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Member "ffmpeg-3.4.2/libavformat/a64.c" (31 Dec 2017, 2069 Bytes) of package /linux/misc/ffmpeg-3.4.2.tar.xz:


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    1 /*
    2  * a64 muxer
    3  * Copyright (c) 2009 Tobias Bindhammer
    4  *
    5  * This file is part of FFmpeg.
    6  *
    7  * FFmpeg is free software; you can redistribute it and/or
    8  * modify it under the terms of the GNU Lesser General Public
    9  * License as published by the Free Software Foundation; either
   10  * version 2.1 of the License, or (at your option) any later version.
   11  *
   12  * FFmpeg is distributed in the hope that it will be useful,
   13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   15  * Lesser General Public License for more details.
   16  *
   17  * You should have received a copy of the GNU Lesser General Public
   18  * License along with FFmpeg; if not, write to the Free Software
   19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   20  */
   21 
   22 #include "libavcodec/avcodec.h"
   23 #include "libavcodec/bytestream.h"
   24 #include "avformat.h"
   25 #include "rawenc.h"
   26 
   27 static int a64_write_header(AVFormatContext *s)
   28 {
   29     AVCodecParameters *par = s->streams[0]->codecpar;
   30     uint8_t header[5] = {
   31         0x00, //load
   32         0x40, //address
   33         0x00, //mode
   34         0x00, //charset_lifetime (multi only)
   35         0x00  //fps in 50/fps;
   36     };
   37 
   38     if (par->extradata_size < 4) {
   39         av_log(s, AV_LOG_ERROR, "Missing extradata\n");
   40         return AVERROR_INVALIDDATA;
   41     }
   42 
   43     switch (par->codec_id) {
   44     case AV_CODEC_ID_A64_MULTI:
   45         header[2] = 0x00;
   46         header[3] = AV_RB32(par->extradata+0);
   47         header[4] = 2;
   48         break;
   49     case AV_CODEC_ID_A64_MULTI5:
   50         header[2] = 0x01;
   51         header[3] = AV_RB32(par->extradata+0);
   52         header[4] = 3;
   53         break;
   54     default:
   55         return AVERROR_INVALIDDATA;
   56     }
   57     avio_write(s->pb, header, 2);
   58     return 0;
   59 }
   60 
   61 AVOutputFormat ff_a64_muxer = {
   62     .name           = "a64",
   63     .long_name      = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
   64     .extensions     = "a64, A64",
   65     .video_codec    = AV_CODEC_ID_A64_MULTI,
   66     .write_header   = a64_write_header,
   67     .write_packet   = ff_raw_write_packet,
   68 };