-
-/*****************************************************************************
- * PNG Encoder
- *****************************************************************************/
-struct encoder_sys_t
-{
- block_t *p_chain;
- mtime_t date;
- vlc_bool_t b_error;
-};
-
-
-static int OpenEncoder( vlc_object_t *p_this )
-{
- encoder_t *p_enc = (encoder_t *)p_this;
- encoder_sys_t *p_sys = p_enc->p_sys;
-
- if( p_enc->fmt_out.i_codec != VLC_FOURCC( 'p', 'n', 'g', ' ' ) &&
- !p_enc->b_force )
- {
- return VLC_EGENERIC;
- }
-
- /* Allocate the memory needed to store the encoder structure */
- if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
- {
- msg_Err( p_enc, "out of memory" );
- return VLC_EGENERIC;
- }
-
- p_enc->p_sys = p_sys;
- p_enc->p_sys->p_chain = NULL;
-
- p_enc->pf_encode_video = Encode;
-
- return VLC_SUCCESS;
-}
-
-static void CloseEncoder( vlc_object_t *p_this )
-{
-}
-
-static void user_write( png_structp p_png, png_bytep data, png_size_t i_length )
-{
- encoder_t *p_enc = (encoder_t *)png_get_io_ptr( p_png );
-
- block_t *p_block = block_New( p_enc, i_length );
-
- memcpy( p_block->p_buffer, data, i_length );
- p_block->i_dts = p_block->i_pts = p_enc->p_sys->date;
- block_ChainAppend( &p_enc->p_sys->p_chain, p_block );
-}
-
-static void user_flush( png_structp p_png )
-{
-}
-
-static void user_write_error( png_structp p_png, png_const_charp error_msg )
-{
- encoder_t *p_enc = (encoder_t *)png_get_error_ptr( p_png );
- p_enc->p_sys->b_error = VLC_TRUE;
- msg_Err( p_enc, error_msg );
-}
-
-static void user_write_warning( png_structp p_png, png_const_charp warning_msg )
-{
- encoder_t *p_enc = (encoder_t *)png_get_error_ptr( p_png );
- msg_Warn( p_enc, warning_msg );
-}
-
-
-static block_t *Encode( encoder_t *p_enc, picture_t *p_pic )
-{
- png_structp p_png;
- png_infop p_info;
- png_bytep *p_row_pointers = NULL;
- int i;
- block_t *p_gather = NULL;
-
- p_enc->p_sys->date = p_pic->date;
-
- p_png = png_create_write_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
- p_info = png_create_info_struct( p_png );
-
- png_set_write_fn( p_png, (void *)p_enc, user_write, user_flush );
- png_set_error_fn( p_png, (void *)p_enc, user_write_error,
- user_write_warning );
-
- png_set_IHDR( p_png, p_info,
- p_pic->format.i_width,
- p_pic->format.i_height,
- 8, PNG_COLOR_TYPE_RGB,
- PNG_INTERLACE_NONE,
- PNG_COMPRESSION_TYPE_DEFAULT,
- PNG_FILTER_TYPE_DEFAULT );
-
- p_row_pointers = malloc( sizeof(png_bytep) * p_pic->format.i_height );
- for( i = 0; i < (int)p_pic->format.i_height; i++ )
- p_row_pointers[i] = p_pic->p->p_pixels + p_pic->p->i_pitch * i;
-
- png_write_info( p_png, p_info );
- png_write_image( p_png, p_row_pointers );
- png_write_end( p_png, p_info );
-
- png_destroy_write_struct( &p_png, &p_info );
-
- if( p_enc->p_sys->p_chain )
- {
- p_gather = block_ChainGather( p_enc->p_sys->p_chain );
- }
- p_enc->p_sys->p_chain = NULL;
-
- free( p_row_pointers );
-
- return p_gather;
-}