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gstreamer/plugins/elements/gstdownloadbuffer.c
Alicia Boya García b50abd9f4e downloadbuffer: Check for flush after seek 
In gst_download_buffer_wait_for_data(), when a seek is made with
perform_seek_to_offset() the `qlock` is released temporarily. Therefore,
the flushing condition can be set during this period and should be
checked.

This was not being checked before, causing occasional deadlocks when
GST_DOWNLOAD_BUFFER_WAIT_ADD_CHECK() was called.

GST_DOWNLOAD_BUFFER_WAIT_ADD_CHECK() assumes that the caller has already
checked that we're not flushing before, since this is done when
acquiring the lock; so if we release it temporarily somewhere, we need
to check for flush again.

Without that check, the function would keep waiting for the condition
variable to be notified before checking for flushing condition again,
and that may very well never happen. This was reproduced when during pad
deactivation when running WebKit in gdb.
2019-07-22 15:06:20 +00:00

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/* GStreamer
* Copyright (C) 2014 Wim Taymans <wim.taymans@gmail.com>
*
* gstdownloadbuffer.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-downloadbuffer
* @title: downloadbuffer
*
* The downloadbuffer element provides on-disk buffering and caching of, typically,
* a network file. temp-template should be set to a value such as
* /tmp/gstreamer-XXXXXX and the element will allocate a random free filename and
* buffer the data in the file.
*
* With max-size-bytes and max-size-time you can configure the buffering limits.
* The downloadbuffer element will try to read-ahead these amounts of data. When
* the amount of read-ahead data drops below low-percent of the configured max,
* the element will start emitting BUFFERING messages until high-percent of max is
* reached again.
*
* The downloadbuffer provides push and pull based scheduling on its source pad
* and will efficiently seek in the upstream element when needed.
*
* The temp-location property will be used to notify the application of the
* allocated filename.
*
* When the downloadbuffer has completely downloaded the media, it will
* post an application message named `GstCacheDownloadComplete`
* with the following information:
*
* * G_TYPE_STRING `location`: the location of the completely downloaded file.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstdownloadbuffer.h"
#include <glib/gstdio.h>
#include "gst/gst-i18n-lib.h"
#include "gst/glib-compat-private.h"
#include <string.h>
#ifdef G_OS_WIN32
#include <io.h> /* lseek, open, close, read */
#undef lseek
#define lseek _lseeki64
#else
#include <unistd.h>
#endif
#ifdef __BIONIC__
#include <fcntl.h>
#endif
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (downloadbuffer_debug);
#define GST_CAT_DEFAULT (downloadbuffer_debug)
enum
{
LAST_SIGNAL
};
/* other defines */
#define DEFAULT_BUFFER_SIZE 4096
/* default property values */
#define DEFAULT_MAX_SIZE_BYTES (2 * 1024 * 1024) /* 2 MB */
#define DEFAULT_MAX_SIZE_TIME 2 * GST_SECOND /* 2 seconds */
#define DEFAULT_LOW_PERCENT 10
#define DEFAULT_HIGH_PERCENT 99
#define DEFAULT_TEMP_REMOVE TRUE
enum
{
PROP_0,
PROP_MAX_SIZE_BYTES,
PROP_MAX_SIZE_TIME,
PROP_LOW_PERCENT,
PROP_HIGH_PERCENT,
PROP_TEMP_TEMPLATE,
PROP_TEMP_LOCATION,
PROP_TEMP_REMOVE,
PROP_LAST
};
#define GST_DOWNLOAD_BUFFER_CLEAR_LEVEL(l) G_STMT_START { \
l.bytes = 0; \
l.time = 0; \
} G_STMT_END
#define STATUS(elem, pad, msg) \
GST_LOG_OBJECT (elem, "(%s:%s) " msg ": %u of %u " \
"bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
" ns", \
GST_DEBUG_PAD_NAME (pad), \
elem->cur_level.bytes, \
elem->max_level.bytes, \
elem->cur_level.time, \
elem->max_level.time)
#define GST_DOWNLOAD_BUFFER_MUTEX_LOCK(q) G_STMT_START { \
g_mutex_lock (&q->qlock); \
} G_STMT_END
#define GST_DOWNLOAD_BUFFER_MUTEX_LOCK_CHECK(q,res,label) G_STMT_START { \
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (q); \
if (res != GST_FLOW_OK) \
goto label; \
} G_STMT_END
#define GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK(q) G_STMT_START { \
g_mutex_unlock (&q->qlock); \
} G_STMT_END
#define GST_DOWNLOAD_BUFFER_WAIT_ADD_CHECK(q, res, o, label) G_STMT_START { \
STATUS (q, q->srcpad, "wait for ADD"); \
q->waiting_add = TRUE; \
q->waiting_offset = o; \
g_cond_wait (&q->item_add, &q->qlock); \
q->waiting_add = FALSE; \
if (res != GST_FLOW_OK) { \
STATUS (q, q->srcpad, "received ADD wakeup"); \
goto label; \
} \
STATUS (q, q->srcpad, "received ADD"); \
} G_STMT_END
#define GST_DOWNLOAD_BUFFER_SIGNAL_ADD(q, o) G_STMT_START { \
if (q->waiting_add && q->waiting_offset <= o) { \
STATUS (q, q->sinkpad, "signal ADD"); \
g_cond_signal (&q->item_add); \
} \
} G_STMT_END
#define _do_init \
GST_DEBUG_CATEGORY_INIT (downloadbuffer_debug, "downloadbuffer", 0, \
"downloadbuffer element");
#define gst_download_buffer_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstDownloadBuffer, gst_download_buffer,
GST_TYPE_ELEMENT, _do_init);
static GstMessage *update_buffering (GstDownloadBuffer * dlbuf);
static void gst_download_buffer_finalize (GObject * object);
static void gst_download_buffer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_download_buffer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_download_buffer_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static void gst_download_buffer_loop (GstPad * pad);
static gboolean gst_download_buffer_handle_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_download_buffer_handle_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static gboolean gst_download_buffer_handle_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_download_buffer_handle_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static gboolean gst_download_buffer_handle_query (GstElement * element,
GstQuery * query);
static GstFlowReturn gst_download_buffer_get_range (GstPad * pad,
GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
static gboolean gst_download_buffer_src_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static gboolean gst_download_buffer_sink_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static GstStateChangeReturn gst_download_buffer_change_state (GstElement *
element, GstStateChange transition);
/* static guint gst_download_buffer_signals[LAST_SIGNAL] = { 0 }; */
static void
gst_download_buffer_class_init (GstDownloadBufferClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_download_buffer_set_property;
gobject_class->get_property = gst_download_buffer_get_property;
/* properties */
g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BYTES,
g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
"Max. amount of data to buffer (bytes, 0=disable)",
0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES,
G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
"Max. amount of data to buffer (in ns, 0=disable)", 0, G_MAXUINT64,
DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_LOW_PERCENT,
g_param_spec_int ("low-percent", "Low percent",
"Low threshold for buffering to start. Only used if use-buffering is True",
0, 100, DEFAULT_LOW_PERCENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_HIGH_PERCENT,
g_param_spec_int ("high-percent", "High percent",
"High threshold for buffering to finish. Only used if use-buffering is True",
0, 100, DEFAULT_HIGH_PERCENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TEMP_TEMPLATE,
g_param_spec_string ("temp-template", "Temporary File Template",
"File template to store temporary files in, should contain directory "
"and XXXXXX. (NULL == disabled)",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TEMP_LOCATION,
g_param_spec_string ("temp-location", "Temporary File Location",
"Location to store temporary files in (Only read this property, "
"use temp-template to configure the name template)",
NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/**
* GstDownloadBuffer:temp-remove
*
* When temp-template is set, remove the temporary file when going to READY.
*/
g_object_class_install_property (gobject_class, PROP_TEMP_REMOVE,
g_param_spec_boolean ("temp-remove", "Remove the Temporary File",
"Remove the temp-location after use",
DEFAULT_TEMP_REMOVE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* set several parent class virtual functions */
gobject_class->finalize = gst_download_buffer_finalize;
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_set_static_metadata (gstelement_class, "DownloadBuffer",
"Generic", "Download Buffer element",
"Wim Taymans <wim.taymans@gmail.com>");
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_download_buffer_change_state);
gstelement_class->query =
GST_DEBUG_FUNCPTR (gst_download_buffer_handle_query);
}
static void
gst_download_buffer_init (GstDownloadBuffer * dlbuf)
{
dlbuf->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
gst_pad_set_chain_function (dlbuf->sinkpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_chain));
gst_pad_set_activatemode_function (dlbuf->sinkpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_sink_activate_mode));
gst_pad_set_event_function (dlbuf->sinkpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_handle_sink_event));
gst_pad_set_query_function (dlbuf->sinkpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_handle_sink_query));
GST_PAD_SET_PROXY_CAPS (dlbuf->sinkpad);
gst_element_add_pad (GST_ELEMENT (dlbuf), dlbuf->sinkpad);
dlbuf->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
gst_pad_set_activatemode_function (dlbuf->srcpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_src_activate_mode));
gst_pad_set_getrange_function (dlbuf->srcpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_get_range));
gst_pad_set_event_function (dlbuf->srcpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_handle_src_event));
gst_pad_set_query_function (dlbuf->srcpad,
GST_DEBUG_FUNCPTR (gst_download_buffer_handle_src_query));
GST_PAD_SET_PROXY_CAPS (dlbuf->srcpad);
gst_element_add_pad (GST_ELEMENT (dlbuf), dlbuf->srcpad);
/* levels */
GST_DOWNLOAD_BUFFER_CLEAR_LEVEL (dlbuf->cur_level);
dlbuf->max_level.bytes = DEFAULT_MAX_SIZE_BYTES;
dlbuf->max_level.time = DEFAULT_MAX_SIZE_TIME;
dlbuf->low_percent = DEFAULT_LOW_PERCENT;
dlbuf->high_percent = DEFAULT_HIGH_PERCENT;
dlbuf->srcresult = GST_FLOW_FLUSHING;
dlbuf->sinkresult = GST_FLOW_FLUSHING;
dlbuf->in_timer = g_timer_new ();
dlbuf->out_timer = g_timer_new ();
g_mutex_init (&dlbuf->qlock);
dlbuf->waiting_add = FALSE;
g_cond_init (&dlbuf->item_add);
/* tempfile related */
dlbuf->temp_template = NULL;
dlbuf->temp_location = NULL;
dlbuf->temp_remove = DEFAULT_TEMP_REMOVE;
}
/* called only once, as opposed to dispose */
static void
gst_download_buffer_finalize (GObject * object)
{
GstDownloadBuffer *dlbuf = GST_DOWNLOAD_BUFFER (object);
g_mutex_clear (&dlbuf->qlock);
g_cond_clear (&dlbuf->item_add);
g_timer_destroy (dlbuf->in_timer);
g_timer_destroy (dlbuf->out_timer);
/* temp_file path cleanup */
g_free (dlbuf->temp_template);
g_free (dlbuf->temp_location);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
reset_positions (GstDownloadBuffer * dlbuf)
{
dlbuf->write_pos = 0;
dlbuf->read_pos = 0;
dlbuf->filling = TRUE;
dlbuf->buffering_percent = 0;
dlbuf->is_buffering = TRUE;
dlbuf->seeking = FALSE;
GST_DOWNLOAD_BUFFER_CLEAR_LEVEL (dlbuf->cur_level);
}
static void
reset_rate_timer (GstDownloadBuffer * dlbuf)
{
dlbuf->bytes_in = 0;
dlbuf->bytes_out = 0;
dlbuf->byte_in_rate = 0.0;
dlbuf->byte_in_period = 0;
dlbuf->byte_out_rate = 0.0;
dlbuf->last_in_elapsed = 0.0;
dlbuf->last_out_elapsed = 0.0;
dlbuf->in_timer_started = FALSE;
dlbuf->out_timer_started = FALSE;
}
/* the interval in seconds to recalculate the rate */
#define RATE_INTERVAL 0.2
/* Tuning for rate estimation. We use a large window for the input rate because
* it should be stable when connected to a network. The output rate is less
* stable (the elements preroll, queues behind a demuxer fill, ...) and should
* therefore adapt more quickly.
* However, initial input rate may be subject to a burst, and should therefore
* initially also adapt more quickly to changes, and only later on give higher
* weight to previous values. */
#define AVG_IN(avg,val,w1,w2) ((avg) * (w1) + (val) * (w2)) / ((w1) + (w2))
#define AVG_OUT(avg,val) ((avg) * 3.0 + (val)) / 4.0
static void
update_levels (GstDownloadBuffer * dlbuf, guint bytes)
{
dlbuf->cur_level.bytes = bytes;
if (dlbuf->byte_in_rate > 0.0) {
dlbuf->cur_level.time =
dlbuf->cur_level.bytes / dlbuf->byte_in_rate * GST_SECOND;
}
GST_DEBUG ("levels: bytes %u/%u, time %" GST_TIME_FORMAT "/%" GST_TIME_FORMAT,
dlbuf->cur_level.bytes, dlbuf->max_level.bytes,
GST_TIME_ARGS (dlbuf->cur_level.time),
GST_TIME_ARGS (dlbuf->max_level.time));
}
static void
update_in_rates (GstDownloadBuffer * dlbuf)
{
gdouble elapsed, period;
gdouble byte_in_rate;
if (!dlbuf->in_timer_started) {
dlbuf->in_timer_started = TRUE;
g_timer_start (dlbuf->in_timer);
return;
}
elapsed = g_timer_elapsed (dlbuf->in_timer, NULL);
/* recalc after each interval. */
if (dlbuf->last_in_elapsed + RATE_INTERVAL < elapsed) {
period = elapsed - dlbuf->last_in_elapsed;
GST_DEBUG_OBJECT (dlbuf,
"rates: period %f, in %" G_GUINT64_FORMAT ", global period %f",
period, dlbuf->bytes_in, dlbuf->byte_in_period);
byte_in_rate = dlbuf->bytes_in / period;
if (dlbuf->byte_in_rate == 0.0)
dlbuf->byte_in_rate = byte_in_rate;
else
dlbuf->byte_in_rate = AVG_IN (dlbuf->byte_in_rate, byte_in_rate,
(double) dlbuf->byte_in_period, period);
/* another data point, cap at 16 for long time running average */
if (dlbuf->byte_in_period < 16 * RATE_INTERVAL)
dlbuf->byte_in_period += period;
/* reset the values to calculate rate over the next interval */
dlbuf->last_in_elapsed = elapsed;
dlbuf->bytes_in = 0;
GST_DEBUG_OBJECT (dlbuf, "rates: in %f", dlbuf->byte_in_rate);
}
}
static void
update_out_rates (GstDownloadBuffer * dlbuf)
{
gdouble elapsed, period;
gdouble byte_out_rate;
if (!dlbuf->out_timer_started) {
dlbuf->out_timer_started = TRUE;
g_timer_start (dlbuf->out_timer);
return;
}
elapsed = g_timer_elapsed (dlbuf->out_timer, NULL);
/* recalc after each interval. */
if (dlbuf->last_out_elapsed + RATE_INTERVAL < elapsed) {
period = elapsed - dlbuf->last_out_elapsed;
GST_DEBUG_OBJECT (dlbuf,
"rates: period %f, out %" G_GUINT64_FORMAT, period, dlbuf->bytes_out);
byte_out_rate = dlbuf->bytes_out / period;
if (dlbuf->byte_out_rate == 0.0)
dlbuf->byte_out_rate = byte_out_rate;
else
dlbuf->byte_out_rate = AVG_OUT (dlbuf->byte_out_rate, byte_out_rate);
/* reset the values to calculate rate over the next interval */
dlbuf->last_out_elapsed = elapsed;
dlbuf->bytes_out = 0;
GST_DEBUG_OBJECT (dlbuf, "rates: out %f", dlbuf->byte_out_rate);
}
}
static gboolean
get_buffering_percent (GstDownloadBuffer * dlbuf, gboolean * is_buffering,
gint * percent)
{
gint perc;
if (dlbuf->high_percent <= 0) {
if (percent)
*percent = 100;
if (is_buffering)
*is_buffering = FALSE;
return FALSE;
}
/* Ensure the variables used to calculate buffering state are up-to-date. */
update_in_rates (dlbuf);
update_out_rates (dlbuf);
/* figure out the percent we are filled, we take the max of all formats. */
if (dlbuf->max_level.bytes > 0) {
if (dlbuf->cur_level.bytes >= dlbuf->max_level.bytes)
perc = 100;
else
perc = dlbuf->cur_level.bytes * 100 / dlbuf->max_level.bytes;
} else
perc = 0;
if (dlbuf->max_level.time > 0) {
if (dlbuf->cur_level.time >= dlbuf->max_level.time)
perc = 100;
else
perc = MAX (perc, dlbuf->cur_level.time * 100 / dlbuf->max_level.time);
} else
perc = MAX (0, perc);
if (is_buffering)
*is_buffering = dlbuf->is_buffering;
/* scale to high percent so that it becomes the 100% mark */
perc = perc * 100 / dlbuf->high_percent;
/* clip */
if (perc > 100)
perc = 100;
if (percent)
*percent = perc;
GST_DEBUG_OBJECT (dlbuf, "buffering %d, percent %d", dlbuf->is_buffering,
perc);
return TRUE;
}
static void
get_buffering_stats (GstDownloadBuffer * dlbuf, gint percent,
GstBufferingMode * mode, gint * avg_in, gint * avg_out,
gint64 * buffering_left)
{
if (mode)
*mode = GST_BUFFERING_DOWNLOAD;
if (avg_in)
*avg_in = dlbuf->byte_in_rate;
if (avg_out)
*avg_out = dlbuf->byte_out_rate;
if (buffering_left) {
guint64 max, cur;
*buffering_left = (percent == 100 ? 0 : -1);
max = dlbuf->max_level.time;
cur = dlbuf->cur_level.time;
if (percent != 100 && max > cur)
*buffering_left = (max - cur) / 1000000;
}
}
static GstMessage *
update_buffering (GstDownloadBuffer * dlbuf)
{
gint percent;
gboolean post = FALSE;
GstMessage *message = NULL;
if (!get_buffering_percent (dlbuf, NULL, &percent))
return NULL;
if (dlbuf->is_buffering) {
post = TRUE;
/* if we were buffering see if we reached the high watermark */
if (percent >= dlbuf->high_percent)
dlbuf->is_buffering = FALSE;
} else {
/* we were not buffering, check if we need to start buffering if we drop
* below the low threshold */
if (percent < dlbuf->low_percent) {
dlbuf->is_buffering = TRUE;
post = TRUE;
}
}
if (post) {
if (percent == dlbuf->buffering_percent)
post = FALSE;
else
dlbuf->buffering_percent = percent;
}
if (post) {
GstBufferingMode mode;
gint avg_in, avg_out;
gint64 buffering_left;
get_buffering_stats (dlbuf, percent, &mode, &avg_in, &avg_out,
&buffering_left);
message = gst_message_new_buffering (GST_OBJECT_CAST (dlbuf),
(gint) percent);
gst_message_set_buffering_stats (message, mode,
avg_in, avg_out, buffering_left);
}
return message;
}
static gboolean
perform_seek_to_offset (GstDownloadBuffer * dlbuf, guint64 offset)
{
GstEvent *event;
gboolean res;
if (dlbuf->seeking)
return TRUE;
/* until we receive the FLUSH_STOP from this seek, we skip data */
dlbuf->seeking = TRUE;
dlbuf->write_pos = offset;
dlbuf->filling = FALSE;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "Seeking to %" G_GUINT64_FORMAT, offset);
event =
gst_event_new_seek (1.0, GST_FORMAT_BYTES,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET, offset,
GST_SEEK_TYPE_NONE, -1);
res = gst_pad_push_event (dlbuf->sinkpad, event);
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
return res;
}
/* get the threshold for when we decide to seek rather than wait */
static guint64
get_seek_threshold (GstDownloadBuffer * dlbuf)
{
guint64 threshold;
/* FIXME, find a good threshold based on the incoming rate. */
threshold = 1024 * 512;
return threshold;
}
/* called with DOWNLOAD_BUFFER_MUTEX */
static void
gst_download_buffer_update_upstream_size (GstDownloadBuffer * dlbuf)
{
gint64 upstream_size = 0;
if (gst_pad_peer_query_duration (dlbuf->sinkpad, GST_FORMAT_BYTES,
&upstream_size)) {
GST_INFO_OBJECT (dlbuf, "upstream size: %" G_GINT64_FORMAT, upstream_size);
dlbuf->upstream_size = upstream_size;
}
}
/* called with DOWNLOAD_BUFFER_MUTEX */
static GstFlowReturn
gst_download_buffer_wait_for_data (GstDownloadBuffer * dlbuf, guint64 offset,
guint length)
{
gsize start, stop;
guint64 wanted;
gboolean started;
GST_DEBUG_OBJECT (dlbuf, "wait for %" G_GUINT64_FORMAT ", length %u",
offset, length);
wanted = offset + length;
/* pause the timer while we wait. The fact that we are waiting does not mean
* the byterate on the output pad is lower */
if ((started = dlbuf->out_timer_started))
g_timer_stop (dlbuf->out_timer);
/* check range before us */
if (gst_sparse_file_get_range_before (dlbuf->file, offset, &start, &stop)) {
GST_DEBUG_OBJECT (dlbuf,
"range before %" G_GSIZE_FORMAT " - %" G_GSIZE_FORMAT, start, stop);
if (start <= offset && offset < stop) {
GST_DEBUG_OBJECT (dlbuf, "we have the offset");
/* we have the range, continue it */
offset = stop;
} else {
guint64 threshold, dist;
/* there is a range before us, check how far away it is */
threshold = get_seek_threshold (dlbuf);
dist = offset - stop;
if (dist <= threshold) {
GST_DEBUG_OBJECT (dlbuf, "not too far");
/* not far away, continue it */
offset = stop;
}
}
}
if (dlbuf->write_pos != offset) {
perform_seek_to_offset (dlbuf, offset);
/* perform_seek_to_offset() releases the lock, so we may have been flushed
* during the call. */
if (dlbuf->srcresult == GST_FLOW_FLUSHING)
goto out_flushing;
}
dlbuf->filling = TRUE;
if (dlbuf->write_pos > dlbuf->read_pos)
update_levels (dlbuf, dlbuf->write_pos - dlbuf->read_pos);
else
update_levels (dlbuf, 0);
/* now wait for more data */
GST_DEBUG_OBJECT (dlbuf, "waiting for more data");
GST_DOWNLOAD_BUFFER_WAIT_ADD_CHECK (dlbuf, dlbuf->srcresult, wanted,
out_flushing);
GST_DEBUG_OBJECT (dlbuf, "got more data");
/* and continue if we were running before */
if (started)
g_timer_continue (dlbuf->out_timer);
return GST_FLOW_OK;
out_flushing:
{
GST_DEBUG_OBJECT (dlbuf, "we are flushing");
return GST_FLOW_FLUSHING;
}
}
/* called with DOWNLOAD_BUFFER_MUTEX */
static gboolean
check_upstream_size (GstDownloadBuffer * dlbuf, gsize offset, guint * length)
{
gsize stop = offset + *length;
/* catch any reads beyond the size of the file here to make sure cache
* doesn't send seek events beyond the size of the file upstream, since
* that would confuse elements such as souphttpsrc and/or http servers.
* Demuxers often just loop until EOS at the end of the file to figure out
* when they've read all the end-headers or index chunks. */
if (G_UNLIKELY (dlbuf->upstream_size == -1 || stop >= dlbuf->upstream_size)) {
gst_download_buffer_update_upstream_size (dlbuf);
}
if (dlbuf->upstream_size != -1) {
if (offset >= dlbuf->upstream_size)
return FALSE;
if (G_UNLIKELY (stop > dlbuf->upstream_size)) {
*length = dlbuf->upstream_size - offset;
GST_DEBUG_OBJECT (dlbuf, "adjusting length downto %u", *length);
}
}
return TRUE;
}
/* called with DOWNLOAD_BUFFER_MUTEX */
static GstFlowReturn
gst_download_buffer_read_buffer (GstDownloadBuffer * dlbuf, guint64 offset,
guint length, GstBuffer ** buffer)
{
GstBuffer *buf;
GstMapInfo info;
GstFlowReturn ret = GST_FLOW_OK;
gsize res, remaining;
GError *error = NULL;
length = (length == -1) ? DEFAULT_BUFFER_SIZE : length;
offset = (offset == -1) ? dlbuf->read_pos : offset;
if (!check_upstream_size (dlbuf, offset, &length))
goto hit_eos;
/* allocate the output buffer of the requested size */
if (*buffer == NULL)
buf = gst_buffer_new_allocate (NULL, length, NULL);
else
buf = *buffer;
if (!gst_buffer_map (buf, &info, GST_MAP_WRITE))
goto map_failed;
GST_DEBUG_OBJECT (dlbuf, "Reading %u bytes from %" G_GUINT64_FORMAT, length,
offset);
dlbuf->read_pos = offset;
do {
res =
gst_sparse_file_read (dlbuf->file, offset, info.data, length,
&remaining, &error);
if (G_UNLIKELY (res == 0)) {
switch (error->code) {
case GST_SPARSE_FILE_IO_ERROR_WOULD_BLOCK:
/* we don't have the requested data in the file, decide what to
* do next. */
ret = gst_download_buffer_wait_for_data (dlbuf, offset, length);
if (ret != GST_FLOW_OK)
goto out_flushing;
break;
default:
goto read_error;
}
g_clear_error (&error);
}
} while (res == 0);
gst_buffer_unmap (buf, &info);
gst_buffer_resize (buf, 0, res);
dlbuf->bytes_out += res;
dlbuf->read_pos += res;
GST_DEBUG_OBJECT (dlbuf,
"Read %" G_GSIZE_FORMAT " bytes, remaining %" G_GSIZE_FORMAT, res,
remaining);
if (dlbuf->read_pos + remaining == dlbuf->upstream_size)
update_levels (dlbuf, dlbuf->max_level.bytes);
else
update_levels (dlbuf, remaining);
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_OFFSET_END (buf) = offset + res;
*buffer = buf;
return ret;
/* ERRORS */
hit_eos:
{
GST_DEBUG_OBJECT (dlbuf, "EOS hit");
return GST_FLOW_EOS;
}
map_failed:
{
GST_ELEMENT_ERROR (dlbuf, RESOURCE, BUSY,
(_("Failed to map buffer.")), ("failed to map buffer in WRITE mode"));
if (*buffer == NULL)
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
out_flushing:
{
GST_DEBUG_OBJECT (dlbuf, "we are flushing");
g_clear_error (&error);
gst_buffer_unmap (buf, &info);
if (*buffer == NULL)
gst_buffer_unref (buf);
return GST_FLOW_FLUSHING;
}
read_error:
{
GST_DEBUG_OBJECT (dlbuf, "we have a read error: %s", error->message);
g_clear_error (&error);
gst_buffer_unmap (buf, &info);
if (*buffer == NULL)
gst_buffer_unref (buf);
return ret;
}
}
/* must be called with MUTEX_LOCK. Will briefly release the lock when notifying
* the temp filename. */
static gboolean
gst_download_buffer_open_temp_location_file (GstDownloadBuffer * dlbuf)
{
gint fd = -1;
gchar *name = NULL;
if (dlbuf->file)
goto already_opened;
GST_DEBUG_OBJECT (dlbuf, "opening temp file %s", dlbuf->temp_template);
/* If temp_template was set, allocate a filename and open that file */
/* nothing to do */
if (dlbuf->temp_template == NULL)
goto no_directory;
/* make copy of the template, we don't want to change this */
name = g_strdup (dlbuf->temp_template);
#ifdef __BIONIC__
fd = g_mkstemp_full (name, O_RDWR | O_LARGEFILE, S_IRUSR | S_IWUSR);
#else
fd = g_mkstemp (name);
#endif
if (fd == -1)
goto mkstemp_failed;
/* open the file for update/writing */
dlbuf->file = gst_sparse_file_new ();
/* error creating file */
if (!gst_sparse_file_set_fd (dlbuf->file, fd))
goto open_failed;
g_free (dlbuf->temp_location);
dlbuf->temp_location = name;
dlbuf->temp_fd = fd;
reset_positions (dlbuf);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
/* we can't emit the notify with the lock */
g_object_notify (G_OBJECT (dlbuf), "temp-location");
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "opened temp file %s", dlbuf->temp_template);
return TRUE;
/* ERRORS */
already_opened:
{
GST_DEBUG_OBJECT (dlbuf, "temp file was already open");
return TRUE;
}
no_directory:
{
GST_ELEMENT_ERROR (dlbuf, RESOURCE, NOT_FOUND,
(_("No Temp directory specified.")), (NULL));
return FALSE;
}
mkstemp_failed:
{
GST_ELEMENT_ERROR (dlbuf, RESOURCE, OPEN_READ,
(_("Could not create temp file \"%s\"."), dlbuf->temp_template),
GST_ERROR_SYSTEM);
g_free (name);
return FALSE;
}
open_failed:
{
GST_ELEMENT_ERROR (dlbuf, RESOURCE, OPEN_READ,
(_("Could not open file \"%s\" for reading."), name), GST_ERROR_SYSTEM);
g_free (name);
if (fd != -1)
close (fd);
return FALSE;
}
}
static void
gst_download_buffer_close_temp_location_file (GstDownloadBuffer * dlbuf)
{
/* nothing to do */
if (dlbuf->file == NULL)
return;
GST_DEBUG_OBJECT (dlbuf, "closing sparse file");
if (dlbuf->temp_remove) {
if (remove (dlbuf->temp_location) < 0) {
GST_WARNING_OBJECT (dlbuf, "Failed to remove temporary file %s: %s",
dlbuf->temp_location, g_strerror (errno));
}
}
gst_sparse_file_free (dlbuf->file);
close (dlbuf->temp_fd);
dlbuf->file = NULL;
}
static void
gst_download_buffer_flush_temp_file (GstDownloadBuffer * dlbuf)
{
if (dlbuf->file == NULL)
return;
GST_DEBUG_OBJECT (dlbuf, "flushing temp file");
gst_sparse_file_clear (dlbuf->file);
}
static void
gst_download_buffer_locked_flush (GstDownloadBuffer * dlbuf, gboolean full,
gboolean clear_temp)
{
if (clear_temp)
gst_download_buffer_flush_temp_file (dlbuf);
reset_positions (dlbuf);
gst_event_replace (&dlbuf->stream_start_event, NULL);
gst_event_replace (&dlbuf->segment_event, NULL);
}
static gboolean
gst_download_buffer_handle_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean ret = TRUE;
GstDownloadBuffer *dlbuf;
dlbuf = GST_DOWNLOAD_BUFFER (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
{
GST_LOG_OBJECT (dlbuf, "received flush start event");
if (GST_PAD_MODE (dlbuf->srcpad) == GST_PAD_MODE_PUSH) {
/* forward event */
ret = gst_pad_push_event (dlbuf->srcpad, event);
/* now unblock the chain function */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
dlbuf->srcresult = GST_FLOW_FLUSHING;
dlbuf->sinkresult = GST_FLOW_FLUSHING;
/* unblock the loop and chain functions */
GST_DOWNLOAD_BUFFER_SIGNAL_ADD (dlbuf, -1);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
/* make sure it pauses, this should happen since we sent
* flush_start downstream. */
gst_pad_pause_task (dlbuf->srcpad);
GST_LOG_OBJECT (dlbuf, "loop stopped");
} else {
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
/* flush the sink pad */
dlbuf->sinkresult = GST_FLOW_FLUSHING;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_event_unref (event);
}
break;
}
case GST_EVENT_FLUSH_STOP:
{
GST_LOG_OBJECT (dlbuf, "received flush stop event");
if (GST_PAD_MODE (dlbuf->srcpad) == GST_PAD_MODE_PUSH) {
/* forward event */
ret = gst_pad_push_event (dlbuf->srcpad, event);
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
gst_download_buffer_locked_flush (dlbuf, FALSE, TRUE);
dlbuf->srcresult = GST_FLOW_OK;
dlbuf->sinkresult = GST_FLOW_OK;
dlbuf->unexpected = FALSE;
dlbuf->seeking = FALSE;
/* reset rate counters */
reset_rate_timer (dlbuf);
gst_pad_start_task (dlbuf->srcpad,
(GstTaskFunction) gst_download_buffer_loop, dlbuf->srcpad, NULL);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
} else {
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
dlbuf->unexpected = FALSE;
dlbuf->sinkresult = GST_FLOW_OK;
dlbuf->seeking = FALSE;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_event_unref (event);
}
break;
}
default:
if (GST_EVENT_IS_SERIALIZED (event)) {
GstMessage *msg = NULL;
/* serialized events go in the buffer */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK_CHECK (dlbuf, dlbuf->sinkresult,
out_flushing);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (dlbuf, "we have EOS");
/* Zero the thresholds, this makes sure the dlbuf is completely
* filled and we can read all data from the dlbuf. */
/* update the buffering status */
update_levels (dlbuf, dlbuf->max_level.bytes);
/* update the buffering */
msg = update_buffering (dlbuf);
/* wakeup the waiter and let it recheck */
GST_DOWNLOAD_BUFFER_SIGNAL_ADD (dlbuf, -1);
break;
case GST_EVENT_SEGMENT:
gst_event_replace (&dlbuf->segment_event, event);
/* a new segment allows us to accept more buffers if we got EOS
* from downstream */
dlbuf->unexpected = FALSE;
break;
case GST_EVENT_STREAM_START:
gst_event_replace (&dlbuf->stream_start_event, event);
break;
default:
break;
}
gst_event_unref (event);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
if (msg != NULL)
gst_element_post_message (GST_ELEMENT_CAST (dlbuf), msg);
} else {
/* non-serialized events are passed upstream. */
ret = gst_pad_push_event (dlbuf->srcpad, event);
}
break;
}
return ret;
/* ERRORS */
out_flushing:
{
GST_DEBUG_OBJECT (dlbuf, "refusing event, we are flushing");
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_event_unref (event);
return FALSE;
}
}
static gboolean
gst_download_buffer_handle_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstDownloadBuffer *dlbuf;
gboolean res;
dlbuf = GST_DOWNLOAD_BUFFER (parent);
switch (GST_QUERY_TYPE (query)) {
default:
if (GST_QUERY_IS_SERIALIZED (query)) {
GST_DEBUG_OBJECT (dlbuf, "refusing serialized query %p", query);
res = FALSE;
} else {
res = gst_pad_query_default (pad, parent, query);
}
break;
}
return res;
}
static GstFlowReturn
gst_download_buffer_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstDownloadBuffer *dlbuf;
GstMapInfo info;
guint64 offset;
gsize res, available;
GError *error = NULL;
GstMessage *msg = NULL;
dlbuf = GST_DOWNLOAD_BUFFER (parent);
GST_LOG_OBJECT (dlbuf, "received buffer %p of "
"size %" G_GSIZE_FORMAT ", time %" GST_TIME_FORMAT ", duration %"
GST_TIME_FORMAT, buffer, gst_buffer_get_size (buffer),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
/* we have to lock the dlbuf since we span threads */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK_CHECK (dlbuf, dlbuf->sinkresult, out_flushing);
/* when we received unexpected from downstream, refuse more buffers */
if (dlbuf->unexpected)
goto out_eos;
/* while we didn't receive the newsegment, we're seeking and we skip data */
if (dlbuf->seeking)
goto out_seeking;
/* put buffer in dlbuf now */
offset = dlbuf->write_pos;
/* sanity check */
if (GST_BUFFER_OFFSET_IS_VALID (buffer) &&
GST_BUFFER_OFFSET (buffer) != offset) {
GST_WARNING_OBJECT (dlbuf, "buffer offset does not match current writing "
"position! %" G_GINT64_FORMAT " != %" G_GINT64_FORMAT,
GST_BUFFER_OFFSET (buffer), offset);
}
if (!gst_buffer_map (buffer, &info, GST_MAP_READ))
goto map_error;
GST_DEBUG_OBJECT (dlbuf, "Writing %" G_GSIZE_FORMAT " bytes to %"
G_GUINT64_FORMAT, info.size, offset);
res =
gst_sparse_file_write (dlbuf->file, offset, info.data, info.size,
&available, &error);
if (res == 0)
goto write_error;
gst_buffer_unmap (buffer, &info);
gst_buffer_unref (buffer);
dlbuf->write_pos = offset + info.size;
dlbuf->bytes_in += info.size;
GST_DOWNLOAD_BUFFER_SIGNAL_ADD (dlbuf, dlbuf->write_pos + available);
/* we hit the end, see what to do */
if (dlbuf->write_pos + available == dlbuf->upstream_size) {
gsize start, stop;
/* we have everything up to the end, find a region to fill */
if (gst_sparse_file_get_range_after (dlbuf->file, 0, &start, &stop)) {
if (stop < dlbuf->upstream_size) {
/* a hole to fill, seek to its end */
perform_seek_to_offset (dlbuf, stop);
} else {
/* we filled all the holes, we are done */
goto completed;
}
}
} else {
/* see if we need to skip this region or just read it again. The idea
* is that when the region is not big, we want to avoid a seek and just
* let it reread */
guint64 threshold = get_seek_threshold (dlbuf);
if (available > threshold) {
/* further than threshold, it's better to skip than to reread */
perform_seek_to_offset (dlbuf, dlbuf->write_pos + available);
}
}
if (dlbuf->filling) {
if (dlbuf->write_pos > dlbuf->read_pos)
update_levels (dlbuf, dlbuf->write_pos - dlbuf->read_pos);
else
update_levels (dlbuf, 0);
}
/* update the buffering */
msg = update_buffering (dlbuf);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
if (msg != NULL)
gst_element_post_message (GST_ELEMENT_CAST (dlbuf), msg);
return GST_FLOW_OK;
/* ERRORS */
out_flushing:
{
GstFlowReturn ret = dlbuf->sinkresult;
GST_LOG_OBJECT (dlbuf,
"exit because task paused, reason: %s", gst_flow_get_name (ret));
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_buffer_unref (buffer);
return ret;
}
out_eos:
{
GST_LOG_OBJECT (dlbuf, "exit because we received EOS");
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_buffer_unref (buffer);
return GST_FLOW_EOS;
}
out_seeking:
{
GST_LOG_OBJECT (dlbuf, "exit because we are seeking");
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
map_error:
{
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_buffer_unref (buffer);
GST_ELEMENT_ERROR (dlbuf, RESOURCE, BUSY,
(_("Failed to map buffer.")), ("failed to map buffer in READ mode"));
return GST_FLOW_ERROR;
}
write_error:
{
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_buffer_unmap (buffer, &info);
gst_buffer_unref (buffer);
GST_ELEMENT_ERROR (dlbuf, RESOURCE, WRITE,
(_("Error while writing to download file.")), ("%s", error->message));
g_clear_error (&error);
return GST_FLOW_ERROR;
}
completed:
{
GstMessage *complete_message;
GST_LOG_OBJECT (dlbuf, "we completed the download");
dlbuf->write_pos = dlbuf->upstream_size;
dlbuf->filling = FALSE;
update_levels (dlbuf, dlbuf->max_level.bytes);
msg = update_buffering (dlbuf);
complete_message = gst_message_new_element (GST_OBJECT_CAST (dlbuf),
gst_structure_new ("GstCacheDownloadComplete",
"location", G_TYPE_STRING, dlbuf->temp_location, NULL));
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
gst_element_post_message (GST_ELEMENT_CAST (dlbuf), complete_message);
if (msg != NULL)
gst_element_post_message (GST_ELEMENT_CAST (dlbuf), msg);
return GST_FLOW_EOS;
}
}
/* called repeatedly with @pad as the source pad. This function should push out
* data to the peer element. */
static void
gst_download_buffer_loop (GstPad * pad)
{
GstDownloadBuffer *dlbuf;
GstFlowReturn ret;
GstBuffer *buffer = NULL;
GstMessage *msg = NULL;
dlbuf = GST_DOWNLOAD_BUFFER (GST_PAD_PARENT (pad));
/* have to lock for thread-safety */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK_CHECK (dlbuf, dlbuf->srcresult, out_flushing);
if (dlbuf->stream_start_event != NULL) {
gst_pad_push_event (dlbuf->srcpad, dlbuf->stream_start_event);
dlbuf->stream_start_event = NULL;
}
if (dlbuf->segment_event != NULL) {
gst_pad_push_event (dlbuf->srcpad, dlbuf->segment_event);
dlbuf->segment_event = NULL;
}
ret = gst_download_buffer_read_buffer (dlbuf, -1, -1, &buffer);
if (ret != GST_FLOW_OK)
goto out_flushing;
/* update the buffering */
msg = update_buffering (dlbuf);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
if (msg != NULL)
gst_element_post_message (GST_ELEMENT_CAST (dlbuf), msg);
ret = gst_pad_push (dlbuf->srcpad, buffer);
/* need to check for srcresult here as well */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK_CHECK (dlbuf, dlbuf->srcresult, out_flushing);
dlbuf->srcresult = ret;
dlbuf->sinkresult = ret;
if (ret != GST_FLOW_OK)
goto out_flushing;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
return;
/* ERRORS */
out_flushing:
{
GstFlowReturn ret = dlbuf->srcresult;
gst_pad_pause_task (dlbuf->srcpad);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
GST_LOG_OBJECT (dlbuf, "pause task, reason: %s", gst_flow_get_name (ret));
/* let app know about us giving up if upstream is not expected to do so */
if (ret == GST_FLOW_EOS) {
/* FIXME perform EOS logic, this is really a basesrc operating on a
* file. */
gst_pad_push_event (dlbuf->srcpad, gst_event_new_eos ());
} else if ((ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS)) {
GST_ELEMENT_FLOW_ERROR (dlbuf, ret);
gst_pad_push_event (dlbuf->srcpad, gst_event_new_eos ());
}
return;
}
}
static gboolean
gst_download_buffer_handle_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean res = TRUE;
GstDownloadBuffer *dlbuf = GST_DOWNLOAD_BUFFER (parent);
#ifndef GST_DISABLE_GST_DEBUG
GST_DEBUG_OBJECT (dlbuf, "got event %p (%s)",
event, GST_EVENT_TYPE_NAME (event));
#endif
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* now unblock the getrange function */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "flushing");
dlbuf->srcresult = GST_FLOW_FLUSHING;
GST_DOWNLOAD_BUFFER_SIGNAL_ADD (dlbuf, -1);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
/* when using a temp file, we eat the event */
res = TRUE;
gst_event_unref (event);
break;
case GST_EVENT_FLUSH_STOP:
/* now unblock the getrange function */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
dlbuf->srcresult = GST_FLOW_OK;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
/* when using a temp file, we eat the event */
res = TRUE;
gst_event_unref (event);
break;
case GST_EVENT_RECONFIGURE:
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
/* assume downstream is linked now and try to push again */
if (dlbuf->srcresult == GST_FLOW_NOT_LINKED) {
dlbuf->srcresult = GST_FLOW_OK;
dlbuf->sinkresult = GST_FLOW_OK;
if (GST_PAD_MODE (pad) == GST_PAD_MODE_PUSH) {
gst_pad_start_task (pad, (GstTaskFunction) gst_download_buffer_loop,
pad, NULL);
}
}
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
res = gst_pad_push_event (dlbuf->sinkpad, event);
break;
default:
res = gst_pad_push_event (dlbuf->sinkpad, event);
break;
}
return res;
}
static gboolean
gst_download_buffer_handle_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstDownloadBuffer *dlbuf;
dlbuf = GST_DOWNLOAD_BUFFER (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 peer_pos;
GstFormat format;
if (!gst_pad_peer_query (dlbuf->sinkpad, query))
goto peer_failed;
/* get peer position */
gst_query_parse_position (query, &format, &peer_pos);
/* FIXME: this code assumes that there's no discont in the dlbuf */
switch (format) {
case GST_FORMAT_BYTES:
peer_pos -= dlbuf->cur_level.bytes;
if (peer_pos < 0) /* Clamp result to 0 */
peer_pos = 0;
break;
case GST_FORMAT_TIME:
peer_pos -= dlbuf->cur_level.time;
if (peer_pos < 0) /* Clamp result to 0 */
peer_pos = 0;
break;
default:
GST_WARNING_OBJECT (dlbuf, "dropping query in %s format, don't "
"know how to adjust value", gst_format_get_name (format));
return FALSE;
}
/* set updated position */
gst_query_set_position (query, format, peer_pos);
break;
}
case GST_QUERY_DURATION:
{
GST_DEBUG_OBJECT (dlbuf, "doing peer query");
if (!gst_pad_peer_query (dlbuf->sinkpad, query))
goto peer_failed;
GST_DEBUG_OBJECT (dlbuf, "peer query success");
break;
}
case GST_QUERY_BUFFERING:
{
gint percent;
gboolean is_buffering;
GstBufferingMode mode;
gint avg_in, avg_out;
gint64 buffering_left;
GST_DEBUG_OBJECT (dlbuf, "query buffering");
get_buffering_percent (dlbuf, &is_buffering, &percent);
gst_query_set_buffering_percent (query, is_buffering, percent);
get_buffering_stats (dlbuf, percent, &mode, &avg_in, &avg_out,
&buffering_left);
gst_query_set_buffering_stats (query, mode, avg_in, avg_out,
buffering_left);
{
/* add ranges for download and ringbuffer buffering */
GstFormat format;
gint64 start, stop;
guint64 write_pos;
gint64 estimated_total;
gint64 duration;
gsize offset, range_start, range_stop;
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
write_pos = dlbuf->write_pos;
/* get duration of upstream in bytes */
gst_download_buffer_update_upstream_size (dlbuf);
duration = dlbuf->upstream_size;
GST_DEBUG_OBJECT (dlbuf, "percent %d, duration %" G_GINT64_FORMAT
", writing %" G_GINT64_FORMAT, percent, duration, write_pos);
gst_query_parse_buffering_range (query, &format, NULL, NULL, NULL);
/* fill out the buffered ranges */
start = offset = 0;
stop = -1;
estimated_total = -1;
while (gst_sparse_file_get_range_after (dlbuf->file, offset,
&range_start, &range_stop)) {
gboolean current_range;
GST_DEBUG_OBJECT (dlbuf,
"range starting at %" G_GSIZE_FORMAT " and finishing at %"
G_GSIZE_FORMAT, range_start, range_stop);
offset = range_stop;
/* find the range we are currently downloading, we'll remember it
* after we convert to the target format */
if (range_start <= write_pos && range_stop >= write_pos) {
current_range = TRUE;
/* calculate remaining and total download time */
if (duration >= range_stop && avg_in > 0.0)
estimated_total = ((duration - range_stop) * 1000) / avg_in;
} else
current_range = FALSE;
switch (format) {
case GST_FORMAT_PERCENT:
/* get our available data relative to the duration */
if (duration == -1) {
range_start = 0;
range_stop = 0;
} else {
range_start = gst_util_uint64_scale (GST_FORMAT_PERCENT_MAX,
range_start, duration);
range_stop = gst_util_uint64_scale (GST_FORMAT_PERCENT_MAX,
range_stop, duration);
}
break;
case GST_FORMAT_BYTES:
break;
default:
range_start = -1;
range_stop = -1;
break;
}
if (current_range) {
/* we are currently downloading this range */
start = range_start;
stop = range_stop;
}
GST_DEBUG_OBJECT (dlbuf,
"range to format: %" G_GSIZE_FORMAT " - %" G_GSIZE_FORMAT,
range_start, range_stop);
if (range_start == range_stop)
continue;
gst_query_add_buffering_range (query, range_start, range_stop);
}
GST_DEBUG_OBJECT (dlbuf, "estimated-total %" G_GINT64_FORMAT,
estimated_total);
gst_query_set_buffering_range (query, format, start, stop,
estimated_total);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
}
break;
}
case GST_QUERY_SCHEDULING:
{
GstSchedulingFlags flags = 0;
if (!gst_pad_peer_query (dlbuf->sinkpad, query))
goto peer_failed;
gst_query_parse_scheduling (query, &flags, NULL, NULL, NULL);
/* we can operate in pull mode when we are using a tempfile */
flags |= GST_SCHEDULING_FLAG_SEEKABLE;
gst_query_set_scheduling (query, flags, 0, -1, 0);
gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
break;
}
default:
/* peer handled other queries */
if (!gst_pad_query_default (pad, parent, query))
goto peer_failed;
break;
}
return TRUE;
/* ERRORS */
peer_failed:
{
GST_DEBUG_OBJECT (dlbuf, "failed peer query");
return FALSE;
}
}
static gboolean
gst_download_buffer_handle_query (GstElement * element, GstQuery * query)
{
GstDownloadBuffer *dlbuf = GST_DOWNLOAD_BUFFER (element);
/* simply forward to the srcpad query function */
return gst_download_buffer_handle_src_query (dlbuf->srcpad,
GST_OBJECT_CAST (element), query);
}
static GstFlowReturn
gst_download_buffer_get_range (GstPad * pad, GstObject * parent, guint64 offset,
guint length, GstBuffer ** buffer)
{
GstDownloadBuffer *dlbuf;
GstFlowReturn ret;
GstMessage *msg = NULL;
dlbuf = GST_DOWNLOAD_BUFFER_CAST (parent);
GST_DOWNLOAD_BUFFER_MUTEX_LOCK_CHECK (dlbuf, dlbuf->srcresult, out_flushing);
/* FIXME - function will block when the range is not yet available */
ret = gst_download_buffer_read_buffer (dlbuf, offset, length, buffer);
/* update the buffering */
msg = update_buffering (dlbuf);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
if (msg != NULL)
gst_element_post_message (GST_ELEMENT_CAST (dlbuf), msg);
return ret;
/* ERRORS */
out_flushing:
{
ret = dlbuf->srcresult;
GST_DEBUG_OBJECT (dlbuf, "we are flushing");
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
return ret;
}
}
/* sink currently only operates in push mode */
static gboolean
gst_download_buffer_sink_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean result;
GstDownloadBuffer *dlbuf;
dlbuf = GST_DOWNLOAD_BUFFER (parent);
switch (mode) {
case GST_PAD_MODE_PUSH:
if (active) {
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "activating push mode");
dlbuf->srcresult = GST_FLOW_OK;
dlbuf->sinkresult = GST_FLOW_OK;
dlbuf->unexpected = FALSE;
reset_rate_timer (dlbuf);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
} else {
/* unblock chain function */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "deactivating push mode");
dlbuf->srcresult = GST_FLOW_FLUSHING;
dlbuf->sinkresult = GST_FLOW_FLUSHING;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
/* wait until it is unblocked and clean up */
GST_PAD_STREAM_LOCK (pad);
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
gst_download_buffer_locked_flush (dlbuf, TRUE, FALSE);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
GST_PAD_STREAM_UNLOCK (pad);
}
result = TRUE;
break;
default:
result = FALSE;
break;
}
return result;
}
/* src operating in push mode, we start a task on the source pad that pushes out
* buffers from the dlbuf */
static gboolean
gst_download_buffer_src_activate_push (GstPad * pad, GstObject * parent,
gboolean active)
{
gboolean result = FALSE;
GstDownloadBuffer *dlbuf;
dlbuf = GST_DOWNLOAD_BUFFER (parent);
if (active) {
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "activating push mode");
dlbuf->srcresult = GST_FLOW_OK;
dlbuf->sinkresult = GST_FLOW_OK;
dlbuf->unexpected = FALSE;
result =
gst_pad_start_task (pad, (GstTaskFunction) gst_download_buffer_loop,
pad, NULL);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
} else {
/* unblock loop function */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "deactivating push mode");
dlbuf->srcresult = GST_FLOW_FLUSHING;
dlbuf->sinkresult = GST_FLOW_FLUSHING;
/* the item add signal will unblock */
GST_DOWNLOAD_BUFFER_SIGNAL_ADD (dlbuf, -1);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (pad);
}
return result;
}
/* pull mode, downstream will call our getrange function */
static gboolean
gst_download_buffer_src_activate_pull (GstPad * pad, GstObject * parent,
gboolean active)
{
gboolean result;
GstDownloadBuffer *dlbuf;
dlbuf = GST_DOWNLOAD_BUFFER (parent);
if (active) {
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
/* open the temp file now */
result = gst_download_buffer_open_temp_location_file (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "activating pull mode");
dlbuf->srcresult = GST_FLOW_OK;
dlbuf->sinkresult = GST_FLOW_OK;
dlbuf->unexpected = FALSE;
dlbuf->upstream_size = 0;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
} else {
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
GST_DEBUG_OBJECT (dlbuf, "deactivating pull mode");
dlbuf->srcresult = GST_FLOW_FLUSHING;
dlbuf->sinkresult = GST_FLOW_FLUSHING;
/* this will unlock getrange */
GST_DOWNLOAD_BUFFER_SIGNAL_ADD (dlbuf, -1);
result = TRUE;
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
}
return result;
}
static gboolean
gst_download_buffer_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean res;
switch (mode) {
case GST_PAD_MODE_PULL:
res = gst_download_buffer_src_activate_pull (pad, parent, active);
break;
case GST_PAD_MODE_PUSH:
res = gst_download_buffer_src_activate_push (pad, parent, active);
break;
default:
GST_LOG_OBJECT (pad, "unknown activation mode %d", mode);
res = FALSE;
break;
}
return res;
}
static GstStateChangeReturn
gst_download_buffer_change_state (GstElement * element,
GstStateChange transition)
{
GstDownloadBuffer *dlbuf;
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
dlbuf = GST_DOWNLOAD_BUFFER (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
if (!gst_download_buffer_open_temp_location_file (dlbuf))
ret = GST_STATE_CHANGE_FAILURE;
gst_event_replace (&dlbuf->stream_start_event, NULL);
gst_event_replace (&dlbuf->segment_event, NULL);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
gst_download_buffer_close_temp_location_file (dlbuf);
gst_event_replace (&dlbuf->stream_start_event, NULL);
gst_event_replace (&dlbuf->segment_event, NULL);
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
#define CAPACITY_CHANGE(elem) \
update_buffering (elem);
static void
gst_download_buffer_set_temp_template (GstDownloadBuffer * dlbuf,
const gchar * template)
{
GstState state;
/* the element must be stopped in order to do this */
GST_OBJECT_LOCK (dlbuf);
state = GST_STATE (dlbuf);
if (state != GST_STATE_READY && state != GST_STATE_NULL)
goto wrong_state;
GST_OBJECT_UNLOCK (dlbuf);
/* set new location */
g_free (dlbuf->temp_template);
dlbuf->temp_template = g_strdup (template);
return;
/* ERROR */
wrong_state:
{
GST_WARNING_OBJECT (dlbuf, "setting temp-template property in wrong state");
GST_OBJECT_UNLOCK (dlbuf);
}
}
static void
gst_download_buffer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstDownloadBuffer *dlbuf = GST_DOWNLOAD_BUFFER (object);
GstMessage *msg = NULL;
/* someone could change levels here, and since this
* affects the get/put funcs, we need to lock for safety. */
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
switch (prop_id) {
case PROP_MAX_SIZE_BYTES:
dlbuf->max_level.bytes = g_value_get_uint (value);
msg = CAPACITY_CHANGE (dlbuf);
break;
case PROP_MAX_SIZE_TIME:
dlbuf->max_level.time = g_value_get_uint64 (value);
msg = CAPACITY_CHANGE (dlbuf);
break;
case PROP_LOW_PERCENT:
dlbuf->low_percent = g_value_get_int (value);
break;
case PROP_HIGH_PERCENT:
dlbuf->high_percent = g_value_get_int (value);
break;
case PROP_TEMP_TEMPLATE:
gst_download_buffer_set_temp_template (dlbuf, g_value_get_string (value));
break;
case PROP_TEMP_REMOVE:
dlbuf->temp_remove = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
if (msg != NULL)
gst_element_post_message (GST_ELEMENT_CAST (dlbuf), msg);
}
static void
gst_download_buffer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstDownloadBuffer *dlbuf = GST_DOWNLOAD_BUFFER (object);
GST_DOWNLOAD_BUFFER_MUTEX_LOCK (dlbuf);
switch (prop_id) {
case PROP_MAX_SIZE_BYTES:
g_value_set_uint (value, dlbuf->max_level.bytes);
break;
case PROP_MAX_SIZE_TIME:
g_value_set_uint64 (value, dlbuf->max_level.time);
break;
case PROP_LOW_PERCENT:
g_value_set_int (value, dlbuf->low_percent);
break;
case PROP_HIGH_PERCENT:
g_value_set_int (value, dlbuf->high_percent);
break;
case PROP_TEMP_TEMPLATE:
g_value_set_string (value, dlbuf->temp_template);
break;
case PROP_TEMP_LOCATION:
g_value_set_string (value, dlbuf->temp_location);
break;
case PROP_TEMP_REMOVE:
g_value_set_boolean (value, dlbuf->temp_remove);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_DOWNLOAD_BUFFER_MUTEX_UNLOCK (dlbuf);
}
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