mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-19 00:01:23 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/sys/v4l2codecs/gstv4l2codech264dec.c
Nicolas Dufresne 037730a787 v4l2slh264dec: Add slice based decoder support 
This adds support for slice based decoder like the Allwinner/Cedrus driver. In
order to keep things efficient, we hold the sink buffer until we reach the end
of the picture. Note that as we don't know which one is last, we lazy queue the
slices. This effectively introduces one slice latency.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1268>
2020-05-19 17:51:11 +00:00

1193 lines
40 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) 2020 Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gstv4l2codecallocator.h"
#include "gstv4l2codech264dec.h"
#include "gstv4l2codecpool.h"
#include "linux/h264-ctrls.h"
GST_DEBUG_CATEGORY_STATIC (v4l2_h264dec_debug);
#define GST_CAT_DEFAULT v4l2_h264dec_debug
enum
{
PROP_0,
PROP_LAST = PROP_0
};
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE (GST_VIDEO_DECODER_SINK_NAME,
GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264, "
"stream-format=(string) { avc, avc3, byte-stream }, "
"alignment=(string) au")
);
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE (GST_VIDEO_DECODER_SRC_NAME,
GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ NV12, YUY2 }")));
struct _GstV4l2CodecH264Dec
{
GstH264Decoder parent;
GstV4l2Decoder *decoder;
GstVideoCodecState *output_state;
GstVideoInfo vinfo;
gint display_width;
gint display_height;
gint coded_width;
gint coded_height;
guint bitdepth;
guint chroma_format_idc;
GstV4l2CodecAllocator *sink_allocator;
GstV4l2CodecAllocator *src_allocator;
GstV4l2CodecPool *src_pool;
gint min_pool_size;
gboolean has_videometa;
gboolean need_negotiation;
gboolean copy_frames;
struct v4l2_ctrl_h264_sps sps;
struct v4l2_ctrl_h264_pps pps;
struct v4l2_ctrl_h264_scaling_matrix scaling_matrix;
struct v4l2_ctrl_h264_decode_params decode_params;
GArray *slice_params;
enum v4l2_mpeg_video_h264_decode_mode decode_mode;
enum v4l2_mpeg_video_h264_start_code start_code;
GstMemory *bitstream;
GstMapInfo bitstream_map;
};
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstV4l2CodecH264Dec,
gst_v4l2_codec_h264_dec, GST_TYPE_H264_DECODER,
GST_DEBUG_CATEGORY_INIT (v4l2_h264dec_debug, "v4l2codecs-h264dec", 0,
"V4L2 stateless h264 decoder"));
#define parent_class gst_v4l2_codec_h264_dec_parent_class
static gboolean
is_frame_based (GstV4l2CodecH264Dec * self)
{
return self->decode_mode == V4L2_MPEG_VIDEO_H264_DECODE_MODE_FRAME_BASED;
}
static gboolean
is_slice_based (GstV4l2CodecH264Dec * self)
{
return self->decode_mode == V4L2_MPEG_VIDEO_H264_DECODE_MODE_SLICE_BASED;
}
static gboolean
needs_start_codes (GstV4l2CodecH264Dec * self)
{
return self->start_code == V4L2_MPEG_VIDEO_H264_START_CODE_ANNEX_B;
}
static gboolean
gst_v4l2_codec_h264_dec_open (GstVideoDecoder * decoder)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
/* *INDENT-OFF* */
struct v4l2_ext_control control[] = {
{
.id = V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE,
.ptr = &self->decode_mode,
.size = sizeof (self->decode_mode),
},
{
.id = V4L2_CID_MPEG_VIDEO_H264_START_CODE,
.ptr = &self->start_code,
.size = sizeof (self->start_code),
},
};
/* *INDENT-ON* */
if (!gst_v4l2_decoder_open (self->decoder)) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Failed to open H264 decoder"),
("gst_v4l2_decoder_open() failed: %s", g_strerror (errno)));
return FALSE;
}
if (!gst_v4l2_decoder_get_controls (self->decoder, control,
G_N_ELEMENTS (control))) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Driver did not report framing and start code method."),
("gst_v4l2_decoder_get_controls() failed: %s", g_strerror (errno)));
return FALSE;
}
GST_INFO_OBJECT (self, "Opened H264 %s decoder %s",
is_frame_based (self) ? "frame based" : "slice based",
needs_start_codes (self) ? "using start-codes" : "withouth start-codes");
gst_h264_decoder_set_process_ref_pic_lists (GST_H264_DECODER (self),
is_slice_based (self));
return TRUE;
}
static gboolean
gst_v4l2_codec_h264_dec_close (GstVideoDecoder * decoder)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
gst_v4l2_decoder_close (self->decoder);
return TRUE;
}
static void
gst_v4l2_codec_h264_dec_reset_allocation (GstV4l2CodecH264Dec * self)
{
if (self->sink_allocator) {
gst_v4l2_codec_allocator_detach (self->sink_allocator);
g_clear_object (&self->sink_allocator);
}
if (self->src_allocator) {
gst_v4l2_codec_allocator_detach (self->src_allocator);
g_clear_object (&self->src_allocator);
g_clear_object (&self->src_pool);
}
}
static gboolean
gst_v4l2_codec_h264_dec_stop (GstVideoDecoder * decoder)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK);
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC);
gst_v4l2_codec_h264_dec_reset_allocation (self);
if (self->output_state)
gst_video_codec_state_unref (self->output_state);
self->output_state = NULL;
return GST_VIDEO_DECODER_CLASS (parent_class)->stop (decoder);
}
static gboolean
gst_v4l2_codec_h264_dec_negotiate (GstVideoDecoder * decoder)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
GstH264Decoder *h264dec = GST_H264_DECODER (decoder);
/* *INDENT-OFF* */
struct v4l2_ext_control control[] = {
{
.id = V4L2_CID_MPEG_VIDEO_H264_SPS,
.ptr = &self->sps,
.size = sizeof (self->sps),
},
};
/* *INDENT-ON* */
GstCaps *filter, *caps;
/* Ignore downstream renegotiation request. */
if (!self->need_negotiation)
return TRUE;
self->need_negotiation = FALSE;
GST_DEBUG_OBJECT (self, "Negotiate");
gst_v4l2_codec_h264_dec_reset_allocation (self);
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK);
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC);
if (!gst_v4l2_decoder_set_sink_fmt (self->decoder, V4L2_PIX_FMT_H264_SLICE,
self->coded_width, self->coded_height)) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Failed to configure H264 decoder"),
("gst_v4l2_decoder_set_sink_fmt() failed: %s", g_strerror (errno)));
gst_v4l2_decoder_close (self->decoder);
return FALSE;
}
if (!gst_v4l2_decoder_set_controls (self->decoder, NULL, control,
G_N_ELEMENTS (control))) {
GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE,
("Driver does not support the selected stream."), (NULL));
return FALSE;
}
filter = gst_v4l2_decoder_enum_src_formats (self->decoder);
if (!filter) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("No supported decoder output formats"), (NULL));
return FALSE;
}
GST_DEBUG_OBJECT (self, "Supported output formats: %" GST_PTR_FORMAT, filter);
caps = gst_pad_peer_query_caps (decoder->srcpad, filter);
gst_caps_unref (filter);
GST_DEBUG_OBJECT (self, "Peer supported formats: %" GST_PTR_FORMAT, caps);
if (!gst_v4l2_decoder_select_src_format (self->decoder, caps, &self->vinfo)) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Unsupported bitdepth/chroma format"),
("No support for %ux%u %ubit chroma IDC %i", self->coded_width,
self->coded_height, self->bitdepth, self->chroma_format_idc));
gst_caps_unref (caps);
return FALSE;
}
gst_caps_unref (caps);
if (self->output_state)
gst_video_codec_state_unref (self->output_state);
self->output_state =
gst_video_decoder_set_output_state (GST_VIDEO_DECODER (self),
self->vinfo.finfo->format, self->display_width,
self->display_height, h264dec->input_state);
self->output_state->caps = gst_video_info_to_caps (&self->output_state->info);
if (GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder)) {
if (!gst_v4l2_decoder_streamon (self->decoder, GST_PAD_SINK)) {
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
("Could not enable the decoder driver."),
("VIDIOC_STREAMON(SINK) failed: %s", g_strerror (errno)));
return FALSE;
}
if (!gst_v4l2_decoder_streamon (self->decoder, GST_PAD_SRC)) {
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
("Could not enable the decoder driver."),
("VIDIOC_STREAMON(SRC) failed: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
return FALSE;
}
static gboolean
gst_v4l2_codec_h264_dec_decide_allocation (GstVideoDecoder * decoder,
GstQuery * query)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
guint min = 0;
self->has_videometa = gst_query_find_allocation_meta (query,
GST_VIDEO_META_API_TYPE, NULL);
g_clear_object (&self->src_pool);
g_clear_object (&self->src_allocator);
if (gst_query_get_n_allocation_pools (query) > 0)
gst_query_parse_nth_allocation_pool (query, 0, NULL, NULL, &min, NULL);
min = MAX (2, min);
self->sink_allocator = gst_v4l2_codec_allocator_new (self->decoder,
GST_PAD_SINK, self->min_pool_size + 2);
self->src_allocator = gst_v4l2_codec_allocator_new (self->decoder,
GST_PAD_SRC, self->min_pool_size + min + 4);
self->src_pool = gst_v4l2_codec_pool_new (self->src_allocator, &self->vinfo);
/* Our buffer pool is internal, we will let the base class create a video
* pool, and use it if we are running out of buffers or if downstream does
* not support GstVideoMeta */
return GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation
(decoder, query);
}
static void
gst_v4l2_codec_h264_dec_fill_sequence (GstV4l2CodecH264Dec * self,
const GstH264SPS * sps)
{
gint i;
/* *INDENT-OFF* */
self->sps = (struct v4l2_ctrl_h264_sps) {
.profile_idc = sps->profile_idc,
.constraint_set_flags = (sps->constraint_set0_flag)
| (sps->constraint_set1_flag << 1) | (sps->constraint_set2_flag << 2)
| (sps->constraint_set3_flag << 3) | (sps->constraint_set4_flag << 4)
| (sps->constraint_set5_flag << 5),
.level_idc = sps->level_idc,
.seq_parameter_set_id = sps->id,
.chroma_format_idc = sps->chroma_format_idc,
.bit_depth_luma_minus8 = sps->bit_depth_luma_minus8,
.bit_depth_chroma_minus8 = sps->bit_depth_chroma_minus8,
.log2_max_frame_num_minus4 = sps->log2_max_frame_num_minus4,
.pic_order_cnt_type = sps->pic_order_cnt_type,
.log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_pic_order_cnt_lsb_minus4,
.max_num_ref_frames = sps->num_ref_frames,
.num_ref_frames_in_pic_order_cnt_cycle = sps->num_ref_frames_in_pic_order_cnt_cycle,
.offset_for_non_ref_pic = sps->offset_for_non_ref_pic,
.offset_for_top_to_bottom_field = sps->offset_for_top_to_bottom_field,
.pic_width_in_mbs_minus1 = sps->pic_width_in_mbs_minus1,
.pic_height_in_map_units_minus1 = sps->pic_height_in_map_units_minus1,
.flags = (sps->separate_colour_plane_flag ? V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE : 0)
| (sps->qpprime_y_zero_transform_bypass_flag ? V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS : 0)
| (sps->delta_pic_order_always_zero_flag ? V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO : 0)
| (sps->gaps_in_frame_num_value_allowed_flag ? V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED : 0)
| (sps->frame_mbs_only_flag ? V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY : 0)
| (sps->mb_adaptive_frame_field_flag ? V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD : 0)
| (sps->direct_8x8_inference_flag ? V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE : 0),
};
/* *INDENT-ON* */
for (i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++)
self->sps.offset_for_ref_frame[i] = sps->offset_for_ref_frame[i];
}
static void
gst_v4l2_codec_h264_dec_fill_pps (GstV4l2CodecH264Dec * self, GstH264PPS * pps)
{
/* *INDENT-OFF* */
self->pps = (struct v4l2_ctrl_h264_pps) {
.pic_parameter_set_id = pps->id,
.seq_parameter_set_id = pps->sequence->id,
.num_slice_groups_minus1 = pps->num_slice_groups_minus1,
.num_ref_idx_l0_default_active_minus1 = pps->num_ref_idx_l0_active_minus1,
.num_ref_idx_l1_default_active_minus1 = pps->num_ref_idx_l1_active_minus1,
.weighted_bipred_idc = pps->weighted_bipred_idc,
.pic_init_qp_minus26 = pps->pic_init_qp_minus26,
.pic_init_qs_minus26 = pps->pic_init_qs_minus26,
.chroma_qp_index_offset = pps->chroma_qp_index_offset,
.second_chroma_qp_index_offset = pps->second_chroma_qp_index_offset,
.flags = 0
| (pps->entropy_coding_mode_flag ? V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE : 0)
| (pps->pic_order_present_flag ? V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT : 0)
| (pps->weighted_pred_flag ? V4L2_H264_PPS_FLAG_WEIGHTED_PRED : 0)
| (pps->deblocking_filter_control_present_flag ? V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT : 0)
| (pps->constrained_intra_pred_flag ? V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED : 0)
| (pps->redundant_pic_cnt_present_flag ? V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT : 0)
| (pps->transform_8x8_mode_flag ? V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE : 0)
| (pps->pic_scaling_matrix_present_flag ? V4L2_H264_PPS_FLAG_PIC_SCALING_MATRIX_PRESENT : 0),
};
/* *INDENT-ON* */
}
static void
gst_v4l2_codec_h264_dec_fill_scaling_matrix (GstV4l2CodecH264Dec * self,
GstH264PPS * pps)
{
gint i, n;
for (i = 0; i < G_N_ELEMENTS (pps->scaling_lists_4x4); i++)
gst_h264_quant_matrix_4x4_get_raster_from_zigzag (self->
scaling_matrix.scaling_list_4x4[i], pps->scaling_lists_4x4[i]);
/* Avoid uninitialize data passed into ioctl() */
memset (self->scaling_matrix.scaling_list_8x8, 0,
sizeof (self->scaling_matrix.scaling_list_8x8));
/* We need the first 2 entries (Y intra and Y inter for YCbCr 4:2:2 and
* less, and the full 6 entries for 4:4:4, see Table 7-2 of the spec for
* more details */
n = (pps->sequence->chroma_format_idc == 3) ? 6 : 2;
for (i = 0; i < n; i++)
gst_h264_quant_matrix_8x8_get_raster_from_zigzag (self->
scaling_matrix.scaling_list_8x8[i], pps->scaling_lists_8x8[i]);
}
static void
gst_v4l2_codec_h264_dec_fill_decoder_params (GstV4l2CodecH264Dec * self,
GstH264SliceHdr * slice_hdr, GstH264Picture * picture, GstH264Dpb * dpb)
{
GArray *refs = gst_h264_dpb_get_pictures_all (dpb);
gint i;
/* *INDENT-OFF* */
self->decode_params = (struct v4l2_ctrl_h264_decode_params) {
.num_slices = 0, /* will be incremented as we receive slices */
.nal_ref_idc = picture->nal_ref_idc,
.top_field_order_cnt = picture->top_field_order_cnt,
.bottom_field_order_cnt = picture->bottom_field_order_cnt,
.flags = picture->idr ? V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC : 0,
};
for (i = 0; i < refs->len; i++) {
GstH264Picture *ref_pic = g_array_index (refs, GstH264Picture *, i);
gint pic_num = ref_pic->pic_num;
/* Unwrap pic_num */
if (pic_num < 0)
pic_num += slice_hdr->max_pic_num;
self->decode_params.dpb[i] = (struct v4l2_h264_dpb_entry) {
/*
* The reference is multiplied by 1000 because it's wassed as micro
* seconds and this TS is nanosecond.
*/
.reference_ts = (guint64) ref_pic->system_frame_number * 1000,
.frame_num = ref_pic->frame_num,
.pic_num = pic_num,
.top_field_order_cnt = ref_pic->pic_order_cnt,
.bottom_field_order_cnt = ref_pic->bottom_field_order_cnt,
.flags = V4L2_H264_DPB_ENTRY_FLAG_VALID
| (ref_pic->ref ? V4L2_H264_DPB_ENTRY_FLAG_ACTIVE : 0)
| (ref_pic->long_term ? V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM : 0),
};
}
/* *INDENT-ON* */
g_array_unref (refs);
}
static guint
get_slice_header_bit_size (GstH264Slice * slice)
{
return 8 * slice->nalu.header_bytes
+ slice->header.header_size - slice->header.n_emulation_prevention_bytes;
}
static void
gst_v4l2_codec_h264_dec_fill_slice_params (GstV4l2CodecH264Dec * self,
GstH264Slice * slice)
{
gint n = self->decode_params.num_slices++;
gsize slice_size = slice->nalu.size;
struct v4l2_ctrl_h264_slice_params *params;
gint i, j;
/* Ensure array is large enough */
if (self->slice_params->len < self->decode_params.num_slices)
g_array_set_size (self->slice_params, self->slice_params->len * 2);
if (needs_start_codes (self))
slice_size += 3;
/* *INDENT-OFF* */
params = &g_array_index (self->slice_params, struct v4l2_ctrl_h264_slice_params, n);
*params = (struct v4l2_ctrl_h264_slice_params) {
.size = slice_size,
.start_byte_offset = self->bitstream_map.size,
.header_bit_size = get_slice_header_bit_size (slice),
.first_mb_in_slice = slice->header.first_mb_in_slice,
.slice_type = slice->header.type % 5,
.pic_parameter_set_id = slice->header.pps->id,
.colour_plane_id = slice->header.colour_plane_id,
.redundant_pic_cnt = slice->header.redundant_pic_cnt,
.frame_num = slice->header.frame_num,
.idr_pic_id = slice->header.idr_pic_id,
.pic_order_cnt_lsb = slice->header.pic_order_cnt_lsb,
.delta_pic_order_cnt_bottom = slice->header.delta_pic_order_cnt_bottom,
.delta_pic_order_cnt0 = slice->header.delta_pic_order_cnt[0],
.delta_pic_order_cnt1 = slice->header.delta_pic_order_cnt[1],
.pred_weight_table = (struct v4l2_h264_pred_weight_table) {
.luma_log2_weight_denom = slice->header.pred_weight_table.luma_log2_weight_denom,
.chroma_log2_weight_denom = slice->header.pred_weight_table.chroma_log2_weight_denom,
},
.dec_ref_pic_marking_bit_size = slice->header.dec_ref_pic_marking.bit_size,
.pic_order_cnt_bit_size = slice->header.pic_order_cnt_bit_size,
.cabac_init_idc = slice->header.cabac_init_idc,
.slice_qp_delta = slice->header.slice_qp_delta,
.slice_qs_delta = slice->header.slice_qs_delta,
.disable_deblocking_filter_idc = slice->header.disable_deblocking_filter_idc,
.slice_alpha_c0_offset_div2 = slice->header.slice_alpha_c0_offset_div2,
.slice_beta_offset_div2 = slice->header.slice_beta_offset_div2,
.num_ref_idx_l0_active_minus1 = slice->header.num_ref_idx_l0_active_minus1,
.num_ref_idx_l1_active_minus1 = slice->header.num_ref_idx_l1_active_minus1,
.slice_group_change_cycle = slice->header.slice_group_change_cycle,
.flags = (slice->header.field_pic_flag ? V4L2_H264_SLICE_FLAG_FIELD_PIC : 0) |
(slice->header.bottom_field_flag ? V4L2_H264_SLICE_FLAG_BOTTOM_FIELD : 0) |
(slice->header.direct_spatial_mv_pred_flag ? V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED : 0) |
(slice->header.sp_for_switch_flag ? V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH : 0),
};
/* *INDENT-ON* */
for (i = 0; i <= slice->header.num_ref_idx_l0_active_minus1; i++) {
params->pred_weight_table.weight_factors[0].luma_weight[i] =
slice->header.pred_weight_table.luma_weight_l0[i];
params->pred_weight_table.weight_factors[0].luma_offset[i] =
slice->header.pred_weight_table.luma_offset_l0[i];
}
if (slice->header.pps->sequence->chroma_array_type != 0) {
for (i = 0; i <= slice->header.num_ref_idx_l0_active_minus1; i++) {
for (j = 0; j < 2; j++) {
params->pred_weight_table.weight_factors[0].chroma_weight[i][j] =
slice->header.pred_weight_table.chroma_weight_l0[i][j];
params->pred_weight_table.weight_factors[0].chroma_offset[i][j] =
slice->header.pred_weight_table.chroma_offset_l0[i][j];
}
}
}
/* Skip l1 if this is not a B-Frames. */
if (slice->header.type % 5 != GST_H264_B_SLICE)
return;
for (i = 0; i <= slice->header.num_ref_idx_l0_active_minus1; i++) {
params->pred_weight_table.weight_factors[0].luma_weight[i] =
slice->header.pred_weight_table.luma_weight_l0[i];
params->pred_weight_table.weight_factors[0].luma_offset[i] =
slice->header.pred_weight_table.luma_offset_l0[i];
}
if (slice->header.pps->sequence->chroma_array_type != 0) {
for (i = 0; i <= slice->header.num_ref_idx_l1_active_minus1; i++) {
for (j = 0; j < 2; j++) {
params->pred_weight_table.weight_factors[1].chroma_weight[i][j] =
slice->header.pred_weight_table.chroma_weight_l1[i][j];
params->pred_weight_table.weight_factors[1].chroma_offset[i][j] =
slice->header.pred_weight_table.chroma_offset_l1[i][j];
}
}
}
}
static guint8
lookup_dpb_index (struct v4l2_h264_dpb_entry dpb[16], GstH264Picture * ref_pic)
{
guint64 ref_ts;
gint i;
/* Reference list may have wholes in case a ref is missing, we should mark
* the whole and avoid moving items in the list */
if (!ref_pic)
return 0xff;
ref_ts = (guint64) ref_pic->system_frame_number * 1000;
for (i = 0; i < 16; i++) {
if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE
&& dpb[i].reference_ts == ref_ts)
return i;
}
return 0xff;
}
static void
gst_v4l2_codec_h264_dec_fill_references (GstV4l2CodecH264Dec * self,
GArray * ref_pic_list0, GArray * ref_pic_list1)
{
struct v4l2_ctrl_h264_slice_params *slice_params;
gint i;
slice_params = &g_array_index (self->slice_params,
struct v4l2_ctrl_h264_slice_params, 0);
memset (slice_params->ref_pic_list0, 0xff,
sizeof (slice_params->ref_pic_list0));
memset (slice_params->ref_pic_list1, 0xff,
sizeof (slice_params->ref_pic_list1));
for (i = 0; i < ref_pic_list0->len; i++) {
GstH264Picture *ref_pic =
g_array_index (ref_pic_list0, GstH264Picture *, i);
slice_params->ref_pic_list0[i] =
lookup_dpb_index (self->decode_params.dpb, ref_pic);
}
for (i = 0; i < ref_pic_list1->len; i++) {
GstH264Picture *ref_pic =
g_array_index (ref_pic_list1, GstH264Picture *, i);
slice_params->ref_pic_list1[i] =
lookup_dpb_index (self->decode_params.dpb, ref_pic);
}
}
static gboolean
gst_v4l2_codec_h264_dec_new_sequence (GstH264Decoder * decoder,
const GstH264SPS * sps, gint max_dpb_size)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
gint crop_width = sps->width;
gint crop_height = sps->height;
gboolean negotiation_needed = FALSE;
if (self->vinfo.finfo->format == GST_VIDEO_FORMAT_UNKNOWN)
negotiation_needed = TRUE;
/* TODO check if CREATE_BUFS is supported, and simply grow the pool */
if (self->min_pool_size < max_dpb_size) {
self->min_pool_size = max_dpb_size;
negotiation_needed = TRUE;
}
if (sps->frame_cropping_flag) {
crop_width = sps->crop_rect_width;
crop_height = sps->crop_rect_height;
}
/* TODO Check if current buffers are large enough, and reuse them */
if (self->display_width != crop_width || self->display_height != crop_height
|| self->coded_width != sps->width || self->coded_height != sps->height) {
self->display_width = crop_width;
self->display_height = crop_height;
self->coded_width = sps->width;
self->coded_height = sps->height;
negotiation_needed = TRUE;
GST_INFO_OBJECT (self, "Resolution changed to %dx%d (%ix%i)",
self->display_width, self->display_height,
self->coded_width, self->coded_height);
}
if (self->bitdepth != sps->bit_depth_luma_minus8 + 8) {
self->bitdepth = sps->bit_depth_luma_minus8 + 8;
negotiation_needed = TRUE;
GST_INFO_OBJECT (self, "Bitdepth changed to %u", self->bitdepth);
}
if (self->chroma_format_idc != sps->chroma_format_idc) {
self->chroma_format_idc = sps->chroma_format_idc;
negotiation_needed = TRUE;
GST_INFO_OBJECT (self, "Chroma format changed to %i",
self->chroma_format_idc);
}
gst_v4l2_codec_h264_dec_fill_sequence (self, sps);
if (negotiation_needed) {
self->need_negotiation = TRUE;
if (!gst_video_decoder_negotiate (GST_VIDEO_DECODER (self))) {
GST_ERROR_OBJECT (self, "Failed to negotiate with downstream");
return FALSE;
}
}
/* Check if we can zero-copy buffers */
if (!self->has_videometa) {
GstVideoInfo ref_vinfo;
gint i;
gst_video_info_set_format (&ref_vinfo, GST_VIDEO_INFO_FORMAT (&self->vinfo),
self->display_width, self->display_height);
for (i = 0; i < GST_VIDEO_INFO_N_PLANES (&self->vinfo); i++) {
if (self->vinfo.stride[i] != ref_vinfo.stride[i] ||
self->vinfo.offset[i] != ref_vinfo.offset[i]) {
GST_WARNING_OBJECT (self,
"GstVideoMeta support required, copying frames.");
self->copy_frames = TRUE;
break;
}
}
} else {
self->copy_frames = FALSE;
}
return TRUE;
}
static gboolean
gst_v4l2_codec_h264_dec_start_picture (GstH264Decoder * decoder,
GstH264Picture * picture, GstH264Slice * slice, GstH264Dpb * dpb)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
/* FIXME base class should not call us if negotiation failed */
if (!self->sink_allocator)
return FALSE;
/* Ensure we have a bitstream to write into */
if (!self->bitstream) {
self->bitstream = gst_v4l2_codec_allocator_alloc (self->sink_allocator);
if (!self->bitstream) {
GST_ELEMENT_ERROR (decoder, RESOURCE, NO_SPACE_LEFT,
("Not enough memory to decode H264 stream."), (NULL));
return FALSE;
}
if (!gst_memory_map (self->bitstream, &self->bitstream_map, GST_MAP_WRITE)) {
GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE,
("Could not access bitstream memory for writing"), (NULL));
g_clear_pointer (&self->bitstream, gst_memory_unref);
return FALSE;
}
}
/* We use this field to track how much we have written */
self->bitstream_map.size = 0;
gst_v4l2_codec_h264_dec_fill_pps (self, slice->header.pps);
gst_v4l2_codec_h264_dec_fill_scaling_matrix (self, slice->header.pps);
gst_v4l2_codec_h264_dec_fill_decoder_params (self, &slice->header, picture,
dpb);
if (is_frame_based (self))
gst_v4l2_codec_h264_dec_fill_slice_params (self, slice);
return TRUE;
}
static gboolean
gst_v4l2_codec_h264_dec_copy_output_buffer (GstV4l2CodecH264Dec * self,
GstVideoCodecFrame * codec_frame)
{
GstVideoFrame src_frame;
GstVideoFrame dest_frame;
GstVideoInfo dest_vinfo;
GstBuffer *buffer;
gst_video_info_set_format (&dest_vinfo, GST_VIDEO_INFO_FORMAT (&self->vinfo),
self->display_width, self->display_height);
buffer = gst_video_decoder_allocate_output_buffer (GST_VIDEO_DECODER (self));
if (!buffer)
goto fail;
if (!gst_video_frame_map (&src_frame, &self->vinfo,
codec_frame->output_buffer, GST_MAP_READ))
goto fail;
if (!gst_video_frame_map (&dest_frame, &dest_vinfo, buffer, GST_MAP_WRITE)) {
gst_video_frame_unmap (&dest_frame);
goto fail;
}
/* gst_video_frame_copy can crop this, but does not know, so let make it
* think it's all right */
GST_VIDEO_INFO_WIDTH (&src_frame.info) = self->display_width;
GST_VIDEO_INFO_HEIGHT (&src_frame.info) = self->display_height;
if (!gst_video_frame_copy (&dest_frame, &src_frame)) {
gst_video_frame_unmap (&src_frame);
gst_video_frame_unmap (&dest_frame);
goto fail;
}
gst_video_frame_unmap (&src_frame);
gst_video_frame_unmap (&dest_frame);
gst_buffer_replace (&codec_frame->output_buffer, buffer);
gst_buffer_unref (buffer);
return TRUE;
fail:
GST_ERROR_OBJECT (self, "Failed copy output buffer.");
return FALSE;
}
static GstFlowReturn
gst_v4l2_codec_h264_dec_output_picture (GstH264Decoder * decoder,
GstH264Picture * picture)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
GstV4l2Request *request = gst_h264_picture_get_user_data (picture);
gint ret;
guint32 frame_num;
GstVideoCodecFrame *frame, *other_frame;
GstH264Picture *other_pic;
GstV4l2Request *other_request;
GST_DEBUG_OBJECT (self, "Output picture %u", picture->system_frame_number);
if (gst_v4l2_request_is_done (request))
goto finish_frame;
ret = gst_v4l2_request_poll (request, GST_SECOND);
if (ret == 0) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Decoding frame took too long"), (NULL));
return GST_FLOW_ERROR;
} else if (ret < 0) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Decoding request failed: %s", g_strerror (errno)), (NULL));
return GST_FLOW_ERROR;
}
while (TRUE) {
if (!gst_v4l2_decoder_dequeue_src (self->decoder, &frame_num)) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Decoder did not produce a frame"), (NULL));
return GST_FLOW_ERROR;
}
if (frame_num == picture->system_frame_number)
break;
other_frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self),
frame_num);
g_return_val_if_fail (other_frame, GST_FLOW_ERROR);
other_pic = gst_video_codec_frame_get_user_data (other_frame);
other_request = gst_h264_picture_get_user_data (other_pic);
gst_v4l2_request_set_done (other_request);
gst_video_codec_frame_unref (other_frame);
}
finish_frame:
gst_v4l2_request_set_done (request);
frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self),
picture->system_frame_number);
g_return_val_if_fail (frame, GST_FLOW_ERROR);
g_return_val_if_fail (frame->output_buffer, GST_FLOW_ERROR);
/* Hold on reference buffers for the rest of the picture lifetime */
gst_h264_picture_set_user_data (picture,
gst_buffer_ref (frame->output_buffer), (GDestroyNotify) gst_buffer_unref);
if (self->copy_frames)
gst_v4l2_codec_h264_dec_copy_output_buffer (self, frame);
return gst_video_decoder_finish_frame (GST_VIDEO_DECODER (self), frame);
}
static void
gst_v4l2_codec_h264_dec_reset_picture (GstV4l2CodecH264Dec * self)
{
if (self->bitstream) {
if (self->bitstream_map.memory)
gst_memory_unmap (self->bitstream, &self->bitstream_map);
g_clear_pointer (&self->bitstream, gst_memory_unref);
self->bitstream_map = (GstMapInfo) GST_MAP_INFO_INIT;
}
self->decode_params.num_slices = 0;
}
static gboolean
gst_v4l2_codec_h264_dec_submit_bitstream (GstV4l2CodecH264Dec * self,
GstH264Picture * picture, guint flags)
{
GstVideoCodecFrame *frame;
GstV4l2Request *request;
GstBuffer *buffer;
GstFlowReturn flow_ret;
gsize bytesused;
/* *INDENT-OFF* */
struct v4l2_ext_control control[] = {
{
.id = V4L2_CID_MPEG_VIDEO_H264_SPS,
.ptr = &self->sps,
.size = sizeof (self->sps),
},
{
.id = V4L2_CID_MPEG_VIDEO_H264_PPS,
.ptr = &self->pps,
.size = sizeof (self->pps),
},
{
.id = V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX,
.ptr = &self->scaling_matrix,
.size = sizeof (self->scaling_matrix),
},
{
.id = V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS,
.ptr = self->slice_params->data,
.size = g_array_get_element_size (self->slice_params)
* self->decode_params.num_slices,
},
{
.id = V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS,
.ptr = &self->decode_params,
.size = sizeof (self->decode_params),
},
};
/* *INDENT-ON* */
request = gst_v4l2_decoder_alloc_request (self->decoder);
if (!request) {
GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT,
("Failed to allocate a media request object."), (NULL));
goto fail;
}
gst_h264_picture_set_user_data (picture, request,
(GDestroyNotify) gst_v4l2_request_free);
flow_ret = gst_buffer_pool_acquire_buffer (GST_BUFFER_POOL (self->src_pool),
&buffer, NULL);
if (flow_ret != GST_FLOW_OK) {
if (flow_ret == GST_FLOW_FLUSHING)
GST_DEBUG_OBJECT (self, "Frame decoding aborted, we are flushing.");
else
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("No more picture buffer available."), (NULL));
goto fail;
}
frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self),
picture->system_frame_number);
g_return_val_if_fail (frame, FALSE);
g_warn_if_fail (frame->output_buffer == NULL);
frame->output_buffer = buffer;
gst_video_codec_frame_unref (frame);
if (!gst_v4l2_decoder_set_controls (self->decoder, request, control,
G_N_ELEMENTS (control))) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the bitstream parameters."), (NULL));
goto fail;
}
bytesused = self->bitstream_map.size;
gst_memory_unmap (self->bitstream, &self->bitstream_map);
self->bitstream_map = (GstMapInfo) GST_MAP_INFO_INIT;
if (!gst_v4l2_decoder_queue_sink_mem (self->decoder, request, self->bitstream,
picture->system_frame_number, bytesused, flags)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the bitstream data."), (NULL));
goto fail;
}
if (!gst_v4l2_decoder_queue_src_buffer (self->decoder, buffer,
picture->system_frame_number)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the picture buffer."), (NULL));
goto fail;
}
if (!gst_v4l2_request_queue (request)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the decode request."), (NULL));
goto fail;
}
gst_v4l2_codec_h264_dec_reset_picture (self);
return TRUE;
fail:
gst_v4l2_codec_h264_dec_reset_picture (self);
return FALSE;
}
static gboolean
gst_v4l2_codec_h264_dec_decode_slice (GstH264Decoder * decoder,
GstH264Picture * picture, GstH264Slice * slice, GArray * ref_pic_list0,
GArray * ref_pic_list1)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
gsize sc_off = 0;
gsize nal_size;
guint8 *bitstream_data = self->bitstream_map.data + self->bitstream_map.size;
if (is_slice_based (self)) {
/* In slice mode, we submit the pending slice asking the acceletator to hold
* on the picture */
if (self->bitstream_map.size)
gst_v4l2_codec_h264_dec_submit_bitstream (self, picture,
V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF);
gst_v4l2_codec_h264_dec_fill_slice_params (self, slice);
gst_v4l2_codec_h264_dec_fill_references (self, ref_pic_list0,
ref_pic_list1);
}
if (needs_start_codes (self))
sc_off = 3;
nal_size = sc_off + slice->nalu.size;
if (self->bitstream_map.size + nal_size > self->bitstream_map.maxsize) {
GST_ELEMENT_ERROR (decoder, RESOURCE, NO_SPACE_LEFT,
("Not enough space to send all slice of an H264 frame."), (NULL));
return FALSE;
}
if (needs_start_codes (self)) {
bitstream_data[0] = 0x00;
bitstream_data[1] = 0x00;
bitstream_data[2] = 0x01;
}
memcpy (bitstream_data + sc_off, slice->nalu.data + slice->nalu.offset,
slice->nalu.size);
self->bitstream_map.size += nal_size;
return TRUE;
}
static gboolean
gst_v4l2_codec_h264_dec_end_picture (GstH264Decoder * decoder,
GstH264Picture * picture)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
return gst_v4l2_codec_h264_dec_submit_bitstream (self, picture, 0);
}
static void
gst_v4l2_codec_h264_dec_set_flushing (GstV4l2CodecH264Dec * self,
gboolean flushing)
{
if (self->sink_allocator)
gst_v4l2_codec_allocator_set_flushing (self->sink_allocator, flushing);
if (self->src_allocator)
gst_v4l2_codec_allocator_set_flushing (self->src_allocator, flushing);
}
static gboolean
gst_v4l2_codec_h264_dec_flush (GstVideoDecoder * decoder)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
GST_DEBUG_OBJECT (self, "Flushing decoder state.");
gst_v4l2_decoder_flush (self->decoder);
gst_v4l2_codec_h264_dec_set_flushing (self, FALSE);
return GST_VIDEO_DECODER_CLASS (parent_class)->flush (decoder);
}
static gboolean
gst_v4l2_codec_h264_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (self, "flush start");
gst_v4l2_codec_h264_dec_set_flushing (self, TRUE);
break;
default:
break;
}
return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
}
static GstStateChangeReturn
gst_v4l2_codec_h264_dec_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY)
gst_v4l2_codec_h264_dec_set_flushing (self, TRUE);
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static void
gst_v4l2_codec_h264_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (object);
GObject *dec = G_OBJECT (self->decoder);
switch (prop_id) {
default:
gst_v4l2_decoder_set_property (dec, prop_id - PROP_LAST, value, pspec);
break;
}
}
static void
gst_v4l2_codec_h264_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (object);
GObject *dec = G_OBJECT (self->decoder);
switch (prop_id) {
default:
gst_v4l2_decoder_get_property (dec, prop_id - PROP_LAST, value, pspec);
break;
}
}
static void
gst_v4l2_codec_h264_dec_init (GstV4l2CodecH264Dec * self)
{
}
static void
gst_v4l2_codec_h264_dec_subinit (GstV4l2CodecH264Dec * self,
GstV4l2CodecH264DecClass * klass)
{
self->decoder = gst_v4l2_decoder_new (klass->device);
gst_video_info_init (&self->vinfo);
self->slice_params = g_array_sized_new (FALSE, TRUE,
sizeof (struct v4l2_ctrl_h264_slice_params), 4);
}
static void
gst_v4l2_codec_h264_dec_dispose (GObject * object)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (object);
g_clear_object (&self->decoder);
g_clear_pointer (&self->slice_params, g_array_unref);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_v4l2_codec_h264_dec_class_init (GstV4l2CodecH264DecClass * klass)
{
}
static void
gst_v4l2_codec_h264_dec_subclass_init (GstV4l2CodecH264DecClass * klass,
GstV4l2CodecDevice * device)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
GstH264DecoderClass *h264decoder_class = GST_H264_DECODER_CLASS (klass);
gobject_class->set_property = gst_v4l2_codec_h264_dec_set_property;
gobject_class->get_property = gst_v4l2_codec_h264_dec_get_property;
gobject_class->dispose = gst_v4l2_codec_h264_dec_dispose;
gst_element_class_set_static_metadata (element_class,
"V4L2 Stateless H.264 Video Decoder",
"Codec/Decoder/Video/Hardware",
"A V4L2 based H.264 video decoder",
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_add_static_pad_template (element_class, &src_template);
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_change_state);
decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_open);
decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_close);
decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_stop);
decoder_class->negotiate =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_negotiate);
decoder_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_decide_allocation);
decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_flush);
decoder_class->sink_event =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_sink_event);
h264decoder_class->new_sequence =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_new_sequence);
h264decoder_class->output_picture =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_output_picture);
h264decoder_class->start_picture =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_start_picture);
h264decoder_class->decode_slice =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_decode_slice);
h264decoder_class->end_picture =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_end_picture);
klass->device = device;
gst_v4l2_decoder_install_properties (gobject_class, PROP_LAST, device);
}
void
gst_v4l2_codec_h264_dec_register (GstPlugin * plugin,
GstV4l2CodecDevice * device, guint rank)
{
gst_v4l2_decoder_register (plugin, GST_TYPE_V4L2_CODEC_H264_DEC,
(GClassInitFunc) gst_v4l2_codec_h264_dec_subclass_init,
(GInstanceInitFunc) gst_v4l2_codec_h264_dec_subinit,
"v4l2sl%sh264dec", device, rank);
}
Reference in a new issue View git blame Copy permalink