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libavcodec/yuv4enc.c

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00001 /*
00002  * libquicktime yuv4 encoder
00003  *
00004  * Copyright (c) 2011 Carl Eugen Hoyos
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 
00025 static av_cold int yuv4_encode_init(AVCodecContext *avctx)
00026 {
00027     avctx->coded_frame = avcodec_alloc_frame();
00028 
00029     if (!avctx->coded_frame) {
00030         av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
00031         return AVERROR(ENOMEM);
00032     }
00033 
00034     return 0;
00035 }
00036 
00037 static int yuv4_encode_frame(AVCodecContext *avctx, uint8_t *buf,
00038                              int buf_size, void *data)
00039 {
00040     AVFrame *pic = data;
00041     uint8_t *dst = buf;
00042     uint8_t *y, *u, *v;
00043     int i, j;
00044     int output_size = 0;
00045 
00046     if (buf_size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
00047         av_log(avctx, AV_LOG_ERROR, "Out buffer is too small.\n");
00048         return AVERROR(ENOMEM);
00049     }
00050 
00051     avctx->coded_frame->reference = 0;
00052     avctx->coded_frame->key_frame = 1;
00053     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
00054 
00055     y = pic->data[0];
00056     u = pic->data[1];
00057     v = pic->data[2];
00058 
00059     for (i = 0; i < avctx->height + 1 >> 1; i++) {
00060         for (j = 0; j < avctx->width + 1 >> 1; j++) {
00061             *dst++ = u[j] ^ 0x80;
00062             *dst++ = v[j] ^ 0x80;
00063             *dst++ = y[                   2 * j    ];
00064             *dst++ = y[                   2 * j + 1];
00065             *dst++ = y[pic->linesize[0] + 2 * j    ];
00066             *dst++ = y[pic->linesize[0] + 2 * j + 1];
00067             output_size += 6;
00068         }
00069         y += 2 * pic->linesize[0];
00070         u +=     pic->linesize[1];
00071         v +=     pic->linesize[2];
00072     }
00073 
00074     return output_size;
00075 }
00076 
00077 static av_cold int yuv4_encode_close(AVCodecContext *avctx)
00078 {
00079     av_freep(&avctx->coded_frame);
00080 
00081     return 0;
00082 }
00083 
00084 AVCodec ff_yuv4_encoder = {
00085     .name         = "yuv4",
00086     .type         = AVMEDIA_TYPE_VIDEO,
00087     .id           = CODEC_ID_YUV4,
00088     .init         = yuv4_encode_init,
00089     .encode       = yuv4_encode_frame,
00090     .close        = yuv4_encode_close,
00091     .pix_fmts     = (const enum PixelFormat[]){ PIX_FMT_YUV420P, PIX_FMT_NONE },
00092     .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
00093 };
Generated on Fri Feb 1 2013 14:34:47 for FFmpeg by doxygen 1.7.1