gstreamer/sys/v4l2/gstv4l2bufferpool.c

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/* GStreamer
*
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
* 2009 Texas Instruments, Inc - http://www.ti.com/
*
* gstv4l2bufferpool.c V4L2 buffer pool class
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include "gst/video/video.h"
#include <gstv4l2bufferpool.h>
#include "gstv4l2src.h"
#include "gstv4l2sink.h"
#include "v4l2_calls.h"
#include "gst/gst-i18n-plugin.h"
/* videodev2.h is not versioned and we can't easily check for the presence
* of enum values at compile time, but the V4L2_CAP_VIDEO_OUTPUT_OVERLAY define
* was added in the same commit as V4L2_FIELD_INTERLACED_{TB,BT} (b2787845) */
#ifndef V4L2_CAP_VIDEO_OUTPUT_OVERLAY
#define V4L2_FIELD_INTERLACED_TB 8
#define V4L2_FIELD_INTERLACED_BT 9
#endif
GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
#define GST_CAT_DEFAULT v4l2_debug
/*
* GstV4l2Buffer:
*/
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const GstMetaInfo *
gst_meta_v4l2_get_info (void)
{
static const GstMetaInfo *meta_info = NULL;
if (meta_info == NULL) {
meta_info =
gst_meta_register ("GstMetaV4l2", "GstMetaV4l2",
sizeof (GstMetaV4l2), (GstMetaInitFunction) NULL,
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(GstMetaFreeFunction) NULL, (GstMetaCopyFunction) NULL,
(GstMetaTransformFunction) NULL);
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}
return meta_info;
}
static void
gst_v4l2_buffer_dispose (GstBuffer * buffer)
{
GstV4l2BufferPool *pool;
gboolean resuscitated = FALSE;
gint index;
GstMetaV4l2 *meta;
GstV4l2Object *obj;
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meta = GST_META_V4L2_GET (buffer);
g_assert (meta != NULL);
pool = meta->pool;
index = meta->vbuffer.index;
obj = pool->obj;
GST_LOG_OBJECT (obj->element, "finalizing buffer %p %d", buffer, index);
GST_V4L2_BUFFER_POOL_LOCK (pool);
if (pool->running) {
if (pool->requeuebuf) {
if (!gst_v4l2_buffer_pool_qbuf (pool, buffer)) {
GST_WARNING_OBJECT (obj->element, "could not requeue buffer %p %d",
buffer, index);
} else {
resuscitated = TRUE;
}
} else {
resuscitated = TRUE;
/* XXX double check this... I think it is ok to not synchronize this
* w.r.t. destruction of the pool, since the buffer is still live and
* the buffer holds a ref to the pool..
*/
g_async_queue_push (pool->avail_buffers, buffer);
}
} else {
GST_LOG_OBJECT (obj->element, "the pool is shutting down");
}
if (resuscitated) {
GST_LOG_OBJECT (obj->element, "reviving buffer %p, %d", buffer, index);
gst_buffer_ref (buffer);
pool->buffers[index] = buffer;
}
GST_V4L2_BUFFER_POOL_UNLOCK (pool);
if (!resuscitated) {
GST_LOG_OBJECT (obj->element,
"buffer %p (data %p, len %u) not recovered, unmapping",
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buffer, meta->mem, meta->vbuffer.length);
v4l2_munmap (meta->mem, meta->vbuffer.length);
g_object_unref (pool);
}
}
static GstBuffer *
gst_v4l2_buffer_new (GstV4l2BufferPool * pool, guint index)
{
GstBuffer *ret;
GstMetaV4l2 *meta;
GstV4l2Object *obj;
obj = pool->obj;
ret = gst_buffer_new ();
GST_MINI_OBJECT_CAST (ret)->dispose =
(GstMiniObjectDisposeFunction) gst_v4l2_buffer_dispose;
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meta = GST_META_V4L2_ADD (ret);
GST_LOG_OBJECT (obj->element, "creating buffer %u, %p in pool %p", index,
ret, pool);
meta->pool = (GstV4l2BufferPool *) g_object_ref (pool);
meta->vbuffer.index = index;
meta->vbuffer.type = pool->type;
meta->vbuffer.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (pool->video_fd, VIDIOC_QUERYBUF, &meta->vbuffer) < 0)
goto querybuf_failed;
GST_LOG_OBJECT (obj->element, " index: %u", meta->vbuffer.index);
GST_LOG_OBJECT (obj->element, " type: %d", meta->vbuffer.type);
GST_LOG_OBJECT (obj->element, " bytesused: %u", meta->vbuffer.bytesused);
GST_LOG_OBJECT (obj->element, " flags: %08x", meta->vbuffer.flags);
GST_LOG_OBJECT (obj->element, " field: %d", meta->vbuffer.field);
GST_LOG_OBJECT (obj->element, " memory: %d", meta->vbuffer.memory);
if (meta->vbuffer.memory == V4L2_MEMORY_MMAP)
GST_LOG_OBJECT (obj->element, " MMAP offset: %u", meta->vbuffer.m.offset);
GST_LOG_OBJECT (obj->element, " length: %u", meta->vbuffer.length);
GST_LOG_OBJECT (obj->element, " input: %u", meta->vbuffer.input);
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meta->mem = v4l2_mmap (0, meta->vbuffer.length,
PROT_READ | PROT_WRITE, MAP_SHARED, pool->video_fd,
meta->vbuffer.m.offset);
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if (meta->mem == MAP_FAILED)
goto mmap_failed;
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gst_buffer_take_memory (ret, -1,
gst_memory_new_wrapped (0,
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meta->mem, NULL, meta->vbuffer.length, 0, meta->vbuffer.length));
/* add metadata to buffers */
return ret;
/* ERRORS */
querybuf_failed:
{
gint errnosave = errno;
GST_WARNING ("Failed QUERYBUF: %s", g_strerror (errnosave));
gst_buffer_unref (ret);
errno = errnosave;
return NULL;
}
mmap_failed:
{
gint errnosave = errno;
GST_WARNING ("Failed to mmap: %s", g_strerror (errnosave));
gst_buffer_unref (ret);
errno = errnosave;
return NULL;
}
}
/*
* GstV4l2BufferPool:
*/
#define gst_v4l2_buffer_pool_parent_class parent_class
G_DEFINE_TYPE (GstV4l2BufferPool, gst_v4l2_buffer_pool, G_TYPE_OBJECT);
static void
gst_v4l2_buffer_pool_finalize (GObject * object)
{
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
g_mutex_free (pool->lock);
pool->lock = NULL;
g_async_queue_unref (pool->avail_buffers);
pool->avail_buffers = NULL;
if (pool->video_fd >= 0)
v4l2_close (pool->video_fd);
if (pool->buffers) {
g_free (pool->buffers);
pool->buffers = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool)
{
pool->lock = g_mutex_new ();
pool->running = FALSE;
pool->num_live_buffers = 0;
}
static void
gst_v4l2_buffer_pool_class_init (GstV4l2BufferPoolClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gst_v4l2_buffer_pool_finalize;
}
/**
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* gst_v4l2_buffer_pool_new:
* @obj: the v4l2 object owning the pool
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* @num_buffers: the requested number of buffers in the pool
* @requeuebuf: if %TRUE, and if the pool is still in the running state, a
* buffer with no remaining references is immediately passed back to v4l2
* (VIDIOC_QBUF), otherwise it is returned to the pool of available buffers
* (which can be accessed via gst_v4l2_buffer_pool_get().
*
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* Construct a new buffer pool.
*
* Returns: the new pool, use gst_v4l2_buffer_pool_destroy() to free resources
*/
GstV4l2BufferPool *
gst_v4l2_buffer_pool_new (GstV4l2Object * obj, gint num_buffers,
gboolean requeuebuf)
{
GstV4l2BufferPool *pool;
gint n;
struct v4l2_requestbuffers breq;
pool = (GstV4l2BufferPool *) g_object_new (GST_TYPE_V4L2_BUFFER_POOL, NULL);
pool->video_fd = v4l2_dup (obj->video_fd);
if (pool->video_fd < 0)
goto dup_failed;
/* first, lets request buffers, and see how many we can get: */
GST_DEBUG_OBJECT (obj->element, "STREAMING, requesting %d MMAP buffers",
num_buffers);
memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
breq.type = obj->type;
breq.count = num_buffers;
breq.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (pool->video_fd, VIDIOC_REQBUFS, &breq) < 0)
goto reqbufs_failed;
GST_LOG_OBJECT (obj->element, " count: %u", breq.count);
GST_LOG_OBJECT (obj->element, " type: %d", breq.type);
GST_LOG_OBJECT (obj->element, " memory: %d", breq.memory);
if (breq.count < GST_V4L2_MIN_BUFFERS)
goto no_buffers;
if (num_buffers != breq.count) {
GST_WARNING_OBJECT (obj->element, "using %u buffers instead", breq.count);
num_buffers = breq.count;
}
pool->obj = obj;
pool->requeuebuf = requeuebuf;
pool->type = obj->type;
pool->buffer_count = num_buffers;
pool->buffers = g_new0 (GstBuffer *, num_buffers);
pool->avail_buffers = g_async_queue_new ();
/* now, map the buffers: */
for (n = 0; n < num_buffers; n++) {
pool->buffers[n] = gst_v4l2_buffer_new (pool, n);
if (!pool->buffers[n])
goto buffer_new_failed;
pool->num_live_buffers++;
g_async_queue_push (pool->avail_buffers, pool->buffers[n]);
}
return pool;
/* ERRORS */
dup_failed:
{
gint errnosave = errno;
g_object_unref (pool);
errno = errnosave;
return NULL;
}
reqbufs_failed:
{
GST_ELEMENT_ERROR (obj->element, RESOURCE, READ,
(_("Could not get buffers from device '%s'."),
obj->videodev),
("error requesting %d buffers: %s", num_buffers, g_strerror (errno)));
return NULL;
}
no_buffers:
{
GST_ELEMENT_ERROR (obj->element, RESOURCE, READ,
(_("Could not get enough buffers from device '%s'."),
obj->videodev),
("we received %d from device '%s', we want at least %d",
breq.count, obj->videodev, GST_V4L2_MIN_BUFFERS));
return NULL;
}
buffer_new_failed:
{
gint errnosave = errno;
gst_v4l2_buffer_pool_destroy (pool);
errno = errnosave;
return NULL;
}
}
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/**
* gst_v4l2_buffer_pool_destroy:
* @pool: the pool
*
* Free all resources in the pool and the pool itself.
*/
void
gst_v4l2_buffer_pool_destroy (GstV4l2BufferPool * pool)
{
gint n;
GstV4l2Object *obj = pool->obj;
GST_V4L2_BUFFER_POOL_LOCK (pool);
pool->running = FALSE;
GST_V4L2_BUFFER_POOL_UNLOCK (pool);
GST_DEBUG_OBJECT (obj->element, "destroy pool");
/* after this point, no more buffers will be queued or dequeued; no buffer
* from pool->buffers that is NULL will be set to a buffer, and no buffer that
* is not NULL will be pushed out. */
/* miniobjects have no dispose, so they can't break ref-cycles, as buffers ref
* the pool, we need to unref the buffer to properly finalize te pool */
for (n = 0; n < pool->buffer_count; n++) {
GstBuffer *buf;
GST_V4L2_BUFFER_POOL_LOCK (pool);
buf = pool->buffers[n];
GST_V4L2_BUFFER_POOL_UNLOCK (pool);
if (buf)
/* we own the ref if the buffer is in pool->buffers; drop it. */
gst_buffer_unref (buf);
}
g_object_unref (pool);
}
/**
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* gst_v4l2_buffer_pool_get:
* @pool: the "this" object
* @blocking: should this call suspend until there is a buffer available
* in the buffer pool?
*
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* Get an available buffer in the pool
*/
GstBuffer *
gst_v4l2_buffer_pool_get (GstV4l2BufferPool * pool, gboolean blocking)
{
GstBuffer *buf;
if (blocking) {
buf = g_async_queue_pop (pool->avail_buffers);
} else {
buf = g_async_queue_try_pop (pool->avail_buffers);
}
if (buf) {
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GstMetaV4l2 *meta = GST_META_V4L2_GET (buf);
GST_V4L2_BUFFER_POOL_LOCK (pool);
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gst_buffer_resize (buf, 0, meta->vbuffer.length);
GST_BUFFER_FLAG_UNSET (buf, 0xffffffff);
GST_V4L2_BUFFER_POOL_UNLOCK (pool);
}
pool->running = TRUE;
return buf;
}
/**
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* gst_v4l2_buffer_pool_qbuf:
* @pool: the pool
* @buf: the buffer to queue
*
* Queue a buffer to the driver
*
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* Returns: %TRUE for success
*/
gboolean
gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
{
GstMetaV4l2 *meta;
GstV4l2Object *obj = pool->obj;
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meta = GST_META_V4L2_GET (buf);
GST_LOG_OBJECT (obj->element, "enqueue pool buffer %d", meta->vbuffer.index);
if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &meta->vbuffer) < 0)
goto queue_failed;
pool->num_live_buffers--;
GST_DEBUG_OBJECT (obj->element, "num_live_buffers--: %d",
pool->num_live_buffers);
return TRUE;
/* ERRORS */
queue_failed:
{
GST_WARNING_OBJECT (obj->element, "could not queue a buffer");
return FALSE;
}
}
/**
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* gst_v4l2_buffer_pool_dqbuf:
* @pool: the pool
*
* Dequeue a buffer from the driver. Some generic error handling is done in
* this function, but any error handling specific to v4l2src (capture) or
* v4l2sink (output) can be done outside this function by checking 'errno'
*
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* Returns: a buffer
*/
GstBuffer *
gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool)
{
GstBuffer *pool_buffer;
struct v4l2_buffer buffer;
GstV4l2Object *obj = pool->obj;
memset (&buffer, 0x00, sizeof (buffer));
buffer.type = pool->type;
buffer.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) < 0)
goto error;
GST_V4L2_BUFFER_POOL_LOCK (pool);
/* get our GstBuffer with that index from the pool, if the buffer was
* outstanding we have a serious problem.
*/
pool_buffer = pool->buffers[buffer.index];
if (pool_buffer == NULL)
goto no_buffers;
GST_LOG_OBJECT (obj->element,
"grabbed frame %d (ix=%d), flags %08x, pool-ct=%d, buffer=%p",
buffer.sequence, buffer.index, buffer.flags, pool->num_live_buffers,
pool_buffer);
pool->num_live_buffers++;
GST_DEBUG_OBJECT (obj->element, "num_live_buffers++: %d",
pool->num_live_buffers);
/* set top/bottom field first if v4l2_buffer has the information */
if (buffer.field == V4L2_FIELD_INTERLACED_TB)
GST_BUFFER_FLAG_SET (pool_buffer, GST_VIDEO_BUFFER_TFF);
if (buffer.field == V4L2_FIELD_INTERLACED_BT)
GST_BUFFER_FLAG_UNSET (pool_buffer, GST_VIDEO_BUFFER_TFF);
/* this can change at every frame, esp. with jpeg */
gst_buffer_resize (pool_buffer, 0, buffer.bytesused);
GST_V4L2_BUFFER_POOL_UNLOCK (pool);
return pool_buffer;
/* ERRORS */
error:
{
GST_WARNING_OBJECT (obj->element,
"problem grabbing frame %d (ix=%d), pool-ct=%d, buf.flags=%d",
buffer.sequence, buffer.index,
GST_MINI_OBJECT_REFCOUNT (pool), buffer.flags);
switch (errno) {
case EAGAIN:
GST_WARNING_OBJECT (obj->element,
"Non-blocking I/O has been selected using O_NONBLOCK and"
" no buffer was in the outgoing queue. device %s", obj->videodev);
break;
case EINVAL:
GST_ELEMENT_ERROR (obj->element, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'."),
obj->videodev),
(_("The buffer type is not supported, or the index is out of bounds," " or no buffers have been allocated yet, or the userptr" " or length are invalid. device %s"), obj->videodev));
break;
case ENOMEM:
GST_ELEMENT_ERROR (obj->element, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'. Not enough memory."), obj->videodev), (_("insufficient memory to enqueue a user pointer buffer. device %s."), obj->videodev));
break;
case EIO:
GST_INFO_OBJECT (obj->element,
"VIDIOC_DQBUF failed due to an internal error."
" Can also indicate temporary problems like signal loss."
" Note the driver might dequeue an (empty) buffer despite"
" returning an error, or even stop capturing."
" device %s", obj->videodev);
/* have we de-queued a buffer ? */
if (!(buffer.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))) {
GST_DEBUG_OBJECT (obj->element, "reenqueing buffer");
/* FIXME ... should we do something here? */
}
break;
case EINTR:
GST_WARNING_OBJECT (obj->element,
"could not sync on a buffer on device %s", obj->videodev);
break;
default:
GST_WARNING_OBJECT (obj->element,
"Grabbing frame got interrupted on %s unexpectedly. %d: %s.",
obj->videodev, errno, g_strerror (errno));
break;
}
return NULL;
}
no_buffers:
{
GST_ELEMENT_ERROR (obj->element, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'."),
obj->videodev),
(_("No free buffers found in the pool at index %d."), buffer.index));
GST_V4L2_BUFFER_POOL_UNLOCK (pool);
return NULL;
}
}
/**
* gst_v4l2_buffer_pool_available_buffers:
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* @pool: the pool
*
* Check the number of buffers available to the driver, ie. buffers that
* have been QBUF'd but not yet DQBUF'd.
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*
* Returns: the number of buffers available.
*/
gint
gst_v4l2_buffer_pool_available_buffers (GstV4l2BufferPool * pool)
{
return pool->buffer_count - pool->num_live_buffers;
}