gstreamer/ext/mimic/gstmimenc.c
2012-06-20 10:40:42 +02:00

623 lines
18 KiB
C

/*
* GStreamer
* Copyright (c) 2005 INdT.
* Copyright (c) 2009 Collabora Ltd.
* @author Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
* @author Philippe Khalaf <burger@speedy.org>
* @author Olivier Crête <olivier.crete@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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-mimenc
* @see_also: mimdec
*
* The MIMIC codec is used by MSN Messenger's webcam support. It creates the
* TCP header for the MIMIC codec.
*
* When using it to communicate directly with MSN Messenger, if the sender
* wants to stop sending, he has to send a special buffer every 4 seconds.
* When the "paused-mode" property is set to TRUE, if the element receives no
* buffer on its sink pad for 4 seconds, it will produced a special paused
* frame and will continue doing so every 4 seconds until a new buffer is
*u received on its sink pad.
*
* Its fourcc is ML20.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "gstmimenc.h"
GST_DEBUG_CATEGORY (mimenc_debug);
#define GST_CAT_DEFAULT (mimenc_debug)
#define MAX_INTERFRAMES 15
#define TCP_HEADER_SIZE 24
#define PAUSED_MODE_INTERVAL (4 * GST_SECOND)
enum
{
PROP_0,
PROP_PAUSED_MODE,
PROP_LAST
};
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-rgb, "
"bpp = (int) 24, "
"depth = (int) 24, "
"endianness = (int) 4321, "
"framerate = (fraction) [1/1, 30/1], "
"red_mask = (int) 16711680, "
"green_mask = (int) 65280, "
"blue_mask = (int) 255, "
"width = (int) 320, "
"height = (int) 240"
";video/x-raw-rgb, "
"bpp = (int) 24, "
"depth = (int) 24, "
"endianness = (int) 4321, "
"framerate = (fraction) [1/1, 30/1], "
"red_mask = (int) 16711680, "
"green_mask = (int) 65280, "
"blue_mask = (int) 255, " "width = (int) 160, " "height = (int) 120")
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-mimic")
);
static gboolean gst_mim_enc_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_mim_enc_chain (GstPad * pad, GstBuffer * in);
static void gst_mim_enc_create_tcp_header (GstMimEnc * mimenc, GstBuffer * buf,
guint32 payload_size, gboolean keyframe, gboolean paused);
static gboolean gst_mim_enc_event (GstPad * pad, GstEvent * event);
static GstStateChangeReturn
gst_mim_enc_change_state (GstElement * element, GstStateChange transition);
static void gst_mim_enc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mim_enc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
GST_BOILERPLATE (GstMimEnc, gst_mim_enc, GstElement, GST_TYPE_ELEMENT);
static void
gst_mim_enc_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_mim_enc_set_property;
gobject_class->get_property = gst_mim_enc_get_property;
g_object_class_install_property (gobject_class, PROP_PAUSED_MODE,
g_param_spec_boolean ("paused-mode", "Paused mode",
"If enabled, empty frames will be generated every 4 seconds"
" when no data is received",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details_simple (element_class,
"Mimic Encoder",
"Codec/Encoder/Video",
"MSN Messenger compatible Mimic video encoder element",
"Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>,"
"Olivier Crête <olivier.crete@collabora.co.uk");
}
static void
gst_mim_enc_class_init (GstMimEncClass * klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_mim_enc_change_state);
GST_DEBUG_CATEGORY_INIT (mimenc_debug, "mimenc", 0, "Mimic encoder plugin");
}
static void
gst_mim_enc_init (GstMimEnc * mimenc, GstMimEncClass * klass)
{
mimenc->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
gst_element_add_pad (GST_ELEMENT (mimenc), mimenc->sinkpad);
gst_pad_set_setcaps_function (mimenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_mim_enc_setcaps));
gst_pad_set_chain_function (mimenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_mim_enc_chain));
gst_pad_set_event_function (mimenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_mim_enc_event));
mimenc->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
gst_element_add_pad (GST_ELEMENT (mimenc), mimenc->srcpad);
mimenc->enc = NULL;
gst_segment_init (&mimenc->segment, GST_FORMAT_UNDEFINED);
mimenc->res = MIMIC_RES_HIGH;
mimenc->buffer_size = -1;
mimenc->width = 0;
mimenc->height = 0;
mimenc->frames = 0;
}
static void
gst_mim_enc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMimEnc *mimenc = GST_MIM_ENC (object);
switch (prop_id) {
case PROP_PAUSED_MODE:
GST_OBJECT_LOCK (mimenc);
mimenc->paused_mode = g_value_get_boolean (value);
if (GST_STATE (object) == GST_STATE_PLAYING)
GST_WARNING_OBJECT (object, "Tried to disable paused-mode in a playing"
" encoder, it will not be stopped until it is paused");
GST_OBJECT_UNLOCK (mimenc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mim_enc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstMimEnc *mimenc = GST_MIM_ENC (object);
switch (prop_id) {
case PROP_PAUSED_MODE:
GST_OBJECT_LOCK (mimenc);
g_value_set_boolean (value, mimenc->paused_mode);
GST_OBJECT_UNLOCK (mimenc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_mim_enc_setcaps (GstPad * pad, GstCaps * caps)
{
GstMimEnc *mimenc;
GstStructure *structure;
int ret = TRUE, height, width;
mimenc = GST_MIM_ENC (gst_pad_get_parent (pad));
g_return_val_if_fail (mimenc != NULL, FALSE);
g_return_val_if_fail (GST_IS_MIM_ENC (mimenc), FALSE);
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "width", &width);
if (!ret) {
GST_DEBUG_OBJECT (mimenc, "No width set");
goto out;
}
ret = gst_structure_get_int (structure, "height", &height);
if (!ret) {
GST_DEBUG_OBJECT (mimenc, "No height set");
goto out;
}
GST_OBJECT_LOCK (mimenc);
if (width == 320 && height == 240)
mimenc->res = MIMIC_RES_HIGH;
else if (width == 160 && height == 120)
mimenc->res = MIMIC_RES_LOW;
else {
GST_WARNING_OBJECT (mimenc, "Invalid resolution %dx%d", width, height);
ret = FALSE;
GST_OBJECT_UNLOCK (mimenc);
goto out;
}
mimenc->width = (guint16) width;
mimenc->height = (guint16) height;
GST_DEBUG_OBJECT (mimenc, "Got info from caps w : %d, h : %d",
mimenc->width, mimenc->height);
if (!mimic_encoder_init (mimenc->enc, mimenc->res)) {
GST_ERROR_OBJECT (mimenc, "mimic_encoder_init error");
ret = FALSE;
GST_OBJECT_UNLOCK (mimenc);
goto out;
}
if (!mimic_get_property (mimenc->enc, "buffer_size", &mimenc->buffer_size)) {
GST_ERROR_OBJECT (mimenc, "mimic_get_property(buffer_size) error");
ret = FALSE;
}
GST_OBJECT_UNLOCK (mimenc);
out:
gst_object_unref (mimenc);
return ret;
}
static GstFlowReturn
gst_mim_enc_chain (GstPad * pad, GstBuffer * in)
{
GstMimEnc *mimenc;
GstBuffer *out_buf = NULL, *buf = NULL;
guchar *data;
gint buffer_size;
GstFlowReturn res = GST_FLOW_OK;
GstEvent *event = NULL;
gboolean keyframe;
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
mimenc = GST_MIM_ENC (gst_pad_get_parent (pad));
g_return_val_if_fail (GST_IS_MIM_ENC (mimenc), GST_FLOW_ERROR);
GST_OBJECT_LOCK (mimenc);
if (mimenc->segment.format == GST_FORMAT_UNDEFINED) {
GST_WARNING_OBJECT (mimenc, "No new-segment received,"
" initializing segment with time 0..-1");
gst_segment_init (&mimenc->segment, GST_FORMAT_TIME);
gst_segment_set_newsegment (&mimenc->segment,
FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0);
}
if (mimenc->enc == NULL) {
}
buf = in;
data = GST_BUFFER_DATA (buf);
out_buf = gst_buffer_new_and_alloc (mimenc->buffer_size + TCP_HEADER_SIZE);
GST_BUFFER_TIMESTAMP (out_buf) =
gst_segment_to_running_time (&mimenc->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buf));
mimenc->last_buffer = GST_BUFFER_TIMESTAMP (out_buf);
buffer_size = mimenc->buffer_size;
keyframe = (mimenc->frames % MAX_INTERFRAMES) == 0 ? TRUE : FALSE;
if (!mimic_encode_frame (mimenc->enc, data,
GST_BUFFER_DATA (out_buf) + TCP_HEADER_SIZE, &buffer_size,
keyframe)) {
gst_buffer_unref (out_buf);
gst_buffer_unref (buf);
GST_ELEMENT_ERROR (mimenc, STREAM, ENCODE, (NULL),
("mimic_encode_frame error"));
res = GST_FLOW_ERROR;
goto out_unlock;
}
if (!keyframe)
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
GST_BUFFER_SIZE (out_buf) = buffer_size + TCP_HEADER_SIZE;
GST_LOG_OBJECT (mimenc, "incoming buf size %d, encoded size %d",
GST_BUFFER_SIZE (buf), GST_BUFFER_SIZE (out_buf));
++mimenc->frames;
/* now let's create that tcp header */
gst_mim_enc_create_tcp_header (mimenc, out_buf, buffer_size, keyframe, FALSE);
if (mimenc->need_newsegment) {
event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0);
mimenc->need_newsegment = FALSE;
}
GST_OBJECT_UNLOCK (mimenc);
if (event) {
if (!gst_pad_push_event (mimenc->srcpad, event))
GST_WARNING_OBJECT (mimenc, "Failed to push NEWSEGMENT event");
}
res = gst_pad_push (mimenc->srcpad, out_buf);
out:
if (buf)
gst_buffer_unref (buf);
gst_object_unref (mimenc);
return res;
out_unlock:
GST_OBJECT_UNLOCK (mimenc);
goto out;
}
static void
gst_mim_enc_create_tcp_header (GstMimEnc * mimenc, GstBuffer * buf,
guint32 payload_size, gboolean keyframe, gboolean paused)
{
/* 24 bytes */
guchar *p = (guchar *) GST_BUFFER_DATA (buf);
p[0] = 24;
p[1] = paused ? 1 : 0;
GST_WRITE_UINT16_LE (p + 2, mimenc->width);
GST_WRITE_UINT16_LE (p + 4, mimenc->height);
GST_WRITE_UINT16_LE (p + 6, keyframe ? 1 : 0);
GST_WRITE_UINT32_LE (p + 8, payload_size);
GST_WRITE_UINT32_LE (p + 12, paused ? 0 :
GST_MAKE_FOURCC ('M', 'L', '2', '0'));
GST_WRITE_UINT32_LE (p + 16, 0);
GST_WRITE_UINT32_LE (p + 20, GST_BUFFER_TIMESTAMP (buf) / GST_MSECOND);
}
static gboolean
gst_mim_enc_event (GstPad * pad, GstEvent * event)
{
GstMimEnc *mimenc = GST_MIM_ENC (gst_pad_get_parent (pad));
gboolean ret = TRUE;
gboolean forward = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gboolean update;
gst_event_parse_new_segment_full (event, &update, &rate, &arate,
&format, &start, &stop, &time);
/* we need time for now */
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
GST_DEBUG_OBJECT (mimenc,
"newsegment: update %d, rate %g, arate %g, start %" GST_TIME_FORMAT
", stop %" GST_TIME_FORMAT ", time %" GST_TIME_FORMAT,
update, rate, arate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop),
GST_TIME_ARGS (time));
/* now configure the values, we need these to time the release of the
* buffers on the srcpad. */
GST_OBJECT_LOCK (mimenc);
gst_segment_set_newsegment_full (&mimenc->segment, update,
rate, arate, format, start, stop, time);
GST_OBJECT_UNLOCK (mimenc);
forward = FALSE;
break;
}
break;
case GST_EVENT_FLUSH_STOP:
GST_OBJECT_LOCK (mimenc);
gst_segment_init (&mimenc->segment, GST_FORMAT_UNDEFINED);
mimenc->need_newsegment = TRUE;
GST_OBJECT_UNLOCK (mimenc);
break;
default:
break;
}
if (forward)
ret = gst_pad_push_event (mimenc->srcpad, event);
else
gst_event_unref (event);
done:
gst_object_unref (mimenc);
return ret;
newseg_wrong_format:
{
GST_DEBUG_OBJECT (mimenc, "received non TIME newsegment");
gst_event_unref (event);
ret = FALSE;
goto done;
}
}
static void
paused_mode_task (gpointer data)
{
GstMimEnc *mimenc = GST_MIM_ENC (data);
GstClockTime now;
GstClockTimeDiff diff;
GstFlowReturn ret;
GST_OBJECT_LOCK (mimenc);
if (!GST_ELEMENT_CLOCK (mimenc)) {
GST_OBJECT_UNLOCK (mimenc);
GST_ERROR_OBJECT (mimenc, "Element has no clock");
gst_pad_pause_task (mimenc->srcpad);
return;
}
if (mimenc->stop_paused_mode) {
GST_OBJECT_UNLOCK (mimenc);
goto stop_task;
}
now = gst_clock_get_time (GST_ELEMENT_CLOCK (mimenc));
diff = now - GST_ELEMENT_CAST (mimenc)->base_time - mimenc->last_buffer;
if (diff < 0)
diff = 0;
if (diff > 3.95 * GST_SECOND) {
GstBuffer *buffer;
GstEvent *event = NULL;
buffer = gst_buffer_new_and_alloc (TCP_HEADER_SIZE);
GST_BUFFER_TIMESTAMP (buffer) = mimenc->last_buffer + PAUSED_MODE_INTERVAL;
gst_mim_enc_create_tcp_header (mimenc, buffer, 0, FALSE, TRUE);
mimenc->last_buffer += PAUSED_MODE_INTERVAL;
if (mimenc->need_newsegment) {
event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0);
mimenc->need_newsegment = FALSE;
}
GST_OBJECT_UNLOCK (mimenc);
GST_LOG_OBJECT (mimenc, "Haven't had an incoming buffer in 4 seconds,"
" sending out a pause frame");
if (event) {
if (!gst_pad_push_event (mimenc->srcpad, event))
GST_WARNING_OBJECT (mimenc, "Failed to push NEWSEGMENT event");
}
ret = gst_pad_push (mimenc->srcpad, buffer);
if (ret < 0) {
GST_WARNING_OBJECT (mimenc, "Error pushing paused header: %s",
gst_flow_get_name (ret));
goto stop_task;
}
} else {
GstClockTime next_stop;
GstClockID id;
next_stop = now + (PAUSED_MODE_INTERVAL - MIN (diff, PAUSED_MODE_INTERVAL));
id = gst_clock_new_single_shot_id (GST_ELEMENT_CLOCK (mimenc), next_stop);
if (mimenc->stop_paused_mode) {
GST_OBJECT_UNLOCK (mimenc);
goto stop_task;
}
mimenc->clock_id = id;
GST_OBJECT_UNLOCK (mimenc);
gst_clock_id_wait (id, NULL);
GST_OBJECT_LOCK (mimenc);
mimenc->clock_id = NULL;
GST_OBJECT_UNLOCK (mimenc);
gst_clock_id_unref (id);
}
return;
stop_task:
gst_pad_pause_task (mimenc->srcpad);
}
static GstStateChangeReturn
gst_mim_enc_change_state (GstElement * element, GstStateChange transition)
{
GstMimEnc *mimenc = GST_MIM_ENC (element);
GstStateChangeReturn ret;
gboolean paused_mode;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
mimenc->enc = mimic_open ();
if (!mimenc) {
GST_ERROR_OBJECT (mimenc, "mimic_open failed");
return GST_STATE_CHANGE_FAILURE;
}
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_OBJECT_LOCK (mimenc);
gst_segment_init (&mimenc->segment, GST_FORMAT_UNDEFINED);
mimenc->last_buffer = GST_CLOCK_TIME_NONE;
mimenc->need_newsegment = TRUE;
GST_OBJECT_UNLOCK (mimenc);
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_OBJECT_LOCK (mimenc);
if (mimenc->clock_id)
gst_clock_id_unschedule (mimenc->clock_id);
mimenc->stop_paused_mode = TRUE;
GST_OBJECT_UNLOCK (mimenc);
gst_pad_pause_task (mimenc->srcpad);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_OBJECT_LOCK (mimenc);
mimenc->stop_paused_mode = FALSE;
paused_mode = mimenc->paused_mode;
if (paused_mode) {
if (!GST_ELEMENT_CLOCK (mimenc)) {
GST_OBJECT_UNLOCK (mimenc);
GST_ELEMENT_ERROR (mimenc, RESOURCE, FAILED,
("Using paused-mode requires a clock, but no clock was provided"
" to the element"), (NULL));
return GST_STATE_CHANGE_FAILURE;
}
if (mimenc->last_buffer == GST_CLOCK_TIME_NONE)
mimenc->last_buffer = gst_clock_get_time (GST_ELEMENT_CLOCK (mimenc))
- GST_ELEMENT_CAST (mimenc)->base_time;
}
GST_OBJECT_UNLOCK (mimenc);
if (paused_mode) {
if (!gst_pad_start_task (mimenc->srcpad, paused_mode_task, mimenc,
NULL)) {
ret = GST_STATE_CHANGE_FAILURE;
GST_ERROR_OBJECT (mimenc, "Can not start task");
}
}
break;
case GST_STATE_CHANGE_READY_TO_NULL:
GST_OBJECT_LOCK (element);
if (mimenc->enc != NULL) {
mimic_close (mimenc->enc);
mimenc->enc = NULL;
mimenc->buffer_size = -1;
mimenc->frames = 0;
}
GST_OBJECT_UNLOCK (element);
break;
default:
break;
}
return ret;
}