mash.cpp
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:8k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * mash.c: Video decoder using openmash codec implementations
- *****************************************************************************
- * Copyright (C) 2004 the VideoLAN team
- * $Id: 88533cb4796230bc183ea3fe6473c73ca3625648 $
- *
- * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_codec.h>
- #include <vlc_vout.h>
- #include <vlc_block.h>
- #include <p64/p64.h>
- /*****************************************************************************
- * decoder_sys_t : video decoder descriptor
- *****************************************************************************/
- struct decoder_sys_t
- {
- /*
- * Common properties
- */
- mtime_t i_pts;
- IntraP64Decoder *p_decoder;
- bool b_inited;
- int i_counter;
- };
- /****************************************************************************
- * Local prototypes
- ****************************************************************************/
- static int OpenDecoder ( vlc_object_t * );
- static void CloseDecoder ( vlc_object_t * );
- static void *DecodeBlock ( decoder_t *, block_t ** );
- #if 0
- static picture_t *DecodeFrame( decoder_t *, block_t * );
- static block_t *SendFrame ( decoder_t *, block_t * );
- #endif
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- vlc_module_begin ()
- set_description( N_("Video decoder using openmash") )
- set_capability( "decoder", 50 )
- set_category( CAT_INPUT )
- set_subcategory( SUBCAT_INPUT_VCODEC )
- set_callbacks( OpenDecoder, CloseDecoder )
- vlc_module_end ()
- /*****************************************************************************
- * OpenDecoder: probe the decoder and return score
- *****************************************************************************/
- static int OpenDecoder( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t*)p_this;
- decoder_sys_t *p_sys;
- switch( p_dec->fmt_in.i_codec )
- {
- /* Planar YUV */
- case VLC_FOURCC('h','2','6','1'):
- case VLC_FOURCC('H','2','6','1'):
- break;
- default:
- return VLC_EGENERIC;
- }
- /* Allocate the memory needed to store the decoder's structure */
- if( ( p_dec->p_sys = p_sys =
- (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
- return VLC_ENOMEM;
- /* Misc init */
- p_sys->i_pts = 0;
- p_sys->b_inited = false;
- p_sys->i_counter = 0;
- /* Set output properties */
- p_dec->fmt_out.i_cat = VIDEO_ES;
- p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
- /* Set callbacks */
- p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))
- DecodeBlock;
- p_sys->p_decoder = new IntraP64Decoder();
- // foo->sync();
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * CloseDecoder: decoder destruction
- *****************************************************************************/
- static void CloseDecoder( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t*)p_this;
- free( p_dec->p_sys );
- }
- /****************************************************************************
- * DecodeBlock: the whole thing
- ****************************************************************************
- * This function must be fed with complete frames.
- ****************************************************************************/
- static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- block_t *p_block;
- picture_t *p_pic;
- uint32_t i_video_header;
- uint8_t *p_frame;
- int cc, sbit, ebit, mba, gob, quant, mvdh, mvdv;
- int i_width, i_height;
- if( !pp_block || !*pp_block ) return NULL;
- p_block = *pp_block;
- if( !p_sys->i_pts && !p_block->i_pts && !p_block->i_dts )
- {
- /* We've just started the stream, wait for the first PTS. */
- block_Release( p_block );
- return NULL;
- }
- /* Date management */
- if( p_block->i_pts > 0 || p_block->i_dts > 0 )
- {
- if( p_block->i_pts > 0 ) p_sys->i_pts = p_block->i_pts;
- else if( p_block->i_dts > 0 ) p_sys->i_pts = p_block->i_dts;
- }
- i_video_header = *(uint32_t*)p_block->p_buffer; /* yes, it is native endian */
- sbit = i_video_header >> 29; /* start bit position */
- ebit = (i_video_header >> 26) & 7; /* end bit position */
- msg_Dbg( p_dec, "sbit, ebit: %d,%d", sbit, ebit );
- gob = (i_video_header >> 20) & 0xf; /* GOB number */
- if( gob > 12 )
- {
- msg_Warn( p_dec, "invalid gob, buggy vic streamer?");
- }
- mba = (i_video_header >> 15) & 0x1f; /* Macroblock address predictor */
- quant = (i_video_header >> 10) & 0x1f; /* quantizer */
- mvdh = (i_video_header >> 5) & 0x1f; /* horizontal motion vector data */
- mvdv = i_video_header & 0x1f; /* vertical motion vector data */
- cc = p_block->i_buffer - 4;
- msg_Dbg( p_dec, "packet size %d", cc );
- /* Find out p_vdec->i_raw_size */
- p_sys->p_decoder->decode( p_block->p_buffer + 4 /*bp?*/,
- cc /*cc?*/,
- sbit /*sbit?*/,
- ebit /*ebit?*/,
- mba /* mba?*/,
- gob /* gob?*/,
- quant /* quant?*/,
- mvdh /* mvdh?*/,
- mvdv /* mvdv?*/ );
- i_width = p_sys->p_decoder->width();
- i_height = p_sys->p_decoder->height();
- if( !p_sys->b_inited )
- {
- msg_Dbg( p_dec, "video size is perhaps %dx%d", i_width,
- i_height);
- vout_InitFormat( &p_dec->fmt_out.video, VLC_FOURCC('I','4','2','0'),
- i_width, i_height,
- VOUT_ASPECT_FACTOR * i_width / i_height );
- p_sys->b_inited = true;
- }
- p_pic = NULL;
- p_sys->i_counter++;
- // p_sys->p_decoder->sync();
- if( p_block->i_flags & BLOCK_FLAG_END_OF_FRAME )
- {
- p_pic = decoder_NewPicture( p_dec );
- if( !p_pic )
- {
- block_Release( p_block );
- return NULL;
- }
- p_sys->p_decoder->sync();
- p_sys->i_counter = 0;
- p_frame = p_sys->p_decoder->frame();
- vlc_memcpy( p_dec, p_pic->p[0].p_pixels, p_frame, i_width*i_height );
- p_frame += i_width * i_height;
- vlc_memcpy( p_dec, p_pic->p[1].p_pixels, p_frame, i_width*i_height/4 );
- p_frame += i_width * i_height/4;
- vlc_memcpy( p_dec, p_pic->p[2].p_pixels, p_frame, i_width*i_height/4 );
- p_pic->date = p_sys->i_pts;
- }
- block_Release( p_block);
- *pp_block = NULL;
- return p_pic;
- // return NULL;
- }