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Commit 3a3f44fd authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
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stream: remove caching from stream_access

parent 7bcd0baa
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Showing with 125 additions and 1034 deletions
src/input/stream_access.c
View file @ 3a3f44fd
......@@ -30,362 +30,114 @@
#include <string.h>
#include <vlc_common.h>
#include <vlc_interrupt.h>
#include <libvlc.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;
uint64_t i_start;
uint64_t i_end;
uint8_t *p_buffer;
} stream_track_t;
typedef enum
{
STREAM_METHOD_BLOCK,
STREAM_METHOD_STREAM,
STREAM_METHOD_READDIR
} stream_read_method_t;
struct stream_sys_t
{
access_t *p_access;
stream_read_method_t method; /* method to use */
uint64_t i_pos; /* Current reading offset */
/* Method 1: pf_block */
struct
{
uint64_t i_start; /* Offset of block for p_first */
uint64_t i_offset; /* Offset for data in p_current */
block_t *p_current; /* Current block */
uint64_t i_size; /* Total amount of data in the list */
block_t *p_first;
block_t **pp_last;
} block;
/* Method 2: for pf_read */
struct
{
unsigned 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;
/* */
unsigned i_used; /* Used since last read */
unsigned i_read_size;
} stream;
/* Stat for both method */
struct
{
/* Stat about reading data */
uint64_t i_read_count;
uint64_t i_bytes;
uint64_t i_read_time;
} stat;
access_t *access;
block_t *block;
};
/* Method 1: */
static ssize_t AStreamReadBlock( stream_t *, void *, size_t );
static int AStreamSeekBlock( stream_t *s, uint64_t i_pos );
static void AStreamPrebufferBlock( stream_t *s );
static block_t *AReadBlock( stream_t *s, bool *pb_eof );
/* Method 2 */
static ssize_t AStreamReadStream( stream_t *, void *, size_t );
static int AStreamSeekStream( stream_t *s, uint64_t i_pos );
static void AStreamPrebufferStream( stream_t *s );
static ssize_t AReadStream( stream_t *s, void *p_read, size_t i_read );
/* ReadDir */
static input_item_t *AStreamReadDir( stream_t *s );
/* Common */
static ssize_t AStreamReadError( stream_t *s, void *p_read, size_t i_read )
{
(void) s; (void) p_read; (void) i_read;
return VLC_EGENERIC;
}
static input_item_t * AStreamReadDirError( stream_t *s )
/* Block access */
static ssize_t AStreamReadBlock(stream_t *s, void *buf, size_t len)
{
(void) s;
return NULL;
}
static int AStreamControl( stream_t *s, int i_query, va_list );
static void AStreamDestroy( stream_t *s );
stream_t *stream_AccessNew( access_t *p_access )
{
stream_t *s = stream_CommonNew( VLC_OBJECT(p_access) );
stream_sys_t *p_sys;
if( !s )
return NULL;
s->p_input = p_access->p_input;
if( asprintf( &s->psz_url, "%s://%s", p_access->psz_access,
p_access->psz_location ) == -1 )
s->psz_url = NULL;
s->p_sys = p_sys = malloc( sizeof( *p_sys ) );
if( unlikely(s->psz_url == NULL || s->p_sys == NULL) )
{
free( s->p_sys );
stream_CommonDelete( s );
return NULL;
}
s->pf_read = AStreamReadError; /* Replaced later */
s->pf_readdir = AStreamReadDirError; /* Replaced later */
s->pf_control = AStreamControl;
s->pf_destroy = AStreamDestroy;
/* Common field */
p_sys->p_access = p_access;
assert( p_access->pf_block || p_access->pf_read || p_access->pf_readdir );
if( p_access->pf_block )
p_sys->method = STREAM_METHOD_BLOCK;
else if( p_access->pf_read )
p_sys->method = STREAM_METHOD_STREAM;
else
p_sys->method = STREAM_METHOD_READDIR;
p_sys->i_pos = p_access->info.i_pos;
/* Stats */
p_sys->stat.i_bytes = 0;
p_sys->stat.i_read_time = 0;
p_sys->stat.i_read_count = 0;
stream_sys_t *sys = s->p_sys;
input_thread_t *input = s->p_input;
block_t *block = sys->block;
if( p_sys->method == STREAM_METHOD_BLOCK )
while (block == NULL)
{
msg_Dbg( s, "Using block method for AStream*" );
s->pf_read = AStreamReadBlock;
/* 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 (vlc_access_Eof(sys->access))
return 0;
if (vlc_killed())
return -1;
if( p_sys->block.i_size <= 0 )
{
msg_Err( s, "cannot pre fill buffer" );
goto error;
}
block = vlc_access_Block(sys->access);
}
else if ( p_sys->method == STREAM_METHOD_STREAM )
{
int i;
msg_Dbg( s, "Using stream method for AStream*" );
s->pf_read = AStreamReadStream;
/* 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;
}
}
else
if (input != NULL)
{
msg_Dbg( s, "Using readdir method for AStream*" );
uint64_t total;
assert( p_sys->method == STREAM_METHOD_READDIR );
s->pf_readdir = AStreamReadDir;
vlc_mutex_lock(&input->p->counters.counters_lock);
stats_Update(input->p->counters.p_read_bytes, block->i_buffer, &total);
stats_Update(input->p->counters.p_input_bitrate, total, NULL);
stats_Update(input->p->counters.p_read_packets, 1, NULL);
vlc_mutex_unlock(&input->p->counters.counters_lock);
}
return s;
size_t copy = block->i_buffer < len ? block->i_buffer : len;
error:
if( p_sys->method == STREAM_METHOD_BLOCK )
{
/* Nothing yet */
}
else if( p_sys->method == STREAM_METHOD_STREAM )
{
free( p_sys->stream.p_buffer );
}
free( s->p_sys );
stream_CommonDelete( s );
vlc_access_Delete( p_access );
return NULL;
}
if (likely(copy > 0) && buf != NULL /* skipping data? */)
memcpy(buf, block->p_buffer, copy);
/****************************************************************************
* AStreamDestroy:
****************************************************************************/
static void AStreamDestroy( stream_t *s )
{
stream_sys_t *p_sys = s->p_sys;
block->p_buffer += copy;
block->i_buffer -= copy;
if( p_sys->method == STREAM_METHOD_BLOCK )
block_ChainRelease( p_sys->block.p_first );
else if( p_sys->method == STREAM_METHOD_STREAM )
free( p_sys->stream.p_buffer );
if (block->i_buffer == 0)
block_Release(block);
else
sys->block = block;
stream_CommonDelete( s );
vlc_access_Delete( p_sys->p_access );
free( p_sys );
return copy;
}
/****************************************************************************
* AStreamControlReset:
****************************************************************************/
static void AStreamControlReset( stream_t *s )
/* Read access */
static ssize_t AStreamReadStream(stream_t *s, void *buf, size_t len)
{
stream_sys_t *p_sys = s->p_sys;
p_sys->i_pos = p_sys->p_access->info.i_pos;
stream_sys_t *sys = s->p_sys;
input_thread_t *input = s->p_input;
ssize_t val = 0;
if( p_sys->method == STREAM_METHOD_BLOCK )
do
{
block_ChainRelease( p_sys->block.p_first );
if (vlc_access_Eof(sys->access))
return 0;
if (vlc_killed())
return -1;
/* 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 );
val = vlc_access_Read(sys->access, buf, len);
if (val == 0)
return 0; /* EOF */
}
else
while (val < 0);
if (input != NULL)
{
int i;
uint64_t total;
assert( p_sys->method == STREAM_METHOD_STREAM );
vlc_mutex_lock(&input->p->counters.counters_lock);
stats_Update(input->p->counters.p_read_bytes, val, &total);
stats_Update(input->p->counters.p_input_bitrate, total, NULL);
stats_Update(input->p->counters.p_read_packets, 1, NULL);
vlc_mutex_unlock(&input->p->counters.counters_lock);
}
/* Setup our tracks */
p_sys->stream.i_offset = 0;
p_sys->stream.i_tk = 0;
p_sys->stream.i_used = 0;
return val;
}
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;
}
/* Directory */
static input_item_t *AStreamReadDir(stream_t *s)
{
stream_sys_t *sys = s->p_sys;
/* Do the prebuffering */
AStreamPrebufferStream( s );
}
if (sys->access->pf_readdir == NULL)
return NULL;
return sys->access->pf_readdir(sys->access);
}
/* Common */
#define static_control_match(foo) \
static_assert((unsigned) STREAM_##foo == ACCESS_##foo, "Mismatch")
/****************************************************************************
* AStreamControl:
****************************************************************************/
static int AStreamControl( stream_t *s, int i_query, va_list args )
static int AStreamControl(stream_t *s, int cmd, va_list args)
{
stream_sys_t *p_sys = s->p_sys;
access_t *p_access = p_sys->p_access;
stream_sys_t *sys = s->p_sys;
access_t *access = sys->access;
static_control_match(CAN_SEEK);
static_control_match(CAN_FASTSEEK);
......@@ -406,7 +158,7 @@ static int AStreamControl( stream_t *s, int i_query, va_list args )
static_control_match(SET_PRIVATE_ID_CA);
static_control_match(GET_PRIVATE_ID_STATE);
switch( i_query )
switch (cmd)
{
case STREAM_CAN_SEEK:
case STREAM_CAN_FASTSEEK:
......@@ -421,762 +173,101 @@ static int AStreamControl( stream_t *s, int i_query, va_list args )
case STREAM_GET_CONTENT_TYPE:
case STREAM_GET_SIGNAL:
case STREAM_SET_PAUSE_STATE:
case STREAM_SET_TITLE:
case STREAM_SET_SEEKPOINT:
case STREAM_SET_PRIVATE_ID_STATE:
case STREAM_SET_PRIVATE_ID_CA:
case STREAM_GET_PRIVATE_ID_STATE:
return access_vaControl( p_access, i_query, args );
case STREAM_GET_POSITION:
*va_arg( args, uint64_t * ) = p_sys->i_pos;
break;
case STREAM_SET_POSITION:
{
uint64_t offset = va_arg( args, uint64_t );
switch( p_sys->method )
{
case STREAM_METHOD_BLOCK:
return AStreamSeekBlock( s, offset );
case STREAM_METHOD_STREAM:
return AStreamSeekStream( s, offset );
default:
vlc_assert_unreachable();
return VLC_EGENERIC;
}
}
case STREAM_SET_TITLE:
case STREAM_SET_SEEKPOINT:
{
int ret = access_vaControl( p_access, i_query, args );
if( ret == VLC_SUCCESS )
AStreamControlReset( s );
return ret;
}
return access_vaControl(access, cmd, args);
case STREAM_IS_DIRECTORY:
{
bool *pb_canreaddir = va_arg( args, bool * );
bool *pb_dirsorted = va_arg( args, bool * );
bool *pb_dircanloop = va_arg( args, bool * );
*pb_canreaddir = p_sys->method == STREAM_METHOD_READDIR;
if( pb_dirsorted )
*pb_dirsorted = p_access->info.b_dir_sorted;
if( pb_dircanloop )
*pb_dircanloop = p_access->info.b_dir_can_loop;
return VLC_SUCCESS;
}
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, "starting pre-buffering" );
i_start = mdate();
for( ;; )
{
const int64_t i_date = mdate();
bool b_eof;
block_t *b;
if( vlc_killed() || 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 = ( CLOCK_FREQ * p_sys->stat.i_bytes ) /
(p_sys->stat.i_read_time + 1);
msg_Dbg( s, "prebuffering done %"PRId64" bytes in %"PRId64"s - "
"%"PRId64" KiB/s",
p_sys->stat.i_bytes,
p_sys->stat.i_read_time / CLOCK_FREQ,
i_byterate / 1024 );
bool *b;
*va_arg(args, bool *) = access->pf_readdir != NULL;
b = va_arg(args, bool *);
if (b != NULL)
*b = access->info.b_dir_sorted;
b = va_arg(args, bool *);
if (b != NULL)
*b = access->info.b_dir_can_loop;
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 ssize_t AStreamReadBlock( stream_t *s, void *p_read, size_t i_read )
{
stream_sys_t *p_sys = s->p_sys;
/* It means EOF */
if( p_sys->block.p_current == NULL )
return 0;
if( p_read == NULL )
{
/* seek within this stream if possible, else use plain old read and discard */
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;
}
ssize_t i_current =
p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
size_t i_copy = VLC_CLIP( (size_t)i_current, 0, i_read );
/* Copy data */
if( p_read )
memcpy( p_read,
&p_sys->block.p_current->p_buffer[p_sys->block.i_offset],
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 */
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 == NULL )
AStreamRefillBlock( s );
}
p_sys->i_pos += i_copy;
return i_copy;
}
static int AStreamSeekBlock( stream_t *s, uint64_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 && (uint64_t)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 < (uint64_t)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
case STREAM_GET_POSITION:
{
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 )
{
/* Do the access seek */
if( vlc_access_Seek( p_access, i_pos ) ) return VLC_EGENERIC;
/* 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;
uint64_t *ppos =va_arg(args, uint64_t *);
return VLC_SUCCESS;
}
else
{
do
{
while( p_sys->block.p_current &&
p_sys->i_pos + p_sys->block.p_current->i_buffer - p_sys->block.i_offset <= i_pos )
*ppos = access->info.i_pos;
if (sys->block != NULL)
{
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;
assert(sys->block->i_buffer <= *ppos);
*ppos -= sys->block->i_buffer;
}
if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
{
if( p_sys->i_pos != i_pos )
return VLC_EGENERIC;
}
}
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;
/* 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();
block_t *b;
for( ;; )
{
bool b_eof;
if( vlc_killed() )
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 ssize_t AStreamReadNoSeekStream( stream_t *, void *, size_t );
static ssize_t AStreamReadStream( stream_t *s, void *p_read, size_t i_read )
{
stream_sys_t *p_sys = s->p_sys;
if( !p_read )
{
const uint64_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 AStreamSeekStream( stream_t *s, uint64_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) */
uint64_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++ )
case STREAM_SET_POSITION:
{
stream_track_t *t = &p_sys->stream.tk[i];
uint64_t pos = va_arg(args, uint64_t);
if( !tk || tk->i_date > t->i_date )
if (sys->block != NULL)
{
tk = t;
i_tk_idx = i;
block_Release(sys->block);
sys->block = NULL;
}
return vlc_access_Seek(sys->access, pos);
}
}
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( vlc_access_Seek( p_access, tk->i_end ) )
return VLC_EGENERIC;
}
else if( i_pos > tk->i_end )
{
uint64_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( vlc_access_Seek( p_access, 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 )
default:
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
static ssize_t AStreamReadNoSeekStream( stream_t *s, void *p_read,
size_t i_read )
static void AStreamDestroy(stream_t *s)
{
stream_sys_t *p_sys = s->p_sys;
stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
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
stream_sys_t *sys = s->p_sys;
unsigned i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
size_t i_current =
__MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
STREAM_CACHE_TRACK_SIZE - i_off );
ssize_t i_copy = __MIN( i_current, i_read );
if( i_copy <= 0 )
return 0; /* EOF (or i_read == 0) */
/* Copy data */
/* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
if( p_read )
memcpy( p_read, &tk->p_buffer[i_off], 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 + i_copy <= tk->i_start + p_sys->stream.i_offset + i_read )
{
const size_t i_read_requested = VLC_CLIP( i_read - i_copy,
STREAM_READ_ATONCE / 2,
STREAM_READ_ATONCE * 10 );
if( p_sys->stream.i_used < i_read_requested )
p_sys->stream.i_used = i_read_requested;
AStreamRefillStream( s );
}
return i_copy;
stream_CommonDelete(s);
if (sys->block != NULL)
block_Release(sys->block);
vlc_access_Delete(sys->access);
free(sys);
}
static int AStreamRefillStream( stream_t *s )
stream_t *stream_AccessNew(access_t *access)
{
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( vlc_killed() )
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_start + STREAM_CACHE_TRACK_SIZE < tk->i_end )
{
unsigned 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, "starting 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;
int i_buffered = tk->i_end - tk->i_start;
if( vlc_killed() || i_buffered >= STREAM_CACHE_PREBUFFER_SIZE )
{
int64_t i_byterate;
/* Update stat */
p_sys->stat.i_bytes = i_buffered;
p_sys->stat.i_read_time = i_date - i_start;
i_byterate = ( CLOCK_FREQ * p_sys->stat.i_bytes ) /
(p_sys->stat.i_read_time+1);
msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
"%"PRId64" KiB/s",
p_sys->stat.i_bytes,
p_sys->stat.i_read_time / CLOCK_FREQ,
i_byterate / 1024 );
break;
}
/* */
i_read = STREAM_CACHE_TRACK_SIZE - i_buffered;
i_read = __MIN( (int)p_sys->stream.i_read_size, i_read );
i_read = AReadStream( s, &tk->p_buffer[i_buffered], 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;
stream_t *s = stream_CommonNew(VLC_OBJECT(access));
if (unlikely(s == NULL))
return NULL;
p_sys->stat.i_read_count++;
}
}
s->p_input = access->p_input;
if (asprintf(&s->psz_url, "%s://%s", access->psz_access,
access->psz_location) == -1)
s->psz_url = NULL;
/****************************************************************************
* Access reading/seeking wrappers to handle concatenated streams.
****************************************************************************/
static ssize_t AReadStream( stream_t *s, void *p_read, size_t i_read )
{
stream_sys_t *p_sys = s->p_sys;
input_thread_t *p_input = s->p_input;
stream_sys_t *sys = malloc(sizeof (*sys));
i_read = vlc_access_Read( p_sys->p_access, p_read, i_read );
if( p_input != NULL )
if (unlikely(s->psz_url == NULL || sys == NULL))
{
uint64_t total;
vlc_mutex_lock( &p_input->p->counters.counters_lock );
stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
vlc_mutex_unlock( &p_input->p->counters.counters_lock );
free(sys);
stream_CommonDelete(s);
vlc_access_Delete(access);
return NULL;
}
return i_read;
}
static block_t *AReadBlock( stream_t *s, bool *pb_eof )
{
stream_sys_t *p_sys = s->p_sys;
access_t *p_access = p_sys->p_access;
input_thread_t *p_input = s->p_input;
block_t *p_block = p_access->pf_block( p_access );
if( pb_eof != NULL )
*pb_eof = p_access->info.b_eof;
if( p_input != NULL && p_block != NULL && libvlc_stats (p_access) )
{
uint64_t total;
vlc_mutex_lock( &p_input->p->counters.counters_lock );
stats_Update( p_input->p->counters.p_read_bytes, p_block->i_buffer,
&total );
stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
vlc_mutex_unlock( &p_input->p->counters.counters_lock );
}
return p_block;
}
sys->access = access;
sys->block = NULL;
static input_item_t *AStreamReadDir( stream_t *s )
{
access_t *p_access = s->p_sys->p_access;
s->p_sys = sys;
if (access->pf_block != NULL)
s->pf_read = AStreamReadBlock;
else
s->pf_read = AStreamReadStream;
s->pf_readdir = AStreamReadDir;
s->pf_control = AStreamControl;
s->pf_destroy = AStreamDestroy;
return p_access->pf_readdir( p_access );
return s;
}
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