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gstreamer/plugins/elements/gstdownloadbuffer.c

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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
*
* 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 emiting 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 <classname>&quot;GstCacheDownloadComplete&quot;</classname>
* with the following information:
* <itemizedlist>
* <listitem>
* <para>
* G_TYPE_STRING
* <classname>&quot;location&quot;</classname>:
* the location of the completely downloaded file.
* </para>
* </listitem>
* </itemizedlist>
*/
#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
#undef off_t
#define off_t guint64
#else
#include <unistd.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_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&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);
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;
gst_buffer_map (buf, &info, GST_MAP_WRITE);
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;
}
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 filen */
/* 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);
fd = g_mkstemp (name);
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_LOG_OBJECT (dlbuf, "received query %p", query);
GST_DEBUG_OBJECT (dlbuf, "refusing query, we are not using the dlbuf");
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);
}
gst_buffer_map (buffer, &info, GST_MAP_READ);
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;
}
write_error:
{
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:
{
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);
gst_element_post_message (GST_ELEMENT_CAST (dlbuf),
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);
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);
g_atomic_int_set (&dlbuf->downstream_may_block, 1);
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);
g_atomic_int_set (&dlbuf->downstream_may_block, 0);
/* 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_ERROR (dlbuf, STREAM, FAILED,
(_("Internal data flow error.")),
("streaming task paused, reason %s (%d)",
gst_flow_get_name (ret), 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;
break;
case GST_FORMAT_TIME:
peer_pos -= dlbuf->cur_level.time;
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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