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v4l2: encoder: Add dynamic framerate support
This is not trully supported in V4L2, but we can emulate this similar to what other elements do. In this patch we ensure that 0/1 is supported by encoders (caps query),and uses a default of 30fps whenever we need to set a framerate into the driver. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7352>
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5182cac9be
commit
ee925c506c
2 changed files with 38 additions and 9 deletions
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@ -4380,15 +4380,25 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
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goto done;
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}
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/* Note: V4L2 wants the frame interval, we have the frame rate */
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streamparm.parm.capture.timeperframe.numerator = fps_d;
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streamparm.parm.capture.timeperframe.denominator = fps_n;
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/* Variable framerate is not a V4L2 concept, simply default to 30fps */
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if (fps_n == 0 && fps_d == 1) {
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GST_DEBUG_OBJECT (v4l2object->dbg_obj,
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"Variable framerate not supported, assuming 30fps");
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streamparm.parm.capture.timeperframe.numerator = 1;
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streamparm.parm.capture.timeperframe.denominator = 30;
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} else {
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/* Note: V4L2 wants the frame interval, we have the frame rate */
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streamparm.parm.capture.timeperframe.numerator = fps_d;
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streamparm.parm.capture.timeperframe.denominator = fps_n;
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}
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/* some cheap USB cam's won't accept any change */
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if (v4l2object->ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0)
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goto set_parm_failed;
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if (streamparm.parm.capture.timeperframe.numerator > 0 &&
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if (fps_n == 0 && fps_d == 1) {
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/* just keep reporting variable framerate */
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} else if (streamparm.parm.capture.timeperframe.numerator > 0 &&
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streamparm.parm.capture.timeperframe.denominator > 0) {
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/* get new values */
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fps_d = streamparm.parm.capture.timeperframe.numerator;
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@ -4423,14 +4433,24 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
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goto done;
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}
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/* Note: V4L2 wants the frame interval, we have the frame rate */
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streamparm.parm.output.timeperframe.numerator = fps_d;
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streamparm.parm.output.timeperframe.denominator = fps_n;
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/* Variable framerate is not a V4L2 concept, simply default to 30fps */
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if (fps_n == 0 && fps_d == 1) {
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GST_DEBUG_OBJECT (v4l2object->dbg_obj,
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"Variable framerate not supported, assuming 30fps");
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streamparm.parm.output.timeperframe.numerator = 1;
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streamparm.parm.output.timeperframe.denominator = 30;
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} else {
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/* Note: V4L2 wants the frame interval, we have the frame rate */
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streamparm.parm.output.timeperframe.numerator = fps_d;
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streamparm.parm.output.timeperframe.denominator = fps_n;
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}
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if (v4l2object->ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0)
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goto set_parm_failed;
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if (streamparm.parm.output.timeperframe.numerator > 0 &&
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if (fps_n == 0 && fps_d == 1) {
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/* just keep reporting variable framerate */
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} else if (streamparm.parm.output.timeperframe.numerator > 0 &&
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streamparm.parm.output.timeperframe.denominator > 0) {
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/* get new values */
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fps_d = streamparm.parm.output.timeperframe.numerator;
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@ -111,7 +111,7 @@ gst_v4l2_video_enc_open (GstVideoEncoder * encoder)
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{
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GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
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GstV4l2Error error = GST_V4L2_ERROR_INIT;
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GstCaps *codec_caps;
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GstCaps *tmp_caps, *codec_caps;
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GST_DEBUG_OBJECT (self, "Opening");
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@ -124,6 +124,15 @@ gst_v4l2_video_enc_open (GstVideoEncoder * encoder)
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self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output,
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gst_v4l2_object_get_raw_caps ());
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/*
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* Relax the framerate to always allow 0/1 regardless of what the driver
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* wants. This improve compatibility of the encoder with sources which may
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* not know the frame rate
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*/
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tmp_caps = gst_caps_copy (self->probed_sinkcaps);
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gst_caps_set_simple (tmp_caps, "framerate", GST_TYPE_FRACTION, 0, 1, NULL);
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gst_caps_append (self->probed_sinkcaps, tmp_caps);
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if (gst_caps_is_empty (self->probed_sinkcaps))
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goto no_raw_format;
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