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encoder: h265: Add CBR Encoding support

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https://bugzilla.gnome.org/show_bug.cgi?id=749852
This commit is contained in:
Sreerenj Balachandran 2016-04-27 17:06:09 +03:00
parent 8e7ebaa505
commit 7ddc7ea0bc
1 changed files with 152 additions and 13 deletions
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165
gst-libs/gst/vaapi/gstvaapiencoder_h265.c
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@ -45,12 +45,22 @@
/* Define the maximum IDR period */
#define MAX_IDR_PERIOD 512
/* Default CPB length (in milliseconds) */
#define DEFAULT_CPB_LENGTH 1500
/* Scale factor for bitrate (HRD bit_rate_scale: min = 6) */
#define SX_BITRATE 6
/* Scale factor for CPB size (HRD cpb_size_scale: min = 4) */
#define SX_CPB_SIZE 4
/* Define default rate control mode ("constant-qp") */
#define DEFAULT_RATECONTROL GST_VAAPI_RATECONTROL_CQP
/* Supported set of VA rate controls, within this implementation */
#define SUPPORTED_RATECONTROLS \
(GST_VAAPI_RATECONTROL_MASK (CQP))
(GST_VAAPI_RATECONTROL_MASK (CQP)) | \
GST_VAAPI_RATECONTROL_MASK (CBR)
/* Supported set of tuning options, within this implementation */
#define SUPPORTED_TUNE_OPTIONS \
@ -137,6 +147,8 @@ struct _GstVaapiEncoderH265
GstBuffer *pps_data;
guint bitrate_bits; // bitrate (bits)
guint cpb_length; // length of CPB buffer (ms)
guint cpb_length_bits; // length of CPB buffer (bits)
/* Crop rectangle */
guint conformance_window_flag:1;
@ -413,7 +425,8 @@ bs_write_vps (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
static gboolean
bs_write_sps_data (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
GstVaapiEncPicture * picture,
const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile)
const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile,
const VAEncMiscParameterHRD * hrd_params)
{
guint32 video_parameter_set_id = 0;
guint32 max_sub_layers_minus1 = 0;
@ -424,6 +437,8 @@ bs_write_sps_data (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
guint32 num_short_term_ref_pic_sets = 0;
guint32 long_term_ref_pics_present_flag = 0;
guint32 sps_extension_flag = 0;
guint32 nal_hrd_parameters_present_flag = 0;
guint maxNumSubLayers = 1, i;
/* video_parameter_set_id */
WRITE_UINT32 (bs, video_parameter_set_id, 4);
@ -550,8 +565,45 @@ bs_write_sps_data (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
/* vui_hrd_parameters_present_flag */
vui_hrd_parameters_present_flag = seq_param->bits_per_second > 0;
vui_hrd_parameters_present_flag = FALSE; /* XXX: disabled for now */
WRITE_UINT32 (bs, vui_hrd_parameters_present_flag, 1);
if (vui_hrd_parameters_present_flag) {
nal_hrd_parameters_present_flag = 1;
/* nal_hrd_parameters_present_flag */
WRITE_UINT32 (bs, nal_hrd_parameters_present_flag, 1);
/* vcl_hrd_parameters_present_flag */
WRITE_UINT32 (bs, 0, 1);
if (nal_hrd_parameters_present_flag) {
/* sub_pic_hrd_params_present_flag */
WRITE_UINT32 (bs, 0, 1);
/* bit_rate_scale */
WRITE_UINT32 (bs, SX_BITRATE - 6, 4);
/* cpb_size_scale */
WRITE_UINT32 (bs, SX_CPB_SIZE - 4, 4);
/* initial_cpb_removal_delay_length_minus1 */
WRITE_UINT32 (bs, 23, 5);
/* au_cpb_removal_delay_length_minus1 */
WRITE_UINT32 (bs, 23, 5);
/* dpb_output_delay_length_minus1 */
WRITE_UINT32 (bs, 23, 5);
for (i = 0; i < maxNumSubLayers; i++) {
/* fixed_pic_rate_general_flag */
WRITE_UINT32 (bs, 0, 1);
/* fixed_pic_rate_within_cvs_flag */
WRITE_UINT32 (bs, 0, 1);
/* low_delay_hrd_flag */
WRITE_UINT32 (bs, 1, 1);
/* bit_rate_value_minus1 */
WRITE_UE (bs, (seq_param->bits_per_second >> SX_BITRATE) - 1);
/* cpb_size_value_minus1 */
WRITE_UE (bs, (hrd_params->buffer_size >> SX_CPB_SIZE) - 1);
/* cbr_flag */
WRITE_UINT32 (bs, 1, 1);
}
}
}
}
/* bitstream_restriction_flag */
WRITE_UINT32 (bs, seq_param->vui_fields.bits.bitstream_restriction_flag, 1);
@ -572,9 +624,10 @@ bs_error:
static gboolean
bs_write_sps (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
GstVaapiEncPicture * picture,
const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile)
const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile,
const VAEncMiscParameterHRD * hrd_params)
{
if (!bs_write_sps_data (bs, encoder, picture, seq_param, profile))
if (!bs_write_sps_data (bs, encoder, picture, seq_param, profile, hrd_params))
return FALSE;
/* rbsp_trailing_bits */
@ -805,7 +858,8 @@ bs_write_slice (GstBitWriter * bs,
(slice_param->slice_fields.bits.slice_sao_luma_flag
|| slice_param->slice_fields.bits.slice_sao_chroma_flag
|| !slice_deblocking_filter_disabled_flag))
WRITE_UINT32 (bs, slice_param->slice_fields.bits.
WRITE_UINT32 (bs,
slice_param->slice_fields.bits.
slice_loop_filter_across_slices_enabled_flag, 1);
}
@ -1115,6 +1169,19 @@ set_key_frame (GstVaapiEncPicture * picture,
set_i_frame (picture, encoder);
}
/* Fills in VA HRD parameters */
static void
fill_hrd_params (GstVaapiEncoderH265 * encoder, VAEncMiscParameterHRD * hrd)
{
if (encoder->bitrate_bits > 0) {
hrd->buffer_size = encoder->cpb_length_bits;
hrd->initial_buffer_fullness = hrd->buffer_size / 2;
} else {
hrd->buffer_size = 0;
hrd->initial_buffer_fullness = 0;
}
}
/* Adds the supplied video parameter set header (VPS) to the list of packed
headers to pass down as-is to the encoder */
static gboolean
@ -1178,14 +1245,17 @@ add_packed_sequence_header (GstVaapiEncoderH265 * encoder,
const VAEncSequenceParameterBufferHEVC *const seq_param = sequence->param;
GstVaapiProfile profile = encoder->profile;
VAEncMiscParameterHRD hrd_params;
guint32 data_bit_size;
guint8 *data;
fill_hrd_params (encoder, &hrd_params);
gst_bit_writer_init (&bs, 128 * 8);
WRITE_UINT32 (&bs, 0x00000001, 32); /* start code */
bs_write_nal_header (&bs, GST_H265_NAL_SPS);
bs_write_sps (&bs, encoder, picture, seq_param, profile);
bs_write_sps (&bs, encoder, picture, seq_param, profile, &hrd_params);
g_assert (GST_BIT_WRITER_BIT_SIZE (&bs) % 8 == 0);
data_bit_size = GST_BIT_WRITER_BIT_SIZE (&bs);
@ -1754,6 +1824,25 @@ error_create_packed_seq_hdr:
}
}
static gboolean
ensure_misc_params (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture)
{
GstVaapiEncMiscParam *misc = NULL;
/* HRD params for rate control */
if (GST_VAAPI_ENCODER_RATE_CONTROL (encoder) == GST_VAAPI_RATECONTROL_CBR) {
misc = GST_VAAPI_ENC_MISC_PARAM_NEW (HRD, encoder);
g_assert (misc);
if (!misc)
return FALSE;
fill_hrd_params (encoder, misc->data);
gst_vaapi_enc_picture_add_misc_param (picture, misc);
gst_vaapi_codec_object_replace (&misc, NULL);
}
return TRUE;
}
/* Generates and submits PPS header accordingly into the bitstream */
static gboolean
ensure_picture (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture,
@ -1778,6 +1867,7 @@ ensure_picture (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture,
return TRUE;
}
/* Generates slice headers */
static gboolean
ensure_slices (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture)
@ -1809,6 +1899,38 @@ ensure_slices (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture)
return TRUE;
}
/* Normalizes bitrate (and CPB size) for HRD conformance */
static void
ensure_bitrate_hrd (GstVaapiEncoderH265 * encoder)
{
GstVaapiEncoder *const base_encoder = GST_VAAPI_ENCODER_CAST (encoder);
guint bitrate, cpb_size;
if (!base_encoder->bitrate) {
encoder->bitrate_bits = 0;
return;
}
/* Round down bitrate. This is a hard limit mandated by the user */
g_assert (SX_BITRATE >= 6);
bitrate = (base_encoder->bitrate * 1000) & ~((1U << SX_BITRATE) - 1);
if (bitrate != encoder->bitrate_bits) {
GST_DEBUG ("HRD bitrate: %u bits/sec", bitrate);
encoder->bitrate_bits = bitrate;
encoder->config_changed = TRUE;
}
/* Round up CPB size. This is an HRD compliance detail */
g_assert (SX_CPB_SIZE >= 4);
cpb_size = gst_util_uint64_scale (bitrate, encoder->cpb_length, 1000) &
~((1U << SX_CPB_SIZE) - 1);
if (cpb_size != encoder->cpb_length_bits) {
GST_DEBUG ("HRD CPB size: %u bits", cpb_size);
encoder->cpb_length_bits = cpb_size;
encoder->config_changed = TRUE;
}
}
/* Estimates a good enough bitrate if none was supplied */
static void
ensure_bitrate (GstVaapiEncoderH265 * encoder)
@ -1817,8 +1939,6 @@ ensure_bitrate (GstVaapiEncoderH265 * encoder)
switch (GST_VAAPI_ENCODER_RATE_CONTROL (encoder)) {
case GST_VAAPI_RATECONTROL_CBR:
case GST_VAAPI_RATECONTROL_VBR:
case GST_VAAPI_RATECONTROL_VBR_CONSTRAINED:
if (!base_encoder->bitrate) {
/* Fixme: Provide better estimation */
/* Using a 1/6 compression ratio */
@ -1834,6 +1954,7 @@ ensure_bitrate (GstVaapiEncoderH265 * encoder)
base_encoder->bitrate = 0;
break;
}
ensure_bitrate_hrd (encoder);
}
/* Constructs profile, tier and level information based on user-defined limits */
@ -1859,11 +1980,11 @@ ensure_profile_tier_level (GstVaapiEncoderH265 * encoder)
if (!ensure_tier (encoder))
return GST_VAAPI_ENCODER_STATUS_ERROR_OPERATION_FAILED;
/* Ensure bitrate if not set already and derive the right level to use */
ensure_bitrate (encoder);
if (!ensure_level (encoder))
/* Ensure bitrate if not set already and derive the right level to use */
ensure_bitrate (encoder);
if (!ensure_level (encoder))
return GST_VAAPI_ENCODER_STATUS_ERROR_OPERATION_FAILED;
return GST_VAAPI_ENCODER_STATUS_ERROR_OPERATION_FAILED;
if (encoder->profile != profile || encoder->level != level
|| encoder->tier != tier) {
@ -1953,6 +2074,8 @@ gst_vaapi_encoder_h265_encode (GstVaapiEncoder * base_encoder,
if (!ensure_sequence (encoder, picture))
goto error;
if (!ensure_misc_params (encoder, picture))
goto error;
if (!ensure_picture (encoder, picture, codedbuf, reconstruct))
goto error;
if (!ensure_slices (encoder, picture))
@ -2408,6 +2531,9 @@ gst_vaapi_encoder_h265_set_property (GstVaapiEncoder * base_encoder,
case GST_VAAPI_ENCODER_H265_PROP_NUM_SLICES:
encoder->num_slices = g_value_get_uint (value);
break;
case GST_VAAPI_ENCODER_H265_PROP_CPB_LENGTH:
encoder->cpb_length = g_value_get_uint (value);
break;
default:
return GST_VAAPI_ENCODER_STATUS_ERROR_INVALID_PARAMETER;
}
@ -2508,6 +2634,19 @@ gst_vaapi_encoder_h265_get_default_properties (void)
"Number of Slices",
"Number of slices per frame",
1, 200, 1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstVaapiEncoderH265:cpb-length:
*
* The size of the CPB buffer in milliseconds.
*/
GST_VAAPI_ENCODER_PROPERTIES_APPEND (props,
GST_VAAPI_ENCODER_H265_PROP_CPB_LENGTH,
g_param_spec_uint ("cpb-length",
"CPB Length", "Length of the CPB buffer in milliseconds",
1, 10000, DEFAULT_CPB_LENGTH,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
return props;
}