24 #include <linux/videodev2.h> 25 #include <sys/ioctl.h> 41 if (cap->capabilities & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT) &&
42 cap->capabilities & V4L2_CAP_STREAMING)
45 if (cap->capabilities & V4L2_CAP_VIDEO_M2M)
53 if (cap->capabilities & (V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_OUTPUT_MPLANE) &&
54 cap->capabilities & V4L2_CAP_STREAMING)
57 if (cap->capabilities & V4L2_CAP_VIDEO_M2M_MPLANE)
65 struct v4l2_capability cap;
66 void *log_ctx = s->
avctx;
75 memset(&cap, 0,
sizeof(cap));
76 ret = ioctl(s->
fd, VIDIOC_QUERYCAP, &cap);
81 "driver '%s' on card '%s' in %s mode\n", cap.driver, cap.card,
86 s->
capture.
type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
87 s->
output.
type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
102 void *log_ctx = s->
avctx;
105 s->
fd = open(s->
devname, O_RDWR | O_NONBLOCK, 0);
126 if (close(s->
fd) < 0) {
138 void *log_ctx = s->
avctx;
140 struct v4l2_format ofmt, cfmt;
142 s->
fd = open(s->
devname, O_RDWR | O_NONBLOCK, 0);
154 ofmt.fmt.pix_mp.pixelformat :
155 ofmt.fmt.pix.pixelformat),
157 cfmt.fmt.pix_mp.pixelformat :
158 cfmt.fmt.pix.pixelformat));
190 if (close(s->
fd) < 0) {
207 void *log_ctx = s->
avctx;
250 void *log_ctx = s->
avctx;
368 struct dirent *entry;
373 dirp = opendir(
"/dev");
377 for (entry = readdir(dirp); entry; entry = readdir(dirp)) {
379 if (strncmp(entry->d_name,
"video", 5))
const struct AVCodec * codec
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
const char * name
context name.
int ff_v4l2_context_init(V4L2Context *ctx)
Initializes a V4L2Context.
int av_codec_is_decoder(const AVCodec *codec)
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv)
Releases all the codec resources if all AVBufferRefs have been returned to the ctx.
static void error(const char *err)
void ff_v4l2_context_release(V4L2Context *ctx)
Releases a V4L2Context.
int ff_v4l2_context_set_format(V4L2Context *ctx)
Sets the V4L2Context format in the v4l2 driver.
int ff_v4l2_context_get_format(V4L2Context *ctx, int probe)
Queries the driver for a valid v4l2 format and copies it to the context.
int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv)
Probes the video nodes looking for the required codec capabilities.
int ff_v4l2_m2m_create_context(V4L2m2mPriv *priv, V4L2m2mContext **s)
Allocate a new context and references for a V4L2 M2M instance.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *s)
Reinitializes the V4L2m2mContext when the driver cannot continue processing with the capture paramete...
int done
Either no more buffers available or an unrecoverable error was notified by the V4L2 kernel driver: on...
static int v4l2_probe_driver(V4L2m2mContext *s)
static void v4l2_m2m_destroy_context(void *opaque, uint8_t *context)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define atomic_load(object)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
#define av_fourcc2str(fourcc)
#define sem_destroy(psem)
AVBufferRef * av_buffer_create(uint8_t *data, int size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
struct v4l2_format format
Format returned by the driver after initializing the buffer context.
int ff_v4l2_context_set_status(V4L2Context *ctx, uint32_t cmd)
Sets the status of a V4L2Context.
#define AV_LOG_INFO
Standard information.
Libavcodec external API header.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
int ff_v4l2_m2m_codec_full_reinit(V4L2m2mContext *s)
Reinitializes the V4L2m2mContext when the driver cannot continue processing with the any of the curre...
static int v4l2_configure_contexts(V4L2m2mContext *s)
static int v4l2_splane_video(struct v4l2_capability *cap)
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
static int probe(const AVProbeData *p)
common internal api header.
static int v4l2_prepare_contexts(V4L2m2mContext *s, int probe)
int num_buffers
Readonly after init.
#define atomic_init(obj, value)
AVBufferRef * context_ref
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your local context
enum v4l2_buf_type type
Type of this buffer context.
static int v4l2_mplane_video(struct v4l2_capability *cap)