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gstreamer/gst/videoparsers/gsth264parse.c
Mark Nauwelaerts d0b942980e videoparsers: add h264parse 
Functionally equivalent to (legacy)h264parse and re-uses the latter's low
level NAL parsing, but otherwise based on GstBaseParse, and replacing
some property configuration with caps negotiation.
2011-01-28 12:50:25 +01:00

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/* GStreamer H.264 Parser
* Copyright (C) <2010> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) <2010> Collabora Multimedia
* Copyright (C) <2010> Nokia Corporation
*
* 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 "gsth264parse.h"
#include <string.h>
GST_DEBUG_CATEGORY (h264_parse_debug);
#define GST_CAT_DEFAULT h264_parse_debug
#define DEFAULT_SPLIT_PACKETIZED FALSE
#define DEFAULT_CONFIG_INTERVAL (0)
enum
{
PROP_0,
PROP_SPLIT_PACKETIZED,
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, GstElement, 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/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_SPLIT_PACKETIZED,
g_param_spec_boolean ("split-packetized", "Split packetized",
"Split NAL units of packetized streams", DEFAULT_SPLIT_PACKETIZED,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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);
}
static void
gst_h264_parse_reset_frame (GstH264Parse * h264parse)
{
/* done parsing; reset state */
h264parse->last_nal_pos = 0;
h264parse->next_sc_pos = 0;
h264parse->picture_start = FALSE;
h264parse->update_caps = FALSE;
h264parse->idr_pos = -1;
h264parse->keyframe = FALSE;
h264parse->frame_start = FALSE;
}
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 ("Start");
gst_h264_parse_reset (h264parse);
gst_h264_params_create (&h264parse->params, GST_ELEMENT (h264parse));
gst_base_parse_set_min_frame_size (parse, 512);
return TRUE;
}
static gboolean
gst_h264_parse_stop (GstBaseParse * parse)
{
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GST_DEBUG ("Stop");
gst_h264_parse_reset (h264parse);
gst_h264_params_free (h264parse->params);
h264parse->params = 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";
}
}
}
/* 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);
if (caps && gst_caps_get_size (caps) > 0) {
GstStructure *s = gst_caps_get_structure (caps, 0);
const gchar *str = NULL;
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;
} else {
GST_DEBUG_OBJECT (h264parse, "unknown stream-format: %s", str);
}
}
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;
} else {
GST_DEBUG_OBJECT (h264parse, "unknown alignment: %s", str);
}
}
}
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;
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;
}
/* 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, guint8 * data,
gint sc_pos, gint nal_pos, guint nal_size)
{
guint nal_type;
g_return_if_fail (nal_size >= 2);
g_return_if_fail (nal_pos - sc_pos > 0 && nal_pos - sc_pos <= 4);
/* lower layer collects params */
gst_h264_params_parse_nal (h264parse->params, data + nal_pos, nal_size);
/* we have a peek as well */
nal_type = data[nal_pos] & 0x1f;
h264parse->keyframe |= NAL_TYPE_IS_KEY (nal_type);
switch (nal_type) {
case NAL_SPS:
case NAL_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;
break;
case NAL_SLICE:
case NAL_SLICE_DPA:
case NAL_SLICE_DPB:
case NAL_SLICE_DPC:
/* real frame data */
h264parse->frame_start |= (h264parse->params->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) */
if (G_LIKELY (!h264parse->push_codec))
break;
/* fall-through */
case NAL_SLICE_IDR:
/* real frame data */
h264parse->frame_start |= (h264parse->params->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 = sc_pos;
GST_DEBUG_OBJECT (h264parse, "marking IDR in frame at offset %d",
h264parse->idr_pos);
break;
}
/* 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,
data + nal_pos, nal_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, guint8 * nal,
guint8 * next_nal)
{
gint nal_type;
gboolean complete;
if (h264parse->align == GST_H264_PARSE_ALIGN_NAL)
return TRUE;
/* determine if AU complete */
nal_type = nal[0] & 0x1f;
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 == 1 || nal_type == 2 || nal_type == 5);
/* 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 = next_nal[0] & 0x1f;
GST_LOG_OBJECT (h264parse, "next nal type: %d", nal_type);
complete = h264parse->picture_start && (nal_type >= 6 && nal_type <= 9);
complete |= h264parse->picture_start &&
(nal_type == 1 || nal_type == 2 || nal_type == 5) &&
/* first_mb_in_slice == 0 considered start of frame */
(next_nal[1] & 0x80);
GST_LOG_OBJECT (h264parse, "au complete: %d", complete);
return complete;
}
/* finds next startcode == 00 00 01, along with a subsequent byte */
static guint
gst_h264_parse_find_sc (GstBuffer * buffer, guint skip)
{
GstByteReader br;
guint sc_pos = -1;
gst_byte_reader_init_from_buffer (&br, buffer);
/* NALU not empty, so we can at least expect 1 (even 2) bytes following sc */
sc_pos = gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100,
skip, gst_byte_reader_get_remaining (&br) - skip);
return sc_pos;
}
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;
gint sc_pos, nal_pos, next_sc_pos, next_nal_pos;
guint8 *data;
guint size;
gboolean drain;
/* 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);
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
GST_LOG_OBJECT (h264parse, "last_nal_pos: %d, last_scan_pos %d",
h264parse->last_nal_pos, h264parse->next_sc_pos);
nal_pos = h264parse->last_nal_pos;
next_sc_pos = h264parse->next_sc_pos;
if (!next_sc_pos) {
sc_pos = gst_h264_parse_find_sc (buffer, 0);
if (sc_pos == -1) {
/* SC not found, need more data */
sc_pos = GST_BUFFER_SIZE (buffer) - 3;
goto more;
}
nal_pos = sc_pos + 3;
next_sc_pos = nal_pos;
/* sc might have 2 or 3 0-bytes */
if (sc_pos > 0 && data[sc_pos - 1] == 00)
sc_pos--;
GST_LOG_OBJECT (h264parse, "found sc at offset %d", sc_pos);
} else {
/* previous checks already arrange sc at start */
sc_pos = 0;
}
drain = GST_BASE_PARSE_FRAME_DRAIN (frame);
while (TRUE) {
gint prev_sc_pos;
next_sc_pos = gst_h264_parse_find_sc (buffer, next_sc_pos);
if (next_sc_pos == -1) {
GST_LOG_OBJECT (h264parse, "no next sc");
if (drain) {
/* FLUSH/EOS, it's okay if we can't find the next frame */
next_sc_pos = size;
next_nal_pos = size;
} else {
next_sc_pos = size - 3;
goto more;
}
} else {
next_nal_pos = next_sc_pos + 3;
if (data[next_sc_pos - 1] == 00)
next_sc_pos--;
GST_LOG_OBJECT (h264parse, "found next sc at offset %d", next_sc_pos);
/* need at least 1 more byte of next NAL */
if (!drain && (next_nal_pos == size - 1))
goto more;
}
/* determine nal's sc position */
prev_sc_pos = nal_pos - 3;
g_assert (prev_sc_pos >= 0);
if (prev_sc_pos > 0 && data[prev_sc_pos - 1] == 0)
prev_sc_pos--;
/* already consume and gather info from NAL */
gst_h264_parse_process_nal (h264parse, data, prev_sc_pos, nal_pos,
next_sc_pos - nal_pos);
if (next_nal_pos >= size - 1 ||
gst_h264_parse_collect_nal (h264parse, data + nal_pos,
data + next_nal_pos))
break;
/* move along */
next_sc_pos = nal_pos = next_nal_pos;
}
*skipsize = sc_pos;
*framesize = next_sc_pos - sc_pos;
return TRUE;
more:
/* Ask for 1024 bytes more - this is an arbitrary choice */
gst_base_parse_set_min_frame_size (parse, GST_BUFFER_SIZE (buffer) + 1024);
/* skip up to initial startcode */
*skipsize = sc_pos;
/* resume scanning here next time */
h264parse->last_nal_pos = nal_pos;
h264parse->next_sc_pos = next_sc_pos;
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 < MAX_SPS_COUNT; i++) {
if ((nal = h264parse->params->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 < MAX_PPS_COUNT; i++) {
if ((nal = h264parse->params->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 < MAX_SPS_COUNT; i++) {
if ((nal = h264parse->params->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 < MAX_PPS_COUNT; i++) {
if ((nal = h264parse->params->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)
{
GstH264ParamsSPS *sps;
GstCaps *caps = NULL, *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;
/* carry over input caps as much as possible; override with our own stuff */
sink_caps = GST_PAD_CAPS (GST_BASE_PARSE_SINK_PAD (h264parse));
if (sink_caps)
gst_caps_ref (sink_caps);
else
sink_caps = gst_caps_new_simple ("video/x-h264", NULL);
sps = h264parse->params->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;
}
}
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_props (GST_BASE_PARSE (h264parse),
h264parse->fps_num, h264parse->fps_den, 0, 0);
}
}
if (caps) {
gst_caps_set_simple (caps, "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 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);
gst_h264_params_get_timestamp (h264parse->params,
&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);
}
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 < MAX_SPS_COUNT; i++) {
if ((codec_nal = h264parse->params->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 < MAX_PPS_COUNT; i++) {
if ((codec_nal = h264parse->params->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 < MAX_SPS_COUNT; i++) {
if ((codec_nal = h264parse->params->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 < MAX_PPS_COUNT; i++) {
if ((codec_nal = h264parse->params->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);
}
}
/* 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 *buffer = NULL;
guint size;
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);
/* packetized video has a codec_data */
if ((value = gst_structure_get_value (str, "codec_data"))) {
guint8 *data;
guint num_sps, num_pps, profile, len;
gint i;
GST_DEBUG_OBJECT (h264parse, "have packetized h264");
/* make note for optional split processing */
h264parse->packetized = TRUE;
buffer = gst_value_get_buffer (value);
if (!buffer)
goto wrong_type;
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
/* 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;
data += 6;
size -= 6;
for (i = 0; i < num_sps; i++) {
len = GST_READ_UINT16_BE (data);
if (size < len + 2 || len < 2)
goto avcc_too_small;
/* digest for later reference */
gst_h264_parse_process_nal (h264parse, data, 0, 2, len);
data += len + 2;
size -= len + 2;
}
num_pps = data[0];
data++;
size++;
for (i = 0; i < num_pps; i++) {
len = GST_READ_UINT16_BE (data);
if (size < len + 2 || len < 2)
goto avcc_too_small;
/* digest for later reference */
gst_h264_parse_process_nal (h264parse, data, 0, 2, len);
data += len + 2;
size -= len + 2;
}
} 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 (h264parse->packetized) {
if (h264parse->split_packetized) {
GST_DEBUG_OBJECT (h264parse,
"converting AVC to nal bytestream prior to parsing");
/* negotiate behaviour with upstream */
gst_h264_parse_negotiate (h264parse);
if (h264parse->format == GST_H264_PARSE_FORMAT_BYTE) {
/* arrange to insert codec-data in-stream if needed */
h264parse->push_codec = h264parse->packetized;
}
} else {
GST_DEBUG_OBJECT (h264parse, "passing on packetized AVC");
/* no choice to negotiate */
h264parse->format = GST_H264_PARSE_FORMAT_AVC;
h264parse->align = GST_H264_PARSE_ALIGN_AU;
/* fallback codec-data */
h264parse->codec_data = gst_buffer_ref (buffer);
/* pass through unharmed, though _chain will parse a bit */
gst_base_parse_set_format (parse,
GST_BASE_PARSE_FORMAT_PASSTHROUGH, TRUE);
/* we did parse codec-data and might supplement src caps */
gst_h264_parse_update_src_caps (h264parse);
}
}
/* src caps are only arranged for later on */
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;
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;
break;
}
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_parse_process_nal (h264parse,
GST_BUFFER_DATA (buffer), gst_byte_reader_get_pos (&br) - nl,
gst_byte_reader_get_pos (&br), len);
gst_byte_reader_skip_unchecked (&br, len);
}
}
if (h264parse->split_packetized)
return ret;
}
exit:
/* nal processing in pass-through might have collected stuff;
* ensure nothing happens with this later on */
gst_adapter_clear (h264parse->frame_out);
return h264parse->parse_chain (pad, buffer);
/* ERRORS */
not_negotiated:
{
GST_DEBUG_OBJECT (h264parse, "insufficient data to split input");
return GST_FLOW_NOT_NEGOTIATED;
}
parse_failed:
{
if (h264parse->split_packetized) {
GST_ELEMENT_ERROR (h264parse, STREAM, FAILED, (NULL),
("invalid AVC input data"));
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_SPLIT_PACKETIZED:
parse->split_packetized = g_value_get_boolean (value);
break;
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_SPLIT_PACKETIZED:
g_value_set_boolean (value, parse->split_packetized);
break;
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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