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libavcodec/r210dec.c

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00001 /*
00002  * R210 decoder
00003  *
00004  * Copyright (c) 2009 Reimar Doeffinger <Reimar.Doeffinger@gmx.de>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "avcodec.h"
00024 #include "libavutil/bswap.h"
00025 
00026 static av_cold int decode_init(AVCodecContext *avctx)
00027 {
00028     avctx->pix_fmt             = PIX_FMT_RGB48;
00029     avctx->bits_per_raw_sample = 10;
00030 
00031     avctx->coded_frame         = avcodec_alloc_frame();
00032 
00033     return 0;
00034 }
00035 
00036 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00037                         AVPacket *avpkt)
00038 {
00039     int h, w;
00040     AVFrame *pic = avctx->coded_frame;
00041     const uint32_t *src = (const uint32_t *)avpkt->data;
00042     int aligned_width = FFALIGN(avctx->width, 64);
00043     uint8_t *dst_line;
00044 
00045     if (pic->data[0])
00046         avctx->release_buffer(avctx, pic);
00047 
00048     if (avpkt->size < 4 * aligned_width * avctx->height) {
00049         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
00050         return -1;
00051     }
00052 
00053     pic->reference = 0;
00054     if (avctx->get_buffer(avctx, pic) < 0)
00055         return -1;
00056 
00057     pic->pict_type = FF_I_TYPE;
00058     pic->key_frame = 1;
00059     dst_line = pic->data[0];
00060 
00061     for (h = 0; h < avctx->height; h++) {
00062         uint16_t *dst = (uint16_t *)dst_line;
00063         for (w = 0; w < avctx->width; w++) {
00064             uint32_t pixel = be2me_32(*src++);
00065             uint16_t r, g, b;
00066             b =  pixel <<  6;
00067             g = (pixel >>  4) & 0xffc0;
00068             r = (pixel >> 14) & 0xffc0;
00069             *dst++ = r | (r >> 10);
00070             *dst++ = g | (g >> 10);
00071             *dst++ = b | (b >> 10);
00072         }
00073         src += aligned_width - avctx->width;
00074         dst_line += pic->linesize[0];
00075     }
00076 
00077     *data_size = sizeof(AVFrame);
00078     *(AVFrame*)data = *avctx->coded_frame;
00079 
00080     return avpkt->size;
00081 }
00082 
00083 static av_cold int decode_close(AVCodecContext *avctx)
00084 {
00085     AVFrame *pic = avctx->coded_frame;
00086     if (pic->data[0])
00087         avctx->release_buffer(avctx, pic);
00088     av_freep(&avctx->coded_frame);
00089 
00090     return 0;
00091 }
00092 
00093 AVCodec r210_decoder = {
00094     "r210",
00095     AVMEDIA_TYPE_VIDEO,
00096     CODEC_ID_R210,
00097     0,
00098     decode_init,
00099     NULL,
00100     decode_close,
00101     decode_frame,
00102     CODEC_CAP_DR1,
00103     .long_name = NULL_IF_CONFIG_SMALL("Uncompressed RGB 10-bit"),
00104 };

Generated on Fri Sep 16 2011 17:17:42 for FFmpeg by  doxygen 1.7.1