gstreamer/ext/mimic/gstmimenc.c

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/*
* GStreamer
* Copyright (c) 2005 INdT.
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* Copyright (c) 2009 Collabora Ltd.
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* @author Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
* @author Philippe Khalaf <burger@speedy.org>
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* @author Olivier Crête <olivier.crete@collabora.co.uk>
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*
* 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.
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*/
/**
* 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.
*
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* 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.
*
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* 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
};
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-raw, format = (string) \"RGB\", "
"framerate = (fraction) [1/1, 30/1], "
"width = (int) 320, "
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"height = (int) 240;"
"video/x-raw, format = (string) \"RGB\", "
"framerate = (fraction) [1/1, 30/1], "
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"width = (int) 160, " "height = (int) 120")
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);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-mimic")
);
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static gboolean gst_mim_enc_setcaps (GstMimEnc * mimenc, GstCaps * caps);
static GstFlowReturn gst_mim_enc_chain (GstPad * pad, GstObject * parent,
GstBuffer * in);
static void gst_mim_enc_create_tcp_header (GstMimEnc * mimenc, guint8 * p,
guint32 payload_size, GstClockTime ts, gboolean keyframe, gboolean paused);
static gboolean gst_mim_enc_event (GstPad * pad, GstObject * parent,
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);
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G_DEFINE_TYPE (GstMimEnc, gst_mim_enc, GST_TYPE_ELEMENT);
static void
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gst_mim_enc_class_init (GstMimEncClass * klass)
{
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GstElementClass *gstelement_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;
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gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_mim_enc_change_state);
GST_DEBUG_CATEGORY_INIT (mimenc_debug, "mimenc", 0, "Mimic encoder plugin");
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_static_pad_template (gstelement_class, &src_factory);
gst_element_class_add_static_pad_template (gstelement_class, &sink_factory);
gst_element_class_set_static_metadata (gstelement_class,
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"Mimic Encoder",
"Codec/Encoder/Video",
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"MSN Messenger compatible Mimic video encoder element",
"Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>,"
"Olivier Crête <olivier.crete@collabora.co.uk");
}
static void
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gst_mim_enc_init (GstMimEnc * mimenc)
{
mimenc->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
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));
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gst_element_add_pad (GST_ELEMENT (mimenc), mimenc->sinkpad);
mimenc->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
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gst_pad_use_fixed_caps (mimenc->srcpad);
gst_element_add_pad (GST_ELEMENT (mimenc), mimenc->srcpad);
mimenc->enc = NULL;
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gst_segment_init (&mimenc->segment, GST_FORMAT_TIME);
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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;
}
}
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static void
gst_mim_enc_reset_locked (GstMimEnc * mimenc)
{
if (mimenc->enc != NULL) {
mimic_close (mimenc->enc);
mimenc->enc = NULL;
mimenc->buffer_size = -1;
mimenc->frames = 0;
mimenc->width = 0;
mimenc->height = 0;
}
gst_event_replace (&mimenc->pending_segment, NULL);
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}
static void
gst_mim_enc_reset (GstMimEnc * mimenc)
{
GST_OBJECT_LOCK (mimenc);
gst_mim_enc_reset_locked (mimenc);
GST_OBJECT_UNLOCK (mimenc);
}
static gboolean
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gst_mim_enc_setcaps (GstMimEnc * mimenc, GstCaps * caps)
{
GstStructure *structure;
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int height, width;
gboolean ret = FALSE;
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "width", &width)) {
GST_DEBUG_OBJECT (mimenc, "No width set");
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return FALSE;
}
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if (!gst_structure_get_int (structure, "height", &height)) {
GST_DEBUG_OBJECT (mimenc, "No height set");
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return FALSE;
}
GST_OBJECT_LOCK (mimenc);
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if (mimenc->width == width && mimenc->height == height) {
ret = TRUE;
goto out;
}
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);
goto out;
}
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gst_mim_enc_reset_locked (mimenc);
mimenc->width = (guint16) width;
mimenc->height = (guint16) height;
GST_DEBUG_OBJECT (mimenc, "Got info from caps w : %d, h : %d",
mimenc->width, mimenc->height);
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mimenc->enc = mimic_open ();
if (!mimenc->enc) {
GST_ERROR_OBJECT (mimenc, "mimic_open failed");
goto out;
}
if (!mimic_encoder_init (mimenc->enc, mimenc->res)) {
GST_ERROR_OBJECT (mimenc, "mimic_encoder_init error");
goto out;
}
if (!mimic_get_property (mimenc->enc, "buffer_size", &mimenc->buffer_size)) {
GST_ERROR_OBJECT (mimenc, "mimic_get_property(buffer_size) error");
}
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ret = TRUE;
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out:
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GST_OBJECT_UNLOCK (mimenc);
return ret;
}
static GstFlowReturn
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gst_mim_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * in)
{
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GstMimEnc *mimenc = GST_MIM_ENC (parent);
GstBuffer *out = NULL;
GstMapInfo in_map;
GstMapInfo out_map;
GstFlowReturn res = GST_FLOW_OK;
gboolean keyframe;
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gint buffer_size;
GST_OBJECT_LOCK (mimenc);
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gst_buffer_map (in, &in_map, GST_MAP_READ);
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out = gst_buffer_new_and_alloc (mimenc->buffer_size + TCP_HEADER_SIZE);
gst_buffer_map (out, &out_map, GST_MAP_READWRITE);
GST_BUFFER_TIMESTAMP (out) =
gst_segment_to_running_time (&mimenc->segment, GST_FORMAT_TIME,
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GST_BUFFER_TIMESTAMP (in));
mimenc->last_buffer = GST_BUFFER_TIMESTAMP (out);
buffer_size = mimenc->buffer_size;
keyframe = (mimenc->frames % MAX_INTERFRAMES) == 0 ? TRUE : FALSE;
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if (!mimic_encode_frame (mimenc->enc, in_map.data,
out_map.data + TCP_HEADER_SIZE, &buffer_size, keyframe)) {
gst_buffer_unmap (in, &in_map);
gst_buffer_unmap (out, &out_map);
gst_buffer_unref (out);
GST_ELEMENT_ERROR (mimenc, STREAM, ENCODE, (NULL),
("mimic_encode_frame error"));
res = GST_FLOW_ERROR;
goto out_unlock;
}
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gst_buffer_unmap (in, &in_map);
if (!keyframe)
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GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DELTA_UNIT);
GST_LOG_OBJECT (mimenc, "incoming buf size %" G_GSIZE_FORMAT
", encoded size %" G_GSIZE_FORMAT, gst_buffer_get_size (in),
gst_buffer_get_size (out));
++mimenc->frames;
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/* now let's create that tcp header */
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gst_mim_enc_create_tcp_header (mimenc, out_map.data, buffer_size,
GST_BUFFER_TIMESTAMP (out), keyframe, FALSE);
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gst_buffer_unmap (out, &out_map);
gst_buffer_resize (out, 0, buffer_size + TCP_HEADER_SIZE);
if (G_UNLIKELY (mimenc->pending_segment)) {
gst_pad_push_event (mimenc->srcpad, mimenc->pending_segment);
mimenc->pending_segment = FALSE;
}
GST_OBJECT_UNLOCK (mimenc);
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res = gst_pad_push (mimenc->srcpad, out);
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out:
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gst_buffer_unref (in);
return res;
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out_unlock:
GST_OBJECT_UNLOCK (mimenc);
goto out;
}
static void
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gst_mim_enc_create_tcp_header (GstMimEnc * mimenc, guint8 * p,
guint32 payload_size, GstClockTime ts, gboolean keyframe, gboolean paused)
{
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p[0] = 24;
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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);
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GST_WRITE_UINT32_LE (p + 12, paused ? 0 :
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GST_MAKE_FOURCC ('M', 'L', '2', '0'));
GST_WRITE_UINT32_LE (p + 16, 0);
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GST_WRITE_UINT32_LE (p + 20, ts / GST_MSECOND);
}
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static gboolean
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gst_mim_enc_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstMimEnc *mimenc = GST_MIM_ENC (parent);
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gboolean ret = TRUE;
gboolean forward = TRUE;
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switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_segment_init (&mimenc->segment, GST_FORMAT_UNDEFINED);
gst_event_replace (&mimenc->pending_segment, NULL);
break;
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case GST_EVENT_EOS:
gst_mim_enc_reset (mimenc);
break;
case GST_EVENT_CAPS:
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{
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GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_mim_enc_setcaps (mimenc, caps);
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forward = FALSE;
break;
}
case GST_EVENT_SEGMENT:
{
gst_event_copy_segment (event, &mimenc->segment);
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/* we need time for now */
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if (mimenc->segment.format != GST_FORMAT_TIME)
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goto newseg_wrong_format;
gst_event_replace (&mimenc->pending_segment, event);
forward = FALSE;
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break;
}
break;
default:
break;
}
if (forward)
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ret = gst_pad_event_default (pad, parent, event);
else
gst_event_unref (event);
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done:
return ret;
newseg_wrong_format:
{
GST_DEBUG_OBJECT (mimenc, "received non TIME newsegment");
gst_event_unref (event);
ret = FALSE;
goto done;
}
}
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static void
paused_mode_task (gpointer data)
{
GstMimEnc *mimenc = GST_MIM_ENC (data);
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GstClockTime now;
GstClockTimeDiff diff;
GstFlowReturn ret;
GST_OBJECT_LOCK (mimenc);
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if (!GST_ELEMENT_CLOCK (mimenc)) {
GST_OBJECT_UNLOCK (mimenc);
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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;
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GstMapInfo out_map;
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buffer = gst_buffer_new_and_alloc (TCP_HEADER_SIZE);
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gst_buffer_map (buffer, &out_map, GST_MAP_WRITE);
GST_BUFFER_TIMESTAMP (buffer) = mimenc->last_buffer + PAUSED_MODE_INTERVAL;
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gst_mim_enc_create_tcp_header (mimenc, out_map.data, 0,
GST_BUFFER_TIMESTAMP (buffer), FALSE, TRUE);
gst_buffer_unmap (buffer, &out_map);
mimenc->last_buffer += PAUSED_MODE_INTERVAL;
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GST_OBJECT_UNLOCK (mimenc);
GST_LOG_OBJECT (mimenc, "Haven't had an incoming buffer in 4 seconds,"
" sending out a pause frame");
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));
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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);
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gst_clock_id_unref (id);
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}
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);
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GstStateChangeReturn ret;
gboolean paused_mode;
switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_OBJECT_LOCK (mimenc);
gst_segment_init (&mimenc->segment, GST_FORMAT_UNDEFINED);
gst_event_replace (&mimenc->pending_segment, NULL);
mimenc->last_buffer = GST_CLOCK_TIME_NONE;
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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;
}
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ret = GST_ELEMENT_CLASS (gst_mim_enc_parent_class)->change_state (element,
transition);
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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;
}
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GST_OBJECT_UNLOCK (mimenc);
if (paused_mode) {
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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");
}
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}
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break;
case GST_STATE_CHANGE_READY_TO_NULL:
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gst_mim_enc_reset (mimenc);
break;
default:
break;
}
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return ret;
}