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gstreamer/subprojects/gst-plugins-good/sys/v4l2/gstv4l2videoenc.c

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/*
* Copyright (C) 2014-2017 SUMOMO Computer Association
* Authors Ayaka <ayaka@soulik.info>
* Copyright (C) 2017 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* 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 <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include "gstv4l2object.h"
#include "gstv4l2videoenc.h"
#include <string.h>
#include <gst/gst-i18n-plugin.h>
GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_enc_debug);
#define GST_CAT_DEFAULT gst_v4l2_video_enc_debug
typedef struct
{
gchar *device;
GstCaps *sink_caps;
GstCaps *src_caps;
const GstV4l2Codec *codec;
} GstV4l2VideoEncCData;
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS,
};
#define gst_v4l2_video_enc_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoEnc, gst_v4l2_video_enc,
GST_TYPE_VIDEO_ENCODER);
static void
gst_v4l2_video_enc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
switch (prop_id) {
case PROP_CAPTURE_IO_MODE:
if (!gst_v4l2_object_set_property_helper (self->v4l2capture,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
/* By default, only set on output */
default:
if (!gst_v4l2_object_set_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static void
gst_v4l2_video_enc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
switch (prop_id) {
case PROP_CAPTURE_IO_MODE:
if (!gst_v4l2_object_get_property_helper (self->v4l2capture,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
/* By default read from output */
default:
if (!gst_v4l2_object_get_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static gboolean
gst_v4l2_video_enc_open (GstVideoEncoder * encoder)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GstCaps *codec_caps;
GST_DEBUG_OBJECT (self, "Opening");
if (!gst_v4l2_object_open (self->v4l2output, &error))
goto failure;
if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
goto failure;
self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output,
gst_v4l2_object_get_raw_caps ());
if (gst_caps_is_empty (self->probed_sinkcaps))
goto no_raw_format;
codec_caps = gst_pad_get_pad_template_caps (encoder->srcpad);
self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture,
codec_caps);
gst_caps_unref (codec_caps);
if (gst_caps_is_empty (self->probed_srccaps))
goto no_encoded_format;
return TRUE;
no_encoded_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Encoder on device %s has no supported output format"),
self->v4l2output->videodev), (NULL));
goto failure;
no_raw_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Encoder on device %s has no supported input format"),
self->v4l2output->videodev), (NULL));
goto failure;
failure:
if (GST_V4L2_IS_OPEN (self->v4l2output))
gst_v4l2_object_close (self->v4l2output);
if (GST_V4L2_IS_OPEN (self->v4l2capture))
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
gst_v4l2_error (self, &error);
return FALSE;
}
static gboolean
gst_v4l2_video_enc_close (GstVideoEncoder * encoder)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GST_DEBUG_OBJECT (self, "Closing");
gst_v4l2_object_close (self->v4l2output);
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
return TRUE;
}
static gboolean
gst_v4l2_video_enc_start (GstVideoEncoder * encoder)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GST_DEBUG_OBJECT (self, "Starting");
gst_v4l2_object_unlock (self->v4l2output);
g_atomic_int_set (&self->active, TRUE);
self->output_flow = GST_FLOW_OK;
return TRUE;
}
static gboolean
gst_v4l2_video_enc_stop (GstVideoEncoder * encoder)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GST_DEBUG_OBJECT (self, "Stopping");
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
/* Wait for capture thread to stop */
gst_pad_stop_task (encoder->srcpad);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
self->output_flow = GST_FLOW_OK;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
/* Should have been flushed already */
g_assert (g_atomic_int_get (&self->active) == FALSE);
g_assert (g_atomic_int_get (&self->processing) == FALSE);
gst_v4l2_object_stop (self->v4l2output);
gst_v4l2_object_stop (self->v4l2capture);
if (self->input_state) {
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
}
GST_DEBUG_OBJECT (self, "Stopped");
return TRUE;
}
static gboolean
gst_v4l2_encoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
{
struct v4l2_encoder_cmd ecmd = { 0, };
GST_DEBUG_OBJECT (v4l2object->element,
"sending v4l2 encoder command %u with flags %u", cmd, flags);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
ecmd.cmd = cmd;
ecmd.flags = flags;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENCODER_CMD, &ecmd) < 0)
goto ecmd_failed;
return TRUE;
ecmd_failed:
if (errno == ENOTTY) {
GST_INFO_OBJECT (v4l2object->element,
"Failed to send encoder command %u with flags %u for '%s'. (%s)",
cmd, flags, v4l2object->videodev, g_strerror (errno));
} else {
GST_ERROR_OBJECT (v4l2object->element,
"Failed to send encoder command %u with flags %u for '%s'. (%s)",
cmd, flags, v4l2object->videodev, g_strerror (errno));
}
return FALSE;
}
static GstFlowReturn
gst_v4l2_video_enc_finish (GstVideoEncoder * encoder)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GstFlowReturn ret = GST_FLOW_OK;
if (gst_pad_get_task_state (encoder->srcpad) != GST_TASK_STARTED)
goto done;
GST_DEBUG_OBJECT (self, "Finishing encoding");
/* drop the stream lock while draining, so remaining buffers can be
* pushed from the src pad task thread */
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
if (gst_v4l2_encoder_cmd (self->v4l2capture, V4L2_ENC_CMD_STOP, 0)) {
GstTask *task = encoder->srcpad->task;
/* Wait for the task to be drained */
GST_DEBUG_OBJECT (self, "Waiting for encoder stop");
GST_OBJECT_LOCK (task);
while (GST_TASK_STATE (task) == GST_TASK_STARTED)
GST_TASK_WAIT (task);
GST_OBJECT_UNLOCK (task);
ret = GST_FLOW_FLUSHING;
}
/* and ensure the processing thread has stopped in case another error
* occurred. */
gst_v4l2_object_unlock (self->v4l2capture);
gst_pad_stop_task (encoder->srcpad);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (ret == GST_FLOW_FLUSHING)
ret = self->output_flow;
GST_DEBUG_OBJECT (encoder, "Done draining buffers");
done:
return ret;
}
static gboolean
gst_v4l2_video_enc_set_format (GstVideoEncoder * encoder,
GstVideoCodecState * state)
{
gboolean ret = TRUE;
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GstCaps *outcaps;
GstVideoCodecState *output;
GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
if (self->input_state) {
if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
GST_DEBUG_OBJECT (self, "Compatible caps");
return TRUE;
}
if (gst_v4l2_video_enc_finish (encoder) != GST_FLOW_OK)
return FALSE;
gst_v4l2_object_stop (self->v4l2output);
gst_v4l2_object_stop (self->v4l2capture);
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
}
outcaps = gst_pad_get_pad_template_caps (encoder->srcpad);
outcaps = gst_caps_make_writable (outcaps);
output = gst_video_encoder_set_output_state (encoder, outcaps, state);
gst_video_codec_state_unref (output);
if (!gst_video_encoder_negotiate (encoder))
return FALSE;
if (!gst_v4l2_object_set_format (self->v4l2output, state->caps, &error)) {
gst_v4l2_error (self, &error);
return FALSE;
}
self->input_state = gst_video_codec_state_ref (state);
GST_DEBUG_OBJECT (self, "output caps: %" GST_PTR_FORMAT, state->caps);
return ret;
}
static gboolean
gst_v4l2_video_enc_flush (GstVideoEncoder * encoder)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GST_DEBUG_OBJECT (self, "Flushing");
/* Ensure the processing thread has stopped for the reverse playback
* iscount case */
if (g_atomic_int_get (&self->processing)) {
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
gst_v4l2_object_unlock_stop (self->v4l2output);
gst_v4l2_object_unlock_stop (self->v4l2capture);
gst_pad_stop_task (encoder->srcpad);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
}
self->output_flow = GST_FLOW_OK;
gst_v4l2_object_unlock_stop (self->v4l2output);
gst_v4l2_object_unlock_stop (self->v4l2capture);
return TRUE;
}
struct ProfileLevelCtx
{
GstV4l2VideoEnc *self;
const gchar *profile;
const gchar *level;
};
static gboolean
get_string_list (GstStructure * s, const gchar * field, GQueue * queue)
{
const GValue *value;
value = gst_structure_get_value (s, field);
if (!value)
return FALSE;
if (GST_VALUE_HOLDS_LIST (value)) {
guint i;
if (gst_value_list_get_size (value) == 0)
return FALSE;
for (i = 0; i < gst_value_list_get_size (value); i++) {
const GValue *item = gst_value_list_get_value (value, i);
if (G_VALUE_HOLDS_STRING (item))
g_queue_push_tail (queue, g_value_dup_string (item));
}
} else if (G_VALUE_HOLDS_STRING (value)) {
g_queue_push_tail (queue, g_value_dup_string (value));
}
return TRUE;
}
static gboolean
negotiate_profile_and_level (GstCapsFeatures * features, GstStructure * s,
gpointer user_data)
{
struct ProfileLevelCtx *ctx = user_data;
GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (ctx->self);
GstV4l2Object *v4l2object = GST_V4L2_VIDEO_ENC (ctx->self)->v4l2output;
GQueue profiles = G_QUEUE_INIT;
GQueue levels = G_QUEUE_INIT;
gboolean failed = FALSE;
const GstV4l2Codec *codec = klass->codec;
if (codec->profile_cid && get_string_list (s, "profile", &profiles)) {
GList *l;
for (l = profiles.head; l; l = l->next) {
struct v4l2_control control = { 0, };
gint v4l2_profile;
const gchar *profile = l->data;
GST_TRACE_OBJECT (ctx->self, "Trying profile %s", profile);
control.id = codec->profile_cid;
control.value = v4l2_profile = codec->profile_from_string (profile);
if (control.value < 0)
continue;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
GST_WARNING_OBJECT (ctx->self, "Failed to set %s profile: '%s'",
klass->codec_name, g_strerror (errno));
break;
}
profile = codec->profile_to_string (control.value);
if (control.value == v4l2_profile) {
ctx->profile = profile;
break;
}
if (g_list_find_custom (l, profile, g_str_equal)) {
ctx->profile = profile;
break;
}
}
if (profiles.length && !ctx->profile)
failed = TRUE;
g_queue_foreach (&profiles, (GFunc) g_free, NULL);
g_queue_clear (&profiles);
}
if (!failed && codec->level_cid && get_string_list (s, "level", &levels)) {
GList *l;
for (l = levels.head; l; l = l->next) {
struct v4l2_control control = { 0, };
gint v4l2_level;
const gchar *level = l->data;
GST_TRACE_OBJECT (ctx->self, "Trying level %s", level);
control.id = codec->level_cid;
control.value = v4l2_level = codec->level_from_string (level);
if (control.value < 0)
continue;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
GST_WARNING_OBJECT (ctx->self, "Failed to set %s level: '%s'",
klass->codec_name, g_strerror (errno));
break;
}
level = codec->level_to_string (control.value);
if (control.value == v4l2_level) {
ctx->level = level;
break;
}
if (g_list_find_custom (l, level, g_str_equal)) {
ctx->level = level;
break;
}
}
if (levels.length && !ctx->level)
failed = TRUE;
g_queue_foreach (&levels, (GFunc) g_free, NULL);
g_queue_clear (&levels);
}
/* If it failed, we continue */
return failed;
}
static gboolean
gst_v4l2_video_enc_negotiate (GstVideoEncoder * encoder)
{
GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (encoder);
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GstV4l2Object *v4l2object = self->v4l2output;
GstCaps *allowed_caps;
struct ProfileLevelCtx ctx = { self, NULL, NULL };
GstVideoCodecState *state;
GstStructure *s;
const GstV4l2Codec *codec = klass->codec;
GST_DEBUG_OBJECT (self, "Negotiating %s profile and level.",
klass->codec_name);
/* Only renegotiate on upstream changes */
if (self->input_state)
return TRUE;
if (!codec)
goto done;
allowed_caps = gst_pad_get_allowed_caps (GST_VIDEO_ENCODER_SRC_PAD (encoder));
if (allowed_caps) {
if (gst_caps_is_empty (allowed_caps))
goto not_negotiated;
allowed_caps = gst_caps_make_writable (allowed_caps);
/* negotiate_profile_and_level() will return TRUE on failure to keep
* iterating, if gst_caps_foreach() returns TRUE it means there was no
* compatible profile and level in any of the structure */
if (gst_caps_foreach (allowed_caps, negotiate_profile_and_level, &ctx)) {
goto no_profile_level;
}
gst_caps_unref (allowed_caps);
allowed_caps = NULL;
}
if (codec->profile_cid && !ctx.profile) {
struct v4l2_control control = { 0, };
control.id = codec->profile_cid;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
goto g_ctrl_failed;
ctx.profile = codec->profile_to_string (control.value);
}
if (codec->level_cid && !ctx.level) {
struct v4l2_control control = { 0, };
control.id = codec->level_cid;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
goto g_ctrl_failed;
ctx.level = codec->level_to_string (control.value);
}
GST_DEBUG_OBJECT (self, "Selected %s profile %s at level %s",
klass->codec_name, ctx.profile, ctx.level);
state = gst_video_encoder_get_output_state (encoder);
s = gst_caps_get_structure (state->caps, 0);
if (codec->profile_cid)
gst_structure_set (s, "profile", G_TYPE_STRING, ctx.profile, NULL);
if (codec->level_cid)
gst_structure_set (s, "level", G_TYPE_STRING, ctx.level, NULL);
done:
if (!GST_VIDEO_ENCODER_CLASS (parent_class)->negotiate (encoder))
return FALSE;
return TRUE;
g_ctrl_failed:
GST_WARNING_OBJECT (self, "Failed to get %s profile and level: '%s'",
klass->codec_name, g_strerror (errno));
goto not_negotiated;
no_profile_level:
GST_WARNING_OBJECT (self, "No compatible level and profile in caps: %"
GST_PTR_FORMAT, allowed_caps);
goto not_negotiated;
not_negotiated:
if (allowed_caps)
gst_caps_unref (allowed_caps);
return FALSE;
}
static gboolean
check_system_frame_number_too_old (guint32 current, guint32 old)
{
guint32 absdiff = current > old ? current - old : old - current;
/* More than 100 frames in the past, or current wrapped around */
if (absdiff > 100) {
/* Wraparound and difference is actually smaller than 100 */
if (absdiff > G_MAXUINT32 - 100)
return FALSE;
return TRUE;
}
return FALSE;
}
static void
gst_v4l2_video_enc_loop (GstVideoEncoder * encoder)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GstVideoCodecFrame *frame;
GstBuffer *buffer = NULL;
GstFlowReturn ret;
GST_LOG_OBJECT (encoder, "Allocate output buffer");
buffer = gst_video_encoder_allocate_output_buffer (encoder,
self->v4l2capture->info.size);
if (NULL == buffer) {
ret = GST_FLOW_FLUSHING;
goto beach;
}
/* FIXME Check if buffer isn't the last one here */
GST_LOG_OBJECT (encoder, "Process output buffer");
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
(self->v4l2capture->pool), &buffer, NULL);
if (ret != GST_FLOW_OK)
goto beach;
if (GST_BUFFER_TIMESTAMP (buffer) % GST_SECOND != 0)
GST_ERROR_OBJECT (encoder,
"Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git");
GST_LOG_OBJECT (encoder, "Got buffer for frame number %u",
(guint32) (GST_BUFFER_PTS (buffer) / GST_SECOND));
frame =
gst_video_encoder_get_frame (encoder,
GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND);
if (frame) {
GstVideoCodecFrame *oldest_frame;
gboolean warned = FALSE;
/* Garbage collect old frames in case of codec bugs */
while ((oldest_frame = gst_video_encoder_get_oldest_frame (encoder)) &&
check_system_frame_number_too_old (frame->system_frame_number,
oldest_frame->system_frame_number)) {
gst_video_encoder_finish_frame (encoder, oldest_frame);
oldest_frame = NULL;
if (!warned) {
g_warning ("%s: Too old frames, bug in encoder -- please file a bug",
GST_ELEMENT_NAME (encoder));
warned = TRUE;
}
}
if (oldest_frame)
gst_video_codec_frame_unref (oldest_frame);
/* At this point, the delta unit buffer flag is already correctly set by
* gst_v4l2_buffer_pool_process. Since gst_video_encoder_finish_frame
* will overwrite it from GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame),
* set that here.
*/
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
GST_VIDEO_CODEC_FRAME_UNSET_SYNC_POINT (frame);
else
GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (frame);
frame->output_buffer = buffer;
buffer = NULL;
ret = gst_video_encoder_finish_frame (encoder, frame);
if (ret != GST_FLOW_OK)
goto beach;
} else {
GST_WARNING_OBJECT (encoder, "Encoder is producing too many buffers");
gst_buffer_unref (buffer);
}
return;
beach:
GST_DEBUG_OBJECT (encoder, "Leaving output thread");
gst_buffer_replace (&buffer, NULL);
self->output_flow = ret;
g_atomic_int_set (&self->processing, FALSE);
gst_v4l2_object_unlock (self->v4l2output);
gst_pad_pause_task (encoder->srcpad);
}
static void
gst_v4l2_video_enc_loop_stopped (GstV4l2VideoEnc * self)
{
if (g_atomic_int_get (&self->processing)) {
GST_DEBUG_OBJECT (self, "Early stop of encoding thread");
self->output_flow = GST_FLOW_FLUSHING;
g_atomic_int_set (&self->processing, FALSE);
}
GST_DEBUG_OBJECT (self, "Encoding task destroyed: %s",
gst_flow_get_name (self->output_flow));
}
static GstFlowReturn
gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder,
GstVideoCodecFrame * frame)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GstFlowReturn ret = GST_FLOW_OK;
GstTaskState task_state;
GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
goto flushing;
task_state = gst_pad_get_task_state (GST_VIDEO_ENCODER_SRC_PAD (self));
if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
/* It is possible that the processing thread stopped due to an error or
* when the last buffer has been met during the draining process. */
if (self->output_flow != GST_FLOW_OK &&
self->output_flow != GST_FLOW_FLUSHING &&
self->output_flow != GST_V4L2_FLOW_LAST_BUFFER) {
GST_DEBUG_OBJECT (self, "Processing loop stopped with error: %s, leaving",
gst_flow_get_name (self->output_flow));
ret = self->output_flow;
goto drop;
}
/* Ensure input internal pool is active */
if (!gst_buffer_pool_is_active (pool)) {
GstStructure *config = gst_buffer_pool_get_config (pool);
guint min = MAX (self->v4l2output->min_buffers,
GST_V4L2_MIN_BUFFERS (self->v4l2output));
gst_buffer_pool_config_set_params (config, self->input_state->caps,
self->v4l2output->info.size, min, min);
/* There is no reason to refuse this config */
if (!gst_buffer_pool_set_config (pool, config))
goto activate_failed;
if (!gst_buffer_pool_set_active (pool, TRUE))
goto activate_failed;
}
if (!gst_buffer_pool_set_active
(GST_BUFFER_POOL (self->v4l2capture->pool), TRUE)) {
GST_WARNING_OBJECT (self, "Could not activate capture buffer pool.");
goto activate_failed;
}
GST_DEBUG_OBJECT (self, "Starting encoding thread");
/* Start the processing task, when it quits, the task will disable input
* processing to unlock input if draining, or prevent potential block */
if (!gst_pad_start_task (encoder->srcpad,
(GstTaskFunction) gst_v4l2_video_enc_loop, self,
(GDestroyNotify) gst_v4l2_video_enc_loop_stopped))
goto start_task_failed;
}
if (frame->input_buffer) {
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
GST_LOG_OBJECT (encoder, "Passing buffer with frame number %u",
frame->system_frame_number);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), &frame->input_buffer,
&frame->system_frame_number);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (ret == GST_FLOW_FLUSHING) {
if (gst_pad_get_task_state (encoder->srcpad) != GST_TASK_STARTED)
ret = self->output_flow;
goto drop;
} else if (ret != GST_FLOW_OK) {
goto process_failed;
}
}
gst_video_codec_frame_unref (frame);
return ret;
/* ERRORS */
activate_failed:
{
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Failed to allocate required memory.")),
("Buffer pool activation failed"));
return GST_FLOW_ERROR;
}
flushing:
{
ret = GST_FLOW_FLUSHING;
goto drop;
}
start_task_failed:
{
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
(_("Failed to start encoding thread.")), (NULL));
g_atomic_int_set (&self->processing, FALSE);
ret = GST_FLOW_ERROR;
goto drop;
}
process_failed:
{
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
(_("Failed to process frame.")),
("Maybe be due to not enough memory or failing driver"));
ret = GST_FLOW_ERROR;
goto drop;
}
drop:
{
gst_video_encoder_finish_frame (encoder, frame);
return ret;
}
}
static gboolean
gst_v4l2_video_enc_decide_allocation (GstVideoEncoder *
encoder, GstQuery * query)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
GstVideoCodecState *state = gst_video_encoder_get_output_state (encoder);
GstCaps *caps;
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GstClockTime latency;
gboolean ret = FALSE;
/* We need to set the format here, since this is called right after
* GstVideoEncoder have set the width, height and framerate into the state
* caps. These are needed by the driver to calculate the buffer size and to
* implement bitrate adaptation. */
caps = gst_caps_copy (state->caps);
gst_structure_remove_field (gst_caps_get_structure (caps, 0), "colorimetry");
if (!gst_v4l2_object_set_format (self->v4l2capture, caps, &error)) {
gst_v4l2_error (self, &error);
gst_caps_unref (caps);
ret = FALSE;
goto done;
}
gst_caps_unref (caps);
if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) {
GstVideoEncoderClass *enc_class = GST_VIDEO_ENCODER_CLASS (parent_class);
ret = enc_class->decide_allocation (encoder, query);
}
/* FIXME This may not be entirely correct, as encoder may keep some
* observation without delaying the encoding. Linux Media API need some
* more work to explicitly expressed the decoder / encoder latency. This
* value will then become max latency, and the reported driver latency would
* become the min latency. */
if (!GST_CLOCK_TIME_IS_VALID (self->v4l2capture->duration))
self->v4l2capture->duration = gst_util_uint64_scale_int (GST_SECOND, 1, 25);
latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
gst_video_encoder_set_latency (encoder, latency, latency);
GST_DEBUG_OBJECT (self, "Setting latency: %" GST_TIME_FORMAT,
GST_TIME_ARGS (latency));
done:
gst_video_codec_state_unref (state);
return ret;
}
static gboolean
gst_v4l2_video_enc_propose_allocation (GstVideoEncoder *
encoder, GstQuery * query)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
gboolean ret = FALSE;
GST_DEBUG_OBJECT (self, "called");
if (query == NULL)
ret = TRUE;
else
ret = gst_v4l2_object_propose_allocation (self->v4l2output, query);
if (ret)
ret = GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
query);
return ret;
}
static gboolean
gst_v4l2_video_enc_src_query (GstVideoEncoder * encoder, GstQuery * query)
{
gboolean ret = TRUE;
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:{
GstCaps *filter, *result = NULL;
GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (encoder);
gst_query_parse_caps (query, &filter);
/* FIXME Try and not probe the entire encoder, but only the implement
* subclass format */
if (self->probed_srccaps) {
GstCaps *tmpl = gst_pad_get_pad_template_caps (pad);
result = gst_caps_intersect (tmpl, self->probed_srccaps);
gst_caps_unref (tmpl);
} else
result = gst_pad_get_pad_template_caps (pad);
if (filter) {
GstCaps *tmp = result;
result =
gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
gst_query_set_caps_result (query, result);
gst_caps_unref (result);
break;
}
default:
ret = GST_VIDEO_ENCODER_CLASS (parent_class)->src_query (encoder, query);
break;
}
return ret;
}
static gboolean
gst_v4l2_video_enc_sink_query (GstVideoEncoder * encoder, GstQuery * query)
{
gboolean ret = TRUE;
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:{
GstCaps *filter, *result = NULL;
GstPad *pad = GST_VIDEO_ENCODER_SINK_PAD (encoder);
gst_query_parse_caps (query, &filter);
if (self->probed_sinkcaps)
result = gst_caps_ref (self->probed_sinkcaps);
else
result = gst_pad_get_pad_template_caps (pad);
if (filter) {
GstCaps *tmp = result;
result =
gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
gst_query_set_caps_result (query, result);
gst_caps_unref (result);
break;
}
default:
ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_query (encoder, query);
break;
}
return ret;
}
static gboolean
gst_v4l2_video_enc_sink_event (GstVideoEncoder * encoder, GstEvent * event)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
gboolean ret;
GstEventType type = GST_EVENT_TYPE (event);
switch (type) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (self, "flush start");
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
break;
default:
break;
}
ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (encoder, event);
switch (type) {
case GST_EVENT_FLUSH_START:
gst_pad_stop_task (encoder->srcpad);
GST_DEBUG_OBJECT (self, "flush start done");
default:
break;
}
return ret;
}
static GstStateChangeReturn
gst_v4l2_video_enc_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
g_atomic_int_set (&self->active, FALSE);
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static void
gst_v4l2_video_enc_dispose (GObject * object)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
gst_caps_replace (&self->probed_sinkcaps, NULL);
gst_caps_replace (&self->probed_srccaps, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_v4l2_video_enc_finalize (GObject * object)
{
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
gst_v4l2_object_destroy (self->v4l2capture);
gst_v4l2_object_destroy (self->v4l2output);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_v4l2_video_enc_init (GstV4l2VideoEnc * self)
{
/* V4L2 object are created in subinstance_init */
}
static void
gst_v4l2_video_enc_subinstance_init (GTypeInstance * instance, gpointer g_class)
{
GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (instance);
self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
GST_OBJECT (GST_VIDEO_ENCODER_SINK_PAD (self)),
V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
gst_v4l2_get_output, gst_v4l2_set_output, NULL);
self->v4l2output->no_initial_format = TRUE;
self->v4l2output->keep_aspect = FALSE;
self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
GST_OBJECT (GST_VIDEO_ENCODER_SRC_PAD (self)),
V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
}
static void
gst_v4l2_video_enc_class_init (GstV4l2VideoEncClass * klass)
{
GstElementClass *element_class;
GObjectClass *gobject_class;
GstVideoEncoderClass *video_encoder_class;
parent_class = g_type_class_peek_parent (klass);
element_class = (GstElementClass *) klass;
gobject_class = (GObjectClass *) klass;
video_encoder_class = (GstVideoEncoderClass *) klass;
GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_enc_debug, "v4l2videoenc", 0,
"V4L2 Video Encoder");
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finalize);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_get_property);
video_encoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_open);
video_encoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_close);
video_encoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_start);
video_encoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_stop);
video_encoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finish);
video_encoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_flush);
video_encoder_class->set_format =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_format);
video_encoder_class->negotiate =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_negotiate);
video_encoder_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_decide_allocation);
video_encoder_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_propose_allocation);
video_encoder_class->sink_query =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_query);
video_encoder_class->src_query =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_src_query);
video_encoder_class->sink_event =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_event);
video_encoder_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_handle_frame);
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_change_state);
gst_v4l2_object_install_m2m_properties_helper (gobject_class);
}
static void
gst_v4l2_video_enc_subclass_init (gpointer g_class, gpointer data)
{
GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstV4l2VideoEncCData *cdata = data;
klass->default_device = cdata->device;
klass->codec = cdata->codec;
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
cdata->sink_caps));
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
cdata->src_caps));
gst_caps_unref (cdata->sink_caps);
gst_caps_unref (cdata->src_caps);
g_free (cdata);
}
/* Probing functions */
gboolean
gst_v4l2_is_video_enc (GstCaps * sink_caps, GstCaps * src_caps,
GstCaps * codec_caps)
{
gboolean ret = FALSE;
gboolean (*check_caps) (const GstCaps *, const GstCaps *);
if (codec_caps) {
check_caps = gst_caps_can_intersect;
} else {
codec_caps = gst_v4l2_object_get_codec_caps ();
check_caps = gst_caps_is_subset;
}
if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ())
&& check_caps (src_caps, codec_caps))
ret = TRUE;
return ret;
}
void
gst_v4l2_video_enc_register (GstPlugin * plugin, GType type,
const char *codec_name, const gchar * basename, const gchar * device_path,
const GstV4l2Codec * codec, gint video_fd, GstCaps * sink_caps,
GstCaps * codec_caps, GstCaps * src_caps)
{
GstCaps *filtered_caps;
GTypeQuery type_query;
GTypeInfo type_info = { 0, };
GType subtype;
gchar *type_name;
GstV4l2VideoEncCData *cdata;
GValue value = G_VALUE_INIT;
filtered_caps = gst_caps_intersect (src_caps, codec_caps);
if (codec != NULL && video_fd != -1) {
if (gst_v4l2_codec_probe_levels (codec, video_fd, &value)) {
gst_caps_set_value (filtered_caps, "level", &value);
g_value_unset (&value);
}
if (gst_v4l2_codec_probe_profiles (codec, video_fd, &value)) {
gst_caps_set_value (filtered_caps, "profile", &value);
g_value_unset (&value);
}
}
cdata = g_new0 (GstV4l2VideoEncCData, 1);
cdata->device = g_strdup (device_path);
cdata->sink_caps = gst_caps_ref (sink_caps);
cdata->src_caps = gst_caps_ref (filtered_caps);
cdata->codec = codec;
g_type_query (type, &type_query);
memset (&type_info, 0, sizeof (type_info));
type_info.class_size = type_query.class_size;
type_info.instance_size = type_query.instance_size;
type_info.class_init = gst_v4l2_video_enc_subclass_init;
type_info.class_data = cdata;
type_info.instance_init = gst_v4l2_video_enc_subinstance_init;
/* The first encoder to be registered should use a constant name, like
* v4l2h264enc, for any additional encoders, we create unique names. Encoder
* names may change between boots, so this should help gain stable names for
* the most common use cases. */
type_name = g_strdup_printf ("v4l2%senc", codec_name);
if (g_type_from_name (type_name) != 0) {
g_free (type_name);
type_name = g_strdup_printf ("v4l2%s%senc", basename, codec_name);
}
subtype = g_type_register_static (type, type_name, &type_info, 0);
if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype))
GST_WARNING ("Failed to register plugin '%s'", type_name);
g_free (type_name);
}
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