From 6407101c5386f96a7d8183b9cb8354f6952681c1 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Sebastian=20Dr=C3=B6ge?= Date: Tue, 14 Sep 2010 08:39:20 +0200 Subject: [PATCH] video: Add async variant of the convert frame function API: gst_video_convert_frame_async() --- gst-libs/gst/video/convertframe.c | 330 ++++++++++++++++++++++++++++++++++++++ gst-libs/gst/video/video.h | 5 + 2 files changed, 335 insertions(+) diff --git a/gst-libs/gst/video/convertframe.c b/gst-libs/gst/video/convertframe.c index 8eb7344..fe3b672 100644 --- a/gst-libs/gst/video/convertframe.c +++ b/gst-libs/gst/video/convertframe.c @@ -168,6 +168,9 @@ build_convert_frame_pipeline (GstElement ** src_element, 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; @@ -242,6 +245,9 @@ link_failed: * * Returns: The converted #GstBuffer, or %NULL if an error happened (in which case @err * will point to the #GError). + * + * Since: 0.10.31 + * */ GstBuffer * gst_video_convert_frame (GstBuffer * buf, const GstCaps * to_caps, @@ -356,3 +362,327 @@ no_pipeline: return NULL; } } + +typedef struct +{ + GMutex *mutex; + GstElement *pipeline; + GstVideoConvertFrameCallback callback; + gpointer user_data; + GMainContext *context; + GstBuffer *buffer; + gulong timeout_id; + gboolean finished; +} GstVideoConvertFrameContext; + +typedef struct +{ + GstVideoConvertFrameCallback callback; + GstBuffer *buffer; + GError *error; + gpointer user_data; + + GstVideoConvertFrameContext *context; +} GstVideoConvertFrameCallbackContext; + +static void +gst_video_convert_frame_context_free (GstVideoConvertFrameContext * ctx) +{ + /* Wait until all users of the mutex are done */ + g_mutex_lock (ctx->mutex); + g_mutex_unlock (ctx->mutex); + g_mutex_free (ctx->mutex); + if (ctx->timeout_id) + g_source_remove (ctx->timeout_id); + if (ctx->buffer) + gst_buffer_unref (ctx->buffer); + g_main_context_unref (ctx->context); + + gst_element_set_state (ctx->pipeline, GST_STATE_NULL); + gst_object_unref (ctx->pipeline); + + g_slice_free (GstVideoConvertFrameContext, ctx); +} + +static void + gst_video_convert_frame_callback_context_free + (GstVideoConvertFrameCallbackContext * ctx) +{ + if (ctx->context) + gst_video_convert_frame_context_free (ctx->context); + g_slice_free (GstVideoConvertFrameCallbackContext, ctx); +} + +static gboolean +convert_frame_dispatch_callback (GstVideoConvertFrameCallbackContext * ctx) +{ + ctx->callback (ctx->buffer, ctx->error, ctx->user_data); + + return FALSE; +} + +static void +convert_frame_finish (GstVideoConvertFrameContext * context, GstBuffer * buffer, + GError * error) +{ + GSource *source; + GstVideoConvertFrameCallbackContext *ctx; + + if (context->timeout_id) + g_source_remove (context->timeout_id); + context->timeout_id = 0; + + ctx = g_slice_new (GstVideoConvertFrameCallbackContext); + ctx->callback = context->callback; + ctx->user_data = context->user_data; + ctx->buffer = buffer; + ctx->error = error; + ctx->context = context; + + source = g_timeout_source_new (0); + g_source_set_callback (source, + (GSourceFunc) convert_frame_dispatch_callback, ctx, + (GDestroyNotify) gst_video_convert_frame_callback_context_free); + g_source_attach (source, context->context); + g_source_unref (source); + + context->finished = TRUE; +} + +static gboolean +convert_frame_timeout_callback (GstVideoConvertFrameContext * context) +{ + GError *error; + + 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: + g_mutex_unlock (context->mutex); + return FALSE; +} + +static gboolean +convert_frame_bus_callback (GstBus * bus, GstMessage * message, + GstVideoConvertFrameContext * context) +{ + 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: + g_mutex_unlock (context->mutex); + + return FALSE; +} + +static void +convert_frame_need_data_callback (GstElement * src, guint size, + GstVideoConvertFrameContext * context) +{ + GstFlowReturn ret = GST_FLOW_ERROR; + GError *error; + + g_mutex_lock (context->mutex); + + if (context->finished) + goto done; + + g_signal_emit_by_name (src, "push-buffer", context->buffer, &ret); + gst_buffer_unref (context->buffer); + context->buffer = 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); + } + + g_signal_handlers_disconnect_by_func (src, convert_frame_need_data_callback, + context); + +done: + g_mutex_unlock (context->mutex); +} + +static void +convert_frame_new_buffer_callback (GstElement * sink, + GstVideoConvertFrameContext * context) +{ + GstBuffer *buf = NULL; + GError *error = NULL; + + g_mutex_lock (context->mutex); + + if (context->finished) + goto done; + + g_signal_emit_by_name (sink, "pull-preroll", &buf); + + if (!buf) { + error = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED, + "Could not get converted video frame"); + } + + convert_frame_finish (context, buf, error); + + g_signal_handlers_disconnect_by_func (sink, convert_frame_need_data_callback, + context); + +done: + g_mutex_unlock (context->mutex); +} + +/** + * gst_video_convert_frame_async: + * @buf: a #GstBuffer + * @to_caps: the #GstCaps to convert to + * @timeout: the maximum amount of time allowed for the processing. + * @callback: %GstVideoConvertFrameCallback that will be called after conversion. + * + * 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. + * + * Since: 0.10.31 + * + */ +void +gst_video_convert_frame_async (GstBuffer * buf, const GstCaps * to_caps, + GstClockTime timeout, GstVideoConvertFrameCallback callback, + gpointer user_data) +{ + GMainContext *context = NULL; + GError *error = NULL; + GstBus *bus; + GstCaps *from_caps, *to_caps_copy = NULL; + GstElement *pipeline, *src, *sink; + guint i, n; + GSource *source; + GstVideoConvertFrameContext *ctx; + + g_return_if_fail (buf != NULL); + g_return_if_fail (to_caps != NULL); + g_return_if_fail (GST_BUFFER_CAPS (buf) != NULL); + +#if GLIB_CHECK_VERSION(2,22,0) + context = g_main_context_get_thread_default (); +#endif + if (!context) + context = g_main_context_default (); + + from_caps = GST_BUFFER_CAPS (buf); + + 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, to_caps_copy, + &error); + if (!pipeline) + goto no_pipeline; + + bus = gst_element_get_bus (pipeline); + + ctx = g_slice_new0 (GstVideoConvertFrameContext); + ctx->mutex = g_mutex_new (); + ctx->buffer = gst_buffer_ref (buf); + ctx->callback = callback; + ctx->user_data = user_data; + ctx->context = g_main_context_ref (context); + ctx->finished = FALSE; + ctx->pipeline = pipeline; + + if (timeout != GST_CLOCK_TIME_NONE) { + source = g_timeout_source_new (timeout / GST_MSECOND); + g_source_set_callback (source, + (GSourceFunc) convert_frame_timeout_callback, ctx, NULL); + ctx->timeout_id = g_source_attach (source, context); + g_source_unref (source); + } + + g_signal_connect (src, "need-data", + G_CALLBACK (convert_frame_need_data_callback), ctx); + g_signal_connect (sink, "new-preroll", + G_CALLBACK (convert_frame_new_buffer_callback), ctx); + + source = gst_bus_create_watch (bus); + g_source_set_callback (source, (GSourceFunc) convert_frame_bus_callback, + ctx, NULL); + g_source_attach (source, context); + g_source_unref (source); + + gst_element_set_state (pipeline, GST_STATE_PLAYING); + + gst_object_unref (bus); + gst_caps_unref (to_caps_copy); + + return; + /* ERRORS */ +no_pipeline: + { + GstVideoConvertFrameCallbackContext *ctx; + GSource *source; + + gst_caps_unref (to_caps_copy); + + ctx = g_slice_new0 (GstVideoConvertFrameCallbackContext); + ctx->callback = callback; + ctx->user_data = user_data; + ctx->buffer = NULL; + ctx->error = error; + + source = g_timeout_source_new (0); + g_source_set_callback (source, + (GSourceFunc) convert_frame_dispatch_callback, ctx, + (GDestroyNotify) gst_video_convert_frame_callback_context_free); + g_source_attach (source, context); + g_source_unref (source); + } +} diff --git a/gst-libs/gst/video/video.h b/gst-libs/gst/video/video.h index 2055057..393b92a 100644 --- a/gst-libs/gst/video/video.h +++ b/gst-libs/gst/video/video.h @@ -416,6 +416,11 @@ gboolean gst_video_event_parse_still_frame (GstEvent *event, gboolean *in_still) GstBuffer *gst_video_convert_frame(GstBuffer *buf, const GstCaps *to_caps, GstClockTime timeout, GError **error); +typedef void (*GstVideoConvertFrameCallback) (GstBuffer *buf, GError *error, gpointer user_data); +void gst_video_convert_frame_async(GstBuffer *buf, const GstCaps *to_caps, + GstClockTime timeout, GstVideoConvertFrameCallback callback, + gpointer user_data); + G_END_DECLS #endif /* __GST_VIDEO_H__ */ -- 2.7.4