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gstreamer/gst/videoparsers/gsth264parse.c
Sebastian Dröge cfb986b6bf h264parse: Add Converter to classification 
This parser can convert between different alignments and stream-formats.
2011-09-06 13:21:28 +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 "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, parsed = (boolean) false"));
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h264, parsed = (boolean) true"));
GST_BOILERPLATE (GstH264Parse, gst_h264_parse, GstBaseParse,
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 gboolean gst_h264_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, 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 GstFlowReturn gst_h264_parse_chain (GstPad * pad, GstBuffer * buffer);
static void
gst_h264_parse_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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>");
GST_DEBUG_CATEGORY_INIT (h264_parse_debug, "h264parse", 0, "h264 parser");
}
static void
gst_h264_parse_class_init (GstH264ParseClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
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->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_h264_parse_check_valid_frame);
parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_h264_parse_parse_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);
}
static void
gst_h264_parse_init (GstH264Parse * h264parse, GstH264ParseClass * g_class)
{
h264parse->frame_out = gst_adapter_new ();
/* retrieve and intercept baseparse.
* Quite HACKish, but fairly OK since it is needed to perform avc packet
* splitting, which is the penultimate de-parsing */
h264parse->parse_chain =
GST_PAD_CHAINFUNC (GST_BASE_PARSE_SINK_PAD (h264parse));
gst_pad_set_chain_function (GST_BASE_PARSE_SINK_PAD (h264parse),
gst_h264_parse_chain);
}
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->nalu.valid = FALSE;
h264parse->nalu.offset = 0;
h264parse->nalu.size = 0;
h264parse->current_off = 0;
h264parse->picture_start = FALSE;
h264parse->update_caps = FALSE;
h264parse->idr_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;
gst_buffer_replace (&h264parse->codec_data, NULL);
h264parse->nal_length_size = 4;
h264parse->packetized = 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;
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);
g_free (h264parse->nalparser);
h264parse->nalparser = NULL;
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)
{
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)
{
GstCaps *caps;
guint format = GST_H264_PARSE_FORMAT_NONE;
guint align = GST_H264_PARSE_ALIGN_NONE;
caps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (h264parse));
GST_DEBUG_OBJECT (h264parse, "allowed caps: %" GST_PTR_FORMAT, caps);
gst_h264_parse_format_from_caps (caps, &format, &align);
if (caps)
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;
}
static GstBuffer *
gst_h264_parse_wrap_nal (GstH264Parse * h264parse, guint format, guint8 * data,
guint size)
{
GstBuffer *buf;
const guint nl = h264parse->nal_length_size;
GST_DEBUG ("Nal length %d %d", size, h264parse->nal_length_size);
buf = gst_buffer_new_and_alloc (size + nl + 4);
if (format == GST_H264_PARSE_FORMAT_AVC) {
GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf), size << (32 - 8 * nl));
} else {
g_assert (nl == 4);
GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf), 1);
}
GST_BUFFER_SIZE (buf) = size + nl;
memcpy (GST_BUFFER_DATA (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 ("Storing sps %u", id);
} else if (naltype == GST_H264_NAL_PPS) {
store_size = GST_H264_MAX_PPS_COUNT;
store = h264parse->pps_nals;
GST_DEBUG ("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_and_alloc (size);
memcpy (GST_BUFFER_DATA (buf), 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;
GstH264SliceHdr slice;
GstH264PPS pps;
GstH264SPS sps;
GstH264SEIMessage sei;
gboolean slcparsed = FALSE;
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;
/* found in stream, no need to forcibly push at start */
h264parse->push_codec = 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;
/* found in stream, no need to forcibly push at start */
h264parse->push_codec = 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;
}
break;
case GST_H264_NAL_SLICE:
case GST_H264_NAL_SLICE_DPA:
case GST_H264_NAL_SLICE_DPB:
case GST_H264_NAL_SLICE_DPC:
slcparsed = TRUE;
if (gst_h264_parser_parse_slice_hdr (nalparser, nalu,
&slice, FALSE, FALSE) == GST_H264_PARSER_ERROR)
return;
/* real frame data */
h264parse->frame_start |= (slice.first_mb_in_slice == 0);
/* 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) */
GST_DEBUG ("Frame start: %i first_mb_in_slice %i", h264parse->frame_start,
slice.first_mb_in_slice);
if (G_LIKELY (!h264parse->push_codec))
break;
/* fall-through */
case GST_H264_NAL_SLICE_IDR:
if (!slcparsed) {
if (gst_h264_parser_parse_slice_hdr (nalparser, nalu,
&slice, FALSE, FALSE) == GST_H264_PARSER_ERROR)
return;
GST_DEBUG ("Frame start: %i first_mb_in_slice %i",
h264parse->frame_start, slice.first_mb_in_slice);
}
/* real frame data */
h264parse->frame_start |= (slice.first_mb_in_slice == 0);
/* mark where config needs to go if interval expired */
/* mind replacement buffer if applicable */
if (h264parse->format == GST_H264_PARSE_FORMAT_AVC)
h264parse->idr_pos = gst_adapter_available (h264parse->frame_out);
else
h264parse->idr_pos = nalu->offset - 4;
GST_DEBUG_OBJECT (h264parse, "marking IDR in frame at offset %d",
h264parse->idr_pos);
GST_DEBUG ("first MB: %u, slice type: %u", slice.first_mb_in_slice,
slice.type);
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->format == GST_H264_PARSE_FORMAT_AVC) {
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 ("Parsing collecte 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;
if (h264parse->align == GST_H264_PARSE_ALIGN_NAL) {
return TRUE;
}
/* 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;
}
/* FIXME move into baseparse, or anything equivalent;
* see https://bugzilla.gnome.org/show_bug.cgi?id=650093 */
#define GST_BASE_PARSE_FRAME_FLAG_PARSING 0x10000
static gboolean
gst_h264_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GstBuffer *buffer = frame->buffer;
guint8 *data;
guint size, current_off = 0;
gboolean drain;
GstH264NalParser *nalparser = h264parse->nalparser;
GstH264NalUnit nalu = h264parse->nalu;
/* expect at least 3 bytes startcode == sc, and 2 bytes NALU payload */
if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < 5))
return FALSE;
/* need to configure aggregation */
if (G_UNLIKELY (h264parse->format == GST_H264_PARSE_FORMAT_NONE))
gst_h264_parse_negotiate (h264parse);
/* avoid stale cached parsing state */
if (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_PARSING)) {
GST_LOG_OBJECT (h264parse, "parsing new frame");
gst_h264_parse_reset_frame (h264parse);
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_PARSING;
} else {
GST_LOG_OBJECT (h264parse, "resuming frame parsing");
}
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
drain = GST_BASE_PARSE_DRAINING (parse);
current_off = h264parse->current_off;
GST_DEBUG ("Last parse position %u", current_off);
while (TRUE) {
switch (gst_h264_parser_identify_nalu (nalparser, data, current_off,
size, &nalu)) {
case GST_H264_PARSER_OK:
GST_DEBUG ("Complete nal found. %u Off: %u, Size: %u",
current_off, nalu.offset, nalu.size);
current_off = nalu.offset + nalu.size;
GST_DEBUG ("CURENT OFF. %u, %u", current_off, nalu.offset + nalu.size);
if (!h264parse->nalu.size && !h264parse->nalu.valid)
h264parse->nalu = nalu;
break;
case GST_H264_PARSER_BROKEN_LINK:
return FALSE;
case GST_H264_PARSER_ERROR:
current_off = size - 3;
goto parsing_error;
case GST_H264_PARSER_NO_NAL:
current_off = size - 3;
goto more;
case GST_H264_PARSER_BROKEN_DATA:
GST_WARNING_OBJECT (h264parse, "input stream is corrupt; "
"it contains a NAL unit of length %d", nalu.size);
/* 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 (nalu.sc_offset == h264parse->nalu.sc_offset) {
*skipsize = nalu.offset;
GST_DEBUG ("Skiping broken nal");
return FALSE;
} else {
nalu.size = 0;
goto end;
}
case GST_H264_PARSER_NO_NAL_END:
GST_DEBUG ("Not a complete nal found at offset %u", nalu.offset);
current_off = nalu.sc_offset;
/* We keep the reference to this nal so we start over the parsing
* here */
if (!h264parse->nalu.size && !h264parse->nalu.valid)
h264parse->nalu = nalu;
if (drain) {
GST_DEBUG ("Drainning NAL %u %u %u", size, h264parse->nalu.offset,
h264parse->nalu.size);
/* Can't parse the nalu */
if (size - h264parse->nalu.offset < 2) {
*skipsize = nalu.offset;
return FALSE;
}
/* We parse it anyway */
nalu.size = size - nalu.offset;
break;
}
goto more;
}
current_off = nalu.offset + nalu.size;
GST_DEBUG ("%p Complete nal found. Off: %u, Size: %u", data, nalu.offset,
nalu.size);
gst_h264_parse_process_nal (h264parse, &nalu);
if (gst_h264_parse_collect_nal (h264parse, data, size, &nalu) || drain)
break;
}
end:
/* FIXME this shouldnt be needed */
if (h264parse->nalu.sc_offset > 0 && data[h264parse->nalu.sc_offset - 1] == 0)
h264parse->nalu.sc_offset--;
*skipsize = h264parse->nalu.sc_offset;
*framesize = nalu.offset + nalu.size - h264parse->nalu.sc_offset; /* CHECKME */
h264parse->current_off = current_off;
return TRUE;
parsing_error:
GST_DEBUG ("Error parsing Nal Unit");
more:
/* ask for best next available */
*framesize = G_MAXUINT;
if (!h264parse->nalu.size) {
/* skip up to initial startcode */
*skipsize = h264parse->nalu.sc_offset;
} else {
*skipsize = 0;
}
/* Restart parsing from here next time */
h264parse->current_off = current_off;
return FALSE;
}
/* 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;
guint8 *data;
/* only nal payload in stored nals */
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++) {
if ((nal = h264parse->sps_nals[i])) {
num_sps++;
/* size bytes also count */
sps_size += GST_BUFFER_SIZE (nal) + 2;
if (GST_BUFFER_SIZE (nal) >= 4) {
found = TRUE;
profile_idc = (GST_BUFFER_DATA (nal))[1];
profile_comp = (GST_BUFFER_DATA (nal))[2];
level_idc = (GST_BUFFER_DATA (nal))[3];
}
}
}
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_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_and_alloc (5 + 1 + sps_size + 1 + pps_size);
data = GST_BUFFER_DATA (buf);
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 | (4 - 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])) {
GST_WRITE_UINT16_BE (data, GST_BUFFER_SIZE (nal));
memcpy (data + 2, GST_BUFFER_DATA (nal), GST_BUFFER_SIZE (nal));
data += 2 + GST_BUFFER_SIZE (nal);
}
}
data[0] = num_pps;
data++;
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++) {
if ((nal = h264parse->pps_nals[i])) {
GST_WRITE_UINT16_BE (data, GST_BUFFER_SIZE (nal));
memcpy (data + 2, GST_BUFFER_DATA (nal), GST_BUFFER_SIZE (nal));
data += 2 + GST_BUFFER_SIZE (nal);
}
}
return buf;
}
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_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 = caps;
else
sink_caps = GST_PAD_CAPS (GST_BASE_PARSE_SINK_PAD (h264parse));
/* carry over input caps as much as possible; override with our own stuff */
if (sink_caps)
gst_caps_ref (sink_caps);
else
sink_caps = gst_caps_new_simple ("video/x-h264", NULL);
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) {
if (GST_BUFFER_SIZE (buf) != GST_BUFFER_SIZE (h264parse->codec_data) ||
memcmp (GST_BUFFER_DATA (buf),
GST_BUFFER_DATA (h264parse->codec_data), GST_BUFFER_SIZE (buf)))
modified = TRUE;
} 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 || h264parse->fps_num != sps->fps_num
|| h264parse->fps_den != sps->fps_den || 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);
h264parse->height = sps->height;
h264parse->width = sps->width;
/* but not necessarily or reliably this */
if ((!h264parse->fps_num || !h264parse->fps_den) &&
sps->fps_num > 0 && sps->fps_den > 0) {
gst_caps_set_simple (caps, "framerate",
GST_TYPE_FRACTION, sps->fps_num, sps->fps_den, NULL);
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);
}
}
if (caps) {
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);
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);
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_metadata (buf, buffer, GST_BUFFER_COPY_ALL);
gst_buffer_replace (&frame->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)
{
nal = gst_h264_parse_wrap_nal (h264parse, h264parse->format,
GST_BUFFER_DATA (nal), GST_BUFFER_SIZE (nal));
GST_BUFFER_TIMESTAMP (nal) = ts;
GST_BUFFER_DURATION (nal) = 0;
gst_buffer_set_caps (nal, GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (h264parse)));
return gst_pad_push (GST_BASE_PARSE_SRC_PAD (h264parse), nal);
}
static GstFlowReturn
gst_h264_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstH264Parse *h264parse;
GstBuffer *buffer;
h264parse = GST_H264_PARSE (parse);
buffer = frame->buffer;
/* 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;
gst_byte_writer_init_with_size (&bw, GST_BUFFER_SIZE (buffer), FALSE);
gst_byte_writer_put_data (&bw, GST_BUFFER_DATA (buffer),
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])) {
GST_DEBUG_OBJECT (h264parse, "inserting SPS nal");
gst_byte_writer_put_uint32_be (&bw,
bs ? 1 : GST_BUFFER_SIZE (codec_nal));
gst_byte_writer_put_data (&bw, GST_BUFFER_DATA (codec_nal),
GST_BUFFER_SIZE (codec_nal));
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, "inserting PPS nal");
gst_byte_writer_put_uint32_be (&bw,
bs ? 1 : GST_BUFFER_SIZE (codec_nal));
gst_byte_writer_put_data (&bw, GST_BUFFER_DATA (codec_nal),
GST_BUFFER_SIZE (codec_nal));
h264parse->last_report = new_ts;
}
}
gst_byte_writer_put_data (&bw,
GST_BUFFER_DATA (buffer) + h264parse->idr_pos,
GST_BUFFER_SIZE (buffer) - h264parse->idr_pos);
/* collect result and push */
new_buf = gst_byte_writer_reset_and_get_buffer (&bw);
gst_buffer_copy_metadata (new_buf, buffer, GST_BUFFER_COPY_ALL);
gst_buffer_replace (&frame->buffer, new_buf);
gst_buffer_unref (new_buf);
}
}
/* we pushed whatever we had */
h264parse->push_codec = 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;
guint size, 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);
/* 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"))) {
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;
data = GST_BUFFER_DATA (codec_data);
size = GST_BUFFER_SIZE (codec_data);
/* parse the avcC data */
if (size < 7)
goto avcc_too_small;
/* parse the version, this must be 1 */
if (data[0] != 1)
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 %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 - off, 2, &nalu);
if (parseres != GST_H264_PARSER_OK)
goto avcc_too_small;
gst_h264_parse_process_nal (h264parse, &nalu);
off = nalu.offset + nalu.size;
}
num_pps = data[0];
data++;
size++;
for (i = 0; i < num_pps; i++) {
parseres = gst_h264_parser_identify_nalu_avc (h264parse->nalparser,
data, off, size - off, 2, &nalu);
if (parseres != GST_H264_PARSER_OK) {
goto avcc_too_small;
}
gst_h264_parse_process_nal (h264parse, &nalu);
off = nalu.offset + nalu.size;
}
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;
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;
}
}
/* negotiate with downstream, sets ->format and ->align */
gst_h264_parse_negotiate (h264parse);
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->split_packetized = TRUE;
h264parse->packetized = TRUE;
}
return TRUE;
/* ERRORS */
avcc_too_small:
{
GST_DEBUG_OBJECT (h264parse, "avcC size %u < 7", 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 GstFlowReturn
gst_h264_parse_chain (GstPad * pad, GstBuffer * buffer)
{
GstH264Parse *h264parse = GST_H264_PARSE (GST_PAD_PARENT (pad));
if (h264parse->packetized && buffer) {
GstByteReader br;
GstBuffer *sub;
GstFlowReturn ret = GST_FLOW_OK;
guint32 len;
GstH264NalUnit nalu;
const guint nl = h264parse->nal_length_size;
GST_LOG_OBJECT (h264parse, "processing packet buffer of size %d",
GST_BUFFER_SIZE (buffer));
gst_byte_reader_init_from_buffer (&br, buffer);
while (ret == GST_FLOW_OK && gst_byte_reader_get_remaining (&br)) {
GST_DEBUG_OBJECT (h264parse, "AVC nal offset %d",
gst_byte_reader_get_pos (&br));
if (gst_byte_reader_get_remaining (&br) < nl)
goto parse_failed;
switch (nl) {
case 4:
len = gst_byte_reader_get_uint32_be_unchecked (&br);
break;
case 3:
len = gst_byte_reader_get_uint24_be_unchecked (&br);
break;
case 2:
len = gst_byte_reader_get_uint16_be_unchecked (&br);
break;
case 1:
len = gst_byte_reader_get_uint8_unchecked (&br);
break;
default:
goto not_negotiated;
}
GST_DEBUG_OBJECT (h264parse, "AVC nal size %d", len);
if (gst_byte_reader_get_remaining (&br) < len)
goto parse_failed;
if (h264parse->split_packetized) {
/* convert to NAL aligned byte stream input */
sub = gst_h264_parse_wrap_nal (h264parse, GST_H264_PARSE_FORMAT_BYTE,
(guint8 *) gst_byte_reader_get_data_unchecked (&br, len), len);
/* at least this should make sense */
GST_BUFFER_TIMESTAMP (sub) = GST_BUFFER_TIMESTAMP (buffer);
GST_LOG_OBJECT (h264parse, "pushing NAL of size %d", len);
ret = h264parse->parse_chain (pad, sub);
} else {
/* pass-through: no looking for frames (and nal processing),
* so need to parse to collect data here */
/* NOTE: so if it is really configured to do so,
* pre_push can/will still insert codec-data at intervals,
* which is not really pure pass-through, but anyway ... */
gst_h264_parser_identify_nalu (h264parse->nalparser,
GST_BUFFER_DATA (buffer), gst_byte_reader_get_pos (&br) - nl,
GST_BUFFER_SIZE (buffer), &nalu);
gst_h264_parse_process_nal (h264parse, &nalu);
gst_byte_reader_skip_unchecked (&br, len);
}
}
if (h264parse->split_packetized) {
gst_buffer_unref (buffer);
return ret;
} else {
/* nal processing in pass-through might have collected stuff;
* ensure nothing happens with this later on */
gst_adapter_clear (h264parse->frame_out);
}
}
exit:
return h264parse->parse_chain (pad, buffer);
/* ERRORS */
not_negotiated:
{
GST_DEBUG_OBJECT (h264parse, "insufficient data to split input");
gst_buffer_unref (buffer);
return GST_FLOW_NOT_NEGOTIATED;
}
parse_failed:
{
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");
goto exit;
}
}
}
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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