stream.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:56k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * stream.c
- *****************************************************************************
- * Copyright (C) 1999-2004 the VideoLAN team
- * $Id: 8947f2393b8787829bcf414a1d757df8c3e45bba $
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- *
- * 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.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <dirent.h>
- #include <assert.h>
- #include <vlc_common.h>
- #include <vlc_strings.h>
- #include <vlc_osd.h>
- #include <vlc_charset.h>
- #include <libvlc.h>
- #include "access.h"
- #include "stream.h"
- #include "input_internal.h"
- // #define STREAM_DEBUG 1
- /* TODO:
- * - tune the 2 methods (block/stream)
- * - compute cost for seek
- * - improve stream mode seeking with closest segments
- * - ...
- */
- /* Two methods:
- * - using pf_block
- * One linked list of data read
- * - using pf_read
- * More complex scheme using mutliple track to avoid seeking
- * - using directly the access (only indirection for peeking).
- * This method is known to introduce much less latency.
- * It should probably defaulted (instead of the stream method (2)).
- */
- /* How many tracks we have, currently only used for stream mode */
- #ifdef OPTIMIZE_MEMORY
- # define STREAM_CACHE_TRACK 1
- /* Max size of our cache 128Ko per track */
- # define STREAM_CACHE_SIZE (STREAM_CACHE_TRACK*1024*128)
- #else
- # define STREAM_CACHE_TRACK 3
- /* Max size of our cache 4Mo per track */
- # define STREAM_CACHE_SIZE (4*STREAM_CACHE_TRACK*1024*1024)
- #endif
- /* How many data we try to prebuffer
- * XXX it should be small to avoid useless latency but big enough for
- * efficient demux probing */
- #define STREAM_CACHE_PREBUFFER_SIZE (128)
- /* Method1: Simple, for pf_block.
- * We get blocks and put them in the linked list.
- * We release blocks once the total size is bigger than CACHE_BLOCK_SIZE
- */
- /* Method2: A bit more complex, for pf_read
- * - We use ring buffers, only one if unseekable, all if seekable
- * - Upon seek date current ring, then search if one ring match the pos,
- * yes: switch to it, seek the access to match the end of the ring
- * no: search the ring with i_end the closer to i_pos,
- * if close enough, read data and use this ring
- * else use the oldest ring, seek and use it.
- *
- * TODO: - with access non seekable: use all space available for only one ring, but
- * we have to support seekable/non-seekable switch on the fly.
- * - compute a good value for i_read_size
- * - ?
- */
- #define STREAM_READ_ATONCE 1024
- #define STREAM_CACHE_TRACK_SIZE (STREAM_CACHE_SIZE/STREAM_CACHE_TRACK)
- typedef struct
- {
- int64_t i_date;
- int64_t i_start;
- int64_t i_end;
- uint8_t *p_buffer;
- } stream_track_t;
- typedef struct
- {
- char *psz_path;
- int64_t i_size;
- } access_entry_t;
- typedef enum
- {
- STREAM_METHOD_BLOCK,
- STREAM_METHOD_STREAM
- } stream_read_method_t;
- struct stream_sys_t
- {
- access_t *p_access;
- stream_read_method_t method; /* method to use */
- int64_t i_pos; /* Current reading offset */
- /* Method 1: pf_block */
- struct
- {
- int64_t i_start; /* Offset of block for p_first */
- int64_t i_offset; /* Offset for data in p_current */
- block_t *p_current; /* Current block */
- int i_size; /* Total amount of data in the list */
- block_t *p_first;
- block_t **pp_last;
- } block;
- /* Method 2: for pf_read */
- struct
- {
- int i_offset; /* Buffer offset in the current track */
- int i_tk; /* Current track */
- stream_track_t tk[STREAM_CACHE_TRACK];
- /* Global buffer */
- uint8_t *p_buffer;
- /* */
- int i_used; /* Used since last read */
- int i_read_size;
- } stream;
- /* Peek temporary buffer */
- unsigned int i_peek;
- uint8_t *p_peek;
- /* Stat for both method */
- struct
- {
- bool b_fastseek; /* From access */
- /* Stat about reading data */
- int64_t i_read_count;
- int64_t i_bytes;
- int64_t i_read_time;
- /* Stat about seek */
- int i_seek_count;
- int64_t i_seek_time;
- } stat;
- /* Streams list */
- int i_list;
- access_entry_t **list;
- int i_list_index;
- access_t *p_list_access;
- };
- /* Method 1: */
- static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read );
- static int AStreamPeekBlock( stream_t *s, const uint8_t **p_peek, unsigned int i_read );
- static int AStreamSeekBlock( stream_t *s, int64_t i_pos );
- static void AStreamPrebufferBlock( stream_t *s );
- static block_t *AReadBlock( stream_t *s, bool *pb_eof );
- /* Method 2 */
- static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read );
- static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read );
- static int AStreamSeekStream( stream_t *s, int64_t i_pos );
- static void AStreamPrebufferStream( stream_t *s );
- static int AReadStream( stream_t *s, void *p_read, unsigned int i_read );
- /* Common */
- static int AStreamControl( stream_t *s, int i_query, va_list );
- static void AStreamDestroy( stream_t *s );
- static void UStreamDestroy( stream_t *s );
- static int ASeek( stream_t *s, int64_t i_pos );
- /****************************************************************************
- * stream_CommonNew: create an empty stream structure
- ****************************************************************************/
- stream_t *stream_CommonNew( vlc_object_t *p_obj )
- {
- stream_t *s = (stream_t *)vlc_custom_create( p_obj, sizeof(*s),
- VLC_OBJECT_GENERIC, "stream" );
- if( !s )
- return NULL;
- s->p_text = malloc( sizeof(*s->p_text) );
- if( !s->p_text )
- {
- vlc_object_release( s );
- return NULL;
- }
- /* UTF16 and UTF32 text file conversion */
- s->p_text->conv = (vlc_iconv_t)(-1);
- s->p_text->i_char_width = 1;
- s->p_text->b_little_endian = false;
- return s;
- }
- void stream_CommonDelete( stream_t *s )
- {
- if( s->p_text )
- {
- if( s->p_text->conv != (vlc_iconv_t)(-1) )
- vlc_iconv_close( s->p_text->conv );
- free( s->p_text );
- }
- free( s->psz_path );
- vlc_object_release( s );
- }
- /****************************************************************************
- * stream_UrlNew: create a stream from a access
- ****************************************************************************/
- stream_t *__stream_UrlNew( vlc_object_t *p_parent, const char *psz_url )
- {
- const char *psz_access, *psz_demux;
- char *psz_path;
- access_t *p_access;
- stream_t *p_res;
- if( !psz_url )
- return NULL;
- char psz_dup[strlen( psz_url ) + 1];
- strcpy( psz_dup, psz_url );
- input_SplitMRL( &psz_access, &psz_demux, &psz_path, psz_dup );
- /* Now try a real access */
- p_access = access_New( p_parent, psz_access, psz_demux, psz_path );
- if( p_access == NULL )
- {
- msg_Err( p_parent, "no suitable access module for `%s'", psz_url );
- return NULL;
- }
- if( !( p_res = stream_AccessNew( p_access, NULL ) ) )
- {
- access_Delete( p_access );
- return NULL;
- }
- p_res->pf_destroy = UStreamDestroy;
- return p_res;
- }
- stream_t *stream_AccessNew( access_t *p_access, char **ppsz_list )
- {
- stream_t *s = stream_CommonNew( VLC_OBJECT(p_access) );
- stream_sys_t *p_sys;
- if( !s )
- return NULL;
- s->psz_path = strdup( p_access->psz_path );
- s->p_sys = p_sys = malloc( sizeof( *p_sys ) );
- if( !s->psz_path || !s->p_sys )
- {
- stream_CommonDelete( s );
- return NULL;
- }
- /* Attach it now, needed for b_die */
- vlc_object_attach( s, p_access );
- s->pf_read = NULL; /* Set up later */
- s->pf_peek = NULL;
- s->pf_control = AStreamControl;
- s->pf_destroy = AStreamDestroy;
- /* Common field */
- p_sys->p_access = p_access;
- if( p_access->pf_block )
- p_sys->method = STREAM_METHOD_BLOCK;
- else
- p_sys->method = STREAM_METHOD_STREAM;
- p_sys->i_pos = p_access->info.i_pos;
- /* Stats */
- access_Control( p_access, ACCESS_CAN_FASTSEEK, &p_sys->stat.b_fastseek );
- p_sys->stat.i_bytes = 0;
- p_sys->stat.i_read_time = 0;
- p_sys->stat.i_read_count = 0;
- p_sys->stat.i_seek_count = 0;
- p_sys->stat.i_seek_time = 0;
- TAB_INIT( p_sys->i_list, p_sys->list );
- p_sys->i_list_index = 0;
- p_sys->p_list_access = NULL;
- /* Get the additional list of inputs if any (for concatenation) */
- if( ppsz_list && ppsz_list[0] )
- {
- access_entry_t *p_entry = malloc( sizeof(*p_entry) );
- if( !p_entry )
- goto error;
- p_entry->i_size = p_access->info.i_size;
- p_entry->psz_path = strdup( p_access->psz_path );
- if( !p_entry->psz_path )
- {
- free( p_entry );
- goto error;
- }
- p_sys->p_list_access = p_access;
- TAB_APPEND( p_sys->i_list, p_sys->list, p_entry );
- msg_Dbg( p_access, "adding file `%s', (%"PRId64" bytes)",
- p_entry->psz_path, p_access->info.i_size );
- for( int i = 0; ppsz_list[i] != NULL; i++ )
- {
- char *psz_name = strdup( ppsz_list[i] );
- if( !psz_name )
- break;
- access_t *p_tmp = access_New( p_access,
- p_access->psz_access, "", psz_name );
- if( !p_tmp )
- continue;
- msg_Dbg( p_access, "adding file `%s', (%"PRId64" bytes)",
- psz_name, p_tmp->info.i_size );
- p_entry = malloc( sizeof(*p_entry) );
- if( p_entry )
- {
- p_entry->i_size = p_tmp->info.i_size;
- p_entry->psz_path = psz_name;
- TAB_APPEND( p_sys->i_list, p_sys->list, p_entry );
- }
- access_Delete( p_tmp );
- }
- }
- /* Peek */
- p_sys->i_peek = 0;
- p_sys->p_peek = NULL;
- if( p_sys->method == STREAM_METHOD_BLOCK )
- {
- msg_Dbg( s, "Using AStream*Block" );
- s->pf_read = AStreamReadBlock;
- s->pf_peek = AStreamPeekBlock;
- /* Init all fields of p_sys->block */
- p_sys->block.i_start = p_sys->i_pos;
- p_sys->block.i_offset = 0;
- p_sys->block.p_current = NULL;
- p_sys->block.i_size = 0;
- p_sys->block.p_first = NULL;
- p_sys->block.pp_last = &p_sys->block.p_first;
- /* Do the prebuffering */
- AStreamPrebufferBlock( s );
- if( p_sys->block.i_size <= 0 )
- {
- msg_Err( s, "cannot pre fill buffer" );
- goto error;
- }
- }
- else
- {
- int i;
- assert( p_sys->method == STREAM_METHOD_STREAM );
- msg_Dbg( s, "Using AStream*Stream" );
- s->pf_read = AStreamReadStream;
- s->pf_peek = AStreamPeekStream;
- /* Allocate/Setup our tracks */
- p_sys->stream.i_offset = 0;
- p_sys->stream.i_tk = 0;
- p_sys->stream.p_buffer = malloc( STREAM_CACHE_SIZE );
- if( p_sys->stream.p_buffer == NULL )
- goto error;
- p_sys->stream.i_used = 0;
- p_sys->stream.i_read_size = STREAM_READ_ATONCE;
- #if STREAM_READ_ATONCE < 256
- # error "Invalid STREAM_READ_ATONCE value"
- #endif
- for( i = 0; i < STREAM_CACHE_TRACK; i++ )
- {
- p_sys->stream.tk[i].i_date = 0;
- p_sys->stream.tk[i].i_start = p_sys->i_pos;
- p_sys->stream.tk[i].i_end = p_sys->i_pos;
- p_sys->stream.tk[i].p_buffer=
- &p_sys->stream.p_buffer[i * STREAM_CACHE_TRACK_SIZE];
- }
- /* Do the prebuffering */
- AStreamPrebufferStream( s );
- if( p_sys->stream.tk[p_sys->stream.i_tk].i_end <= 0 )
- {
- msg_Err( s, "cannot pre fill buffer" );
- goto error;
- }
- }
- return s;
- error:
- if( p_sys->method == STREAM_METHOD_BLOCK )
- {
- /* Nothing yet */
- }
- else
- {
- free( p_sys->stream.p_buffer );
- }
- while( p_sys->i_list > 0 )
- free( p_sys->list[--(p_sys->i_list)] );
- free( p_sys->list );
- free( s->p_sys );
- vlc_object_detach( s );
- stream_CommonDelete( s );
- return NULL;
- }
- /****************************************************************************
- * AStreamDestroy:
- ****************************************************************************/
- static void AStreamDestroy( stream_t *s )
- {
- stream_sys_t *p_sys = s->p_sys;
- vlc_object_detach( s );
- if( p_sys->method == STREAM_METHOD_BLOCK )
- block_ChainRelease( p_sys->block.p_first );
- else
- free( p_sys->stream.p_buffer );
- free( p_sys->p_peek );
- if( p_sys->p_list_access && p_sys->p_list_access != p_sys->p_access )
- access_Delete( p_sys->p_list_access );
- while( p_sys->i_list-- )
- {
- free( p_sys->list[p_sys->i_list]->psz_path );
- free( p_sys->list[p_sys->i_list] );
- }
- free( p_sys->list );
- free( p_sys );
- stream_CommonDelete( s );
- }
- static void UStreamDestroy( stream_t *s )
- {
- access_t *p_access = (access_t *)s->p_parent;
- AStreamDestroy( s );
- access_Delete( p_access );
- }
- /****************************************************************************
- * AStreamControlReset:
- ****************************************************************************/
- static void AStreamControlReset( stream_t *s )
- {
- stream_sys_t *p_sys = s->p_sys;
- p_sys->i_pos = p_sys->p_access->info.i_pos;
- if( p_sys->method == STREAM_METHOD_BLOCK )
- {
- block_ChainRelease( p_sys->block.p_first );
- /* Init all fields of p_sys->block */
- p_sys->block.i_start = p_sys->i_pos;
- p_sys->block.i_offset = 0;
- p_sys->block.p_current = NULL;
- p_sys->block.i_size = 0;
- p_sys->block.p_first = NULL;
- p_sys->block.pp_last = &p_sys->block.p_first;
- /* Do the prebuffering */
- AStreamPrebufferBlock( s );
- }
- else
- {
- int i;
- assert( p_sys->method == STREAM_METHOD_STREAM );
- /* Setup our tracks */
- p_sys->stream.i_offset = 0;
- p_sys->stream.i_tk = 0;
- p_sys->stream.i_used = 0;
- for( i = 0; i < STREAM_CACHE_TRACK; i++ )
- {
- p_sys->stream.tk[i].i_date = 0;
- p_sys->stream.tk[i].i_start = p_sys->i_pos;
- p_sys->stream.tk[i].i_end = p_sys->i_pos;
- }
- /* Do the prebuffering */
- AStreamPrebufferStream( s );
- }
- }
- /****************************************************************************
- * AStreamControlUpdate:
- ****************************************************************************/
- static void AStreamControlUpdate( stream_t *s )
- {
- stream_sys_t *p_sys = s->p_sys;
- p_sys->i_pos = p_sys->p_access->info.i_pos;
- if( p_sys->i_list )
- {
- int i;
- for( i = 0; i < p_sys->i_list_index; i++ )
- {
- p_sys->i_pos += p_sys->list[i]->i_size;
- }
- }
- }
- /****************************************************************************
- * AStreamControl:
- ****************************************************************************/
- static int AStreamControl( stream_t *s, int i_query, va_list args )
- {
- stream_sys_t *p_sys = s->p_sys;
- access_t *p_access = p_sys->p_access;
- bool *p_bool;
- int64_t *pi_64, i_64;
- int i_int;
- switch( i_query )
- {
- case STREAM_GET_SIZE:
- pi_64 = (int64_t*)va_arg( args, int64_t * );
- if( s->p_sys->i_list )
- {
- int i;
- *pi_64 = 0;
- for( i = 0; i < s->p_sys->i_list; i++ )
- *pi_64 += s->p_sys->list[i]->i_size;
- break;
- }
- *pi_64 = p_access->info.i_size;
- break;
- case STREAM_CAN_SEEK:
- p_bool = (bool*)va_arg( args, bool * );
- access_Control( p_access, ACCESS_CAN_SEEK, p_bool );
- break;
- case STREAM_CAN_FASTSEEK:
- p_bool = (bool*)va_arg( args, bool * );
- access_Control( p_access, ACCESS_CAN_FASTSEEK, p_bool );
- break;
- case STREAM_GET_POSITION:
- pi_64 = (int64_t*)va_arg( args, int64_t * );
- *pi_64 = p_sys->i_pos;
- break;
- case STREAM_SET_POSITION:
- i_64 = (int64_t)va_arg( args, int64_t );
- switch( p_sys->method )
- {
- case STREAM_METHOD_BLOCK:
- return AStreamSeekBlock( s, i_64 );
- case STREAM_METHOD_STREAM:
- return AStreamSeekStream( s, i_64 );
- default:
- assert(0);
- return VLC_EGENERIC;
- }
- case STREAM_CONTROL_ACCESS:
- {
- i_int = (int) va_arg( args, int );
- if( i_int != ACCESS_SET_PRIVATE_ID_STATE &&
- i_int != ACCESS_SET_PRIVATE_ID_CA &&
- i_int != ACCESS_GET_PRIVATE_ID_STATE &&
- i_int != ACCESS_SET_TITLE &&
- i_int != ACCESS_SET_SEEKPOINT )
- {
- msg_Err( s, "Hey, what are you thinking ?"
- "DON'T USE STREAM_CONTROL_ACCESS !!!" );
- return VLC_EGENERIC;
- }
- int i_ret = access_vaControl( p_access, i_int, args );
- if( i_int == ACCESS_SET_TITLE || i_int == ACCESS_SET_SEEKPOINT )
- AStreamControlReset( s );
- return i_ret;
- }
- case STREAM_UPDATE_SIZE:
- AStreamControlUpdate( s );
- return VLC_SUCCESS;
- case STREAM_GET_CONTENT_TYPE:
- return access_Control( p_access, ACCESS_GET_CONTENT_TYPE,
- va_arg( args, char ** ) );
- case STREAM_SET_RECORD_STATE:
- default:
- msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /****************************************************************************
- * Method 1:
- ****************************************************************************/
- static void AStreamPrebufferBlock( stream_t *s )
- {
- stream_sys_t *p_sys = s->p_sys;
- int64_t i_first = 0;
- int64_t i_start;
- msg_Dbg( s, "pre buffering" );
- i_start = mdate();
- for( ;; )
- {
- const int64_t i_date = mdate();
- bool b_eof;
- block_t *b;
- if( s->b_die || p_sys->block.i_size > STREAM_CACHE_PREBUFFER_SIZE )
- {
- int64_t i_byterate;
- /* Update stat */
- p_sys->stat.i_bytes = p_sys->block.i_size;
- p_sys->stat.i_read_time = i_date - i_start;
- i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
- (p_sys->stat.i_read_time + 1);
- msg_Dbg( s, "prebuffering done %"PRId64" bytes in %"PRId64"s - "
- "%"PRId64" kbytes/s",
- p_sys->stat.i_bytes,
- p_sys->stat.i_read_time / INT64_C(1000000),
- i_byterate / 1024 );
- break;
- }
- /* Fetch a block */
- if( ( b = AReadBlock( s, &b_eof ) ) == NULL )
- {
- if( b_eof )
- break;
- continue;
- }
- while( b )
- {
- /* Append the block */
- p_sys->block.i_size += b->i_buffer;
- *p_sys->block.pp_last = b;
- p_sys->block.pp_last = &b->p_next;
- p_sys->stat.i_read_count++;
- b = b->p_next;
- }
- if( i_first == 0 )
- {
- i_first = mdate();
- msg_Dbg( s, "received first data after %d ms",
- (int)((i_first-i_start)/1000) );
- }
- }
- p_sys->block.p_current = p_sys->block.p_first;
- }
- static int AStreamRefillBlock( stream_t *s );
- static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read )
- {
- stream_sys_t *p_sys = s->p_sys;
- uint8_t *p_data = p_read;
- unsigned int i_data = 0;
- /* It means EOF */
- if( p_sys->block.p_current == NULL )
- return 0;
- if( p_data == NULL )
- {
- /* seek within this stream if possible, else use plain old read and discard */
- stream_sys_t *p_sys = s->p_sys;
- access_t *p_access = p_sys->p_access;
- bool b_aseek;
- access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
- if( b_aseek )
- return AStreamSeekBlock( s, p_sys->i_pos + i_read ) ? 0 : i_read;
- }
- while( i_data < i_read )
- {
- int i_current =
- p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
- unsigned int i_copy = __MIN( (unsigned int)__MAX(i_current,0), i_read - i_data);
- /* Copy data */
- if( p_data )
- {
- memcpy( p_data,
- &p_sys->block.p_current->p_buffer[p_sys->block.i_offset],
- i_copy );
- p_data += i_copy;
- }
- i_data += i_copy;
- p_sys->block.i_offset += i_copy;
- if( p_sys->block.i_offset >= p_sys->block.p_current->i_buffer )
- {
- /* Current block is now empty, switch to next */
- if( p_sys->block.p_current )
- {
- p_sys->block.i_offset = 0;
- p_sys->block.p_current = p_sys->block.p_current->p_next;
- }
- /*Get a new block if needed */
- if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
- {
- break;
- }
- }
- }
- p_sys->i_pos += i_data;
- return i_data;
- }
- static int AStreamPeekBlock( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
- {
- stream_sys_t *p_sys = s->p_sys;
- uint8_t *p_data;
- unsigned int i_data = 0;
- block_t *b;
- unsigned int i_offset;
- if( p_sys->block.p_current == NULL ) return 0; /* EOF */
- /* We can directly give a pointer over our buffer */
- if( i_read <= p_sys->block.p_current->i_buffer - p_sys->block.i_offset )
- {
- *pp_peek = &p_sys->block.p_current->p_buffer[p_sys->block.i_offset];
- return i_read;
- }
- /* We need to create a local copy */
- if( p_sys->i_peek < i_read )
- {
- p_sys->p_peek = realloc( p_sys->p_peek, i_read );
- if( !p_sys->p_peek )
- {
- p_sys->i_peek = 0;
- return 0;
- }
- p_sys->i_peek = i_read;
- }
- /* Fill enough data */
- while( p_sys->block.i_size - (p_sys->i_pos - p_sys->block.i_start)
- < i_read )
- {
- block_t **pp_last = p_sys->block.pp_last;
- if( AStreamRefillBlock( s ) ) break;
- /* Our buffer are probably filled enough, don't try anymore */
- if( pp_last == p_sys->block.pp_last ) break;
- }
- /* Copy what we have */
- b = p_sys->block.p_current;
- i_offset = p_sys->block.i_offset;
- p_data = p_sys->p_peek;
- while( b && i_data < i_read )
- {
- unsigned int i_current = __MAX(b->i_buffer - i_offset,0);
- int i_copy = __MIN( i_current, i_read - i_data );
- memcpy( p_data, &b->p_buffer[i_offset], i_copy );
- i_data += i_copy;
- p_data += i_copy;
- i_offset += i_copy;
- if( i_offset >= b->i_buffer )
- {
- i_offset = 0;
- b = b->p_next;
- }
- }
- *pp_peek = p_sys->p_peek;
- return i_data;
- }
- static int AStreamSeekBlock( stream_t *s, int64_t i_pos )
- {
- stream_sys_t *p_sys = s->p_sys;
- access_t *p_access = p_sys->p_access;
- int64_t i_offset = i_pos - p_sys->block.i_start;
- bool b_seek;
- /* We already have thoses data, just update p_current/i_offset */
- if( i_offset >= 0 && i_offset < p_sys->block.i_size )
- {
- block_t *b = p_sys->block.p_first;
- int i_current = 0;
- while( i_current + b->i_buffer < i_offset )
- {
- i_current += b->i_buffer;
- b = b->p_next;
- }
- p_sys->block.p_current = b;
- p_sys->block.i_offset = i_offset - i_current;
- p_sys->i_pos = i_pos;
- return VLC_SUCCESS;
- }
- /* We may need to seek or to read data */
- if( i_offset < 0 )
- {
- bool b_aseek;
- access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
- if( !b_aseek )
- {
- msg_Err( s, "backward seeking impossible (access not seekable)" );
- return VLC_EGENERIC;
- }
- b_seek = true;
- }
- else
- {
- bool b_aseek, b_aseekfast;
- access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
- access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_aseekfast );
- if( !b_aseek )
- {
- b_seek = false;
- msg_Warn( s, "%"PRId64" bytes need to be skipped "
- "(access non seekable)",
- i_offset - p_sys->block.i_size );
- }
- else
- {
- int64_t i_skip = i_offset - p_sys->block.i_size;
- /* Avg bytes per packets */
- int i_avg = p_sys->stat.i_bytes / p_sys->stat.i_read_count;
- /* TODO compute a seek cost instead of fixed threshold */
- int i_th = b_aseekfast ? 1 : 5;
- if( i_skip <= i_th * i_avg &&
- i_skip < STREAM_CACHE_SIZE )
- b_seek = false;
- else
- b_seek = true;
- msg_Dbg( s, "b_seek=%d th*avg=%d skip=%"PRId64,
- b_seek, i_th*i_avg, i_skip );
- }
- }
- if( b_seek )
- {
- int64_t i_start, i_end;
- /* Do the access seek */
- i_start = mdate();
- if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
- i_end = mdate();
- /* Release data */
- block_ChainRelease( p_sys->block.p_first );
- /* Reinit */
- p_sys->block.i_start = p_sys->i_pos = i_pos;
- p_sys->block.i_offset = 0;
- p_sys->block.p_current = NULL;
- p_sys->block.i_size = 0;
- p_sys->block.p_first = NULL;
- p_sys->block.pp_last = &p_sys->block.p_first;
- /* Refill a block */
- if( AStreamRefillBlock( s ) )
- return VLC_EGENERIC;
- /* Update stat */
- p_sys->stat.i_seek_time += i_end - i_start;
- p_sys->stat.i_seek_count++;
- return VLC_SUCCESS;
- }
- else
- {
- do
- {
- /* Read and skip enough data */
- if( AStreamRefillBlock( s ) )
- return VLC_EGENERIC;
- while( p_sys->block.p_current &&
- p_sys->i_pos + p_sys->block.p_current->i_buffer - p_sys->block.i_offset < i_pos )
- {
- p_sys->i_pos += p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
- p_sys->block.p_current = p_sys->block.p_current->p_next;
- p_sys->block.i_offset = 0;
- }
- }
- while( p_sys->block.i_start + p_sys->block.i_size < i_pos );
- p_sys->block.i_offset += i_pos - p_sys->i_pos;
- p_sys->i_pos = i_pos;
- return VLC_SUCCESS;
- }
- return VLC_EGENERIC;
- }
- static int AStreamRefillBlock( stream_t *s )
- {
- stream_sys_t *p_sys = s->p_sys;
- block_t *b;
- /* Release data */
- while( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
- p_sys->block.p_first != p_sys->block.p_current )
- {
- block_t *b = p_sys->block.p_first;
- p_sys->block.i_start += b->i_buffer;
- p_sys->block.i_size -= b->i_buffer;
- p_sys->block.p_first = b->p_next;
- block_Release( b );
- }
- if( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
- p_sys->block.p_current == p_sys->block.p_first &&
- p_sys->block.p_current->p_next ) /* At least 2 packets */
- {
- /* Enough data, don't read more */
- return VLC_SUCCESS;
- }
- /* Now read a new block */
- const int64_t i_start = mdate();
- for( ;; )
- {
- bool b_eof;
- if( s->b_die )
- return VLC_EGENERIC;
- /* Fetch a block */
- if( ( b = AReadBlock( s, &b_eof ) ) )
- break;
- if( b_eof )
- return VLC_EGENERIC;
- }
- p_sys->stat.i_read_time += mdate() - i_start;
- while( b )
- {
- /* Append the block */
- p_sys->block.i_size += b->i_buffer;
- *p_sys->block.pp_last = b;
- p_sys->block.pp_last = &b->p_next;
- /* Fix p_current */
- if( p_sys->block.p_current == NULL )
- p_sys->block.p_current = b;
- /* Update stat */
- p_sys->stat.i_bytes += b->i_buffer;
- p_sys->stat.i_read_count++;
- b = b->p_next;
- }
- return VLC_SUCCESS;
- }
- /****************************************************************************
- * Method 2:
- ****************************************************************************/
- static int AStreamRefillStream( stream_t *s );
- static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read );
- static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read )
- {
- stream_sys_t *p_sys = s->p_sys;
- if( !p_read )
- {
- const int64_t i_pos_wanted = p_sys->i_pos + i_read;
- if( AStreamSeekStream( s, i_pos_wanted ) )
- {
- if( p_sys->i_pos != i_pos_wanted )
- return 0;
- }
- return i_read;
- }
- return AStreamReadNoSeekStream( s, p_read, i_read );
- }
- static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
- {
- stream_sys_t *p_sys = s->p_sys;
- stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
- int64_t i_off;
- if( tk->i_start >= tk->i_end ) return 0; /* EOF */
- #ifdef STREAM_DEBUG
- msg_Dbg( s, "AStreamPeekStream: %d pos=%"PRId64" tk=%d "
- "start=%"PRId64" offset=%d end=%"PRId64,
- i_read, p_sys->i_pos, p_sys->stream.i_tk,
- tk->i_start, p_sys->stream.i_offset, tk->i_end );
- #endif
- /* Avoid problem, but that should *never* happen */
- if( i_read > STREAM_CACHE_TRACK_SIZE / 2 )
- i_read = STREAM_CACHE_TRACK_SIZE / 2;
- while( tk->i_end - tk->i_start - p_sys->stream.i_offset < i_read )
- {
- if( p_sys->stream.i_used <= 1 )
- {
- /* Be sure we will read something */
- p_sys->stream.i_used += i_read -
- (tk->i_end - tk->i_start - p_sys->stream.i_offset);
- }
- if( AStreamRefillStream( s ) ) break;
- }
- if( tk->i_end - tk->i_start - p_sys->stream.i_offset < i_read )
- i_read = tk->i_end - tk->i_start - p_sys->stream.i_offset;
- /* Now, direct pointer or a copy ? */
- i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
- if( i_off + i_read <= STREAM_CACHE_TRACK_SIZE )
- {
- *pp_peek = &tk->p_buffer[i_off];
- return i_read;
- }
- if( p_sys->i_peek < i_read )
- {
- p_sys->p_peek = realloc( p_sys->p_peek, i_read );
- if( !p_sys->p_peek )
- {
- p_sys->i_peek = 0;
- return 0;
- }
- p_sys->i_peek = i_read;
- }
- memcpy( p_sys->p_peek, &tk->p_buffer[i_off],
- STREAM_CACHE_TRACK_SIZE - i_off );
- memcpy( &p_sys->p_peek[STREAM_CACHE_TRACK_SIZE - i_off],
- &tk->p_buffer[0], i_read - (STREAM_CACHE_TRACK_SIZE - i_off) );
- *pp_peek = p_sys->p_peek;
- return i_read;
- }
- static int AStreamSeekStream( stream_t *s, int64_t i_pos )
- {
- stream_sys_t *p_sys = s->p_sys;
- stream_track_t *p_current = &p_sys->stream.tk[p_sys->stream.i_tk];
- access_t *p_access = p_sys->p_access;
- if( p_current->i_start >= p_current->i_end && i_pos >= p_current->i_end )
- return 0; /* EOF */
- #ifdef STREAM_DEBUG
- msg_Dbg( s, "AStreamSeekStream: to %"PRId64" pos=%"PRId64
- " tk=%d start=%"PRId64" offset=%d end=%"PRId64,
- i_pos, p_sys->i_pos, p_sys->stream.i_tk,
- p_current->i_start,
- p_sys->stream.i_offset,
- p_current->i_end );
- #endif
- bool b_aseek;
- access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
- if( !b_aseek && i_pos < p_current->i_start )
- {
- msg_Warn( s, "AStreamSeekStream: can't seek" );
- return VLC_EGENERIC;
- }
- bool b_afastseek;
- access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_afastseek );
- /* FIXME compute seek cost (instead of static 'stupid' value) */
- int64_t i_skip_threshold;
- if( b_aseek )
- i_skip_threshold = b_afastseek ? 128 : 3*p_sys->stream.i_read_size;
- else
- i_skip_threshold = INT64_MAX;
- /* Date the current track */
- p_current->i_date = mdate();
- /* Search a new track slot */
- stream_track_t *tk = NULL;
- int i_tk_idx = -1;
- /* Prefer the current track */
- if( p_current->i_start <= i_pos && i_pos - p_current->i_end <= i_skip_threshold )
- {
- tk = p_current;
- i_tk_idx = p_sys->stream.i_tk;
- }
- if( !tk )
- {
- /* Try to maximize already read data */
- for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
- {
- stream_track_t *t = &p_sys->stream.tk[i];
- if( t->i_start > i_pos || i_pos > t->i_end )
- continue;
- if( !tk || tk->i_end < t->i_end )
- {
- tk = t;
- i_tk_idx = i;
- }
- }
- }
- if( !tk )
- {
- /* Use the oldest unused */
- for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
- {
- stream_track_t *t = &p_sys->stream.tk[i];
- if( !tk || tk->i_date > t->i_date )
- {
- tk = t;
- i_tk_idx = i;
- }
- }
- }
- assert( i_tk_idx >= 0 && i_tk_idx < STREAM_CACHE_TRACK );
- if( tk != p_current )
- i_skip_threshold = 0;
- if( tk->i_start <= i_pos && i_pos - tk->i_end <= i_skip_threshold )
- {
- #ifdef STREAM_DEBUG
- msg_Err( s, "AStreamSeekStream: reusing %d start=%"PRId64
- " end=%"PRId64"(%s)",
- i_tk_idx, tk->i_start, tk->i_end,
- tk != p_current ? "seek" : i_pos > tk->i_end ? "skip" : "noseek" );
- #endif
- if( tk != p_current )
- {
- assert( b_aseek );
- /* Seek at the end of the buffer
- * TODO it is stupid to seek now, it would be better to delay it
- */
- if( ASeek( s, tk->i_end ) )
- return VLC_EGENERIC;
- }
- else
- {
- int64_t i_skip = i_pos - tk->i_end;
- while( i_skip > 0 )
- {
- const int i_read_max = __MIN( 10 * STREAM_READ_ATONCE, i_skip );
- if( AStreamReadNoSeekStream( s, NULL, i_read_max ) != i_read_max )
- return VLC_EGENERIC;
- i_skip -= i_read_max;
- }
- }
- }
- else
- {
- #ifdef STREAM_DEBUG
- msg_Err( s, "AStreamSeekStream: hard seek" );
- #endif
- /* Nothing good, seek and choose oldest segment */
- if( ASeek( s, i_pos ) )
- return VLC_EGENERIC;
- tk->i_start = i_pos;
- tk->i_end = i_pos;
- }
- p_sys->stream.i_offset = i_pos - tk->i_start;
- p_sys->stream.i_tk = i_tk_idx;
- p_sys->i_pos = i_pos;
- /* If there is not enough data left in the track, refill */
- /* TODO How to get a correct value for
- * - refilling threshold
- * - how much to refill
- */
- if( (tk->i_end - tk->i_start) - p_sys->stream.i_offset < p_sys->stream.i_read_size )
- {
- if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
- p_sys->stream.i_used = STREAM_READ_ATONCE / 2;
- if( AStreamRefillStream( s ) && i_pos == tk->i_end )
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read )
- {
- stream_sys_t *p_sys = s->p_sys;
- stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
- uint8_t *p_data = (uint8_t *)p_read;
- unsigned int i_data = 0;
- if( tk->i_start >= tk->i_end )
- return 0; /* EOF */
- #ifdef STREAM_DEBUG
- msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64
- " offset=%d end=%"PRId64,
- i_read, p_sys->i_pos, p_sys->stream.i_tk,
- tk->i_start, p_sys->stream.i_offset, tk->i_end );
- #endif
- while( i_data < i_read )
- {
- int i_off = (tk->i_start + p_sys->stream.i_offset) %
- STREAM_CACHE_TRACK_SIZE;
- unsigned int i_current =
- __MAX(0,__MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
- STREAM_CACHE_TRACK_SIZE - i_off ));
- int i_copy = __MIN( i_current, i_read - i_data );
- if( i_copy <= 0 ) break; /* EOF */
- /* Copy data */
- /* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
- if( p_data )
- {
- memcpy( p_data, &tk->p_buffer[i_off], i_copy );
- p_data += i_copy;
- }
- i_data += i_copy;
- p_sys->stream.i_offset += i_copy;
- /* Update pos now */
- p_sys->i_pos += i_copy;
- /* */
- p_sys->stream.i_used += i_copy;
- if( tk->i_end - tk->i_start - p_sys->stream.i_offset <= i_read -i_data )
- {
- const int i_read_requested = __MAX( __MIN( i_read - i_data,
- STREAM_READ_ATONCE * 10 ),
- STREAM_READ_ATONCE / 2 );
- if( p_sys->stream.i_used < i_read_requested )
- p_sys->stream.i_used = i_read_requested;
- if( AStreamRefillStream( s ) )
- {
- /* EOF */
- if( tk->i_start >= tk->i_end ) break;
- }
- }
- }
- return i_data;
- }
- static int AStreamRefillStream( stream_t *s )
- {
- stream_sys_t *p_sys = s->p_sys;
- stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
- /* We read but won't increase i_start after initial start + offset */
- int i_toread =
- __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE -
- (tk->i_end - tk->i_start - p_sys->stream.i_offset) );
- bool b_read = false;
- int64_t i_start, i_stop;
- if( i_toread <= 0 ) return VLC_EGENERIC; /* EOF */
- #ifdef STREAM_DEBUG
- msg_Dbg( s, "AStreamRefillStream: used=%d toread=%d",
- p_sys->stream.i_used, i_toread );
- #endif
- i_start = mdate();
- while( i_toread > 0 )
- {
- int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
- int i_read;
- if( s->b_die )
- return VLC_EGENERIC;
- i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
- i_read = AReadStream( s, &tk->p_buffer[i_off], i_read );
- /* msg_Dbg( s, "AStreamRefillStream: read=%d", i_read ); */
- if( i_read < 0 )
- {
- continue;
- }
- else if( i_read == 0 )
- {
- if( !b_read )
- return VLC_EGENERIC;
- return VLC_SUCCESS;
- }
- b_read = true;
- /* Update end */
- tk->i_end += i_read;
- /* Windows of STREAM_CACHE_TRACK_SIZE */
- if( tk->i_end - tk->i_start > STREAM_CACHE_TRACK_SIZE )
- {
- int i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;
- tk->i_start += i_invalid;
- p_sys->stream.i_offset -= i_invalid;
- }
- i_toread -= i_read;
- p_sys->stream.i_used -= i_read;
- p_sys->stat.i_bytes += i_read;
- p_sys->stat.i_read_count++;
- }
- i_stop = mdate();
- p_sys->stat.i_read_time += i_stop - i_start;
- return VLC_SUCCESS;
- }
- static void AStreamPrebufferStream( stream_t *s )
- {
- stream_sys_t *p_sys = s->p_sys;
- int64_t i_first = 0;
- int64_t i_start;
- msg_Dbg( s, "pre buffering" );
- i_start = mdate();
- for( ;; )
- {
- stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
- int64_t i_date = mdate();
- int i_read;
- if( s->b_die || tk->i_end >= STREAM_CACHE_PREBUFFER_SIZE )
- {
- int64_t i_byterate;
- /* Update stat */
- p_sys->stat.i_bytes = tk->i_end - tk->i_start;
- p_sys->stat.i_read_time = i_date - i_start;
- i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
- (p_sys->stat.i_read_time+1);
- msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
- "%"PRId64" kbytes/s",
- p_sys->stat.i_bytes,
- p_sys->stat.i_read_time / INT64_C(1000000),
- i_byterate / 1024 );
- break;
- }
- /* */
- i_read = STREAM_CACHE_TRACK_SIZE - tk->i_end;
- i_read = __MIN( p_sys->stream.i_read_size, i_read );
- i_read = AReadStream( s, &tk->p_buffer[tk->i_end], i_read );
- if( i_read < 0 )
- continue;
- else if( i_read == 0 )
- break; /* EOF */
- if( i_first == 0 )
- {
- i_first = mdate();
- msg_Dbg( s, "received first data after %d ms",
- (int)((i_first-i_start)/1000) );
- }
- tk->i_end += i_read;
- p_sys->stat.i_read_count++;
- }
- }
- /****************************************************************************
- * stream_ReadLine:
- ****************************************************************************/
- /**
- * Read from the stream untill first newline.
- * param s Stream handle to read from
- * return A pointer to the allocated output string. You need to free this when you are done.
- */
- #define STREAM_PROBE_LINE 2048
- #define STREAM_LINE_MAX (2048*100)
- char *stream_ReadLine( stream_t *s )
- {
- char *p_line = NULL;
- int i_line = 0, i_read = 0;
- while( i_read < STREAM_LINE_MAX )
- {
- char *psz_eol;
- const uint8_t *p_data;
- int i_data;
- int64_t i_pos;
- /* Probe new data */
- i_data = stream_Peek( s, &p_data, STREAM_PROBE_LINE );
- if( i_data <= 0 ) break; /* No more data */
- /* BOM detection */
- i_pos = stream_Tell( s );
- if( i_pos == 0 && i_data >= 3 )
- {
- int i_bom_size = 0;
- const char *psz_encoding = NULL;
- if( !memcmp( p_data, "xEFxBBxBF", 3 ) )
- {
- psz_encoding = "UTF-8";
- i_bom_size = 3;
- }
- else if( !memcmp( p_data, "xFFxFE", 2 ) )
- {
- psz_encoding = "UTF-16LE";
- s->p_text->b_little_endian = true;
- s->p_text->i_char_width = 2;
- i_bom_size = 2;
- }
- else if( !memcmp( p_data, "xFExFF", 2 ) )
- {
- psz_encoding = "UTF-16BE";
- s->p_text->i_char_width = 2;
- i_bom_size = 2;
- }
- /* Seek past the BOM */
- if( i_bom_size )
- {
- stream_Seek( s, i_bom_size );
- p_data += i_bom_size;
- i_data -= i_bom_size;
- }
- /* Open the converter if we need it */
- if( psz_encoding != NULL )
- {
- msg_Dbg( s, "%s BOM detected", psz_encoding );
- if( s->p_text->i_char_width > 1 )
- {
- s->p_text->conv = vlc_iconv_open( "UTF-8", psz_encoding );
- if( s->p_text->conv == (vlc_iconv_t)-1 )
- {
- msg_Err( s, "iconv_open failed" );
- }
- }
- /* FIXME that's UGLY */
- input_thread_t *p_input;
- p_input = (input_thread_t *)vlc_object_find( s, VLC_OBJECT_INPUT, FIND_PARENT );
- if( p_input != NULL)
- {
- var_Create( p_input, "subsdec-encoding", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
- var_SetString( p_input, "subsdec-encoding", "UTF-8" );
- vlc_object_release( p_input );
- }
- }
- }
- if( i_data % s->p_text->i_char_width )
- {
- /* keep i_char_width boundary */
- i_data = i_data - ( i_data % s->p_text->i_char_width );
- msg_Warn( s, "the read is not i_char_width compatible");
- }
- if( i_data == 0 )
- break;
- /* Check if there is an EOL */
- if( s->p_text->i_char_width == 1 )
- {
- /* UTF-8: 0A <LF> */
- psz_eol = memchr( p_data, 'n', i_data );
- }
- else
- {
- const uint8_t *p = p_data;
- const uint8_t *p_last = p + i_data - s->p_text->i_char_width;
- if( s->p_text->i_char_width == 2 )
- {
- if( s->p_text->b_little_endian == true)
- {
- /* UTF-16LE: 0A 00 <LF> */
- while( p <= p_last && ( p[0] != 0x0A || p[1] != 0x00 ) )
- p += 2;
- }
- else
- {
- /* UTF-16BE: 00 0A <LF> */
- while( p <= p_last && ( p[1] != 0x0A || p[0] != 0x00 ) )
- p += 2;
- }
- }
- if( p > p_last )
- {
- psz_eol = NULL;
- }
- else
- {
- psz_eol = (char *)p + ( s->p_text->i_char_width - 1 );
- }
- }
- if( psz_eol )
- {
- i_data = (psz_eol - (char *)p_data) + 1;
- p_line = realloc( p_line, i_line + i_data + s->p_text->i_char_width ); /* add