--- /dev/null
+/*
+ * RTP H264 Protocol (RFC3984)
+ * Copyright (c) 2006 Ryan Martell.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+* @file rtp_h264.c
+ * @brief H.264 / RTP Code (RFC3984)
+ * @author Ryan Martell <rdm4@martellventures.com>
+ *
+ * @note Notes:
+ * Notes:
+ * This currently supports packetization mode:
+ * Single Nal Unit Mode (0), or
+ * Non-Interleaved Mode (1). It currently does not support
+ * Interleaved Mode (2). (This requires implementing STAP-B, MTAP16, MTAP24, FU-B packet types)
+ *
+ * @note TODO:
+ * 1) RTCP sender reports for udp streams are required..
+ *
+ */
+
+#include "avformat.h"
+#include "mpegts.h"
+#include "bitstream.h"
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <assert.h>
+#ifndef __BEOS__
+# include <arpa/inet.h>
+#else
+# include "barpainet.h"
+#endif
+#include <netdb.h>
+
+#include "rtp_internal.h"
+#include "rtp_h264.h"
+#include "base64.h"
+
+/**
+ RTP/H264 specific private data.
+*/
+typedef struct h264_rtp_extra_data {
+ unsigned long cookie; ///< sanity check, to make sure we get the pointer we're expecting.
+
+ //sdp setup parameters
+ uint8_t profile_idc; ///< from the sdp setup parameters.
+ uint8_t profile_iop; ///< from the sdp setup parameters.
+ uint8_t level_idc; ///< from the sdp setup parameters.
+ int packetization_mode; ///< from the sdp setup parameters.
+#ifdef DEBUG
+ int packet_types_received[32];
+#endif
+} h264_rtp_extra_data;
+
+#define MAGIC_COOKIE (0xdeadbeef) ///< Cookie for the extradata; to verify we are what we think we are, and that we haven't been freed.
+#define DEAD_COOKIE (0xdeaddead) ///< Cookie for the extradata; once it is freed.
+
+/* ---------------- private code */
+static void sdp_parse_fmtp_config_h264(AVStream * stream,
+ h264_rtp_extra_data * h264_data,
+ char *attr, char *value)
+{
+ AVCodecContext *codec = stream->codec;
+ assert(codec->codec_id == CODEC_ID_H264);
+ assert(h264_data != NULL);
+
+ if (!strcmp(attr, "packetization-mode")) {
+ av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Packetization Mode: %d\n", atoi(attr));
+ h264_data->packetization_mode = atoi(attr);
+ /*
+ Packetization Mode:
+ 0 or not present: Single NAL mode (Only nals from 1-23 are allowed)
+ 1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed.
+ 2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), and 29 (FU-B) are allowed.
+ */
+ if (h264_data->packetization_mode > 1)
+ av_log(stream, AV_LOG_ERROR,
+ "H.264/RTP Interleaved RTP mode is not supported yet.");
+ } else if (!strcmp(attr, "profile-level-id")) {
+ if (strlen(value) == 6) {
+ char buffer[3];
+ // 6 characters=3 bytes, in hex.
+ uint8_t profile_idc;
+ uint8_t profile_iop;
+ uint8_t level_idc;
+
+ buffer[0] = value[0]; buffer[1] = value[1]; buffer[2] = '\0';
+ profile_idc = strtol(buffer, NULL, 16);
+ buffer[0] = value[2]; buffer[1] = value[3];
+ profile_iop = strtol(buffer, NULL, 16);
+ buffer[0] = value[4]; buffer[1] = value[5];
+ level_idc = strtol(buffer, NULL, 16);
+
+ // set the parameters...
+ av_log(NULL, AV_LOG_DEBUG,
+ "H.264/RTP Profile IDC: %x Profile IOP: %x Level: %x\n",
+ profile_idc, profile_iop, level_idc);
+ h264_data->profile_idc = profile_idc;
+ h264_data->profile_iop = profile_iop;
+ h264_data->level_idc = level_idc;
+ }
+ } else if (!strcmp(attr, "sprop-parameter-sets")) {
+ uint8_t start_sequence[]= { 0, 0, 1 };
+ codec->extradata_size= 0;
+ codec->extradata= NULL;
+
+ while (*value) {
+ char base64packet[1024];
+ uint8_t decoded_packet[1024];
+ uint32_t packet_size;
+ char *dst = base64packet;
+
+ while (*value && *value != ','
+ && (dst - base64packet) < sizeof(base64packet) - 1) {
+ *dst++ = *value++;
+ }
+ *dst++ = '\0';
+
+ if (*value == ',')
+ value++;
+
+ packet_size= av_base64_decode(decoded_packet, base64packet, sizeof(decoded_packet));
+ if (packet_size) {
+ uint8_t *dest= av_malloc(packet_size+sizeof(start_sequence)+codec->extradata_size);
+ if(dest)
+ {
+ if(codec->extradata_size)
+ {
+ // av_realloc?
+ memcpy(dest, codec->extradata, codec->extradata_size);
+ av_free(codec->extradata);
+ }
+
+ memcpy(dest+codec->extradata_size, start_sequence, sizeof(start_sequence));
+ memcpy(dest+codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size);
+
+ codec->extradata= dest;
+ codec->extradata_size+= sizeof(start_sequence)+packet_size;
+ } else {
+ av_log(NULL, AV_LOG_ERROR, "H.264/RTP Unable to allocate memory for extradata!");
+ }
+ }
+ }
+ av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Extradata set to %p (size: %d)!", codec->extradata, codec->extradata_size);
+ }
+}
+
+// return 0 on packet, no more left, 1 on packet, 1 on partial packet...
+static int h264_handle_packet(RTPDemuxContext * s,
+ AVPacket * pkt,
+ uint32_t * timestamp,
+ const uint8_t * buf,
+ int len)
+{
+// h264_rtp_extra_data *data = s->dynamic_protocol_context;
+ uint8_t nal = buf[0];
+ uint8_t type = (nal & 0x1f);
+ int result= 0;
+ uint8_t start_sequence[]= {0, 0, 1};
+
+ assert(data);
+ assert(data->cookie == MAGIC_COOKIE);
+ assert(buf);
+
+ if (type >= 1 && type <= 23)
+ type = 1; // simplify the case. (these are all the nal types used internally by the h264 codec)
+ switch (type) {
+ case 0: // undefined;
+ result= -1;
+ break;
+
+ case 1:
+ av_new_packet(pkt, len+sizeof(start_sequence));
+ memcpy(pkt->data, start_sequence, sizeof(start_sequence));
+ memcpy(pkt->data+sizeof(start_sequence), buf, len);
+#ifdef DEBUG
+ data->packet_types_received[nal & 0x1f]++;
+#endif
+ break;
+
+ case 24: // STAP-A (one packet, multiple nals)
+ // consume the STAP-A NAL
+ buf++;
+ len--;
+ // first we are going to figure out the total size....
+ {
+ int pass= 0;
+ int total_length= 0;
+ uint8_t *dst= NULL;
+
+ for(pass= 0; pass<2; pass++) {
+ const uint8_t *src= buf;
+ int src_len= len;
+
+ do {
+ uint16_t nal_size = BE_16(src); // this going to be a problem if unaligned (can it be?)
+
+ // consume the length of the aggregate...
+ src += 2;
+ src_len -= 2;
+
+ if (nal_size <= src_len) {
+ if(pass==0) {
+ // counting...
+ total_length+= sizeof(start_sequence)+nal_size;
+ } else {
+ // copying
+ assert(dst);
+ memcpy(dst, start_sequence, sizeof(start_sequence));
+ dst+= sizeof(start_sequence);
+ memcpy(dst, src, nal_size);
+#ifdef DEBUG
+ data->packet_types_received[*src & 0x1f]++;
+#endif
+ dst+= nal_size;
+ }
+ } else {
+ av_log(NULL, AV_LOG_ERROR,
+ "nal size exceeds length: %d %d\n", nal_size, src_len);
+ }
+
+ // eat what we handled...
+ src += nal_size;
+ src_len -= nal_size;
+
+ if (src_len < 0)
+ av_log(NULL, AV_LOG_ERROR,
+ "Consumed more bytes than we got! (%d)\n", src_len);
+ } while (src_len > 2); // because there could be rtp padding..
+
+ if(pass==0) {
+ // now we know the total size of the packet (with the start sequences added)
+ av_new_packet(pkt, total_length);
+ dst= pkt->data;
+ } else {
+ assert(dst-pkt->data==total_length);
+ }
+ }
+ }
+ break;
+
+ case 25: // STAP-B
+ case 26: // MTAP-16
+ case 27: // MTAP-24
+ case 29: // FU-B
+ av_log(NULL, AV_LOG_ERROR,
+ "Unhandled type (%d) (See RFC for implementation details\n",
+ type);
+ result= -1;
+ break;
+
+ case 28: // FU-A (fragmented nal)
+ buf++;
+ len--; // skip the fu_indicator
+ {
+ // these are the same as above, we just redo them here for clarity...
+ uint8_t fu_indicator = nal;
+ uint8_t fu_header = *buf; // read the fu_header.
+ uint8_t start_bit = (fu_header & 0x80) >> 7;
+// uint8_t end_bit = (fu_header & 0x40) >> 6;
+ uint8_t nal_type = (fu_header & 0x1f);
+ uint8_t reconstructed_nal;
+
+ // reconstruct this packet's true nal; only the data follows..
+ reconstructed_nal = fu_indicator & (0xe0); // the original nal forbidden bit and NRI are stored in this packet's nal;
+ reconstructed_nal |= (nal_type & 0x1f);
+
+ // skip the fu_header...
+ buf++;
+ len--;
+
+#ifdef DEBUG
+ if (start_bit)
+ data->packet_types_received[nal_type & 0x1f]++;
+#endif
+ if(start_bit) {
+ // copy in the start sequence, and the reconstructed nal....
+ av_new_packet(pkt, sizeof(start_sequence)+sizeof(nal)+len);
+ memcpy(pkt->data, start_sequence, sizeof(start_sequence));
+ pkt->data[sizeof(start_sequence)]= reconstructed_nal;
+ memcpy(pkt->data+sizeof(start_sequence)+sizeof(nal), buf, len);
+ } else {
+ av_new_packet(pkt, len);
+ memcpy(pkt->data, buf, len);
+ }
+ }
+ break;
+
+ case 30: // undefined
+ case 31: // undefined
+ default:
+ av_log(NULL, AV_LOG_ERROR, "Undefined type (%d)", type);
+ result= -1;
+ break;
+ }
+
+ return result;
+}
+
+/* ---------------- public code */
+static void *h264_new_extradata()
+{
+ h264_rtp_extra_data *data =
+ av_mallocz(sizeof(h264_rtp_extra_data) +
+ FF_INPUT_BUFFER_PADDING_SIZE);
+
+ if (data) {
+ data->cookie = MAGIC_COOKIE;
+ }
+
+ return data;
+}
+
+static void h264_free_extradata(void *d)
+{
+ h264_rtp_extra_data *data = (h264_rtp_extra_data *) d;
+#ifdef DEBUG
+ int ii;
+
+ for (ii = 0; ii < 32; ii++) {
+ if (data->packet_types_received[ii])
+ av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n",
+ data->packet_types_received[ii], ii);
+ }
+#endif
+
+ assert(data);
+ assert(data->cookie == MAGIC_COOKIE);
+
+ // avoid stale pointers (assert)
+ data->cookie = DEAD_COOKIE;
+
+ // and clear out this...
+ av_free(data);
+}
+
+static int parse_h264_sdp_line(AVStream * stream, void *data,
+ const char *line)
+{
+ AVCodecContext *codec = stream->codec;
+ h264_rtp_extra_data *h264_data = (h264_rtp_extra_data *) data;
+ const char *p = line;
+
+ assert(h264_data->cookie == MAGIC_COOKIE);
+
+ if (strstart(p, "framesize:", &p)) {
+ char buf1[50];
+ char *dst = buf1;
+
+ // remove the protocol identifier..
+ while (*p && *p == ' ') p++; // strip spaces.
+ while (*p && *p != ' ') p++; // eat protocol identifier
+ while (*p && *p == ' ') p++; // strip trailing spaces.
+ while (*p && *p != '-' && (buf1 - dst) < sizeof(buf1) - 1) {
+ *dst++ = *p++;
+ }
+ *dst = '\0';
+
+ // a='framesize:96 320-240'
+ // set our parameters..
+ codec->width = atoi(buf1);
+ codec->height = atoi(p + 1); // skip the -
+ codec->pix_fmt = PIX_FMT_YUV420P;
+ } else if (strstart(p, "fmtp:", &p)) {
+ char attr[256];
+ char value[4096];
+
+ // remove the protocol identifier..
+ while (*p && *p == ' ') p++; // strip spaces.
+ while (*p && *p != ' ') p++; // eat protocol identifier
+ while (*p && *p == ' ') p++; // strip trailing spaces.
+
+ /* loop on each attribute */
+ while (rtsp_next_attr_and_value
+ (&p, attr, sizeof(attr), value, sizeof(value))) {
+ /* grab the codec extra_data from the config parameter of the fmtp line */
+ sdp_parse_fmtp_config_h264(stream, h264_data, attr, value);
+ }
+ } else if (strstart(p, "cliprect:", &p)) {
+ // could use this if we wanted.
+ }
+
+ av_set_pts_info(stream, 33, 1, 90000); // 33 should be right, because the pts is 64 bit? (done elsewhere; this is a one time thing)
+
+ return 0; // keep processing it the normal way...
+}
+
+/**
+This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
+*/
+RTPDynamicProtocolHandler ff_h264_dynamic_handler = {
+ "H264",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_H264,
+ parse_h264_sdp_line,
+ h264_new_extradata,
+ h264_free_extradata,
+ h264_handle_packet
+};