mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-12 13:44:56 +02:00
909 lines
29 KiB
C
909 lines
29 KiB
C
/*****************************************************************************
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* libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
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*****************************************************************************
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* Copyright (C) 1999-2001 the VideoLAN team
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* $Id$
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*
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* Authors: Gildas Bazin <gbazin@videolan.org>
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* Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <assert.h>
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include <vlc_block_helper.h>
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#include <vlc_cpu.h>
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#include "../codec/cc.h"
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#include <mpeg2.h>
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#include <vlc_codec_synchro.h>
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/*****************************************************************************
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* decoder_sys_t : libmpeg2 decoder descriptor
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*****************************************************************************/
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#define DPB_COUNT (3+1)
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typedef struct
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{
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picture_t *p_picture;
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bool b_linked;
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bool b_displayed;
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} picture_dpb_t;
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struct decoder_sys_t
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{
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/*
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* libmpeg2 properties
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*/
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mpeg2dec_t *p_mpeg2dec;
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const mpeg2_info_t *p_info;
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bool b_skip;
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/*
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* Input properties
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*/
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mtime_t i_previous_pts;
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mtime_t i_current_pts;
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mtime_t i_previous_dts;
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mtime_t i_current_dts;
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bool b_garbage_pic;
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bool b_after_sequence_header; /* is it the next frame after
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* the sequence header ? */
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bool b_slice_i; /* intra-slice refresh stream */
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bool b_second_field;
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bool b_preroll;
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/* */
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picture_dpb_t p_dpb[DPB_COUNT];
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/*
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* Output properties
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*/
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decoder_synchro_t *p_synchro;
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int i_aspect;
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int i_sar_num;
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int i_sar_den;
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mtime_t i_last_frame_pts;
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/* Closed captioning support */
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uint32_t i_cc_flags;
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mtime_t i_cc_pts;
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mtime_t i_cc_dts;
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cc_data_t cc;
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uint8_t *p_gop_user_data;
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uint32_t i_gop_user_data;
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};
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int OpenDecoder( vlc_object_t * );
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static void CloseDecoder( vlc_object_t * );
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static picture_t *DecodeBlock( decoder_t *, block_t ** );
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#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
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static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
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#endif
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static picture_t *GetNewPicture( decoder_t * );
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static void PutPicture( decoder_t *, picture_t * );
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static void GetAR( decoder_t *p_dec );
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static void Reset( decoder_t *p_dec );
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/* */
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static void DpbInit( decoder_t * );
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static void DpbClean( decoder_t * );
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static picture_t *DpbNewPicture( decoder_t * );
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static void DpbUnlinkPicture( decoder_t *, picture_t * );
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static int DpbDisplayPicture( decoder_t *, picture_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin ()
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set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
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set_capability( "decoder", 150 )
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_VCODEC )
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set_callbacks( OpenDecoder, CloseDecoder )
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add_shortcut( "libmpeg2" )
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vlc_module_end ()
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/*****************************************************************************
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* OpenDecoder: probe the decoder and return score
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*****************************************************************************/
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static int OpenDecoder( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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decoder_sys_t *p_sys;
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uint32_t i_accel = 0;
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if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
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return VLC_EGENERIC;
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/* Select onl recognized original format (standard mpeg video) */
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switch( p_dec->fmt_in.i_original_fourcc )
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{
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case VLC_FOURCC('m','p','g','1'):
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case VLC_FOURCC('m','p','g','2'):
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case VLC_FOURCC('m','p','g','v'):
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case VLC_FOURCC('P','I','M','1'):
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case VLC_FOURCC('h','d','v','2'):
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break;
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default:
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if( p_dec->fmt_in.i_original_fourcc )
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return VLC_EGENERIC;
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break;
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}
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/* Allocate the memory needed to store the decoder's structure */
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if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
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return VLC_ENOMEM;
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/* Initialize the thread properties */
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p_sys->p_mpeg2dec = NULL;
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p_sys->p_synchro = NULL;
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p_sys->p_info = NULL;
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p_sys->i_current_pts = 0;
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p_sys->i_previous_pts = 0;
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p_sys->i_current_dts = 0;
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p_sys->i_previous_dts = 0;
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p_sys->i_aspect = 0;
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p_sys->b_garbage_pic = false;
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p_sys->b_slice_i = false;
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p_sys->b_second_field = false;
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p_sys->b_skip = false;
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p_sys->b_preroll = false;
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DpbInit( p_dec );
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p_sys->i_cc_pts = 0;
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p_sys->i_cc_dts = 0;
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p_sys->i_cc_flags = 0;
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#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
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p_dec->pf_get_cc = GetCc;
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cc_Init( &p_sys->cc );
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#endif
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p_sys->p_gop_user_data = NULL;
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p_sys->i_gop_user_data = 0;
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#if defined( __i386__ ) || defined( __x86_64__ )
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if( vlc_CPU() & CPU_CAPABILITY_MMX )
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{
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i_accel |= MPEG2_ACCEL_X86_MMX;
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}
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if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
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{
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i_accel |= MPEG2_ACCEL_X86_3DNOW;
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}
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if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
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{
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i_accel |= MPEG2_ACCEL_X86_MMXEXT;
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}
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#elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
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if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
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{
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i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
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}
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#elif defined(__arm__)
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i_accel |= MPEG2_ACCEL_ARM;
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#else
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/* If we do not know this CPU, trust libmpeg2's feature detection */
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i_accel = MPEG2_ACCEL_DETECT;
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#endif
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/* Set CPU acceleration features */
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mpeg2_accel( i_accel );
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/* Initialize decoder */
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p_sys->p_mpeg2dec = mpeg2_init();
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if( p_sys->p_mpeg2dec == NULL)
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{
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msg_Err( p_dec, "mpeg2_init() failed" );
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free( p_sys );
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return VLC_EGENERIC;
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}
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p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
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p_dec->pf_decode_video = DecodeBlock;
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p_dec->fmt_out.i_cat = VIDEO_ES;
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p_dec->fmt_out.i_codec = 0;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* RunDecoder: the libmpeg2 decoder
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*****************************************************************************/
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static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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mpeg2_state_t state;
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picture_t *p_pic;
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block_t *p_block;
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if( !pp_block || !*pp_block )
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return NULL;
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p_block = *pp_block;
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if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
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Reset( p_dec );
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while( 1 )
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{
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state = mpeg2_parse( p_sys->p_mpeg2dec );
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switch( state )
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{
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case STATE_SEQUENCE:
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{
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/* */
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DpbClean( p_dec );
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/* */
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mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
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/* Set the first 2 reference frames */
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p_sys->i_aspect = 0;
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GetAR( p_dec );
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for( int i = 0; i < 2; i++ )
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{
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picture_t *p_picture = DpbNewPicture( p_dec );
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if( !p_picture )
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{
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Reset( p_dec );
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block_Release( p_block );
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return NULL;
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}
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PutPicture( p_dec, p_picture );
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}
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if( p_sys->p_synchro )
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decoder_SynchroRelease( p_sys->p_synchro );
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if( p_sys->p_info->sequence->frame_period <= 0 )
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p_sys->p_synchro = NULL;
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else
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p_sys->p_synchro =
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decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
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27 / p_sys->p_info->sequence->frame_period) );
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p_sys->b_after_sequence_header = true;
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break;
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}
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case STATE_GOP:
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/* There can be userdata in a GOP. It needs to be remembered for the next picture. */
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if( p_sys->p_info->user_data_len > 2 )
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{
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free( p_sys->p_gop_user_data );
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p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
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if( p_sys->p_gop_user_data )
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{
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p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
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memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
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}
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}
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break;
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case STATE_PICTURE:
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{
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const mpeg2_info_t *p_info = p_sys->p_info;
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const mpeg2_picture_t *p_current = p_info->current_picture;
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mtime_t i_pts, i_dts;
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if( p_sys->b_after_sequence_header &&
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(p_current->flags &
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PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
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{
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/* Intra-slice refresh. Simulate a blank I picture. */
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msg_Dbg( p_dec, "intra-slice refresh stream" );
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decoder_SynchroNewPicture( p_sys->p_synchro,
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I_CODING_TYPE, 2, 0, 0,
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p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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decoder_SynchroDecode( p_sys->p_synchro );
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decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
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p_sys->b_slice_i = true;
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}
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p_sys->b_after_sequence_header = false;
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#ifdef PIC_FLAG_PTS
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i_pts = p_current->flags & PIC_FLAG_PTS ?
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( ( p_current->pts ==
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(uint32_t)p_sys->i_current_pts ) ?
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p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
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i_dts = 0;
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/* Hack to handle demuxers which only have DTS timestamps */
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if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
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{
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if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
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(p_current->flags &
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PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
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{
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i_pts = p_block->i_dts;
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}
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}
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p_block->i_pts = p_block->i_dts = 0;
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/* End hack */
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#else /* New interface */
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i_pts = p_current->flags & PIC_FLAG_TAGS ?
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( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
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p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
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i_dts = p_current->flags & PIC_FLAG_TAGS ?
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( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
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p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
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#endif
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/* If nb_fields == 1, it is a field picture, and it will be
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* followed by another field picture for which we won't call
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* decoder_SynchroNewPicture() because this would have other
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* problems, so we take it into account here.
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* This kind of sucks, but I didn't think better. --Meuuh
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*/
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decoder_SynchroNewPicture( p_sys->p_synchro,
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p_current->flags & PIC_MASK_CODING_TYPE,
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p_current->nb_fields == 1 ? 2 :
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p_current->nb_fields, i_pts, i_dts,
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p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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bool b_skip = false;
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if( !p_dec->b_pace_control && !p_sys->b_preroll &&
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!(p_sys->b_slice_i
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&& ((p_current->flags
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& PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
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&& !decoder_SynchroChoose( p_sys->p_synchro,
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p_current->flags
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& PIC_MASK_CODING_TYPE,
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/*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
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p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
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{
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b_skip = true;
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}
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p_pic = NULL;
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if( !b_skip )
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{
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p_pic = DpbNewPicture( p_dec );
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if( !p_pic )
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{
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Reset( p_dec );
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p_pic = DpbNewPicture( p_dec );
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if( !p_pic )
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{
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mpeg2_reset( p_sys->p_mpeg2dec, 1 );
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block_Release( p_block );
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return NULL;
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}
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}
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}
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if( b_skip || !p_pic )
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{
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mpeg2_skip( p_sys->p_mpeg2dec, 1 );
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p_sys->b_skip = true;
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decoder_SynchroTrash( p_sys->p_synchro );
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PutPicture( p_dec, NULL );
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if( !b_skip )
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{
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block_Release( p_block );
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return NULL;
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}
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}
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else
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{
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mpeg2_skip( p_sys->p_mpeg2dec, 0 );
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p_sys->b_skip = false;
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decoder_SynchroDecode( p_sys->p_synchro );
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PutPicture( p_dec, p_pic );
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}
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if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
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{
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p_sys->i_cc_pts = i_pts;
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p_sys->i_cc_dts = i_dts;
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if( (p_current->flags
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& PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
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p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
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else if( (p_current->flags
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& PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
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p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
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else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
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if( p_sys->i_gop_user_data > 2 )
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{
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/* We now have picture info for any cached user_data out of the gop */
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cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
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p_sys->i_gop_user_data = 0;
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}
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/* Extract the CC from the user_data of the picture */
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if( p_info->user_data_len > 2 )
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cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
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}
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}
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break;
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case STATE_BUFFER:
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if( !p_block->i_buffer )
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{
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block_Release( p_block );
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return NULL;
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}
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if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
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| BLOCK_FLAG_CORRUPTED)) &&
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p_sys->p_synchro &&
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p_sys->p_info->sequence &&
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p_sys->p_info->sequence->width != (unsigned)-1 )
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{
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decoder_SynchroReset( p_sys->p_synchro );
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if( p_sys->p_info->current_fbuf != NULL &&
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p_sys->p_info->current_fbuf->id != NULL )
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{
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p_sys->b_garbage_pic = true;
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}
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if( p_sys->b_slice_i )
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{
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decoder_SynchroNewPicture( p_sys->p_synchro,
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I_CODING_TYPE, 2, 0, 0,
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p_sys->p_info->sequence->flags &
|
|
SEQ_FLAG_LOW_DELAY );
|
|
decoder_SynchroDecode( p_sys->p_synchro );
|
|
decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
|
|
}
|
|
}
|
|
|
|
if( p_block->i_flags & BLOCK_FLAG_PREROLL )
|
|
{
|
|
p_sys->b_preroll = true;
|
|
}
|
|
else if( p_sys->b_preroll )
|
|
{
|
|
p_sys->b_preroll = false;
|
|
if( p_sys->p_synchro )
|
|
decoder_SynchroReset( p_sys->p_synchro );
|
|
}
|
|
|
|
#ifdef PIC_FLAG_PTS
|
|
if( p_block->i_pts )
|
|
{
|
|
mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
|
|
|
|
#else /* New interface */
|
|
if( p_block->i_pts || p_block->i_dts )
|
|
{
|
|
mpeg2_tag_picture( p_sys->p_mpeg2dec,
|
|
(uint32_t)p_block->i_pts,
|
|
(uint32_t)p_block->i_dts );
|
|
#endif
|
|
p_sys->i_previous_pts = p_sys->i_current_pts;
|
|
p_sys->i_current_pts = p_block->i_pts;
|
|
p_sys->i_previous_dts = p_sys->i_current_dts;
|
|
p_sys->i_current_dts = p_block->i_dts;
|
|
}
|
|
|
|
mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
|
|
p_block->p_buffer + p_block->i_buffer );
|
|
|
|
p_block->i_buffer = 0;
|
|
break;
|
|
|
|
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
|
|
|
|
case STATE_SEQUENCE_MODIFIED:
|
|
GetAR( p_dec );
|
|
break;
|
|
#endif
|
|
case STATE_PICTURE_2ND:
|
|
p_sys->b_second_field = true;
|
|
break;
|
|
|
|
|
|
case STATE_INVALID_END:
|
|
case STATE_END:
|
|
case STATE_SLICE:
|
|
p_pic = NULL;
|
|
if( p_sys->p_info->display_fbuf &&
|
|
p_sys->p_info->display_fbuf->id )
|
|
{
|
|
p_pic = p_sys->p_info->display_fbuf->id;
|
|
if( DpbDisplayPicture( p_dec, p_pic ) )
|
|
p_pic = NULL;
|
|
|
|
decoder_SynchroEnd( p_sys->p_synchro,
|
|
p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
|
|
p_sys->b_garbage_pic );
|
|
|
|
if( p_pic )
|
|
{
|
|
p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
|
|
if( p_sys->b_garbage_pic )
|
|
p_pic->date = 0; /* ??? */
|
|
p_sys->b_garbage_pic = false;
|
|
}
|
|
}
|
|
|
|
if( p_sys->p_info->discard_fbuf &&
|
|
p_sys->p_info->discard_fbuf->id )
|
|
{
|
|
DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
|
|
}
|
|
|
|
/* For still frames */
|
|
if( state == STATE_END && p_pic )
|
|
p_pic->b_force = true;
|
|
|
|
if( p_pic )
|
|
{
|
|
/* Avoid frames with identical timestamps.
|
|
* Especially needed for still frames in DVD menus. */
|
|
if( p_sys->i_last_frame_pts == p_pic->date )
|
|
p_pic->date++;
|
|
p_sys->i_last_frame_pts = p_pic->date;
|
|
return p_pic;
|
|
}
|
|
break;
|
|
|
|
case STATE_INVALID:
|
|
{
|
|
msg_Err( p_dec, "invalid picture encountered" );
|
|
/* I don't think we have anything to do, but well without
|
|
* docs ... */
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Never reached */
|
|
return NULL;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* CloseDecoder: libmpeg2 decoder destruction
|
|
*****************************************************************************/
|
|
static void CloseDecoder( vlc_object_t *p_this )
|
|
{
|
|
decoder_t *p_dec = (decoder_t *)p_this;
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
DpbClean( p_dec );
|
|
|
|
free( p_sys->p_gop_user_data );
|
|
|
|
if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
|
|
|
|
if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
|
|
|
|
free( p_sys );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Reset: reset the decoder state
|
|
*****************************************************************************/
|
|
static void Reset( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
cc_Flush( &p_sys->cc );
|
|
mpeg2_reset( p_sys->p_mpeg2dec, 0 );
|
|
DpbClean( p_dec );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* GetNewPicture: Get a new picture from the vout and set the buf struct
|
|
*****************************************************************************/
|
|
static picture_t *GetNewPicture( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
picture_t *p_pic;
|
|
|
|
p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
|
|
p_dec->fmt_out.video.i_visible_width =
|
|
p_sys->p_info->sequence->picture_width;
|
|
p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
|
|
p_dec->fmt_out.video.i_visible_height =
|
|
p_sys->p_info->sequence->picture_height;
|
|
p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
|
|
p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
|
|
p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
|
|
|
|
if( p_sys->p_info->sequence->frame_period > 0 )
|
|
{
|
|
p_dec->fmt_out.video.i_frame_rate =
|
|
(uint32_t)( (uint64_t)1001000000 * 27 /
|
|
p_sys->p_info->sequence->frame_period );
|
|
p_dec->fmt_out.video.i_frame_rate_base = 1001;
|
|
}
|
|
|
|
p_dec->fmt_out.i_codec =
|
|
( p_sys->p_info->sequence->chroma_height <
|
|
p_sys->p_info->sequence->height ) ?
|
|
VLC_CODEC_I420 : VLC_CODEC_I422;
|
|
|
|
/* Get a new picture */
|
|
p_pic = decoder_NewPicture( p_dec );
|
|
|
|
if( p_pic == NULL )
|
|
return NULL;
|
|
|
|
p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
|
|
p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
|
|
p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
|
|
p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
|
|
p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
|
|
p_sys->p_info->current_picture->nb_fields : 2;
|
|
|
|
return p_pic;
|
|
}
|
|
|
|
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
|
|
/*****************************************************************************
|
|
* GetCc: Retrieves the Closed Captions for the CC decoder.
|
|
*****************************************************************************/
|
|
static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
block_t *p_cc = NULL;
|
|
int i;
|
|
|
|
for( i = 0; i < 4; i++ )
|
|
pb_present[i] = p_sys->cc.pb_present[i];
|
|
|
|
if( p_sys->cc.i_data <= 0 )
|
|
return NULL;
|
|
|
|
p_cc = block_New( p_dec, p_sys->cc.i_data);
|
|
if( p_cc )
|
|
{
|
|
memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
|
|
p_cc->i_dts =
|
|
p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
|
|
p_cc->i_flags = ( p_sys->cc.b_reorder ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & ( BLOCK_FLAG_TYPE_I|BLOCK_FLAG_TYPE_P|BLOCK_FLAG_TYPE_B);
|
|
}
|
|
cc_Flush( &p_sys->cc );
|
|
return p_cc;
|
|
}
|
|
#endif
|
|
|
|
/*****************************************************************************
|
|
* GetAR: Get aspect ratio
|
|
*****************************************************************************/
|
|
static void GetAR( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
int i_old_aspect = p_sys->i_aspect;
|
|
|
|
/* Check whether the input gave a particular aspect ratio */
|
|
if( p_dec->fmt_in.video.i_aspect )
|
|
{
|
|
p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
|
|
}
|
|
else
|
|
{
|
|
/* Use the value provided in the MPEG sequence header */
|
|
if( p_sys->p_info->sequence->pixel_height > 0 )
|
|
{
|
|
p_sys->i_aspect =
|
|
((uint64_t)p_sys->p_info->sequence->picture_width) *
|
|
p_sys->p_info->sequence->pixel_width *
|
|
VOUT_ASPECT_FACTOR /
|
|
p_sys->p_info->sequence->picture_height /
|
|
p_sys->p_info->sequence->pixel_height;
|
|
p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
|
|
p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
|
|
}
|
|
else
|
|
{
|
|
/* Invalid aspect, assume 4:3.
|
|
* This shouldn't happen and if it does it is a bug
|
|
* in libmpeg2 (likely triggered by an invalid stream) */
|
|
p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
|
|
p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
|
|
p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
|
|
}
|
|
}
|
|
|
|
if( p_sys->i_aspect == i_old_aspect )
|
|
return;
|
|
|
|
if( p_sys->p_info->sequence->frame_period > 0 )
|
|
msg_Dbg( p_dec,
|
|
"%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
|
|
p_sys->p_info->sequence->picture_width,
|
|
p_sys->p_info->sequence->picture_height,
|
|
p_sys->p_info->sequence->display_width,
|
|
p_sys->p_info->sequence->display_height,
|
|
p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
|
|
(uint32_t)((uint64_t)1001000000 * 27 /
|
|
p_sys->p_info->sequence->frame_period / 1001),
|
|
(uint32_t)((uint64_t)1001000000 * 27 /
|
|
p_sys->p_info->sequence->frame_period % 1001) );
|
|
else
|
|
msg_Dbg( p_dec, "bad frame period" );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* PutPicture: Put a picture_t in mpeg2 context
|
|
*****************************************************************************/
|
|
static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
/* */
|
|
uint8_t *pp_buf[3];
|
|
for( int j = 0; j < 3; j++ )
|
|
pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
|
|
mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
|
|
|
|
/* Completly broken API, why the hell does it suppose
|
|
* the stride of the chroma planes ! */
|
|
if( p_picture )
|
|
mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
|
|
}
|
|
|
|
|
|
/**
|
|
* Initialize a virtual Decoded Picture Buffer to workaround
|
|
* libmpeg2 deficient API
|
|
*/
|
|
static void DpbInit( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
for( int i = 0; i < DPB_COUNT; i++ )
|
|
p_sys->p_dpb[i].p_picture = NULL;
|
|
}
|
|
/**
|
|
* Empty and reset the current DPB
|
|
*/
|
|
static void DpbClean( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
for( int i = 0; i < DPB_COUNT; i++ )
|
|
{
|
|
picture_dpb_t *p = &p_sys->p_dpb[i];
|
|
if( !p->p_picture )
|
|
continue;
|
|
if( p->b_linked )
|
|
decoder_UnlinkPicture( p_dec, p->p_picture );
|
|
if( !p->b_displayed )
|
|
decoder_DeletePicture( p_dec, p->p_picture );
|
|
|
|
p->p_picture = NULL;
|
|
}
|
|
}
|
|
/**
|
|
* Retreive a picture and reserve a place in the DPB
|
|
*/
|
|
static picture_t *DpbNewPicture( decoder_t *p_dec )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
picture_dpb_t *p;
|
|
int i;
|
|
|
|
for( i = 0; i < DPB_COUNT; i++ )
|
|
{
|
|
p = &p_sys->p_dpb[i];
|
|
if( !p->p_picture )
|
|
break;
|
|
}
|
|
if( i >= DPB_COUNT )
|
|
{
|
|
msg_Err( p_dec, "Leaking picture" );
|
|
return NULL;
|
|
}
|
|
|
|
p->p_picture = GetNewPicture( p_dec );
|
|
if( p->p_picture )
|
|
{
|
|
decoder_LinkPicture( p_dec, p->p_picture );
|
|
p->b_linked = true;
|
|
p->b_displayed = false;
|
|
|
|
p->p_picture->date = 0;
|
|
}
|
|
return p->p_picture;
|
|
}
|
|
static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
for( int i = 0; i < DPB_COUNT; i++ )
|
|
{
|
|
picture_dpb_t *p = &p_sys->p_dpb[i];
|
|
if( p->p_picture == p_picture )
|
|
return p;
|
|
}
|
|
return NULL;
|
|
}
|
|
/**
|
|
* Unlink the provided picture and ensure that the decoder
|
|
* does not own it anymore.
|
|
*/
|
|
static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
|
|
{
|
|
picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
|
|
|
|
/* XXX it is needed to workaround libmpeg2 bugs */
|
|
if( !p || !p->b_linked )
|
|
{
|
|
msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
|
|
return;
|
|
}
|
|
|
|
assert( p && p->b_linked );
|
|
|
|
decoder_UnlinkPicture( p_dec, p->p_picture );
|
|
p->b_linked = false;
|
|
|
|
if( !p->b_displayed )
|
|
decoder_DeletePicture( p_dec, p->p_picture );
|
|
p->p_picture = NULL;
|
|
}
|
|
/**
|
|
* Mark the provided picture as displayed.
|
|
*/
|
|
static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
|
|
{
|
|
picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
|
|
|
|
/* XXX it is needed to workaround libmpeg2 bugs */
|
|
if( !p || p->b_displayed || !p->b_linked )
|
|
{
|
|
msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
assert( p && !p->b_displayed && p->b_linked );
|
|
|
|
p->b_displayed = true;
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
|