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gstreamer/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codech264dec.c
Dmitry Osipenko fd694d840a v4l2codecs: h264: Set frame type flags 
V4L spec now requires decode_params flags to be set in accordance to the
frame's type. In particular this is required by H.264 decoder of NVIDIA
Tegra SoC to operate properly. Set the flags based on type of parsed
slices.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1757>
2022-05-06 13:35:59 +00:00

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/* 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 "gstv4l2format.h"
#include "linux/v4l2-controls.h"
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#define V4L2_MIN_KERNEL_VER_MAJOR 5
#define V4L2_MIN_KERNEL_VER_MINOR 11
#define V4L2_MIN_KERNEL_VERSION KERNEL_VERSION(V4L2_MIN_KERNEL_VER_MAJOR, V4L2_MIN_KERNEL_VER_MINOR, 0)
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 (GST_V4L2_DEFAULT_VIDEO_FORMATS)));
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;
guint num_slices;
gboolean first_slice;
GstV4l2CodecAllocator *sink_allocator;
GstV4l2CodecAllocator *src_allocator;
GstV4l2CodecPool *src_pool;
gint min_pool_size;
gboolean has_videometa;
gboolean need_negotiation;
gboolean interlaced;
gboolean need_sequence;
gboolean copy_frames;
gboolean scaling_matrix_present;
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;
struct v4l2_ctrl_h264_pred_weights pred_weight;
GArray *slice_params;
enum v4l2_stateless_h264_decode_mode decode_mode;
enum v4l2_stateless_h264_start_code start_code;
GstMemory *bitstream;
GstMapInfo bitstream_map;
};
G_DEFINE_ABSTRACT_TYPE (GstV4l2CodecH264Dec, gst_v4l2_codec_h264_dec,
GST_TYPE_H264_DECODER);
#define parent_class gst_v4l2_codec_h264_dec_parent_class
static gboolean
is_frame_based (GstV4l2CodecH264Dec * self)
{
return self->decode_mode == V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED;
}
static gboolean
is_slice_based (GstV4l2CodecH264Dec * self)
{
return self->decode_mode == V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED;
}
static gboolean
needs_start_codes (GstV4l2CodecH264Dec * self)
{
return self->start_code == V4L2_STATELESS_H264_START_CODE_ANNEX_B;
}
static gboolean
gst_v4l2_decoder_h264_api_check (GstV4l2Decoder * decoder)
{
guint i, ret_size;
/* *INDENT-OFF* */
#define SET_ID(cid) .id = (cid), .name = #cid
struct
{
const gchar *name;
unsigned int id;
unsigned int size;
gboolean optional;
} controls[] = {
{
SET_ID (V4L2_CID_STATELESS_H264_SPS),
.size = sizeof(struct v4l2_ctrl_h264_sps),
}, {
SET_ID (V4L2_CID_STATELESS_H264_PPS),
.size = sizeof(struct v4l2_ctrl_h264_pps),
}, {
SET_ID (V4L2_CID_STATELESS_H264_SCALING_MATRIX),
.size = sizeof(struct v4l2_ctrl_h264_scaling_matrix),
.optional = TRUE,
}, {
SET_ID (V4L2_CID_STATELESS_H264_DECODE_PARAMS),
.size = sizeof(struct v4l2_ctrl_h264_decode_params),
}, {
SET_ID (V4L2_CID_STATELESS_H264_SLICE_PARAMS),
.size = sizeof(struct v4l2_ctrl_h264_slice_params),
.optional = TRUE,
}, {
SET_ID (V4L2_CID_STATELESS_H264_PRED_WEIGHTS),
.size = sizeof(struct v4l2_ctrl_h264_pred_weights),
.optional = TRUE,
}
};
#undef SET_ID
/* *INDENT-ON* */
/*
* Compatibility check: make sure the pointer controls are
* the right size.
*/
for (i = 0; i < G_N_ELEMENTS (controls); i++) {
gboolean control_found;
control_found = gst_v4l2_decoder_query_control_size (decoder,
controls[i].id, &ret_size);
if (!controls[i].optional && !control_found) {
GST_WARNING ("Driver is missing %s support.", controls[i].name);
return FALSE;
}
if (control_found && ret_size != controls[i].size) {
GST_WARNING ("%s control size mismatch: got %d bytes but %d expected.",
controls[i].name, ret_size, controls[i].size);
return FALSE;
}
}
return TRUE;
}
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_STATELESS_H264_DECODE_MODE,
},
{
.id = V4L2_CID_STATELESS_H264_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;
}
self->decode_mode = control[0].value;
self->start_code = control[1].value;
GST_INFO_OBJECT (self, "Opened H264 %s decoder %s",
is_frame_based (self) ? "frame based" : "slice based",
needs_start_codes (self) ? "using start-codes" : "without 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 gint
get_pixel_bitdepth (GstV4l2CodecH264Dec * self)
{
gint depth;
switch (self->chroma_format_idc) {
case 0:
/* 4:0:0 */
depth = self->bitdepth;
break;
case 1:
/* 4:2:0 */
depth = self->bitdepth + self->bitdepth / 2;
break;
case 2:
/* 4:2:2 */
depth = 2 * self->bitdepth;
break;
case 3:
/* 4:4:4 */
depth = 3 * self->bitdepth;
break;
default:
GST_WARNING_OBJECT (self, "Unsupported chroma format %i",
self->chroma_format_idc);
depth = 0;
break;
}
return depth;
}
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_STATELESS_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_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 (!gst_v4l2_decoder_set_sink_fmt (self->decoder, V4L2_PIX_FMT_H264_SLICE,
self->coded_width, self->coded_height, get_pixel_bitdepth (self))) {
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);
if (self->interlaced)
self->output_state->info.interlace_mode = GST_VIDEO_INTERLACE_MODE_MIXED;
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, num_bitstream;
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);
num_bitstream = 1 +
MAX (1, gst_v4l2_decoder_get_render_delay (self->decoder));
self->sink_allocator = gst_v4l2_codec_allocator_new (self->decoder,
GST_PAD_SINK, num_bitstream);
if (!self->sink_allocator) {
GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT,
("Not enough memory to allocate sink buffers."), (NULL));
return FALSE;
}
self->src_allocator = gst_v4l2_codec_allocator_new (self->decoder,
GST_PAD_SRC, self->min_pool_size + min + 4);
if (!self->src_allocator) {
GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT,
("Not enough memory to allocate source buffers."), (NULL));
g_clear_object (&self->sink_allocator);
return FALSE;
}
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)
| (self->scaling_matrix_present ? V4L2_H264_PPS_FLAG_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, entry_id = 0;
/* *INDENT-OFF* */
self->decode_params = (struct v4l2_ctrl_h264_decode_params) {
.nal_ref_idc = picture->nal_ref_idc,
.frame_num = slice_hdr->frame_num,
.idr_pic_id = slice_hdr->idr_pic_id,
.pic_order_cnt_lsb = slice_hdr->pic_order_cnt_lsb,
.delta_pic_order_cnt_bottom = slice_hdr->delta_pic_order_cnt_bottom,
.delta_pic_order_cnt0 = slice_hdr->delta_pic_order_cnt[0],
.delta_pic_order_cnt1 = slice_hdr->delta_pic_order_cnt[1],
.dec_ref_pic_marking_bit_size = slice_hdr->dec_ref_pic_marking.bit_size,
.pic_order_cnt_bit_size = slice_hdr->pic_order_cnt_bit_size,
.slice_group_change_cycle = slice_hdr->slice_group_change_cycle,
.flags = (picture->idr ? V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC : 0) |
(slice_hdr->field_pic_flag ? V4L2_H264_DECODE_PARAM_FLAG_FIELD_PIC : 0) |
(slice_hdr->bottom_field_flag ? V4L2_H264_DECODE_PARAM_FLAG_BOTTOM_FIELD : 0),
};
/* *INDENT-ON* */
switch (picture->field) {
case GST_H264_PICTURE_FIELD_FRAME:
self->decode_params.top_field_order_cnt = picture->top_field_order_cnt;
self->decode_params.bottom_field_order_cnt =
picture->bottom_field_order_cnt;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
self->decode_params.top_field_order_cnt = picture->top_field_order_cnt;
self->decode_params.bottom_field_order_cnt = 0;
if (picture->other_field)
self->decode_params.bottom_field_order_cnt =
picture->other_field->bottom_field_order_cnt;
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
self->decode_params.top_field_order_cnt = 0;
if (picture->other_field)
self->decode_params.top_field_order_cnt =
picture->other_field->top_field_order_cnt;
self->decode_params.bottom_field_order_cnt =
picture->bottom_field_order_cnt;
break;
}
for (i = 0; i < refs->len; i++) {
GstH264Picture *ref_pic = g_array_index (refs, GstH264Picture *, i);
gint pic_num = ref_pic->pic_num;
gint frame_num = ref_pic->frame_num;
struct v4l2_h264_dpb_entry *entry;
/* Skip non-reference as they are not useful to decoding */
if (!GST_H264_PICTURE_IS_REF (ref_pic))
continue;
/* The second field picture will be handled differently */
if (ref_pic->second_field)
continue;
/* V4L2 uAPI uses pic_num for both PicNum and LongTermPicNum, and
* frame_num for both FrameNum and LongTermFrameIdx */
if (GST_H264_PICTURE_IS_LONG_TERM_REF (ref_pic)) {
pic_num = ref_pic->long_term_pic_num;
frame_num = ref_pic->long_term_frame_idx;
}
entry = &self->decode_params.dpb[entry_id++];
/* *INDENT-OFF* */
*entry = (struct v4l2_h264_dpb_entry) {
/*
* The reference is multiplied by 1000 because it's was set as micro
* seconds and this TS is nanosecond.
*/
.reference_ts = (guint64) ref_pic->system_frame_number * 1000,
.frame_num = frame_num,
.pic_num = pic_num,
.flags = V4L2_H264_DPB_ENTRY_FLAG_VALID
| (GST_H264_PICTURE_IS_REF (ref_pic) ? V4L2_H264_DPB_ENTRY_FLAG_ACTIVE : 0)
| (GST_H264_PICTURE_IS_LONG_TERM_REF (ref_pic) ? V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM : 0)
| (ref_pic->field_pic_flag ? V4L2_H264_DPB_ENTRY_FLAG_FIELD : 0),
};
/* *INDENT-ON* */
switch (ref_pic->field) {
case GST_H264_PICTURE_FIELD_FRAME:
entry->top_field_order_cnt = ref_pic->top_field_order_cnt;
entry->bottom_field_order_cnt = ref_pic->bottom_field_order_cnt;
entry->fields = V4L2_H264_FRAME_REF;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
entry->top_field_order_cnt = ref_pic->top_field_order_cnt;
entry->fields = V4L2_H264_TOP_FIELD_REF;
if (ref_pic->other_field) {
entry->bottom_field_order_cnt =
ref_pic->other_field->bottom_field_order_cnt;
entry->fields |= V4L2_H264_BOTTOM_FIELD_REF;
}
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
entry->bottom_field_order_cnt = ref_pic->bottom_field_order_cnt;
entry->fields = V4L2_H264_BOTTOM_FIELD_REF;
if (ref_pic->other_field) {
entry->top_field_order_cnt =
ref_pic->other_field->top_field_order_cnt;
entry->fields |= V4L2_H264_TOP_FIELD_REF;
}
break;
}
}
g_array_unref (refs);
}
static void
gst_v4l2_codec_h264_dec_fill_pred_weight (GstV4l2CodecH264Dec * self,
GstH264SliceHdr * slice_hdr)
{
gint i, j;
/* *INDENT-OFF* */
self->pred_weight = (struct v4l2_ctrl_h264_pred_weights) {
.luma_log2_weight_denom = slice_hdr->pred_weight_table.luma_log2_weight_denom,
.chroma_log2_weight_denom = slice_hdr->pred_weight_table.chroma_log2_weight_denom,
};
/* *INDENT-ON* */
for (i = 0; i <= slice_hdr->num_ref_idx_l0_active_minus1; i++) {
self->pred_weight.weight_factors[0].luma_weight[i] =
slice_hdr->pred_weight_table.luma_weight_l0[i];
self->pred_weight.weight_factors[0].luma_offset[i] =
slice_hdr->pred_weight_table.luma_offset_l0[i];
}
if (slice_hdr->pps->sequence->chroma_array_type != 0) {
for (i = 0; i <= slice_hdr->num_ref_idx_l0_active_minus1; i++) {
for (j = 0; j < 2; j++) {
self->pred_weight.weight_factors[0].chroma_weight[i][j] =
slice_hdr->pred_weight_table.chroma_weight_l0[i][j];
self->pred_weight.weight_factors[0].chroma_offset[i][j] =
slice_hdr->pred_weight_table.chroma_offset_l0[i][j];
}
}
}
/* Skip l1 if this is not a B-Frames. */
if (slice_hdr->type % 5 != GST_H264_B_SLICE)
return;
for (i = 0; i <= slice_hdr->num_ref_idx_l1_active_minus1; i++) {
self->pred_weight.weight_factors[1].luma_weight[i] =
slice_hdr->pred_weight_table.luma_weight_l1[i];
self->pred_weight.weight_factors[1].luma_offset[i] =
slice_hdr->pred_weight_table.luma_offset_l1[i];
}
if (slice_hdr->pps->sequence->chroma_array_type != 0) {
for (i = 0; i <= slice_hdr->num_ref_idx_l1_active_minus1; i++) {
for (j = 0; j < 2; j++) {
self->pred_weight.weight_factors[1].chroma_weight[i][j] =
slice_hdr->pred_weight_table.chroma_weight_l1[i][j];
self->pred_weight.weight_factors[1].chroma_offset[i][j] =
slice_hdr->pred_weight_table.chroma_offset_l1[i][j];
}
}
}
}
static guint
get_slice_header_bit_size (GstH264Slice * slice)
{
return 8 * slice->nalu.header_bytes + slice->header.header_size
- 8 * slice->header.n_emulation_prevention_bytes;
}
static void
gst_v4l2_codec_h264_dec_fill_slice_params (GstV4l2CodecH264Dec * self,
GstH264Slice * slice)
{
gint n = self->num_slices++;
gsize slice_size = slice->nalu.size;
struct v4l2_ctrl_h264_slice_params *params;
/* Ensure array is large enough */
if (self->slice_params->len < self->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) {
.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,
.colour_plane_id = slice->header.colour_plane_id,
.redundant_pic_cnt = slice->header.redundant_pic_cnt,
.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,
.flags = (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* */
}
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;
/* DPB entries only stores first field in a merged fashion */
if (ref_pic->second_field && ref_pic->other_field)
ref_pic = ref_pic->other_field;
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 guint
_get_v4l2_fields_ref (GstH264Picture * ref_pic, gboolean merge)
{
if (merge && ref_pic->other_field)
return V4L2_H264_FRAME_REF;
switch (ref_pic->field) {
case GST_H264_PICTURE_FIELD_FRAME:
return V4L2_H264_FRAME_REF;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
return V4L2_H264_TOP_FIELD_REF;
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
return V4L2_H264_BOTTOM_FIELD_REF;
break;
}
return V4L2_H264_FRAME_REF;
}
static void
gst_v4l2_codec_h264_dec_fill_references (GstV4l2CodecH264Dec * self,
gboolean cur_is_frame, 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].index =
lookup_dpb_index (self->decode_params.dpb, ref_pic);
slice_params->ref_pic_list0[i].fields =
_get_v4l2_fields_ref (ref_pic, cur_is_frame);
}
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].index =
lookup_dpb_index (self->decode_params.dpb, ref_pic);
slice_params->ref_pic_list1[i].fields =
_get_v4l2_fields_ref (ref_pic, cur_is_frame);
}
}
static GstFlowReturn
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;
gboolean interlaced;
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);
}
interlaced = !sps->frame_mbs_only_flag;
if (self->interlaced != interlaced) {
self->interlaced = interlaced;
negotiation_needed = TRUE;
GST_INFO_OBJECT (self, "Interlaced mode changed to %d", interlaced);
}
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);
self->need_sequence = TRUE;
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 GST_FLOW_NOT_NEGOTIATED;
}
}
/* 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 GST_FLOW_OK;
}
static gboolean
gst_v4l2_codec_h264_dec_ensure_bitstream (GstV4l2CodecH264Dec * self)
{
if (self->bitstream)
goto done;
self->bitstream = gst_v4l2_codec_allocator_alloc (self->sink_allocator);
if (!self->bitstream) {
GST_ELEMENT_ERROR (self, 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 (self, RESOURCE, WRITE,
("Could not access bitstream memory for writing"), (NULL));
g_clear_pointer (&self->bitstream, gst_memory_unref);
return FALSE;
}
done:
/* We use this field to track how much we have written */
self->bitstream_map.size = 0;
return TRUE;
}
static GstFlowReturn
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 GST_FLOW_NOT_NEGOTIATED;
if (!gst_v4l2_codec_h264_dec_ensure_bitstream (self))
return GST_FLOW_ERROR;
/*
* Scaling matrix is present if there's one provided
* by either the SPS or the PPS. This flag must be
* set to true or false, before filling the PPS V4L2 control.
*/
self->scaling_matrix_present =
slice->header.pps->sequence->scaling_matrix_present_flag ||
slice->header.pps->pic_scaling_matrix_present_flag;
gst_v4l2_codec_h264_dec_fill_pps (self, slice->header.pps);
if (self->scaling_matrix_present)
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);
self->first_slice = TRUE;
return GST_FLOW_OK;
}
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,
GstVideoCodecFrame * frame, GstH264Picture * picture)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
GstVideoDecoder *vdec = GST_VIDEO_DECODER (decoder);
GstV4l2Request *request = gst_h264_picture_get_user_data (picture);
gint ret;
GST_DEBUG_OBJECT (self, "Output picture %u", picture->system_frame_number);
ret = gst_v4l2_request_set_done (request);
if (ret == 0) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Decoding frame %u took too long", picture->system_frame_number),
(NULL));
goto error;
} else if (ret < 0) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Decoding request failed: %s", g_strerror (errno)), (NULL));
goto error;
}
g_return_val_if_fail (frame->output_buffer, GST_FLOW_ERROR);
if (gst_v4l2_request_failed (request)) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Failed to decode frame %u", picture->system_frame_number), (NULL));
goto 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);
gst_h264_picture_unref (picture);
return gst_video_decoder_finish_frame (vdec, frame);
error:
gst_video_decoder_drop_frame (vdec, frame);
gst_h264_picture_unref (picture);
return GST_FLOW_ERROR;
}
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->num_slices = 0;
}
static gboolean
gst_v4l2_codec_h264_dec_ensure_output_buffer (GstV4l2CodecH264Dec * self,
GstVideoCodecFrame * frame)
{
GstBuffer *buffer;
GstFlowReturn flow_ret;
if (frame->output_buffer)
return TRUE;
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));
return FALSE;
}
frame->output_buffer = buffer;
return TRUE;
}
static gboolean
gst_v4l2_codec_h264_dec_submit_bitstream (GstV4l2CodecH264Dec * self,
GstH264Picture * picture, guint flags)
{
GstV4l2Request *prev_request, *request = NULL;
gsize bytesused;
gboolean ret = FALSE;
guint count = 0;
/* *INDENT-OFF* */
/* Reserve space for controls */
struct v4l2_ext_control control[] = {
{ }, /* SPS */
{ }, /* PPS */
{ }, /* DECODE_PARAMS */
{ }, /* SLICE_PARAMS */
{ }, /* SCALING_MATRIX */
{ }, /* PRED_WEIGHTS */
};
/* *INDENT-ON* */
prev_request = gst_h264_picture_get_user_data (picture);
bytesused = self->bitstream_map.size;
gst_memory_unmap (self->bitstream, &self->bitstream_map);
self->bitstream_map = (GstMapInfo) GST_MAP_INFO_INIT;
gst_memory_resize (self->bitstream, 0, bytesused);
if (prev_request) {
request = gst_v4l2_decoder_alloc_sub_request (self->decoder, prev_request,
self->bitstream);
} else {
GstVideoCodecFrame *frame;
frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self),
picture->system_frame_number);
g_return_val_if_fail (frame, FALSE);
if (!gst_v4l2_codec_h264_dec_ensure_output_buffer (self, frame))
goto done;
request = gst_v4l2_decoder_alloc_request (self->decoder,
picture->system_frame_number, self->bitstream, frame->output_buffer);
gst_video_codec_frame_unref (frame);
}
if (!request) {
GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT,
("Failed to allocate a media request object."), (NULL));
goto done;
}
if (self->need_sequence) {
control[count].id = V4L2_CID_STATELESS_H264_SPS;
control[count].ptr = &self->sps;
control[count].size = sizeof (self->sps);
count++;
self->need_sequence = FALSE;
}
if (self->first_slice) {
control[count].id = V4L2_CID_STATELESS_H264_PPS;
control[count].ptr = &self->pps;
control[count].size = sizeof (self->pps);
count++;
if (self->scaling_matrix_present) {
control[count].id = V4L2_CID_STATELESS_H264_SCALING_MATRIX;
control[count].ptr = &self->scaling_matrix;
control[count].size = sizeof (self->scaling_matrix);
count++;
}
control[count].id = V4L2_CID_STATELESS_H264_DECODE_PARAMS;
control[count].ptr = &self->decode_params;
control[count].size = sizeof (self->decode_params);
count++;
self->first_slice = FALSE;
}
/* If it's not slice-based then it doesn't support per-slice controls. */
if (is_slice_based (self)) {
control[count].id = V4L2_CID_STATELESS_H264_SLICE_PARAMS;
control[count].ptr = self->slice_params->data;
control[count].size = g_array_get_element_size (self->slice_params)
* self->num_slices;
count++;
control[count].id = V4L2_CID_STATELESS_H264_PRED_WEIGHTS;
control[count].ptr = &self->pred_weight;
control[count].size = sizeof (self->pred_weight);
count++;
}
if (!gst_v4l2_decoder_set_controls (self->decoder, request, control, count)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the bitstream parameters."), (NULL));
goto done;
}
if (!gst_v4l2_request_queue (request, flags)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the decode request."), (NULL));
goto done;
}
gst_h264_picture_set_user_data (picture, g_steal_pointer (&request),
(GDestroyNotify) gst_v4l2_request_unref);
ret = TRUE;
done:
if (request)
gst_v4l2_request_unref (request);
gst_v4l2_codec_h264_dec_reset_picture (self);
return ret;
}
static GstFlowReturn
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;
if (is_slice_based (self)) {
if (self->bitstream_map.size) {
/* In slice mode, we submit the pending slice asking the accelerator to
* hold on the picture */
if (!gst_v4l2_codec_h264_dec_submit_bitstream (self, picture,
V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF)
|| !gst_v4l2_codec_h264_dec_ensure_bitstream (self))
return GST_FLOW_ERROR;
}
gst_v4l2_codec_h264_dec_fill_slice_params (self, slice);
gst_v4l2_codec_h264_dec_fill_pred_weight (self, &slice->header);
gst_v4l2_codec_h264_dec_fill_references (self,
GST_H264_PICTURE_IS_FRAME (picture), ref_pic_list0, ref_pic_list1);
}
bitstream_data = self->bitstream_map.data + self->bitstream_map.size;
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 GST_FLOW_ERROR;
}
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;
switch (slice->header.type % 5) {
case GST_H264_P_SLICE:
self->decode_params.flags |= V4L2_H264_DECODE_PARAM_FLAG_PFRAME;
break;
case GST_H264_B_SLICE:
self->decode_params.flags |= V4L2_H264_DECODE_PARAM_FLAG_BFRAME;
break;
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_v4l2_codec_h264_dec_end_picture (GstH264Decoder * decoder,
GstH264Picture * picture)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
guint flags = 0;
/* Hold on the output frame if this is first field of a pair */
if (picture->field != GST_H264_PICTURE_FIELD_FRAME && !picture->second_field)
flags = V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
if (!gst_v4l2_codec_h264_dec_submit_bitstream (self, picture, flags))
return GST_FLOW_ERROR;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_v4l2_codec_h264_dec_new_field_picture (GstH264Decoder * decoder,
GstH264Picture * first_field, GstH264Picture * second_field)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
GstV4l2Request *request = gst_h264_picture_get_user_data (first_field);
if (!request) {
GST_WARNING_OBJECT (self,
"First picture does not have an associated request");
return GST_FLOW_OK;
}
GST_DEBUG_OBJECT (self, "Assigned request %i to second field.",
gst_v4l2_request_get_fd (request));
/* Associate the previous request with the new picture so that
* submit_bitstream can create sub-request */
gst_h264_picture_set_user_data (second_field, gst_v4l2_request_ref (request),
(GDestroyNotify) gst_v4l2_request_unref);
return GST_FLOW_OK;
}
static guint
gst_v4l2_codec_h264_dec_get_preferred_output_delay (GstH264Decoder * decoder,
gboolean live)
{
GstV4l2CodecH264Dec *self = GST_V4L2_CODEC_H264_DEC (decoder);
guint delay;
if (live)
delay = 0;
else
/* Just one for now, perhaps we can make this configurable in the future. */
delay = 1;
gst_v4l2_decoder_set_render_delay (self->decoder, delay);
return delay;
}
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);
h264decoder_class->new_field_picture =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_new_field_picture);
h264decoder_class->get_preferred_output_delay =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_h264_dec_get_preferred_output_delay);
klass->device = device;
gst_v4l2_decoder_install_properties (gobject_class, PROP_LAST, device);
}
void
gst_v4l2_codec_h264_dec_register (GstPlugin * plugin, GstV4l2Decoder * decoder,
GstV4l2CodecDevice * device, guint rank)
{
GstCaps *src_caps;
guint version;
GST_DEBUG_CATEGORY_INIT (v4l2_h264dec_debug, "v4l2codecs-h264dec", 0,
"V4L2 stateless h264 decoder");
if (!gst_v4l2_decoder_set_sink_fmt (decoder, V4L2_PIX_FMT_H264_SLICE,
320, 240, 8))
return;
src_caps = gst_v4l2_decoder_enum_src_formats (decoder);
if (gst_caps_is_empty (src_caps)) {
GST_WARNING ("Not registering H264 decoder since it produces no "
"supported format");
goto done;
}
version = gst_v4l2_decoder_get_version (decoder);
if (version < V4L2_MIN_KERNEL_VERSION)
GST_WARNING ("V4L2 API v%u.%u too old, at least v%u.%u required",
(version >> 16) & 0xff, (version >> 8) & 0xff,
V4L2_MIN_KERNEL_VER_MAJOR, V4L2_MIN_KERNEL_VER_MINOR);
if (!gst_v4l2_decoder_h264_api_check (decoder)) {
GST_WARNING ("Not registering H264 decoder as it failed ABI check.");
goto done;
}
gst_v4l2_decoder_register (plugin,
GST_TYPE_V4L2_CODEC_H264_DEC,
(GClassInitFunc) gst_v4l2_codec_h264_dec_subclass_init,
gst_mini_object_ref (GST_MINI_OBJECT (device)),
(GInstanceInitFunc) gst_v4l2_codec_h264_dec_subinit,
"v4l2sl%sh264dec", device, rank, NULL);
done:
gst_caps_unref (src_caps);
}
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