gstreamer/ext/mpeg2enc/gstmpeg2enc.cc
Jan Schmidt 640aad2b46 mpeg2enc: Only allow 1 pending frame for encoding
Having an unlimited input queue is very bad if the
encoder can't run at real-time. Eventually it will
consume all RAM. I don't really see any reason to
have more than 1 outstanding encoded frame, so
remove the queue and limit things to 1 pending frame.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2499>
2021-09-06 14:14:50 +00:00

818 lines
24 KiB
C++

/* GStreamer mpeg2enc (mjpegtools) wrapper
* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
* (c) 2006 Mark Nauwelaerts <manauw@skynet.be>
*
* gstmpeg2enc.cc: gstreamer mpeg2enc wrapping
*
* 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-mpeg2enc
* @see_also: mpeg2dec
*
* This element encodes raw video into an MPEG-1/2 elementary stream using the
* [mjpegtools](http://mjpeg.sourceforge.net/) library.
*
* Documentation on MPEG encoding in general can be found in the
* [MJPEG Howto](https://sourceforge.net/docman/display_doc.php?docid=3456&group_id=5776)
* and on the various available parameters in the documentation
* of the mpeg2enc tool in particular, which shares options with this element.
*
* ## Example pipeline
*
* |[
* gst-launch-1.0 videotestsrc num-buffers=1000 ! mpeg2enc ! filesink location=videotestsrc.m1v
* ]| This example pipeline will encode a test video source to a an MPEG1
* elementary stream (with Generic MPEG1 profile).
*
* Likely, the #GstMpeg2enc:format property
* is most important, as it selects the type of MPEG stream that is produced.
* In particular, default property values are dependent on the format,
* and can even be forcibly restrained to certain pre-sets (and thereby ignored).
* Note that the (S)VCD profiles also restrict the image size, so some scaling
* may be needed to accommodate this. The so-called generic profiles (as used
* in the example above) allow most parameters to be adjusted.
*
* |[
* gst-launch-1.0 videotestsrc num-buffers=1000 ! videoscale ! mpeg2enc format=1 norm=p ! filesink location=videotestsrc.m1v
* ]| This will produce an MPEG1 profile stream according to VCD2.0 specifications
* for PAL #GstMpeg2enc:norm (as the image height is dependent on video norm).
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/glib-compat-private.h>
#include "gstmpeg2enc.hh"
GST_DEBUG_CATEGORY (mpeg2enc_debug);
#define COMMON_VIDEO_CAPS \
"width = (int) [ 16, 4096 ], " \
"height = (int) [ 16, 4096 ], " \
"framerate = " \
" (fraction) { 24000/1001, 24/1, 25/1, 30000/1001, 30/1, 50/1, 60000/1001 }"
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw, format = (string) I420, " COMMON_VIDEO_CAPS)
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"systemstream = (boolean) false, "
"mpegversion = (int) { 1, 2 }, " COMMON_VIDEO_CAPS)
);
static void gst_mpeg2enc_finalize (GObject * object);
static void gst_mpeg2enc_reset (GstMpeg2enc * enc);
static gboolean gst_mpeg2enc_start (GstVideoEncoder * video_encoder);
static gboolean gst_mpeg2enc_stop (GstVideoEncoder * video_encoder);
static gboolean gst_mpeg2enc_set_format (GstVideoEncoder *
video_encoder, GstVideoCodecState * state);
static GstCaps * gst_mpeg2enc_getcaps (GstVideoEncoder *
video_encoder, GstCaps * filter);
static GstFlowReturn gst_mpeg2enc_handle_frame (GstVideoEncoder *
video_encoder, GstVideoCodecFrame * frame);
static gboolean gst_mpeg2enc_sink_event (GstVideoEncoder *
video_encoder, GstEvent * event);
static GstFlowReturn gst_mpeg2enc_finish (GstVideoEncoder * video_encoder);
static void gst_mpeg2enc_loop (GstVideoEncoder * video_encoder);
static void gst_mpeg2enc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_mpeg2enc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static gboolean gst_mpeg2enc_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active);
static gboolean mpeg2enc_element_init (GstPlugin * plugin);
#define gst_mpeg2enc_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstMpeg2enc, gst_mpeg2enc, GST_TYPE_VIDEO_ENCODER,
G_IMPLEMENT_INTERFACE (GST_TYPE_PRESET, NULL));
GST_ELEMENT_REGISTER_DEFINE_CUSTOM (mpeg2enc, mpeg2enc_element_init);
static void
gst_mpeg2enc_class_init (GstMpeg2encClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoEncoderClass *video_encoder_class = GST_VIDEO_ENCODER_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (mpeg2enc_debug, "mpeg2enc", 0, "MPEG1/2 encoder");
object_class->set_property = gst_mpeg2enc_set_property;
object_class->get_property = gst_mpeg2enc_get_property;
/* register properties */
GstMpeg2EncOptions::initProperties (object_class);
object_class->finalize = GST_DEBUG_FUNCPTR (gst_mpeg2enc_finalize);
#if 0
element_class->change_state = GST_DEBUG_FUNCPTR (gst_mpeg2enc_change_state);
#endif
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_set_static_metadata (element_class,
"mpeg2enc video encoder", "Codec/Encoder/Video",
"High-quality MPEG-1/2 video encoder",
"Andrew Stevens <andrew.stevens@nexgo.de>\n"
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
video_encoder_class->start = GST_DEBUG_FUNCPTR (gst_mpeg2enc_start);
video_encoder_class->stop = GST_DEBUG_FUNCPTR (gst_mpeg2enc_stop);
video_encoder_class->handle_frame = GST_DEBUG_FUNCPTR (gst_mpeg2enc_handle_frame);
video_encoder_class->set_format = GST_DEBUG_FUNCPTR (gst_mpeg2enc_set_format);
video_encoder_class->finish = GST_DEBUG_FUNCPTR (gst_mpeg2enc_finish);
//video_encoder_class->pre_push = GST_DEBUG_FUNCPTR (gst_mpeg2enc_pre_push);
video_encoder_class->sink_event = GST_DEBUG_FUNCPTR (gst_mpeg2enc_sink_event);
video_encoder_class->getcaps = GST_DEBUG_FUNCPTR (gst_mpeg2enc_getcaps);
}
static void
gst_mpeg2enc_finalize (GObject * object)
{
GstMpeg2enc *enc = GST_MPEG2ENC (object);
/* clean up */
gst_mpeg2enc_reset (enc);
delete enc->options;
g_mutex_clear (&enc->tlock);
g_cond_clear (&enc->cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_mpeg2enc_init (GstMpeg2enc * enc)
{
enc->options = new GstMpeg2EncOptions ();
enc->encoder = NULL;
g_mutex_init (&enc->tlock);
g_cond_init (&enc->cond);
enc->started = FALSE;
gst_pad_set_activatemode_function (GST_VIDEO_ENCODER_SRC_PAD (enc),
GST_DEBUG_FUNCPTR (gst_mpeg2enc_src_activate_mode));
gst_mpeg2enc_reset (enc);
}
static gboolean
gst_mpeg2enc_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean result = TRUE;
GstMpeg2enc *enc;
enc = GST_MPEG2ENC (parent);
if (mode != GST_PAD_MODE_PUSH)
return FALSE;
if (active) {
/* setcaps will start task once encoder is setup */
} else {
/* can only end the encoding loop by forcing eos */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->eos = TRUE;
enc->srcresult = GST_FLOW_FLUSHING;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
}
return result;
}
static void
gst_mpeg2enc_reset (GstMpeg2enc * enc)
{
enc->eos = FALSE;
enc->srcresult = GST_FLOW_OK;
/* in case of error'ed ending */
if (enc->pending_frame) {
gst_video_encoder_finish_frame (GST_VIDEO_ENCODER (enc), enc->pending_frame);
enc->pending_frame = NULL;
}
if (enc->encoder) {
delete enc->encoder;
enc->encoder = NULL;
}
}
static gboolean
gst_mpeg2enc_start (GstVideoEncoder * video_encoder)
{
GstMpeg2enc *enc = GST_MPEG2ENC (video_encoder);
GST_DEBUG_OBJECT (video_encoder, "start");
if (!enc->options) {
GST_ELEMENT_ERROR (enc, LIBRARY, INIT,
("Failed to get default encoder options"), (NULL));
return FALSE;
}
/* start task to create multiplexor and start muxing */
if (G_UNLIKELY (enc->srcresult != GST_FLOW_OK)) {
GST_ELEMENT_ERROR (enc, LIBRARY, INIT,
("Invalid encoder state"), (NULL));
return FALSE;
}
return TRUE;
}
static gboolean
gst_mpeg2enc_stop (GstVideoEncoder * video_encoder)
{
gboolean result = TRUE;
GstMpeg2enc *enc;
GST_DEBUG_OBJECT (video_encoder, "stop");
enc = GST_MPEG2ENC (video_encoder);
/* can only end the encoding loop by forcing eos */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->eos = TRUE;
enc->srcresult = GST_FLOW_FLUSHING;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
/* encoding loop should have ended now and can be joined */
if (enc->started) {
result = gst_pad_stop_task (video_encoder->srcpad);
enc->started = FALSE;
}
GST_MPEG2ENC_MUTEX_LOCK (enc);
gst_mpeg2enc_reset (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
return result;
}
/* some (!) coding to get caps depending on the video norm and chosen format */
static void
gst_mpeg2enc_add_fps (GstStructure * structure, gint fpss[])
{
GValue list = { 0, }, fps = {
0,};
guint n;
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&fps, GST_TYPE_FRACTION);
for (n = 0; fpss[n] != 0; n += 2) {
gst_value_set_fraction (&fps, fpss[n], fpss[n + 1]);
gst_value_list_append_value (&list, &fps);
}
gst_structure_set_value (structure, "framerate", &list);
g_value_unset (&list);
g_value_unset (&fps);
}
static inline gint *
gst_mpeg2enc_get_fps (GstMpeg2enc * enc)
{
static gint fps_pal[]
= { 24, 1, 25, 1, 50, 1, 0 };
static gint fps_ntsc[]
= { 24000, 1001, 24, 1, 30000, 1001, 30, 1, 60000, 1001, 0 };
static gint fps_all[]
= { 24000, 1001, 24, 1, 30000, 1001, 30, 1, 60000, 1001, 25, 1, 50, 1, 0 };
if (enc->options->norm == 'n')
return fps_ntsc;
else if (enc->options->norm == 0)
return fps_all;
else
return fps_pal;
}
static gboolean
gst_mpeg2enc_set_format (GstVideoEncoder * video_encoder, GstVideoCodecState * state)
{
GstVideoCodecState *output_state;
GstMpeg2enc *enc;
GstCaps *caps;
enc = GST_MPEG2ENC (video_encoder);
GST_DEBUG_OBJECT (video_encoder, "set_format");
/* Store input state */
if (enc->input_state)
gst_video_codec_state_unref (enc->input_state);
enc->input_state = gst_video_codec_state_ref (state);
/* does not go well to restart stream mid-way */
if (enc->encoder != NULL)
goto refuse_renegotiation;
/* since mpeg encoder does not really check, let's check caps */
if (GST_VIDEO_INFO_FORMAT (&state->info) != GST_VIDEO_FORMAT_I420)
goto refuse_caps;
caps = gst_caps_new_simple ("video/mpeg",
"systemstream", G_TYPE_BOOLEAN, FALSE,
"mpegversion", G_TYPE_INT, (enc->options->mpeg == 1)?1:2, NULL);
output_state =
gst_video_encoder_set_output_state (video_encoder,
caps, state);
gst_video_codec_state_unref (output_state);
gst_video_encoder_negotiate (GST_VIDEO_ENCODER (enc));
return TRUE;
refuse_caps:
{
GST_WARNING_OBJECT (enc, "refused caps %" GST_PTR_FORMAT, state->caps);
return FALSE;
}
refuse_renegotiation:
{
GST_WARNING_OBJECT (enc, "refused renegotiation (to %" GST_PTR_FORMAT ")",
state->caps);
return FALSE;
}
}
static GstStructure *
gst_mpeg2enc_structure_from_norm (GstMpeg2enc * enc, gint horiz,
gint pal_v, gint ntsc_v)
{
GstStructure *structure;
structure = gst_structure_new ("video/x-raw",
"format", G_TYPE_STRING, "I420", NULL);
switch (enc->options->norm) {
case 0:
{
GValue list = { 0, }
, val = {
0,};
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&val, G_TYPE_INT);
g_value_set_int (&val, pal_v);
gst_value_list_append_value (&list, &val);
g_value_set_int (&val, ntsc_v);
gst_value_list_append_value (&list, &val);
gst_structure_set_value (structure, "height", &list);
g_value_unset (&list);
g_value_unset (&val);
break;
}
case 'n':
gst_structure_set (structure, "height", G_TYPE_INT, ntsc_v,
(void *) NULL);
break;
default:
gst_structure_set (structure, "height", G_TYPE_INT, pal_v, (void *) NULL);
break;
}
gst_structure_set (structure, "width", G_TYPE_INT, horiz, (void *) NULL);
gst_mpeg2enc_add_fps (structure, gst_mpeg2enc_get_fps (enc));
return structure;
}
static GstCaps *
gst_mpeg2enc_getcaps (GstVideoEncoder * video_encoder, GstCaps * filter)
{
GstCaps *caps;
GstMpeg2enc *enc = GST_MPEG2ENC (video_encoder);
caps = gst_pad_get_current_caps (video_encoder->sinkpad);
if (caps)
return caps;
switch (enc->options->format) {
case 1: /* vcd */
case 2: /* user vcd */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
352, 288, 240), NULL);
break;
case 4: /* svcd */
case 5: /* user svcd */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
480, 576, 480), NULL);
break;
case 6: /* vcd stills */
/* low resolution */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
352, 288, 240), NULL);
/* high resolution */
gst_caps_append_structure (caps,
gst_mpeg2enc_structure_from_norm (enc, 704, 576, 480));
break;
case 7: /* svcd stills */
/* low resolution */
caps = gst_caps_new_full (gst_mpeg2enc_structure_from_norm (enc,
480, 576, 480), NULL);
/* high resolution */
gst_caps_append_structure (caps,
gst_mpeg2enc_structure_from_norm (enc, 704, 576, 480));
break;
case 0:
case 3:
case 8:
case 9:
default:
caps = gst_caps_copy (gst_pad_get_pad_template_caps (video_encoder->sinkpad));
gst_mpeg2enc_add_fps (gst_caps_get_structure (caps, 0),
gst_mpeg2enc_get_fps (enc));
break;
}
return caps;
}
static GstFlowReturn
gst_mpeg2enc_finish (GstVideoEncoder * video_encoder)
{
GstMpeg2enc *enc;
enc = GST_MPEG2ENC (video_encoder);
GST_DEBUG_OBJECT (video_encoder, "finish");
/* inform the encoding task that it can stop now */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->eos = TRUE;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
return GST_FLOW_OK;
}
static gboolean
gst_mpeg2enc_sink_event (GstVideoEncoder * video_encoder, GstEvent * event)
{
GstMpeg2enc *enc;
gboolean result = TRUE;
enc = GST_MPEG2ENC (video_encoder);
GST_DEBUG_OBJECT (video_encoder, "sink_event");
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* forward event */
result = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (video_encoder, event);
/* no special action as there is not much to flush;
* neither is it possible to halt the mpeg encoding loop */
goto done;
case GST_EVENT_FLUSH_STOP:
/* forward event */
result = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (video_encoder, event);
if (!result)
goto done;
/* this clears the error state in case of a failure in encoding task;
* so handle_frame function can carry on again */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->srcresult = GST_FLOW_OK;
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
goto done;
case GST_EVENT_EOS:
/* inform the encoding task that it can stop now */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->eos = TRUE;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
/* eat this event for now, task will send eos when finished */
gst_event_unref (event);
goto done;
default:
/* for a serialized event, wait until an earlier buffer is gone,
* though this is no guarantee as to when the encoder is done with it */
if (GST_EVENT_IS_SERIALIZED (event)) {
GST_MPEG2ENC_MUTEX_LOCK (enc);
while (enc->pending_frame != NULL)
GST_MPEG2ENC_WAIT (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
}
break;
}
result = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (video_encoder, event);
done:
return result;
}
static void
gst_mpeg2enc_loop (GstVideoEncoder * video_encoder)
{
GstMpeg2enc *enc = GST_MPEG2ENC (video_encoder);
GST_DEBUG_OBJECT (enc, "encoding task loop:START");
/* do not try to resume or start when output problems;
* also ensures a proper (forced) state change */
if (enc->srcresult != GST_FLOW_OK) {
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->srcresult = GST_FLOW_ERROR;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
goto ignore;
}
GST_DEBUG_OBJECT (enc, "encoding task loop: flow OK");
if (!enc->encoder) {
gboolean ret;
GstClockTime latency;
GstVideoInfo *info = &enc->input_state->info;
/* create new encoder with these settings */
enc->encoder = new GstMpeg2Encoder (enc->options, GST_ELEMENT (video_encoder),
gst_pad_get_current_caps(video_encoder->sinkpad));
ret = enc->encoder->setup ();
/* We must have a fixated max GOP size after setting up */
g_assert (enc->options->max_GOP_size != -1);
/* mjpeg tools outputs encoded data on a GOP basis, our latency is
* thus at least max_GOP_size. It also introduces a 5-frame delay on
* top of that, this was determined empirically, a surface level inspection
* of the code didn't show where and why that delay is introduced exactly,
* and this is not specifically documented, but it needs to be taken
* into account when calculating the latency
*/
if (GST_VIDEO_INFO_FPS_D (info) == 0 || GST_VIDEO_INFO_FPS_N (info) == 0) {
/* Assume 25fps for unknown framerates. Better than reporting
* that we introduce no latency while we actually do
*/
latency = gst_util_uint64_scale (enc->options->max_GOP_size + 5,
1 * GST_SECOND, 25);
} else {
latency = gst_util_uint64_scale (enc->options->max_GOP_size + 5,
GST_VIDEO_INFO_FPS_D (info) * GST_SECOND, GST_VIDEO_INFO_FPS_N (info));
}
gst_video_encoder_set_latency (video_encoder, latency, latency);
/* SeqEncoder init requires at least two frames */
enc->encoder->init ();
if (!ret) {
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->srcresult = GST_FLOW_NOT_NEGOTIATED;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
goto encoder;
}
}
GST_DEBUG_OBJECT (enc, "encoding task loop: setup and init DONE");
/* note that init performs a pre-fill and therefore needs buffers */
/* task will stay in here during all of the encoding */
enc->encoder->encode ();
GST_DEBUG_OBJECT (enc, "encoding task loop: encode DONE");
/* if not well and truly eos, something strange happened */
if (!enc->eos) {
GST_ERROR_OBJECT (enc, "encoding task ended without being eos");
/* notify the handle_frame function that it's over */
GST_MPEG2ENC_MUTEX_LOCK (enc);
enc->srcresult = GST_FLOW_ERROR;
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
} else {
/* send eos if this was not a forced stop or other problem */
GST_DEBUG_OBJECT (enc, "encoding task loop: eos REACHED");
if (enc->srcresult == GST_FLOW_OK) {
gst_pad_push_event (video_encoder->srcpad, gst_event_new_eos ());
GST_DEBUG_OBJECT (enc, "encoding task loop: eos SENT");
}
goto eos;
}
/* fall-through */
done:
{
/* no need to run wildly, stopped elsewhere, e.g. state change */
GST_DEBUG_OBJECT (enc, "pausing encoding task");
gst_pad_pause_task (video_encoder->srcpad);
return;
}
encoder:
{
GST_ELEMENT_ERROR (enc, CORE, NEGOTIATION, (NULL),
("encoder setup failed"));
if (enc->encoder) {
delete enc->encoder;
enc->encoder = NULL;
}
goto done;
}
eos:
{
GST_DEBUG_OBJECT (enc, "encoding task reached eos");
goto done;
}
ignore:
{
GST_DEBUG_OBJECT (enc, "not looping because encoding task encountered %s",
gst_flow_get_name (enc->srcresult));
goto done;
}
}
static GstFlowReturn
gst_mpeg2enc_handle_frame (GstVideoEncoder *video_encoder, GstVideoCodecFrame *frame)
{
GstMpeg2enc *enc = GST_MPEG2ENC (video_encoder);
GST_DEBUG_OBJECT (video_encoder, "handle_frame");
GST_MPEG2ENC_MUTEX_LOCK (enc);
if (G_UNLIKELY (enc->eos))
goto eos;
GST_DEBUG_OBJECT (video_encoder, "handle_frame: NOT eos");
if (G_UNLIKELY (enc->srcresult != GST_FLOW_OK))
goto ignore;
GST_DEBUG_OBJECT (video_encoder, "handle_frame: flow OK");
/* If the encoder is busy with a previous frame still, wait
* for it to be done */
if (enc->pending_frame != NULL) {
do {
GST_VIDEO_ENCODER_STREAM_UNLOCK (enc);
GST_MPEG2ENC_WAIT (enc);
GST_VIDEO_ENCODER_STREAM_LOCK (enc);
/* Re-check the srcresult, since we waited */
if (G_UNLIKELY (enc->srcresult != GST_FLOW_OK))
goto ignore;
} while (enc->pending_frame != NULL);
}
/* frame will be released by task */
enc->pending_frame = frame;
if (!enc->started) {
GST_DEBUG_OBJECT (video_encoder, "handle_frame: START task");
gst_pad_start_task (video_encoder->srcpad, (GstTaskFunction) gst_mpeg2enc_loop, enc, NULL);
enc->started = TRUE;
}
/* things look good, now inform the encoding task that a frame is ready */
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
return GST_FLOW_OK;
eos:
{
GST_DEBUG_OBJECT (enc, "ignoring frame at end-of-stream");
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
gst_video_encoder_finish_frame (video_encoder, frame);
return GST_FLOW_EOS;
}
ignore:
{
GstFlowReturn ret = enc->srcresult;
GST_DEBUG_OBJECT (enc,
"ignoring frame because encoding task encountered %s",
gst_flow_get_name (enc->srcresult));
enc->eos = TRUE;
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
gst_video_encoder_finish_frame (video_encoder, frame);
return ret;
}
}
static void
gst_mpeg2enc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GST_MPEG2ENC (object)->options->getProperty (prop_id, value);
}
static void
gst_mpeg2enc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GST_MPEG2ENC (object)->options->setProperty (prop_id, value);
}
#ifndef GST_DISABLE_GST_DEBUG
static mjpeg_log_handler_t old_handler = NULL;
/* note that this will affect all mjpegtools elements/threads */
static void
gst_mpeg2enc_log_callback (log_level_t level, const char *message)
{
GstDebugLevel gst_level;
#if GST_MJPEGTOOLS_API >= 10903
static const gint mjpeg_log_error = mjpeg_loglev_t ("error");
static const gint mjpeg_log_warn = mjpeg_loglev_t ("warn");
static const gint mjpeg_log_info = mjpeg_loglev_t ("info");
static const gint mjpeg_log_debug = mjpeg_loglev_t ("debug");
#else
static const gint mjpeg_log_error = LOG_ERROR;
static const gint mjpeg_log_warn = LOG_WARN;
static const gint mjpeg_log_info = LOG_INFO;
static const gint mjpeg_log_debug = LOG_DEBUG;
#endif
if (level == mjpeg_log_error) {
gst_level = GST_LEVEL_ERROR;
} else if (level == mjpeg_log_warn) {
gst_level = GST_LEVEL_WARNING;
} else if (level == mjpeg_log_info) {
gst_level = GST_LEVEL_INFO;
} else if (level == mjpeg_log_debug) {
gst_level = GST_LEVEL_DEBUG;
} else {
gst_level = GST_LEVEL_INFO;
}
/* message could have a % in it, do not segfault in such case */
gst_debug_log (mpeg2enc_debug, gst_level, "", "", 0, NULL, "%s", message);
/* chain up to the old handler;
* this could actually be a handler from another mjpegtools based
* plugin; in which case messages can come out double or from
* the wrong plugin (element)... */
old_handler (level, message);
}
#endif
static gboolean
mpeg2enc_element_init (GstPlugin * plugin)
{
#ifndef GST_DISABLE_GST_DEBUG
old_handler = mjpeg_log_set_handler (gst_mpeg2enc_log_callback);
g_assert (old_handler != NULL);
#endif
/* in any case, we do not want default handler output */
mjpeg_default_handler_verbosity (0);
return gst_element_register (plugin, "mpeg2enc",
GST_RANK_MARGINAL, GST_TYPE_MPEG2ENC);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return GST_ELEMENT_REGISTER (mpeg2enc, plugin);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
mpeg2enc,
"High-quality MPEG-1/2 video encoder",
plugin_init, VERSION, "GPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)