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rpicamsrc: Use MMAL PTS and STC to calculate GStreamer timestamps

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Don't apply timestamps based on output time from the encoder,
but use the MMAL STC and capture PTS to generate a GStreamer
timestamp that more accurately resembles the input (and would
preserve reordering should the encoder ever add B-frames).

Fixes https://github.com/thaytan/gst-rpicamsrc/issues/16
This commit is contained in:
Jan Schmidt 2015-03-10 00:22:40 +11:00 committed by Tim-Philipp Müller
parent c3ad9c99a6
commit 8fe0590c29
3 changed files with 50 additions and 6 deletions
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34
sys/rpicamsrc/RaspiCapture.c
View file

@ -911,18 +911,48 @@ static void encoder_buffer_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buf
}
GstFlowReturn
raspi_capture_fill_buffer(RASPIVID_STATE *state, GstBuffer **bufp)
raspi_capture_fill_buffer(RASPIVID_STATE *state, GstBuffer **bufp,
GstClock *clock, GstClockTime base_time)
{
GstBuffer *buf;
MMAL_BUFFER_HEADER_T *buffer;
GstFlowReturn ret = GST_FLOW_ERROR;
/* No timestamps if no clockm or invalid PTS */
GstClockTime gst_pts = GST_CLOCK_TIME_NONE;
/* FIXME: Use our own interruptible cond wait: */
buffer = mmal_queue_wait(state->encoded_buffer_q);
if (G_LIKELY (clock)) {
MMAL_PARAMETER_INT64_T param;
GstClockTime runtime;
runtime = gst_clock_get_time (clock) - base_time;
param.hdr.id = MMAL_PARAMETER_SYSTEM_TIME;
param.hdr.size = sizeof(param);
param.value = -1;
mmal_port_parameter_get(state->encoder_output_port, &param.hdr);
if (param.value != -1 && param.value >= buffer->pts) {
GstClockTime offset = param.value - buffer->pts;
if (runtime >= offset)
gst_pts = runtime - offset;
}
GST_LOG ("Buf PTS %" G_GINT64_FORMAT " DTS %" G_GINT64_FORMAT
" STC %" G_GINT64_FORMAT " TS %" GST_TIME_FORMAT,
buffer->pts, buffer->dts, param.value,
GST_TIME_ARGS (gst_pts));
}
mmal_buffer_header_mem_lock(buffer);
buf = gst_buffer_new_allocate(NULL, buffer->length, NULL);
if (buf) {
/* FIXME: Can we avoid copies and give MMAL our own buffers to fill? */
GST_BUFFER_PTS(buf) = gst_pts;
gst_buffer_fill(buf, 0, buffer->data, buffer->length);
ret = GST_FLOW_OK;
}
@ -1056,7 +1086,7 @@ raspi_capture_set_format_and_start(RASPIVID_STATE *state)
.num_preview_video_frames = 3,
.stills_capture_circular_buffer_height = 0,
.fast_preview_resume = 0,
.use_stc_timestamp = MMAL_PARAM_TIMESTAMP_MODE_RESET_STC
.use_stc_timestamp = MMAL_PARAM_TIMESTAMP_MODE_RAW_STC
};
camera = state->camera_component;

3
sys/rpicamsrc/RaspiCapture.h
View file

@ -101,7 +101,8 @@ void raspicapture_init();
void raspicapture_default_config(RASPIVID_CONFIG *config);
RASPIVID_STATE *raspi_capture_setup(RASPIVID_CONFIG *config);
gboolean raspi_capture_start(RASPIVID_STATE *state);
GstFlowReturn raspi_capture_fill_buffer(RASPIVID_STATE *state, GstBuffer **buf);
GstFlowReturn raspi_capture_fill_buffer(RASPIVID_STATE *state, GstBuffer **buf,
GstClock *clock, GstClockTime base_time);
void raspi_capture_stop(RASPIVID_STATE *state);
void raspi_capture_free(RASPIVID_STATE *state);
gboolean raspi_capture_request_i_frame(RASPIVID_STATE *state);

19
sys/rpicamsrc/gstrpicamsrc.c
View file

@ -435,8 +435,9 @@ gst_rpi_cam_src_init (GstRpiCamSrc * src)
raspicapture_default_config (&src->capture_config);
src->capture_config.intraperiod = KEYFRAME_INTERVAL_DEFAULT;
src->capture_config.verbose = 1;
/* do-timestamping by default for now. FIXME: Implement proper timestamping */
gst_base_src_set_do_timestamp (GST_BASE_SRC (src), TRUE);
/* Don't let basesrc set timestamps, we'll do it using
* buffer PTS and system times */
gst_base_src_set_do_timestamp (GST_BASE_SRC (src), FALSE);
}
static void
@ -862,17 +863,29 @@ gst_rpi_cam_src_create (GstPushSrc * parent, GstBuffer ** buf)
{
GstRpiCamSrc *src = GST_RPICAMSRC (parent);
GstFlowReturn ret;
GstClock *clock = NULL;
GstClockTime base_time;
if (!src->started) {
if (!raspi_capture_start (src->capture_state))
return GST_FLOW_ERROR;
src->started = TRUE;
}
GST_OBJECT_LOCK (src);
if ((clock = GST_ELEMENT_CLOCK (src)) != NULL)
gst_object_ref (clock);
base_time = GST_ELEMENT_CAST (src)->base_time;
GST_OBJECT_UNLOCK (src);
/* FIXME: Use custom allocator */
ret = raspi_capture_fill_buffer (src->capture_state, buf);
ret = raspi_capture_fill_buffer (src->capture_state, buf, clock, base_time);
if (*buf)
GST_LOG_OBJECT (src, "Made buffer of size %" G_GSIZE_FORMAT,
gst_buffer_get_size (*buf));
if (clock)
gst_object_unref (clock);
return ret;
}