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x264enc: Allow changing the bitrate and quantitizers dynamically

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=621663
This commit is contained in:
Olivier Crête 2010-09-21 20:14:04 -04:00
parent a4df8f9031
commit 62e35a6b40
2 changed files with 53 additions and 4 deletions
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54
ext/x264/gstx264enc.c
View file

@ -574,12 +574,14 @@ gst_x264_enc_class_init (GstX264EncClass * klass)
g_object_class_install_property (gobject_class, ARG_BITRATE,
g_param_spec_uint ("bitrate", "Bitrate", "Bitrate in kbit/sec", 1,
100 * 1024, ARG_BITRATE_DEFAULT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_PLAYING));
g_object_class_install_property (gobject_class, ARG_VBV_BUF_CAPACITY,
g_param_spec_uint ("vbv-buf-capacity", "VBV buffer capacity",
"Size of the VBV buffer in milliseconds",
0, 10000, ARG_VBV_BUF_CAPACITY_DEFAULT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_PLAYING));
#ifdef X264_PRESETS
g_object_class_install_property (gobject_class, ARG_SPEED_PRESET,
@ -1209,6 +1211,8 @@ gst_x264_enc_init_encoder (GstX264Enc * encoder)
}
#endif /* X264_PRESETS */
encoder->reconfig = FALSE;
GST_OBJECT_UNLOCK (encoder);
encoder->x264enc = x264_encoder_open (&encoder->x264param);
@ -1621,6 +1625,14 @@ gst_x264_enc_encode_frame (GstX264Enc * encoder, x264_picture_t * pic_in,
if (G_UNLIKELY (encoder->x264enc == NULL))
return GST_FLOW_NOT_NEGOTIATED;
GST_OBJECT_LOCK (encoder);
if (encoder->reconfig) {
encoder->reconfig = FALSE;
if (x264_encoder_reconfig (encoder->x264enc, &encoder->x264param) < 0)
GST_WARNING_OBJECT (encoder, "Could not reconfigure");
}
GST_OBJECT_UNLOCK (encoder);
encoder_return = x264_encoder_encode (encoder->x264enc,
&nal, i_nal, pic_in, &pic_out);
@ -1759,6 +1771,35 @@ out:
return ret;
}
static void
gst_x264_enc_reconfig (GstX264Enc * encoder)
{
switch (encoder->pass) {
case GST_X264_ENC_PASS_QUAL:
encoder->x264param.rc.f_rf_constant = encoder->quantizer;
encoder->x264param.rc.i_vbv_max_bitrate = encoder->bitrate;
encoder->x264param.rc.i_vbv_buffer_size
= encoder->x264param.rc.i_vbv_max_bitrate
* encoder->vbv_buf_capacity / 1000;
break;
case GST_X264_ENC_PASS_CBR:
case GST_X264_ENC_PASS_PASS1:
case GST_X264_ENC_PASS_PASS2:
case GST_X264_ENC_PASS_PASS3:
default:
encoder->x264param.rc.i_bitrate = encoder->bitrate;
encoder->x264param.rc.i_vbv_max_bitrate = encoder->bitrate;
encoder->x264param.rc.i_vbv_buffer_size
= encoder->x264param.rc.i_vbv_max_bitrate
* encoder->vbv_buf_capacity / 1000;
break;
}
encoder->reconfig = TRUE;
}
static void
gst_x264_enc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
@ -1773,8 +1814,10 @@ gst_x264_enc_set_property (GObject * object, guint prop_id,
GST_OBJECT_LOCK (encoder);
/* state at least matters for sps, bytestream, pass,
* and so by extension ... */
state = GST_STATE (encoder);
if (state != GST_STATE_READY && state != GST_STATE_NULL)
if ((state != GST_STATE_READY && state != GST_STATE_NULL) &&
!(pspec->flags & GST_PARAM_MUTABLE_PLAYING))
goto wrong_state;
switch (prop_id) {
@ -1783,12 +1826,15 @@ gst_x264_enc_set_property (GObject * object, guint prop_id,
break;
case ARG_QUANTIZER:
encoder->quantizer = g_value_get_uint (value);
gst_x264_enc_reconfig (encoder);
break;
case ARG_BITRATE:
encoder->bitrate = g_value_get_uint (value);
gst_x264_enc_reconfig (encoder);
break;
case ARG_VBV_BUF_CAPACITY:
encoder->vbv_buf_capacity = g_value_get_uint (value);
gst_x264_enc_reconfig (encoder);
break;
case ARG_SPEED_PRESET:
encoder->speed_preset = g_value_get_enum (value);
@ -1971,7 +2017,7 @@ gst_x264_enc_set_property (GObject * object, guint prop_id,
/* ERROR */
wrong_state:
{
GST_DEBUG_OBJECT (encoder, "setting property in wrong state");
GST_WARNING_OBJECT (encoder, "setting property in wrong state");
GST_OBJECT_UNLOCK (encoder);
}
}

3
ext/x264/gstx264enc.h
View file

@ -112,6 +112,9 @@ struct _GstX264Enc
gint i_type;
GstEvent *forcekeyunit_event;
/* configuration changed while playing */
gboolean reconfig;
};
struct _GstX264EncClass