libvo/vo_png.c

   1 /*
   2  * Portable Network Graphics renderer
   3  *
   4  * Copyright 2001 by Felix Buenemann <atmosfear@users.sourceforge.net>
   5  *
   6  * Uses libpng (which uses zlib), so see according licenses.
   7  *
   8  * This file is part of MPlayer.
   9  *
  10  * MPlayer is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * MPlayer is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <errno.h>
  29
  30 #include <libavcodec/avcodec.h>
  31 #include <libavutil/common.h>
  32
  33 #include "config.h"
  34 #include "mp_msg.h"
  35 #include "mp_msg.h"
  36 #include "video_out.h"
  37 #include "video_out_internal.h"
  38 #include "subopt-helper.h"
  39 #include "fmt-conversion.h"
  40
  41 static const vo_info_t info =
  42 {
  43         "PNG file",
  44         "png",
  45         "Felix Buenemann <atmosfear@users.sourceforge.net>",
  46         ""
  47 };
  48
  49 const LIBVO_EXTERN (png)
  50
  51 static int z_compression;
  52 static int framenum;
  53 static int use_alpha;
  54 static AVCodecContext *avctx;
  55 static uint8_t *outbuffer;
  56 int outbuffer_size;
  57
  58 static int
  59 config(uint32_t width, uint32_t height, uint32_t d_width, uint32_t d_height, uint32_t flags, char *title, uint32_t format)
  60 {
  61             if(z_compression == 0) {
  62                     mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_PNG] Warning: compression level set to 0, compression disabled!\n");
  63                     mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_PNG] Info: Use -vo png:z=<n> to set compression level from 0 to 9.\n");
  64                     mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_PNG] Info: (0 = no compression, 1 = fastest, lowest - 9 best, slowest compression)\n");
  65             }
  66
  67     mp_msg(MSGT_VO,MSGL_DBG2, "PNG Compression level %i\n", z_compression);
  68     uninit();
  69     struct AVCodec *png_codec = avcodec_find_encoder(CODEC_ID_PNG);
  70     if (!png_codec)
  71         goto error;
  72     avctx = avcodec_alloc_context3(png_codec);
  73     if (!avctx)
  74         goto error;
  75     avctx->width = width;
  76     avctx->height = height;
  77     avctx->pix_fmt = imgfmt2pixfmt(format);
  78     avctx->compression_level = z_compression;
  79     if (avcodec_open2(avctx, png_codec, NULL) < 0)
  80         goto error;
  81     return 0;
  82
  83  error:
  84     uninit();
  85     return -1;
  86 }
  87
  88
  89 static uint32_t draw_image(mp_image_t* mpi){
  90     AVFrame pic;
  91     int buffersize;
  92     int res;
  93     char buf[100];
  94     FILE *outfile;
  95
  96     // if -dr or -slices then do nothing:
  97     if(mpi->flags&(MP_IMGFLAG_DIRECT|MP_IMGFLAG_DRAW_CALLBACK)) return VO_TRUE;
  98
  99     snprintf (buf, 100, "%08d.png", ++framenum);
 100     outfile = fopen(buf, "wb");
 101     if (!outfile) {
 102         mp_msg(MSGT_VO,MSGL_WARN, "\n[VO_PNG] Error opening '%s' for writing!\n", strerror(errno));
 103         return 1;
 104     }
 105
 106     pic.data[0] = mpi->planes[0];
 107     pic.linesize[0] = mpi->stride[0];
 108     buffersize = mpi->w * mpi->h * 8;
 109     if (outbuffer_size < buffersize) {
 110         av_freep(&outbuffer);
 111         outbuffer = av_malloc(buffersize);
 112         outbuffer_size = buffersize;
 113     }
 114     res = avcodec_encode_video(avctx, outbuffer, outbuffer_size, &pic);
 115
 116     if(res < 0){
 117             mp_msg(MSGT_VO,MSGL_WARN, "[VO_PNG] Error in create_png.\n");
 118             fclose(outfile);
 119             return 1;
 120     }
 121
 122     fwrite(outbuffer, res, 1, outfile);
 123     fclose(outfile);
 124
 125     return VO_TRUE;
 126 }
 127
 128 static void draw_osd(void){}
 129
 130 static void flip_page (void){}
 131
 132 static int draw_frame(uint8_t * src[])
 133 {
 134     return -1;
 135 }
 136
 137 static int draw_slice( uint8_t *src[],int stride[],int w,int h,int x,int y )
 138 {
 139     return -1;
 140 }
 141
 142 static int
 143 query_format(uint32_t format)
 144 {
 145     const int supported_flags = VFCAP_CSP_SUPPORTED|VFCAP_CSP_SUPPORTED_BY_HW|VFCAP_ACCEPT_STRIDE;
 146     switch(format){
 147     case IMGFMT_RGB24:
 148         return use_alpha ? 0 : supported_flags;
 149     case IMGFMT_BGR32:
 150         return use_alpha ? supported_flags : 0;
 151     }
 152     return 0;
 153 }
 154
 155 static void uninit(void)
 156 {
 157     if (avctx)
 158         avcodec_close(avctx);
 159     av_freep(&avctx);
 160     av_freep(&outbuffer);
 161     outbuffer_size = 0;
 162 }
 163
 164 static void check_events(void){}
 165
 166 static int int_zero_to_nine(void *value)
 167 {
 168     int *sh = value;
 169     return *sh >= 0 && *sh <= 9;
 170 }
 171
 172 static const opt_t subopts[] = {
 173     {"alpha", OPT_ARG_BOOL, &use_alpha, NULL},
 174     {"z",   OPT_ARG_INT, &z_compression, int_zero_to_nine},
 175     {NULL}
 176 };
 177
 178 static int preinit(const char *arg)
 179 {
 180     z_compression = 0;
 181     use_alpha = 0;
 182     if (subopt_parse(arg, subopts) != 0) {
 183         return -1;
 184     }
 185     return 0;
 186 }
 187
 188 static int control(uint32_t request, void *data)
 189 {
 190   switch (request) {
 191   case VOCTRL_DRAW_IMAGE:
 192     return draw_image(data);
 193   case VOCTRL_QUERY_FORMAT:
 194     return query_format(*((uint32_t*)data));
 195   }
 196   return VO_NOTIMPL;
 197 }