mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-19 00:01:23 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/sys/vdpau/h264/gstvdph264dec.c
Tim-Philipp Müller 9e1b75fda3 Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-04 00:09:59 +00:00

904 lines
26 KiB
C
Raw Blame History

/* GStreamer
*
* Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.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 <gst/base/gstadapter.h>
#include <gst/base/gstbitreader.h>
#include <string.h>
#include "gsth264frame.h"
#include "gstvdph264dec.h"
GST_DEBUG_CATEGORY_STATIC (gst_vdp_h264_dec_debug);
#define GST_CAT_DEFAULT gst_vdp_h264_dec_debug
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE (GST_BASE_VIDEO_DECODER_SINK_NAME,
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264, " "interlaced = (boolean) false")
);
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_vdp_h264_dec_debug, "vdpauh264dec", 0, \
"VDPAU h264 decoder");
GST_BOILERPLATE_FULL (GstVdpH264Dec, gst_vdp_h264_dec, GstVdpDecoder,
GST_TYPE_VDP_DECODER, DEBUG_INIT);
#define SYNC_CODE_SIZE 3
#define READ_UINT8(reader, val, nbits) { \
if (!gst_bit_reader_get_bits_uint8 (reader, &val, nbits)) { \
GST_WARNING ("failed to read uint8, nbits: %d", nbits); \
return FALSE; \
} \
}
#define READ_UINT16(reader, val, nbits) { \
if (!gst_bit_reader_get_bits_uint16 (reader, &val, nbits)) { \
GST_WARNING ("failed to read uint16, nbits: %d", nbits); \
return FALSE; \
} \
}
#define SKIP(reader, nbits) { \
if (!gst_bit_reader_skip (reader, nbits)) { \
GST_WARNING ("failed to skip nbits: %d", nbits); \
return FALSE; \
} \
}
static gboolean
gst_vdp_h264_dec_set_sink_caps (GstBaseVideoDecoder * base_video_decoder,
GstCaps * caps)
{
GstVdpH264Dec *h264_dec;
GstStructure *structure;
const GValue *value;
h264_dec = GST_VDP_H264_DEC (base_video_decoder);
structure = gst_caps_get_structure (caps, 0);
/* packetized video has a codec_data */
if ((value = gst_structure_get_value (structure, "codec_data"))) {
GstBuffer *buf;
GstBitReader reader;
guint8 version;
guint8 n_sps, n_pps;
gint i;
GST_DEBUG_OBJECT (h264_dec, "have packetized h264");
h264_dec->packetized = TRUE;
buf = gst_value_get_buffer (value);
GST_MEMDUMP ("avcC:", GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
/* parse the avcC data */
if (GST_BUFFER_SIZE (buf) < 7) {
GST_ERROR_OBJECT (h264_dec, "avcC size %u < 7", GST_BUFFER_SIZE (buf));
return FALSE;
}
gst_bit_reader_init_from_buffer (&reader, buf);
READ_UINT8 (&reader, version, 8);
if (version != 1)
return FALSE;
SKIP (&reader, 30);
READ_UINT8 (&reader, h264_dec->nal_length_size, 2);
h264_dec->nal_length_size += 1;
GST_DEBUG_OBJECT (h264_dec, "nal length %u", h264_dec->nal_length_size);
SKIP (&reader, 3);
READ_UINT8 (&reader, n_sps, 5);
for (i = 0; i < n_sps; i++) {
guint16 sps_length;
guint8 *data;
READ_UINT16 (&reader, sps_length, 16);
sps_length -= 1;
SKIP (&reader, 8);
data = GST_BUFFER_DATA (buf) + gst_bit_reader_get_pos (&reader) / 8;
if (!gst_h264_parser_parse_sequence (h264_dec->parser, data, sps_length))
return FALSE;
SKIP (&reader, sps_length * 8);
}
READ_UINT8 (&reader, n_pps, 8);
for (i = 0; i < n_pps; i++) {
guint16 pps_length;
guint8 *data;
READ_UINT16 (&reader, pps_length, 16);
pps_length -= 1;
SKIP (&reader, 8);
data = GST_BUFFER_DATA (buf) + gst_bit_reader_get_pos (&reader) / 8;
if (!gst_h264_parser_parse_picture (h264_dec->parser, data, pps_length))
return FALSE;
SKIP (&reader, pps_length * 8);
}
}
return TRUE;
}
static GstFlowReturn
gst_vdp_h264_dec_output (GstH264DPB * dpb, GstH264Frame * h264_frame,
gpointer user_data)
{
GstBaseVideoDecoder *base_video_decoder = (GstBaseVideoDecoder *) user_data;
GST_DEBUG ("poc: %d", h264_frame->poc);
return gst_base_video_decoder_finish_frame (base_video_decoder,
GST_VIDEO_FRAME_CAST (h264_frame));
}
static guint
gst_vdp_h264_dec_calculate_poc (GstVdpH264Dec * h264_dec, GstH264Slice * slice)
{
GstH264Picture *pic;
GstH264Sequence *seq;
guint poc = 0;
pic = slice->picture;
seq = pic->sequence;
if (seq->pic_order_cnt_type == 0) {
guint32 max_poc_cnt_lsb = 1 << (seq->log2_max_pic_order_cnt_lsb_minus4 + 4);
if ((slice->pic_order_cnt_lsb < h264_dec->prev_poc_lsb) &&
((h264_dec->prev_poc_lsb - slice->pic_order_cnt_lsb) >=
(max_poc_cnt_lsb / 2)))
h264_dec->poc_msb = h264_dec->poc_msb + max_poc_cnt_lsb;
else if ((slice->pic_order_cnt_lsb > h264_dec->prev_poc_lsb) &&
((slice->pic_order_cnt_lsb - h264_dec->prev_poc_lsb) >
(max_poc_cnt_lsb / 2)))
h264_dec->poc_msb = h264_dec->poc_msb - max_poc_cnt_lsb;
poc = h264_dec->poc_msb + slice->pic_order_cnt_lsb;
h264_dec->prev_poc_lsb = slice->pic_order_cnt_lsb;
}
return poc;
}
static void
gst_vdp_h264_dec_init_frame_info (GstVdpH264Dec * h264_dec,
GstH264Frame * h264_frame)
{
GstH264Slice *slice;
slice = &h264_frame->slice_hdr;
h264_frame->poc = gst_vdp_h264_dec_calculate_poc (h264_dec, slice);
h264_frame->output_needed = TRUE;
h264_frame->is_long_term = FALSE;
h264_frame->frame_idx = slice->frame_num;
/* is reference */
if (slice->nal_unit.ref_idc == 0)
h264_frame->is_reference = FALSE;
else if (slice->nal_unit.IdrPicFlag) {
h264_frame->is_reference = TRUE;
if (slice->dec_ref_pic_marking.long_term_reference_flag) {
h264_frame->is_long_term = TRUE;
h264_frame->frame_idx = 0;
}
} else {
h264_frame->is_reference = TRUE;
if (slice->dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag) {
GstH264RefPicMarking *marking;
guint i;
marking = slice->dec_ref_pic_marking.ref_pic_marking;
for (i = 0; i < slice->dec_ref_pic_marking.n_ref_pic_marking; i++) {
if (marking[i].memory_management_control_operation == 6) {
h264_frame->is_long_term = TRUE;
h264_frame->frame_idx = marking[i].long_term_frame_idx;
break;
}
}
}
}
}
static gboolean
gst_vdp_h264_dec_calculate_par (GstH264VUIParameters * vui, guint16 * par_n,
guint16 * par_d)
{
guint16 aspect[16][2] = { {1, 1}, {12, 11}, {10, 11}, {16, 11}, {40, 33},
{24, 11}, {20, 11}, {32, 11}, {80, 33}, {18, 11}, {15, 11}, {64, 33},
{160, 99}, {4, 3}, {3, 2}, {2, 1}
};
if (vui->aspect_ratio_idc >= 1 && vui->aspect_ratio_idc <= 16) {
*par_n = aspect[vui->aspect_ratio_idc - 1][0];
*par_d = aspect[vui->aspect_ratio_idc - 1][1];
return TRUE;
} else if (vui->aspect_ratio_idc == 255) {
*par_n = vui->sar_height;
*par_d = vui->sar_width;
return TRUE;
}
return FALSE;
}
static GstFlowReturn
gst_vdp_h264_dec_idr (GstVdpH264Dec * h264_dec, GstH264Frame * h264_frame)
{
GstH264Slice *slice;
GstH264Sequence *seq;
h264_dec->poc_msb = 0;
h264_dec->prev_poc_lsb = 0;
slice = &h264_frame->slice_hdr;
if (slice->dec_ref_pic_marking.no_output_of_prior_pics_flag)
gst_h264_dpb_flush (h264_dec->dpb, FALSE);
else
gst_h264_dpb_flush (h264_dec->dpb, TRUE);
if (slice->dec_ref_pic_marking.long_term_reference_flag)
g_object_set (h264_dec->dpb, "max-longterm-frame-idx", 0, NULL);
else
g_object_set (h264_dec->dpb, "max-longterm-frame-idx", -1, NULL);
seq = slice->picture->sequence;
if (seq != h264_dec->sequence) {
GstVideoState state;
VdpDecoderProfile profile;
GstFlowReturn ret;
state =
gst_base_video_decoder_get_state (GST_BASE_VIDEO_DECODER (h264_dec));
state.width = (seq->pic_width_in_mbs_minus1 + 1) * 16 -
2 * seq->frame_crop_right_offset;
state.height = (2 - seq->frame_mbs_only_flag) *
(seq->pic_height_in_map_units_minus1 + 1) * 16;
if (seq->frame_mbs_only_flag)
state.height -= 2 * seq->frame_crop_bottom_offset;
else
state.height -= 4 * seq->frame_crop_bottom_offset;
/* calculate framerate if we haven't got one */
if (state.fps_n == 0 && seq->vui_parameters_present_flag) {
GstH264VUIParameters *vui;
guint16 par_n, par_d;
vui = &seq->vui_parameters;
if (gst_vdp_h264_dec_calculate_par (vui, &par_n, &par_d)) {
state.par_n = par_n;
state.par_d = par_d;
}
if (vui->timing_info_present_flag && vui->fixed_frame_rate_flag) {
state.fps_n = vui->time_scale;
state.fps_d = vui->num_units_in_tick;
if (seq->frame_mbs_only_flag)
state.fps_d *= 2;
}
}
gst_base_video_decoder_set_state (GST_BASE_VIDEO_DECODER (h264_dec), state);
switch (seq->profile_idc) {
case 66:
profile = VDP_DECODER_PROFILE_H264_BASELINE;
break;
case 77:
profile = VDP_DECODER_PROFILE_H264_MAIN;
break;
case 100:
profile = VDP_DECODER_PROFILE_H264_HIGH;
break;
default:
GST_ELEMENT_ERROR (h264_dec, STREAM, WRONG_TYPE,
("vdpauh264dec doesn't support this streams profile"),
("profile_idc: %d", seq->profile_idc));
return GST_FLOW_ERROR;
}
ret = gst_vdp_decoder_init_decoder (GST_VDP_DECODER (h264_dec), profile,
seq->num_ref_frames);
if (ret != GST_FLOW_OK)
return ret;
g_object_set (h264_dec->dpb, "num-ref-frames", seq->num_ref_frames, NULL);
h264_dec->sequence = seq;
}
return GST_FLOW_OK;
}
static VdpPictureInfoH264
gst_vdp_h264_dec_fill_info (GstVdpH264Dec * h264_dec, GstH264Frame * h264_frame)
{
GstH264Slice *slice;
GstH264Picture *pic;
GstH264Sequence *seq;
VdpPictureInfoH264 info;
slice = &h264_frame->slice_hdr;
pic = slice->picture;
seq = pic->sequence;
info.slice_count = h264_frame->slices->len;
/* FIXME: we only handle frames for now */
info.field_order_cnt[0] = h264_frame->poc;
info.field_order_cnt[1] = h264_frame->poc;
info.is_reference = h264_frame->is_reference;
info.frame_num = slice->frame_num;
info.field_pic_flag = slice->field_pic_flag;
info.bottom_field_flag = slice->bottom_field_flag;
info.num_ref_idx_l0_active_minus1 = slice->num_ref_idx_l0_active_minus1;
info.num_ref_idx_l1_active_minus1 = slice->num_ref_idx_l1_active_minus1;
info.num_ref_frames = seq->num_ref_frames;
info.frame_mbs_only_flag = seq->frame_mbs_only_flag;
info.mb_adaptive_frame_field_flag = seq->mb_adaptive_frame_field_flag;
info.log2_max_frame_num_minus4 = seq->log2_max_frame_num_minus4;
info.pic_order_cnt_type = seq->pic_order_cnt_type;
info.log2_max_pic_order_cnt_lsb_minus4 =
seq->log2_max_pic_order_cnt_lsb_minus4;
info.delta_pic_order_always_zero_flag = seq->delta_pic_order_always_zero_flag;
info.direct_8x8_inference_flag = seq->direct_8x8_inference_flag;
info.constrained_intra_pred_flag = pic->constrained_intra_pred_flag;
info.weighted_pred_flag = pic->weighted_pred_flag;
info.weighted_bipred_idc = pic->weighted_bipred_idc;
info.transform_8x8_mode_flag = pic->transform_8x8_mode_flag;
info.chroma_qp_index_offset = pic->chroma_qp_index_offset;
info.second_chroma_qp_index_offset = pic->second_chroma_qp_index_offset;
info.pic_init_qp_minus26 = pic->pic_init_qp_minus26;
info.entropy_coding_mode_flag = pic->entropy_coding_mode_flag;
info.pic_order_present_flag = pic->pic_order_present_flag;
info.deblocking_filter_control_present_flag =
pic->deblocking_filter_control_present_flag;
info.redundant_pic_cnt_present_flag = pic->redundant_pic_cnt_present_flag;
memcpy (&info.scaling_lists_4x4, &pic->scaling_lists_4x4, 96);
memcpy (&info.scaling_lists_8x8, &pic->scaling_lists_8x8, 128);
gst_h264_dpb_fill_reference_frames (h264_dec->dpb, info.referenceFrames);
return info;
}
static VdpBitstreamBuffer *
gst_vdp_h264_dec_create_bitstream_buffers (GstVdpH264Dec * h264_dec,
GstH264Frame * h264_frame, guint * n_bufs)
{
VdpBitstreamBuffer *bufs;
if (h264_dec->packetized) {
guint i;
bufs = g_new (VdpBitstreamBuffer, h264_frame->slices->len * 2);
*n_bufs = h264_frame->slices->len * 2;
for (i = 0; i < h264_frame->slices->len; i++) {
static const guint8 start_code[] = { 0x00, 0x00, 0x01 };
guint idx;
GstBuffer *buf;
idx = i * 2;
bufs[idx].bitstream = start_code;
bufs[idx].bitstream_bytes = 3;
bufs[idx].struct_version = VDP_BITSTREAM_BUFFER_VERSION;
idx = idx + 1;
buf = GST_BUFFER_CAST (g_ptr_array_index (h264_frame->slices, i));
bufs[idx].bitstream = GST_BUFFER_DATA (buf) + h264_dec->nal_length_size;
bufs[idx].bitstream_bytes = GST_BUFFER_SIZE (buf) -
h264_dec->nal_length_size;
bufs[idx].struct_version = VDP_BITSTREAM_BUFFER_VERSION;
}
}
else {
guint i;
bufs = g_new (VdpBitstreamBuffer, h264_frame->slices->len);
*n_bufs = h264_frame->slices->len;
for (i = 0; i < h264_frame->slices->len; i++) {
GstBuffer *buf;
buf = GST_BUFFER_CAST (g_ptr_array_index (h264_frame->slices, i));
bufs[i].bitstream = GST_BUFFER_DATA (buf);
bufs[i].bitstream_bytes = GST_BUFFER_SIZE (buf);
bufs[i].struct_version = VDP_BITSTREAM_BUFFER_VERSION;
}
}
return bufs;
}
static GstFlowReturn
gst_vdp_h264_dec_handle_frame (GstBaseVideoDecoder * base_video_decoder,
GstVideoFrame * frame, GstClockTimeDiff deadline)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
GstH264Frame *h264_frame;
GstH264Slice *slice;
GstH264Picture *pic G_GNUC_UNUSED;
GstH264Sequence *seq G_GNUC_UNUSED;
GstFlowReturn ret;
GstVdpVideoBuffer *outbuf;
VdpPictureInfoH264 info;
VdpBitstreamBuffer *bufs;
guint n_bufs;
GST_DEBUG ("handle_frame");
h264_frame = GST_H264_FRAME_CAST (frame);
slice = &h264_frame->slice_hdr;
pic = slice->picture;
seq = pic->sequence;
if (slice->nal_unit.IdrPicFlag) {
ret = gst_vdp_h264_dec_idr (h264_dec, h264_frame);
if (ret == GST_FLOW_OK)
h264_dec->got_idr = TRUE;
else {
gst_base_video_decoder_skip_frame (base_video_decoder, frame);
return GST_FLOW_OK;
}
}
/* check if we've got a IDR frame yet */
if (!h264_dec->got_idr) {
gst_base_video_decoder_skip_frame (base_video_decoder, frame);
return GST_FLOW_OK;
}
gst_vdp_h264_dec_init_frame_info (h264_dec, h264_frame);
info = gst_vdp_h264_dec_fill_info (h264_dec, h264_frame);
bufs = gst_vdp_h264_dec_create_bitstream_buffers (h264_dec, h264_frame,
&n_bufs);
ret = gst_vdp_decoder_render (GST_VDP_DECODER (h264_dec),
(VdpPictureInfo *) & info, n_bufs, bufs, &outbuf);
g_free (bufs);
if (ret != GST_FLOW_OK) {
gst_base_video_decoder_skip_frame (base_video_decoder, frame);
return ret;
}
frame->src_buffer = GST_BUFFER_CAST (outbuf);
/* DPB handling */
if (slice->nal_unit.ref_idc != 0 && !slice->nal_unit.IdrPicFlag) {
if (slice->dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag) {
GstH264RefPicMarking *marking;
guint i;
marking = slice->dec_ref_pic_marking.ref_pic_marking;
for (i = 0; i < slice->dec_ref_pic_marking.n_ref_pic_marking; i++) {
switch (marking[i].memory_management_control_operation) {
case 1:
{
guint16 pic_num;
pic_num = slice->frame_num -
(marking[i].difference_of_pic_nums_minus1 + 1);
gst_h264_dpb_mark_short_term_unused (h264_dec->dpb, pic_num);
break;
}
case 2:
{
gst_h264_dpb_mark_long_term_unused (h264_dec->dpb,
marking[i].long_term_pic_num);
break;
}
case 3:
{
guint16 pic_num;
pic_num = slice->frame_num -
(marking[i].difference_of_pic_nums_minus1 + 1);
gst_h264_dpb_mark_long_term (h264_dec->dpb, pic_num,
marking[i].long_term_frame_idx);
break;
}
case 4:
{
g_object_set (h264_dec->dpb, "max-longterm-frame-idx",
marking[i].max_long_term_frame_idx_plus1 - 1, NULL);
break;
}
case 5:
{
gst_h264_dpb_mark_all_unused (h264_dec->dpb);
g_object_set (h264_dec->dpb, "max-longterm-frame-idx", -1, NULL);
break;
}
default:
break;
}
}
} else
gst_h264_dpb_mark_sliding (h264_dec->dpb);
}
return gst_h264_dpb_add (h264_dec->dpb, h264_frame);
}
static gint
gst_vdp_h264_dec_scan_for_sync (GstBaseVideoDecoder * base_video_decoder,
GstAdapter * adapter)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
gint m;
if (h264_dec->packetized)
return 0;
m = gst_adapter_masked_scan_uint32 (adapter, 0xffffff00, 0x00000100,
0, gst_adapter_available (adapter));
if (m == -1)
return gst_adapter_available (adapter) - SYNC_CODE_SIZE;
return m;
}
static GstBaseVideoDecoderScanResult
gst_vdp_h264_dec_scan_for_packet_end (GstBaseVideoDecoder * base_video_decoder,
GstAdapter * adapter, guint * size, gboolean at_eos)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
guint avail;
avail = gst_adapter_available (adapter);
if (avail < h264_dec->nal_length_size)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_NEED_DATA;
if (h264_dec->packetized) {
guint8 *data;
gint i;
guint32 nal_length = 0;
data = g_slice_alloc (h264_dec->nal_length_size);
gst_adapter_copy (adapter, data, 0, h264_dec->nal_length_size);
for (i = 0; i < h264_dec->nal_length_size; i++)
nal_length = (nal_length << 8) | data[i];
g_slice_free1 (h264_dec->nal_length_size, data);
nal_length += h264_dec->nal_length_size;
/* check for invalid NALU sizes, assume the size if the available bytes
* when something is fishy */
if (nal_length <= 1 || nal_length > avail) {
nal_length = avail - h264_dec->nal_length_size;
GST_DEBUG ("fixing invalid NALU size to %u", nal_length);
}
*size = nal_length;
}
else {
guint8 *data;
guint32 start_code;
guint n;
data = g_slice_alloc (SYNC_CODE_SIZE);
gst_adapter_copy (adapter, data, 0, SYNC_CODE_SIZE);
start_code = ((data[0] << 16) && (data[1] << 8) && data[2]);
g_slice_free1 (SYNC_CODE_SIZE, data);
GST_DEBUG ("start_code: %d", start_code);
if (start_code == 0x000001)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_LOST_SYNC;
n = gst_adapter_masked_scan_uint32 (adapter, 0xffffff00, 0x00000100,
SYNC_CODE_SIZE, avail - SYNC_CODE_SIZE);
if (n == -1)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_NEED_DATA;
*size = n;
}
GST_DEBUG ("NAL size: %d", *size);
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_OK;
}
static GstFlowReturn
gst_vdp_h264_dec_parse_data (GstBaseVideoDecoder * base_video_decoder,
GstBuffer * buf, gboolean at_eos, GstVideoFrame * frame)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
GstBitReader reader;
GstNalUnit nal_unit;
guint8 forbidden_zero_bit;
guint8 *data;
guint size;
gint i;
GstFlowReturn ret = GST_FLOW_OK;
GST_MEMDUMP ("data", GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
gst_bit_reader_init_from_buffer (&reader, buf);
if (gst_bit_reader_get_remaining (&reader) <
h264_dec->nal_length_size * 8 + 7)
goto invalid_packet;
/* skip nal_length or sync code */
gst_bit_reader_skip_unchecked (&reader, h264_dec->nal_length_size * 8);
forbidden_zero_bit = gst_bit_reader_get_bits_uint8_unchecked (&reader, 1);
if (forbidden_zero_bit != 0) {
GST_WARNING ("forbidden_zero_bit != 0");
return GST_FLOW_ERROR;
}
nal_unit.ref_idc = gst_bit_reader_get_bits_uint16_unchecked (&reader, 2);
GST_DEBUG ("nal_ref_idc: %u", nal_unit.ref_idc);
/* read nal_unit_type */
nal_unit.type = gst_bit_reader_get_bits_uint16_unchecked (&reader, 5);
GST_DEBUG ("nal_unit_type: %u", nal_unit.type);
if (nal_unit.type == 14 || nal_unit.type == 20) {
if (!gst_bit_reader_skip (&reader, 24))
goto invalid_packet;
}
nal_unit.IdrPicFlag = (nal_unit.type == 5 ? 1 : 0);
data = GST_BUFFER_DATA (buf) + gst_bit_reader_get_pos (&reader) / 8;
size = gst_bit_reader_get_remaining (&reader) / 8;
i = size - 1;
while ((gint) size > 0 && data[i] == 0x00) {
size--;
i--;
}
if (GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_H264_FRAME_GOT_PRIMARY)) {
if (nal_unit.type == GST_NAL_SPS || nal_unit.type == GST_NAL_PPS ||
nal_unit.type == GST_NAL_SEI || nal_unit.type == GST_NAL_AU_DELIMITER ||
(nal_unit.type >= 14 && nal_unit.type <= 18))
ret =
gst_base_video_decoder_have_frame (base_video_decoder, FALSE, &frame);
}
if (nal_unit.type >= GST_NAL_SLICE && nal_unit.type <= GST_NAL_SLICE_IDR) {
GstH264Slice slice;
if (!gst_h264_parser_parse_slice_header (h264_dec->parser, &slice, data,
size, nal_unit))
goto invalid_packet;
if (slice.redundant_pic_cnt == 0) {
if (GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_H264_FRAME_GOT_PRIMARY)) {
GstH264Slice *p_slice;
guint8 pic_order_cnt_type, p_pic_order_cnt_type;
gboolean finish_frame = FALSE;
p_slice = &(GST_H264_FRAME_CAST (frame)->slice_hdr);
pic_order_cnt_type = slice.picture->sequence->pic_order_cnt_type;
p_pic_order_cnt_type = p_slice->picture->sequence->pic_order_cnt_type;
if (slice.frame_num != p_slice->frame_num)
finish_frame = TRUE;
else if (slice.picture != p_slice->picture)
finish_frame = TRUE;
else if (slice.bottom_field_flag != p_slice->bottom_field_flag)
finish_frame = TRUE;
else if (nal_unit.ref_idc != p_slice->nal_unit.ref_idc &&
(nal_unit.ref_idc == 0 || p_slice->nal_unit.ref_idc == 0))
finish_frame = TRUE;
else if ((pic_order_cnt_type == 0 && p_pic_order_cnt_type == 0) &&
(slice.pic_order_cnt_lsb != p_slice->pic_order_cnt_lsb ||
slice.delta_pic_order_cnt_bottom !=
p_slice->delta_pic_order_cnt_bottom))
finish_frame = TRUE;
else if ((p_pic_order_cnt_type == 1 && p_pic_order_cnt_type == 1) &&
(slice.delta_pic_order_cnt[0] != p_slice->delta_pic_order_cnt[0] ||
slice.delta_pic_order_cnt[1] !=
p_slice->delta_pic_order_cnt[1]))
finish_frame = TRUE;
if (finish_frame)
ret =
gst_base_video_decoder_have_frame (base_video_decoder, FALSE,
&frame);
}
if (!GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_H264_FRAME_GOT_PRIMARY)) {
if (GST_H264_IS_I_SLICE (slice.type)
|| GST_H264_IS_SI_SLICE (slice.type))
GST_VIDEO_FRAME_FLAG_SET (frame, GST_VIDEO_FRAME_FLAG_KEYFRAME);
GST_H264_FRAME_CAST (frame)->slice_hdr = slice;
GST_VIDEO_FRAME_FLAG_SET (frame, GST_H264_FRAME_GOT_PRIMARY);
}
}
gst_h264_frame_add_slice ((GstH264Frame *) frame, buf);
}
if (nal_unit.type == GST_NAL_SPS) {
if (!gst_h264_parser_parse_sequence (h264_dec->parser, data, size))
goto invalid_packet;
}
if (nal_unit.type == GST_NAL_PPS) {
if (!gst_h264_parser_parse_picture (h264_dec->parser, data, size))
goto invalid_packet;
}
gst_buffer_unref (buf);
return ret;
invalid_packet:
GST_WARNING ("Invalid packet size!");
gst_buffer_unref (buf);
return GST_FLOW_OK;
}
static GstVideoFrame *
gst_vdp_h264_dec_create_frame (GstBaseVideoDecoder * base_video_decoder)
{
return GST_VIDEO_FRAME_CAST (gst_h264_frame_new ());
}
static gboolean
gst_vdp_h264_dec_flush (GstBaseVideoDecoder * base_video_decoder)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
h264_dec->got_idr = FALSE;
gst_h264_dpb_flush (h264_dec->dpb, FALSE);
return TRUE;
}
static gboolean
gst_vdp_h264_dec_start (GstBaseVideoDecoder * base_video_decoder)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
h264_dec->packetized = FALSE;
h264_dec->nal_length_size = SYNC_CODE_SIZE;
h264_dec->got_idr = FALSE;
h264_dec->sequence = NULL;
h264_dec->parser = g_object_new (GST_TYPE_H264_PARSER, NULL);
h264_dec->dpb = g_object_new (GST_TYPE_H264_DPB, NULL);
gst_h264_dpb_set_output_func (h264_dec->dpb, gst_vdp_h264_dec_output,
h264_dec);
return GST_BASE_VIDEO_DECODER_CLASS
(parent_class)->start (base_video_decoder);
}
static gboolean
gst_vdp_h264_dec_stop (GstBaseVideoDecoder * base_video_decoder)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
g_object_unref (h264_dec->parser);
g_object_unref (h264_dec->dpb);
return GST_BASE_VIDEO_DECODER_CLASS (parent_class)->stop (base_video_decoder);
}
static void
gst_vdp_h264_dec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_static_metadata (element_class,
"VDPAU H264 Decoder",
"Decoder",
"Decode h264 stream with vdpau",
"Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
}
static void
gst_vdp_h264_dec_init (GstVdpH264Dec * h264_dec, GstVdpH264DecClass * klass)
{
}
static void
gst_vdp_h264_dec_class_init (GstVdpH264DecClass * klass)
{
GstBaseVideoDecoderClass *base_video_decoder_class;
base_video_decoder_class = GST_BASE_VIDEO_DECODER_CLASS (klass);
base_video_decoder_class->start = gst_vdp_h264_dec_start;
base_video_decoder_class->stop = gst_vdp_h264_dec_stop;
base_video_decoder_class->flush = gst_vdp_h264_dec_flush;
base_video_decoder_class->set_sink_caps = gst_vdp_h264_dec_set_sink_caps;
base_video_decoder_class->scan_for_sync = gst_vdp_h264_dec_scan_for_sync;
base_video_decoder_class->scan_for_packet_end =
gst_vdp_h264_dec_scan_for_packet_end;
base_video_decoder_class->parse_data = gst_vdp_h264_dec_parse_data;
base_video_decoder_class->handle_frame = gst_vdp_h264_dec_handle_frame;
base_video_decoder_class->create_frame = gst_vdp_h264_dec_create_frame;
}
Reference in a new issue View git blame Copy permalink