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avcodec/v4l2_context: set frame SAR using VIDIOC_CROPCAP

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Signed-off-by: Aman Gupta <aman@tmm1.net>
This commit is contained in:
Maxime Jourdan 2019-08-30 14:19:12 -07:00 committed by Aman Gupta
parent 0085c4d478
commit b81a1c5bea
3 changed files with 23 additions and 1 deletions
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3
libavcodec/v4l2_buffers.c
View File

@ -428,9 +428,10 @@ int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *avbuf)
frame->pts = v4l2_get_pts(avbuf);
frame->pkt_dts = AV_NOPTS_VALUE;
/* these two values are updated also during re-init in v4l2_process_driver_event */
/* these values are updated also during re-init in v4l2_process_driver_event */
frame->height = avbuf->context->height;
frame->width = avbuf->context->width;
frame->sample_aspect_ratio = avbuf->context->sample_aspect_ratio;
/* 3. report errors upstream */
if (avbuf->buf.flags & V4L2_BUF_FLAG_ERROR) {

20
libavcodec/v4l2_context.c
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@ -63,6 +63,24 @@ static inline unsigned int v4l2_get_height(struct v4l2_format *fmt)
return V4L2_TYPE_IS_MULTIPLANAR(fmt->type) ? fmt->fmt.pix_mp.height : fmt->fmt.pix.height;
}
static AVRational v4l2_get_sar(V4L2Context *ctx)
{
struct AVRational sar = { 0, 1 };
struct v4l2_cropcap cropcap;
int ret;
memset(&cropcap, 0, sizeof(cropcap));
cropcap.type = ctx->type;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_CROPCAP, &cropcap);
if (ret)
return sar;
sar.num = cropcap.pixelaspect.numerator;
sar.den = cropcap.pixelaspect.denominator;
return sar;
}
static inline unsigned int v4l2_resolution_changed(V4L2Context *ctx, struct v4l2_format *fmt2)
{
struct v4l2_format *fmt1 = &ctx->format;
@ -172,12 +190,14 @@ static int v4l2_handle_event(V4L2Context *ctx)
if (full_reinit) {
s->output.height = v4l2_get_height(&out_fmt);
s->output.width = v4l2_get_width(&out_fmt);
s->output.sample_aspect_ratio = v4l2_get_sar(&s->output);
}
reinit = v4l2_resolution_changed(&s->capture, &cap_fmt);
if (reinit) {
s->capture.height = v4l2_get_height(&cap_fmt);
s->capture.width = v4l2_get_width(&cap_fmt);
s->capture.sample_aspect_ratio = v4l2_get_sar(&s->capture);
}
if (full_reinit || reinit)

1
libavcodec/v4l2_context.h
View File

@ -69,6 +69,7 @@ typedef struct V4L2Context {
* or accepts (in case of an output context, e.g. when encoding).
*/
int width, height;
AVRational sample_aspect_ratio;
/**
* Indexed array of V4L2Buffers