LOG_WARNING, "v410 requires width to be even, continuing anyway.\n");
  39         }
  40     }
  41
  42     avctx->coded_frame = avcodec_alloc_frame();
  43
  44     if (!avctx->coded_frame) {
  45         av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
  46         return AVERROR(ENOMEM);
  47     }
  48
  49     return 0;
  50 }
  51
  52 static int v410_decode_frame(AVCodecContext *avctx, void *data,
  53                              int *got_frame, AVPacket *avpkt)
  54 {
  55     AVFrame *pic = avctx->coded_frame;
  56     uint8_t *src = avpkt->data;
  57     uint16_t *y, *u, *v;
  58     uint32_t val;
  59     int i, j;
  60
  61     if (pic->data[0])
  62         avctx->release_buffer(avctx, pic);
  63
  64     if (avpkt->size < 4 * avctx->height * avctx->width) {
  65         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
  66         return AVERROR(EINVAL);
  67     }
  68
  69     pic->reference = 0;
  70
  71     if (ff_get_buffer(avctx, pic) < 0) {
  72         av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
  73         return AVERROR(ENOMEM);
  74     }
  75
  76     pic->key_frame = 1;
  77     pic->pict_type = AV_PICTURE_TYPE_I;
  78
  79     y = (uint16_t *)pic->data[0];
  80     u = (uint16_t *)pic->data[1];
  81     v = (uint16_t *)pic->data[2];
  82
  83     for (i = 0; i < avctx->height; i++) {
  84         for (j = 0; j < avctx->width; j++) {
  85             val = AV_RL32(src);
  86
  87             u[j] = (val >>  2) & 0x3FF;
  88             y[j] = (val >> 12) & 0x3FF;
  89             v[j] = (val >> 22);
  90
  91             src += 4;
  92         }
  93
  94         y += pic->linesize[0] >> 1;
  95         u += pic->linesize[1] >> 1;
  96         v += pic->linesize[2] >> 1;
  97     }
  98
  99     *got_frame = 1;
 100     *(AVFrame *)data = *pic;
 101
 102     return avpkt->size;
 103 }
 104
 105 static av_cold int v410_decode_close(AVCodecContext *avctx)
 106 {
 107     if (avctx->coded_frame->data[0])
 108         avctx->release_buffer(avctx, avctx->coded_frame);
 109
 110     av_freep(&avctx->coded_frame);
 111
 112     return 0;
 113 }
 114
 115 AVCodec ff_v410_decoder = {
 116     .name         = "v410",
 117     .type         = AVMEDIA_TYPE_VIDEO,
 118     .id           = AV_CODEC_ID_V410,
 119     .init         = v410_decode_init,
 120     .decode       = v410_decode_frame,
 121     .close        = v410_decode_close,
 122     .capabilities = CODEC_CAP_DR1,
 123     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed 4:4:4 10-bit"),
 124 };