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gstreamer/gst-libs/gst/codecs/gsth264decoder.c
Seungha Yang e78dc91f9e codecs: h264decoder: Fix for MMCO type 2 
As per 8.2.5.4.2, we should mark a picture which has
LongTermPicNum == long_term_pic_num as "unused for reference",
not pic_num.

Passing conformance bitstream test with MR2_MW_A

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1768>
2020-11-05 14:56:28 +00:00

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/* GStreamer
* Copyright (C) 2019 Seungha Yang <seungha.yang@navercorp.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.
*
* NOTE: some of implementations are copied/modified from Chromium code
*
* Copyright 2015 The Chromium Authors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* SECTION:gsth264decoder
* @title: GstH264Decoder
* @short_description: Base class to implement stateless H.264 decoders
* @sources:
* - gsth264picture.h
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gsth264decoder.h"
GST_DEBUG_CATEGORY (gst_h264_decoder_debug);
#define GST_CAT_DEFAULT gst_h264_decoder_debug
typedef enum
{
GST_H264_DECODER_FORMAT_NONE,
GST_H264_DECODER_FORMAT_AVC,
GST_H264_DECODER_FORMAT_BYTE
} GstH264DecoderFormat;
typedef enum
{
GST_H264_DECODER_ALIGN_NONE,
GST_H264_DECODER_ALIGN_NAL,
GST_H264_DECODER_ALIGN_AU
} GstH264DecoderAlign;
struct _GstH264DecoderPrivate
{
gint width, height;
gint fps_num, fps_den;
gint upstream_par_n, upstream_par_d;
gint parsed_par_n, parsed_par_d;
gint parsed_fps_n, parsed_fps_d;
GstVideoColorimetry parsed_colorimetry;
/* input codec_data, if any */
GstBuffer *codec_data;
guint nal_length_size;
/* state */
GstH264DecoderFormat in_format;
GstH264DecoderAlign align;
GstH264NalParser *parser;
GstH264Dpb *dpb;
GstFlowReturn last_ret;
/* used for low-latency vs. high throughput mode decision */
gboolean is_live;
/* sps/pps of the current slice */
const GstH264SPS *active_sps;
const GstH264PPS *active_pps;
/* Picture currently being processed/decoded */
GstH264Picture *current_picture;
GstVideoCodecFrame *current_frame;
/* Slice (slice header + nalu) currently being processed/decodec */
GstH264Slice current_slice;
gint max_frame_num;
gint max_pic_num;
gint max_long_term_frame_idx;
gsize max_num_reorder_frames;
gint prev_frame_num;
gint prev_ref_frame_num;
gint prev_frame_num_offset;
gboolean prev_has_memmgmnt5;
/* Values related to previously decoded reference picture */
gboolean prev_ref_has_memmgmnt5;
gint prev_ref_top_field_order_cnt;
gint prev_ref_pic_order_cnt_msb;
gint prev_ref_pic_order_cnt_lsb;
GstH264PictureField prev_ref_field;
/* PicOrderCount of the previously outputted frame */
gint last_output_poc;
gboolean process_ref_pic_lists;
/* Reference picture lists, constructed for each frame */
GArray *ref_pic_list_p0;
GArray *ref_pic_list_b0;
GArray *ref_pic_list_b1;
/* Reference picture lists, constructed for each slice */
GArray *ref_pic_list0;
GArray *ref_pic_list1;
};
#define parent_class gst_h264_decoder_parent_class
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstH264Decoder, gst_h264_decoder,
GST_TYPE_VIDEO_DECODER,
G_ADD_PRIVATE (GstH264Decoder);
GST_DEBUG_CATEGORY_INIT (gst_h264_decoder_debug, "h264decoder", 0,
"H.264 Video Decoder"));
static void gst_h264_decoder_finalize (GObject * object);
static gboolean gst_h264_decoder_start (GstVideoDecoder * decoder);
static gboolean gst_h264_decoder_stop (GstVideoDecoder * decoder);
static gboolean gst_h264_decoder_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state);
static GstFlowReturn gst_h264_decoder_finish (GstVideoDecoder * decoder);
static gboolean gst_h264_decoder_flush (GstVideoDecoder * decoder);
static GstFlowReturn gst_h264_decoder_drain (GstVideoDecoder * decoder);
static GstFlowReturn gst_h264_decoder_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame);
/* codec spcific functions */
static gboolean gst_h264_decoder_process_sps (GstH264Decoder * self,
GstH264SPS * sps);
static gboolean gst_h264_decoder_decode_slice (GstH264Decoder * self);
static gboolean gst_h264_decoder_decode_nal (GstH264Decoder * self,
GstH264NalUnit * nalu);
static gboolean gst_h264_decoder_fill_picture_from_slice (GstH264Decoder * self,
const GstH264Slice * slice, GstH264Picture * picture);
static gboolean gst_h264_decoder_calculate_poc (GstH264Decoder * self,
GstH264Picture * picture);
static gboolean gst_h264_decoder_init_gap_picture (GstH264Decoder * self,
GstH264Picture * picture, gint frame_num);
static gboolean gst_h264_decoder_drain_internal (GstH264Decoder * self);
static gboolean gst_h264_decoder_finish_current_picture (GstH264Decoder * self);
static gboolean gst_h264_decoder_finish_picture (GstH264Decoder * self,
GstH264Picture * picture);
static void gst_h264_decoder_prepare_ref_pic_lists (GstH264Decoder * self);
static void gst_h264_decoder_clear_ref_pic_lists (GstH264Decoder * self);
static gboolean gst_h264_decoder_modify_ref_pic_lists (GstH264Decoder * self);
static gboolean
gst_h264_decoder_sliding_window_picture_marking (GstH264Decoder * self);
static void gst_h264_decoder_do_output_picture (GstH264Decoder * self,
GstH264Picture * picture);
static void
gst_h264_decoder_class_init (GstH264DecoderClass * klass)
{
GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = GST_DEBUG_FUNCPTR (gst_h264_decoder_finalize);
decoder_class->start = GST_DEBUG_FUNCPTR (gst_h264_decoder_start);
decoder_class->stop = GST_DEBUG_FUNCPTR (gst_h264_decoder_stop);
decoder_class->set_format = GST_DEBUG_FUNCPTR (gst_h264_decoder_set_format);
decoder_class->finish = GST_DEBUG_FUNCPTR (gst_h264_decoder_finish);
decoder_class->flush = GST_DEBUG_FUNCPTR (gst_h264_decoder_flush);
decoder_class->drain = GST_DEBUG_FUNCPTR (gst_h264_decoder_drain);
decoder_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_h264_decoder_handle_frame);
}
static void
gst_h264_decoder_init (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv;
gst_video_decoder_set_packetized (GST_VIDEO_DECODER (self), TRUE);
self->priv = priv = gst_h264_decoder_get_instance_private (self);
priv->ref_pic_list_p0 = g_array_sized_new (FALSE, TRUE,
sizeof (GstH264Picture *), 32);
g_array_set_clear_func (priv->ref_pic_list_p0,
(GDestroyNotify) gst_h264_picture_clear);
priv->ref_pic_list_b0 = g_array_sized_new (FALSE, TRUE,
sizeof (GstH264Picture *), 32);
g_array_set_clear_func (priv->ref_pic_list_b0,
(GDestroyNotify) gst_h264_picture_clear);
priv->ref_pic_list_b1 = g_array_sized_new (FALSE, TRUE,
sizeof (GstH264Picture *), 32);
g_array_set_clear_func (priv->ref_pic_list_b1,
(GDestroyNotify) gst_h264_picture_clear);
priv->ref_pic_list0 = g_array_sized_new (FALSE, TRUE,
sizeof (GstH264Picture *), 32);
priv->ref_pic_list1 = g_array_sized_new (FALSE, TRUE,
sizeof (GstH264Picture *), 32);
}
static void
gst_h264_decoder_finalize (GObject * object)
{
GstH264Decoder *self = GST_H264_DECODER (object);
GstH264DecoderPrivate *priv = self->priv;
g_array_unref (priv->ref_pic_list_p0);
g_array_unref (priv->ref_pic_list_b0);
g_array_unref (priv->ref_pic_list_b1);
g_array_unref (priv->ref_pic_list0);
g_array_unref (priv->ref_pic_list1);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_h264_decoder_start (GstVideoDecoder * decoder)
{
GstH264Decoder *self = GST_H264_DECODER (decoder);
GstH264DecoderPrivate *priv = self->priv;
priv->parser = gst_h264_nal_parser_new ();
priv->dpb = gst_h264_dpb_new ();
return TRUE;
}
static gboolean
gst_h264_decoder_stop (GstVideoDecoder * decoder)
{
GstH264Decoder *self = GST_H264_DECODER (decoder);
GstH264DecoderPrivate *priv = self->priv;
if (self->input_state) {
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
}
gst_clear_buffer (&priv->codec_data);
if (priv->parser) {
gst_h264_nal_parser_free (priv->parser);
priv->parser = NULL;
}
if (priv->dpb) {
gst_h264_dpb_free (priv->dpb);
priv->dpb = NULL;
}
return TRUE;
}
static void
gst_h264_decoder_clear_dpb (GstH264Decoder * self, gboolean flush)
{
GstVideoDecoder *decoder = GST_VIDEO_DECODER (self);
GstH264DecoderPrivate *priv = self->priv;
GstH264Picture *picture;
/* If we are not flushing now, videodecoder baseclass will hold
* GstVideoCodecFrame. Release frames manually */
if (!flush) {
while ((picture = gst_h264_dpb_bump (priv->dpb, TRUE)) != NULL) {
GstVideoCodecFrame *frame = gst_video_decoder_get_frame (decoder,
picture->system_frame_number);
if (frame)
gst_video_decoder_release_frame (decoder, frame);
gst_h264_picture_unref (picture);
}
}
gst_h264_decoder_clear_ref_pic_lists (self);
gst_h264_dpb_clear (priv->dpb);
priv->last_output_poc = 0;
}
static gboolean
gst_h264_decoder_flush (GstVideoDecoder * decoder)
{
GstH264Decoder *self = GST_H264_DECODER (decoder);
gst_h264_decoder_clear_dpb (self, TRUE);
return TRUE;
}
static GstFlowReturn
gst_h264_decoder_drain (GstVideoDecoder * decoder)
{
GstH264Decoder *self = GST_H264_DECODER (decoder);
GstH264DecoderPrivate *priv = self->priv;
priv->last_ret = GST_FLOW_OK;
/* dpb will be cleared by this method */
gst_h264_decoder_drain_internal (self);
return priv->last_ret;
}
static GstFlowReturn
gst_h264_decoder_finish (GstVideoDecoder * decoder)
{
return gst_h264_decoder_drain (decoder);
}
static GstFlowReturn
gst_h264_decoder_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame)
{
GstH264Decoder *self = GST_H264_DECODER (decoder);
GstH264DecoderPrivate *priv = self->priv;
GstBuffer *in_buf = frame->input_buffer;
GstH264NalUnit nalu;
GstH264ParserResult pres;
GstMapInfo map;
gboolean decode_ret = TRUE;
GST_LOG_OBJECT (self,
"handle frame, PTS: %" GST_TIME_FORMAT ", DTS: %"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_PTS (in_buf)),
GST_TIME_ARGS (GST_BUFFER_DTS (in_buf)));
priv->current_frame = frame;
priv->last_ret = GST_FLOW_OK;
gst_buffer_map (in_buf, &map, GST_MAP_READ);
if (priv->in_format == GST_H264_DECODER_FORMAT_AVC) {
pres = gst_h264_parser_identify_nalu_avc (priv->parser,
map.data, 0, map.size, priv->nal_length_size, &nalu);
while (pres == GST_H264_PARSER_OK && decode_ret) {
decode_ret = gst_h264_decoder_decode_nal (self, &nalu);
pres = gst_h264_parser_identify_nalu_avc (priv->parser,
map.data, nalu.offset + nalu.size, map.size, priv->nal_length_size,
&nalu);
}
} else {
pres = gst_h264_parser_identify_nalu (priv->parser,
map.data, 0, map.size, &nalu);
if (pres == GST_H264_PARSER_NO_NAL_END)
pres = GST_H264_PARSER_OK;
while (pres == GST_H264_PARSER_OK && decode_ret) {
decode_ret = gst_h264_decoder_decode_nal (self, &nalu);
pres = gst_h264_parser_identify_nalu (priv->parser,
map.data, nalu.offset + nalu.size, map.size, &nalu);
if (pres == GST_H264_PARSER_NO_NAL_END)
pres = GST_H264_PARSER_OK;
}
}
gst_buffer_unmap (in_buf, &map);
if (!decode_ret) {
GST_VIDEO_DECODER_ERROR (self, 1, STREAM, DECODE,
("Failed to decode data"), (NULL), priv->last_ret);
gst_video_decoder_drop_frame (decoder, frame);
gst_h264_picture_clear (&priv->current_picture);
priv->current_frame = NULL;
return priv->last_ret;
}
gst_h264_decoder_finish_current_picture (self);
gst_video_codec_frame_unref (frame);
priv->current_frame = NULL;
return priv->last_ret;
}
static gboolean
gst_h264_decoder_parse_sps (GstH264Decoder * self, GstH264NalUnit * nalu)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264SPS sps;
GstH264ParserResult pres;
gboolean ret;
pres = gst_h264_parse_sps (nalu, &sps);
if (pres != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (self, "Failed to parse SPS, result %d", pres);
return FALSE;
}
GST_LOG_OBJECT (self, "SPS parsed");
ret = gst_h264_decoder_process_sps (self, &sps);
if (!ret) {
GST_WARNING_OBJECT (self, "Failed to process SPS");
} else if (gst_h264_parser_update_sps (priv->parser,
&sps) != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (self, "Failed to update SPS");
ret = FALSE;
}
gst_h264_sps_clear (&sps);
return ret;
}
static gboolean
gst_h264_decoder_parse_pps (GstH264Decoder * self, GstH264NalUnit * nalu)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264PPS pps;
GstH264ParserResult pres;
gboolean ret = TRUE;
pres = gst_h264_parse_pps (priv->parser, nalu, &pps);
if (pres != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (self, "Failed to parse PPS, result %d", pres);
return FALSE;
}
GST_LOG_OBJECT (self, "PPS parsed");
if (pps.num_slice_groups_minus1 > 0) {
GST_FIXME_OBJECT (self, "FMO is not supported");
ret = FALSE;
} else if (gst_h264_parser_update_pps (priv->parser, &pps)
!= GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (self, "Failed to update PPS");
ret = FALSE;
}
gst_h264_pps_clear (&pps);
return ret;
}
static gboolean
gst_h264_decoder_parse_codec_data (GstH264Decoder * self, const guint8 * data,
gsize size)
{
GstH264DecoderPrivate *priv = self->priv;
guint num_sps, num_pps;
guint off;
gint i;
GstH264ParserResult pres;
GstH264NalUnit nalu;
#ifndef GST_DISABLE_GST_DEBUG
guint profile;
#endif
/* parse the avcC data */
if (size < 7) { /* when numSPS==0 and numPPS==0, length is 7 bytes */
return FALSE;
}
/* parse the version, this must be 1 */
if (data[0] != 1) {
return FALSE;
}
#ifndef GST_DISABLE_GST_DEBUG
/* AVCProfileIndication */
/* profile_compat */
/* AVCLevelIndication */
profile = (data[1] << 16) | (data[2] << 8) | data[3];
GST_DEBUG_OBJECT (self, "profile %06x", profile);
#endif
/* 6 bits reserved | 2 bits lengthSizeMinusOne */
/* this is the number of bytes in front of the NAL units to mark their
* length */
priv->nal_length_size = (data[4] & 0x03) + 1;
GST_DEBUG_OBJECT (self, "nal length size %u", priv->nal_length_size);
num_sps = data[5] & 0x1f;
off = 6;
for (i = 0; i < num_sps; i++) {
pres = gst_h264_parser_identify_nalu_avc (priv->parser,
data, off, size, 2, &nalu);
if (pres != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (self, "Failed to identify SPS nalu");
return FALSE;
}
if (!gst_h264_decoder_parse_sps (self, &nalu)) {
GST_WARNING_OBJECT (self, "Failed to parse SPS");
return FALSE;
}
off = nalu.offset + nalu.size;
}
if (off >= size) {
GST_WARNING_OBJECT (self, "Too small avcC");
return FALSE;
}
num_pps = data[off];
off++;
for (i = 0; i < num_pps; i++) {
pres = gst_h264_parser_identify_nalu_avc (priv->parser,
data, off, size, 2, &nalu);
if (pres != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (self, "Failed to identify PPS nalu");
return FALSE;
}
if (!gst_h264_decoder_parse_pps (self, &nalu)) {
GST_WARNING_OBJECT (self, "Failed to parse PPS");
return FALSE;
}
off = nalu.offset + nalu.size;
}
return TRUE;
}
static gboolean
gst_h264_decoder_preprocess_slice (GstH264Decoder * self, GstH264Slice * slice)
{
GstH264DecoderPrivate *priv = self->priv;
if (!priv->current_picture) {
if (slice->header.first_mb_in_slice != 0) {
GST_ERROR_OBJECT (self, "Invalid stream, first_mb_in_slice %d",
slice->header.first_mb_in_slice);
return FALSE;
}
}
return TRUE;
}
static void
gst_h264_decoder_update_pic_nums (GstH264Decoder * self, gint frame_num)
{
GstH264DecoderPrivate *priv = self->priv;
GArray *dpb = gst_h264_dpb_get_pictures_all (priv->dpb);
gint i;
for (i = 0; i < dpb->len; i++) {
GstH264Picture *picture = g_array_index (dpb, GstH264Picture *, i);
if (picture->field != GST_H264_PICTURE_FIELD_FRAME) {
GST_FIXME_OBJECT (self, "Interlaced video not supported");
continue;
}
if (!picture->ref)
continue;
if (picture->long_term) {
picture->long_term_pic_num = picture->long_term_frame_idx;
} else {
if (picture->frame_num > frame_num)
picture->frame_num_wrap = picture->frame_num - priv->max_frame_num;
else
picture->frame_num_wrap = picture->frame_num;
picture->pic_num = picture->frame_num_wrap;
}
}
g_array_unref (dpb);
}
static gboolean
gst_h264_decoder_handle_frame_num_gap (GstH264Decoder * self, gint frame_num)
{
GstH264DecoderPrivate *priv = self->priv;
const GstH264SPS *sps = priv->active_sps;
gint unused_short_term_frame_num;
if (!sps) {
GST_ERROR_OBJECT (self, "No active sps");
return FALSE;
}
if (priv->prev_ref_frame_num == frame_num) {
GST_TRACE_OBJECT (self,
"frame_num == PrevRefFrameNum (%d), not a gap", frame_num);
return TRUE;
}
if (((priv->prev_ref_frame_num + 1) % priv->max_frame_num) == frame_num) {
GST_TRACE_OBJECT (self,
"frame_num == (PrevRefFrameNum + 1) %% MaxFrameNum (%d), not a gap",
frame_num);
return TRUE;
}
if (gst_h264_dpb_get_size (priv->dpb) == 0) {
GST_TRACE_OBJECT (self, "DPB is empty, not a gap");
return TRUE;
}
if (!sps->gaps_in_frame_num_value_allowed_flag) {
/* This is likely the case where some frames were dropped.
* then we need to keep decoding without error out */
GST_WARNING_OBJECT (self, "Invalid frame num %d", frame_num);
}
GST_DEBUG_OBJECT (self, "Handling frame num gap %d -> %d (MaxFrameNum: %d)",
priv->prev_ref_frame_num, frame_num, priv->max_frame_num);
/* 7.4.3/7-23 */
unused_short_term_frame_num =
(priv->prev_ref_frame_num + 1) % priv->max_frame_num;
while (unused_short_term_frame_num != frame_num) {
GstH264Picture *picture = gst_h264_picture_new ();
if (!gst_h264_decoder_init_gap_picture (self, picture,
unused_short_term_frame_num))
return FALSE;
gst_h264_decoder_update_pic_nums (self, unused_short_term_frame_num);
/* C.2.1 */
if (!gst_h264_decoder_sliding_window_picture_marking (self)) {
GST_ERROR_OBJECT (self,
"Couldn't perform sliding window picture marking");
return FALSE;
}
gst_h264_dpb_delete_unused (priv->dpb);
gst_h264_dpb_add (priv->dpb, picture);
while (gst_h264_dpb_needs_bump (priv->dpb, priv->max_num_reorder_frames,
FALSE)) {
GstH264Picture *to_output;
to_output = gst_h264_dpb_bump (priv->dpb, FALSE);
if (!to_output) {
GST_WARNING_OBJECT (self, "Bumping is needed but no picture to output");
break;
}
gst_h264_decoder_do_output_picture (self, to_output);
}
unused_short_term_frame_num++;
unused_short_term_frame_num %= priv->max_frame_num;
}
return TRUE;
}
static gboolean
gst_h264_decoder_init_current_picture (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
if (!gst_h264_decoder_fill_picture_from_slice (self, &priv->current_slice,
priv->current_picture)) {
return FALSE;
}
if (!gst_h264_decoder_calculate_poc (self, priv->current_picture))
return FALSE;
/* If the slice header indicates we will have to perform reference marking
* process after this picture is decoded, store required data for that
* purpose */
if (priv->current_slice.header.
dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag) {
priv->current_picture->dec_ref_pic_marking =
priv->current_slice.header.dec_ref_pic_marking;
}
return TRUE;
}
static gboolean
gst_h264_decoder_start_current_picture (GstH264Decoder * self)
{
GstH264DecoderClass *klass;
GstH264DecoderPrivate *priv = self->priv;
const GstH264SPS *sps;
gint frame_num;
gboolean ret = TRUE;
GstH264Picture *current_picture;
g_assert (priv->current_picture != NULL);
g_assert (priv->active_sps != NULL);
g_assert (priv->active_pps != NULL);
sps = priv->active_sps;
priv->max_frame_num = sps->max_frame_num;
frame_num = priv->current_slice.header.frame_num;
if (priv->current_slice.nalu.idr_pic_flag)
priv->prev_ref_frame_num = 0;
if (!gst_h264_decoder_handle_frame_num_gap (self, frame_num))
return FALSE;
if (!gst_h264_decoder_init_current_picture (self))
return FALSE;
current_picture = priv->current_picture;
/* If the new picture is an IDR, flush DPB */
if (current_picture->idr) {
if (!current_picture->dec_ref_pic_marking.no_output_of_prior_pics_flag) {
gst_h264_decoder_drain_internal (self);
} else {
/* C.4.4 Removal of pictures from the DPB before possible insertion
* of the current picture
*
* If decoded picture is IDR and no_output_of_prior_pics_flag is equal to 1
* or is inferred to be equal to 1, all frame buffers in the DPB
* are emptied without output of the pictures they contain,
* and DPB fullness is set to 0.
*/
gst_h264_decoder_clear_dpb (self, FALSE);
}
}
gst_h264_decoder_update_pic_nums (self, frame_num);
if (priv->process_ref_pic_lists)
gst_h264_decoder_prepare_ref_pic_lists (self);
klass = GST_H264_DECODER_GET_CLASS (self);
if (klass->start_picture)
ret = klass->start_picture (self, priv->current_picture,
&priv->current_slice, priv->dpb);
if (!ret) {
GST_ERROR_OBJECT (self, "subclass does not want to start picture");
return FALSE;
}
return TRUE;
}
static gboolean
gst_h264_decoder_parse_slice (GstH264Decoder * self, GstH264NalUnit * nalu)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264ParserResult pres = GST_H264_PARSER_OK;
memset (&priv->current_slice, 0, sizeof (GstH264Slice));
pres = gst_h264_parser_parse_slice_hdr (priv->parser, nalu,
&priv->current_slice.header, TRUE, TRUE);
if (pres != GST_H264_PARSER_OK) {
GST_ERROR_OBJECT (self, "Failed to parse slice header, ret %d", pres);
memset (&priv->current_slice, 0, sizeof (GstH264Slice));
return FALSE;
}
priv->current_slice.nalu = *nalu;
if (!gst_h264_decoder_preprocess_slice (self, &priv->current_slice))
return FALSE;
priv->active_pps = priv->current_slice.header.pps;
priv->active_sps = priv->active_pps->sequence;
if (!priv->current_picture) {
GstH264DecoderClass *klass = GST_H264_DECODER_GET_CLASS (self);
GstH264Picture *picture;
gboolean ret = TRUE;
picture = gst_h264_picture_new ();
/* This allows accessing the frame from the picture. */
picture->system_frame_number = priv->current_frame->system_frame_number;
priv->current_picture = picture;
g_assert (priv->current_frame);
if (klass->new_picture)
ret = klass->new_picture (self, priv->current_frame, picture);
if (!ret) {
GST_ERROR_OBJECT (self, "subclass does not want accept new picture");
priv->current_picture = NULL;
gst_h264_picture_unref (picture);
return FALSE;
}
if (!gst_h264_decoder_start_current_picture (self)) {
GST_ERROR_OBJECT (self, "start picture failed");
return FALSE;
}
}
return gst_h264_decoder_decode_slice (self);
}
static gboolean
gst_h264_decoder_decode_nal (GstH264Decoder * self, GstH264NalUnit * nalu)
{
gboolean ret = TRUE;
GST_LOG_OBJECT (self, "Parsed nal type: %d, offset %d, size %d",
nalu->type, nalu->offset, nalu->size);
switch (nalu->type) {
case GST_H264_NAL_SPS:
ret = gst_h264_decoder_parse_sps (self, nalu);
break;
case GST_H264_NAL_PPS:
ret = gst_h264_decoder_parse_pps (self, nalu);
break;
case GST_H264_NAL_SLICE:
case GST_H264_NAL_SLICE_DPA:
case GST_H264_NAL_SLICE_DPB:
case GST_H264_NAL_SLICE_DPC:
case GST_H264_NAL_SLICE_IDR:
case GST_H264_NAL_SLICE_EXT:
ret = gst_h264_decoder_parse_slice (self, nalu);
break;
default:
break;
}
return ret;
}
static void
gst_h264_decoder_format_from_caps (GstH264Decoder * self, GstCaps * caps,
GstH264DecoderFormat * format, GstH264DecoderAlign * align)
{
if (format)
*format = GST_H264_DECODER_FORMAT_NONE;
if (align)
*align = GST_H264_DECODER_ALIGN_NONE;
if (!gst_caps_is_fixed (caps)) {
GST_WARNING_OBJECT (self, "Caps wasn't fixed");
return;
}
GST_DEBUG_OBJECT (self, "parsing caps: %" GST_PTR_FORMAT, caps);
if (caps && gst_caps_get_size (caps) > 0) {
GstStructure *s = gst_caps_get_structure (caps, 0);
const gchar *str = NULL;
if (format) {
if ((str = gst_structure_get_string (s, "stream-format"))) {
if (strcmp (str, "avc") == 0 || strcmp (str, "avc3") == 0)
*format = GST_H264_DECODER_FORMAT_AVC;
else if (strcmp (str, "byte-stream") == 0)
*format = GST_H264_DECODER_FORMAT_BYTE;
}
}
if (align) {
if ((str = gst_structure_get_string (s, "alignment"))) {
if (strcmp (str, "au") == 0)
*align = GST_H264_DECODER_ALIGN_AU;
else if (strcmp (str, "nal") == 0)
*align = GST_H264_DECODER_ALIGN_NAL;
}
}
}
}
static gboolean
gst_h264_decoder_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state)
{
GstH264Decoder *self = GST_H264_DECODER (decoder);
GstH264DecoderPrivate *priv = self->priv;
GstQuery *query;
GST_DEBUG_OBJECT (decoder, "Set format");
if (self->input_state)
gst_video_codec_state_unref (self->input_state);
self->input_state = gst_video_codec_state_ref (state);
if (state->caps) {
GstStructure *str;
const GValue *codec_data_value;
GstH264DecoderFormat format;
GstH264DecoderAlign align;
gst_h264_decoder_format_from_caps (self, state->caps, &format, &align);
str = gst_caps_get_structure (state->caps, 0);
codec_data_value = gst_structure_get_value (str, "codec_data");
if (GST_VALUE_HOLDS_BUFFER (codec_data_value)) {
gst_buffer_replace (&priv->codec_data,
gst_value_get_buffer (codec_data_value));
} else {
gst_buffer_replace (&priv->codec_data, NULL);
}
if (format == GST_H264_DECODER_FORMAT_NONE) {
/* codec_data implies avc */
if (codec_data_value != NULL) {
GST_WARNING_OBJECT (self,
"video/x-h264 caps with codec_data but no stream-format=avc");
format = GST_H264_DECODER_FORMAT_AVC;
} else {
/* otherwise assume bytestream input */
GST_WARNING_OBJECT (self,
"video/x-h264 caps without codec_data or stream-format");
format = GST_H264_DECODER_FORMAT_BYTE;
}
}
if (format == GST_H264_DECODER_FORMAT_AVC) {
/* AVC requires codec_data, AVC3 might have one and/or SPS/PPS inline */
if (codec_data_value == NULL) {
/* Try it with size 4 anyway */
priv->nal_length_size = 4;
GST_WARNING_OBJECT (self,
"avc format without codec data, assuming nal length size is 4");
}
/* AVC implies alignment=au */
if (align == GST_H264_DECODER_ALIGN_NONE)
align = GST_H264_DECODER_ALIGN_AU;
}
if (format == GST_H264_DECODER_FORMAT_BYTE) {
if (codec_data_value != NULL) {
GST_WARNING_OBJECT (self, "bytestream with codec data");
}
}
priv->in_format = format;
priv->align = align;
}
if (priv->codec_data) {
GstMapInfo map;
gst_buffer_map (priv->codec_data, &map, GST_MAP_READ);
if (!gst_h264_decoder_parse_codec_data (self, map.data, map.size)) {
/* keep going without error.
* Probably inband SPS/PPS might be valid data */
GST_WARNING_OBJECT (self, "Failed to handle codec data");
}
gst_buffer_unmap (priv->codec_data, &map);
}
/* in case live streaming, we will run on low-latency mode */
priv->is_live = FALSE;
query = gst_query_new_latency ();
if (gst_pad_peer_query (GST_VIDEO_DECODER_SINK_PAD (self), query))
gst_query_parse_latency (query, &priv->is_live, NULL, NULL);
gst_query_unref (query);
if (priv->is_live)
GST_DEBUG_OBJECT (self, "Live source, will run on low-latency mode");
return TRUE;
}
static gboolean
gst_h264_decoder_fill_picture_from_slice (GstH264Decoder * self,
const GstH264Slice * slice, GstH264Picture * picture)
{
const GstH264SliceHdr *slice_hdr = &slice->header;
const GstH264PPS *pps;
const GstH264SPS *sps;
pps = slice_hdr->pps;
if (!pps) {
GST_ERROR_OBJECT (self, "No pps in slice header");
return FALSE;
}
sps = pps->sequence;
if (!sps) {
GST_ERROR_OBJECT (self, "No sps in pps");
return FALSE;
}
picture->idr = slice->nalu.idr_pic_flag;
picture->dec_ref_pic_marking = slice_hdr->dec_ref_pic_marking;
if (picture->idr)
picture->idr_pic_id = slice_hdr->idr_pic_id;
if (slice_hdr->field_pic_flag)
picture->field =
slice_hdr->bottom_field_flag ?
GST_H264_PICTURE_FIELD_BOTTOM_FIELD : GST_H264_PICTURE_FIELD_TOP_FIELD;
else
picture->field = GST_H264_PICTURE_FIELD_FRAME;
if (picture->field != GST_H264_PICTURE_FIELD_FRAME) {
GST_FIXME ("Interlace video not supported");
return FALSE;
}
picture->nal_ref_idc = slice->nalu.ref_idc;
picture->ref = slice->nalu.ref_idc != 0;
/* This assumes non-interlaced stream */
picture->frame_num = picture->pic_num = slice_hdr->frame_num;
picture->pic_order_cnt_type = sps->pic_order_cnt_type;
switch (picture->pic_order_cnt_type) {
case 0:
picture->pic_order_cnt_lsb = slice_hdr->pic_order_cnt_lsb;
picture->delta_pic_order_cnt_bottom =
slice_hdr->delta_pic_order_cnt_bottom;
break;
case 1:
picture->delta_pic_order_cnt0 = slice_hdr->delta_pic_order_cnt[0];
picture->delta_pic_order_cnt1 = slice_hdr->delta_pic_order_cnt[1];
break;
case 2:
break;
default:
g_assert_not_reached ();
return FALSE;
}
return TRUE;
}
static gboolean
gst_h264_decoder_calculate_poc (GstH264Decoder * self, GstH264Picture * picture)
{
GstH264DecoderPrivate *priv = self->priv;
const GstH264SPS *sps = priv->active_sps;
if (!sps) {
GST_ERROR_OBJECT (self, "No active SPS");
return FALSE;
}
switch (picture->pic_order_cnt_type) {
case 0:{
/* See spec 8.2.1.1 */
gint prev_pic_order_cnt_msb, prev_pic_order_cnt_lsb;
gint max_pic_order_cnt_lsb;
if (picture->idr) {
prev_pic_order_cnt_msb = prev_pic_order_cnt_lsb = 0;
} else {
if (priv->prev_ref_has_memmgmnt5) {
if (priv->prev_ref_field != GST_H264_PICTURE_FIELD_BOTTOM_FIELD) {
prev_pic_order_cnt_msb = 0;
prev_pic_order_cnt_lsb = priv->prev_ref_top_field_order_cnt;
} else {
prev_pic_order_cnt_msb = 0;
prev_pic_order_cnt_lsb = 0;
}
} else {
prev_pic_order_cnt_msb = priv->prev_ref_pic_order_cnt_msb;
prev_pic_order_cnt_lsb = priv->prev_ref_pic_order_cnt_lsb;
}
}
max_pic_order_cnt_lsb = 1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
if ((picture->pic_order_cnt_lsb < prev_pic_order_cnt_lsb) &&
(prev_pic_order_cnt_lsb - picture->pic_order_cnt_lsb >=
max_pic_order_cnt_lsb / 2)) {
picture->pic_order_cnt_msb =
prev_pic_order_cnt_msb + max_pic_order_cnt_lsb;
} else if ((picture->pic_order_cnt_lsb > prev_pic_order_cnt_lsb)
&& (picture->pic_order_cnt_lsb - prev_pic_order_cnt_lsb >
max_pic_order_cnt_lsb / 2)) {
picture->pic_order_cnt_msb =
prev_pic_order_cnt_msb - max_pic_order_cnt_lsb;
} else {
picture->pic_order_cnt_msb = prev_pic_order_cnt_msb;
}
if (picture->field != GST_H264_PICTURE_FIELD_BOTTOM_FIELD) {
picture->top_field_order_cnt =
picture->pic_order_cnt_msb + picture->pic_order_cnt_lsb;
}
if (picture->field != GST_H264_PICTURE_FIELD_TOP_FIELD) {
if (picture->field == GST_H264_PICTURE_FIELD_FRAME) {
picture->bottom_field_order_cnt =
picture->top_field_order_cnt +
picture->delta_pic_order_cnt_bottom;
} else {
picture->bottom_field_order_cnt =
picture->pic_order_cnt_msb + picture->pic_order_cnt_lsb;
}
}
break;
}
case 1:{
gint abs_frame_num = 0;
gint expected_pic_order_cnt = 0;
gint i;
/* See spec 8.2.1.2 */
if (priv->prev_has_memmgmnt5)
priv->prev_frame_num_offset = 0;
if (picture->idr)
picture->frame_num_offset = 0;
else if (priv->prev_frame_num > picture->frame_num)
picture->frame_num_offset =
priv->prev_frame_num_offset + priv->max_frame_num;
else
picture->frame_num_offset = priv->prev_frame_num_offset;
if (sps->num_ref_frames_in_pic_order_cnt_cycle != 0)
abs_frame_num = picture->frame_num_offset + picture->frame_num;
else
abs_frame_num = 0;
if (picture->nal_ref_idc == 0 && abs_frame_num > 0)
--abs_frame_num;
if (abs_frame_num > 0) {
gint pic_order_cnt_cycle_cnt, frame_num_in_pic_order_cnt_cycle;
gint expected_delta_per_pic_order_cnt_cycle = 0;
if (sps->num_ref_frames_in_pic_order_cnt_cycle == 0) {
GST_WARNING_OBJECT (self,
"Invalid num_ref_frames_in_pic_order_cnt_cycle in stream");
return FALSE;
}
pic_order_cnt_cycle_cnt =
(abs_frame_num - 1) / sps->num_ref_frames_in_pic_order_cnt_cycle;
frame_num_in_pic_order_cnt_cycle =
(abs_frame_num - 1) % sps->num_ref_frames_in_pic_order_cnt_cycle;
for (i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++) {
expected_delta_per_pic_order_cnt_cycle +=
sps->offset_for_ref_frame[i];
}
expected_pic_order_cnt = pic_order_cnt_cycle_cnt *
expected_delta_per_pic_order_cnt_cycle;
/* frame_num_in_pic_order_cnt_cycle is verified < 255 in parser */
for (i = 0; i <= frame_num_in_pic_order_cnt_cycle; ++i)
expected_pic_order_cnt += sps->offset_for_ref_frame[i];
}
if (!picture->nal_ref_idc)
expected_pic_order_cnt += sps->offset_for_non_ref_pic;
if (picture->field == GST_H264_PICTURE_FIELD_FRAME) {
picture->top_field_order_cnt =
expected_pic_order_cnt + picture->delta_pic_order_cnt0;
picture->bottom_field_order_cnt = picture->top_field_order_cnt +
sps->offset_for_top_to_bottom_field + picture->delta_pic_order_cnt1;
} else if (picture->field != GST_H264_PICTURE_FIELD_BOTTOM_FIELD) {
picture->top_field_order_cnt =
expected_pic_order_cnt + picture->delta_pic_order_cnt0;
} else {
picture->bottom_field_order_cnt = expected_pic_order_cnt +
sps->offset_for_top_to_bottom_field + picture->delta_pic_order_cnt0;
}
break;
}
case 2:{
gint temp_pic_order_cnt;
/* See spec 8.2.1.3 */
if (priv->prev_has_memmgmnt5)
priv->prev_frame_num_offset = 0;
if (picture->idr)
picture->frame_num_offset = 0;
else if (priv->prev_frame_num > picture->frame_num)
picture->frame_num_offset =
priv->prev_frame_num_offset + priv->max_frame_num;
else
picture->frame_num_offset = priv->prev_frame_num_offset;
if (picture->idr) {
temp_pic_order_cnt = 0;
} else if (!picture->nal_ref_idc) {
temp_pic_order_cnt =
2 * (picture->frame_num_offset + picture->frame_num) - 1;
} else {
temp_pic_order_cnt =
2 * (picture->frame_num_offset + picture->frame_num);
}
if (picture->field == GST_H264_PICTURE_FIELD_FRAME) {
picture->top_field_order_cnt = temp_pic_order_cnt;
picture->bottom_field_order_cnt = temp_pic_order_cnt;
} else if (picture->field == GST_H264_PICTURE_FIELD_BOTTOM_FIELD) {
picture->bottom_field_order_cnt = temp_pic_order_cnt;
} else {
picture->top_field_order_cnt = temp_pic_order_cnt;
}
break;
}
default:
GST_WARNING_OBJECT (self,
"Invalid pic_order_cnt_type: %d", sps->pic_order_cnt_type);
return FALSE;
}
switch (picture->field) {
case GST_H264_PICTURE_FIELD_FRAME:
picture->pic_order_cnt =
MIN (picture->top_field_order_cnt, picture->bottom_field_order_cnt);
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
picture->pic_order_cnt = picture->top_field_order_cnt;
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
picture->pic_order_cnt = picture->bottom_field_order_cnt;
break;
default:
g_assert_not_reached ();
return FALSE;
}
return TRUE;
}
static void
gst_h264_decoder_do_output_picture (GstH264Decoder * self,
GstH264Picture * picture)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264DecoderClass *klass;
GstVideoCodecFrame *frame = NULL;
GST_LOG_OBJECT (self, "Outputting picture %p (frame_num %d, poc %d)",
picture, picture->frame_num, picture->pic_order_cnt);
if (picture->pic_order_cnt < priv->last_output_poc) {
GST_WARNING_OBJECT (self,
"Outputting out of order %d -> %d, likely a broken stream",
priv->last_output_poc, picture->pic_order_cnt);
}
priv->last_output_poc = picture->pic_order_cnt;
frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self),
picture->system_frame_number);
if (!frame) {
GST_ERROR_OBJECT (self,
"No available codec frame with frame number %d",
picture->system_frame_number);
priv->last_ret = GST_FLOW_ERROR;
gst_h264_picture_unref (picture);
return;
}
klass = GST_H264_DECODER_GET_CLASS (self);
g_assert (klass->output_picture);
priv->last_ret = klass->output_picture (self, frame, picture);
}
static gboolean
gst_h264_decoder_finish_current_picture (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264DecoderClass *klass;
gboolean ret = TRUE;
if (!priv->current_picture)
return TRUE;
klass = GST_H264_DECODER_GET_CLASS (self);
if (klass->end_picture) {
if (!klass->end_picture (self, priv->current_picture)) {
GST_WARNING_OBJECT (self,
"end picture failed, marking picture %p non-existing "
"(frame_num %d, poc %d)", priv->current_picture,
priv->current_picture->frame_num,
priv->current_picture->pic_order_cnt);
priv->current_picture->nonexisting = TRUE;
/* this fake nonexisting picture will not trigger ouput_picture() */
gst_video_decoder_drop_frame (GST_VIDEO_DECODER (self),
gst_video_codec_frame_ref (priv->current_frame));
}
}
/* We no longer need the per frame reference lists */
gst_h264_decoder_clear_ref_pic_lists (self);
/* finish picture takes ownership of the picture */
ret = gst_h264_decoder_finish_picture (self, priv->current_picture);
priv->current_picture = NULL;
if (!ret) {
GST_ERROR_OBJECT (self, "Failed to finish picture");
return FALSE;
}
return TRUE;
}
static gint
poc_asc_compare (const GstH264Picture ** a, const GstH264Picture ** b)
{
return (*a)->pic_order_cnt - (*b)->pic_order_cnt;
}
static gint
poc_desc_compare (const GstH264Picture ** a, const GstH264Picture ** b)
{
return (*b)->pic_order_cnt - (*a)->pic_order_cnt;
}
static gboolean
gst_h264_decoder_drain_internal (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264Picture *picture;
while ((picture = gst_h264_dpb_bump (priv->dpb, TRUE)) != NULL) {
gst_h264_decoder_do_output_picture (self, picture);
}
gst_h264_dpb_clear (priv->dpb);
priv->last_output_poc = 0;
return TRUE;
}
static gboolean
gst_h264_decoder_handle_memory_management_opt (GstH264Decoder * self,
GstH264Picture * picture)
{
GstH264DecoderPrivate *priv = self->priv;
gint i;
for (i = 0; i < G_N_ELEMENTS (picture->dec_ref_pic_marking.ref_pic_marking);
i++) {
GstH264RefPicMarking *ref_pic_marking =
&picture->dec_ref_pic_marking.ref_pic_marking[i];
guint8 type = ref_pic_marking->memory_management_control_operation;
GST_TRACE_OBJECT (self, "memory management operation %d, type %d", i, type);
/* Normal end of operations' specification */
if (type == 0)
return TRUE;
switch (type) {
case 4:
priv->max_long_term_frame_idx =
ref_pic_marking->max_long_term_frame_idx_plus1 - 1;
break;
case 5:
priv->max_long_term_frame_idx = -1;
break;
default:
break;
}
if (!gst_h264_dpb_perform_memory_management_control_operation (priv->dpb,
ref_pic_marking, picture)) {
GST_WARNING_OBJECT (self, "memory management operation type %d failed",
type);
return FALSE;
}
}
return TRUE;
}
static gboolean
gst_h264_decoder_sliding_window_picture_marking (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
const GstH264SPS *sps = priv->active_sps;
gint num_ref_pics;
gint max_num_ref_frames;
if (!sps) {
GST_ERROR_OBJECT (self, "No active sps");
return FALSE;
}
/* 8.2.5.3. Ensure the DPB doesn't overflow by discarding the oldest picture */
num_ref_pics = gst_h264_dpb_num_ref_pictures (priv->dpb);
max_num_ref_frames = MAX (1, sps->num_ref_frames);
if (num_ref_pics > max_num_ref_frames) {
GST_WARNING_OBJECT (self,
"num_ref_pics %d is larger than allowed maximum %d",
num_ref_pics, max_num_ref_frames);
return FALSE;
}
if (num_ref_pics == max_num_ref_frames) {
/* Max number of reference pics reached, need to remove one of the short
* term ones. Find smallest frame_num_wrap short reference picture and mark
* it as unused */
GstH264Picture *to_unmark =
gst_h264_dpb_get_lowest_frame_num_short_ref (priv->dpb);
if (!to_unmark) {
GST_WARNING_OBJECT (self, "Could not find a short ref picture to unmark");
return FALSE;
}
GST_TRACE_OBJECT (self,
"Unmark reference flag of picture %p (frame_num %d, poc %d)",
to_unmark, to_unmark->frame_num, to_unmark->pic_order_cnt);
to_unmark->ref = FALSE;
gst_h264_picture_unref (to_unmark);
}
return TRUE;
}
/* This method ensures that DPB does not overflow, either by removing
* reference pictures as specified in the stream, or using a sliding window
* procedure to remove the oldest one.
* It also performs marking and unmarking pictures as reference.
* See spac 8.2.5.1 */
static gboolean
gst_h264_decoder_reference_picture_marking (GstH264Decoder * self,
GstH264Picture * picture)
{
GstH264DecoderPrivate *priv = self->priv;
/* If the current picture is an IDR, all reference pictures are unmarked */
if (picture->idr) {
gst_h264_dpb_mark_all_non_ref (priv->dpb);
if (picture->dec_ref_pic_marking.long_term_reference_flag) {
picture->long_term = TRUE;
picture->long_term_frame_idx = 0;
priv->max_long_term_frame_idx = 0;
} else {
picture->long_term = FALSE;
priv->max_long_term_frame_idx = -1;
}
return TRUE;
}
/* Not an IDR. If the stream contains instructions on how to discard pictures
* from DPB and how to mark/unmark existing reference pictures, do so.
* Otherwise, fall back to default sliding window process */
if (picture->dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag) {
if (picture->nonexisting) {
GST_WARNING_OBJECT (self,
"Invalid memory management operation for non-existing picture "
"%p (frame_num %d, poc %d", picture, picture->frame_num,
picture->pic_order_cnt);
}
return gst_h264_decoder_handle_memory_management_opt (self, picture);
}
return gst_h264_decoder_sliding_window_picture_marking (self);
}
static gboolean
gst_h264_decoder_finish_picture (GstH264Decoder * self,
GstH264Picture * picture)
{
GstH264DecoderPrivate *priv = self->priv;
/* Finish processing the picture.
* Start by storing previous picture data for later use */
if (picture->ref) {
gst_h264_decoder_reference_picture_marking (self, picture);
priv->prev_ref_has_memmgmnt5 = picture->mem_mgmt_5;
priv->prev_ref_top_field_order_cnt = picture->top_field_order_cnt;
priv->prev_ref_pic_order_cnt_msb = picture->pic_order_cnt_msb;
priv->prev_ref_pic_order_cnt_lsb = picture->pic_order_cnt_lsb;
priv->prev_ref_field = picture->field;
priv->prev_ref_frame_num = picture->frame_num;
}
priv->prev_frame_num = picture->frame_num;
priv->prev_has_memmgmnt5 = picture->mem_mgmt_5;
priv->prev_frame_num_offset = picture->frame_num_offset;
/* Remove unused (for reference or later output) pictures from DPB, marking
* them as such */
gst_h264_dpb_delete_unused (priv->dpb);
gst_h264_dpb_add (priv->dpb, picture);
GST_LOG_OBJECT (self,
"Finishing picture %p (frame_num %d, poc %d), entries in DPB %d",
picture, picture->frame_num, picture->pic_order_cnt,
gst_h264_dpb_get_size (priv->dpb));
while (gst_h264_dpb_needs_bump (priv->dpb, priv->max_num_reorder_frames,
priv->is_live)) {
GstH264Picture *to_output;
to_output = gst_h264_dpb_bump (priv->dpb, FALSE);
if (!to_output) {
GST_WARNING_OBJECT (self, "Bumping is needed but no picture to output");
break;
}
gst_h264_decoder_do_output_picture (self, to_output);
}
return TRUE;
}
static gboolean
gst_h264_decoder_update_max_num_reorder_frames (GstH264Decoder * self,
GstH264SPS * sps)
{
GstH264DecoderPrivate *priv = self->priv;
if (sps->vui_parameters_present_flag
&& sps->vui_parameters.bitstream_restriction_flag) {
priv->max_num_reorder_frames = sps->vui_parameters.num_reorder_frames;
if (priv->max_num_reorder_frames >
gst_h264_dpb_get_max_num_pics (priv->dpb)) {
GST_WARNING
("max_num_reorder_frames present, but larger than MaxDpbFrames (%d > %d)",
(gint) priv->max_num_reorder_frames,
gst_h264_dpb_get_max_num_pics (priv->dpb));
priv->max_num_reorder_frames = 0;
return FALSE;
}
return TRUE;
}
/* max_num_reorder_frames not present, infer from profile/constraints
* (see VUI semantics in spec) */
if (sps->constraint_set3_flag) {
switch (sps->profile_idc) {
case 44:
case 86:
case 100:
case 110:
case 122:
case 244:
priv->max_num_reorder_frames = 0;
break;
default:
priv->max_num_reorder_frames =
gst_h264_dpb_get_max_num_pics (priv->dpb);
break;
}
} else {
priv->max_num_reorder_frames = gst_h264_dpb_get_max_num_pics (priv->dpb);
}
return TRUE;
}
typedef enum
{
GST_H264_LEVEL_L1 = 10,
GST_H264_LEVEL_L1B = 9,
GST_H264_LEVEL_L1_1 = 11,
GST_H264_LEVEL_L1_2 = 12,
GST_H264_LEVEL_L1_3 = 13,
GST_H264_LEVEL_L2_0 = 20,
GST_H264_LEVEL_L2_1 = 21,
GST_H264_LEVEL_L2_2 = 22,
GST_H264_LEVEL_L3 = 30,
GST_H264_LEVEL_L3_1 = 31,
GST_H264_LEVEL_L3_2 = 32,
GST_H264_LEVEL_L4 = 40,
GST_H264_LEVEL_L4_1 = 41,
GST_H264_LEVEL_L4_2 = 42,
GST_H264_LEVEL_L5 = 50,
GST_H264_LEVEL_L5_1 = 51,
GST_H264_LEVEL_L5_2 = 52,
GST_H264_LEVEL_L6 = 60,
GST_H264_LEVEL_L6_1 = 61,
GST_H264_LEVEL_L6_2 = 62,
} GstH264DecoderLevel;
typedef struct
{
GstH264DecoderLevel level;
guint32 max_mbps;
guint32 max_fs;
guint32 max_dpb_mbs;
guint32 max_main_br;
} LevelLimits;
static const LevelLimits level_limits_map[] = {
{GST_H264_LEVEL_L1, 1485, 99, 396, 64},
{GST_H264_LEVEL_L1B, 1485, 99, 396, 128},
{GST_H264_LEVEL_L1_1, 3000, 396, 900, 192},
{GST_H264_LEVEL_L1_2, 6000, 396, 2376, 384},
{GST_H264_LEVEL_L1_3, 11800, 396, 2376, 768},
{GST_H264_LEVEL_L2_0, 11880, 396, 2376, 2000},
{GST_H264_LEVEL_L2_1, 19800, 792, 4752, 4000},
{GST_H264_LEVEL_L2_2, 20250, 1620, 8100, 4000},
{GST_H264_LEVEL_L3, 40500, 1620, 8100, 10000},
{GST_H264_LEVEL_L3_1, 108000, 3600, 18000, 14000},
{GST_H264_LEVEL_L3_2, 216000, 5120, 20480, 20000},
{GST_H264_LEVEL_L4, 245760, 8192, 32768, 20000},
{GST_H264_LEVEL_L4_1, 245760, 8192, 32768, 50000},
{GST_H264_LEVEL_L4_2, 522240, 8704, 34816, 50000},
{GST_H264_LEVEL_L5, 589824, 22080, 110400, 135000},
{GST_H264_LEVEL_L5_1, 983040, 36864, 184320, 240000},
{GST_H264_LEVEL_L5_2, 2073600, 36864, 184320, 240000},
{GST_H264_LEVEL_L6, 4177920, 139264, 696320, 240000},
{GST_H264_LEVEL_L6_1, 8355840, 139264, 696320, 480000},
{GST_H264_LEVEL_L6_2, 16711680, 139264, 696320, 800000}
};
static gint
h264_level_to_max_dpb_mbs (GstH264DecoderLevel level)
{
gint i;
for (i = 0; i < G_N_ELEMENTS (level_limits_map); i++) {
if (level == level_limits_map[i].level)
return level_limits_map[i].max_dpb_mbs;
}
return 0;
}
static void
gst_h264_decoder_set_latency (GstH264Decoder * self, const GstH264SPS * sps,
gint max_dpb_size)
{
GstH264DecoderPrivate *priv = self->priv;
GstCaps *caps;
GstClockTime min, max;
GstStructure *structure;
gint fps_d = 1, fps_n = 0;
guint32 num_reorder_frames;
caps = gst_pad_get_current_caps (GST_VIDEO_DECODER_SRC_PAD (self));
if (!caps)
return;
structure = gst_caps_get_structure (caps, 0);
if (gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d)) {
if (fps_n == 0) {
/* variable framerate: see if we have a max-framerate */
gst_structure_get_fraction (structure, "max-framerate", &fps_n, &fps_d);
}
}
gst_caps_unref (caps);
/* if no fps or variable, then 25/1 */
if (fps_n == 0) {
fps_n = 25;
fps_d = 1;
}
num_reorder_frames = priv->is_live ? 0 : 1;
if (sps->vui_parameters_present_flag
&& sps->vui_parameters.bitstream_restriction_flag)
num_reorder_frames = sps->vui_parameters.num_reorder_frames;
if (num_reorder_frames > max_dpb_size)
num_reorder_frames = priv->is_live ? 0 : 1;
min = gst_util_uint64_scale_int (num_reorder_frames * GST_SECOND, fps_d,
fps_n);
max = gst_util_uint64_scale_int (max_dpb_size * GST_SECOND, fps_d, fps_n);
GST_LOG_OBJECT (self,
"latency min %" G_GUINT64_FORMAT " max %" G_GUINT64_FORMAT, min, max);
gst_video_decoder_set_latency (GST_VIDEO_DECODER (self), min, max);
}
static gboolean
gst_h264_decoder_process_sps (GstH264Decoder * self, GstH264SPS * sps)
{
GstH264DecoderPrivate *priv = self->priv;
guint8 level;
gint max_dpb_mbs;
gint width_mb, height_mb;
gint max_dpb_frames;
gint max_dpb_size;
gint prev_max_dpb_size;
if (sps->frame_mbs_only_flag == 0) {
GST_FIXME_OBJECT (self, "frame_mbs_only_flag != 1 not supported");
return FALSE;
}
/* Spec A.3.1 and A.3.2
* For Baseline, Constrained Baseline and Main profile, the indicated level is
* Level 1b if level_idc is equal to 11 and constraint_set3_flag is equal to 1
*/
level = sps->level_idc;
if (level == 11 && (sps->profile_idc == 66 || sps->profile_idc == 77) &&
sps->constraint_set3_flag) {
/* Level 1b */
level = 9;
}
max_dpb_mbs = h264_level_to_max_dpb_mbs ((GstH264DecoderLevel) level);
if (!max_dpb_mbs)
return FALSE;
width_mb = sps->width / 16;
height_mb = sps->height / 16;
max_dpb_frames = MIN (max_dpb_mbs / (width_mb * height_mb),
GST_H264_DPB_MAX_SIZE);
if (sps->vui_parameters_present_flag
&& sps->vui_parameters.bitstream_restriction_flag)
max_dpb_frames = MAX (1, sps->vui_parameters.max_dec_frame_buffering);
/* Case 1) There might be some non-conforming streams that require more DPB
* size than that of specified one by SPS
* Case 2) If bitstream_restriction_flag is not present,
* max_dec_frame_buffering should be inferred
* to be equal to MaxDpbFrames, then MaxDpbFrames can exceed num_ref_frames
* See https://chromium-review.googlesource.com/c/chromium/src/+/760276/
*/
max_dpb_size = MAX (max_dpb_frames, sps->num_ref_frames);
if (max_dpb_size > GST_H264_DPB_MAX_SIZE) {
GST_WARNING_OBJECT (self, "Too large calculated DPB size %d", max_dpb_size);
max_dpb_size = GST_H264_DPB_MAX_SIZE;
}
/* Safety, so that subclass don't need bound checking */
g_return_val_if_fail (max_dpb_size <= GST_H264_DPB_MAX_SIZE, FALSE);
prev_max_dpb_size = gst_h264_dpb_get_max_num_pics (priv->dpb);
if (priv->width != sps->width || priv->height != sps->height ||
prev_max_dpb_size != max_dpb_size) {
GstH264DecoderClass *klass = GST_H264_DECODER_GET_CLASS (self);
GST_DEBUG_OBJECT (self,
"SPS updated, resolution: %dx%d -> %dx%d, dpb size: %d -> %d",
priv->width, priv->height, sps->width, sps->height,
prev_max_dpb_size, max_dpb_size);
if (gst_h264_decoder_drain (GST_VIDEO_DECODER (self)) != GST_FLOW_OK)
return FALSE;
g_assert (klass->new_sequence);
if (!klass->new_sequence (self, sps, max_dpb_size)) {
GST_ERROR_OBJECT (self, "subclass does not want accept new sequence");
return FALSE;
}
priv->width = sps->width;
priv->height = sps->height;
gst_h264_decoder_set_latency (self, sps, max_dpb_size);
gst_h264_dpb_set_max_num_pics (priv->dpb, max_dpb_size);
}
GST_DEBUG_OBJECT (self, "Set DPB max size %d", max_dpb_size);
return gst_h264_decoder_update_max_num_reorder_frames (self, sps);
}
static gboolean
gst_h264_decoder_init_gap_picture (GstH264Decoder * self,
GstH264Picture * picture, gint frame_num)
{
picture->nonexisting = TRUE;
picture->nal_ref_idc = 1;
picture->frame_num = picture->pic_num = frame_num;
picture->dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag = FALSE;
picture->ref = TRUE;
picture->dec_ref_pic_marking.long_term_reference_flag = FALSE;
picture->field = GST_H264_PICTURE_FIELD_FRAME;
return gst_h264_decoder_calculate_poc (self, picture);
}
static gboolean
gst_h264_decoder_decode_slice (GstH264Decoder * self)
{
GstH264DecoderClass *klass = GST_H264_DECODER_GET_CLASS (self);
GstH264DecoderPrivate *priv = self->priv;
GstH264Slice *slice = &priv->current_slice;
GstH264Picture *picture = priv->current_picture;
GArray *ref_pic_list0 = NULL;
GArray *ref_pic_list1 = NULL;
gboolean ret = FALSE;
if (!picture) {
GST_ERROR_OBJECT (self, "No current picture");
return FALSE;
}
GST_LOG_OBJECT (self, "Decode picture %p (frame_num %d, poc %d)",
picture, picture->frame_num, picture->pic_order_cnt);
priv->max_pic_num = slice->header.max_pic_num;
if (priv->process_ref_pic_lists) {
if (!gst_h264_decoder_modify_ref_pic_lists (self))
goto beach;
ref_pic_list0 = priv->ref_pic_list0;
ref_pic_list1 = priv->ref_pic_list1;
}
g_assert (klass->decode_slice);
ret = klass->decode_slice (self, picture, slice, ref_pic_list0,
ref_pic_list1);
if (!ret) {
GST_WARNING_OBJECT (self,
"Subclass didn't want to decode picture %p (frame_num %d, poc %d)",
picture, picture->frame_num, picture->pic_order_cnt);
}
beach:
g_array_set_size (priv->ref_pic_list0, 0);
g_array_set_size (priv->ref_pic_list1, 0);
return ret;
}
static gint
pic_num_desc_compare (const GstH264Picture ** a, const GstH264Picture ** b)
{
return (*b)->pic_num - (*a)->pic_num;
}
static gint
long_term_pic_num_asc_compare (const GstH264Picture ** a,
const GstH264Picture ** b)
{
return (*a)->long_term_pic_num - (*b)->long_term_pic_num;
}
static void
construct_ref_pic_lists_p (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
gint pos;
/* RefPicList0 (8.2.4.2.1) [[1] [2]], where:
* [1] shortterm ref pics sorted by descending pic_num,
* [2] longterm ref pics by ascending long_term_pic_num.
*/
g_array_set_size (priv->ref_pic_list_p0, 0);
gst_h264_dpb_get_pictures_short_term_ref (priv->dpb, priv->ref_pic_list_p0);
g_array_sort (priv->ref_pic_list_p0, (GCompareFunc) pic_num_desc_compare);
pos = priv->ref_pic_list_p0->len;
gst_h264_dpb_get_pictures_long_term_ref (priv->dpb, priv->ref_pic_list_p0);
g_qsort_with_data (&g_array_index (priv->ref_pic_list_p0, gpointer, pos),
priv->ref_pic_list_p0->len - pos, sizeof (gpointer),
(GCompareDataFunc) long_term_pic_num_asc_compare, NULL);
#ifndef GST_DISABLE_GST_DEBUG
if (gst_debug_category_get_threshold (GST_CAT_DEFAULT) >= GST_LEVEL_DEBUG) {
GString *str = g_string_new (NULL);
for (pos = 0; pos < priv->ref_pic_list_p0->len; pos++) {
GstH264Picture *ref =
g_array_index (priv->ref_pic_list_p0, GstH264Picture *, pos);
if (!ref->long_term)
g_string_append_printf (str, "|%i", ref->pic_num);
else
g_string_append_printf (str, "|%is", ref->pic_num);
}
GST_DEBUG_OBJECT (self, "ref_pic_list_p0: %s|", str->str);
g_string_free (str, TRUE);
}
#endif
}
static gboolean
lists_are_equal (GArray * l1, GArray * l2)
{
gint i;
if (l1->len != l2->len)
return FALSE;
for (i = 0; i < l1->len; i++)
if (g_array_index (l1, gpointer, i) != g_array_index (l2, gpointer, i))
return FALSE;
return TRUE;
}
static gint
split_ref_pic_list_b (GstH264Decoder * self, GArray * ref_pic_list_b,
GCompareFunc compare_func)
{
gint pos;
for (pos = 0; pos < ref_pic_list_b->len; pos++) {
GstH264Picture *pic = g_array_index (ref_pic_list_b, GstH264Picture *, pos);
if (compare_func (&pic, &self->priv->current_picture) > 0)
break;
}
return pos;
}
static void
print_ref_pic_list_b (GstH264Decoder * self, GArray * ref_list_b, gint index)
{
#ifndef GST_DISABLE_GST_DEBUG
GString *str;
gint i;
if (gst_debug_category_get_threshold (GST_CAT_DEFAULT) < GST_LEVEL_DEBUG)
return;
str = g_string_new (NULL);
for (i = 0; i < ref_list_b->len; i++) {
GstH264Picture *ref = g_array_index (ref_list_b, GstH264Picture *, i);
if (!ref->long_term)
g_string_append_printf (str, "|%i", ref->pic_order_cnt);
else
g_string_append_printf (str, "|%il", ref->long_term_pic_num);
}
GST_DEBUG_OBJECT (self, "ref_pic_list_b%i: %s| curr %i", index, str->str,
self->priv->current_picture->pic_order_cnt);
g_string_free (str, TRUE);
#endif
}
static void
construct_ref_pic_lists_b (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
gint pos;
/* RefPicList0 (8.2.4.2.3) [[1] [2] [3]], where:
* [1] shortterm ref pics with POC < current_picture's POC sorted by descending POC,
* [2] shortterm ref pics with POC > current_picture's POC by ascending POC,
* [3] longterm ref pics by ascending long_term_pic_num.
*/
g_array_set_size (priv->ref_pic_list_b0, 0);
g_array_set_size (priv->ref_pic_list_b1, 0);
gst_h264_dpb_get_pictures_short_term_ref (priv->dpb, priv->ref_pic_list_b0);
/* First sort ascending, this will put [1] in right place and finish
* [2]. */
print_ref_pic_list_b (self, priv->ref_pic_list_b0, 0);
g_array_sort (priv->ref_pic_list_b0, (GCompareFunc) poc_asc_compare);
print_ref_pic_list_b (self, priv->ref_pic_list_b0, 0);
/* Find first with POC > current_picture's POC to get first element
* in [2]... */
pos = split_ref_pic_list_b (self, priv->ref_pic_list_b0,
(GCompareFunc) poc_asc_compare);
GST_DEBUG_OBJECT (self, "split point %i", pos);
/* and sort [1] descending, thus finishing sequence [1] [2]. */
g_qsort_with_data (priv->ref_pic_list_b0->data, pos, sizeof (gpointer),
(GCompareDataFunc) poc_desc_compare, NULL);
/* Now add [3] and sort by ascending long_term_pic_num. */
pos = priv->ref_pic_list_b0->len;
gst_h264_dpb_get_pictures_long_term_ref (priv->dpb, priv->ref_pic_list_b0);
g_qsort_with_data (&g_array_index (priv->ref_pic_list_b0, gpointer, pos),
priv->ref_pic_list_b0->len - pos, sizeof (gpointer),
(GCompareDataFunc) long_term_pic_num_asc_compare, NULL);
/* RefPicList1 (8.2.4.2.4) [[1] [2] [3]], where:
* [1] shortterm ref pics with POC > curr_pic's POC sorted by ascending POC,
* [2] shortterm ref pics with POC < curr_pic's POC by descending POC,
* [3] longterm ref pics by ascending long_term_pic_num.
*/
gst_h264_dpb_get_pictures_short_term_ref (priv->dpb, priv->ref_pic_list_b1);
/* First sort by descending POC. */
g_array_sort (priv->ref_pic_list_b1, (GCompareFunc) poc_desc_compare);
/* Split at first with POC < current_picture's POC to get first element
* in [2]... */
pos = split_ref_pic_list_b (self, priv->ref_pic_list_b1,
(GCompareFunc) poc_desc_compare);
/* and sort [1] ascending. */
g_qsort_with_data (priv->ref_pic_list_b1->data, pos, sizeof (gpointer),
(GCompareDataFunc) poc_asc_compare, NULL);
/* Now add [3] and sort by ascending long_term_pic_num */
pos = priv->ref_pic_list_b1->len;
gst_h264_dpb_get_pictures_long_term_ref (priv->dpb, priv->ref_pic_list_b1);
g_qsort_with_data (&g_array_index (priv->ref_pic_list_b1, gpointer, pos),
priv->ref_pic_list_b1->len - pos, sizeof (gpointer),
(GCompareDataFunc) long_term_pic_num_asc_compare, NULL);
/* If lists identical, swap first two entries in RefPicList1 (spec
* 8.2.4.2.3) */
if (priv->ref_pic_list_b1->len > 1
&& lists_are_equal (priv->ref_pic_list_b0, priv->ref_pic_list_b1)) {
/* swap */
GstH264Picture **list = (GstH264Picture **) priv->ref_pic_list_b1->data;
GstH264Picture *pic = list[0];
list[0] = list[1];
list[1] = pic;
}
print_ref_pic_list_b (self, priv->ref_pic_list_b0, 0);
print_ref_pic_list_b (self, priv->ref_pic_list_b1, 1);
}
static void
gst_h264_decoder_prepare_ref_pic_lists (GstH264Decoder * self)
{
construct_ref_pic_lists_p (self);
construct_ref_pic_lists_b (self);
}
static void
gst_h264_decoder_clear_ref_pic_lists (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
g_array_set_size (priv->ref_pic_list_p0, 0);
g_array_set_size (priv->ref_pic_list_b0, 0);
g_array_set_size (priv->ref_pic_list_b1, 0);
}
static gint
long_term_pic_num_f (GstH264Decoder * self, const GstH264Picture * picture)
{
if (picture->ref && picture->long_term)
return picture->long_term_pic_num;
return 2 * (self->priv->max_long_term_frame_idx + 1);
}
static gint
pic_num_f (GstH264Decoder * self, const GstH264Picture * picture)
{
if (!picture->long_term)
return picture->pic_num;
return self->priv->max_pic_num;
}
/* shift elements on the |array| starting from |from| to |to|,
* inclusive, one position to the right and insert pic at |from| */
static void
shift_right_and_insert (GArray * array, gint from, gint to,
GstH264Picture * picture)
{
g_return_if_fail (from <= to);
g_return_if_fail (array && picture);
g_array_set_size (array, to + 2);
g_array_insert_val (array, from, picture);
}
/* This can process either ref_pic_list0 or ref_pic_list1, depending
* on the list argument. Set up pointers to proper list to be
* processed here. */
static gboolean
modify_ref_pic_list (GstH264Decoder * self, int list)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264Picture *picture = priv->current_picture;
GArray *ref_pic_listx;
const GstH264SliceHdr *slice_hdr = &priv->current_slice.header;
const GstH264RefPicListModification *list_mod;
gboolean ref_pic_list_modification_flag_lX;
gint num_ref_idx_lX_active_minus1;
guint num_ref_pic_list_modifications;
gint i;
gint pic_num_lx_pred = picture->pic_num;
gint ref_idx_lx = 0, src, dst;
gint pic_num_lx_no_wrap;
gint pic_num_lx;
gboolean done = FALSE;
GstH264Picture *pic;
if (list == 0) {
ref_pic_listx = priv->ref_pic_list0;
ref_pic_list_modification_flag_lX =
slice_hdr->ref_pic_list_modification_flag_l0;
num_ref_pic_list_modifications = slice_hdr->n_ref_pic_list_modification_l0;
num_ref_idx_lX_active_minus1 = slice_hdr->num_ref_idx_l0_active_minus1;
list_mod = slice_hdr->ref_pic_list_modification_l0;
} else {
ref_pic_listx = priv->ref_pic_list1;
ref_pic_list_modification_flag_lX =
slice_hdr->ref_pic_list_modification_flag_l1;
num_ref_pic_list_modifications = slice_hdr->n_ref_pic_list_modification_l1;
num_ref_idx_lX_active_minus1 = slice_hdr->num_ref_idx_l1_active_minus1;
list_mod = slice_hdr->ref_pic_list_modification_l1;
}
/* Resize the list to the size requested in the slice header.
*
* Note that per 8.2.4.2 it's possible for
* num_ref_idx_lX_active_minus1 to indicate there should be more ref
* pics on list than we constructed. Those superfluous ones should
* be treated as non-reference and will be initialized to null,
* which must be handled by clients */
g_assert (num_ref_idx_lX_active_minus1 >= 0);
if (ref_pic_listx->len > num_ref_idx_lX_active_minus1 + 1)
g_array_set_size (ref_pic_listx, num_ref_idx_lX_active_minus1 + 1);
if (!ref_pic_list_modification_flag_lX)
return TRUE;
/* Spec 8.2.4.3:
* Reorder pictures on the list in a way specified in the stream. */
for (i = 0; i < num_ref_pic_list_modifications && !done; i++) {
switch (list_mod->modification_of_pic_nums_idc) {
/* 8.2.4.3.1 - Modify short reference picture position. */
case 0:
case 1:
/* 8-34 */
if (list_mod->modification_of_pic_nums_idc == 0) {
/* Substract given value from predicted PicNum. */
pic_num_lx_no_wrap = pic_num_lx_pred -
(list_mod->value.abs_diff_pic_num_minus1 + 1);
/* Wrap around max_pic_num if it becomes < 0 as result of
* subtraction */
if (pic_num_lx_no_wrap < 0)
pic_num_lx_no_wrap += priv->max_pic_num;
} else { /* 8-35 */
/* Add given value to predicted PicNum. */
pic_num_lx_no_wrap = pic_num_lx_pred +
(list_mod->value.abs_diff_pic_num_minus1 + 1);
/* Wrap around max_pic_num if it becomes >= max_pic_num as
* result of the addition */
if (pic_num_lx_no_wrap >= priv->max_pic_num)
pic_num_lx_no_wrap -= priv->max_pic_num;
}
/* For use in next iteration */
pic_num_lx_pred = pic_num_lx_no_wrap;
/* 8-36 */
if (pic_num_lx_no_wrap > picture->pic_num)
pic_num_lx = pic_num_lx_no_wrap - priv->max_pic_num;
else
pic_num_lx = pic_num_lx_no_wrap;
/* 8-37 */
g_assert (num_ref_idx_lX_active_minus1 + 1 < 32);
pic = gst_h264_dpb_get_short_ref_by_pic_num (priv->dpb, pic_num_lx);
if (!pic) {
GST_WARNING_OBJECT (self, "Malformed stream, no pic num %d",
pic_num_lx);
return FALSE;
}
shift_right_and_insert (ref_pic_listx, ref_idx_lx,
num_ref_idx_lX_active_minus1, pic);
ref_idx_lx++;
for (src = ref_idx_lx, dst = ref_idx_lx;
src <= num_ref_idx_lX_active_minus1 + 1; src++) {
GstH264Picture *src_pic =
g_array_index (ref_pic_listx, GstH264Picture *, src);
gint src_pic_num_lx = src_pic ? pic_num_f (self, src_pic) : -1;
if (src_pic_num_lx != pic_num_lx)
g_array_index (ref_pic_listx, GstH264Picture *, dst++) = src_pic;
}
break;
/* 8.2.4.3.2 - Long-term reference pictures */
case 2:
/* (8-28) */
g_assert (num_ref_idx_lX_active_minus1 + 1 < 32);
pic = gst_h264_dpb_get_long_ref_by_long_term_pic_num (priv->dpb,
list_mod->value.long_term_pic_num);
if (!pic) {
GST_WARNING_OBJECT (self, "Malformed stream, no pic num %d",
list_mod->value.long_term_pic_num);
return FALSE;
}
shift_right_and_insert (ref_pic_listx, ref_idx_lx,
num_ref_idx_lX_active_minus1, pic);
ref_idx_lx++;
for (src = ref_idx_lx, dst = ref_idx_lx;
src <= num_ref_idx_lX_active_minus1 + 1; src++) {
GstH264Picture *src_pic =
g_array_index (ref_pic_listx, GstH264Picture *, src);
if (long_term_pic_num_f (self, src_pic) !=
list_mod->value.long_term_pic_num)
g_array_index (ref_pic_listx, GstH264Picture *, dst++) = src_pic;
}
break;
/* End of modification list */
case 3:
done = TRUE;
break;
default:
/* may be recoverable */
GST_WARNING ("Invalid modification_of_pic_nums_idc = %d",
list_mod->modification_of_pic_nums_idc);
break;
}
list_mod++;
}
/* Per NOTE 2 in 8.2.4.3.2, the ref_pic_listx in the above loop is
* temporarily made one element longer than the required final list.
* Resize the list back to its required size. */
if (ref_pic_listx->len > num_ref_idx_lX_active_minus1 + 1)
g_array_set_size (ref_pic_listx, num_ref_idx_lX_active_minus1 + 1);
return TRUE;
}
static void
copy_pic_list_into (GArray * dest, GArray * src)
{
gint i;
g_array_set_size (dest, 0);
for (i = 0; i < src->len; i++)
g_array_append_val (dest, g_array_index (src, gpointer, i));
}
static gboolean
gst_h264_decoder_modify_ref_pic_lists (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
GstH264SliceHdr *slice_hdr = &priv->current_slice.header;
/* fill reference picture lists for B and S/SP slices */
if (GST_H264_IS_P_SLICE (slice_hdr) || GST_H264_IS_SP_SLICE (slice_hdr)) {
copy_pic_list_into (priv->ref_pic_list0, priv->ref_pic_list_p0);
return modify_ref_pic_list (self, 0);
} else {
copy_pic_list_into (priv->ref_pic_list0, priv->ref_pic_list_b0);
copy_pic_list_into (priv->ref_pic_list1, priv->ref_pic_list_b1);
return modify_ref_pic_list (self, 0)
&& modify_ref_pic_list (self, 1);
}
return TRUE;
}
/**
* gst_h264_decoder_set_process_ref_pic_lists:
* @decoder: a #GstH264Decoder
* @process: whether subclass is requiring reference picture modification process
*
* Called to en/disable reference picture modification process.
*
* Since: 1.18
*/
void
gst_h264_decoder_set_process_ref_pic_lists (GstH264Decoder * decoder,
gboolean process)
{
decoder->priv->process_ref_pic_lists = process;
}
/**
* gst_h264_decoder_get_picture:
* @decoder: a #GstH264Decoder
* @system_frame_number: a target system frame number of #GstH264Picture
*
* Retrive DPB and return a #GstH264Picture corresponding to
* the @system_frame_number
*
* Returns: (transfer full): a #GstH264Picture if successful, or %NULL otherwise
*
* Since: 1.18
*/
GstH264Picture *
gst_h264_decoder_get_picture (GstH264Decoder * decoder,
guint32 system_frame_number)
{
return gst_h264_dpb_get_picture (decoder->priv->dpb, system_frame_number);
}
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