/***************************************************************************** * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2. ***************************************************************************** * Copyright (C) 1999-2001 VLC authors and VideoLAN * $Id$ * * Authors: Gildas Bazin * Christophe Massiot * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser 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. *****************************************************************************/ /***************************************************************************** * NOTA BENE: this module requires the linking against a library which is * known to require licensing under the GNU General Public License version 2 * (or later). Therefore, the result of compiling this module will normally * be subject to the terms of that later license. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #warning This module is not officially supported anymore #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include #include "cc.h" #include "synchro.h" #include /***************************************************************************** * decoder_sys_t : libmpeg2 decoder descriptor *****************************************************************************/ #define DPB_COUNT (3+1) typedef struct { picture_t *p_picture; bool b_linked; bool b_displayed; } picture_dpb_t; struct decoder_sys_t { /* * libmpeg2 properties */ mpeg2dec_t *p_mpeg2dec; const mpeg2_info_t *p_info; bool b_skip; /* * Input properties */ vlc_tick_t i_previous_pts; vlc_tick_t i_current_pts; vlc_tick_t i_previous_dts; vlc_tick_t i_current_dts; bool b_garbage_pic; bool b_after_sequence_header; /* is it the next frame after * the sequence header ? */ bool b_slice_i; /* intra-slice refresh stream */ bool b_second_field; bool b_preroll; /* */ picture_dpb_t p_dpb[DPB_COUNT]; /* * Output properties */ decoder_synchro_t *p_synchro; int i_sar_num; int i_sar_den; vlc_tick_t i_last_frame_pts; /* Closed captioning support */ uint32_t i_cc_flags; vlc_tick_t i_cc_pts; vlc_tick_t i_cc_dts; #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) cc_data_t cc; #endif uint8_t *p_gop_user_data; uint32_t i_gop_user_data; }; /***************************************************************************** * Local prototypes *****************************************************************************/ static int OpenDecoder( vlc_object_t * ); static void CloseDecoder( vlc_object_t * ); static int DecodeVideo( decoder_t *, block_t *); #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) static void SendCc( decoder_t *p_dec ); #endif static picture_t *GetNewPicture( decoder_t * ); static void PutPicture( decoder_t *, picture_t * ); static void GetAR( decoder_t *p_dec ); static void Reset( decoder_t *p_dec ); /* */ static void DpbInit( decoder_t * ); static void DpbClean( decoder_t * ); static picture_t *DpbNewPicture( decoder_t * ); static void DpbUnlinkPicture( decoder_t *, picture_t * ); static int DpbDisplayPicture( decoder_t *, picture_t * ); /***************************************************************************** * Module descriptor *****************************************************************************/ vlc_module_begin () set_description( N_("MPEG I/II video decoder (using libmpeg2)") ) set_capability( "video decoder", 50 ) set_category( CAT_INPUT ) set_subcategory( SUBCAT_INPUT_VCODEC ) set_callbacks( OpenDecoder, CloseDecoder ) add_shortcut( "libmpeg2" ) 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; uint32_t i_accel = 0; if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV ) return VLC_EGENERIC; /* Select only recognized original format (standard mpeg video) */ switch( p_dec->fmt_in.i_original_fourcc ) { case VLC_FOURCC('m','p','g','1'): case VLC_FOURCC('m','p','g','2'): case VLC_FOURCC('m','p','g','v'): case VLC_FOURCC('P','I','M','1'): case VLC_FOURCC('h','d','v','2'): break; default: if( p_dec->fmt_in.i_original_fourcc ) return VLC_EGENERIC; break; } /* Allocate the memory needed to store the decoder's structure */ if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL ) return VLC_ENOMEM; /* Initialize the thread properties */ p_sys->p_mpeg2dec = NULL; p_sys->p_synchro = NULL; p_sys->p_info = NULL; p_sys->i_current_pts = 0; p_sys->i_previous_pts = 0; p_sys->i_current_dts = 0; p_sys->i_previous_dts = 0; p_sys->i_sar_num = 0; p_sys->i_sar_den = 0; p_sys->b_garbage_pic = false; p_sys->b_slice_i = false; p_sys->b_second_field = false; p_sys->b_skip = false; p_sys->b_preroll = false; DpbInit( p_dec ); p_sys->i_cc_pts = 0; p_sys->i_cc_dts = 0; p_sys->i_cc_flags = 0; #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) cc_Init( &p_sys->cc ); #endif p_sys->p_gop_user_data = NULL; p_sys->i_gop_user_data = 0; #if defined( __i386__ ) || defined( __x86_64__ ) if( vlc_CPU_MMX() ) i_accel |= MPEG2_ACCEL_X86_MMX; if( vlc_CPU_3dNOW() ) i_accel |= MPEG2_ACCEL_X86_3DNOW; if( vlc_CPU_MMXEXT() ) i_accel |= MPEG2_ACCEL_X86_MMXEXT; #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ ) if( vlc_CPU_ALTIVEC() ) i_accel |= MPEG2_ACCEL_PPC_ALTIVEC; #elif defined(__arm__) # ifdef MPEG2_ACCEL_ARM i_accel |= MPEG2_ACCEL_ARM; # endif # ifdef MPEG2_ACCEL_ARM_NEON if( vlc_CPU_ARM_NEON() ) i_accel |= MPEG2_ACCEL_ARM_NEON; # endif /* TODO: sparc */ #else /* If we do not know this CPU, trust libmpeg2's feature detection */ i_accel = MPEG2_ACCEL_DETECT; #endif /* Set CPU acceleration features */ mpeg2_accel( i_accel ); /* Initialize decoder */ p_sys->p_mpeg2dec = mpeg2_init(); if( p_sys->p_mpeg2dec == NULL) { msg_Err( p_dec, "mpeg2_init() failed" ); free( p_sys ); return VLC_EGENERIC; } p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec ); p_dec->pf_decode = DecodeVideo; p_dec->pf_flush = Reset; p_dec->fmt_out.i_codec = 0; return VLC_SUCCESS; } /***************************************************************************** * RunDecoder: the libmpeg2 decoder *****************************************************************************/ static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block ) { decoder_sys_t *p_sys = p_dec->p_sys; mpeg2_state_t state; block_t *p_block; if( !pp_block || !*pp_block ) return NULL; p_block = *pp_block; if( p_block->i_flags & (BLOCK_FLAG_CORRUPTED) ) Reset( p_dec ); while( 1 ) { state = mpeg2_parse( p_sys->p_mpeg2dec ); switch( state ) { case STATE_SEQUENCE: { /* */ DpbClean( p_dec ); /* */ mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 ); if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro ); if( p_sys->p_info->sequence->frame_period <= 0 ) p_sys->p_synchro = NULL; else p_sys->p_synchro = decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) * 27 / p_sys->p_info->sequence->frame_period) ); p_sys->b_after_sequence_header = true; /* Set the first 2 reference frames */ GetAR( p_dec ); for( int i = 0; i < 2; i++ ) { picture_t *p_picture = DpbNewPicture( p_dec ); if( !p_picture ) { Reset( p_dec ); block_Release( p_block ); return NULL; } PutPicture( p_dec, p_picture ); } break; } case STATE_GOP: /* There can be userdata in a GOP. It needs to be remembered for the next picture. */ if( p_sys->p_info->user_data_len > 2 ) { free( p_sys->p_gop_user_data ); p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) ); if( p_sys->p_gop_user_data ) { p_sys->i_gop_user_data = p_sys->p_info->user_data_len; memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len ); } } break; case STATE_PICTURE: { const mpeg2_info_t *p_info = p_sys->p_info; const mpeg2_picture_t *p_current = p_info->current_picture; vlc_tick_t i_pts, i_dts; if( p_sys->b_after_sequence_header && (p_current->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P ) { /* Intra-slice refresh. Simulate a blank I picture. */ msg_Dbg( p_dec, "intra-slice refresh stream" ); decoder_SynchroNewPicture( p_sys->p_synchro, I_CODING_TYPE, 2, 0, 0, p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ); decoder_SynchroDecode( p_sys->p_synchro ); decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 ); p_sys->b_slice_i = true; } p_sys->b_after_sequence_header = false; #ifdef PIC_FLAG_PTS i_pts = p_current->flags & PIC_FLAG_PTS ? ( ( p_current->pts == (uint32_t)p_sys->i_current_pts ) ? p_sys->i_current_pts : p_sys->i_previous_pts ) : 0; i_dts = 0; /* Hack to handle demuxers which only have DTS timestamps */ if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 ) { if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY || (p_current->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B ) { i_pts = p_block->i_dts; } } p_block->i_pts = p_block->i_dts = 0; /* End hack */ #else /* New interface */ i_pts = p_current->flags & PIC_FLAG_TAGS ? ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ? p_sys->i_current_pts : p_sys->i_previous_pts ) : 0; i_dts = p_current->flags & PIC_FLAG_TAGS ? ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ? p_sys->i_current_dts : p_sys->i_previous_dts ) : 0; #endif /* If nb_fields == 1, it is a field picture, and it will be * followed by another field picture for which we won't call * decoder_SynchroNewPicture() because this would have other * problems, so we take it into account here. * This kind of sucks, but I didn't think better. --Meuuh */ decoder_SynchroNewPicture( p_sys->p_synchro, p_current->flags & PIC_MASK_CODING_TYPE, p_current->nb_fields == 1 ? 2 : p_current->nb_fields, i_pts, i_dts, p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ); picture_t *p_pic; if( p_dec->b_frame_drop_allowed && !p_sys->b_preroll && !(p_sys->b_slice_i && ((p_current->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P)) && !decoder_SynchroChoose( p_sys->p_synchro, p_current->flags & PIC_MASK_CODING_TYPE, /*p_sys->p_vout->render_time*/ 0 /*FIXME*/, p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) ) p_pic = NULL; else { p_pic = DpbNewPicture( p_dec ); if( !p_pic ) { Reset( p_dec ); p_pic = DpbNewPicture( p_dec ); if( !p_pic ) { mpeg2_reset( p_sys->p_mpeg2dec, 1 ); block_Release( p_block ); return NULL; } } } mpeg2_skip( p_sys->p_mpeg2dec, p_pic == NULL ); p_sys->b_skip = p_pic == NULL; if( p_pic != NULL ) decoder_SynchroDecode( p_sys->p_synchro ); else decoder_SynchroTrash( p_sys->p_synchro ); PutPicture( p_dec, p_pic ); if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 ) { p_sys->i_cc_pts = i_pts; p_sys->i_cc_dts = i_dts; if( (p_current->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P ) p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P; else if( (p_current->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B ) p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B; else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I; #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) bool b_top_field_first = p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST; #endif if( p_sys->i_gop_user_data > 2 ) { /* We now have picture info for any cached user_data out of the gop */ #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) cc_ProbeAndExtract( &p_sys->cc, b_top_field_first, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data ); #endif p_sys->i_gop_user_data = 0; } /* Extract the CC from the user_data of the picture */ #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) if( p_info->user_data_len > 2 ) cc_ProbeAndExtract( &p_sys->cc, b_top_field_first, &p_info->user_data[0], p_info->user_data_len ); if( p_sys->cc.i_data ) SendCc( p_dec ); #endif } } break; case STATE_BUFFER: if( !p_block->i_buffer ) { block_Release( p_block ); return NULL; } if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED)) && p_sys->p_synchro && p_sys->p_info->sequence && p_sys->p_info->sequence->width != (unsigned)-1 ) { decoder_SynchroReset( p_sys->p_synchro ); if( p_sys->p_info->current_fbuf != NULL && p_sys->p_info->current_fbuf->id != NULL ) { p_sys->b_garbage_pic = true; } if( p_sys->b_slice_i ) { decoder_SynchroNewPicture( p_sys->p_synchro, I_CODING_TYPE, 2, 0, 0, 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: { picture_t *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 ); } if( p_pic ) { if( state == STATE_END ) p_pic->b_force = true; /* For still frames */ /* 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; } static int DecodeVideo( decoder_t *p_dec, block_t *p_block) { if( p_block == NULL ) /* No Drain */ return VLCDEC_SUCCESS; block_t **pp_block = &p_block; picture_t *p_pic; while( ( p_pic = DecodeBlock( p_dec, pp_block ) ) != NULL ) decoder_QueueVideo( p_dec, p_pic ); return VLCDEC_SUCCESS; } /***************************************************************************** * 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; #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) cc_Flush( &p_sys->cc ); #endif 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; #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0) cc_Flush( &p_sys->cc ); #endif 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_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 */ if( decoder_UpdateVideoFormat( p_dec ) ) return NULL; 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) /***************************************************************************** * SendCc: Sends the Closed Captions for the CC decoder. *****************************************************************************/ static void SendCc( decoder_t *p_dec ) { decoder_sys_t *p_sys = p_dec->p_sys; block_t *p_cc = NULL; if( !p_sys->cc.b_reorder && p_sys->cc.i_data <= 0 ) return; p_cc = block_Alloc( 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->i_cc_flags & BLOCK_FLAG_TYPE_MASK; decoder_cc_desc_t desc; desc.i_608_channels = p_sys->cc.i_608channels; desc.i_708_channels = p_sys->cc.i_708channels; desc.i_reorder_depth = p_sys->cc.b_reorder ? 0 : -1; decoder_QueueCc( p_dec, p_cc, &desc ); } cc_Flush( &p_sys->cc ); return; } #endif /***************************************************************************** * GetAR: Get aspect ratio *****************************************************************************/ static void GetAR( decoder_t *p_dec ) { decoder_sys_t *p_sys = p_dec->p_sys; int i_old_sar_num = p_sys->i_sar_num; int i_old_sar_den = p_sys->i_sar_den; /* Check whether the input gave a particular aspect ratio */ if( p_dec->fmt_in.video.i_sar_num > 0 && p_dec->fmt_in.video.i_sar_den > 0 ) { p_sys->i_sar_num = p_dec->fmt_in.video.i_sar_num; p_sys->i_sar_den = p_dec->fmt_in.video.i_sar_den; } /* Use the value provided in the MPEG sequence header */ else if( p_sys->p_info->sequence->pixel_height > 0 ) { 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_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_sar_num == i_old_sar_num && p_sys->i_sar_den == i_old_sar_den ) return; if( p_sys->p_info->sequence->frame_period > 0 ) msg_Dbg( p_dec, "%dx%d (display %d,%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_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 ); /* Completely 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 ) picture_Release( p->p_picture ); if( !p->b_displayed ) picture_Release( p->p_picture ); p->p_picture = NULL; } } /** * Retrieve 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 ) { picture_Hold( 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 ); picture_Release( p->p_picture ); p->b_linked = false; if( !p->b_displayed ) picture_Release( 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; }