--- /dev/null
+/* GStreamer
+ * Copyright (C) <2008> Wim Taymans <wim.taymans@gmail.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/rtp/gstrtpbuffer.h>
+
+#include <string.h>
+#include "gstrtpjpegdepay.h"
+
+GST_DEBUG_CATEGORY_STATIC (rtpjpegdepay_debug);
+#define GST_CAT_DEFAULT (rtpjpegdepay_debug)
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_jpegdepay_details =
+GST_ELEMENT_DETAILS ("RTP JPEG depayloader",
+ "Codec/Depayloader/Network",
+ "Extracts JPEG video from RTP packets (RFC 2435)",
+ "Wim Taymans <wim.taymans@gmail.com>");
+
+static GstStaticPadTemplate gst_rtp_jpeg_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("image/jpeg")
+ );
+
+static GstStaticPadTemplate gst_rtp_jpeg_depay_sink_template =
+ GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("application/x-rtp, "
+ "media = (string) \"video\", "
+ "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
+ "clock-rate = (int) 90000, " "encoding-name = (string) \"JPEG\";"
+ "application/x-rtp, "
+ "media = (string) \"video\", "
+ "payload = (int) " GST_RTP_PAYLOAD_JPEG_STRING ", "
+ "clock-rate = (int) 90000")
+ );
+
+GST_BOILERPLATE (GstRtpJPEGDepay, gst_rtp_jpeg_depay, GstBaseRTPDepayload,
+ GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static void gst_rtp_jpeg_depay_finalize (GObject * object);
+
+static gboolean gst_rtp_jpeg_depay_setcaps (GstBaseRTPDepayload * depayload,
+ GstCaps * caps);
+static GstBuffer *gst_rtp_jpeg_depay_process (GstBaseRTPDepayload * depayload,
+ GstBuffer * buf);
+
+static GstStateChangeReturn gst_rtp_jpeg_depay_change_state (GstElement *
+ element, GstStateChange transition);
+
+static void
+gst_rtp_jpeg_depay_base_init (gpointer klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&gst_rtp_jpeg_depay_src_template));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&gst_rtp_jpeg_depay_sink_template));
+
+ gst_element_class_set_details (element_class, &gst_rtp_jpegdepay_details);
+}
+
+static void
+gst_rtp_jpeg_depay_class_init (GstRtpJPEGDepayClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstElementClass *gstelement_class;
+ GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
+
+ gobject_class = (GObjectClass *) klass;
+ gstelement_class = (GstElementClass *) klass;
+ gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
+
+ gobject_class->finalize = gst_rtp_jpeg_depay_finalize;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gstelement_class->change_state = gst_rtp_jpeg_depay_change_state;
+
+ gstbasertpdepayload_class->set_caps = gst_rtp_jpeg_depay_setcaps;
+ gstbasertpdepayload_class->process = gst_rtp_jpeg_depay_process;
+
+ GST_DEBUG_CATEGORY_INIT (rtpjpegdepay_debug, "rtpjpegdepay", 0,
+ "JPEG Video RTP Depayloader");
+}
+
+static void
+gst_rtp_jpeg_depay_init (GstRtpJPEGDepay * rtpjpegdepay,
+ GstRtpJPEGDepayClass * klass)
+{
+ rtpjpegdepay->adapter = gst_adapter_new ();
+}
+
+static void
+gst_rtp_jpeg_depay_finalize (GObject * object)
+{
+ GstRtpJPEGDepay *rtpjpegdepay;
+
+ rtpjpegdepay = GST_RTP_JPEG_DEPAY (object);
+
+ g_object_unref (rtpjpegdepay->adapter);
+ rtpjpegdepay->adapter = NULL;
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+/*
+ * Table K.1 from JPEG spec.
+ */
+static const int jpeg_luma_quantizer[64] = {
+ 16, 11, 10, 16, 24, 40, 51, 61,
+ 12, 12, 14, 19, 26, 58, 60, 55,
+ 14, 13, 16, 24, 40, 57, 69, 56,
+ 14, 17, 22, 29, 51, 87, 80, 62,
+ 18, 22, 37, 56, 68, 109, 103, 77,
+ 24, 35, 55, 64, 81, 104, 113, 92,
+ 49, 64, 78, 87, 103, 121, 120, 101,
+ 72, 92, 95, 98, 112, 100, 103, 99
+};
+
+/*
+ * Table K.2 from JPEG spec.
+ */
+static const int jpeg_chroma_quantizer[64] = {
+ 17, 18, 24, 47, 99, 99, 99, 99,
+ 18, 21, 26, 66, 99, 99, 99, 99,
+ 24, 26, 56, 99, 99, 99, 99, 99,
+ 47, 66, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99
+};
+
+/* Call MakeTables with the Q factor and a guint8[128] return array
+ */
+static void
+MakeTables (GstRtpJPEGDepay * rtpjpegdepay, gint Q, guint8 qtable[128])
+{
+ gint i;
+ guint factor;
+
+ factor = CLAMP (Q, 1, 99);
+
+ if (Q < 50)
+ Q = 5000 / factor;
+ else
+ Q = 200 - factor * 2;
+
+ for (i = 0; i < 64; i++) {
+ gint lq = (jpeg_luma_quantizer[i] * Q + 50) / 100;
+ gint cq = (jpeg_chroma_quantizer[i] * Q + 50) / 100;
+
+ /* Limit the quantizers to 1 <= q <= 255 */
+ qtable[i] = CLAMP (lq, 1, 255);
+ qtable[i + 64] = CLAMP (cq, 1, 255);
+ }
+}
+
+static const guint8 lum_dc_codelens[] = {
+ 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0
+};
+
+static const guint8 lum_dc_symbols[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+};
+
+static const guint8 lum_ac_codelens[] = {
+ 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d
+};
+
+static const guint8 lum_ac_symbols[] = {
+ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
+ 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
+ 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
+ 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
+ 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
+ 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
+ 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+ 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
+ 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+ 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+ 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+ 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+ 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
+ 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+ 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
+ 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
+ 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
+ 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
+ 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+
+static const guint8 chm_dc_codelens[] = {
+ 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0
+};
+
+static const guint8 chm_dc_symbols[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+};
+
+static const guint8 chm_ac_codelens[] = {
+ 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77
+};
+
+static const guint8 chm_ac_symbols[] = {
+ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
+ 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+ 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+ 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
+ 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
+ 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
+ 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
+ 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+ 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+ 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+ 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+ 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
+ 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
+ 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
+ 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
+ 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
+ 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
+ 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
+ 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+
+static guint8 *
+MakeQuantHeader (guint8 * p, guint8 * qt, gint size, gint tableNo)
+{
+ *p++ = 0xff;
+ *p++ = 0xdb; /* DQT */
+ *p++ = 0; /* length msb */
+ *p++ = size + 3; /* length lsb */
+ *p++ = tableNo;
+ memcpy (p, qt, size);
+
+ return (p + size);
+}
+
+static guint8 *
+MakeHuffmanHeader (guint8 * p, const guint8 * codelens, int ncodes,
+ const guint8 * symbols, int nsymbols, int tableNo, int tableClass)
+{
+ *p++ = 0xff;
+ *p++ = 0xc4; /* DHT */
+ *p++ = 0; /* length msb */
+ *p++ = 3 + ncodes + nsymbols; /* length lsb */
+ *p++ = (tableClass << 4) | tableNo;
+ memcpy (p, codelens, ncodes);
+ p += ncodes;
+ memcpy (p, symbols, nsymbols);
+ p += nsymbols;
+
+ return (p);
+}
+
+static guint8 *
+MakeDRIHeader (guint8 * p, guint16 dri)
+{
+ *p++ = 0xff;
+ *p++ = 0xdd; /* DRI */
+ *p++ = 0x0; /* length msb */
+ *p++ = 4; /* length lsb */
+ *p++ = dri >> 8; /* dri msb */
+ *p++ = dri & 0xff; /* dri lsb */
+
+ return (p);
+}
+
+/*
+ * Arguments:
+ * type, width, height: as supplied in RTP/JPEG header
+ * qt: quantization tables as either derived from
+ * the Q field using MakeTables() or as specified
+ * in section 4.2.
+ * dri: restart interval in MCUs, or 0 if no restarts.
+ *
+ * p: pointer to return area
+ *
+ * Return value:
+ * The length of the generated headers.
+ *
+ * Generate a frame and scan headers that can be prepended to the
+ * RTP/JPEG data payload to produce a JPEG compressed image in
+ * interchange format (except for possible trailing garbage and
+ * absence of an EOI marker to terminate the scan).
+ */
+static guint
+MakeHeaders (guint8 * p, int type, int width, int height, guint8 * qt,
+ guint precision, guint16 dri)
+{
+ guint8 *start = p;
+ gint size;
+
+ *p++ = 0xff;
+ *p++ = 0xd8; /* SOI */
+
+ size = ((precision & 1) ? 128 : 64);
+ p = MakeQuantHeader (p, qt, size, 0);
+ qt += size;
+
+ size = ((precision & 2) ? 128 : 64);
+ p = MakeQuantHeader (p, qt, size, 1);
+ qt += size;
+
+ if (dri != 0)
+ p = MakeDRIHeader (p, dri);
+
+ *p++ = 0xff;
+ *p++ = 0xc0; /* SOF */
+ *p++ = 0; /* length msb */
+ *p++ = 17; /* length lsb */
+ *p++ = 8; /* 8-bit precision */
+ *p++ = height >> 8; /* height msb */
+ *p++ = height; /* height lsb */
+ *p++ = width >> 8; /* width msb */
+ *p++ = width; /* width lsb */
+ *p++ = 3; /* number of components */
+ *p++ = 0; /* comp 0 */
+ if (type == 0)
+ *p++ = 0x21; /* hsamp = 2, vsamp = 1 */
+ else
+ *p++ = 0x22; /* hsamp = 2, vsamp = 2 */
+ *p++ = 0; /* quant table 0 */
+ *p++ = 1; /* comp 1 */
+ *p++ = 0x11; /* hsamp = 1, vsamp = 1 */
+ *p++ = 1; /* quant table 1 */
+ *p++ = 2; /* comp 2 */
+ *p++ = 0x11; /* hsamp = 1, vsamp = 1 */
+ *p++ = 1; /* quant table 1 */
+
+ p = MakeHuffmanHeader (p, lum_dc_codelens,
+ sizeof (lum_dc_codelens), lum_dc_symbols, sizeof (lum_dc_symbols), 0, 0);
+ p = MakeHuffmanHeader (p, lum_ac_codelens,
+ sizeof (lum_ac_codelens), lum_ac_symbols, sizeof (lum_ac_symbols), 0, 1);
+ p = MakeHuffmanHeader (p, chm_dc_codelens,
+ sizeof (chm_dc_codelens), chm_dc_symbols, sizeof (chm_dc_symbols), 1, 0);
+ p = MakeHuffmanHeader (p, chm_ac_codelens,
+ sizeof (chm_ac_codelens), chm_ac_symbols, sizeof (chm_ac_symbols), 1, 1);
+
+ *p++ = 0xff;
+ *p++ = 0xda; /* SOS */
+ *p++ = 0; /* length msb */
+ *p++ = 12; /* length lsb */
+ *p++ = 3; /* 3 components */
+ *p++ = 0; /* comp 0 */
+ *p++ = 0; /* huffman table 0 */
+ *p++ = 1; /* comp 1 */
+ *p++ = 0x11; /* huffman table 1 */
+ *p++ = 2; /* comp 2 */
+ *p++ = 0x11; /* huffman table 1 */
+ *p++ = 0; /* first DCT coeff */
+ *p++ = 63; /* last DCT coeff */
+ *p++ = 0; /* sucessive approx. */
+
+ return (p - start);
+};
+
+static gboolean
+gst_rtp_jpeg_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
+{
+ GstStructure *structure;
+ GstRtpJPEGDepay *rtpjpegdepay;
+ GstCaps *outcaps;
+ gint clock_rate;
+ gboolean res;
+
+ rtpjpegdepay = GST_RTP_JPEG_DEPAY (depayload);
+
+ structure = gst_caps_get_structure (caps, 0);
+
+ if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
+ clock_rate = 90000;
+ depayload->clock_rate = clock_rate;
+
+ outcaps =
+ gst_caps_new_simple ("image/jpeg", "framerate", GST_TYPE_FRACTION, 0, 1,
+ NULL);
+ res = gst_pad_set_caps (depayload->srcpad, outcaps);
+ gst_caps_unref (outcaps);
+
+ return res;
+}
+
+static GstBuffer *
+gst_rtp_jpeg_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+ GstRtpJPEGDepay *rtpjpegdepay;
+ GstBuffer *outbuf;
+ gint payload_len, header_len;
+ guint8 *payload;
+ guint frag_offset;
+ gint Q;
+ guint type, width, height;
+ guint16 dri, precision, length;
+ guint8 *qtable;
+
+ rtpjpegdepay = GST_RTP_JPEG_DEPAY (depayload);
+
+ if (GST_BUFFER_IS_DISCONT (buf)) {
+ gst_adapter_clear (rtpjpegdepay->adapter);
+ }
+
+ payload_len = gst_rtp_buffer_get_payload_len (buf);
+
+ if (payload_len < 8)
+ goto empty_packet;
+
+ payload = gst_rtp_buffer_get_payload (buf);
+ header_len = 0;
+
+ /* 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Type-specific | Fragment Offset |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Type | Q | Width | Height |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ frag_offset = (payload[1] << 16) | (payload[2] << 8) | payload[3];
+ type = payload[4];
+ Q = payload[5];
+ width = payload[6] * 8;
+ height = payload[7] * 8;
+
+ GST_DEBUG_OBJECT (rtpjpegdepay, "frag %u, type %u, Q %d, width %u, height %u",
+ frag_offset, type, Q, width, height);
+
+ header_len += 8;
+ payload += 8;
+ payload_len -= 8;
+
+ dri = 0;
+ if (type > 63) {
+ if (payload_len < 4)
+ goto empty_packet;
+
+ /* 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Restart Interval |F|L| Restart Count |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ dri = (payload[0] << 8) | payload[1];
+
+ GST_DEBUG_OBJECT (rtpjpegdepay, "DRI %" G_GUINT16_FORMAT, dri);
+
+ payload += 4;
+ header_len += 4;
+ payload_len -= 4;
+ }
+
+ if (Q >= 128 && frag_offset == 0) {
+ if (payload_len < 4)
+ goto empty_packet;
+
+ /* 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | MBZ | Precision | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Quantization Table Data |
+ * | ... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ precision = payload[1];
+ length = (payload[2] << 8) | payload[3];
+
+ GST_DEBUG_OBJECT (rtpjpegdepay, "precision %04x, length %" G_GUINT16_FORMAT,
+ precision, length);
+
+ if (Q == 255 && length == 0)
+ goto empty_packet;
+
+ payload += 4;
+ header_len += 4;
+ payload_len -= 4;
+
+ if (length > payload_len)
+ goto empty_packet;
+
+ qtable = payload;
+
+ payload += length;
+ header_len += length;
+ payload_len -= length;
+ } else {
+ length = 0;
+ qtable = NULL;
+ precision = 0;
+ }
+
+ if (frag_offset == 0) {
+ guint size;
+
+ /* first packet */
+ if (length == 0) {
+ if (Q < 128) {
+ /* no quant table, see if we have one cached */
+ qtable = rtpjpegdepay->qtables[Q];
+ if (!qtable) {
+ GST_DEBUG_OBJECT (rtpjpegdepay, "making Q %d table", Q);
+ /* make and cache the table */
+ qtable = g_new (guint8, 128);
+ MakeTables (rtpjpegdepay, Q, qtable);
+ rtpjpegdepay->qtables[Q] = qtable;
+ } else {
+ GST_DEBUG_OBJECT (rtpjpegdepay, "using cached table for Q %d", Q);
+ }
+ /* all 8 bit quantizers */
+ precision = 0;
+ }
+ }
+ /* max header length, should be big enough */
+ outbuf = gst_buffer_new_and_alloc (1000);
+ size = MakeHeaders (GST_BUFFER_DATA (outbuf), type,
+ width, height, qtable, precision, dri);
+
+ GST_DEBUG_OBJECT (rtpjpegdepay, "pushing %u bytes header", size);
+
+ GST_BUFFER_SIZE (outbuf) = size;
+
+ gst_adapter_push (rtpjpegdepay->adapter, outbuf);
+
+ }
+
+ /* take JPEG data, push in the adapter */
+ GST_DEBUG_OBJECT (rtpjpegdepay, "pushing data at offset %d", header_len);
+ outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, header_len, -1);
+ gst_adapter_push (rtpjpegdepay->adapter, outbuf);
+ outbuf = NULL;
+
+ if (gst_rtp_buffer_get_marker (buf)) {
+ guint avail;
+
+ /* last buffer take all data out of the adapter */
+ avail = gst_adapter_available (rtpjpegdepay->adapter);
+ outbuf = gst_adapter_take_buffer (rtpjpegdepay->adapter, avail);
+
+ GST_DEBUG_OBJECT (rtpjpegdepay, "last buffer, returning %u bytes", avail);
+ }
+
+ return outbuf;
+
+ /* ERRORS */
+empty_packet:
+ {
+ GST_ELEMENT_WARNING (rtpjpegdepay, STREAM, DECODE,
+ ("Empty Payload."), (NULL));
+ return NULL;
+ }
+}
+
+static GstStateChangeReturn
+gst_rtp_jpeg_depay_change_state (GstElement * element,
+ GstStateChange transition)
+{
+ GstRtpJPEGDepay *rtpjpegdepay;
+ GstStateChangeReturn ret;
+
+ rtpjpegdepay = GST_RTP_JPEG_DEPAY (element);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_NULL_TO_READY:
+ break;
+ default:
+ break;
+ }
+
+ ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_NULL:
+ break;
+ default:
+ break;
+ }
+ return ret;
+}
+
+gboolean
+gst_rtp_jpeg_depay_plugin_init (GstPlugin * plugin)
+{
+ return gst_element_register (plugin, "rtpjpegdepay",
+ GST_RANK_MARGINAL, GST_TYPE_RTP_JPEG_DEPAY);
+}
projects / platform / upstream / gst-plugins-good.git / commitdiff