mirror of https://code.videolan.org/videolan/vlc
225 lines
7.1 KiB
C
225 lines
7.1 KiB
C
/*****************************************************************************
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* mjpeg.c: MPEG packetizer
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*****************************************************************************
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* Copyright (C) 2018 VideoLabs, VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* 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 <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_block.h>
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#include <vlc_codec.h>
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#include <vlc_block_helper.h>
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#include "packetizer_helper.h"
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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typedef struct
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{
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packetizer_t packetizer;
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int i_next_block_flags;
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date_t date;
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} decoder_sys_t;
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static const uint8_t p_mjpg_startcode[4] = { 0xFF, 0xD8, 0xFF, 0xE0 };
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static inline const uint8_t * startcode_Find( const uint8_t *p, const uint8_t *end )
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{
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while( p + 3 < end )
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{
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p = memchr( p, 0xFF, end - p );
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if( !p || end - p < 4 )
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break;
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if( p[1] == 0xD8 && p[2] == 0xFF && (p[3] & 0xE0) == 0xE0 )
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return p;
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p++;
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}
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return NULL;
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}
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/*****************************************************************************
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* Packetize:
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*****************************************************************************/
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static block_t *Packetize( 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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return packetizer_Packetize( &p_sys->packetizer, pp_block );
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}
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static void PacketizeFlush( decoder_t *p_dec )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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date_Set( &p_sys->date, VLC_TICK_INVALID );
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p_sys->i_next_block_flags = BLOCK_FLAG_DISCONTINUITY;
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packetizer_Flush( &p_sys->packetizer );
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}
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/*****************************************************************************
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* Helpers:
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*****************************************************************************/
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static void PacketizeReset( void *p_private, bool b_flush )
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{
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VLC_UNUSED(b_flush);
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decoder_t *p_dec = p_private;
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decoder_sys_t *p_sys = p_dec->p_sys;
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date_Set( &p_sys->date, VLC_TICK_INVALID );
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p_sys->i_next_block_flags = BLOCK_FLAG_DISCONTINUITY;
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}
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static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
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{
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decoder_t *p_dec = p_private;
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decoder_sys_t *p_sys = p_dec->p_sys;
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const uint8_t *p_buf = &p_block->p_buffer[2];
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size_t i_buf = p_block->i_buffer - 2;
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while( i_buf > 4 && p_buf[0] == 0xFF )
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{
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size_t i_size = 2 + GetWBE( &p_buf[2] );
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if( i_size > i_buf )
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break;
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if( p_buf[1] == 0xC0 && i_buf > 9 )
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{
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uint16_t i_height = GetWBE( &p_buf[5] );
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uint16_t i_width = GetWBE( &p_buf[7] );
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if( i_height && i_width &&
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(p_dec->fmt_out.video.i_height != i_height ||
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p_dec->fmt_out.video.i_width != i_width) )
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{
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p_dec->fmt_out.video.i_width =
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p_dec->fmt_out.video.i_visible_width = i_width;
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p_dec->fmt_out.video.i_height =
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p_dec->fmt_out.video.i_visible_height = i_height;
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}
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break;
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}
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i_buf -= i_size;
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p_buf += i_size;
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}
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if( p_block->i_dts == VLC_TICK_INVALID )
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p_block->i_dts = p_block->i_pts;
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else if( p_block->i_pts == VLC_TICK_INVALID )
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p_block->i_pts = p_block->i_dts;
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vlc_tick_t i_prev_dts = date_Get( &p_sys->date );
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if( p_block->i_dts != VLC_TICK_INVALID )
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{
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date_Set( &p_sys->date, p_block->i_dts );
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}
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else if( p_dec->fmt_in->video.i_frame_rate &&
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p_dec->fmt_in->video.i_frame_rate_base )
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{
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date_Increment( &p_sys->date, 1 );
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p_block->i_dts = p_block->i_pts = date_Get( &p_sys->date );
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}
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if( i_prev_dts != VLC_TICK_INVALID && p_block->i_dts != VLC_TICK_INVALID )
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p_block->i_length = p_block->i_dts - i_prev_dts;
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*pb_ts_used = true;
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p_block->i_flags = p_sys->i_next_block_flags | BLOCK_FLAG_TYPE_I;
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p_sys->i_next_block_flags = 0;
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return p_block;
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}
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static int PacketizeValidate( void *p_private, block_t *p_au )
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{
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VLC_UNUSED(p_private);
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VLC_UNUSED(p_au);
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Close:
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*****************************************************************************/
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static void Close( 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 = p_dec->p_sys;
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packetizer_Clean( &p_sys->packetizer );
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free( p_sys );
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}
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/*****************************************************************************
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* Open:
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*****************************************************************************/
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static int Open( 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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if( p_dec->fmt_in->i_codec != VLC_CODEC_MJPG )
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return VLC_EGENERIC;
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p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
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if( !p_dec->p_sys )
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return VLC_ENOMEM;
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p_sys->i_next_block_flags = 0;
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if( p_dec->fmt_in->video.i_frame_rate &&
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p_dec->fmt_in->video.i_frame_rate_base )
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{
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date_Init( &p_sys->date, p_dec->fmt_in->video.i_frame_rate,
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p_dec->fmt_in->video.i_frame_rate_base );
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}
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else
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date_Init( &p_sys->date, 30000, 1001 );
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es_format_Copy( &p_dec->fmt_out, p_dec->fmt_in );
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/* Misc init */
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packetizer_Init( &p_sys->packetizer,
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p_mjpg_startcode, sizeof(p_mjpg_startcode), startcode_Find,
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NULL, 0, 295,
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PacketizeReset, PacketizeParse, PacketizeValidate, NULL,
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p_dec );
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p_dec->pf_packetize = Packetize;
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p_dec->pf_flush = PacketizeFlush;
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p_dec->pf_get_cc = NULL;
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return VLC_SUCCESS;
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}
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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_subcategory( SUBCAT_SOUT_PACKETIZER )
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set_description( N_("MJPEG video packetizer") )
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set_capability( "packetizer", 50 )
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set_callbacks( Open, Close )
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vlc_module_end ()
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