2 * gstrtpvp8pay.c - Source for GstRtpVP8Pay
3 * Copyright (C) 2011 Sjoerd Simons <sjoerd@luon.net>
4 * Copyright (C) 2011 Collabora Ltd.
5 * Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <gst/base/gstbitreader.h>
31 #include <gst/rtp/gstrtppayloads.h>
32 #include <gst/rtp/gstrtpbuffer.h>
33 #include "dboolhuff.h"
34 #include "gstrtpvp8pay.h"
36 GST_DEBUG_CATEGORY_STATIC (gst_rtp_vp8_pay_debug);
37 #define GST_CAT_DEFAULT gst_rtp_vp8_pay_debug
39 #define DEFAULT_PICTURE_ID_MODE VP8_PAY_NO_PICTURE_ID
47 #define GST_TYPE_RTP_VP8_PAY_PICTURE_ID_MODE (gst_rtp_vp8_pay_picture_id_mode_get_type())
49 gst_rtp_vp8_pay_picture_id_mode_get_type (void)
51 static GType mode_type = 0;
52 static const GEnumValue modes[] = {
53 {VP8_PAY_NO_PICTURE_ID, "No Picture ID", "none"},
54 {VP8_PAY_PICTURE_ID_7BITS, "7-bit Picture ID", "7-bit"},
55 {VP8_PAY_PICTURE_ID_15BITS, "15-bit Picture ID", "15-bit"},
60 mode_type = g_enum_register_static ("GstVP8RTPPayMode", modes);
65 static void gst_rtp_vp8_pay_get_property (GObject * object, guint prop_id,
66 GValue * value, GParamSpec * pspec);
67 static void gst_rtp_vp8_pay_set_property (GObject * object, guint prop_id,
68 const GValue * value, GParamSpec * pspec);
70 static GstFlowReturn gst_rtp_vp8_pay_handle_buffer (GstRTPBasePayload * payload,
72 static gboolean gst_rtp_vp8_pay_sink_event (GstRTPBasePayload * payload,
74 static gboolean gst_rtp_vp8_pay_set_caps (GstRTPBasePayload * payload,
77 G_DEFINE_TYPE (GstRtpVP8Pay, gst_rtp_vp8_pay, GST_TYPE_RTP_BASE_PAYLOAD);
79 static GstStaticPadTemplate gst_rtp_vp8_pay_src_template =
80 GST_STATIC_PAD_TEMPLATE ("src",
83 GST_STATIC_CAPS ("application/x-rtp, "
84 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ","
85 "clock-rate = (int) 90000, encoding-name = (string) \"VP8-DRAFT-IETF-01\""));
87 static GstStaticPadTemplate gst_rtp_vp8_pay_sink_template =
88 GST_STATIC_PAD_TEMPLATE ("sink",
91 GST_STATIC_CAPS ("video/x-vp8"));
94 gst_rtp_vp8_pay_init (GstRtpVP8Pay * obj)
96 obj->picture_id_mode = DEFAULT_PICTURE_ID_MODE;
97 if (obj->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS)
98 obj->picture_id = g_random_int_range (0, G_MAXUINT8) & 0x7F;
99 else if (obj->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS)
100 obj->picture_id = g_random_int_range (0, G_MAXUINT16) & 0x7FFF;
104 gst_rtp_vp8_pay_class_init (GstRtpVP8PayClass * gst_rtp_vp8_pay_class)
106 GObjectClass *gobject_class = G_OBJECT_CLASS (gst_rtp_vp8_pay_class);
107 GstElementClass *element_class = GST_ELEMENT_CLASS (gst_rtp_vp8_pay_class);
108 GstRTPBasePayloadClass *pay_class =
109 GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_vp8_pay_class);
111 gobject_class->set_property = gst_rtp_vp8_pay_set_property;
112 gobject_class->get_property = gst_rtp_vp8_pay_get_property;
114 g_object_class_install_property (gobject_class, PROP_PICTURE_ID_MODE,
115 g_param_spec_enum ("picture-id-mode", "Picture ID Mode",
116 "The picture ID mode for payloading",
117 GST_TYPE_RTP_VP8_PAY_PICTURE_ID_MODE, DEFAULT_PICTURE_ID_MODE,
118 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
120 gst_element_class_add_pad_template (element_class,
121 gst_static_pad_template_get (&gst_rtp_vp8_pay_sink_template));
122 gst_element_class_add_pad_template (element_class,
123 gst_static_pad_template_get (&gst_rtp_vp8_pay_src_template));
125 gst_element_class_set_static_metadata (element_class, "RTP VP8 payloader",
126 "Codec/Payloader/Network/RTP",
127 "Puts VP8 video in RTP packets)", "Sjoerd Simons <sjoerd@luon.net>");
129 pay_class->handle_buffer = gst_rtp_vp8_pay_handle_buffer;
130 pay_class->sink_event = gst_rtp_vp8_pay_sink_event;
131 pay_class->set_caps = gst_rtp_vp8_pay_set_caps;
133 GST_DEBUG_CATEGORY_INIT (gst_rtp_vp8_pay_debug, "rtpvp8pay", 0,
134 "VP8 Video RTP Payloader");
138 gst_rtp_vp8_pay_set_property (GObject * object,
139 guint prop_id, const GValue * value, GParamSpec * pspec)
141 GstRtpVP8Pay *rtpvp8pay = GST_RTP_VP8_PAY (object);
144 case PROP_PICTURE_ID_MODE:
145 rtpvp8pay->picture_id_mode = g_value_get_enum (value);
146 if (rtpvp8pay->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS)
147 rtpvp8pay->picture_id = g_random_int_range (0, G_MAXUINT8) & 0x7F;
148 else if (rtpvp8pay->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS)
149 rtpvp8pay->picture_id = g_random_int_range (0, G_MAXUINT16) & 0x7FFF;
152 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
158 gst_rtp_vp8_pay_get_property (GObject * object,
159 guint prop_id, GValue * value, GParamSpec * pspec)
161 GstRtpVP8Pay *rtpvp8pay = GST_RTP_VP8_PAY (object);
164 case PROP_PICTURE_ID_MODE:
165 g_value_set_enum (value, rtpvp8pay->picture_id_mode);
168 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
174 gst_rtp_vp8_pay_parse_frame (GstRtpVP8Pay * self, GstBuffer * buffer)
176 GstBitReader *reader = NULL;
182 guint32 partition0_size;
190 if (G_UNLIKELY (gst_buffer_get_size (buffer) < 3))
193 if (!gst_buffer_map (buffer, &map, GST_MAP_READ) || !map.data)
198 reader = gst_bit_reader_new (data, size);
200 self->is_keyframe = keyframe = ((data[0] & 0x1) == 0);
201 version = (data[0] >> 1) & 0x7;
203 if (G_UNLIKELY (version > 3)) {
204 GST_ERROR_OBJECT (self, "Unknown VP8 version %u", version);
208 /* keyframe, version and show_frame use 5 bits */
209 partition0_size = data[2] << 11 | data[1] << 3 | (data[0] >> 5);
211 /* Include the uncompressed data blob in the first partition */
212 offset = keyframe ? 10 : 3;
213 partition0_size += offset;
215 if (!gst_bit_reader_skip (reader, 24))
219 /* check start tag: 0x9d 0x01 0x2a */
220 if (!gst_bit_reader_get_bits_uint8 (reader, &tmp8, 8) || tmp8 != 0x9d)
223 if (!gst_bit_reader_get_bits_uint8 (reader, &tmp8, 8) || tmp8 != 0x01)
226 if (!gst_bit_reader_get_bits_uint8 (reader, &tmp8, 8) || tmp8 != 0x2a)
229 /* Skip horizontal size code (16 bits) vertical size code (16 bits) */
230 if (!gst_bit_reader_skip (reader, 32))
234 offset = keyframe ? 10 : 3;
235 vp8dx_start_decode (&bc, data + offset, size - offset);
238 /* color space (1 bit) and clamping type (1 bit) */
239 vp8dx_decode_bool (&bc, 0x80);
240 vp8dx_decode_bool (&bc, 0x80);
243 /* segmentation_enabled */
244 if (vp8dx_decode_bool (&bc, 0x80)) {
245 guint8 update_mb_segmentation_map = vp8dx_decode_bool (&bc, 0x80);
246 guint8 update_segment_feature_data = vp8dx_decode_bool (&bc, 0x80);
248 if (update_segment_feature_data) {
249 /* skip segment feature mode */
250 vp8dx_decode_bool (&bc, 0x80);
252 /* quantizer update */
253 for (i = 0; i < 4; i++) {
254 /* skip flagged quantizer value (7 bits) and sign (1 bit) */
255 if (vp8dx_decode_bool (&bc, 0x80))
256 vp8_decode_value (&bc, 8);
259 /* loop filter update */
260 for (i = 0; i < 4; i++) {
261 /* skip flagged lf update value (6 bits) and sign (1 bit) */
262 if (vp8dx_decode_bool (&bc, 0x80))
263 vp8_decode_value (&bc, 7);
267 if (update_mb_segmentation_map) {
268 /* segment prob update */
269 for (i = 0; i < 3; i++) {
270 /* skip flagged segment prob */
271 if (vp8dx_decode_bool (&bc, 0x80))
272 vp8_decode_value (&bc, 8);
277 /* skip filter type (1 bit), loop filter level (6 bits) and
278 * sharpness level (3 bits) */
279 vp8_decode_value (&bc, 1);
280 vp8_decode_value (&bc, 6);
281 vp8_decode_value (&bc, 3);
283 /* loop_filter_adj_enabled */
284 if (vp8dx_decode_bool (&bc, 0x80)) {
287 if (vp8dx_decode_bool (&bc, 0x80)) {
289 for (i = 0; i < 8; i++) {
290 /* 8 updates, 1 bit indicate whether there is one and if follow by a
292 if (vp8dx_decode_bool (&bc, 0x80))
293 vp8_decode_value (&bc, 7);
298 if (vp8dx_bool_error (&bc))
301 tmp8 = vp8_decode_value (&bc, 2);
303 partitions = 1 << tmp8;
305 /* Check if things are still sensible */
306 if (partition0_size + (partitions - 1) * 3 >= size)
309 /* partition data is right after the mode partition */
310 pdata = data + partition0_size;
313 self->n_partitions = partitions + 1;
314 self->partition_offset[0] = 0;
315 self->partition_size[0] = partition0_size + (partitions - 1) * 3;
317 self->partition_offset[1] = self->partition_size[0];
318 for (i = 1; i < partitions; i++) {
319 guint psize = (pdata[2] << 16 | pdata[1] << 8 | pdata[0]);
322 self->partition_size[i] = psize;
323 self->partition_offset[i + 1] = self->partition_offset[i] + psize;
326 /* Check that our partition offsets and sizes don't go outsize the buffer
328 if (self->partition_offset[i] >= size)
331 self->partition_size[i] = size - self->partition_offset[i];
333 self->partition_offset[i + 1] = size;
335 gst_bit_reader_free (reader);
336 gst_buffer_unmap (buffer, &map);
340 GST_DEBUG ("Failed to parse frame");
342 gst_bit_reader_free (reader);
343 gst_buffer_unmap (buffer, &map);
349 gst_rtp_vp8_offset_to_partition (GstRtpVP8Pay * self, guint offset)
353 for (i = 0; i < self->n_partitions; i++) {
354 if (offset >= self->partition_offset[i] &&
355 offset < self->partition_offset[i + 1])
363 gst_rtp_vp8_calc_header_len (GstRtpVP8Pay * self)
365 switch (self->picture_id_mode) {
366 case VP8_PAY_PICTURE_ID_7BITS:
368 case VP8_PAY_PICTURE_ID_15BITS:
370 case VP8_PAY_NO_PICTURE_ID:
377 gst_rtp_vp8_calc_payload_len (GstRtpVP8Pay * self)
379 GstRTPBasePayload *payload = GST_RTP_BASE_PAYLOAD (self);
381 return gst_rtp_buffer_calc_payload_len (GST_RTP_BASE_PAYLOAD_MTU (payload) -
382 gst_rtp_vp8_calc_header_len (self), 0, 0);
385 /* When growing the vp8 header keep gst_rtp_vp8_calc_payload_len in sync */
387 gst_rtp_vp8_create_header_buffer (GstRtpVP8Pay * self, guint8 partid,
388 gboolean start, gboolean mark, GstBuffer * in)
392 GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
394 out = gst_rtp_buffer_new_allocate (gst_rtp_vp8_calc_header_len (self), 0, 0);
395 gst_rtp_buffer_map (out, GST_MAP_READWRITE, &rtpbuffer);
396 p = gst_rtp_buffer_get_payload (&rtpbuffer);
397 /* X=0,R=0,N=0,S=start,PartID=partid */
398 p[0] = (start << 4) | partid;
399 if (self->picture_id_mode != VP8_PAY_NO_PICTURE_ID) {
402 /* X: I=1,L=0,T=0,K=0,RSV=0 */
404 if (self->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS) {
405 /* I: 7 bit picture_id */
406 p[2] = self->picture_id & 0x7F;
408 /* I: 15 bit picture_id */
409 p[2] = 0x80 | ((self->picture_id & 0x7FFF) >> 8);
410 p[3] = self->picture_id & 0xFF;
414 gst_rtp_buffer_set_marker (&rtpbuffer, mark);
416 gst_rtp_buffer_unmap (&rtpbuffer);
418 GST_BUFFER_DURATION (out) = GST_BUFFER_DURATION (in);
419 GST_BUFFER_PTS (out) = GST_BUFFER_PTS (in);
426 gst_rtp_vp8_payload_next (GstRtpVP8Pay * self,
427 GstBufferList * list, guint offset, GstBuffer * buffer)
437 remaining = gst_buffer_get_size (buffer) - offset;
438 available = gst_rtp_vp8_calc_payload_len (self);
439 if (available > remaining)
440 available = remaining;
442 partition = gst_rtp_vp8_offset_to_partition (self, offset);
443 g_assert (partition < self->n_partitions);
445 mark = (remaining == available);
446 /* whole set of partitions, payload them and done */
447 header = gst_rtp_vp8_create_header_buffer (self, partition,
448 offset == self->partition_offset[partition], mark, buffer);
449 sub = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, offset, available);
451 out = gst_buffer_append (header, sub);
453 gst_buffer_list_insert (list, -1, out);
460 gst_rtp_vp8_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
462 GstRtpVP8Pay *self = GST_RTP_VP8_PAY (payload);
467 if (G_UNLIKELY (!gst_rtp_vp8_pay_parse_frame (self, buffer))) {
468 g_message ("Failed to parse frame");
469 return GST_FLOW_ERROR;
472 list = gst_buffer_list_new ();
474 for (offset = 0; offset < gst_buffer_get_size (buffer);)
475 offset += gst_rtp_vp8_payload_next (self, list, offset, buffer);
477 ret = gst_rtp_base_payload_push_list (payload, list);
479 /* Incremenent and wrap the picture id if it overflows */
480 if ((self->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS &&
481 ++self->picture_id >= 0x80) ||
482 (self->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS &&
483 ++self->picture_id >= 0x8000))
484 self->picture_id = 0;
490 gst_rtp_vp8_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
492 GstRtpVP8Pay *self = GST_RTP_VP8_PAY (payload);
494 if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_START) {
495 if (self->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS)
496 self->picture_id = g_random_int_range (0, G_MAXUINT8) & 0x7F;
497 else if (self->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS)
498 self->picture_id = g_random_int_range (0, G_MAXUINT16) & 0x7FFF;
501 return GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_vp8_pay_parent_class)->sink_event
506 gst_rtp_vp8_pay_set_caps (GstRTPBasePayload * payload, GstCaps * caps)
508 gst_rtp_base_payload_set_options (payload, "video", TRUE,
509 "VP8-DRAFT-IETF-01", 90000);
510 return gst_rtp_base_payload_set_outcaps (payload, NULL);
514 gst_rtp_vp8_pay_plugin_init (GstPlugin * plugin)
516 return gst_element_register (plugin, "rtpvp8pay",
517 GST_RANK_MARGINAL, GST_TYPE_RTP_VP8_PAY);