/* * 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 libavformat/rtp_h264.c * @brief H.264 / RTP Code (RFC3984) * @author Ryan Martell * * @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 "libavutil/base64.h" #include "libavutil/avstring.h" #include "libavcodec/bitstream.h" #include "avformat.h" #include "mpegts.h" #include #include "network.h" #include #include "rtpdec.h" #include "rtp_h264.h" /** RTP/H264 specific private data. */ struct PayloadContext { 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 }; #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, PayloadContext * 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(value)); h264_data->packetization_mode = atoi(value); /* 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(AVFormatContext *ctx, PayloadContext *data, AVStream *st, AVPacket * pkt, uint32_t * timestamp, const uint8_t * buf, int len, int flags) { uint8_t nal = buf[0]; uint8_t type = (nal & 0x1f); int result= 0; uint8_t start_sequence[]= {0, 0, 1}; #ifdef DEBUG assert(data); assert(data->cookie == MAGIC_COOKIE); #endif 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 = AV_RB16(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 >> 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; // skip the fu_header... buf++; len--; #ifdef DEBUG if (start_bit) data->packet_types_received[nal_type]++; #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 PayloadContext *h264_new_extradata(void) { PayloadContext *data = av_mallocz(sizeof(PayloadContext) + FF_INPUT_BUFFER_PADDING_SIZE); if (data) { data->cookie = MAGIC_COOKIE; } return data; } static void h264_free_extradata(PayloadContext *data) { #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(AVFormatContext *s, int st_index, PayloadContext *h264_data, const char *line) { AVStream *stream = s->streams[st_index]; AVCodecContext *codec = stream->codec; const char *p = line; assert(h264_data->cookie == MAGIC_COOKIE); if (av_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 (av_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 (av_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 };