mirror of https://github.com/mpv-player/mpv
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "config.h"
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#include "mp_msg.h"
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#ifdef HAVE_PNG
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#include <png.h>
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#include "bswap.h"
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#include "postproc/rgb2rgb.h"
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#include "libvo/fastmemcpy.h"
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#include "vd_internal.h"
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static vd_info_t info = {
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"PNG Images decoder",
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"mpng",
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VFM_MPNG,
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"A'rpi",
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".so, based on mpng.c",
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"uses libpng, 8bpp modes not supported yet"
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};
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LIBVD_EXTERN(mpng)
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static unsigned int out_fmt=0;
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static int last_w=-1;
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static int last_h=-1;
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static int last_c=-1;
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// to set/get/query special features/parameters
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static int control(sh_video_t *sh,int cmd,void* arg,...){
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return CONTROL_UNKNOWN;
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}
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// init driver
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static int init(sh_video_t *sh){
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last_w=-1;
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return 1;
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}
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// uninit driver
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static void uninit(sh_video_t *sh){
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}
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//mp_image_t* mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag, int w, int h);
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static int pngPointer;
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static int pngLength;
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static void pngReadFN( png_structp pngstr,png_bytep buffer,png_size_t size )
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{
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char * p = pngstr->io_ptr;
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if(size>pngLength-pngPointer && pngLength>=pngPointer) size=pngLength-pngPointer;
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memcpy( buffer,(char *)&p[pngPointer],size );
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pngPointer+=size;
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}
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// decode a frame
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static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
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png_structp png;
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png_infop info;
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png_infop endinfo;
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// png_bytep data;
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png_bytep * row_p;
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png_uint_32 png_width=0,png_height=0;
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char * palette = NULL;
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int depth,color;
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png_uint_32 i;
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mp_image_t* mpi;
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if(len<=0) return NULL; // skipped frame
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png=png_create_read_struct( PNG_LIBPNG_VER_STRING,NULL,NULL,NULL );
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info=png_create_info_struct( png );
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endinfo=png_create_info_struct( png );
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pngPointer=8;
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pngLength=len;
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png_set_read_fn( png,data,pngReadFN );
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png_set_sig_bytes( png,8 );
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png_read_info( png,info );
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png_get_IHDR( png,info,&png_width,&png_height,&depth,&color,NULL,NULL,NULL );
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png_set_bgr( png );
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switch( info->color_type ) {
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case PNG_COLOR_TYPE_GRAY_ALPHA:
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mp_msg( MSGT_DECVIDEO,MSGL_INFO,"Sorry gray scaled png with alpha channel not supported at moment.\n" );
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break;
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case PNG_COLOR_TYPE_GRAY:
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case PNG_COLOR_TYPE_PALETTE:
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out_fmt=IMGFMT_BGR8;
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break;
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case PNG_COLOR_TYPE_RGB_ALPHA:
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out_fmt=IMGFMT_BGR32;
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break;
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case PNG_COLOR_TYPE_RGB:
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out_fmt=IMGFMT_BGR24;
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break;
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default:
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mp_msg( MSGT_DECVIDEO,MSGL_INFO,"Sorry, unsupported PNG colorspace: %d.\n" ,info->color_type);
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}
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// (re)init libvo if image parameters changed (width/height/colorspace)
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if(last_w!=png_width || last_h!=png_height || last_c!=out_fmt){
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last_w=png_width; last_h=png_height; last_c=out_fmt;
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if(!out_fmt) return NULL;
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mpcodecs_config_vo(sh,png_width,png_height,out_fmt);
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}
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#if 0
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switch( info->color_type )
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{
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case PNG_COLOR_TYPE_GRAY_ALPHA: printf( "[png] used GrayA -> stripping alpha channel\n" ); break;
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case PNG_COLOR_TYPE_GRAY: printf( "[png] used Gray -> rgb\n" ); break;
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case PNG_COLOR_TYPE_PALETTE: printf( "[png] used palette -> rgb\n" ); break;
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case PNG_COLOR_TYPE_RGB_ALPHA: printf( "[png] used RGBA -> stripping alpha channel\n" ); break;
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case PNG_COLOR_TYPE_RGB: printf( "[png] read rgb datas.\n" ); break;
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}
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#endif
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mpi=mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
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png_width,png_height);
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if(!mpi) return NULL;
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// Let's DECODE!
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row_p=(png_bytep*)malloc( sizeof( png_bytep ) * png_height );
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//png_get_rowbytes( png,info )
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for ( i=0; i < png_height; i++ ) row_p[i]=mpi->planes[0] + mpi->stride[0]*i;
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png_read_image( png,row_p );
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free( row_p );
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//png_get_PLTE( png,info,(png_colorp*)&pal,&cols );
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png_read_end( png,endinfo );
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png_destroy_read_struct( &png,&info,&endinfo );
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return mpi;
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}
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#endif
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