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vlc/modules/packetizer/mpegvideo.c

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/*****************************************************************************
* mpegvideo.c: parse and packetize an MPEG1/2 video stream
*****************************************************************************
* Copyright (C) 2001-2006 VLC authors and VideoLAN
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
* Gildas Bazin <gbazin@videolan.org>
* Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
*
* 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.
*****************************************************************************/
/*****************************************************************************
* Problem with this implementation:
*
* Although we should time-stamp each picture with a PTS, this isn't possible
* with the current implementation.
* The problem comes from the fact that for non-low-delay streams we can't
* calculate the PTS of pictures used as backward reference. Even the temporal
* reference number doesn't help here because all the pictures don't
* necessarily have the same duration (eg. 3:2 pulldown).
*
* However this doesn't really matter as far as the MPEG muxers are concerned
* because they allow having empty PTS fields. --gibalou
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_block.h>
#include <vlc_codec.h>
#include <vlc_block_helper.h>
#include "mpegvideo.h"
#include "../codec/cc.h"
#include "packetizer_helper.h"
#include "startcode_helper.h"
#include "iso_color_tables.h"
#include <limits.h>
#define SYNC_INTRAFRAME_TEXT N_("Sync on Intra Frame")
#define SYNC_INTRAFRAME_LONGTEXT N_("Normally the packetizer would " \
"sync on the next full frame. This flags instructs the packetizer " \
"to sync on the first Intra Frame found.")
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin ()
set_subcategory( SUBCAT_SOUT_PACKETIZER )
set_description( N_("MPEG-I/II video packetizer") )
set_shortname( N_("MPEG Video") )
set_capability( "packetizer", 50 )
set_callbacks( Open, Close )
add_bool( "packetizer-mpegvideo-sync-iframe", false, SYNC_INTRAFRAME_TEXT,
SYNC_INTRAFRAME_LONGTEXT )
vlc_module_end ()
enum mpeg_startcode_e
{
PICTURE_STARTCODE = 0x00,
SLICE_STARTCODE_FIRST = 0x01,
SLICE_STARTCODE_LAST = 0xAF,
USER_DATA_STARTCODE = 0xB2,
SEQUENCE_HEADER_STARTCODE = 0xB3,
SEQUENCE_ERROR_STARTCODE = 0xB4,
EXTENSION_STARTCODE = 0xB5,
SEQUENCE_END_STARTCODE = 0xB7,
GROUP_STARTCODE = 0xB8,
SYSTEM_STARTCODE_FIRST = 0xB9,
SYSTEM_STARTCODE_LAST = 0xFF,
};
enum extension_start_code_identifier_e
{
SEQUENCE_EXTENSION_ID = 0x01,
SEQUENCE_DISPLAY_EXTENSION_ID = 0x02,
QUANT_MATRIX_EXTENSION_ID = 0x03,
COPYRIGHT_EXTENSION_ID = 0x04,
SEQUENCE_SCALABLE_EXTENSION_ID = 0x05,
PICTURE_DISPLAY_EXTENSION_ID = 0x07,
PICTURE_CODING_EXTENSION_ID = 0x08,
PICTURE_SPATIAL_SCALABLE_EXTENSION_ID = 0x09,
PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID = 0x0A,
CAMERA_PARAMETERS_EXTENSION_ID = 0x0B,
ITU_T_EXTENSION_ID = 0x0C,
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
typedef struct
{
/*
* Input properties
*/
packetizer_t packetizer;
/* Sequence header and extension */
block_t *p_seq;
block_t *p_ext;
/* Current frame being built */
block_t *p_frame;
block_t **pp_last;
bool b_frame_slice;
vlc_tick_t i_pts;
vlc_tick_t i_dts;
date_t dts;
date_t prev_iframe_dts;
/* Sequence properties */
uint16_t i_h_size_value;
uint16_t i_v_size_value;
uint8_t i_aspect_ratio_info;
uint8_t i_frame_rate_value;
uint32_t i_bitratelower18;
/* Extended Sequence properties (MPEG2) */
uint8_t i_h_size_ext;
uint8_t i_v_size_ext;
uint16_t i_bitrateupper12;
bool b_seq_progressive;
bool b_low_delay;
uint8_t i_frame_rate_ext_n;
uint8_t i_frame_rate_ext_d;
/* Picture properties */
int i_temporal_ref;
int i_prev_temporal_ref;
int i_picture_type;
int i_picture_structure;
int i_top_field_first;
int i_repeat_first_field;
int i_progressive_frame;
vlc_tick_t i_last_ref_pts;
vlc_tick_t i_last_frame_pts;
uint16_t i_last_frame_refid;
bool b_second_field;
/* Number of pictures since last sequence header */
unsigned i_seq_old;
/* Sync behaviour */
bool b_sync_on_intra_frame;
bool b_waiting_iframe;
int i_next_block_flags;
/* */
bool b_cc_reset;
uint32_t i_cc_flags;
vlc_tick_t i_cc_pts;
vlc_tick_t i_cc_dts;
cc_data_t cc;
} decoder_sys_t;
static block_t *Packetize( decoder_t *, block_t ** );
static void PacketizeFlush( decoder_t * );
static block_t *GetCc( decoder_t *p_dec, decoder_cc_desc_t * );
static void PacketizeReset( void *p_private, bool b_broken );
static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t * );
static int PacketizeValidate( void *p_private, block_t * );
static block_t * PacketizeDrain( void *p_private );
static block_t *ParseMPEGBlock( decoder_t *, block_t * );
static const uint8_t p_mp2v_startcode[3] = { 0x00, 0x00, 0x01 };
/*****************************************************************************
* Open:
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
if( p_dec->fmt_in->i_codec != VLC_CODEC_MPGV &&
p_dec->fmt_in->i_codec != VLC_CODEC_MP2V )
return VLC_EGENERIC;
p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
if( !p_dec->p_sys )
return VLC_ENOMEM;
memset( p_dec->p_sys, 0, sizeof( decoder_sys_t ) );
p_dec->fmt_out.i_codec = VLC_CODEC_MPGV;
p_dec->fmt_out.i_original_fourcc = p_dec->fmt_in->i_original_fourcc;
/* Misc init */
packetizer_Init( &p_sys->packetizer,
p_mp2v_startcode, sizeof(p_mp2v_startcode), startcode_FindAnnexB,
NULL, 0, 4,
PacketizeReset, PacketizeParse, PacketizeValidate, PacketizeDrain,
p_dec );
p_sys->p_seq = NULL;
p_sys->p_ext = NULL;
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
p_sys->b_frame_slice = false;
p_sys->i_dts =
p_sys->i_pts = VLC_TICK_INVALID;
unsigned num, den;
if( p_dec->fmt_in->video.i_frame_rate && p_dec->fmt_in->video.i_frame_rate_base )
{
num = p_dec->fmt_in->video.i_frame_rate;
den = p_dec->fmt_in->video.i_frame_rate_base;
}
else
{
num = 30000;
den = 1001;
}
date_Init( &p_sys->dts, 2 * num, den ); /* fields / den */
date_Init( &p_sys->prev_iframe_dts, 2 * num, den );
p_sys->i_h_size_value = 0;
p_sys->i_v_size_value = 0;
p_sys->i_aspect_ratio_info = 0;
p_sys->i_frame_rate_value = 0;
p_sys->i_bitratelower18 = 0;
p_sys->i_bitrateupper12 = 0;
p_sys->i_h_size_ext = 0;
p_sys->i_v_size_ext = 0;
p_sys->b_seq_progressive = true;
p_sys->b_low_delay = false;
p_sys->i_frame_rate_ext_n = 0;
p_sys->i_frame_rate_ext_d = 0;
p_sys->i_seq_old = 0;
p_sys->i_temporal_ref = 0;
p_sys->i_prev_temporal_ref = 2048;
p_sys->i_picture_type = 0;
p_sys->i_picture_structure = 0x03; /* frame */
p_sys->i_top_field_first = 0;
p_sys->i_repeat_first_field = 0;
p_sys->i_progressive_frame = 0;
p_sys->i_last_ref_pts = VLC_TICK_INVALID;
p_sys->b_second_field = 0;
p_sys->i_next_block_flags = 0;
p_sys->i_last_frame_refid = 0;
p_sys->b_waiting_iframe =
p_sys->b_sync_on_intra_frame = var_CreateGetBool( p_dec, "packetizer-mpegvideo-sync-iframe" );
if( p_sys->b_sync_on_intra_frame )
msg_Dbg( p_dec, "syncing on intra frame now" );
p_sys->b_cc_reset = false;
p_sys->i_cc_pts = 0;
p_sys->i_cc_dts = 0;
p_sys->i_cc_flags = 0;
cc_Init( &p_sys->cc );
p_dec->pf_packetize = Packetize;
p_dec->pf_flush = PacketizeFlush;
p_dec->pf_get_cc = GetCc;
return VLC_SUCCESS;
}
/*****************************************************************************
* Close:
*****************************************************************************/
static void Close( 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_seq )
{
block_Release( p_sys->p_seq );
}
if( p_sys->p_ext )
{
block_Release( p_sys->p_ext );
}
if( p_sys->p_frame )
{
block_ChainRelease( p_sys->p_frame );
}
packetizer_Clean( &p_sys->packetizer );
var_Destroy( p_dec, "packetizer-mpegvideo-sync-iframe" );
free( p_sys );
}
/*****************************************************************************
* Packetize:
*****************************************************************************/
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
return packetizer_Packetize( &p_sys->packetizer, pp_block );
}
static void PacketizeFlush( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
packetizer_Flush( &p_sys->packetizer );
}
/*****************************************************************************
* GetCc:
*****************************************************************************/
static block_t *GetCc( decoder_t *p_dec, decoder_cc_desc_t *p_desc )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_cc;
if( !p_sys->cc.b_reorder && p_sys->cc.i_data <= 0 )
return NULL;
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;
p_desc->i_608_channels = p_sys->cc.i_608channels;
p_desc->i_708_channels = p_sys->cc.i_708channels;
p_desc->i_reorder_depth = p_sys->cc.b_reorder ? 0 : -1;
}
cc_Flush( &p_sys->cc );
return p_cc;
}
/*****************************************************************************
* ProcessSequenceParameters
*****************************************************************************/
static void ProcessSequenceParameters( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
video_format_t *fmt = &p_dec->fmt_out.video;
/* Picture size */
fmt->i_visible_width = p_sys->i_h_size_value + (p_sys->i_h_size_ext << 14);
fmt->i_width = (fmt->i_visible_width + 0x0F) & ~0x0F;
fmt->i_visible_height = p_sys->i_v_size_value + (p_sys->i_v_size_ext << 14);
if( p_sys->b_seq_progressive )
fmt->i_height = (fmt->i_visible_height + 0x0F) & ~0x0F;
else
fmt->i_height = (fmt->i_visible_height + 0x1F) & ~0x1F;
/* Bitrate */
if( p_dec->fmt_out.i_bitrate == 0 )
p_dec->fmt_out.i_bitrate = ((p_sys->i_bitrateupper12 << 18) |
p_sys->i_bitratelower18) * 400;
/* Frame Rate */
/* Only of not specified by container */
if ( !p_dec->fmt_in->video.i_frame_rate ||
!p_dec->fmt_in->video.i_frame_rate_base )
{
static const int code_to_frame_rate[16][2] =
{
{ 1, 1 }, /* invalid */
{ 24000, 1001 }, { 24, 1 }, { 25, 1 }, { 30000, 1001 },
{ 30, 1 }, { 50, 1 }, { 60000, 1001 }, { 60, 1 },
/* Unofficial 15fps from Xing*/
{ 15, 1 },
/* Unofficial economy rates from libmpeg3 */
{ 5, 1 }, { 10, 1 }, { 12, 1 }, { 15, 1 },
{ 1, 1 }, { 1, 1 } /* invalid */
};
/* frames / den */
unsigned num = code_to_frame_rate[p_sys->i_frame_rate_value][0] << 1;
unsigned den = code_to_frame_rate[p_sys->i_frame_rate_value][1];
if( p_sys->i_frame_rate_ext_n || p_sys->i_frame_rate_ext_d )
{
vlc_ureduce( &num, &den,
num * (1 + p_sys->i_frame_rate_ext_n),
den * (1 + p_sys->i_frame_rate_ext_d),
CLOCK_FREQ );
}
if( num && den ) /* fields / den */
{
date_Change( &p_sys->dts, num, den );
date_Change( &p_sys->prev_iframe_dts, num, den );
}
}
if( fmt->i_frame_rate != (p_sys->dts.i_divider_num >> 1) ||
fmt->i_frame_rate_base != p_sys->dts.i_divider_den )
{
fmt->i_frame_rate = p_sys->dts.i_divider_num >> 1;
fmt->i_frame_rate_base = p_sys->dts.i_divider_den;
msg_Dbg( p_dec, "size %ux%u/%ux%u fps %u:%u",
fmt->i_visible_width, fmt->i_visible_height,
fmt->i_width, fmt->i_height,
fmt->i_frame_rate, fmt->i_frame_rate_base);
}
}
/*****************************************************************************
* OutputFrame: assemble and tag frame
*****************************************************************************/
static block_t *OutputFrame( decoder_t *p_dec )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
if( !p_sys->p_frame )
return NULL;
ProcessSequenceParameters( p_dec );
p_pic = block_ChainGather( p_sys->p_frame );
if( p_pic == NULL )
{
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
p_sys->b_frame_slice = false;
return p_pic;
}
unsigned i_num_fields;
if( !p_sys->b_seq_progressive && p_sys->i_picture_structure != 0x03 /* Field Picture */ )
i_num_fields = 1;
else
i_num_fields = 2;
if( p_sys->b_seq_progressive )
{
if( p_sys->i_top_field_first == 0 &&
p_sys->i_repeat_first_field == 1 )
{
i_num_fields *= 2;
}
else if( p_sys->i_top_field_first == 1 &&
p_sys->i_repeat_first_field == 1 )
{
i_num_fields *= 3;
}
}
else
{
if( p_sys->i_picture_structure == 0x03 /* Frame Picture */ )
{
if( p_sys->i_progressive_frame && p_sys->i_repeat_first_field )
{
i_num_fields += 1;
}
}
}
switch ( p_sys->i_picture_type )
{
case 0x01:
p_pic->i_flags |= BLOCK_FLAG_TYPE_I;
break;
case 0x02:
p_pic->i_flags |= BLOCK_FLAG_TYPE_P;
break;
case 0x03:
p_pic->i_flags |= BLOCK_FLAG_TYPE_B;
break;
}
if( !p_sys->b_seq_progressive )
{
if( p_sys->i_picture_structure < 0x03 )
{
p_pic->i_flags |= BLOCK_FLAG_SINGLE_FIELD;
p_pic->i_flags |= (p_sys->i_picture_structure == 0x01) ? BLOCK_FLAG_TOP_FIELD_FIRST
: BLOCK_FLAG_BOTTOM_FIELD_FIRST;
}
else /* if( p_sys->i_picture_structure == 0x03 ) */
{
p_pic->i_flags |= (p_sys->i_top_field_first) ? BLOCK_FLAG_TOP_FIELD_FIRST
: BLOCK_FLAG_BOTTOM_FIELD_FIRST;
}
}
/* Special case for DVR-MS where we need to fully build pts from scratch
* and only use first dts as it does not monotonically increase
* This will NOT work with frame repeats and such, as we would need to fully
* fill the DPB to get accurate pts timings. */
if( unlikely( p_dec->fmt_in->i_original_fourcc == VLC_FOURCC( 'D','V','R',' ') ) )
{
const bool b_first_xmited = (p_sys->i_prev_temporal_ref != p_sys->i_temporal_ref );
if( ( p_pic->i_flags & BLOCK_FLAG_TYPE_I ) && b_first_xmited )
{
if( date_Get( &p_sys->prev_iframe_dts ) == VLC_TICK_INVALID )
{
if( p_sys->i_dts != VLC_TICK_INVALID )
{
date_Set( &p_sys->dts, p_sys->i_dts );
}
else
{
if( date_Get( &p_sys->dts ) == VLC_TICK_INVALID )
{
date_Set( &p_sys->dts, VLC_TICK_0 );
}
}
}
p_sys->prev_iframe_dts = p_sys->dts;
}
p_pic->i_dts = date_Get( &p_sys->dts );
/* Compute pts from poc */
date_t datepts = p_sys->prev_iframe_dts;
date_Increment( &datepts, (1 + p_sys->i_temporal_ref) * 2 );
/* Field picture second field case */
if( p_sys->i_picture_structure != 0x03 )
{
/* first sent is not the first in display order */
if( (p_sys->i_picture_structure >> 1) != !p_sys->i_top_field_first &&
b_first_xmited )
{
date_Increment( &datepts, 2 );
}
}
p_pic->i_pts = date_Get( &datepts );
if( date_Get( &p_sys->dts ) != VLC_TICK_INVALID )
{
date_Increment( &p_sys->dts, i_num_fields );
p_pic->i_length = date_Get( &p_sys->dts ) - p_pic->i_dts;
}
p_sys->i_prev_temporal_ref = p_sys->i_temporal_ref;
}
else /* General case, use demuxer's dts/pts when set or interpolate */
{
if( p_sys->b_low_delay || p_sys->i_picture_type == 0x03 )
{
/* Trivial case (DTS == PTS) */
/* Correct interpolated dts when we receive a new pts/dts */
if( p_sys->i_pts != VLC_TICK_INVALID )
date_Set( &p_sys->dts, p_sys->i_pts );
if( p_sys->i_dts != VLC_TICK_INVALID )
date_Set( &p_sys->dts, p_sys->i_dts );
}
else
{
/* Correct interpolated dts when we receive a new pts/dts */
if(p_sys->i_last_ref_pts != VLC_TICK_INVALID && !p_sys->b_second_field)
date_Set( &p_sys->dts, p_sys->i_last_ref_pts );
if( p_sys->i_dts != VLC_TICK_INVALID )
date_Set( &p_sys->dts, p_sys->i_dts );
if( !p_sys->b_second_field )
p_sys->i_last_ref_pts = p_sys->i_pts;
}
p_pic->i_dts = date_Get( &p_sys->dts );
/* Set PTS only if we have a B frame or if it comes from the stream */
if( p_sys->i_pts != VLC_TICK_INVALID )
{
p_pic->i_pts = p_sys->i_pts;
}
else if( p_sys->i_picture_type == 0x03 )
{
p_pic->i_pts = p_pic->i_dts;
}
else
{
p_pic->i_pts = VLC_TICK_INVALID;
}
if( date_Get( &p_sys->dts ) != VLC_TICK_INVALID )
{
date_Increment( &p_sys->dts, i_num_fields );
p_pic->i_length = date_Get( &p_sys->dts ) - p_pic->i_dts;
}
}
#if 0
msg_Dbg( p_dec, "pic: type=%d struct=%d ref=%d nf=%d tff=%d dts=%"PRId64" ptsdiff=%"PRId64" len=%"PRId64,
p_sys->i_picture_type, p_sys->i_picture_structure, p_sys->i_temporal_ref, i_num_fields,
p_sys->i_top_field_first,
p_pic->i_dts , (p_pic->i_pts != VLC_TICK_INVALID) ? p_pic->i_pts - p_pic->i_dts : 0, p_pic->i_length );
#endif
/* Reset context */
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
p_sys->b_frame_slice = false;
if( p_sys->i_picture_structure != 0x03 )
{
p_sys->b_second_field = !p_sys->b_second_field;
}
else
{
p_sys->b_second_field = 0;
}
/* CC */
p_sys->b_cc_reset = true;
p_sys->i_cc_pts = p_pic->i_pts;
p_sys->i_cc_dts = p_pic->i_dts;
p_sys->i_cc_flags = p_pic->i_flags & BLOCK_FLAG_TYPE_MASK;
return p_pic;
}
/*****************************************************************************
* Helpers:
*****************************************************************************/
static void PacketizeReset( void *p_private, bool b_flush )
{
VLC_UNUSED(b_flush);
decoder_t *p_dec = p_private;
decoder_sys_t *p_sys = p_dec->p_sys;
p_sys->i_next_block_flags = BLOCK_FLAG_DISCONTINUITY;
if( p_sys->p_frame )
{
block_ChainRelease( p_sys->p_frame );
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
p_sys->b_frame_slice = false;
}
date_Set( &p_sys->dts, VLC_TICK_INVALID );
date_Set( &p_sys->prev_iframe_dts, VLC_TICK_INVALID );
p_sys->i_dts =
p_sys->i_pts =
p_sys->i_last_ref_pts = VLC_TICK_INVALID;
p_sys->b_waiting_iframe = p_sys->b_sync_on_intra_frame;
p_sys->i_prev_temporal_ref = 2048;
}
static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
{
decoder_t *p_dec = p_private;
decoder_sys_t *p_sys = p_dec->p_sys;
/* Check if we have a picture start code */
*pb_ts_used = p_block->p_buffer[3] == PICTURE_STARTCODE;
p_block = ParseMPEGBlock( p_dec, p_block );
if( p_block )
{
p_block->i_flags |= p_sys->i_next_block_flags;
p_sys->i_next_block_flags = 0;
}
else *pb_ts_used = false; /* only clear up if output */
return p_block;
}
static block_t * PacketizeDrain( void *p_private )
{
decoder_t *p_dec = p_private;
decoder_sys_t *p_sys = p_dec->p_sys;
if( p_sys->b_waiting_iframe || !p_sys->b_frame_slice )
return NULL;
block_t *p_out = OutputFrame( p_dec );
if( p_out )
{
p_out->i_flags |= p_sys->i_next_block_flags;
p_sys->i_next_block_flags = 0;
}
return p_out;
}
static int PacketizeValidate( void *p_private, block_t *p_au )
{
decoder_t *p_dec = p_private;
decoder_sys_t *p_sys = p_dec->p_sys;
if( unlikely( p_sys->b_waiting_iframe ) )
{
if( (p_au->i_flags & BLOCK_FLAG_TYPE_I) == 0 )
{
msg_Dbg( p_dec, "waiting on intra frame" );
return VLC_EGENERIC;
}
msg_Dbg( p_dec, "synced on intra frame" );
p_sys->b_waiting_iframe = false;
}
/* We've just started the stream, wait for the first PTS.
* We discard here so we can still get the sequence header. */
if( unlikely( p_sys->i_dts == VLC_TICK_INVALID && p_sys->i_pts == VLC_TICK_INVALID &&
date_Get( &p_sys->dts ) == VLC_TICK_INVALID ))
{
msg_Dbg( p_dec, "need a starting pts/dts" );
return VLC_EGENERIC;
}
/* When starting the stream we can have the first frame with
* an invalid DTS (i_interpolated_pts is initialized to VLC_TICK_INVALID) */
if( unlikely( p_au->i_dts == VLC_TICK_INVALID ) )
p_au->i_dts = p_au->i_pts;
return VLC_SUCCESS;
}
/*****************************************************************************
* ParseMPEGBlock: Re-assemble fragments into a block containing a picture
*****************************************************************************/
static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_pic = NULL;
const enum mpeg_startcode_e startcode = p_frag->p_buffer[3];
/*
* Check if previous picture is finished
*/
if( ( p_sys->b_frame_slice &&
(startcode == PICTURE_STARTCODE || startcode > SLICE_STARTCODE_LAST ) ) &&
p_sys->p_seq == NULL )
{
/* We have a picture but without a sequence header we can't
* do anything */
msg_Dbg( p_dec, "waiting for sequence start" );
if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
p_sys->p_frame = NULL;
p_sys->pp_last = &p_sys->p_frame;
p_sys->b_frame_slice = false;
}
else if( p_sys->b_frame_slice &&
(startcode == PICTURE_STARTCODE || startcode > SLICE_STARTCODE_LAST) )
{
const bool b_eos = startcode == SEQUENCE_END_STARTCODE;
if( b_eos )
{
block_ChainLastAppend( &p_sys->pp_last, p_frag );
p_frag = NULL;
}
p_pic = OutputFrame( p_dec );
if( p_pic && b_eos )
p_pic->i_flags |= BLOCK_FLAG_END_OF_SEQUENCE;
}
if( !p_pic && p_sys->b_cc_reset )
{
p_sys->b_cc_reset = false;
cc_Flush( &p_sys->cc );
}
if( !p_frag )
return p_pic;
/*
* Check info of current fragment
*/
if( startcode == GROUP_STARTCODE )
{
/* Group start code */
unsigned i_fps = p_sys->dts.i_divider_num / (p_sys->dts.i_divider_den << 1);
if( p_sys->p_seq && p_sys->i_seq_old > i_fps )
{
/* Useful for mpeg1: repeat sequence header every second */
const block_t * params[2] = { p_sys->p_seq, p_sys->p_ext };
for( int i=0; i<2; i++ )
{
if( params[i] == NULL )
break;
block_t *p_dup = block_Duplicate( params[i] );
if( p_dup )
block_ChainLastAppend( &p_sys->pp_last, p_dup );
}
p_sys->i_seq_old = 0;
}
}
else if( startcode == SEQUENCE_HEADER_STARTCODE && p_frag->i_buffer >= 11 )
{
/* Sequence header code */
if( p_sys->p_seq ) block_Release( p_sys->p_seq );
if( p_sys->p_ext ) block_Release( p_sys->p_ext );
p_sys->p_seq = block_Duplicate( p_frag );
p_sys->i_seq_old = 0;
p_sys->p_ext = NULL;
p_sys->i_h_size_value = ( p_frag->p_buffer[4] << 4)|(p_frag->p_buffer[5] >> 4 );
p_sys->i_v_size_value = ( (p_frag->p_buffer[5]&0x0f) << 8 )|p_frag->p_buffer[6];
p_sys->i_aspect_ratio_info = p_frag->p_buffer[7] >> 4;
/* TODO: MPEG1 aspect ratio */
p_sys->i_frame_rate_value = p_frag->p_buffer[7] & 0x0f;
p_sys->i_bitratelower18 = (p_frag->p_buffer[ 8] << 12) |
(p_frag->p_buffer[ 9] << 4) |
(p_frag->p_buffer[10] & 0x0F);
}
else if( startcode == EXTENSION_STARTCODE && p_frag->i_buffer > 4 )
{
/* extension_start_code_identifier */
const enum extension_start_code_identifier_e extid = p_frag->p_buffer[4] >> 4;
/* Extension start code */
if( extid == SEQUENCE_EXTENSION_ID )
{
#if 0
static const int mpeg2_aspect[16][2] =
{
{0,1}, {1,1}, {4,3}, {16,9}, {221,100},
{0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1}, {0,1},
{0,1}, {0,1}
};
#endif
/* sequence extension */
if( p_sys->p_ext) block_Release( p_sys->p_ext );
p_sys->p_ext = block_Duplicate( p_frag );
if( p_frag->i_buffer >= 10 )
{
/* profile and level indication */
if( p_dec->fmt_out.i_profile == -1 )
{
const uint16_t profilelevel = ((p_frag->p_buffer[4] << 4) |
(p_frag->p_buffer[5] >> 4)) & 0xFF;
int i_profile = -1;
int i_level = -1;
switch( profilelevel )
{
case 0x82:
i_profile = PROFILE_MPEG2_422;
i_level = LEVEL_MPEG2_HIGH;
break;
case 0x85:
i_profile = PROFILE_MPEG2_422;
i_level = LEVEL_MPEG2_MAIN;
break;
case 0x8A:
i_profile = PROFILE_MPEG2_MULTIVIEW;
i_level = LEVEL_MPEG2_HIGH;
break;
case 0x8B:
i_profile = PROFILE_MPEG2_MULTIVIEW;
i_level = LEVEL_MPEG2_HIGH_1440;
break;
case 0x8D:
i_profile = PROFILE_MPEG2_MULTIVIEW;
i_level = LEVEL_MPEG2_MAIN;
break;
case 0x8E:
i_profile = PROFILE_MPEG2_MULTIVIEW;
i_level = LEVEL_MPEG2_LOW;
break;
default:
if( (profilelevel & 0x80) == 0 ) /* escape bit */
{
i_profile = (profilelevel >> 4) & 0x07;
i_level = profilelevel & 0x0F;
}
break;
}
p_dec->fmt_out.i_profile = i_profile;
p_dec->fmt_out.i_level = i_level;
}
p_sys->b_seq_progressive =
p_frag->p_buffer[5]&0x08 ? true : false;
p_sys->i_h_size_ext = ((p_frag->p_buffer[5] & 0x01) << 1) | (p_frag->p_buffer[6] >> 7);
p_sys->i_v_size_ext = (p_frag->p_buffer[6] >> 5) & 0x03;
p_sys->i_bitrateupper12 = ((p_frag->p_buffer[6] & 0x1F) << 8) | (p_frag->p_buffer[7] >> 1);
p_sys->b_low_delay =
p_frag->p_buffer[9]&0x80 ? true : false;
p_sys->i_frame_rate_ext_n = (p_frag->p_buffer[9] >> 5) & 0x03;
p_sys->i_frame_rate_ext_d = p_frag->p_buffer[9] & 0x1F;
}
/* Do not set aspect ratio : in case we're transcoding,
* transcode will take our fmt_out as a fmt_in to libmpeg2.
* libmpeg2.c will then believe that the user has requested
* a specific aspect ratio, which she hasn't. Thus in case
* of aspect ratio change, we're screwed. --Meuuh
*/
#if 0
p_dec->fmt_out.video.i_sar_num =
mpeg2_aspect[p_sys->i_aspect_ratio_info][0] *
p_dec->fmt_out.video.i_height;
p_dec->fmt_out.video.i_sar_den =
mpeg2_aspect[p_sys->i_aspect_ratio_info][1] *
p_dec->fmt_out.video.i_width;
#endif
}
else if( extid == PICTURE_CODING_EXTENSION_ID && p_frag->i_buffer > 8 )
{
/* picture extension */
p_sys->i_picture_structure = p_frag->p_buffer[6]&0x03;
p_sys->i_top_field_first = p_frag->p_buffer[7] >> 7;
p_sys->i_repeat_first_field= (p_frag->p_buffer[7]>>1)&0x01;
p_sys->i_progressive_frame = p_frag->p_buffer[8] >> 7;
}
else if( extid == SEQUENCE_DISPLAY_EXTENSION_ID && p_frag->i_buffer > 8 )
{
/* Sequence display extension */
bool contains_color_description = (p_frag->p_buffer[4] & 0x01);
//uint8_t video_format = (p_frag->p_buffer[4] & 0x0f) >> 1;
if( contains_color_description && p_frag->i_buffer > 11 )
{
p_dec->fmt_out.video.primaries =
iso_23001_8_cp_to_vlc_primaries( p_frag->p_buffer[5] );
p_dec->fmt_out.video.transfer =
iso_23001_8_tc_to_vlc_xfer( p_frag->p_buffer[6] );
p_dec->fmt_out.video.space =
iso_23001_8_mc_to_vlc_coeffs( p_frag->p_buffer[7] );
}
}
}
else if( startcode == USER_DATA_STARTCODE && p_frag->i_buffer > 8 )
{
/* Frame Packing extension identifier as H262 2012 Amd4 Annex L */
if( !memcmp( &p_frag->p_buffer[4], "JP3D", 4 ) &&
p_frag->i_buffer > 11 && p_frag->p_buffer[8] == 0x03 &&
p_dec->fmt_in->video.multiview_mode == MULTIVIEW_2D )
{
video_multiview_mode_t mode;
switch( p_frag->p_buffer[9] & 0x7F )
{
case 0x03:
mode = MULTIVIEW_STEREO_SBS; break;
case 0x04:
mode = MULTIVIEW_STEREO_TB; break;
case 0x08:
default:
mode = MULTIVIEW_2D; break;
}
p_dec->fmt_out.video.multiview_mode = mode;
}
else
cc_ProbeAndExtract( &p_sys->cc, p_sys->i_top_field_first,
&p_frag->p_buffer[4], p_frag->i_buffer - 4 );
}
else if( startcode == PICTURE_STARTCODE )
{
/* Picture start code */
p_sys->i_seq_old++;
if( p_frag->i_buffer >= 6 )
{
p_sys->i_temporal_ref =
( p_frag->p_buffer[4] << 2 )|(p_frag->p_buffer[5] >> 6);
p_sys->i_picture_type = ( p_frag->p_buffer[5] >> 3 ) & 0x03;
}
/* Check if we can use timestamps */
if(p_frag->i_dts != VLC_TICK_INVALID &&
p_frag->i_dts <= p_sys->i_dts)
{
date_t next = p_sys->dts;
date_Set(&next, p_frag->i_dts);
/* Because the prev timestamp could have been repeated though
* helper, clear up if we are within 2 frames backward */
if(date_Increment(&next, 4) >= p_sys->i_dts)
p_frag->i_dts = p_frag->i_pts = VLC_TICK_INVALID; /* do not reuse */
}
p_sys->i_dts = p_frag->i_dts;
p_sys->i_pts = p_frag->i_pts;
}
else if( startcode >= SLICE_STARTCODE_FIRST &&
startcode <= SLICE_STARTCODE_LAST )
{
/* Slice start code */
p_sys->b_frame_slice = true;
}
/* Append the block */
block_ChainLastAppend( &p_sys->pp_last, p_frag );
return p_pic;
}