gstreamer/gst-libs/gst/video/convertframe.c

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/* Small helper element for format conversion
* Copyright (C) 2005 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2010 Brandon Lewis <brandon.lewis@collabora.co.uk>
* Copyright (C) 2010 Edward Hervey <edward.hervey@collabora.co.uk>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "video.h"
static gboolean
caps_are_raw (const GstCaps * caps)
{
guint i, len;
len = gst_caps_get_size (caps);
for (i = 0; i < len; i++) {
GstStructure *st = gst_caps_get_structure (caps, i);
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if (gst_structure_has_name (st, "video/x-raw"))
return TRUE;
}
return FALSE;
}
static gboolean
create_element (const gchar * factory_name, GstElement ** element,
GError ** err)
{
*element = gst_element_factory_make (factory_name, NULL);
if (*element)
return TRUE;
if (err && *err == NULL) {
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
"cannot create element '%s' - please check your GStreamer installation",
factory_name);
}
return FALSE;
}
static GstElement *
get_encoder (const GstCaps * caps, GError ** err)
{
GList *encoders = NULL;
GList *filtered = NULL;
GstElementFactory *factory = NULL;
GstElement *encoder = NULL;
encoders =
gst_element_factory_list_get_elements (GST_ELEMENT_FACTORY_TYPE_ENCODER |
GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE, GST_RANK_NONE);
if (encoders == NULL) {
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
"Cannot find any image encoder");
goto fail;
}
GST_INFO ("got factory list %p", encoders);
gst_plugin_feature_list_debug (encoders);
filtered =
gst_element_factory_list_filter (encoders, caps, GST_PAD_SRC, FALSE);
GST_INFO ("got filtered list %p", filtered);
if (filtered == NULL) {
gchar *tmp = gst_caps_to_string (caps);
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
"Cannot find any image encoder for caps %s", tmp);
g_free (tmp);
goto fail;
}
gst_plugin_feature_list_debug (filtered);
factory = (GstElementFactory *) filtered->data;
GST_INFO ("got factory %p", factory);
encoder = gst_element_factory_create (factory, NULL);
GST_INFO ("created encoder element %p, %s", encoder,
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GST_ELEMENT_NAME (encoder));
fail:
if (encoders)
gst_plugin_feature_list_free (encoders);
if (filtered)
gst_plugin_feature_list_free (filtered);
return encoder;
}
static GstElement *
build_convert_frame_pipeline (GstElement ** src_element,
GstElement ** sink_element, const GstCaps * from_caps,
GstVideoCropMeta * cmeta, const GstCaps * to_caps, GError ** err)
{
GstElement *vcrop = NULL, *csp = NULL, *csp2 = NULL, *vscale = NULL;
GstElement *src = NULL, *sink = NULL, *encoder = NULL, *pipeline;
GstVideoInfo info;
GError *error = NULL;
if (cmeta) {
if (!create_element ("videocrop", &vcrop, &error)) {
g_error_free (error);
g_warning
("build_convert_frame_pipeline: Buffer has crop metadata but videocrop element is not found. Cropping will be disabled");
} else {
if (!create_element ("videoconvert", &csp2, &error))
goto no_elements;
}
}
/* videoscale is here to correct for the pixel-aspect-ratio for us */
GST_DEBUG ("creating elements");
if (!create_element ("appsrc", &src, &error) ||
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!create_element ("videoconvert", &csp, &error) ||
!create_element ("videoscale", &vscale, &error) ||
!create_element ("appsink", &sink, &error))
goto no_elements;
pipeline = gst_pipeline_new ("videoconvert-pipeline");
if (pipeline == NULL)
goto no_pipeline;
/* Add black borders if necessary to keep the DAR */
g_object_set (vscale, "add-borders", TRUE, NULL);
GST_DEBUG ("adding elements");
gst_bin_add_many (GST_BIN (pipeline), src, csp, vscale, sink, NULL);
if (vcrop)
gst_bin_add_many (GST_BIN (pipeline), vcrop, csp2, NULL);
/* set caps */
g_object_set (src, "caps", from_caps, NULL);
if (vcrop) {
gst_video_info_from_caps (&info, from_caps);
g_object_set (vcrop, "left", cmeta->x, NULL);
g_object_set (vcrop, "top", cmeta->y, NULL);
g_object_set (vcrop, "right", GST_VIDEO_INFO_WIDTH (&info) - cmeta->width,
NULL);
g_object_set (vcrop, "bottom",
GST_VIDEO_INFO_HEIGHT (&info) - cmeta->height, NULL);
GST_DEBUG ("crop meta [x,y,width,height]: %d %d %d %d", cmeta->x, cmeta->y,
cmeta->width, cmeta->height);
}
g_object_set (sink, "caps", to_caps, NULL);
/* FIXME: linking is still way too expensive, profile this properly */
if (vcrop) {
GST_DEBUG ("linking src->csp2");
if (!gst_element_link_pads (src, "src", csp2, "sink"))
goto link_failed;
GST_DEBUG ("linking csp2->vcrop");
if (!gst_element_link_pads (csp2, "src", vcrop, "sink"))
goto link_failed;
GST_DEBUG ("linking vcrop->csp");
if (!gst_element_link_pads (vcrop, "src", csp, "sink"))
goto link_failed;
} else {
GST_DEBUG ("linking src->csp");
if (!gst_element_link_pads (src, "src", csp, "sink"))
goto link_failed;
}
GST_DEBUG ("linking csp->vscale");
if (!gst_element_link_pads_full (csp, "src", vscale, "sink",
GST_PAD_LINK_CHECK_NOTHING))
goto link_failed;
if (caps_are_raw (to_caps)) {
GST_DEBUG ("linking vscale->sink");
if (!gst_element_link_pads_full (vscale, "src", sink, "sink",
GST_PAD_LINK_CHECK_NOTHING))
goto link_failed;
} else {
encoder = get_encoder (to_caps, &error);
if (!encoder)
goto no_encoder;
gst_bin_add (GST_BIN (pipeline), encoder);
GST_DEBUG ("linking vscale->encoder");
if (!gst_element_link (vscale, encoder))
goto link_failed;
GST_DEBUG ("linking encoder->sink");
if (!gst_element_link_pads (encoder, "src", sink, "sink"))
goto link_failed;
}
g_object_set (src, "emit-signals", TRUE, NULL);
g_object_set (sink, "emit-signals", TRUE, NULL);
*src_element = src;
*sink_element = sink;
return pipeline;
/* ERRORS */
no_encoder:
{
gst_object_unref (pipeline);
GST_ERROR ("could not find an encoder for provided caps");
if (err)
*err = error;
else
g_error_free (error);
return NULL;
}
no_elements:
{
if (src)
gst_object_unref (src);
if (vcrop)
gst_object_unref (vcrop);
if (csp)
gst_object_unref (csp);
if (csp2)
gst_object_unref (csp2);
if (vscale)
gst_object_unref (vscale);
if (sink)
gst_object_unref (sink);
GST_ERROR ("Could not convert video frame: %s", error->message);
if (err)
*err = error;
else
g_error_free (error);
return NULL;
}
no_pipeline:
{
gst_object_unref (src);
if (vcrop)
gst_object_unref (vcrop);
gst_object_unref (csp);
if (csp2)
gst_object_unref (csp2);
gst_object_unref (vscale);
gst_object_unref (sink);
GST_ERROR ("Could not convert video frame: no pipeline (unknown error)");
if (err)
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
"Could not convert video frame: no pipeline (unknown error)");
return NULL;
}
link_failed:
{
gst_object_unref (pipeline);
GST_ERROR ("Could not convert video frame: failed to link elements");
if (err)
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
"Could not convert video frame: failed to link elements");
return NULL;
}
}
/**
* gst_video_convert_sample:
* @sample: a #GstSample
* @to_caps: the #GstCaps to convert to
* @timeout: the maximum amount of time allowed for the processing.
* @error: pointer to a #GError. Can be %NULL.
*
* Converts a raw video buffer into the specified output caps.
*
* The output caps can be any raw video formats or any image formats (jpeg, png, ...).
*
* The width, height and pixel-aspect-ratio can also be specified in the output caps.
*
* Returns: The converted #GstSample, or %NULL if an error happened (in which case @err
* will point to the #GError).
*/
GstSample *
gst_video_convert_sample (GstSample * sample, const GstCaps * to_caps,
GstClockTime timeout, GError ** error)
{
GstMessage *msg;
GstBuffer *buf;
GstSample *result = NULL;
GError *err = NULL;
GstBus *bus;
GstCaps *from_caps, *to_caps_copy = NULL;
GstFlowReturn ret;
GstElement *pipeline, *src, *sink;
guint i, n;
g_return_val_if_fail (sample != NULL, NULL);
g_return_val_if_fail (to_caps != NULL, NULL);
buf = gst_sample_get_buffer (sample);
g_return_val_if_fail (buf != NULL, NULL);
from_caps = gst_sample_get_caps (sample);
g_return_val_if_fail (from_caps != NULL, NULL);
to_caps_copy = gst_caps_new_empty ();
n = gst_caps_get_size (to_caps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (to_caps, i);
s = gst_structure_copy (s);
gst_structure_remove_field (s, "framerate");
gst_caps_append_structure (to_caps_copy, s);
}
pipeline =
build_convert_frame_pipeline (&src, &sink, from_caps,
gst_buffer_get_video_crop_meta (buf), to_caps_copy, &err);
if (!pipeline)
goto no_pipeline;
/* now set the pipeline to the paused state, after we push the buffer into
* appsrc, this should preroll the converted buffer in appsink */
GST_DEBUG ("running conversion pipeline to caps %" GST_PTR_FORMAT,
to_caps_copy);
if (gst_element_set_state (pipeline,
GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE)
goto state_change_failed;
/* feed buffer in appsrc */
GST_DEBUG ("feeding buffer %p, size %" G_GSIZE_FORMAT ", caps %"
GST_PTR_FORMAT, buf, gst_buffer_get_size (buf), from_caps);
g_signal_emit_by_name (src, "push-buffer", buf, &ret);
/* now see what happens. We either got an error somewhere or the pipeline
* prerolled */
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus,
timeout, GST_MESSAGE_ERROR | GST_MESSAGE_ASYNC_DONE);
if (msg) {
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ASYNC_DONE:
{
/* we're prerolled, get the frame from appsink */
g_signal_emit_by_name (sink, "pull-preroll", &result);
if (result) {
GST_DEBUG ("conversion successful: result = %p", result);
} else {
GST_ERROR ("prerolled but no result frame?!");
}
break;
}
case GST_MESSAGE_ERROR:{
gchar *dbg = NULL;
gst_message_parse_error (msg, &err, &dbg);
if (err) {
GST_ERROR ("Could not convert video frame: %s", err->message);
GST_DEBUG ("%s [debug: %s]", err->message, GST_STR_NULL (dbg));
if (error)
*error = err;
else
g_error_free (err);
}
g_free (dbg);
break;
}
default:{
g_return_val_if_reached (NULL);
}
}
gst_message_unref (msg);
} else {
GST_ERROR ("Could not convert video frame: timeout during conversion");
if (error)
*error = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
"Could not convert video frame: timeout during conversion");
}
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (bus);
gst_object_unref (pipeline);
gst_caps_unref (to_caps_copy);
return result;
/* ERRORS */
no_pipeline:
state_change_failed:
{
gst_caps_unref (to_caps_copy);
if (error)
*error = err;
else
g_error_free (err);
return NULL;
}
}
typedef struct
{
gint ref_count;
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GMutex mutex;
GstElement *pipeline;
GstVideoConvertSampleCallback callback;
gpointer user_data;
GDestroyNotify destroy_notify;
GMainContext *context;
GstSample *sample;
GSource *timeout_source;
gboolean finished;
/* Results */
GstSample *converted_sample;
GError *error;
} GstVideoConvertSampleContext;
static GstVideoConvertSampleContext *
gst_video_convert_frame_context_ref (GstVideoConvertSampleContext * ctx)
{
g_atomic_int_inc (&ctx->ref_count);
return ctx;
}
static void
gst_video_convert_frame_context_unref (GstVideoConvertSampleContext * ctx)
{
if (!g_atomic_int_dec_and_test (&ctx->ref_count))
return;
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g_mutex_clear (&ctx->mutex);
if (ctx->timeout_source)
g_source_destroy (ctx->timeout_source);
if (ctx->sample)
gst_sample_unref (ctx->sample);
if (ctx->converted_sample)
gst_sample_unref (ctx->converted_sample);
g_clear_error (&ctx->error);
g_main_context_unref (ctx->context);
/* The pipeline was already destroyed in finish() earlier and we
* must not end up here without finish() being called */
g_warn_if_fail (ctx->pipeline == NULL);
g_slice_free (GstVideoConvertSampleContext, ctx);
}
static gboolean
convert_frame_dispatch_callback (GstVideoConvertSampleContext * ctx)
{
GstSample *sample;
GError *error;
g_return_val_if_fail (ctx->converted_sample != NULL
|| ctx->error != NULL, FALSE);
sample = ctx->converted_sample;
error = ctx->error;
ctx->converted_sample = NULL;
ctx->error = NULL;
ctx->callback (sample, error, ctx->user_data);
if (ctx->destroy_notify)
ctx->destroy_notify (ctx->user_data);
return FALSE;
}
static void
convert_frame_stop_pipeline (GstElement * element, gpointer user_data)
{
gst_element_set_state (element, GST_STATE_NULL);
}
static void
convert_frame_finish (GstVideoConvertSampleContext * context,
GstSample * sample, GError * error)
{
GSource *source;
g_return_if_fail (!context->finished);
g_return_if_fail (sample != NULL || error != NULL);
context->finished = TRUE;
context->converted_sample = sample;
context->error = error;
if (context->timeout_source)
g_source_destroy (context->timeout_source);
context->timeout_source = NULL;
source = g_timeout_source_new (0);
g_source_set_callback (source,
(GSourceFunc) convert_frame_dispatch_callback,
gst_video_convert_frame_context_ref (context),
(GDestroyNotify) gst_video_convert_frame_context_unref);
g_source_attach (source, context->context);
g_source_unref (source);
/* Asynchronously stop the pipeline here: this will set its
* state to NULL and get rid of its last reference, which in turn
* will get rid of all remaining references to our context and free
* it too. We can't do this directly here as we might be called from
* a streaming thread.
*
* We don't use the main loop here because the user might shut down it
* immediately after getting the result of the conversion above.
*/
if (context->pipeline) {
gst_element_call_async (context->pipeline, convert_frame_stop_pipeline,
NULL, NULL);
context->pipeline = NULL;
}
}
static gboolean
convert_frame_timeout_callback (GstVideoConvertSampleContext * context)
{
GError *error;
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g_mutex_lock (&context->mutex);
if (context->finished)
goto done;
GST_ERROR ("Could not convert video frame: timeout");
error = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
"Could not convert video frame: timeout");
convert_frame_finish (context, NULL, error);
done:
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g_mutex_unlock (&context->mutex);
return FALSE;
}
static gboolean
convert_frame_bus_callback (GstBus * bus, GstMessage * message,
GstVideoConvertSampleContext * context)
{
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g_mutex_lock (&context->mutex);
if (context->finished)
goto done;
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
GError *error;
gchar *dbg = NULL;
gst_message_parse_error (message, &error, &dbg);
GST_ERROR ("Could not convert video frame: %s", error->message);
GST_DEBUG ("%s [debug: %s]", error->message, GST_STR_NULL (dbg));
convert_frame_finish (context, NULL, error);
g_free (dbg);
break;
}
default:
break;
}
done:
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g_mutex_unlock (&context->mutex);
return FALSE;
}
static void
convert_frame_need_data_callback (GstElement * src, guint size,
GstVideoConvertSampleContext * context)
{
GstFlowReturn ret = GST_FLOW_ERROR;
GError *error;
GstBuffer *buffer;
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g_mutex_lock (&context->mutex);
if (context->finished)
goto done;
buffer = gst_sample_get_buffer (context->sample);
g_signal_emit_by_name (src, "push-buffer", buffer, &ret);
gst_sample_unref (context->sample);
context->sample = NULL;
if (ret != GST_FLOW_OK) {
GST_ERROR ("Could not push video frame: %s", gst_flow_get_name (ret));
error = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
"Could not push video frame: %s", gst_flow_get_name (ret));
convert_frame_finish (context, NULL, error);
}
done:
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g_mutex_unlock (&context->mutex);
g_signal_handlers_disconnect_by_func (src, convert_frame_need_data_callback,
context);
}
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static GstFlowReturn
convert_frame_new_preroll_callback (GstElement * sink,
GstVideoConvertSampleContext * context)
{
GstSample *sample = NULL;
GError *error = NULL;
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g_mutex_lock (&context->mutex);
if (context->finished)
goto done;
g_signal_emit_by_name (sink, "pull-preroll", &sample);
if (!sample) {
error = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
"Could not get converted video sample");
}
convert_frame_finish (context, sample, error);
done:
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g_mutex_unlock (&context->mutex);
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g_signal_handlers_disconnect_by_func (sink, convert_frame_need_data_callback,
context);
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return GST_FLOW_OK;
}
/**
* gst_video_convert_sample_async:
* @sample: a #GstSample
* @to_caps: the #GstCaps to convert to
* @timeout: the maximum amount of time allowed for the processing.
* @callback: %GstVideoConvertSampleCallback that will be called after conversion.
* @user_data: extra data that will be passed to the @callback
* @destroy_notify: %GDestroyNotify to be called after @user_data is not needed anymore
*
* Converts a raw video buffer into the specified output caps.
*
* The output caps can be any raw video formats or any image formats (jpeg, png, ...).
*
* The width, height and pixel-aspect-ratio can also be specified in the output caps.
*
* @callback will be called after conversion, when an error occured or if conversion didn't
* finish after @timeout. @callback will always be called from the thread default
* %GMainContext, see g_main_context_get_thread_default(). If GLib before 2.22 is used,
* this will always be the global default main context.
*
* @destroy_notify will be called after the callback was called and @user_data is not needed
* anymore.
*/
void
gst_video_convert_sample_async (GstSample * sample,
const GstCaps * to_caps, GstClockTime timeout,
GstVideoConvertSampleCallback callback, gpointer user_data,
GDestroyNotify destroy_notify)
{
GMainContext *context = NULL;
GError *error = NULL;
GstBus *bus;
GstBuffer *buf;
GstCaps *from_caps, *to_caps_copy = NULL;
GstElement *pipeline, *src, *sink;
guint i, n;
GSource *source;
GstVideoConvertSampleContext *ctx;
g_return_if_fail (sample != NULL);
buf = gst_sample_get_buffer (sample);
g_return_if_fail (buf != NULL);
g_return_if_fail (to_caps != NULL);
from_caps = gst_sample_get_caps (sample);
g_return_if_fail (from_caps != NULL);
g_return_if_fail (callback != NULL);
context = g_main_context_get_thread_default ();
if (!context)
context = g_main_context_default ();
to_caps_copy = gst_caps_new_empty ();
n = gst_caps_get_size (to_caps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (to_caps, i);
s = gst_structure_copy (s);
gst_structure_remove_field (s, "framerate");
gst_caps_append_structure (to_caps_copy, s);
}
/* There's a reference cycle between the context and the pipeline, which is
* broken up once the finish() is called on the context. At latest when the
* timeout triggers the context will be freed */
ctx = g_slice_new0 (GstVideoConvertSampleContext);
ctx->ref_count = 1;
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g_mutex_init (&ctx->mutex);
ctx->sample = gst_sample_ref (sample);
ctx->callback = callback;
ctx->user_data = user_data;
ctx->destroy_notify = destroy_notify;
ctx->context = g_main_context_ref (context);
ctx->finished = FALSE;
pipeline =
build_convert_frame_pipeline (&src, &sink, from_caps,
gst_buffer_get_video_crop_meta (buf), to_caps_copy, &error);
if (!pipeline)
goto no_pipeline;
ctx->pipeline = pipeline;
bus = gst_element_get_bus (pipeline);
if (timeout != GST_CLOCK_TIME_NONE) {
ctx->timeout_source = g_timeout_source_new (timeout / GST_MSECOND);
g_source_set_callback (ctx->timeout_source,
(GSourceFunc) convert_frame_timeout_callback,
gst_video_convert_frame_context_ref (ctx),
(GDestroyNotify) gst_video_convert_frame_context_unref);
g_source_attach (ctx->timeout_source, context);
}
g_signal_connect_data (src, "need-data",
G_CALLBACK (convert_frame_need_data_callback),
gst_video_convert_frame_context_ref (ctx),
(GClosureNotify) gst_video_convert_frame_context_unref, 0);
g_signal_connect_data (sink, "new-preroll",
G_CALLBACK (convert_frame_new_preroll_callback),
gst_video_convert_frame_context_ref (ctx),
(GClosureNotify) gst_video_convert_frame_context_unref, 0);
source = gst_bus_create_watch (bus);
g_source_set_callback (source, (GSourceFunc) convert_frame_bus_callback,
gst_video_convert_frame_context_ref (ctx),
(GDestroyNotify) gst_video_convert_frame_context_unref);
g_source_attach (source, context);
g_source_unref (source);
gst_object_unref (bus);
if (gst_element_set_state (pipeline,
GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE)
goto state_change_failed;
gst_caps_unref (to_caps_copy);
gst_video_convert_frame_context_unref (ctx);
return;
/* ERRORS */
no_pipeline:
{
gst_caps_unref (to_caps_copy);
g_mutex_lock (&ctx->mutex);
convert_frame_finish (ctx, NULL, error);
g_mutex_unlock (&ctx->mutex);
gst_video_convert_frame_context_unref (ctx);
return;
}
state_change_failed:
{
gst_caps_unref (to_caps_copy);
error = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_STATE_CHANGE,
"failed to change state to PLAYING");
g_mutex_lock (&ctx->mutex);
convert_frame_finish (ctx, NULL, error);
g_mutex_unlock (&ctx->mutex);
gst_video_convert_frame_context_unref (ctx);
return;
}
}