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avdevice/v4l2: add limited support for multiplanar API

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This commit adds support for V4L2's multiplanar API, but only when the
number of planes is 1.

Adding full support for the multiplanar API would require a device that
actually uses more than 1 plane, which I have not found yet.
release/7.1
Ramiro Polla 6 months ago
parent cf7e2c5e05
commit 7eb37c142a
1 changed files with 64 additions and 27 deletions
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  1. 91
      libavdevice/v4l2.c

91
libavdevice/v4l2.c
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@ -92,6 +92,9 @@ struct video_data {
TimeFilter *timefilter;
int64_t last_time_m;
int multiplanar;
enum v4l2_buf_type buf_type;
int buffers;
atomic_int buffers_queued;
void **buf_start;
@ -182,7 +185,13 @@ static int device_open(AVFormatContext *ctx, const char* device_path)
av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
fd, cap.capabilities);
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) {
s->multiplanar = 0;
s->buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
} else if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) {
s->multiplanar = 1;
s->buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
} else {
av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
err = AVERROR(ENODEV);
goto fail;
@ -206,7 +215,7 @@ static int device_init(AVFormatContext *ctx, int *width, int *height,
uint32_t pixelformat)
{
struct video_data *s = ctx->priv_data;
struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
struct v4l2_format fmt = { .type = s->buf_type };
int res = 0;
fmt.fmt.pix.width = *width;
@ -288,7 +297,7 @@ static void list_framesizes(AVFormatContext *ctx, uint32_t pixelformat)
static void list_formats(AVFormatContext *ctx, int type)
{
const struct video_data *s = ctx->priv_data;
struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
struct v4l2_fmtdesc vfd = { .type = s->buf_type };
while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FMT, &vfd)) {
enum AVCodecID codec_id = ff_fmt_v4l2codec(vfd.pixelformat);
@ -352,7 +361,7 @@ static int mmap_init(AVFormatContext *ctx)
int i, res;
struct video_data *s = ctx->priv_data;
struct v4l2_requestbuffers req = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.type = s->buf_type,
.count = desired_video_buffers,
.memory = V4L2_MEMORY_MMAP
};
@ -381,10 +390,14 @@ static int mmap_init(AVFormatContext *ctx)
}
for (i = 0; i < req.count; i++) {
unsigned int buf_length, buf_offset;
struct v4l2_plane planes[VIDEO_MAX_PLANES];
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.type = s->buf_type,
.index = i,
.memory = V4L2_MEMORY_MMAP
.memory = V4L2_MEMORY_MMAP,
.m.planes = s->multiplanar ? planes : NULL,
.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
};
if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
res = AVERROR(errno);
@ -392,16 +405,28 @@ static int mmap_init(AVFormatContext *ctx)
return res;
}
s->buf_len[i] = buf.length;
if (s->multiplanar) {
if (buf.length != 1) {
av_log(ctx, AV_LOG_ERROR, "multiplanar only supported when buf.length == 1\n");
return AVERROR_PATCHWELCOME;
}
buf_length = buf.m.planes[0].length;
buf_offset = buf.m.planes[0].m.mem_offset;
} else {
buf_length = buf.length;
buf_offset = buf.m.offset;
}
s->buf_len[i] = buf_length;
if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
av_log(ctx, AV_LOG_ERROR,
"buf_len[%d] = %d < expected frame size %d\n",
i, s->buf_len[i], s->frame_size);
return AVERROR(ENOMEM);
}
s->buf_start[i] = v4l2_mmap(NULL, buf.length,
s->buf_start[i] = v4l2_mmap(NULL, buf_length,
PROT_READ | PROT_WRITE, MAP_SHARED,
s->fd, buf.m.offset);
s->fd, buf_offset);
if (s->buf_start[i] == MAP_FAILED) {
res = AVERROR(errno);
@ -429,13 +454,16 @@ static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf)
static void mmap_release_buffer(void *opaque, uint8_t *data)
{
struct v4l2_plane planes[VIDEO_MAX_PLANES];
struct v4l2_buffer buf = { 0 };
struct buff_data *buf_descriptor = opaque;
struct video_data *s = buf_descriptor->s;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.type = s->buf_type;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = buf_descriptor->index;
buf.m.planes = s->multiplanar ? planes : NULL;
buf.length = s->multiplanar ? VIDEO_MAX_PLANES : 0;
av_free(buf_descriptor);
enqueue_buffer(s, &buf);
@ -505,11 +533,15 @@ static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
{
struct video_data *s = ctx->priv_data;
struct v4l2_plane planes[VIDEO_MAX_PLANES];
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.memory = V4L2_MEMORY_MMAP
.type = s->buf_type,
.memory = V4L2_MEMORY_MMAP,
.m.planes = s->multiplanar ? planes : NULL,
.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
};
struct timeval buf_ts;
unsigned int bytesused;
int res;
pkt->size = 0;
@ -536,38 +568,40 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
// always keep at least one buffer queued
av_assert0(atomic_load(&s->buffers_queued) >= 1);
bytesused = s->multiplanar ? buf.m.planes[0].bytesused : buf.bytesused;
#ifdef V4L2_BUF_FLAG_ERROR
if (buf.flags & V4L2_BUF_FLAG_ERROR) {
av_log(ctx, AV_LOG_WARNING,
"Dequeued v4l2 buffer contains corrupted data (%d bytes).\n",
buf.bytesused);
buf.bytesused = 0;
bytesused);
bytesused = 0;
} else
#endif
{
/* CPIA is a compressed format and we don't know the exact number of bytes
* used by a frame, so set it here as the driver announces it. */
if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
s->frame_size = buf.bytesused;
s->frame_size = bytesused;
if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
if (s->frame_size > 0 && bytesused != s->frame_size) {
av_log(ctx, AV_LOG_WARNING,
"Dequeued v4l2 buffer contains %d bytes, but %d were expected. Flags: 0x%08X.\n",
buf.bytesused, s->frame_size, buf.flags);
buf.bytesused = 0;
bytesused, s->frame_size, buf.flags);
bytesused = 0;
}
}
/* Image is at s->buff_start[buf.index] */
if (atomic_load(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
/* when we start getting low on queued buffers, fall back on copying data */
res = av_new_packet(pkt, buf.bytesused);
res = av_new_packet(pkt, bytesused);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
enqueue_buffer(s, &buf);
return res;
}
memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
memcpy(pkt->data, s->buf_start[buf.index], bytesused);
res = enqueue_buffer(s, &buf);
if (res) {
@ -578,7 +612,7 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
struct buff_data *buf_descriptor;
pkt->data = s->buf_start[buf.index];
pkt->size = buf.bytesused;
pkt->size = bytesused;
buf_descriptor = av_malloc(sizeof(struct buff_data));
if (!buf_descriptor) {
@ -615,10 +649,13 @@ static int mmap_start(AVFormatContext *ctx)
int i, res;
for (i = 0; i < s->buffers; i++) {
struct v4l2_plane planes[VIDEO_MAX_PLANES];
struct v4l2_buffer buf = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.type = s->buf_type,
.index = i,
.memory = V4L2_MEMORY_MMAP
.memory = V4L2_MEMORY_MMAP,
.m.planes = s->multiplanar ? planes : NULL,
.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
};
if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
@ -630,7 +667,7 @@ static int mmap_start(AVFormatContext *ctx)
}
atomic_store(&s->buffers_queued, s->buffers);
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
type = s->buf_type;
if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
res = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
@ -646,7 +683,7 @@ static void mmap_close(struct video_data *s)
enum v4l2_buf_type type;
int i;
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
type = s->buf_type;
/* We do not check for the result, because we could
* not do anything about it anyway...
*/
@ -733,7 +770,7 @@ static int v4l2_set_parameters(AVFormatContext *ctx)
tpf = &streamparm.parm.capture.timeperframe;
}
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
streamparm.type = s->buf_type;
if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
ret = AVERROR(errno);
av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
@ -921,7 +958,7 @@ static int v4l2_read_header(AVFormatContext *ctx)
}
if (!s->width && !s->height) {
struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
struct v4l2_format fmt = { .type = s->buf_type };
av_log(ctx, AV_LOG_VERBOSE,
"Querying the device for the current frame size\n");

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