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gstreamer/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codech264dec.c
Nicolas Dufresne 316b182a86 v4l2codecs: h264: Reset the number of slices on picture start 
This way, if we aborted a frame in the middle, we don't endup thinking
there is multiple slices to send.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1079>
2022-07-22 10:21:03 -04:00

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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;
self->num_slices = 0;
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 num_controls = 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[num_controls].id = V4L2_CID_STATELESS_H264_SPS;
control[num_controls].ptr = &self->sps;
control[num_controls].size = sizeof (self->sps);
num_controls++;
self->need_sequence = FALSE;
}
if (self->first_slice) {
control[num_controls].id = V4L2_CID_STATELESS_H264_PPS;
control[num_controls].ptr = &self->pps;
control[num_controls].size = sizeof (self->pps);
num_controls++;
if (self->scaling_matrix_present) {
control[num_controls].id = V4L2_CID_STATELESS_H264_SCALING_MATRIX;
control[num_controls].ptr = &self->scaling_matrix;
control[num_controls].size = sizeof (self->scaling_matrix);
num_controls++;
}
control[num_controls].id = V4L2_CID_STATELESS_H264_DECODE_PARAMS;
control[num_controls].ptr = &self->decode_params;
control[num_controls].size = sizeof (self->decode_params);
num_controls++;
self->first_slice = FALSE;
}
/* If it's not slice-based then it doesn't support per-slice controls. */
if (is_slice_based (self)) {
control[num_controls].id = V4L2_CID_STATELESS_H264_SLICE_PARAMS;
control[num_controls].ptr = self->slice_params->data;
control[num_controls].size = g_array_get_element_size (self->slice_params)
* self->num_slices;
num_controls++;
control[num_controls].id = V4L2_CID_STATELESS_H264_PRED_WEIGHTS;
control[num_controls].ptr = &self->pred_weight;
control[num_controls].size = sizeof (self->pred_weight);
num_controls++;
}
if (num_controls > G_N_ELEMENTS (control))
g_error ("Set too many controls, increase control[] size");
if (!gst_v4l2_decoder_set_controls (self->decoder, request, control,
num_controls)) {
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);
g_array_set_size (self->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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