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gstreamer/subprojects/gst-plugins-bad/ext/closedcaption/gsth264reorder.c
Seungha Yang 6a711ede04 closedcaption: Add h264ccinserter element 
Adding new element for inserting closed caption SEI to H.264 stream

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8496>
2025-02-21 15:00:01 +00:00

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/* GStreamer
* Copyright (C) 2025 Seungha Yang <seungha@centricular.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 "gsth264reorder.h"
#include <gst/codecs/gsth264picture.h>
#include <gst/codecs/gsth264picture-private.h>
#include <gst/base/base.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_h264_reorder_debug);
#define GST_CAT_DEFAULT gst_h264_reorder_debug
struct _GstH264Reorder
{
GstObject parent;
gboolean need_reorder;
gint width;
gint height;
gint fps_n;
gint fps_d;
guint nal_length_size;
gboolean is_avc;
GstH264NalParser *parser;
GstH264Dpb *dpb;
GstH264SPS *active_sps;
GstH264PPS *active_pps;
GstH264Picture *current_picture;
GstVideoCodecFrame *current_frame;
GstH264Slice current_slice;
GstH264Picture *last_field;
gint max_frame_num;
gint max_pic_num;
gint max_long_term_frame_idx;
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;
/* Split packetized data into actual nal chunks (for malformed stream) */
GArray *split_nalu;
GArray *au_nalus;
GPtrArray *frame_queue;
GPtrArray *output_queue;
guint32 system_num;
guint32 present_num;
GstClockTime latency;
};
static void gst_h264_reorder_finalize (GObject * object);
static GstH264Picture *gst_h264_reorder_split_frame (GstH264Reorder * self,
GstH264Picture * picture);
static void gst_h264_reorder_bump_dpb (GstH264Reorder * self,
GstH264Picture * current_picture);
static void gst_h264_reorder_add_to_dpb (GstH264Reorder * self,
GstH264Picture * picture);
#define gst_h264_reorder_parent_class parent_class
G_DEFINE_TYPE (GstH264Reorder, gst_h264_reorder, GST_TYPE_OBJECT);
static void
gst_h264_reorder_class_init (GstH264ReorderClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gst_h264_reorder_finalize;
GST_DEBUG_CATEGORY_INIT (gst_h264_reorder_debug, "h264reorder", 0,
"h264reorder");
}
static void
gst_h264_reorder_init (GstH264Reorder * self)
{
self->parser = gst_h264_nal_parser_new ();
self->dpb = gst_h264_dpb_new ();
self->frame_queue =
g_ptr_array_new_with_free_func (
(GDestroyNotify) gst_video_codec_frame_unref);
self->output_queue =
g_ptr_array_new_with_free_func (
(GDestroyNotify) gst_video_codec_frame_unref);
self->split_nalu = g_array_new (FALSE, FALSE, sizeof (GstH264NalUnit));
self->au_nalus = g_array_new (FALSE, FALSE, sizeof (GstH264NalUnit));
self->fps_n = 25;
self->fps_d = 1;
}
static void
gst_h264_reorder_finalize (GObject * object)
{
GstH264Reorder *self = GST_H264_REORDER (object);
gst_h264_nal_parser_free (self->parser);
g_ptr_array_unref (self->frame_queue);
g_ptr_array_unref (self->output_queue);
g_array_unref (self->split_nalu);
g_array_unref (self->au_nalus);
gst_h264_dpb_free (self->dpb);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gint
gst_h264_reorder_get_max_num_reorder_frames (GstH264Reorder * self,
GstH264SPS * sps, gint max_dpb_size)
{
if (sps->vui_parameters_present_flag
&& sps->vui_parameters.bitstream_restriction_flag) {
if (sps->vui_parameters.num_reorder_frames > max_dpb_size) {
GST_WARNING_OBJECT (self,
"max_num_reorder_frames present, but larger than MaxDpbFrames (%d > %d)",
sps->vui_parameters.num_reorder_frames, max_dpb_size);
return max_dpb_size;
}
return sps->vui_parameters.num_reorder_frames;
} else if (sps->constraint_set3_flag) {
/* If max_num_reorder_frames is not present, if profile id is equal to
* 44, 86, 100, 110, 122, or 244 and constraint_set3_flag is equal to 1,
* max_num_reorder_frames shall be inferred to be equal to 0 */
switch (sps->profile_idc) {
case 44:
case 86:
case 100:
case 110:
case 122:
case 244:
return 0;
default:
break;
}
}
if (sps->profile_idc == 66 || sps->profile_idc == 83) {
/* baseline, constrained baseline and scalable-baseline profiles
* only contain I/P frames. */
return 0;
}
return max_dpb_size;
}
typedef struct
{
GstH264Level 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, 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 (GstH264Level 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_reorder_set_output_buffer (GstH264Reorder * self, guint frame_num)
{
gsize i, j;
for (i = 0; i < self->frame_queue->len; i++) {
GstVideoCodecFrame *frame = g_ptr_array_index (self->frame_queue, i);
if (frame->system_frame_number != frame_num)
continue;
/* Copy frame at present index to */
if (!frame->output_buffer) {
GST_LOG_OBJECT (self, "decoding order: %u, display order: %u",
frame_num, self->present_num);
frame->presentation_frame_number = self->present_num;
self->present_num++;
for (j = 0; j < self->frame_queue->len; j++) {
GstVideoCodecFrame *other_frame =
g_ptr_array_index (self->frame_queue, j);
if (other_frame->system_frame_number ==
frame->presentation_frame_number) {
frame->output_buffer = gst_buffer_ref (other_frame->input_buffer);
return;
}
}
}
break;
}
}
static void
gst_h264_reorder_output_picture (GstH264Reorder * self,
GstH264Picture * picture)
{
guint frame_num = GST_CODEC_PICTURE_FRAME_NUMBER (picture);
gst_h264_reorder_set_output_buffer (self, frame_num);
if (picture->other_field && !picture->other_field->nonexisting) {
guint other_frame_num =
GST_CODEC_PICTURE_FRAME_NUMBER (picture->other_field);
if (other_frame_num != frame_num) {
GST_LOG_OBJECT (self, "Found separate frame for second field");
gst_h264_reorder_set_output_buffer (self, other_frame_num);
}
}
gst_h264_picture_unref (picture);
/* Move completed frames to output queue */
while (self->frame_queue->len > 0) {
GstVideoCodecFrame *frame = g_ptr_array_index (self->frame_queue, 0);
if (!frame->output_buffer)
break;
frame = g_ptr_array_steal_index (self->frame_queue, 0);
g_ptr_array_add (self->output_queue, frame);
}
}
GstH264Reorder *
gst_h264_reorder_new (gboolean need_reorder)
{
GstH264Reorder *self = g_object_new (GST_TYPE_H264_REORDER, NULL);
gst_object_ref_sink (self);
self->need_reorder = need_reorder;
return self;
}
void
gst_h264_reorder_drain (GstH264Reorder * reorder)
{
GstH264Picture *picture;
while ((picture = gst_h264_dpb_bump (reorder->dpb, TRUE)) != NULL) {
gst_h264_reorder_output_picture (reorder, picture);
}
gst_clear_h264_picture (&reorder->last_field);
gst_h264_dpb_clear (reorder->dpb);
/* Frame queue should be empty or holding only current frame */
while (reorder->frame_queue->len > 0) {
GstVideoCodecFrame *frame = g_ptr_array_index (reorder->frame_queue, 0);
if (frame == reorder->current_frame)
break;
GST_WARNING_OBJECT (reorder, "Remaining frame after drain %" GST_PTR_FORMAT,
frame->input_buffer);
/* Move to output queue anyway */
frame->output_buffer = gst_buffer_ref (frame->input_buffer);
frame = g_ptr_array_steal_index (reorder->frame_queue, 0);
g_ptr_array_add (reorder->output_queue, frame);
}
/* presentation number */
if (reorder->current_frame)
reorder->present_num = reorder->current_frame->system_frame_number;
else
reorder->present_num = reorder->system_num;
}
static void
gst_h264_reorder_process_sps (GstH264Reorder * self, GstH264SPS * sps)
{
guint8 level;
gint max_dpb_mbs;
gint width_mb, height_mb;
gint max_dpb_frames;
gint max_dpb_size;
gint prev_max_dpb_size;
gint max_reorder_frames;
gint prev_max_reorder_frames;
gboolean prev_interlaced;
gboolean interlaced;
interlaced = !sps->frame_mbs_only_flag;
/* 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 ((GstH264Level) level);
max_dpb_frames = GST_H264_DPB_MAX_SIZE;
width_mb = sps->width / 16;
height_mb = sps->height / 16;
if (max_dpb_mbs > 0) {
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);
}
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;
}
prev_max_dpb_size = gst_h264_dpb_get_max_num_frames (self->dpb);
prev_interlaced = gst_h264_dpb_get_interlaced (self->dpb);
prev_max_reorder_frames = gst_h264_dpb_get_max_num_reorder_frames (self->dpb);
max_reorder_frames =
gst_h264_reorder_get_max_num_reorder_frames (self, sps, max_dpb_size);
if (self->width != sps->width || self->height != sps->height ||
prev_max_dpb_size != max_dpb_size || prev_interlaced != interlaced ||
prev_max_reorder_frames != max_reorder_frames) {
GST_DEBUG_OBJECT (self,
"SPS updated, resolution: %dx%d -> %dx%d, dpb size: %d -> %d, "
"interlaced %d -> %d, max_reorder_frames: %d -> %d",
self->width, self->height, sps->width, sps->height,
prev_max_dpb_size, max_dpb_size, prev_interlaced, interlaced,
prev_max_reorder_frames, max_reorder_frames);
gst_h264_reorder_drain (self);
self->width = sps->width;
self->height = sps->height;
gst_h264_dpb_set_max_num_frames (self->dpb, max_dpb_size);
gst_h264_dpb_set_interlaced (self->dpb, interlaced);
gst_h264_dpb_set_max_num_reorder_frames (self->dpb, max_reorder_frames);
}
self->latency = gst_util_uint64_scale_int (max_dpb_size * GST_SECOND,
self->fps_d, self->fps_n);
}
static gboolean
gst_h264_reorder_parse_sps (GstH264Reorder * self, GstH264NalUnit * nalu)
{
GstH264SPS sps;
GstH264ParserResult pres;
gboolean ret = TRUE;
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");
gst_h264_reorder_process_sps (self, &sps);
if (gst_h264_parser_update_sps (self->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_reorder_parse_pps (GstH264Reorder * self, GstH264NalUnit * nalu)
{
GstH264PPS pps;
GstH264ParserResult pres;
gboolean ret = TRUE;
pres = gst_h264_parse_pps (self->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");
pres = gst_h264_parser_update_pps (self->parser, &pps);
if (pres != 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_reorder_parse_codec_data (GstH264Reorder * self, const guint8 * data,
gsize size)
{
GstH264DecoderConfigRecord *config = NULL;
gboolean ret = TRUE;
GstH264NalUnit *nalu;
guint i;
if (gst_h264_parser_parse_decoder_config_record (self->parser, data, size,
&config) != GST_H264_PARSER_OK) {
GST_WARNING_OBJECT (self, "Failed to parse codec-data");
return FALSE;
}
self->nal_length_size = config->length_size_minus_one + 1;
for (i = 0; i < config->sps->len; i++) {
nalu = &g_array_index (config->sps, GstH264NalUnit, i);
if (nalu->type != GST_H264_NAL_SPS)
continue;
ret = gst_h264_reorder_parse_sps (self, nalu);
if (!ret) {
GST_WARNING_OBJECT (self, "Failed to parse SPS");
goto out;
}
}
for (i = 0; i < config->pps->len; i++) {
nalu = &g_array_index (config->pps, GstH264NalUnit, i);
if (nalu->type != GST_H264_NAL_PPS)
continue;
ret = gst_h264_reorder_parse_pps (self, nalu);
if (!ret) {
GST_WARNING_OBJECT (self, "Failed to parse PPS");
goto out;
}
}
out:
gst_h264_decoder_config_record_free (config);
return ret;
}
gboolean
gst_h264_reorder_set_caps (GstH264Reorder * self, GstCaps * caps,
GstClockTime * latency)
{
GstStructure *s;
const gchar *str;
const GValue *codec_data;
gboolean ret = TRUE;
gint fps_n, fps_d;
GST_DEBUG_OBJECT (self, "Set caps %" GST_PTR_FORMAT, caps);
self->nal_length_size = 4;
self->is_avc = FALSE;
s = gst_caps_get_structure (caps, 0);
str = gst_structure_get_string (s, "stream-format");
if (str && (g_strcmp0 (str, "avc") == 0 || g_strcmp0 (str, "avc3") == 0))
self->is_avc = TRUE;
if (gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d) &&
fps_n > 0 && fps_d > 0) {
self->fps_n = fps_n;
self->fps_d = fps_d;
} else {
self->fps_n = 25;
self->fps_d = 1;
}
codec_data = gst_structure_get_value (s, "codec_data");
if (codec_data && G_VALUE_TYPE (codec_data) == GST_TYPE_BUFFER) {
GstBuffer *buf = gst_value_get_buffer (codec_data);
GstMapInfo info;
if (gst_buffer_map (buf, &info, GST_MAP_READ)) {
ret = gst_h264_reorder_parse_codec_data (self, info.data, info.size);
gst_buffer_unmap (buf, &info);
} else {
GST_ERROR_OBJECT (self, "Couldn't map codec data");
ret = FALSE;
}
}
if (self->need_reorder)
*latency = self->latency;
else
*latency = 0;
return ret;
}
static gboolean
gst_h264_reorder_handle_memory_management_opt (GstH264Reorder * self,
GstH264Picture * picture)
{
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:
self->max_long_term_frame_idx =
ref_pic_marking->max_long_term_frame_idx_plus1 - 1;
break;
case 5:
self->max_long_term_frame_idx = -1;
break;
default:
break;
}
if (!gst_h264_dpb_perform_memory_management_control_operation (self->dpb,
ref_pic_marking, picture)) {
GST_WARNING_OBJECT (self, "memory management operation type %d failed",
type);
/* Most likely our implementation fault, but let's just perform
* next MMCO if any */
}
}
return TRUE;
}
static gboolean
gst_h264_reorder_sliding_window_picture_marking (GstH264Reorder * self,
GstH264Picture * picture)
{
const GstH264SPS *sps = self->active_sps;
gint num_ref_pics;
gint max_num_ref_frames;
/* Skip this for the second field */
if (picture->second_field)
return TRUE;
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_frames (self->dpb);
max_num_ref_frames = MAX (1, sps->num_ref_frames);
if (num_ref_pics < max_num_ref_frames)
return TRUE;
/* In theory, num_ref_pics shouldn't be larger than max_num_ref_frames
* but it could happen if our implementation is wrong somehow or so.
* Just try to remove reference pictures as many as possible in order to
* avoid DPB overflow.
*/
while (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 (self->dpb);
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);
}
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);
gst_h264_picture_set_reference (to_unmark, GST_H264_PICTURE_REF_NONE, TRUE);
gst_h264_picture_unref (to_unmark);
num_ref_pics--;
}
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_reorder_reference_picture_marking (GstH264Reorder * self,
GstH264Picture * picture)
{
/* If the current picture is an IDR, all reference pictures are unmarked */
if (picture->idr) {
gst_h264_dpb_mark_all_non_ref (self->dpb);
if (picture->dec_ref_pic_marking.long_term_reference_flag) {
gst_h264_picture_set_reference (picture,
GST_H264_PICTURE_REF_LONG_TERM, FALSE);
picture->long_term_frame_idx = 0;
self->max_long_term_frame_idx = 0;
} else {
gst_h264_picture_set_reference (picture,
GST_H264_PICTURE_REF_SHORT_TERM, FALSE);
self->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_reorder_handle_memory_management_opt (self, picture);
}
return gst_h264_reorder_sliding_window_picture_marking (self, picture);
}
static void
output_picture_directly (GstH264Reorder * self, GstH264Picture * picture)
{
GstH264Picture *out_pic = NULL;
if (GST_H264_PICTURE_IS_FRAME (picture)) {
g_assert (self->last_field == NULL);
out_pic = g_steal_pointer (&picture);
goto output;
}
if (self->last_field == NULL) {
if (picture->second_field) {
GST_WARNING ("Set the last output %p poc:%d, without first field",
picture, picture->pic_order_cnt);
goto output;
}
/* Just cache the first field. */
self->last_field = g_steal_pointer (&picture);
} else {
if (!picture->second_field || !picture->other_field
|| picture->other_field != self->last_field) {
GST_WARNING ("The last field %p poc:%d is not the pair of the "
"current field %p poc:%d",
self->last_field, self->last_field->pic_order_cnt,
picture, picture->pic_order_cnt);
gst_clear_h264_picture (&self->last_field);
goto output;
}
GST_TRACE ("Pair the last field %p poc:%d and the current"
" field %p poc:%d",
self->last_field, self->last_field->pic_order_cnt,
picture, picture->pic_order_cnt);
out_pic = self->last_field;
self->last_field = NULL;
/* Link each field. */
out_pic->other_field = picture;
}
output:
if (out_pic) {
gst_h264_dpb_set_last_output (self->dpb, out_pic);
gst_h264_reorder_output_picture (self, out_pic);
}
gst_clear_h264_picture (&picture);
}
static void
gst_h264_reorder_finish_picture (GstH264Reorder * self,
GstH264Picture * picture)
{
/* Finish processing the picture.
* Start by storing previous picture data for later use */
if (picture->ref) {
gst_h264_reorder_reference_picture_marking (self, picture);
self->prev_ref_has_memmgmnt5 = picture->mem_mgmt_5;
self->prev_ref_top_field_order_cnt = picture->top_field_order_cnt;
self->prev_ref_pic_order_cnt_msb = picture->pic_order_cnt_msb;
self->prev_ref_pic_order_cnt_lsb = picture->pic_order_cnt_lsb;
self->prev_ref_field = picture->field;
self->prev_ref_frame_num = picture->frame_num;
}
self->prev_frame_num = picture->frame_num;
self->prev_has_memmgmnt5 = picture->mem_mgmt_5;
self->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 (self->dpb);
/* C.4.4 */
if (picture->mem_mgmt_5) {
GST_TRACE_OBJECT (self, "Memory management type 5, drain the DPB");
gst_h264_reorder_drain (self);
}
gst_h264_reorder_bump_dpb (self, picture);
/* Add a ref to avoid the case of directly outputed and destroyed. */
gst_h264_picture_ref (picture);
/* C.4.5.1, C.4.5.2
- If the current decoded picture is the second field of a complementary
reference field pair, add to DPB.
C.4.5.1
For A reference decoded picture, the "bumping" process is invoked
repeatedly until there is an empty frame buffer, then add to DPB:
C.4.5.2
For a non-reference decoded picture, if there is empty frame buffer
after bumping the smaller POC, add to DPB.
Otherwise, output directly. */
if ((picture->second_field && picture->other_field
&& picture->other_field->ref)
|| picture->ref || gst_h264_dpb_has_empty_frame_buffer (self->dpb)) {
/* Split frame into top/bottom field pictures for reference picture marking
* process. Even if current picture has field_pic_flag equal to zero,
* if next picture is a field picture, complementary field pair of reference
* frame should have individual pic_num and long_term_pic_num.
*/
if (gst_h264_dpb_get_interlaced (self->dpb) &&
GST_H264_PICTURE_IS_FRAME (picture)) {
GstH264Picture *other_field =
gst_h264_reorder_split_frame (self, picture);
gst_h264_reorder_add_to_dpb (self, picture);
if (!other_field) {
GST_WARNING_OBJECT (self,
"Couldn't split frame into complementary field pair");
/* Keep decoding anyway... */
} else {
gst_h264_reorder_add_to_dpb (self, other_field);
}
} else {
gst_h264_reorder_add_to_dpb (self, picture);
}
} else {
output_picture_directly (self, 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 (self->dpb));
gst_h264_picture_unref (picture);
}
static void
gst_h264_reorder_finish_current_picture (GstH264Reorder * self)
{
gst_h264_reorder_finish_picture (self, self->current_picture);
self->current_picture = NULL;
}
static gboolean
gst_h264_reorder_find_first_field_picture (GstH264Reorder * self,
GstH264Slice * slice, GstH264Picture ** first_field)
{
const GstH264SliceHdr *slice_hdr = &slice->header;
GstH264Picture *prev_field;
gboolean in_dpb;
*first_field = NULL;
prev_field = NULL;
in_dpb = FALSE;
if (gst_h264_dpb_get_interlaced (self->dpb)) {
if (self->last_field) {
prev_field = self->last_field;
in_dpb = FALSE;
} else if (gst_h264_dpb_get_size (self->dpb) > 0) {
GstH264Picture *prev_picture;
GArray *pictures;
pictures = gst_h264_dpb_get_pictures_all (self->dpb);
prev_picture =
g_array_index (pictures, GstH264Picture *, pictures->len - 1);
g_array_unref (pictures); /* prev_picture should be held */
/* Previous picture was a field picture. */
if (!GST_H264_PICTURE_IS_FRAME (prev_picture)
&& !prev_picture->other_field) {
prev_field = prev_picture;
in_dpb = TRUE;
}
}
} else {
g_assert (self->last_field == NULL);
}
/* This is not a field picture */
if (!slice_hdr->field_pic_flag) {
if (!prev_field)
return TRUE;
GST_WARNING_OBJECT (self, "Previous picture %p (poc %d) is not complete",
prev_field, prev_field->pic_order_cnt);
goto error;
}
/* OK, this is the first field. */
if (!prev_field)
return TRUE;
if (prev_field->frame_num != slice_hdr->frame_num) {
GST_WARNING_OBJECT (self, "Previous picture %p (poc %d) is not complete",
prev_field, prev_field->pic_order_cnt);
goto error;
} else {
GstH264PictureField current_field = slice_hdr->bottom_field_flag ?
GST_H264_PICTURE_FIELD_BOTTOM_FIELD : GST_H264_PICTURE_FIELD_TOP_FIELD;
if (current_field == prev_field->field) {
GST_WARNING_OBJECT (self,
"Currnet picture and previous picture have identical field %d",
current_field);
goto error;
}
}
*first_field = gst_h264_picture_ref (prev_field);
return TRUE;
error:
if (!in_dpb) {
gst_clear_h264_picture (&self->last_field);
} else {
/* FIXME: implement fill gap field picture if it is already in DPB */
}
return FALSE;
}
static gboolean
gst_h264_reorder_calculate_poc (GstH264Reorder * self, GstH264Picture * picture)
{
const GstH264SPS *sps = self->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 (self->prev_ref_has_memmgmnt5) {
if (self->prev_ref_field != GST_H264_PICTURE_FIELD_BOTTOM_FIELD) {
prev_pic_order_cnt_msb = 0;
prev_pic_order_cnt_lsb = self->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 = self->prev_ref_pic_order_cnt_msb;
prev_pic_order_cnt_lsb = self->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;
}
switch (picture->field) {
case GST_H264_PICTURE_FIELD_FRAME:
picture->top_field_order_cnt = picture->pic_order_cnt_msb +
picture->pic_order_cnt_lsb;
picture->bottom_field_order_cnt = picture->top_field_order_cnt +
picture->delta_pic_order_cnt_bottom;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
picture->top_field_order_cnt = picture->pic_order_cnt_msb +
picture->pic_order_cnt_lsb;
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
picture->bottom_field_order_cnt = picture->pic_order_cnt_msb +
picture->pic_order_cnt_lsb;
break;
}
break;
}
case 1:{
gint abs_frame_num = 0;
gint expected_pic_order_cnt = 0;
gint i;
/* See spec 8.2.1.2 */
if (self->prev_has_memmgmnt5)
self->prev_frame_num_offset = 0;
if (picture->idr)
picture->frame_num_offset = 0;
else if (self->prev_frame_num > picture->frame_num)
picture->frame_num_offset =
self->prev_frame_num_offset + self->max_frame_num;
else
picture->frame_num_offset = self->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 (GST_H264_PICTURE_IS_FRAME (picture)) {
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 (self->prev_has_memmgmnt5)
self->prev_frame_num_offset = 0;
if (picture->idr)
picture->frame_num_offset = 0;
else if (self->prev_frame_num > picture->frame_num)
picture->frame_num_offset =
self->prev_frame_num_offset + self->max_frame_num;
else
picture->frame_num_offset = self->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 (GST_H264_PICTURE_IS_FRAME (picture)) {
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 gboolean
gst_h264_reorder_init_gap_picture (GstH264Reorder * 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 = GST_H264_PICTURE_REF_SHORT_TERM;
picture->ref_pic = TRUE;
picture->dec_ref_pic_marking.long_term_reference_flag = FALSE;
picture->field = GST_H264_PICTURE_FIELD_FRAME;
return gst_h264_reorder_calculate_poc (self, picture);
}
static void
gst_h264_reorder_update_pic_nums (GstH264Reorder * self,
GstH264Picture * current_picture, gint frame_num)
{
GArray *dpb = gst_h264_dpb_get_pictures_all (self->dpb);
gint i;
for (i = 0; i < dpb->len; i++) {
GstH264Picture *picture = g_array_index (dpb, GstH264Picture *, i);
if (!GST_H264_PICTURE_IS_REF (picture))
continue;
if (GST_H264_PICTURE_IS_LONG_TERM_REF (picture)) {
if (GST_H264_PICTURE_IS_FRAME (current_picture))
picture->long_term_pic_num = picture->long_term_frame_idx;
else if (current_picture->field == picture->field)
picture->long_term_pic_num = 2 * picture->long_term_frame_idx + 1;
else
picture->long_term_pic_num = 2 * picture->long_term_frame_idx;
} else {
if (picture->frame_num > frame_num)
picture->frame_num_wrap = picture->frame_num - self->max_frame_num;
else
picture->frame_num_wrap = picture->frame_num;
if (GST_H264_PICTURE_IS_FRAME (current_picture))
picture->pic_num = picture->frame_num_wrap;
else if (picture->field == current_picture->field)
picture->pic_num = 2 * picture->frame_num_wrap + 1;
else
picture->pic_num = 2 * picture->frame_num_wrap;
}
}
g_array_unref (dpb);
}
static void
gst_h264_reorder_bump_dpb (GstH264Reorder * self,
GstH264Picture * current_picture)
{
while (gst_h264_dpb_needs_bump (self->dpb,
current_picture, GST_H264_DPB_BUMP_NORMAL_LATENCY)) {
GstH264Picture *to_output = gst_h264_dpb_bump (self->dpb, FALSE);
if (!to_output) {
GST_WARNING_OBJECT (self, "Bumping is needed but no picture to output");
break;
}
gst_h264_reorder_output_picture (self, to_output);
}
}
static GstH264Picture *
gst_h264_reorder_split_frame (GstH264Reorder * self, GstH264Picture * picture)
{
GstH264Picture *other_field;
g_assert (GST_H264_PICTURE_IS_FRAME (picture));
other_field = gst_h264_picture_new ();
other_field->other_field = picture;
other_field->second_field = TRUE;
GST_LOG_OBJECT (self, "Split picture %p, poc %d, frame num %d",
picture, picture->pic_order_cnt, picture->frame_num);
/* FIXME: enhance TFF decision by using picture timing SEI */
if (picture->top_field_order_cnt < picture->bottom_field_order_cnt) {
picture->field = GST_H264_PICTURE_FIELD_TOP_FIELD;
picture->pic_order_cnt = picture->top_field_order_cnt;
other_field->field = GST_H264_PICTURE_FIELD_BOTTOM_FIELD;
other_field->pic_order_cnt = picture->bottom_field_order_cnt;
} else {
picture->field = GST_H264_PICTURE_FIELD_BOTTOM_FIELD;
picture->pic_order_cnt = picture->bottom_field_order_cnt;
other_field->field = GST_H264_PICTURE_FIELD_TOP_FIELD;
other_field->pic_order_cnt = picture->top_field_order_cnt;
}
other_field->top_field_order_cnt = picture->top_field_order_cnt;
other_field->bottom_field_order_cnt = picture->bottom_field_order_cnt;
other_field->frame_num = picture->frame_num;
other_field->ref = picture->ref;
other_field->nonexisting = picture->nonexisting;
GST_CODEC_PICTURE_COPY_FRAME_NUMBER (other_field, picture);
other_field->field_pic_flag = picture->field_pic_flag;
return other_field;
}
static void
gst_h264_reorder_add_to_dpb (GstH264Reorder * self, GstH264Picture * picture)
{
if (!gst_h264_dpb_get_interlaced (self->dpb)) {
g_assert (self->last_field == NULL);
gst_h264_dpb_add (self->dpb, picture);
return;
}
/* The first field of the last picture may not be able to enter the
DPB if it is a non ref, but if the second field enters the DPB, we
need to add both of them. */
if (self->last_field && picture->other_field == self->last_field) {
gst_h264_dpb_add (self->dpb, self->last_field);
self->last_field = NULL;
}
gst_h264_dpb_add (self->dpb, picture);
}
static gboolean
gst_h264_reorder_handle_frame_num_gap (GstH264Reorder * self, gint frame_num)
{
const GstH264SPS *sps = self->active_sps;
gint unused_short_term_frame_num;
if (!sps) {
GST_ERROR_OBJECT (self, "No active sps");
return FALSE;
}
if (self->prev_ref_frame_num == frame_num) {
GST_TRACE_OBJECT (self,
"frame_num == PrevRefFrameNum (%d), not a gap", frame_num);
return TRUE;
}
if (((self->prev_ref_frame_num + 1) % self->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 (self->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, maybe frame drop",
frame_num);
return TRUE;
}
GST_DEBUG_OBJECT (self, "Handling frame num gap %d -> %d (MaxFrameNum: %d)",
self->prev_ref_frame_num, frame_num, self->max_frame_num);
/* 7.4.3/7-23 */
unused_short_term_frame_num =
(self->prev_ref_frame_num + 1) % self->max_frame_num;
while (unused_short_term_frame_num != frame_num) {
GstH264Picture *picture = gst_h264_picture_new ();
if (!gst_h264_reorder_init_gap_picture (self, picture,
unused_short_term_frame_num)) {
return FALSE;
}
gst_h264_reorder_update_pic_nums (self, picture,
unused_short_term_frame_num);
/* C.2.1 */
if (!gst_h264_reorder_sliding_window_picture_marking (self, picture)) {
GST_ERROR_OBJECT (self,
"Couldn't perform sliding window picture marking");
return FALSE;
}
gst_h264_dpb_delete_unused (self->dpb);
gst_h264_reorder_bump_dpb (self, picture);
/* the picture is short term ref, add to DPB. */
if (gst_h264_dpb_get_interlaced (self->dpb)) {
GstH264Picture *other_field =
gst_h264_reorder_split_frame (self, picture);
gst_h264_reorder_add_to_dpb (self, picture);
gst_h264_reorder_add_to_dpb (self, other_field);
} else {
gst_h264_reorder_add_to_dpb (self, picture);
}
unused_short_term_frame_num++;
unused_short_term_frame_num %= self->max_frame_num;
}
return TRUE;
}
static gboolean
gst_h264_reorder_fill_picture_from_slice (GstH264Reorder * 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;
picture->field_pic_flag = slice_hdr->field_pic_flag;
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;
}
picture->nal_ref_idc = slice->nalu.ref_idc;
if (slice->nalu.ref_idc != 0) {
gst_h264_picture_set_reference (picture,
GST_H264_PICTURE_REF_SHORT_TERM, FALSE);
}
picture->frame_num = slice_hdr->frame_num;
/* 7.4.3 */
if (!slice_hdr->field_pic_flag)
picture->pic_num = slice_hdr->frame_num;
else
picture->pic_num = 2 * slice_hdr->frame_num + 1;
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_reorder_init_current_picture (GstH264Reorder * self)
{
if (!gst_h264_reorder_fill_picture_from_slice (self, &self->current_slice,
self->current_picture)) {
return FALSE;
}
if (!gst_h264_reorder_calculate_poc (self, self->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 (self->current_slice.header.
dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag) {
self->current_picture->dec_ref_pic_marking =
self->current_slice.header.dec_ref_pic_marking;
}
return TRUE;
}
static gboolean
gst_h264_reorder_start_current_picture (GstH264Reorder * self)
{
const GstH264SPS *sps = self->active_sps;
GstH264Picture *current_picture = self->current_picture;
gint frame_num;
self->max_frame_num = sps->max_frame_num;
frame_num = self->current_slice.header.frame_num;
if (self->current_slice.nalu.idr_pic_flag)
self->prev_ref_frame_num = 0;
if (!gst_h264_reorder_handle_frame_num_gap (self, frame_num))
return FALSE;
if (!gst_h264_reorder_init_current_picture (self))
return FALSE;
/* If the new picture is an IDR, flush DPB */
if (current_picture->idr) {
/* Ignores no_output_of_prior_pics_flag flag here. We don't do actual
* decoding here */
gst_h264_reorder_drain (self);
}
gst_h264_reorder_update_pic_nums (self, current_picture, frame_num);
return TRUE;
}
static gboolean
gst_h264_reorder_parse_slice (GstH264Reorder * self, GstH264NalUnit * nalu)
{
GstH264ParserResult pres = GST_H264_PARSER_OK;
memset (&self->current_slice, 0, sizeof (GstH264Slice));
pres = gst_h264_parser_parse_slice_hdr (self->parser, nalu,
&self->current_slice.header, FALSE, TRUE);
if (pres != GST_H264_PARSER_OK) {
GST_ERROR_OBJECT (self, "Failed to parse slice header, ret %d", pres);
memset (&self->current_slice, 0, sizeof (GstH264Slice));
return FALSE;
}
self->current_slice.nalu = *nalu;
self->active_pps = self->current_slice.header.pps;
self->active_sps = self->active_pps->sequence;
/* Check whether field picture boundary within given codec frame.
* This might happen in case that upstream sent buffer per frame unit,
* not picture unit (i.e., AU unit).
* If AU boundary is detected, then finish first field picture we decoded
* in this chain, we should finish the current picture and
* start new field picture decoding */
if (gst_h264_dpb_get_interlaced (self->dpb) && self->current_picture &&
!GST_H264_PICTURE_IS_FRAME (self->current_picture) &&
!self->current_picture->second_field) {
GstH264PictureField prev_field = self->current_picture->field;
GstH264PictureField cur_field = GST_H264_PICTURE_FIELD_FRAME;
if (self->current_slice.header.field_pic_flag)
cur_field = self->current_slice.header.bottom_field_flag ?
GST_H264_PICTURE_FIELD_BOTTOM_FIELD :
GST_H264_PICTURE_FIELD_TOP_FIELD;
if (cur_field != prev_field) {
GST_LOG_OBJECT (self,
"Found new field picture, finishing the first field picture");
gst_h264_reorder_finish_current_picture (self);
}
}
if (!self->current_picture) {
GstH264Picture *picture = NULL;
GstH264Picture *first_field = NULL;
if (!gst_h264_reorder_find_first_field_picture (self,
&self->current_slice, &first_field)) {
GST_ERROR_OBJECT (self, "Couldn't find or determine first picture");
return FALSE;
}
picture = gst_h264_picture_new ();
if (first_field) {
picture->other_field = first_field;
picture->second_field = TRUE;
gst_h264_picture_unref (first_field);
}
/* This allows accessing the frame from the picture. */
GST_CODEC_PICTURE_FRAME_NUMBER (picture) =
self->current_frame->system_frame_number;
self->current_picture = picture;
if (!gst_h264_reorder_start_current_picture (self)) {
GST_WARNING_OBJECT (self, "start picture failed");
return FALSE;
}
}
self->max_pic_num = self->current_slice.header.max_pic_num;
return TRUE;
}
static gboolean
gst_h264_reorder_decode_nal (GstH264Reorder * 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_reorder_parse_sps (self, nalu);
break;
case GST_H264_NAL_PPS:
ret = gst_h264_reorder_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_reorder_parse_slice (self, nalu);
break;
default:
break;
}
return ret;
}
/* A53-4 Table 6.7 */
#define A53_USER_DATA_ID_GA94 0x47413934
#define A53_USER_DATA_ID_DTG1 0x44544731
/* CEA-708 Table 2 */
#define CEA_708_PROCESS_CC_DATA_FLAG 0x40
#define CEA_708_PROCESS_EM_DATA_FLAG 0x80
/* country codes */
#define ITU_T_T35_COUNTRY_CODE_UK 0xB4
#define ITU_T_T35_COUNTRY_CODE_US 0xB5
/* provider codes */
#define ITU_T_T35_MANUFACTURER_US_ATSC 0x31
#define ITU_T_T35_MANUFACTURER_US_DIRECTV 0x2F
/* custom id for SCTE 20 608 */
#define USER_DATA_ID_SCTE_20_CC 0xFFFFFFFE
/* custom id for DirecTV */
#define USER_DATA_ID_DIRECTV_CC 0xFFFFFFFF
/* A53-4 Table 6.9 */
#define A53_USER_DATA_TYPE_CODE_CC_DATA 0x03
#define A53_USER_DATA_TYPE_CODE_BAR_DATA 0x06
/* Copied from gstvideoparseutils.c */
gboolean
gst_h264_reorder_is_cea708_sei (guint8 country_code, const guint8 * data,
gsize size)
{
guint16 provider_code;
GstByteReader br;
guint32 user_data_id = 0;
guint8 user_data_type_code = 0;
if (country_code != ITU_T_T35_COUNTRY_CODE_UK &&
country_code != ITU_T_T35_COUNTRY_CODE_US) {
return FALSE;
}
if (!data || size < 2)
return FALSE;
gst_byte_reader_init (&br, data, size);
provider_code = gst_byte_reader_get_uint16_be_unchecked (&br);
switch (provider_code) {
case ITU_T_T35_MANUFACTURER_US_ATSC:
if (!gst_byte_reader_peek_uint32_be (&br, &user_data_id))
return FALSE;
switch (user_data_id) {
case A53_USER_DATA_ID_DTG1:
case A53_USER_DATA_ID_GA94:
/* ANSI/SCTE 128-2010a section 8.1.2 */
if (!gst_byte_reader_get_uint32_be (&br, &user_data_id))
return FALSE;
break;
default:
/* check for SCTE 20 */
if (user_data_id >> 24 == A53_USER_DATA_TYPE_CODE_CC_DATA) {
user_data_id = USER_DATA_ID_SCTE_20_CC;
gst_byte_reader_skip (&br, 1);
}
break;
}
break;
case ITU_T_T35_MANUFACTURER_US_DIRECTV:
user_data_id = USER_DATA_ID_DIRECTV_CC;
break;
default:
return FALSE;
}
switch (user_data_id) {
case USER_DATA_ID_DIRECTV_CC:
case A53_USER_DATA_ID_GA94:
if (!gst_byte_reader_get_uint8 (&br, &user_data_type_code))
return FALSE;
if (user_data_type_code == A53_USER_DATA_TYPE_CODE_CC_DATA)
return TRUE;
break;
default:
break;
}
return FALSE;
}
static GstBuffer *
gst_h264_reorder_remove_caption_sei (GstH264Reorder * self, GstBuffer * buffer)
{
GstH264ParserResult pres = GST_H264_PARSER_OK;
GstMapInfo map;
GstH264NalUnit nalu;
guint i;
gboolean have_sei = FALSE;
GstBuffer *new_buf;
g_array_set_size (self->au_nalus, 0);
gst_buffer_map (buffer, &map, GST_MAP_READ);
if (self->is_avc) {
guint offset = 0;
gsize consumed = 0;
guint i;
do {
pres = gst_h264_parser_identify_and_split_nalu_avc (self->parser,
map.data, offset, map.size, self->nal_length_size,
self->split_nalu, &consumed);
if (pres != GST_H264_PARSER_OK)
break;
for (i = 0; i < self->split_nalu->len; i++) {
nalu = g_array_index (self->split_nalu, GstH264NalUnit, i);
g_array_append_val (self->au_nalus, nalu);
}
offset += consumed;
} while (pres == GST_H264_PARSER_OK);
} else {
pres = gst_h264_parser_identify_nalu (self->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) {
g_array_append_val (self->au_nalus, nalu);
pres = gst_h264_parser_identify_nalu (self->parser,
map.data, nalu.offset + nalu.size, map.size, &nalu);
if (pres == GST_H264_PARSER_NO_NAL_END)
pres = GST_H264_PARSER_OK;
}
}
/* Fast scan without parsing */
for (i = 0; i < self->au_nalus->len; i++) {
GstH264NalUnit *nl = &g_array_index (self->au_nalus, GstH264NalUnit, i);
/* gst_h264_parser_parse_sei() will fail if SPS was not set */
if (nl->type == GST_H264_NAL_SPS) {
GstH264SPS sps;
pres = gst_h264_parser_parse_sps (self->parser, nl, &sps);
if (pres == GST_H264_PARSER_OK)
gst_h264_sps_clear (&sps);
} else if (nl->type == GST_H264_NAL_SEI) {
have_sei = TRUE;
}
}
if (!have_sei) {
GST_LOG_OBJECT (self, "Buffer without SEI, %" GST_PTR_FORMAT, buffer);
gst_buffer_unmap (buffer, &map);
g_array_set_size (self->au_nalus, 0);
return gst_buffer_ref (buffer);
}
new_buf = gst_buffer_new ();
gst_buffer_copy_into (new_buf, buffer, GST_BUFFER_COPY_METADATA, 0, -1);
for (i = 0; i < self->au_nalus->len; i++) {
GstH264NalUnit *nl = &g_array_index (self->au_nalus, GstH264NalUnit, i);
GstMemory *mem = NULL;
if (nl->type == GST_H264_NAL_SEI) {
GArray *msg = NULL;
gint j;
gst_h264_parser_parse_sei (self->parser, nl, &msg);
gboolean have_caption_sei = FALSE;
for (j = 0; j < (gint) msg->len; j++) {
GstH264SEIMessage *sei = &g_array_index (msg, GstH264SEIMessage, j);
GstH264RegisteredUserData *rud;
if (sei->payloadType != GST_H264_SEI_REGISTERED_USER_DATA)
continue;
rud = &sei->payload.registered_user_data;
if (!gst_h264_reorder_is_cea708_sei (rud->country_code,
rud->data, rud->size)) {
continue;
}
GST_LOG_OBJECT (self, "Found CEA708 caption SEI");
have_caption_sei = TRUE;
g_array_remove_index (msg, j);
j--;
}
if (have_caption_sei) {
if (msg->len > 0) {
/* Creates new SEI memory */
if (self->is_avc)
mem = gst_h264_create_sei_memory_avc (self->nal_length_size, msg);
else
mem = gst_h264_create_sei_memory (4, msg);
if (!mem)
GST_ERROR_OBJECT (self, "Couldn't create SEI memory");
else
gst_buffer_append_memory (new_buf, mem);
}
} else {
gsize size = nl->size + (nl->offset - nl->sc_offset);
gpointer *data = g_memdup2 (nl->data + nl->sc_offset, size);
mem = gst_memory_new_wrapped (0, data, size, 0, size, data, g_free);
gst_buffer_append_memory (new_buf, mem);
}
g_array_unref (msg);
} else {
gsize size = nl->size + (nl->offset - nl->sc_offset);
gpointer *data = g_memdup2 (nl->data + nl->sc_offset, size);
mem = gst_memory_new_wrapped (0, data, size, 0, size, data, g_free);
gst_buffer_append_memory (new_buf, mem);
}
}
gst_buffer_unmap (buffer, &map);
g_array_set_size (self->au_nalus, 0);
return new_buf;
}
gboolean
gst_h264_reorder_push (GstH264Reorder * reorder, GstVideoCodecFrame * frame,
GstClockTime * latency)
{
GstBuffer *in_buf;
GstH264NalUnit nalu;
GstH264ParserResult pres = GST_H264_PARSER_OK;
GstMapInfo map;
gboolean decode_ret = TRUE;
frame->system_frame_number = reorder->system_num;
frame->decode_frame_number = reorder->system_num;
GST_LOG_OBJECT (reorder,
"Push frame %u, frame queue size: %u, output queue size %u",
frame->system_frame_number, reorder->frame_queue->len,
reorder->output_queue->len);
in_buf = gst_h264_reorder_remove_caption_sei (reorder, frame->input_buffer);
if (in_buf) {
gst_buffer_unref (frame->input_buffer);
frame->input_buffer = in_buf;
} else {
in_buf = frame->input_buffer;
}
reorder->system_num++;
if (!reorder->need_reorder) {
g_ptr_array_add (reorder->output_queue, frame);
*latency = 0;
return TRUE;
}
g_ptr_array_add (reorder->frame_queue, frame);
reorder->current_frame = frame;
gst_buffer_map (in_buf, &map, GST_MAP_READ);
if (reorder->is_avc) {
guint offset = 0;
gsize consumed = 0;
guint i;
do {
pres = gst_h264_parser_identify_and_split_nalu_avc (reorder->parser,
map.data, offset, map.size, reorder->nal_length_size,
reorder->split_nalu, &consumed);
if (pres != GST_H264_PARSER_OK)
break;
for (i = 0; i < reorder->split_nalu->len; i++) {
GstH264NalUnit *nl =
&g_array_index (reorder->split_nalu, GstH264NalUnit, i);
decode_ret = gst_h264_reorder_decode_nal (reorder, nl);
if (!decode_ret)
break;
}
offset += consumed;
} while (pres == GST_H264_PARSER_OK && decode_ret);
} else {
pres = gst_h264_parser_identify_nalu (reorder->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_reorder_decode_nal (reorder, &nalu);
pres = gst_h264_parser_identify_nalu (reorder->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_ERROR_OBJECT (reorder, "Couldn't decode frame");
gst_clear_h264_picture (&reorder->current_picture);
reorder->current_frame = NULL;
g_ptr_array_remove (reorder->frame_queue, frame);
reorder->system_num--;
return FALSE;
}
if (!reorder->current_picture) {
GST_DEBUG_OBJECT (reorder,
"AU buffer without slice data, current frame %u",
frame->system_frame_number);
g_ptr_array_remove (reorder->frame_queue, frame);
reorder->current_frame = NULL;
reorder->system_num--;
return FALSE;
}
gst_h264_reorder_finish_picture (reorder, reorder->current_picture);
reorder->current_picture = NULL;
reorder->current_frame = NULL;
*latency = reorder->latency;
return TRUE;
}
GstVideoCodecFrame *
gst_h264_reorder_pop (GstH264Reorder * reorder)
{
if (!reorder->output_queue->len) {
GST_LOG_OBJECT (reorder, "Empty output queue, frames queue size %u",
reorder->frame_queue->len);
return NULL;
}
return g_ptr_array_steal_index (reorder->output_queue, 0);
}
guint
gst_h264_reorder_get_num_buffered (GstH264Reorder * reorder)
{
return reorder->frame_queue->len + reorder->output_queue->len;
}
GstBuffer *
gst_h264_reorder_insert_sei (GstH264Reorder * reorder, GstBuffer * au,
GArray * sei)
{
GstMemory *mem;
GstBuffer *new_buf;
if (reorder->is_avc)
mem = gst_h264_create_sei_memory_avc (reorder->nal_length_size, sei);
else
mem = gst_h264_create_sei_memory (4, sei);
if (!mem) {
GST_ERROR_OBJECT (reorder, "Couldn't create SEI memory");
return NULL;
}
if (reorder->is_avc) {
new_buf = gst_h264_parser_insert_sei_avc (reorder->parser,
reorder->nal_length_size, au, mem);
} else {
new_buf = gst_h264_parser_insert_sei (reorder->parser, au, mem);
}
gst_memory_unref (mem);
return new_buf;
}
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