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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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encoder: h265: Add CBR Encoding support
https://bugzilla.gnome.org/show_bug.cgi?id=749852
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8e7ebaa505
commit
7ddc7ea0bc
1 changed files with 152 additions and 13 deletions
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@ -45,12 +45,22 @@
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/* Define the maximum IDR period */
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#define MAX_IDR_PERIOD 512
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/* Default CPB length (in milliseconds) */
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#define DEFAULT_CPB_LENGTH 1500
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/* Scale factor for bitrate (HRD bit_rate_scale: min = 6) */
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#define SX_BITRATE 6
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/* Scale factor for CPB size (HRD cpb_size_scale: min = 4) */
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#define SX_CPB_SIZE 4
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/* Define default rate control mode ("constant-qp") */
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#define DEFAULT_RATECONTROL GST_VAAPI_RATECONTROL_CQP
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/* Supported set of VA rate controls, within this implementation */
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#define SUPPORTED_RATECONTROLS \
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(GST_VAAPI_RATECONTROL_MASK (CQP))
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(GST_VAAPI_RATECONTROL_MASK (CQP)) | \
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GST_VAAPI_RATECONTROL_MASK (CBR)
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/* Supported set of tuning options, within this implementation */
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#define SUPPORTED_TUNE_OPTIONS \
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@ -137,6 +147,8 @@ struct _GstVaapiEncoderH265
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GstBuffer *pps_data;
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guint bitrate_bits; // bitrate (bits)
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guint cpb_length; // length of CPB buffer (ms)
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guint cpb_length_bits; // length of CPB buffer (bits)
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/* Crop rectangle */
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guint conformance_window_flag:1;
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@ -413,7 +425,8 @@ bs_write_vps (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
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static gboolean
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bs_write_sps_data (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
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GstVaapiEncPicture * picture,
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const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile)
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const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile,
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const VAEncMiscParameterHRD * hrd_params)
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{
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guint32 video_parameter_set_id = 0;
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guint32 max_sub_layers_minus1 = 0;
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@ -424,6 +437,8 @@ bs_write_sps_data (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
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guint32 num_short_term_ref_pic_sets = 0;
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guint32 long_term_ref_pics_present_flag = 0;
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guint32 sps_extension_flag = 0;
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guint32 nal_hrd_parameters_present_flag = 0;
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guint maxNumSubLayers = 1, i;
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/* video_parameter_set_id */
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WRITE_UINT32 (bs, video_parameter_set_id, 4);
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@ -550,8 +565,45 @@ bs_write_sps_data (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
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/* vui_hrd_parameters_present_flag */
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vui_hrd_parameters_present_flag = seq_param->bits_per_second > 0;
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vui_hrd_parameters_present_flag = FALSE; /* XXX: disabled for now */
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WRITE_UINT32 (bs, vui_hrd_parameters_present_flag, 1);
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if (vui_hrd_parameters_present_flag) {
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nal_hrd_parameters_present_flag = 1;
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/* nal_hrd_parameters_present_flag */
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WRITE_UINT32 (bs, nal_hrd_parameters_present_flag, 1);
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/* vcl_hrd_parameters_present_flag */
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WRITE_UINT32 (bs, 0, 1);
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if (nal_hrd_parameters_present_flag) {
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/* sub_pic_hrd_params_present_flag */
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WRITE_UINT32 (bs, 0, 1);
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/* bit_rate_scale */
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WRITE_UINT32 (bs, SX_BITRATE - 6, 4);
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/* cpb_size_scale */
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WRITE_UINT32 (bs, SX_CPB_SIZE - 4, 4);
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/* initial_cpb_removal_delay_length_minus1 */
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WRITE_UINT32 (bs, 23, 5);
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/* au_cpb_removal_delay_length_minus1 */
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WRITE_UINT32 (bs, 23, 5);
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/* dpb_output_delay_length_minus1 */
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WRITE_UINT32 (bs, 23, 5);
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for (i = 0; i < maxNumSubLayers; i++) {
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/* fixed_pic_rate_general_flag */
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WRITE_UINT32 (bs, 0, 1);
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/* fixed_pic_rate_within_cvs_flag */
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WRITE_UINT32 (bs, 0, 1);
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/* low_delay_hrd_flag */
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WRITE_UINT32 (bs, 1, 1);
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/* bit_rate_value_minus1 */
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WRITE_UE (bs, (seq_param->bits_per_second >> SX_BITRATE) - 1);
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/* cpb_size_value_minus1 */
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WRITE_UE (bs, (hrd_params->buffer_size >> SX_CPB_SIZE) - 1);
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/* cbr_flag */
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WRITE_UINT32 (bs, 1, 1);
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}
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}
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}
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}
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/* bitstream_restriction_flag */
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WRITE_UINT32 (bs, seq_param->vui_fields.bits.bitstream_restriction_flag, 1);
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@ -572,9 +624,10 @@ bs_error:
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static gboolean
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bs_write_sps (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
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GstVaapiEncPicture * picture,
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const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile)
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const VAEncSequenceParameterBufferHEVC * seq_param, GstVaapiProfile profile,
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const VAEncMiscParameterHRD * hrd_params)
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{
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if (!bs_write_sps_data (bs, encoder, picture, seq_param, profile))
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if (!bs_write_sps_data (bs, encoder, picture, seq_param, profile, hrd_params))
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return FALSE;
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/* rbsp_trailing_bits */
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@ -805,7 +858,8 @@ bs_write_slice (GstBitWriter * bs,
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(slice_param->slice_fields.bits.slice_sao_luma_flag
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|| slice_param->slice_fields.bits.slice_sao_chroma_flag
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|| !slice_deblocking_filter_disabled_flag))
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WRITE_UINT32 (bs, slice_param->slice_fields.bits.
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WRITE_UINT32 (bs,
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slice_param->slice_fields.bits.
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slice_loop_filter_across_slices_enabled_flag, 1);
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}
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@ -1115,6 +1169,19 @@ set_key_frame (GstVaapiEncPicture * picture,
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set_i_frame (picture, encoder);
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}
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/* Fills in VA HRD parameters */
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static void
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fill_hrd_params (GstVaapiEncoderH265 * encoder, VAEncMiscParameterHRD * hrd)
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{
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if (encoder->bitrate_bits > 0) {
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hrd->buffer_size = encoder->cpb_length_bits;
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hrd->initial_buffer_fullness = hrd->buffer_size / 2;
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} else {
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hrd->buffer_size = 0;
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hrd->initial_buffer_fullness = 0;
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}
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}
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/* Adds the supplied video parameter set header (VPS) to the list of packed
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headers to pass down as-is to the encoder */
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static gboolean
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@ -1178,14 +1245,17 @@ add_packed_sequence_header (GstVaapiEncoderH265 * encoder,
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const VAEncSequenceParameterBufferHEVC *const seq_param = sequence->param;
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GstVaapiProfile profile = encoder->profile;
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VAEncMiscParameterHRD hrd_params;
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guint32 data_bit_size;
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guint8 *data;
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fill_hrd_params (encoder, &hrd_params);
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gst_bit_writer_init (&bs, 128 * 8);
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WRITE_UINT32 (&bs, 0x00000001, 32); /* start code */
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bs_write_nal_header (&bs, GST_H265_NAL_SPS);
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bs_write_sps (&bs, encoder, picture, seq_param, profile);
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bs_write_sps (&bs, encoder, picture, seq_param, profile, &hrd_params);
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g_assert (GST_BIT_WRITER_BIT_SIZE (&bs) % 8 == 0);
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data_bit_size = GST_BIT_WRITER_BIT_SIZE (&bs);
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@ -1754,6 +1824,25 @@ error_create_packed_seq_hdr:
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}
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}
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static gboolean
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ensure_misc_params (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture)
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{
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GstVaapiEncMiscParam *misc = NULL;
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/* HRD params for rate control */
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if (GST_VAAPI_ENCODER_RATE_CONTROL (encoder) == GST_VAAPI_RATECONTROL_CBR) {
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misc = GST_VAAPI_ENC_MISC_PARAM_NEW (HRD, encoder);
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g_assert (misc);
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if (!misc)
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return FALSE;
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fill_hrd_params (encoder, misc->data);
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gst_vaapi_enc_picture_add_misc_param (picture, misc);
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gst_vaapi_codec_object_replace (&misc, NULL);
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}
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return TRUE;
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}
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/* Generates and submits PPS header accordingly into the bitstream */
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static gboolean
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ensure_picture (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture,
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return TRUE;
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}
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/* Generates slice headers */
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static gboolean
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ensure_slices (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture)
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return TRUE;
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}
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/* Normalizes bitrate (and CPB size) for HRD conformance */
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static void
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ensure_bitrate_hrd (GstVaapiEncoderH265 * encoder)
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{
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GstVaapiEncoder *const base_encoder = GST_VAAPI_ENCODER_CAST (encoder);
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guint bitrate, cpb_size;
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if (!base_encoder->bitrate) {
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encoder->bitrate_bits = 0;
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return;
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}
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/* Round down bitrate. This is a hard limit mandated by the user */
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g_assert (SX_BITRATE >= 6);
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bitrate = (base_encoder->bitrate * 1000) & ~((1U << SX_BITRATE) - 1);
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if (bitrate != encoder->bitrate_bits) {
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GST_DEBUG ("HRD bitrate: %u bits/sec", bitrate);
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encoder->bitrate_bits = bitrate;
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encoder->config_changed = TRUE;
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}
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/* Round up CPB size. This is an HRD compliance detail */
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g_assert (SX_CPB_SIZE >= 4);
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cpb_size = gst_util_uint64_scale (bitrate, encoder->cpb_length, 1000) &
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~((1U << SX_CPB_SIZE) - 1);
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if (cpb_size != encoder->cpb_length_bits) {
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GST_DEBUG ("HRD CPB size: %u bits", cpb_size);
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encoder->cpb_length_bits = cpb_size;
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encoder->config_changed = TRUE;
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}
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}
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/* Estimates a good enough bitrate if none was supplied */
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static void
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ensure_bitrate (GstVaapiEncoderH265 * encoder)
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switch (GST_VAAPI_ENCODER_RATE_CONTROL (encoder)) {
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case GST_VAAPI_RATECONTROL_CBR:
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case GST_VAAPI_RATECONTROL_VBR:
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case GST_VAAPI_RATECONTROL_VBR_CONSTRAINED:
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if (!base_encoder->bitrate) {
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/* Fixme: Provide better estimation */
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/* Using a 1/6 compression ratio */
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base_encoder->bitrate = 0;
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break;
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}
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ensure_bitrate_hrd (encoder);
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}
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/* Constructs profile, tier and level information based on user-defined limits */
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if (!ensure_tier (encoder))
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return GST_VAAPI_ENCODER_STATUS_ERROR_OPERATION_FAILED;
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/* Ensure bitrate if not set already and derive the right level to use */
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ensure_bitrate (encoder);
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if (!ensure_level (encoder))
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/* Ensure bitrate if not set already and derive the right level to use */
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ensure_bitrate (encoder);
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if (!ensure_level (encoder))
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return GST_VAAPI_ENCODER_STATUS_ERROR_OPERATION_FAILED;
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return GST_VAAPI_ENCODER_STATUS_ERROR_OPERATION_FAILED;
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if (encoder->profile != profile || encoder->level != level
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|| encoder->tier != tier) {
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@ -1953,6 +2074,8 @@ gst_vaapi_encoder_h265_encode (GstVaapiEncoder * base_encoder,
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if (!ensure_sequence (encoder, picture))
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goto error;
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if (!ensure_misc_params (encoder, picture))
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goto error;
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if (!ensure_picture (encoder, picture, codedbuf, reconstruct))
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goto error;
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if (!ensure_slices (encoder, picture))
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@ -2408,6 +2531,9 @@ gst_vaapi_encoder_h265_set_property (GstVaapiEncoder * base_encoder,
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case GST_VAAPI_ENCODER_H265_PROP_NUM_SLICES:
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encoder->num_slices = g_value_get_uint (value);
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break;
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case GST_VAAPI_ENCODER_H265_PROP_CPB_LENGTH:
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encoder->cpb_length = g_value_get_uint (value);
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break;
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default:
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return GST_VAAPI_ENCODER_STATUS_ERROR_INVALID_PARAMETER;
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}
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"Number of Slices",
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"Number of slices per frame",
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1, 200, 1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstVaapiEncoderH265:cpb-length:
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*
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* The size of the CPB buffer in milliseconds.
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*/
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GST_VAAPI_ENCODER_PROPERTIES_APPEND (props,
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GST_VAAPI_ENCODER_H265_PROP_CPB_LENGTH,
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g_param_spec_uint ("cpb-length",
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"CPB Length", "Length of the CPB buffer in milliseconds",
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1, 10000, DEFAULT_CPB_LENGTH,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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return props;
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}
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