/***************************************************************************** * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2. ***************************************************************************** * Copyright (C) 1999-2001 the VideoLAN team * $Id$ * * Authors: Gildas Bazin * Christophe Massiot * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU 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 #include #include #include #include #include /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */ #define AR_SQUARE_PICTURE 1 /* square pixels */ #define AR_4_3_PICTURE 2 /* 4:3 picture (TV) */ #define AR_16_9_PICTURE 3 /* 16:9 picture (wide screen) */ #define AR_221_1_PICTURE 4 /* 2.21:1 picture (movie) */ /***************************************************************************** * decoder_sys_t : libmpeg2 decoder descriptor *****************************************************************************/ struct decoder_sys_t { /* * libmpeg2 properties */ mpeg2dec_t *p_mpeg2dec; const mpeg2_info_t *p_info; bool b_skip; /* * Input properties */ mtime_t i_previous_pts; mtime_t i_current_pts; mtime_t i_previous_dts; mtime_t i_current_dts; int i_current_rate; picture_t * p_picture_to_destroy; 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; /* * Output properties */ decoder_synchro_t *p_synchro; int i_aspect; int i_sar_num; int i_sar_den; mtime_t i_last_frame_pts; }; /***************************************************************************** * Local prototypes *****************************************************************************/ static int OpenDecoder( vlc_object_t * ); static void CloseDecoder( vlc_object_t * ); static picture_t *DecodeBlock( decoder_t *, block_t ** ); static picture_t *GetNewPicture( decoder_t *, uint8_t ** ); static void GetAR( decoder_t *p_dec ); /***************************************************************************** * Module descriptor *****************************************************************************/ vlc_module_begin(); set_description( N_("MPEG I/II video decoder (using libmpeg2)") ); set_capability( "decoder", 150 ); 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_FOURCC('m','p','g','v') && p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') && /* Pinnacle hardware-mpeg1 */ p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') && p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','2','v') && p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') && p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') ) { 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; /* Initialize the thread properties */ memset( p_sys, 0, sizeof(decoder_sys_t) ); 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->p_picture_to_destroy = NULL; p_sys->b_garbage_pic = 0; p_sys->b_slice_i = 0; p_sys->b_second_field = 0; p_sys->b_skip = 0; p_sys->b_preroll = false; #if defined( __i386__ ) || defined( __x86_64__ ) if( vlc_CPU() & CPU_CAPABILITY_MMX ) { i_accel |= MPEG2_ACCEL_X86_MMX; } if( vlc_CPU() & CPU_CAPABILITY_3DNOW ) { i_accel |= MPEG2_ACCEL_X86_3DNOW; } if( vlc_CPU() & CPU_CAPABILITY_MMXEXT ) { i_accel |= MPEG2_ACCEL_X86_MMXEXT; } #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ ) if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC ) { i_accel |= MPEG2_ACCEL_PPC_ALTIVEC; } #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_video = DecodeBlock; 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; picture_t *p_pic; block_t *p_block; if( !pp_block || !*pp_block ) return NULL; p_block = *pp_block; while( 1 ) { state = mpeg2_parse( p_sys->p_mpeg2dec ); switch( state ) { 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 = 1; p_pic = p_sys->p_info->current_fbuf->id; } else { uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break; mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch ); } p_sys->p_picture_to_destroy = p_pic; if ( p_sys->b_slice_i ) { decoder_SynchroNewPicture( p_sys->p_synchro, I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate, 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; /* Reset 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; } p_sys->i_current_rate = p_block->i_rate; 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_SEQUENCE: { /* Initialize video output */ uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; GetAR( p_dec ); mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 ); /* Set the first 2 reference frames */ mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL ); if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) { block_Release( p_block ); return NULL; } mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch ); /* This picture will never go through display_picture. */ p_pic->date = 0; /* For some reason, libmpeg2 will put this pic twice in * discard_picture. This can be considered a bug in libmpeg2. */ p_dec->pf_picture_link( p_dec, p_pic ); if( p_sys->p_synchro ) { decoder_SynchroRelease( p_sys->p_synchro ); } p_sys->p_synchro = decoder_SynchroInit( p_dec, (uint32_t)((uint64_t)1001000000 * 27 / p_sys->p_info->sequence->frame_period) ); p_sys->b_after_sequence_header = 1; } break; case STATE_PICTURE_2ND: p_sys->b_second_field = 1; break; case STATE_PICTURE: { uint8_t *buf[3]; mtime_t i_pts, i_dts; buf[0] = buf[1] = buf[2] = NULL; if ( p_sys->b_after_sequence_header && ((p_sys->p_info->current_picture->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_sys->i_current_rate, 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 ); p_sys->b_slice_i = 1; } p_sys->b_after_sequence_header = 0; #ifdef PIC_FLAG_PTS i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ? ( ( p_sys->p_info->current_picture->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_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY || (p_sys->p_info->current_picture->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_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ? ( ( p_sys->p_info->current_picture->tag == (uint32_t)p_sys->i_current_pts ) ? p_sys->i_current_pts : p_sys->i_previous_pts ) : 0; i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ? ( ( p_sys->p_info->current_picture->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_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE, p_sys->p_info->current_picture->nb_fields == 1 ? 2 : p_sys->p_info->current_picture->nb_fields, i_pts, i_dts, p_sys->i_current_rate, p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ); if( !p_dec->b_pace_control && !p_sys->b_preroll && !(p_sys->b_slice_i && ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) == P_CODING_TYPE)) && !decoder_SynchroChoose( p_sys->p_synchro, p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE, /*p_sys->p_vout->render_time*/ 0 /*FIXME*/, p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) ) { mpeg2_skip( p_sys->p_mpeg2dec, 1 ); p_sys->b_skip = 1; decoder_SynchroTrash( p_sys->p_synchro ); mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL ); } else { mpeg2_skip( p_sys->p_mpeg2dec, 0 ); p_sys->b_skip = 0; decoder_SynchroDecode( p_sys->p_synchro ); if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) { block_Release( p_block ); return NULL; } mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch ); } } break; 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 = (picture_t *)p_sys->p_info->display_fbuf->id; decoder_SynchroEnd( p_sys->p_synchro, p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE, p_sys->b_garbage_pic ); p_sys->b_garbage_pic = 0; if ( p_sys->p_picture_to_destroy != p_pic ) { p_pic->date = decoder_SynchroDate( p_sys->p_synchro ); } else { p_sys->p_picture_to_destroy = NULL; p_pic->date = 0; } } if( p_sys->p_info->discard_fbuf && p_sys->p_info->discard_fbuf->id ) { p_dec->pf_picture_unlink( 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: { uint8_t *buf[3]; buf[0] = buf[1] = buf[2] = NULL; msg_Warn( p_dec, "invalid picture encountered" ); if ( ( p_sys->p_info->current_picture == NULL ) || ( ( p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) ) { if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro ); } mpeg2_skip( p_sys->p_mpeg2dec, 1 ); p_sys->b_skip = 1; if( p_sys->p_info->current_fbuf && p_sys->p_info->current_fbuf->id ) { p_sys->b_garbage_pic = 1; p_pic = p_sys->p_info->current_fbuf->id; } else if( !p_sys->p_info->sequence ) { break; } else { if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break; mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic ); mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch ); } p_sys->p_picture_to_destroy = p_pic; memset( p_pic->p[0].p_pixels, 0, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height ); memset( p_pic->p[1].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); memset( p_pic->p[2].p_pixels, 0x80, p_sys->p_info->sequence->width * p_sys->p_info->sequence->height / 4 ); if( p_sys->b_slice_i ) { decoder_SynchroNewPicture( p_sys->p_synchro, I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate, 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 ); } 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; 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 ); } /***************************************************************************** * GetNewPicture: Get a new picture from the vout and set the buf struct *****************************************************************************/ static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf ) { 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_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2'); /* Get a new picture */ p_pic = p_dec->pf_vout_buffer_new( 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; p_dec->pf_picture_link( p_dec, p_pic ); pp_buf[0] = p_pic->p[0].p_pixels; pp_buf[1] = p_pic->p[1].p_pixels; pp_buf[2] = p_pic->p[2].p_pixels; return p_pic; } /***************************************************************************** * GetAR: Get aspect ratio *****************************************************************************/ static void GetAR( decoder_t *p_dec ) { decoder_sys_t *p_sys = p_dec->p_sys; /* 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; if( p_sys->i_aspect <= AR_221_1_PICTURE ) switch( p_sys->i_aspect ) { case AR_4_3_PICTURE: 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; break; case AR_16_9_PICTURE: p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9; p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 16; p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 9; break; case AR_221_1_PICTURE: p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100; p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 221; p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 100; break; case AR_SQUARE_PICTURE: p_sys->i_aspect = VOUT_ASPECT_FACTOR * p_sys->p_info->sequence->picture_width / p_sys->p_info->sequence->picture_height; p_sys->i_sar_num = p_sys->i_sar_den = 1; break; } } 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; } } 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) ); }