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  1. /*
  2.  * Copyright (c) 2011 Derek Buitenhuis
  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 General Public
  8.  * License as published by the Free Software Foundation;
  9.  * version 2 of the License.
  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.  * General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU 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. /**
  22.  * @file
  23.  * Known FOURCCs:
  24.  *     'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA),
  25.  *     'ULH0' (YCbCr 4:2:0 BT.709), 'ULH2' (YCbCr 4:2:2 BT.709)
  26.  */
  27.  
  28. extern "C" {
  29. #include "avcodec.h"
  30. }
  31.  
  32. #include "libutvideo.h"
  33. #include "get_bits.h"
  34.  
  35. static av_cold int utvideo_decode_init(AVCodecContext *avctx)
  36. {
  37.     UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
  38.     UtVideoExtra info;
  39.     int format;
  40.     int begin_ret;
  41.  
  42.     if (avctx->extradata_size != 4*4) {
  43.         av_log(avctx, AV_LOG_ERROR, "Extradata size mismatch.\n");
  44.         return -1;
  45.     }
  46.  
  47.     /* Read extradata */
  48.     info.version = AV_RL32(avctx->extradata);
  49.     info.original_format = AV_RL32(avctx->extradata + 4);
  50.     info.frameinfo_size = AV_RL32(avctx->extradata + 8);
  51.     info.flags = AV_RL32(avctx->extradata + 12);
  52.  
  53.     /* Pick format based on FOURCC */
  54.     switch (avctx->codec_tag) {
  55. #ifdef UTV_BT709
  56.     case MKTAG('U', 'L', 'H', '0'):
  57.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  58.         avctx->colorspace = AVCOL_SPC_BT709;
  59.         format = UTVF_YV12;
  60.         break;
  61.     case MKTAG('U', 'L', 'H', '2'):
  62.         avctx->pix_fmt = AV_PIX_FMT_YUYV422;
  63.         avctx->colorspace = AVCOL_SPC_BT709;
  64.         format = UTVF_YUY2;
  65.         break;
  66. #endif
  67.     case MKTAG('U', 'L', 'Y', '0'):
  68.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  69.         format = UTVF_YV12;
  70.         break;
  71.     case MKTAG('U', 'L', 'Y', '2'):
  72.         avctx->pix_fmt = AV_PIX_FMT_YUYV422;
  73.         format = UTVF_YUY2;
  74.         break;
  75.     case MKTAG('U', 'L', 'R', 'G'):
  76.         avctx->pix_fmt = AV_PIX_FMT_BGR24;
  77.         format = UTVF_NFCC_BGR_BU;
  78.         break;
  79.     case MKTAG('U', 'L', 'R', 'A'):
  80.         avctx->pix_fmt = AV_PIX_FMT_RGB32;
  81.         format = UTVF_NFCC_BGRA_BU;
  82.         break;
  83.     default:
  84.         av_log(avctx, AV_LOG_ERROR,
  85.               "Not a Ut Video FOURCC: %X\n", avctx->codec_tag);
  86.         return -1;
  87.     }
  88.  
  89.     /* Only allocate the buffer once */
  90.     utv->buf_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
  91.     utv->buffer = (uint8_t *)av_malloc(utv->buf_size * sizeof(uint8_t));
  92.  
  93.     if (utv->buffer == NULL) {
  94.         av_log(avctx, AV_LOG_ERROR, "Unable to allocate output buffer.\n");
  95.         return -1;
  96.     }
  97.  
  98.     /* Allocate the output frame */
  99.     avctx->coded_frame = avcodec_alloc_frame();
  100.  
  101.     /* Ut Video only supports 8-bit */
  102.     avctx->bits_per_raw_sample = 8;
  103.  
  104.     /* Is it interlaced? */
  105.     avctx->coded_frame->interlaced_frame = info.flags & 0x800 ? 1 : 0;
  106.  
  107.     /* Apparently Ut Video doesn't store this info... */
  108.     avctx->coded_frame->top_field_first = 1;
  109.  
  110.     /*
  111.      * Create a Ut Video instance. Since the function wants
  112.      * an "interface name" string, pass it the name of the lib.
  113.      */
  114.     utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");
  115.  
  116.     /* Initialize Decoding */
  117.     begin_ret = utv->codec->DecodeBegin(format, avctx->width, avctx->height,
  118.                             CBGROSSWIDTH_WINDOWS, &info, sizeof(UtVideoExtra));
  119.  
  120.     /* Check to see if the decoder initlized properly */
  121.     if (begin_ret != 0) {
  122.         av_log(avctx, AV_LOG_ERROR,
  123.                "Could not initialize decoder: %d\n", begin_ret);
  124.         return -1;
  125.     }
  126.  
  127.     return 0;
  128. }
  129.  
  130. static int utvideo_decode_frame(AVCodecContext *avctx, void *data,
  131.                                 int *got_frame, AVPacket *avpkt)
  132. {
  133.     UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
  134.     AVFrame *pic = avctx->coded_frame;
  135.     int w = avctx->width, h = avctx->height;
  136.  
  137.     /* Set flags */
  138.     pic->reference = 0;
  139.     pic->pict_type = AV_PICTURE_TYPE_I;
  140.     pic->key_frame = 1;
  141.  
  142.     /* Decode the frame */
  143.     utv->codec->DecodeFrame(utv->buffer, avpkt->data, true);
  144.  
  145.     /* Set the output data depending on the colorspace */
  146.     switch (avctx->pix_fmt) {
  147.     case AV_PIX_FMT_YUV420P:
  148.         pic->linesize[0] = w;
  149.         pic->linesize[1] = pic->linesize[2] = w / 2;
  150.         pic->data[0] = utv->buffer;
  151.         pic->data[2] = utv->buffer + (w * h);
  152.         pic->data[1] = pic->data[2] + (w * h / 4);
  153.         break;
  154.     case AV_PIX_FMT_YUYV422:
  155.         pic->linesize[0] = w * 2;
  156.         pic->data[0] = utv->buffer;
  157.         break;
  158.     case AV_PIX_FMT_BGR24:
  159.     case AV_PIX_FMT_RGB32:
  160.         /* Make the linesize negative, since Ut Video uses bottom-up BGR */
  161.         pic->linesize[0] = -1 * w * (avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4);
  162.         pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0];
  163.         break;
  164.     }
  165.  
  166.     *got_frame = 1;
  167.     *(AVFrame *)data = *pic;
  168.  
  169.     return avpkt->size;
  170. }
  171.  
  172. static av_cold int utvideo_decode_close(AVCodecContext *avctx)
  173. {
  174.     UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
  175.  
  176.     /* Free output */
  177.     av_freep(&avctx->coded_frame);
  178.     av_freep(&utv->buffer);
  179.  
  180.     /* Finish decoding and clean up the instance */
  181.     utv->codec->DecodeEnd();
  182.     CCodec::DeleteInstance(utv->codec);
  183.  
  184.     return 0;
  185. }
  186.  
  187. AVCodec ff_libutvideo_decoder = {
  188.     "libutvideo",
  189.     NULL_IF_CONFIG_SMALL("Ut Video"),
  190.     AVMEDIA_TYPE_VIDEO,
  191.     AV_CODEC_ID_UTVIDEO,
  192.     0,    //capabilities
  193.     NULL, //supported_framerates
  194.     NULL, //pix_fmts
  195.     NULL, //supported_samplerates
  196.     NULL, //sample_fmts
  197.     NULL, //channel_layouts
  198.     0,    //max_lowres
  199.     NULL, //priv_class
  200.     NULL, //profiles
  201.     sizeof(UtVideoContext),
  202.     NULL, //next
  203.     NULL, //init_thread_copy
  204.     NULL, //update_thread_context
  205.     NULL, //defaults
  206.     NULL, //init_static_data
  207.     utvideo_decode_init,
  208.     NULL, //encode
  209.     NULL, //encode2
  210.     utvideo_decode_frame,
  211.     utvideo_decode_close,
  212. };
  213.