gstreamer/gst/rtp/gstrtpvp8pay.c

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/*
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* gstrtpvp8pay.c - Source for GstRtpVP8Pay
* Copyright (C) 2011 Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) 2011 Collabora Ltd.
* Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gst/base/gstbitreader.h>
#include <gst/rtp/gstrtppayloads.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "dboolhuff.h"
#include "gstrtpvp8pay.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_vp8_pay_debug);
#define GST_CAT_DEFAULT gst_rtp_vp8_pay_debug
#define DEFAULT_PICTURE_ID_MODE VP8_PAY_PICTURE_ID_7BITS
static GstFlowReturn gst_rtp_vp8_pay_handle_buffer (GstRTPBasePayload * payload,
GstBuffer * buffer);
static gboolean gst_rtp_vp8_pay_sink_event (GstRTPBasePayload * payload,
GstEvent * event);
static gboolean gst_rtp_vp8_pay_set_caps (GstRTPBasePayload * payload,
GstCaps * caps);
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G_DEFINE_TYPE (GstRtpVP8Pay, gst_rtp_vp8_pay, GST_TYPE_RTP_BASE_PAYLOAD);
static GstStaticPadTemplate gst_rtp_vp8_pay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ","
"clock-rate = (int) 90000, encoding-name = (string) \"VP8-DRAFT-IETF-01\""));
static GstStaticPadTemplate gst_rtp_vp8_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp8"));
static void
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gst_rtp_vp8_pay_init (GstRtpVP8Pay * obj)
{
/* TODO: Make it configurable */
obj->picture_id_mode = DEFAULT_PICTURE_ID_MODE;
if (obj->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS)
obj->picture_id = g_random_int_range (0, G_MAXUINT8) & 0x7F;
else if (obj->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS)
obj->picture_id = g_random_int_range (0, G_MAXUINT16) & 0x7FFF;
}
static void
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gst_rtp_vp8_pay_class_init (GstRtpVP8PayClass * gst_rtp_vp8_pay_class)
{
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GstElementClass *element_class = GST_ELEMENT_CLASS (gst_rtp_vp8_pay_class);
GstRTPBasePayloadClass *pay_class =
GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_vp8_pay_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp8_pay_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp8_pay_src_template));
gst_element_class_set_static_metadata (element_class, "RTP VP8 payloader",
"Codec/Payloader/Network/RTP",
"Puts VP8 video in RTP packets)", "Sjoerd Simons <sjoerd@luon.net>");
pay_class->handle_buffer = gst_rtp_vp8_pay_handle_buffer;
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pay_class->sink_event = gst_rtp_vp8_pay_sink_event;
pay_class->set_caps = gst_rtp_vp8_pay_set_caps;
GST_DEBUG_CATEGORY_INIT (gst_rtp_vp8_pay_debug, "rtpvp8pay", 0,
"VP8 Video RTP Payloader");
}
static gboolean
gst_rtp_vp8_pay_parse_frame (GstRtpVP8Pay * self, GstBuffer * buffer)
{
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GstBitReader *reader = NULL;
guint8 *data;
gsize size;
GstMapInfo map;
int i;
gboolean keyframe;
guint32 partition0_size;
guint8 version;
guint8 tmp8 = 0;
guint8 partitions;
guint offset;
BOOL_DECODER bc;
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guint8 *pdata;
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if (G_UNLIKELY (gst_buffer_get_size (buffer) < 3))
goto error;
if (!gst_buffer_map (buffer, &map, GST_MAP_READ) || !map.data)
goto error;
data = map.data;
size = map.size;
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reader = gst_bit_reader_new (data, size);
self->is_keyframe = keyframe = ((data[0] & 0x1) == 0);
version = (data[0] >> 1) & 0x7;
if (G_UNLIKELY (version > 3)) {
GST_ERROR_OBJECT (self, "Unknown VP8 version %u", version);
goto error;
}
/* keyframe, version and show_frame use 5 bits */
partition0_size = data[2] << 11 | data[1] << 3 | (data[0] >> 5);
/* Include the uncompressed data blob in the first partition */
offset = keyframe ? 10 : 3;
partition0_size += offset;
if (!gst_bit_reader_skip (reader, 24))
goto error;
if (keyframe) {
/* check start tag: 0x9d 0x01 0x2a */
if (!gst_bit_reader_get_bits_uint8 (reader, &tmp8, 8) || tmp8 != 0x9d)
goto error;
if (!gst_bit_reader_get_bits_uint8 (reader, &tmp8, 8) || tmp8 != 0x01)
goto error;
if (!gst_bit_reader_get_bits_uint8 (reader, &tmp8, 8) || tmp8 != 0x2a)
goto error;
/* Skip horizontal size code (16 bits) vertical size code (16 bits) */
if (!gst_bit_reader_skip (reader, 32))
goto error;
}
offset = keyframe ? 10 : 3;
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vp8dx_start_decode (&bc, data + offset, size - offset);
if (keyframe) {
/* color space (1 bit) and clamping type (1 bit) */
vp8dx_decode_bool (&bc, 0x80);
vp8dx_decode_bool (&bc, 0x80);
}
/* segmentation_enabled */
if (vp8dx_decode_bool (&bc, 0x80)) {
guint8 update_mb_segmentation_map = vp8dx_decode_bool (&bc, 0x80);
guint8 update_segment_feature_data = vp8dx_decode_bool (&bc, 0x80);
if (update_segment_feature_data) {
/* skip segment feature mode */
vp8dx_decode_bool (&bc, 0x80);
/* quantizer update */
for (i = 0; i < 4; i++) {
/* skip flagged quantizer value (7 bits) and sign (1 bit) */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 8);
}
/* loop filter update */
for (i = 0; i < 4; i++) {
/* skip flagged lf update value (6 bits) and sign (1 bit) */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 7);
}
}
if (update_mb_segmentation_map) {
/* segment prob update */
for (i = 0; i < 3; i++) {
/* skip flagged segment prob */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 8);
}
}
}
/* skip filter type (1 bit), loop filter level (6 bits) and
* sharpness level (3 bits) */
vp8_decode_value (&bc, 1);
vp8_decode_value (&bc, 6);
vp8_decode_value (&bc, 3);
/* loop_filter_adj_enabled */
if (vp8dx_decode_bool (&bc, 0x80)) {
/* delta update */
if (vp8dx_decode_bool (&bc, 0x80)) {
for (i = 0; i < 8; i++) {
/* 8 updates, 1 bit indicate whether there is one and if follow by a
* 7 bit update */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 7);
}
}
}
if (vp8dx_bool_error (&bc))
goto error;
tmp8 = vp8_decode_value (&bc, 2);
partitions = 1 << tmp8;
/* Check if things are still sensible */
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if (partition0_size + (partitions - 1) * 3 >= size)
goto error;
/* partition data is right after the mode partition */
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pdata = data + partition0_size;
/* Set up mapping */
self->n_partitions = partitions + 1;
self->partition_offset[0] = 0;
self->partition_size[0] = partition0_size + (partitions - 1) * 3;
self->partition_offset[1] = self->partition_size[0];
for (i = 1; i < partitions; i++) {
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guint psize = (pdata[2] << 16 | pdata[1] << 8 | pdata[0]);
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pdata += 3;
self->partition_size[i] = psize;
self->partition_offset[i + 1] = self->partition_offset[i] + psize;
}
/* Check that our partition offsets and sizes don't go outsize the buffer
* size. */
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if (self->partition_offset[i] >= size)
goto error;
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self->partition_size[i] = size - self->partition_offset[i];
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self->partition_offset[i + 1] = size;
gst_bit_reader_free (reader);
gst_buffer_unmap (buffer, &map);
return TRUE;
error:
GST_DEBUG ("Failed to parse frame");
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if (reader) {
gst_bit_reader_free (reader);
gst_buffer_unmap (buffer, &map);
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}
return FALSE;
}
static guint
gst_rtp_vp8_offset_to_partition (GstRtpVP8Pay * self, guint offset)
{
int i;
for (i = 0; i < self->n_partitions; i++) {
if (offset >= self->partition_offset[i] &&
offset < self->partition_offset[i + 1])
return i;
}
return i;
}
static gsize
gst_rtp_vp8_calc_header_len (GstRtpVP8Pay * self)
{
switch (self->picture_id_mode) {
case VP8_PAY_PICTURE_ID_7BITS:
return 3;
case VP8_PAY_PICTURE_ID_15BITS:
return 4;
case VP8_PAY_NO_PICTURE_ID:
default:
return 1;
}
}
static gsize
gst_rtp_vp8_calc_payload_len (GstRtpVP8Pay * self)
{
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GstRTPBasePayload *payload = GST_RTP_BASE_PAYLOAD (self);
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return gst_rtp_buffer_calc_payload_len (GST_RTP_BASE_PAYLOAD_MTU (payload) -
gst_rtp_vp8_calc_header_len (self), 0, 0);
}
/* When growing the vp8 header keep gst_rtp_vp8_calc_payload_len in sync */
static GstBuffer *
gst_rtp_vp8_create_header_buffer (GstRtpVP8Pay * self, guint8 partid,
gboolean start, gboolean mark, GstBuffer * in)
{
GstBuffer *out;
guint8 *p;
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GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
out = gst_rtp_buffer_new_allocate (gst_rtp_vp8_calc_header_len (self), 0, 0);
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gst_rtp_buffer_map (out, GST_MAP_READWRITE, &rtpbuffer);
p = gst_rtp_buffer_get_payload (&rtpbuffer);
/* X=0,R=0,N=0,S=start,PartID=partid */
p[0] = (start << 4) | partid;
if (self->picture_id_mode != VP8_PAY_NO_PICTURE_ID) {
/* Enable X=1 */
p[0] |= 0x80;
/* X: I=1,L=0,T=0,K=0,RSV=0 */
p[1] = 0x80;
if (self->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS) {
/* I: 7 bit picture_id */
p[2] = self->picture_id & 0x7F;
} else {
/* I: 15 bit picture_id */
p[2] = 0x80 | ((self->picture_id & 0x7FFF) >> 8);
p[3] = self->picture_id & 0xFF;
}
}
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gst_rtp_buffer_set_marker (&rtpbuffer, mark);
gst_rtp_buffer_unmap (&rtpbuffer);
GST_BUFFER_DURATION (out) = GST_BUFFER_DURATION (in);
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GST_BUFFER_PTS (out) = GST_BUFFER_PTS (in);
return out;
}
static guint
gst_rtp_vp8_payload_next (GstRtpVP8Pay * self,
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GstBufferList * list, guint offset, GstBuffer * buffer)
{
guint partition;
GstBuffer *header;
GstBuffer *sub;
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GstBuffer *out;
gboolean mark;
gsize remaining;
gsize available;
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remaining = gst_buffer_get_size (buffer) - offset;
available = gst_rtp_vp8_calc_payload_len (self);
if (available > remaining)
available = remaining;
partition = gst_rtp_vp8_offset_to_partition (self, offset);
g_assert (partition < self->n_partitions);
mark = (remaining == available);
/* whole set of partitions, payload them and done */
header = gst_rtp_vp8_create_header_buffer (self, partition,
offset == self->partition_offset[partition], mark, buffer);
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sub = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, offset, available);
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out = gst_buffer_append (header, sub);
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gst_buffer_list_insert (list, -1, out);
return available;
}
static GstFlowReturn
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gst_rtp_vp8_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
{
GstRtpVP8Pay *self = GST_RTP_VP8_PAY (payload);
GstFlowReturn ret;
GstBufferList *list;
guint offset;
if (G_UNLIKELY (!gst_rtp_vp8_pay_parse_frame (self, buffer))) {
g_message ("Failed to parse frame");
return GST_FLOW_ERROR;
}
list = gst_buffer_list_new ();
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for (offset = 0; offset < gst_buffer_get_size (buffer);)
offset += gst_rtp_vp8_payload_next (self, list, offset, buffer);
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ret = gst_rtp_base_payload_push_list (payload, list);
/* Incremenent and wrap the picture id if it overflows */
if ((self->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS &&
++self->picture_id >= 0x80) ||
(self->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS &&
++self->picture_id >= 0x8000))
self->picture_id = 0;
return ret;
}
static gboolean
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gst_rtp_vp8_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
{
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GstRtpVP8Pay *self = GST_RTP_VP8_PAY (payload);
if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_START) {
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if (self->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS)
self->picture_id = g_random_int_range (0, G_MAXUINT8) & 0x7F;
else if (self->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS)
self->picture_id = g_random_int_range (0, G_MAXUINT16) & 0x7FFF;
}
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return GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_vp8_pay_parent_class)->sink_event
(payload, event);
}
static gboolean
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gst_rtp_vp8_pay_set_caps (GstRTPBasePayload * payload, GstCaps * caps)
{
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gst_rtp_base_payload_set_options (payload, "video", TRUE,
"VP8-DRAFT-IETF-01", 90000);
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return gst_rtp_base_payload_set_outcaps (payload, NULL);
}
gboolean
gst_rtp_vp8_pay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpvp8pay",
GST_RANK_MARGINAL, GST_TYPE_RTP_VP8_PAY);
}