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gstreamer/gst/videoparsers/gsth264parse.c
Sebastian Dröge 7c6093357b videoparsers: Fix GstBaseParse::get_sink_caps() implementations 
They should take the filter caps into account and always return
the template caps appended to the actual caps. Otherwise the
parsers stop to accept unparsed streams where upstream does not
know about width, height, etc.

Fixes bug #677401.
2012-06-05 09:30:00 +02:00

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/* GStreamer H.264 Parser
* Copyright (C) <2010> Collabora ltd
* Copyright (C) <2010> Nokia Corporation
* Copyright (C) <2011> Intel Corporation
*
* Copyright (C) <2010> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/base/gstbytereader.h>
#include <gst/base/gstbytewriter.h>
#include <gst/base/gstadapter.h>
#include <gst/video/video.h>
#include "gsth264parse.h"
#include <string.h>
GST_DEBUG_CATEGORY (h264_parse_debug);
#define GST_CAT_DEFAULT h264_parse_debug
#define DEFAULT_CONFIG_INTERVAL (0)
enum
{
PROP_0,
PROP_CONFIG_INTERVAL,
PROP_LAST
};
enum
{
GST_H264_PARSE_FORMAT_NONE,
GST_H264_PARSE_FORMAT_AVC,
GST_H264_PARSE_FORMAT_BYTE
};
enum
{
GST_H264_PARSE_ALIGN_NONE = 0,
GST_H264_PARSE_ALIGN_NAL,
GST_H264_PARSE_ALIGN_AU
};
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264"));
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264, parsed = (boolean) true, "
"stream-format=(string) { avc, byte-stream }, "
"alignment=(string) { au, nal }"));
#define parent_class gst_h264_parse_parent_class
G_DEFINE_TYPE (GstH264Parse, gst_h264_parse, GST_TYPE_BASE_PARSE);
static void gst_h264_parse_finalize (GObject * object);
static gboolean gst_h264_parse_start (GstBaseParse * parse);
static gboolean gst_h264_parse_stop (GstBaseParse * parse);
static GstFlowReturn gst_h264_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize);
static GstFlowReturn gst_h264_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static GstFlowReturn gst_h264_parse_pre_push_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static void gst_h264_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_h264_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps);
static GstCaps *gst_h264_parse_get_caps (GstBaseParse * parse,
GstCaps * filter);
static gboolean gst_h264_parse_event (GstBaseParse * parse, GstEvent * event);
static gboolean gst_h264_parse_src_event (GstBaseParse * parse,
GstEvent * event);
static void
gst_h264_parse_class_init (GstH264ParseClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (h264_parse_debug, "h264parse", 0, "h264 parser");
gobject_class->finalize = gst_h264_parse_finalize;
gobject_class->set_property = gst_h264_parse_set_property;
gobject_class->get_property = gst_h264_parse_get_property;
g_object_class_install_property (gobject_class, PROP_CONFIG_INTERVAL,
g_param_spec_uint ("config-interval",
"SPS PPS Send Interval",
"Send SPS and PPS Insertion Interval in seconds (sprop parameter sets "
"will be multiplexed in the data stream when detected.) (0 = disabled)",
0, 3600, DEFAULT_CONFIG_INTERVAL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
/* Override BaseParse vfuncs */
parse_class->start = GST_DEBUG_FUNCPTR (gst_h264_parse_start);
parse_class->stop = GST_DEBUG_FUNCPTR (gst_h264_parse_stop);
parse_class->handle_frame = GST_DEBUG_FUNCPTR (gst_h264_parse_handle_frame);
parse_class->pre_push_frame =
GST_DEBUG_FUNCPTR (gst_h264_parse_pre_push_frame);
parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_h264_parse_set_caps);
parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_h264_parse_get_caps);
parse_class->sink_event = GST_DEBUG_FUNCPTR (gst_h264_parse_event);
parse_class->src_event = GST_DEBUG_FUNCPTR (gst_h264_parse_src_event);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sinktemplate));
gst_element_class_set_details_simple (gstelement_class, "H.264 parser",
"Codec/Parser/Converter/Video",
"Parses H.264 streams",
"Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>");
}
static void
gst_h264_parse_init (GstH264Parse * h264parse)
{
h264parse->frame_out = gst_adapter_new ();
}
static void
gst_h264_parse_finalize (GObject * object)
{
GstH264Parse *h264parse = GST_H264_PARSE (object);
g_object_unref (h264parse->frame_out);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_h264_parse_reset_frame (GstH264Parse * h264parse)
{
GST_DEBUG_OBJECT (h264parse, "reset frame");
/* done parsing; reset state */
h264parse->current_off = -1;
h264parse->picture_start = FALSE;
h264parse->update_caps = FALSE;
h264parse->idr_pos = -1;
h264parse->sei_pos = -1;
h264parse->keyframe = FALSE;
h264parse->frame_start = FALSE;
gst_adapter_clear (h264parse->frame_out);
}
static void
gst_h264_parse_reset (GstH264Parse * h264parse)
{
h264parse->width = 0;
h264parse->height = 0;
h264parse->fps_num = 0;
h264parse->fps_den = 0;
h264parse->aspect_ratio_idc = 0;
h264parse->sar_width = 0;
h264parse->sar_height = 0;
h264parse->upstream_par_n = -1;
h264parse->upstream_par_d = -1;
gst_buffer_replace (&h264parse->codec_data, NULL);
h264parse->nal_length_size = 4;
h264parse->packetized = FALSE;
h264parse->transform = FALSE;
h264parse->align = GST_H264_PARSE_ALIGN_NONE;
h264parse->format = GST_H264_PARSE_FORMAT_NONE;
h264parse->last_report = GST_CLOCK_TIME_NONE;
h264parse->push_codec = FALSE;
h264parse->have_pps = FALSE;
h264parse->have_sps = FALSE;
h264parse->dts = GST_CLOCK_TIME_NONE;
h264parse->ts_trn_nb = GST_CLOCK_TIME_NONE;
h264parse->do_ts = TRUE;
h264parse->pending_key_unit_ts = GST_CLOCK_TIME_NONE;
h264parse->force_key_unit_event = NULL;
gst_h264_parse_reset_frame (h264parse);
}
static gboolean
gst_h264_parse_start (GstBaseParse * parse)
{
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GST_DEBUG_OBJECT (parse, "start");
gst_h264_parse_reset (h264parse);
h264parse->nalparser = gst_h264_nal_parser_new ();
h264parse->dts = GST_CLOCK_TIME_NONE;
h264parse->ts_trn_nb = GST_CLOCK_TIME_NONE;
h264parse->sei_pic_struct_pres_flag = FALSE;
h264parse->sei_pic_struct = 0;
h264parse->field_pic_flag = 0;
gst_base_parse_set_min_frame_size (parse, 6);
return TRUE;
}
static gboolean
gst_h264_parse_stop (GstBaseParse * parse)
{
guint i;
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GST_DEBUG_OBJECT (parse, "stop");
gst_h264_parse_reset (h264parse);
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++)
gst_buffer_replace (&h264parse->sps_nals[i], NULL);
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++)
gst_buffer_replace (&h264parse->pps_nals[i], NULL);
gst_h264_nal_parser_free (h264parse->nalparser);
return TRUE;
}
static const gchar *
gst_h264_parse_get_string (GstH264Parse * parse, gboolean format, gint code)
{
if (format) {
switch (code) {
case GST_H264_PARSE_FORMAT_AVC:
return "avc";
case GST_H264_PARSE_FORMAT_BYTE:
return "byte-stream";
default:
return "none";
}
} else {
switch (code) {
case GST_H264_PARSE_ALIGN_NAL:
return "nal";
case GST_H264_PARSE_ALIGN_AU:
return "au";
default:
return "none";
}
}
}
static void
gst_h264_parse_format_from_caps (GstCaps * caps, guint * format, guint * align)
{
g_return_if_fail (gst_caps_is_fixed (caps));
GST_DEBUG ("parsing caps: %" GST_PTR_FORMAT, caps);
if (format)
*format = GST_H264_PARSE_FORMAT_NONE;
if (align)
*align = GST_H264_PARSE_ALIGN_NONE;
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)
*format = GST_H264_PARSE_FORMAT_AVC;
else if (strcmp (str, "byte-stream") == 0)
*format = GST_H264_PARSE_FORMAT_BYTE;
}
}
if (align) {
if ((str = gst_structure_get_string (s, "alignment"))) {
if (strcmp (str, "au") == 0)
*align = GST_H264_PARSE_ALIGN_AU;
else if (strcmp (str, "nal") == 0)
*align = GST_H264_PARSE_ALIGN_NAL;
}
}
}
}
/* check downstream caps to configure format and alignment */
static void
gst_h264_parse_negotiate (GstH264Parse * h264parse, gint in_format,
GstCaps * in_caps)
{
GstCaps *caps;
guint format = GST_H264_PARSE_FORMAT_NONE;
guint align = GST_H264_PARSE_ALIGN_NONE;
g_return_if_fail ((in_caps == NULL) || gst_caps_is_fixed (in_caps));
caps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (h264parse));
GST_DEBUG_OBJECT (h264parse, "allowed caps: %" GST_PTR_FORMAT, caps);
/* concentrate on leading structure, since decodebin2 parser
* capsfilter always includes parser template caps */
if (caps) {
caps = gst_caps_truncate (caps);
GST_DEBUG_OBJECT (h264parse, "negotiating with caps: %" GST_PTR_FORMAT,
caps);
}
if (in_caps && caps) {
if (gst_caps_can_intersect (in_caps, caps)) {
GST_DEBUG_OBJECT (h264parse, "downstream accepts upstream caps");
gst_h264_parse_format_from_caps (in_caps, &format, &align);
gst_caps_unref (caps);
caps = NULL;
}
}
if (caps) {
/* fixate to avoid ambiguity with lists when parsing */
caps = gst_caps_fixate (caps);
gst_h264_parse_format_from_caps (caps, &format, &align);
gst_caps_unref (caps);
}
/* default */
if (!format)
format = GST_H264_PARSE_FORMAT_BYTE;
if (!align)
align = GST_H264_PARSE_ALIGN_AU;
GST_DEBUG_OBJECT (h264parse, "selected format %s, alignment %s",
gst_h264_parse_get_string (h264parse, TRUE, format),
gst_h264_parse_get_string (h264parse, FALSE, align));
h264parse->format = format;
h264parse->align = align;
h264parse->transform = (in_format != h264parse->format);
}
static GstBuffer *
gst_h264_parse_wrap_nal (GstH264Parse * h264parse, guint format, guint8 * data,
guint size)
{
GstBuffer *buf;
guint nl = h264parse->nal_length_size;
guint32 tmp;
GST_DEBUG_OBJECT (h264parse, "nal length %d", size);
buf = gst_buffer_new_allocate (NULL, nl + size, NULL);
if (format == GST_H264_PARSE_FORMAT_AVC) {
tmp = GUINT32_TO_BE (size << (32 - 8 * nl));
} else {
/* HACK: nl should always be 4 here, otherwise this won't work.
* There are legit cases where nl in avc stream is 2, but byte-stream
* SC is still always 4 bytes. */
nl = 4;
tmp = GUINT32_TO_BE (1);
}
gst_buffer_fill (buf, 0, &tmp, sizeof (guint32));
gst_buffer_fill (buf, nl, data, size);
return buf;
}
static void
gst_h264_parser_store_nal (GstH264Parse * h264parse, guint id,
GstH264NalUnitType naltype, GstH264NalUnit * nalu)
{
GstBuffer *buf, **store;
guint size = nalu->size, store_size;
if (naltype == GST_H264_NAL_SPS) {
store_size = GST_H264_MAX_SPS_COUNT;
store = h264parse->sps_nals;
GST_DEBUG_OBJECT (h264parse, "storing sps %u", id);
} else if (naltype == GST_H264_NAL_PPS) {
store_size = GST_H264_MAX_PPS_COUNT;
store = h264parse->pps_nals;
GST_DEBUG_OBJECT (h264parse, "storing pps %u", id);
} else
return;
if (id >= store_size) {
GST_DEBUG_OBJECT (h264parse, "unable to store nal, id out-of-range %d", id);
return;
}
buf = gst_buffer_new_allocate (NULL, size, NULL);
gst_buffer_fill (buf, 0, nalu->data + nalu->offset, size);
if (store[id])
gst_buffer_unref (store[id]);
store[id] = buf;
}
/* SPS/PPS/IDR considered key, all others DELTA;
* so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
#define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
/* caller guarantees 2 bytes of nal payload */
static void
gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
{
guint nal_type;
GstH264PPS pps;
GstH264SPS sps;
GstH264SEIMessage sei;
GstH264NalParser *nalparser = h264parse->nalparser;
/* nothing to do for broken input */
if (G_UNLIKELY (nalu->size < 2)) {
GST_DEBUG_OBJECT (h264parse, "not processing nal size %u", nalu->size);
return;
}
/* we have a peek as well */
nal_type = nalu->type;
h264parse->keyframe |= NAL_TYPE_IS_KEY (nal_type);
GST_DEBUG_OBJECT (h264parse, "processing nal of type %u, size %u",
nal_type, nalu->size);
switch (nal_type) {
case GST_H264_NAL_SPS:
gst_h264_parser_parse_sps (nalparser, nalu, &sps, TRUE);
GST_DEBUG_OBJECT (h264parse, "triggering src caps check");
h264parse->update_caps = TRUE;
h264parse->have_sps = TRUE;
if (h264parse->push_codec && h264parse->have_pps) {
/* SPS and PPS found in stream before the first pre_push_frame, no need
* to forcibly push at start */
GST_INFO_OBJECT (h264parse, "have SPS/PPS in stream");
h264parse->push_codec = FALSE;
h264parse->have_sps = FALSE;
h264parse->have_pps = FALSE;
}
gst_h264_parser_store_nal (h264parse, sps.id, nal_type, nalu);
break;
case GST_H264_NAL_PPS:
gst_h264_parser_parse_pps (nalparser, nalu, &pps);
/* parameters might have changed, force caps check */
GST_DEBUG_OBJECT (h264parse, "triggering src caps check");
h264parse->update_caps = TRUE;
h264parse->have_pps = TRUE;
if (h264parse->push_codec && h264parse->have_sps) {
/* SPS and PPS found in stream before the first pre_push_frame, no need
* to forcibly push at start */
GST_INFO_OBJECT (h264parse, "have SPS/PPS in stream");
h264parse->push_codec = FALSE;
h264parse->have_sps = FALSE;
h264parse->have_pps = FALSE;
}
gst_h264_parser_store_nal (h264parse, pps.id, nal_type, nalu);
break;
case GST_H264_NAL_SEI:
gst_h264_parser_parse_sei (nalparser, nalu, &sei);
switch (sei.payloadType) {
case GST_H264_SEI_PIC_TIMING:
h264parse->sei_pic_struct_pres_flag =
sei.pic_timing.pic_struct_present_flag;
h264parse->sei_cpb_removal_delay = sei.pic_timing.cpb_removal_delay;
if (h264parse->sei_pic_struct_pres_flag)
h264parse->sei_pic_struct = sei.pic_timing.pic_struct;
break;
case GST_H264_SEI_BUF_PERIOD:
if (h264parse->ts_trn_nb == GST_CLOCK_TIME_NONE ||
h264parse->dts == GST_CLOCK_TIME_NONE)
h264parse->ts_trn_nb = 0;
else
h264parse->ts_trn_nb = h264parse->dts;
GST_LOG_OBJECT (h264parse,
"new buffering period; ts_trn_nb updated: %" GST_TIME_FORMAT,
GST_TIME_ARGS (h264parse->ts_trn_nb));
break;
}
/* mark SEI pos */
if (h264parse->sei_pos == -1) {
if (h264parse->transform)
h264parse->sei_pos = gst_adapter_available (h264parse->frame_out);
else
h264parse->sei_pos = nalu->sc_offset;
GST_DEBUG_OBJECT (h264parse, "marking SEI in frame at offset %d",
h264parse->sei_pos);
}
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:
/* don't need to parse the whole slice (header) here */
if (*(nalu->data + nalu->offset + 1) & 0x80) {
/* means first_mb_in_slice == 0 */
/* real frame data */
GST_DEBUG_OBJECT (h264parse, "first_mb_in_slice = 0");
h264parse->frame_start = TRUE;
}
GST_DEBUG_OBJECT (h264parse, "frame start: %i", h264parse->frame_start);
#ifndef GST_DISABLE_GST_DEBUG
{
GstH264SliceHdr slice;
GstH264ParserResult pres;
pres = gst_h264_parser_parse_slice_hdr (nalparser, nalu, &slice,
FALSE, FALSE);
GST_DEBUG_OBJECT (h264parse,
"parse result %d, first MB: %u, slice type: %u",
pres, slice.first_mb_in_slice, slice.type);
}
#endif
if (G_LIKELY (nal_type != GST_H264_NAL_SLICE_IDR &&
!h264parse->push_codec))
break;
/* if we need to sneak codec NALs into the stream,
* this is a good place, so fake it as IDR
* (which should be at start anyway) */
/* mark where config needs to go if interval expired */
/* mind replacement buffer if applicable */
if (h264parse->idr_pos == -1) {
if (h264parse->transform)
h264parse->idr_pos = gst_adapter_available (h264parse->frame_out);
else
h264parse->idr_pos = nalu->sc_offset;
GST_DEBUG_OBJECT (h264parse, "marking IDR in frame at offset %d",
h264parse->idr_pos);
}
/* if SEI preceeds (faked) IDR, then we have to insert config there */
if (h264parse->sei_pos >= 0 && h264parse->idr_pos > h264parse->sei_pos) {
h264parse->idr_pos = h264parse->sei_pos;
GST_DEBUG_OBJECT (h264parse, "moved IDR mark to SEI position %d",
h264parse->idr_pos);
}
break;
default:
gst_h264_parser_parse_nal (nalparser, nalu);
}
/* if AVC output needed, collect properly prefixed nal in adapter,
* and use that to replace outgoing buffer data later on */
if (h264parse->transform) {
GstBuffer *buf;
GST_LOG_OBJECT (h264parse, "collecting NAL in AVC frame");
buf = gst_h264_parse_wrap_nal (h264parse, h264parse->format,
nalu->data + nalu->offset, nalu->size);
gst_adapter_push (h264parse->frame_out, buf);
}
}
/* caller guarantees at least 2 bytes of nal payload for each nal
* returns TRUE if next_nal indicates that nal terminates an AU */
static inline gboolean
gst_h264_parse_collect_nal (GstH264Parse * h264parse, const guint8 * data,
guint size, GstH264NalUnit * nalu)
{
gboolean complete;
GstH264ParserResult parse_res;
GstH264NalUnitType nal_type = nalu->type;
GstH264NalUnit nnalu;
GST_DEBUG_OBJECT (h264parse, "parsing collected nal");
parse_res = gst_h264_parser_identify_nalu (h264parse->nalparser, data,
nalu->offset + nalu->size, size, &nnalu);
if (parse_res == GST_H264_PARSER_ERROR)
return FALSE;
/* determine if AU complete */
GST_LOG_OBJECT (h264parse, "nal type: %d", nal_type);
/* coded slice NAL starts a picture,
* i.e. other types become aggregated in front of it */
h264parse->picture_start |= (nal_type == GST_H264_NAL_SLICE ||
nal_type == GST_H264_NAL_SLICE_DPA || nal_type == GST_H264_NAL_SLICE_IDR);
/* consider a coded slices (IDR or not) to start a picture,
* (so ending the previous one) if first_mb_in_slice == 0
* (non-0 is part of previous one) */
/* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4,
* but in practice it works in sane cases, needs not much parsing,
* and also works with broken frame_num in NAL
* (where spec-wise would fail) */
nal_type = nnalu.type;
complete = h264parse->picture_start && (nal_type >= GST_H264_NAL_SEI &&
nal_type <= GST_H264_NAL_AU_DELIMITER);
GST_LOG_OBJECT (h264parse, "next nal type: %d", nal_type);
complete |= h264parse->picture_start &&
(nal_type == GST_H264_NAL_SLICE ||
nal_type == GST_H264_NAL_SLICE_DPA ||
nal_type == GST_H264_NAL_SLICE_IDR) &&
/* first_mb_in_slice == 0 considered start of frame */
(nnalu.data[nnalu.offset + 1] & 0x80);
GST_LOG_OBJECT (h264parse, "au complete: %d", complete);
return complete;
}
static GstFlowReturn
gst_h264_parse_handle_frame_packetized (GstBaseParse * parse,
GstBaseParseFrame * frame)
{
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GstBuffer *buffer = frame->buffer;
GstFlowReturn ret = GST_FLOW_OK;
GstH264ParserResult parse_res;
GstH264NalUnit nalu;
const guint nl = h264parse->nal_length_size;
GstMapInfo map;
gint left;
if (nl < 1 || nl > 4) {
GST_DEBUG_OBJECT (h264parse, "insufficient data to split input");
return GST_FLOW_NOT_NEGOTIATED;
}
/* need to save buffer from invalidation upon _finish_frame */
if (h264parse->split_packetized)
buffer = gst_buffer_copy (frame->buffer);
gst_buffer_map (buffer, &map, GST_MAP_READ);
left = map.size;
GST_LOG_OBJECT (h264parse,
"processing packet buffer of size %" G_GSIZE_FORMAT, map.size);
parse_res = gst_h264_parser_identify_nalu_avc (h264parse->nalparser,
map.data, 0, map.size, nl, &nalu);
while (parse_res == GST_H264_PARSER_OK) {
GST_DEBUG_OBJECT (h264parse, "AVC nal offset %d", nalu.offset + nalu.size);
/* either way, have a look at it */
gst_h264_parse_process_nal (h264parse, &nalu);
/* dispatch per NALU if needed */
if (h264parse->split_packetized) {
/* note we don't need to come up with a sub-buffer, since
* subsequent code only considers input buffer's metadata.
* Real data is either taken from input by baseclass or
* a replacement output buffer is provided anyway. */
gst_h264_parse_parse_frame (parse, frame);
ret = gst_base_parse_finish_frame (parse, frame, nl + nalu.size);
left -= nl + nalu.size;
}
parse_res = gst_h264_parser_identify_nalu_avc (h264parse->nalparser,
map.data, nalu.offset + nalu.size, map.size, nl, &nalu);
}
gst_buffer_unmap (buffer, &map);
if (!h264parse->split_packetized) {
gst_h264_parse_parse_frame (parse, frame);
ret = gst_base_parse_finish_frame (parse, frame, map.size);
} else {
gst_buffer_unref (buffer);
if (G_UNLIKELY (left)) {
/* should not be happening for nice AVC */
GST_WARNING_OBJECT (parse, "skipping leftover AVC data %d", left);
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_DROP;
ret = gst_base_parse_finish_frame (parse, frame, map.size);
}
}
if (parse_res == GST_H264_PARSER_NO_NAL_END ||
parse_res == GST_H264_PARSER_BROKEN_DATA) {
if (h264parse->split_packetized) {
GST_ELEMENT_ERROR (h264parse, STREAM, FAILED, (NULL),
("invalid AVC input data"));
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
} else {
/* do not meddle to much in this case */
GST_DEBUG_OBJECT (h264parse, "parsing packet failed");
}
}
return ret;
}
static GstFlowReturn
gst_h264_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GstBuffer *buffer = frame->buffer;
GstMapInfo map;
guint8 *data;
gsize size;
gint current_off = 0;
gboolean drain, nonext;
GstH264NalParser *nalparser = h264parse->nalparser;
GstH264NalUnit nalu;
GstH264ParserResult pres;
gint framesize;
/* delegate in packetized case, no skipping should be needed */
if (h264parse->packetized)
return gst_h264_parse_handle_frame_packetized (parse, frame);
gst_buffer_map (buffer, &map, GST_MAP_READ);
data = map.data;
size = map.size;
/* expect at least 3 bytes startcode == sc, and 2 bytes NALU payload */
if (G_UNLIKELY (size < 5)) {
gst_buffer_unmap (buffer, &map);
*skipsize = 1;
return GST_FLOW_OK;
}
/* need to configure aggregation */
if (G_UNLIKELY (h264parse->format == GST_H264_PARSE_FORMAT_NONE))
gst_h264_parse_negotiate (h264parse, GST_H264_PARSE_FORMAT_BYTE, NULL);
/* avoid stale cached parsing state */
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME) {
GST_LOG_OBJECT (h264parse, "parsing new frame");
gst_h264_parse_reset_frame (h264parse);
} else {
GST_LOG_OBJECT (h264parse, "resuming frame parsing");
}
drain = GST_BASE_PARSE_DRAINING (parse);
nonext = FALSE;
current_off = h264parse->current_off;
if (current_off < 0)
current_off = 0;
g_assert (current_off < size);
GST_DEBUG_OBJECT (h264parse, "last parse position %d", current_off);
/* check for initial skip */
if (h264parse->current_off == -1) {
pres =
gst_h264_parser_identify_nalu_unchecked (nalparser, data, current_off,
size, &nalu);
switch (pres) {
case GST_H264_PARSER_OK:
if (nalu.sc_offset > 0) {
*skipsize = nalu.sc_offset;
goto skip;
}
break;
case GST_H264_PARSER_NO_NAL:
*skipsize = size - 3;
goto skip;
break;
default:
g_assert_not_reached ();
break;
}
}
while (TRUE) {
pres =
gst_h264_parser_identify_nalu (nalparser, data, current_off, size,
&nalu);
switch (pres) {
case GST_H264_PARSER_OK:
GST_DEBUG_OBJECT (h264parse, "complete nal (offset, size): (%u, %u) ",
nalu.offset, nalu.size);
break;
case GST_H264_PARSER_NO_NAL_END:
GST_DEBUG_OBJECT (h264parse, "not a complete nal found at offset %u",
nalu.offset);
/* if draining, accept it as complete nal */
if (drain) {
nonext = TRUE;
nalu.size = size - nalu.offset;
GST_DEBUG_OBJECT (h264parse, "draining, accepting with size %u",
nalu.size);
/* if it's not too short at least */
if (nalu.size < 2)
goto broken;
break;
}
/* otherwise need more */
goto more;
case GST_H264_PARSER_BROKEN_LINK:
g_assert_not_reached ();
break;
case GST_H264_PARSER_ERROR:
/* should not really occur either */
GST_DEBUG_OBJECT (h264parse, "error parsing Nal Unit");
/* fall-through */
case GST_H264_PARSER_NO_NAL:
g_assert_not_reached ();
break;
case GST_H264_PARSER_BROKEN_DATA:
GST_WARNING_OBJECT (h264parse, "input stream is corrupt; "
"it contains a NAL unit of length %u", nalu.size);
broken:
/* broken nal at start -> arrange to skip it,
* otherwise have it terminate current au
* (and so it will be skipped on next frame round) */
if (current_off == 0) {
GST_DEBUG_OBJECT (h264parse, "skipping broken nal");
*skipsize = nalu.offset;
goto skip;
} else {
GST_DEBUG_OBJECT (h264parse, "terminating au");
nalu.size = 0;
nalu.offset = nalu.sc_offset;
goto end;
}
break;
default:
g_assert_not_reached ();
break;
}
GST_DEBUG_OBJECT (h264parse, "%p complete nal found. Off: %u, Size: %u",
data, nalu.offset, nalu.size);
/* simulate no next nal if none needed */
nonext = nonext || (h264parse->align == GST_H264_PARSE_ALIGN_NAL);
if (!nonext) {
if (nalu.offset + nalu.size + 4 + 2 > size) {
GST_DEBUG_OBJECT (h264parse, "not enough data for next NALU");
if (drain) {
GST_DEBUG_OBJECT (h264parse, "but draining anyway");
nonext = TRUE;
} else {
goto more;
}
}
}
gst_h264_parse_process_nal (h264parse, &nalu);
if (nonext)
break;
/* if no next nal, we know it's complete here */
if (gst_h264_parse_collect_nal (h264parse, data, size, &nalu))
break;
GST_DEBUG_OBJECT (h264parse, "Looking for more");
current_off = nalu.offset + nalu.size;
}
end:
framesize = nalu.offset + nalu.size;
gst_buffer_unmap (buffer, &map);
gst_h264_parse_parse_frame (parse, frame);
return gst_base_parse_finish_frame (parse, frame, framesize);
more:
*skipsize = 0;
/* Restart parsing from here next time */
if (current_off > 0)
h264parse->current_off = current_off;
/* Fall-through. */
out:
gst_buffer_unmap (buffer, &map);
return GST_FLOW_OK;
skip:
GST_DEBUG_OBJECT (h264parse, "skipping %d", *skipsize);
gst_h264_parse_reset_frame (h264parse);
goto out;
}
/* byte together avc codec data based on collected pps and sps so far */
static GstBuffer *
gst_h264_parse_make_codec_data (GstH264Parse * h264parse)
{
GstBuffer *buf, *nal;
gint i, sps_size = 0, pps_size = 0, num_sps = 0, num_pps = 0;
guint8 profile_idc = 0, profile_comp = 0, level_idc = 0;
gboolean found = FALSE;
GstMapInfo map;
guint8 *data;
gint nl;
/* only nal payload in stored nals */
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) {
if ((nal = h264parse->sps_nals[i])) {
gsize size = gst_buffer_get_size (nal);
num_sps++;
/* size bytes also count */
sps_size += size + 2;
if (size >= 4) {
guint8 tmp[3];
found = TRUE;
gst_buffer_extract (nal, 1, tmp, 3);
profile_idc = tmp[0];
profile_comp = tmp[1];
level_idc = tmp[2];
}
}
}
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) {
if ((nal = h264parse->pps_nals[i])) {
num_pps++;
/* size bytes also count */
pps_size += gst_buffer_get_size (nal) + 2;
}
}
GST_DEBUG_OBJECT (h264parse,
"constructing codec_data: num_sps=%d, num_pps=%d", num_sps, num_pps);
if (!found || !num_pps)
return NULL;
buf = gst_buffer_new_allocate (NULL, 5 + 1 + sps_size + 1 + pps_size, NULL);
gst_buffer_map (buf, &map, GST_MAP_WRITE);
data = map.data;
nl = h264parse->nal_length_size;
data[0] = 1; /* AVC Decoder Configuration Record ver. 1 */
data[1] = profile_idc; /* profile_idc */
data[2] = profile_comp; /* profile_compability */
data[3] = level_idc; /* level_idc */
data[4] = 0xfc | (nl - 1); /* nal_length_size_minus1 */
data[5] = 0xe0 | num_sps; /* number of SPSs */
data += 6;
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) {
if ((nal = h264parse->sps_nals[i])) {
gsize nal_size = gst_buffer_get_size (nal);
GST_WRITE_UINT16_BE (data, nal_size);
gst_buffer_extract (nal, 0, data + 2, nal_size);
data += 2 + nal_size;
}
}
data[0] = num_pps;
data++;
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) {
if ((nal = h264parse->pps_nals[i])) {
gsize nal_size = gst_buffer_get_size (nal);
GST_WRITE_UINT16_BE (data, nal_size);
gst_buffer_extract (nal, 0, data + 2, nal_size);
data += 2 + nal_size;
}
}
gst_buffer_unmap (buf, &map);
return buf;
}
static void
gst_h264_parse_get_par (GstH264Parse * h264parse, gint * num, gint * den)
{
gint par_n, par_d;
if (h264parse->upstream_par_n != -1 && h264parse->upstream_par_d != -1) {
*num = h264parse->upstream_par_n;
*den = h264parse->upstream_par_d;
return;
}
par_n = par_d = 0;
switch (h264parse->aspect_ratio_idc) {
case 0:
par_n = par_d = 0;
break;
case 1:
par_n = 1;
par_d = 1;
break;
case 2:
par_n = 12;
par_d = 11;
break;
case 3:
par_n = 10;
par_d = 11;
break;
case 4:
par_n = 16;
par_d = 11;
break;
case 5:
par_n = 40;
par_d = 33;
break;
case 6:
par_n = 24;
par_d = 11;
break;
case 7:
par_n = 20;
par_d = 11;
break;
case 8:
par_n = 32;
par_d = 11;
break;
case 9:
par_n = 80;
par_d = 33;
break;
case 10:
par_n = 18;
par_d = 11;
break;
case 11:
par_n = 15;
par_d = 11;
break;
case 12:
par_n = 64;
par_d = 33;
break;
case 13:
par_n = 160;
par_d = 99;
break;
case 14:
par_n = 4;
par_d = 3;
break;
case 15:
par_n = 3;
par_d = 2;
break;
case 16:
par_n = 2;
par_d = 1;
break;
case 255:
par_n = h264parse->sar_width;
par_d = h264parse->sar_height;
break;
default:
par_n = par_d = 0;
}
*num = par_n;
*den = par_d;
}
static void
gst_h264_parse_update_src_caps (GstH264Parse * h264parse, GstCaps * caps)
{
GstH264SPS *sps;
GstCaps *sink_caps;
gboolean modified = FALSE;
GstBuffer *buf = NULL;
if (G_UNLIKELY (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD
(h264parse))))
modified = TRUE;
else if (G_UNLIKELY (!h264parse->update_caps))
return;
/* if this is being called from the first _setcaps call, caps on the sinkpad
* aren't set yet and so they need to be passed as an argument */
if (caps)
sink_caps = gst_caps_ref (caps);
else
sink_caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (h264parse));
/* carry over input caps as much as possible; override with our own stuff */
if (!sink_caps)
sink_caps = gst_caps_new_empty_simple ("video/x-h264");
sps = h264parse->nalparser->last_sps;
GST_DEBUG_OBJECT (h264parse, "sps: %p", sps);
/* only codec-data for nice-and-clean au aligned packetized avc format */
if (h264parse->format == GST_H264_PARSE_FORMAT_AVC &&
h264parse->align == GST_H264_PARSE_ALIGN_AU) {
buf = gst_h264_parse_make_codec_data (h264parse);
if (buf && h264parse->codec_data) {
GstMapInfo map;
gst_buffer_map (buf, &map, GST_MAP_READ);
if (map.size != gst_buffer_get_size (h264parse->codec_data) ||
gst_buffer_memcmp (h264parse->codec_data, 0, map.data, map.size))
modified = TRUE;
gst_buffer_unmap (buf, &map);
} else {
if (h264parse->codec_data)
buf = gst_buffer_ref (h264parse->codec_data);
modified = TRUE;
}
}
caps = NULL;
if (G_UNLIKELY (!sps)) {
caps = gst_caps_copy (sink_caps);
} else {
if (G_UNLIKELY (h264parse->width != sps->width ||
h264parse->height != sps->height)) {
GST_INFO_OBJECT (h264parse, "resolution changed %dx%d",
sps->width, sps->height);
h264parse->width = sps->width;
h264parse->height = sps->height;
modified = TRUE;
}
/* 0/1 is set as the default in the codec parser */
if (sps->vui_parameters.timing_info_present_flag &&
!(sps->fps_num == 0 && sps->fps_den == 1)) {
if (G_UNLIKELY (h264parse->fps_num != sps->fps_num
|| h264parse->fps_den != sps->fps_den)) {
GST_INFO_OBJECT (h264parse, "framerate changed %d/%d",
sps->fps_num, sps->fps_den);
h264parse->fps_num = sps->fps_num;
h264parse->fps_den = sps->fps_den;
gst_base_parse_set_frame_rate (GST_BASE_PARSE (h264parse),
h264parse->fps_num, h264parse->fps_den, 0, 0);
modified = TRUE;
}
}
if (sps->vui_parameters.aspect_ratio_info_present_flag) {
if (G_UNLIKELY (h264parse->aspect_ratio_idc !=
sps->vui_parameters.aspect_ratio_idc)) {
h264parse->aspect_ratio_idc = sps->vui_parameters.aspect_ratio_idc;
GST_INFO_OBJECT (h264parse, "aspect ratio idc changed %d",
h264parse->aspect_ratio_idc);
modified = TRUE;
}
/* 255 means sar_width and sar_height present */
if (G_UNLIKELY (sps->vui_parameters.aspect_ratio_idc == 255 &&
(h264parse->sar_width != sps->vui_parameters.sar_width ||
h264parse->sar_height != sps->vui_parameters.sar_height))) {
h264parse->sar_width = sps->vui_parameters.sar_width;
h264parse->sar_height = sps->vui_parameters.sar_height;
GST_INFO_OBJECT (h264parse, "aspect ratio SAR changed %d/%d",
h264parse->sar_width, h264parse->sar_height);
modified = TRUE;
}
}
if (G_UNLIKELY (modified)) {
caps = gst_caps_copy (sink_caps);
/* sps should give this */
gst_caps_set_simple (caps, "width", G_TYPE_INT, sps->width,
"height", G_TYPE_INT, sps->height, NULL);
/* but not necessarily or reliably this */
if (h264parse->fps_num > 0 && h264parse->fps_den > 0)
gst_caps_set_simple (caps, "framerate",
GST_TYPE_FRACTION, h264parse->fps_num, h264parse->fps_den, NULL);
}
}
if (caps) {
gint par_n, par_d;
gst_caps_set_simple (caps, "parsed", G_TYPE_BOOLEAN, TRUE,
"stream-format", G_TYPE_STRING,
gst_h264_parse_get_string (h264parse, TRUE, h264parse->format),
"alignment", G_TYPE_STRING,
gst_h264_parse_get_string (h264parse, FALSE, h264parse->align), NULL);
gst_h264_parse_get_par (h264parse, &par_n, &par_d);
if (par_n != 0 && par_d != 0) {
GST_INFO_OBJECT (h264parse, "PAR %d/%d", par_n, par_d);
gst_caps_set_simple (caps, "pixel-aspect-ratio", GST_TYPE_FRACTION,
par_n, par_d, NULL);
}
if (buf) {
gst_caps_set_simple (caps, "codec_data", GST_TYPE_BUFFER, buf, NULL);
gst_buffer_replace (&h264parse->codec_data, buf);
gst_buffer_unref (buf);
buf = NULL;
} else {
GstStructure *s;
/* remove any left-over codec-data hanging around */
s = gst_caps_get_structure (caps, 0);
gst_structure_remove_field (s, "codec_data");
}
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (h264parse), caps);
gst_caps_unref (caps);
}
gst_caps_unref (sink_caps);
if (buf)
gst_buffer_unref (buf);
}
static void
gst_h264_parse_get_timestamp (GstH264Parse * h264parse,
GstClockTime * out_ts, GstClockTime * out_dur, gboolean frame)
{
GstH264SPS *sps = h264parse->nalparser->last_sps;
GstClockTime upstream;
gint duration = 1;
g_return_if_fail (out_dur != NULL);
g_return_if_fail (out_ts != NULL);
upstream = *out_ts;
if (!frame) {
GST_LOG_OBJECT (h264parse, "no frame data -> 0 duration");
*out_dur = 0;
goto exit;
} else {
*out_ts = upstream;
}
if (!sps) {
GST_DEBUG_OBJECT (h264parse, "referred SPS invalid");
goto exit;
} else if (!sps->vui_parameters.timing_info_present_flag) {
GST_DEBUG_OBJECT (h264parse,
"unable to compute timestamp: timing info not present");
goto exit;
} else if (sps->vui_parameters.time_scale == 0) {
GST_DEBUG_OBJECT (h264parse,
"unable to compute timestamp: time_scale = 0 "
"(this is forbidden in spec; bitstream probably contains error)");
goto exit;
}
if (h264parse->sei_pic_struct_pres_flag &&
h264parse->sei_pic_struct != (guint8) - 1) {
/* Note that when h264parse->sei_pic_struct == -1 (unspecified), there
* are ways to infer its value. This is related to computing the
* TopFieldOrderCnt and BottomFieldOrderCnt, which looks
* complicated and thus not implemented for the time being. Yet
* the value we have here is correct for many applications
*/
switch (h264parse->sei_pic_struct) {
case GST_H264_SEI_PIC_STRUCT_TOP_FIELD:
case GST_H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
duration = 1;
break;
case GST_H264_SEI_PIC_STRUCT_FRAME:
case GST_H264_SEI_PIC_STRUCT_TOP_BOTTOM:
case GST_H264_SEI_PIC_STRUCT_BOTTOM_TOP:
duration = 2;
break;
case GST_H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
case GST_H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
duration = 3;
break;
case GST_H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
duration = 4;
break;
case GST_H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
duration = 6;
break;
default:
GST_DEBUG_OBJECT (h264parse,
"h264parse->sei_pic_struct of unknown value %d. Not parsed",
h264parse->sei_pic_struct);
break;
}
} else {
duration = h264parse->field_pic_flag ? 1 : 2;
}
GST_LOG_OBJECT (h264parse, "frame tick duration %d", duration);
/*
* h264parse.264 C.1.2 Timing of coded picture removal (equivalent to DTS):
* Tr,n(0) = initial_cpb_removal_delay[ SchedSelIdx ] / 90000
* Tr,n(n) = Tr,n(nb) + Tc * cpb_removal_delay(n)
* where
* Tc = num_units_in_tick / time_scale
*/
if (h264parse->ts_trn_nb != GST_CLOCK_TIME_NONE) {
GST_LOG_OBJECT (h264parse, "buffering based ts");
/* buffering period is present */
if (upstream != GST_CLOCK_TIME_NONE) {
/* If upstream timestamp is valid, we respect it and adjust current
* reference point */
h264parse->ts_trn_nb = upstream -
(GstClockTime) gst_util_uint64_scale_int
(h264parse->sei_cpb_removal_delay * GST_SECOND,
sps->vui_parameters.num_units_in_tick,
sps->vui_parameters.time_scale);
} else {
/* If no upstream timestamp is given, we write in new timestamp */
upstream = h264parse->dts = h264parse->ts_trn_nb +
(GstClockTime) gst_util_uint64_scale_int
(h264parse->sei_cpb_removal_delay * GST_SECOND,
sps->vui_parameters.num_units_in_tick,
sps->vui_parameters.time_scale);
}
} else {
GstClockTime dur;
GST_LOG_OBJECT (h264parse, "duration based ts");
/* naive method: no removal delay specified
* track upstream timestamp and provide best guess frame duration */
dur = gst_util_uint64_scale_int (duration * GST_SECOND,
sps->vui_parameters.num_units_in_tick, sps->vui_parameters.time_scale);
/* sanity check */
if (dur < GST_MSECOND) {
GST_DEBUG_OBJECT (h264parse, "discarding dur %" GST_TIME_FORMAT,
GST_TIME_ARGS (dur));
} else {
*out_dur = dur;
}
}
exit:
if (GST_CLOCK_TIME_IS_VALID (upstream))
*out_ts = h264parse->dts = upstream;
if (GST_CLOCK_TIME_IS_VALID (*out_dur) &&
GST_CLOCK_TIME_IS_VALID (h264parse->dts))
h264parse->dts += *out_dur;
}
static GstFlowReturn
gst_h264_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstH264Parse *h264parse;
GstBuffer *buffer;
guint av;
h264parse = GST_H264_PARSE (parse);
buffer = frame->buffer;
gst_h264_parse_update_src_caps (h264parse, NULL);
/* don't mess with timestamps if provided by upstream,
* particularly since our ts not that good they handle seeking etc */
if (h264parse->do_ts)
gst_h264_parse_get_timestamp (h264parse,
&GST_BUFFER_TIMESTAMP (buffer), &GST_BUFFER_DURATION (buffer),
h264parse->frame_start);
if (h264parse->keyframe)
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
/* replace with transformed AVC output if applicable */
av = gst_adapter_available (h264parse->frame_out);
if (av) {
GstBuffer *buf;
buf = gst_adapter_take_buffer (h264parse->frame_out, av);
gst_buffer_copy_into (buf, buffer, GST_BUFFER_COPY_METADATA, 0, -1);
gst_buffer_replace (&frame->out_buffer, buf);
gst_buffer_unref (buf);
}
return GST_FLOW_OK;
}
/* sends a codec NAL downstream, decorating and transforming as needed.
* No ownership is taken of @nal */
static GstFlowReturn
gst_h264_parse_push_codec_buffer (GstH264Parse * h264parse, GstBuffer * nal,
GstClockTime ts)
{
GstMapInfo map;
gst_buffer_map (nal, &map, GST_MAP_READ);
nal = gst_h264_parse_wrap_nal (h264parse, h264parse->format,
map.data, map.size);
gst_buffer_unmap (nal, &map);
GST_BUFFER_TIMESTAMP (nal) = ts;
GST_BUFFER_DURATION (nal) = 0;
return gst_pad_push (GST_BASE_PARSE_SRC_PAD (h264parse), nal);
}
static GstEvent *
check_pending_key_unit_event (GstEvent * pending_event, GstSegment * segment,
GstClockTime timestamp, guint flags, GstClockTime pending_key_unit_ts)
{
GstClockTime running_time, stream_time;
gboolean all_headers;
guint count;
GstEvent *event = NULL;
g_return_val_if_fail (segment != NULL, NULL);
if (pending_event == NULL)
goto out;
if (GST_CLOCK_TIME_IS_VALID (pending_key_unit_ts) &&
timestamp == GST_CLOCK_TIME_NONE)
goto out;
running_time = gst_segment_to_running_time (segment,
GST_FORMAT_TIME, timestamp);
GST_INFO ("now %" GST_TIME_FORMAT " wanted %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time), GST_TIME_ARGS (pending_key_unit_ts));
if (GST_CLOCK_TIME_IS_VALID (pending_key_unit_ts) &&
running_time < pending_key_unit_ts)
goto out;
if (flags & GST_BUFFER_FLAG_DELTA_UNIT) {
GST_DEBUG ("pending force key unit, waiting for keyframe");
goto out;
}
stream_time = gst_segment_to_stream_time (segment,
GST_FORMAT_TIME, timestamp);
gst_video_event_parse_upstream_force_key_unit (pending_event,
NULL, &all_headers, &count);
event =
gst_video_event_new_downstream_force_key_unit (timestamp, stream_time,
running_time, all_headers, count);
gst_event_set_seqnum (event, gst_event_get_seqnum (pending_event));
out:
return event;
}
static void
gst_h264_parse_prepare_key_unit (GstH264Parse * parse, GstEvent * event)
{
GstClockTime running_time;
guint count;
gboolean have_sps, have_pps;
gint i;
parse->pending_key_unit_ts = GST_CLOCK_TIME_NONE;
gst_event_replace (&parse->force_key_unit_event, NULL);
gst_video_event_parse_downstream_force_key_unit (event,
NULL, NULL, &running_time, NULL, &count);
GST_INFO_OBJECT (parse, "pushing downstream force-key-unit event %d "
"%" GST_TIME_FORMAT " count %d", gst_event_get_seqnum (event),
GST_TIME_ARGS (running_time), count);
gst_pad_push_event (GST_BASE_PARSE_SRC_PAD (parse), event);
have_sps = have_pps = FALSE;
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) {
if (parse->sps_nals[i] != NULL) {
have_sps = TRUE;
break;
}
}
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) {
if (parse->pps_nals[i] != NULL) {
have_pps = TRUE;
break;
}
}
GST_INFO_OBJECT (parse, "preparing key unit, have sps %d have pps %d",
have_sps, have_pps);
/* set push_codec to TRUE so that pre_push_frame sends SPS/PPS again */
parse->push_codec = TRUE;
}
static GstFlowReturn
gst_h264_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstH264Parse *h264parse;
GstBuffer *buffer;
GstEvent *event;
h264parse = GST_H264_PARSE (parse);
buffer = frame->buffer;
if ((event = check_pending_key_unit_event (h264parse->force_key_unit_event,
&parse->segment, GST_BUFFER_TIMESTAMP (buffer),
GST_BUFFER_FLAGS (buffer), h264parse->pending_key_unit_ts))) {
gst_h264_parse_prepare_key_unit (h264parse, event);
}
/* periodic SPS/PPS sending */
if (h264parse->interval > 0 || h264parse->push_codec) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
guint64 diff;
/* init */
if (!GST_CLOCK_TIME_IS_VALID (h264parse->last_report)) {
h264parse->last_report = timestamp;
}
if (h264parse->idr_pos >= 0) {
GST_LOG_OBJECT (h264parse, "IDR nal at offset %d", h264parse->idr_pos);
if (timestamp > h264parse->last_report)
diff = timestamp - h264parse->last_report;
else
diff = 0;
GST_LOG_OBJECT (h264parse,
"now %" GST_TIME_FORMAT ", last SPS/PPS %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp), GST_TIME_ARGS (h264parse->last_report));
GST_DEBUG_OBJECT (h264parse,
"interval since last SPS/PPS %" GST_TIME_FORMAT,
GST_TIME_ARGS (diff));
if (GST_TIME_AS_SECONDS (diff) >= h264parse->interval ||
h264parse->push_codec) {
GstBuffer *codec_nal;
gint i;
GstClockTime new_ts;
/* avoid overwriting a perfectly fine timestamp */
new_ts = GST_CLOCK_TIME_IS_VALID (timestamp) ? timestamp :
h264parse->last_report;
if (h264parse->align == GST_H264_PARSE_ALIGN_NAL) {
/* send separate config NAL buffers */
GST_DEBUG_OBJECT (h264parse, "- sending SPS/PPS");
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) {
if ((codec_nal = h264parse->sps_nals[i])) {
GST_DEBUG_OBJECT (h264parse, "sending SPS nal");
gst_h264_parse_push_codec_buffer (h264parse, codec_nal,
timestamp);
h264parse->last_report = new_ts;
}
}
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) {
if ((codec_nal = h264parse->pps_nals[i])) {
GST_DEBUG_OBJECT (h264parse, "sending PPS nal");
gst_h264_parse_push_codec_buffer (h264parse, codec_nal,
timestamp);
h264parse->last_report = new_ts;
}
}
} else {
/* insert config NALs into AU */
GstByteWriter bw;
GstBuffer *new_buf;
const gboolean bs = h264parse->format == GST_H264_PARSE_FORMAT_BYTE;
const gint nls = 4 - h264parse->nal_length_size;
gboolean ok;
gst_byte_writer_init_with_size (&bw, gst_buffer_get_size (buffer),
FALSE);
ok = gst_byte_writer_put_buffer (&bw, buffer, 0, h264parse->idr_pos);
GST_DEBUG_OBJECT (h264parse, "- inserting SPS/PPS");
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) {
if ((codec_nal = h264parse->sps_nals[i])) {
gsize nal_size = gst_buffer_get_size (codec_nal);
GST_DEBUG_OBJECT (h264parse, "inserting SPS nal");
ok &= gst_byte_writer_put_uint32_be (&bw,
bs ? 1 : (nal_size << (nls * 8)));
ok &= gst_byte_writer_set_pos (&bw,
gst_byte_writer_get_pos (&bw) - nls);
ok &= gst_byte_writer_put_buffer (&bw, codec_nal, 0, nal_size);
h264parse->last_report = new_ts;
}
}
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) {
if ((codec_nal = h264parse->pps_nals[i])) {
gsize nal_size = gst_buffer_get_size (codec_nal);
GST_DEBUG_OBJECT (h264parse, "inserting PPS nal");
ok &= gst_byte_writer_put_uint32_be (&bw,
bs ? 1 : (nal_size << (nls * 8)));
ok &= gst_byte_writer_set_pos (&bw,
gst_byte_writer_get_pos (&bw) - nls);
h264parse->last_report = new_ts;
}
}
ok &=
gst_byte_writer_put_buffer (&bw, buffer, h264parse->idr_pos, -1);
/* collect result and push */
new_buf = gst_byte_writer_reset_and_get_buffer (&bw);
gst_buffer_copy_into (new_buf, buffer, GST_BUFFER_COPY_METADATA, 0,
-1);
/* should already be keyframe/IDR, but it may not have been,
* so mark it as such to avoid being discarded by picky decoder */
GST_BUFFER_FLAG_UNSET (new_buf, GST_BUFFER_FLAG_DELTA_UNIT);
gst_buffer_replace (&frame->out_buffer, new_buf);
gst_buffer_unref (new_buf);
/* some result checking seems to make some compilers happy */
if (G_UNLIKELY (!ok)) {
GST_ERROR_OBJECT (h264parse, "failed to insert SPS/PPS");
}
}
}
/* we pushed whatever we had */
h264parse->push_codec = FALSE;
h264parse->have_sps = FALSE;
h264parse->have_pps = FALSE;
}
}
gst_h264_parse_reset_frame (h264parse);
return GST_FLOW_OK;
}
static gboolean
gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
{
GstH264Parse *h264parse;
GstStructure *str;
const GValue *value;
GstBuffer *codec_data = NULL;
gsize size;
guint format, align, off;
GstH264NalUnit nalu;
GstH264ParserResult parseres;
h264parse = GST_H264_PARSE (parse);
/* reset */
h264parse->push_codec = FALSE;
str = gst_caps_get_structure (caps, 0);
/* accept upstream info if provided */
gst_structure_get_int (str, "width", &h264parse->width);
gst_structure_get_int (str, "height", &h264parse->height);
gst_structure_get_fraction (str, "framerate", &h264parse->fps_num,
&h264parse->fps_den);
gst_structure_get_fraction (str, "pixel-aspect-ratio",
&h264parse->upstream_par_n, &h264parse->upstream_par_d);
/* get upstream format and align from caps */
gst_h264_parse_format_from_caps (caps, &format, &align);
/* packetized video has a codec_data */
if (format != GST_H264_PARSE_FORMAT_BYTE &&
(value = gst_structure_get_value (str, "codec_data"))) {
GstMapInfo map;
guint8 *data;
guint num_sps, num_pps, profile;
gint i;
GST_DEBUG_OBJECT (h264parse, "have packetized h264");
/* make note for optional split processing */
h264parse->packetized = TRUE;
codec_data = gst_value_get_buffer (value);
if (!codec_data)
goto wrong_type;
gst_buffer_map (codec_data, &map, GST_MAP_READ);
data = map.data;
size = map.size;
/* parse the avcC data */
if (size < 8) {
gst_buffer_unmap (codec_data, &map);
goto avcc_too_small;
}
/* parse the version, this must be 1 */
if (data[0] != 1) {
gst_buffer_unmap (codec_data, &map);
goto wrong_version;
}
/* AVCProfileIndication */
/* profile_compat */
/* AVCLevelIndication */
profile = (data[1] << 16) | (data[2] << 8) | data[3];
GST_DEBUG_OBJECT (h264parse, "profile %06x", profile);
/* 6 bits reserved | 2 bits lengthSizeMinusOne */
/* this is the number of bytes in front of the NAL units to mark their
* length */
h264parse->nal_length_size = (data[4] & 0x03) + 1;
GST_DEBUG_OBJECT (h264parse, "nal length size %u",
h264parse->nal_length_size);
num_sps = data[5] & 0x1f;
off = 6;
for (i = 0; i < num_sps; i++) {
parseres = gst_h264_parser_identify_nalu_avc (h264parse->nalparser,
data, off, size, 2, &nalu);
if (parseres != GST_H264_PARSER_OK) {
gst_buffer_unmap (codec_data, &map);
goto avcc_too_small;
}
gst_h264_parse_process_nal (h264parse, &nalu);
off = nalu.offset + nalu.size;
}
num_pps = data[off];
off++;
for (i = 0; i < num_pps; i++) {
parseres = gst_h264_parser_identify_nalu_avc (h264parse->nalparser,
data, off, size, 2, &nalu);
if (parseres != GST_H264_PARSER_OK) {
gst_buffer_unmap (codec_data, &map);
goto avcc_too_small;
}
gst_h264_parse_process_nal (h264parse, &nalu);
off = nalu.offset + nalu.size;
}
gst_buffer_unmap (codec_data, &map);
h264parse->codec_data = gst_buffer_ref (codec_data);
/* if upstream sets codec_data without setting stream-format and alignment, we
* assume stream-format=avc,alignment=au */
if (format == GST_H264_PARSE_FORMAT_NONE)
format = GST_H264_PARSE_FORMAT_AVC;
if (align == GST_H264_PARSE_ALIGN_NONE)
align = GST_H264_PARSE_ALIGN_AU;
} else {
GST_DEBUG_OBJECT (h264parse, "have bytestream h264");
/* nothing to pre-process */
h264parse->packetized = FALSE;
/* we have 4 sync bytes */
h264parse->nal_length_size = 4;
if (format == GST_H264_PARSE_FORMAT_NONE) {
format = GST_H264_PARSE_FORMAT_BYTE;
align = GST_H264_PARSE_ALIGN_AU;
}
}
{
GstCaps *in_caps;
/* prefer input type determined above */
in_caps = gst_caps_new_simple ("video/x-h264",
"parsed", G_TYPE_BOOLEAN, TRUE,
"stream-format", G_TYPE_STRING,
gst_h264_parse_get_string (h264parse, TRUE, format),
"alignment", G_TYPE_STRING,
gst_h264_parse_get_string (h264parse, FALSE, align), NULL);
/* negotiate with downstream, sets ->format and ->align */
gst_h264_parse_negotiate (h264parse, format, in_caps);
gst_caps_unref (in_caps);
}
if (format == h264parse->format && align == h264parse->align) {
gst_base_parse_set_passthrough (parse, TRUE);
/* we did parse codec-data and might supplement src caps */
gst_h264_parse_update_src_caps (h264parse, caps);
} else if (format == GST_H264_PARSE_FORMAT_AVC) {
/* if input != output, and input is avc, must split before anything else */
/* arrange to insert codec-data in-stream if needed.
* src caps are only arranged for later on */
h264parse->push_codec = TRUE;
h264parse->have_sps = FALSE;
h264parse->have_pps = FALSE;
if (h264parse->align == GST_H264_PARSE_ALIGN_NAL)
h264parse->split_packetized = TRUE;
h264parse->packetized = TRUE;
}
return TRUE;
/* ERRORS */
avcc_too_small:
{
GST_DEBUG_OBJECT (h264parse, "avcC size %" G_GSIZE_FORMAT " < 8", size);
goto refuse_caps;
}
wrong_version:
{
GST_DEBUG_OBJECT (h264parse, "wrong avcC version");
goto refuse_caps;
}
wrong_type:
{
GST_DEBUG_OBJECT (h264parse, "wrong codec-data type");
goto refuse_caps;
}
refuse_caps:
{
GST_WARNING_OBJECT (h264parse, "refused caps %" GST_PTR_FORMAT, caps);
return FALSE;
}
}
static GstCaps *
gst_h264_parse_get_caps (GstBaseParse * parse, GstCaps * filter)
{
GstCaps *peercaps, *templ;
GstCaps *res;
templ = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD (parse));
peercaps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (parse));
if (peercaps) {
guint i, n;
peercaps = gst_caps_make_writable (peercaps);
n = gst_caps_get_size (peercaps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (peercaps, i);
gst_structure_remove_field (s, "alignment");
gst_structure_remove_field (s, "stream-format");
gst_structure_remove_field (s, "parsed");
}
res = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (peercaps);
/* Append the template caps because we still want to accept
* caps without any fields in the case upstream does not
* know anything.
*/
gst_caps_append (res, templ);
} else {
res = templ;
}
if (filter) {
GstCaps *tmp = gst_caps_intersect_full (res, filter,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (res);
res = tmp;
}
return res;
}
static gboolean
gst_h264_parse_event (GstBaseParse * parse, GstEvent * event)
{
gboolean res;
GstH264Parse *h264parse = GST_H264_PARSE (parse);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_DOWNSTREAM:
{
GstClockTime timestamp, stream_time, running_time;
gboolean all_headers;
guint count;
if (gst_video_event_is_force_key_unit (event)) {
gst_video_event_parse_downstream_force_key_unit (event,
&timestamp, &stream_time, &running_time, &all_headers, &count);
GST_INFO_OBJECT (h264parse, "received downstream force key unit event, "
"seqnum %d running_time %" GST_TIME_FORMAT
" all_headers %d count %d", gst_event_get_seqnum (event),
GST_TIME_ARGS (running_time), all_headers, count);
if (h264parse->force_key_unit_event) {
GST_INFO_OBJECT (h264parse, "ignoring force key unit event "
"as one is already queued");
} else {
h264parse->pending_key_unit_ts = running_time;
gst_event_replace (&h264parse->force_key_unit_event, event);
}
gst_event_unref (event);
res = TRUE;
} else {
res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
break;
}
break;
}
case GST_EVENT_FLUSH_STOP:
h264parse->dts = GST_CLOCK_TIME_NONE;
h264parse->ts_trn_nb = GST_CLOCK_TIME_NONE;
res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
break;
case GST_EVENT_SEGMENT:
{
const GstSegment *segment;
gst_event_parse_segment (event, &segment);
/* don't try to mess with more subtle cases (e.g. seek) */
if (segment->format == GST_FORMAT_TIME &&
(segment->start != 0 || segment->rate != 1.0
|| segment->applied_rate != 1.0))
h264parse->do_ts = FALSE;
res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
break;
}
default:
res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
break;
}
return res;
}
static gboolean
gst_h264_parse_src_event (GstBaseParse * parse, GstEvent * event)
{
gboolean res;
GstH264Parse *h264parse = GST_H264_PARSE (parse);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
{
GstClockTime running_time;
gboolean all_headers;
guint count;
if (gst_video_event_is_force_key_unit (event)) {
gst_video_event_parse_upstream_force_key_unit (event,
&running_time, &all_headers, &count);
GST_INFO_OBJECT (h264parse, "received upstream force-key-unit event, "
"seqnum %d running_time %" GST_TIME_FORMAT
" all_headers %d count %d", gst_event_get_seqnum (event),
GST_TIME_ARGS (running_time), all_headers, count);
if (all_headers) {
h264parse->pending_key_unit_ts = running_time;
gst_event_replace (&h264parse->force_key_unit_event, event);
}
}
res = GST_BASE_PARSE_CLASS (parent_class)->src_event (parse, event);
break;
}
default:
res = GST_BASE_PARSE_CLASS (parent_class)->src_event (parse, event);
break;
}
return res;
}
static void
gst_h264_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstH264Parse *parse;
parse = GST_H264_PARSE (object);
switch (prop_id) {
case PROP_CONFIG_INTERVAL:
parse->interval = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_h264_parse_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstH264Parse *parse;
parse = GST_H264_PARSE (object);
switch (prop_id) {
case PROP_CONFIG_INTERVAL:
g_value_set_uint (value, parse->interval);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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