| /* |
| * 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 <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 "libavutil/base64.h" |
| #include "libavutil/avstring.h" |
| #include "libavcodec/bitstream.h" |
| #include "avformat.h" |
| #include "mpegts.h" |
| |
| #include <unistd.h> |
| #include "network.h" |
| #include <assert.h> |
| |
| #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 |
| }; |
