| /* | |
| * RTP H.264 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 | |
| * @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) | |
| */ | |
| #include "libavutil/attributes.h" | |
| #include "libavutil/base64.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "libavutil/avstring.h" | |
| #include "avformat.h" | |
| #include "rtpdec.h" | |
| #include "rtpdec_formats.h" | |
| struct PayloadContext { | |
| // sdp setup parameters | |
| uint8_t profile_idc; | |
| uint8_t profile_iop; | |
| uint8_t level_idc; | |
| int packetization_mode; | |
| #ifdef DEBUG | |
| int packet_types_received[32]; | |
| #endif | |
| }; | |
| #ifdef DEBUG | |
| #define COUNT_NAL_TYPE(data, nal) data->packet_types_received[(nal) & 0x1f]++ | |
| #define NAL_COUNTERS data->packet_types_received | |
| #else | |
| #define COUNT_NAL_TYPE(data, nal) do { } while (0) | |
| #define NAL_COUNTERS NULL | |
| #endif | |
| #define NAL_MASK 0x1f | |
| static const uint8_t start_sequence[] = { 0, 0, 0, 1 }; | |
| static void parse_profile_level_id(AVFormatContext *s, | |
| PayloadContext *h264_data, | |
| const char *value) | |
| { | |
| 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); | |
| av_log(s, AV_LOG_DEBUG, | |
| "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; | |
| } | |
| int ff_h264_parse_sprop_parameter_sets(AVFormatContext *s, | |
| uint8_t **data_ptr, int *size_ptr, | |
| const char *value) | |
| { | |
| char base64packet[1024]; | |
| uint8_t decoded_packet[1024]; | |
| int packet_size; | |
| while (*value) { | |
| 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 > 0) { | |
| uint8_t *dest = av_realloc(*data_ptr, | |
| packet_size + sizeof(start_sequence) + | |
| *size_ptr + | |
| AV_INPUT_BUFFER_PADDING_SIZE); | |
| if (!dest) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Unable to allocate memory for extradata!\n"); | |
| return AVERROR(ENOMEM); | |
| } | |
| *data_ptr = dest; | |
| memcpy(dest + *size_ptr, start_sequence, | |
| sizeof(start_sequence)); | |
| memcpy(dest + *size_ptr + sizeof(start_sequence), | |
| decoded_packet, packet_size); | |
| memset(dest + *size_ptr + sizeof(start_sequence) + | |
| packet_size, 0, AV_INPUT_BUFFER_PADDING_SIZE); | |
| *size_ptr += sizeof(start_sequence) + packet_size; | |
| } | |
| } | |
| return 0; | |
| } | |
| static int sdp_parse_fmtp_config_h264(AVFormatContext *s, | |
| AVStream *stream, | |
| PayloadContext *h264_data, | |
| const char *attr, const char *value) | |
| { | |
| AVCodecParameters *par = stream->codecpar; | |
| if (!strcmp(attr, "packetization-mode")) { | |
| av_log(s, AV_LOG_DEBUG, "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(s, AV_LOG_ERROR, | |
| "Interleaved RTP mode is not supported yet.\n"); | |
| } else if (!strcmp(attr, "profile-level-id")) { | |
| if (strlen(value) == 6) | |
| parse_profile_level_id(s, h264_data, value); | |
| } else if (!strcmp(attr, "sprop-parameter-sets")) { | |
| int ret; | |
| if (*value == 0 || value[strlen(value) - 1] == ',') { | |
| av_log(s, AV_LOG_WARNING, "Missing PPS in sprop-parameter-sets, ignoring\n"); | |
| return 0; | |
| } | |
| par->extradata_size = 0; | |
| av_freep(&par->extradata); | |
| ret = ff_h264_parse_sprop_parameter_sets(s, &par->extradata, | |
| &par->extradata_size, value); | |
| av_log(s, AV_LOG_DEBUG, "Extradata set to %p (size: %d)\n", | |
| par->extradata, par->extradata_size); | |
| return ret; | |
| } | |
| return 0; | |
| } | |
| void ff_h264_parse_framesize(AVCodecParameters *par, const char *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 != '-' && (dst - buf1) < sizeof(buf1) - 1) | |
| *dst++ = *p++; | |
| *dst = '\0'; | |
| // a='framesize:96 320-240' | |
| // set our parameters | |
| par->width = atoi(buf1); | |
| par->height = atoi(p + 1); // skip the - | |
| } | |
| int ff_h264_handle_aggregated_packet(AVFormatContext *ctx, PayloadContext *data, AVPacket *pkt, | |
| const uint8_t *buf, int len, | |
| int skip_between, int *nal_counters, | |
| int nal_mask) | |
| { | |
| int pass = 0; | |
| int total_length = 0; | |
| uint8_t *dst = NULL; | |
| int ret; | |
| // first we are going to figure out the total size | |
| for (pass = 0; pass < 2; pass++) { | |
| const uint8_t *src = buf; | |
| int src_len = len; | |
| while (src_len > 2) { | |
| uint16_t nal_size = AV_RB16(src); | |
| // 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 | |
| memcpy(dst, start_sequence, sizeof(start_sequence)); | |
| dst += sizeof(start_sequence); | |
| memcpy(dst, src, nal_size); | |
| if (nal_counters) | |
| nal_counters[(*src) & nal_mask]++; | |
| dst += nal_size; | |
| } | |
| } else { | |
| av_log(ctx, AV_LOG_ERROR, | |
| "nal size exceeds length: %d %d\n", nal_size, src_len); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| // eat what we handled | |
| src += nal_size + skip_between; | |
| src_len -= nal_size + skip_between; | |
| } | |
| if (pass == 0) { | |
| /* now we know the total size of the packet (with the | |
| * start sequences added) */ | |
| if ((ret = av_new_packet(pkt, total_length)) < 0) | |
| return ret; | |
| dst = pkt->data; | |
| } | |
| } | |
| return 0; | |
| } | |
| int ff_h264_handle_frag_packet(AVPacket *pkt, const uint8_t *buf, int len, | |
| int start_bit, const uint8_t *nal_header, | |
| int nal_header_len) | |
| { | |
| int ret; | |
| int tot_len = len; | |
| int pos = 0; | |
| if (start_bit) | |
| tot_len += sizeof(start_sequence) + nal_header_len; | |
| if ((ret = av_new_packet(pkt, tot_len)) < 0) | |
| return ret; | |
| if (start_bit) { | |
| memcpy(pkt->data + pos, start_sequence, sizeof(start_sequence)); | |
| pos += sizeof(start_sequence); | |
| memcpy(pkt->data + pos, nal_header, nal_header_len); | |
| pos += nal_header_len; | |
| } | |
| memcpy(pkt->data + pos, buf, len); | |
| return 0; | |
| } | |
| static int h264_handle_packet_fu_a(AVFormatContext *ctx, PayloadContext *data, AVPacket *pkt, | |
| const uint8_t *buf, int len, | |
| int *nal_counters, int nal_mask) | |
| { | |
| uint8_t fu_indicator, fu_header, start_bit, nal_type, nal; | |
| if (len < 3) { | |
| av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H.264 RTP packet\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| fu_indicator = buf[0]; | |
| fu_header = buf[1]; | |
| start_bit = fu_header >> 7; | |
| nal_type = fu_header & 0x1f; | |
| nal = fu_indicator & 0xe0 | nal_type; | |
| // skip the fu_indicator and fu_header | |
| buf += 2; | |
| len -= 2; | |
| if (start_bit && nal_counters) | |
| nal_counters[nal_type & nal_mask]++; | |
| return ff_h264_handle_frag_packet(pkt, buf, len, start_bit, &nal, 1); | |
| } | |
| // 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, uint16_t seq, | |
| int flags) | |
| { | |
| uint8_t nal; | |
| uint8_t type; | |
| int result = 0; | |
| if (!len) { | |
| av_log(ctx, AV_LOG_ERROR, "Empty H.264 RTP packet\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| nal = buf[0]; | |
| type = nal & 0x1f; | |
| /* Simplify the case (these are all the NAL types used internally by | |
| * the H.264 codec). */ | |
| if (type >= 1 && type <= 23) | |
| type = 1; | |
| switch (type) { | |
| case 0: // undefined, but pass them through | |
| case 1: | |
| if ((result = av_new_packet(pkt, len + sizeof(start_sequence))) < 0) | |
| return result; | |
| memcpy(pkt->data, start_sequence, sizeof(start_sequence)); | |
| memcpy(pkt->data + sizeof(start_sequence), buf, len); | |
| COUNT_NAL_TYPE(data, nal); | |
| break; | |
| case 24: // STAP-A (one packet, multiple nals) | |
| // consume the STAP-A NAL | |
| buf++; | |
| len--; | |
| result = ff_h264_handle_aggregated_packet(ctx, data, pkt, buf, len, 0, | |
| NAL_COUNTERS, NAL_MASK); | |
| break; | |
| case 25: // STAP-B | |
| case 26: // MTAP-16 | |
| case 27: // MTAP-24 | |
| case 29: // FU-B | |
| avpriv_report_missing_feature(ctx, "RTP H.264 NAL unit type %d", type); | |
| result = AVERROR_PATCHWELCOME; | |
| break; | |
| case 28: // FU-A (fragmented nal) | |
| result = h264_handle_packet_fu_a(ctx, data, pkt, buf, len, | |
| NAL_COUNTERS, NAL_MASK); | |
| break; | |
| case 30: // undefined | |
| case 31: // undefined | |
| default: | |
| av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)\n", type); | |
| result = AVERROR_INVALIDDATA; | |
| break; | |
| } | |
| pkt->stream_index = st->index; | |
| return result; | |
| } | |
| static void h264_close_context(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 | |
| } | |
| static int parse_h264_sdp_line(AVFormatContext *s, int st_index, | |
| PayloadContext *h264_data, const char *line) | |
| { | |
| AVStream *stream; | |
| const char *p = line; | |
| if (st_index < 0) | |
| return 0; | |
| stream = s->streams[st_index]; | |
| if (av_strstart(p, "framesize:", &p)) { | |
| ff_h264_parse_framesize(stream->codecpar, p); | |
| } else if (av_strstart(p, "fmtp:", &p)) { | |
| return ff_parse_fmtp(s, stream, h264_data, p, sdp_parse_fmtp_config_h264); | |
| } else if (av_strstart(p, "cliprect:", &p)) { | |
| // could use this if we wanted. | |
| } | |
| return 0; | |
| } | |
| const RTPDynamicProtocolHandler ff_h264_dynamic_handler = { | |
| .enc_name = "H264", | |
| .codec_type = AVMEDIA_TYPE_VIDEO, | |
| .codec_id = AV_CODEC_ID_H264, | |
| .need_parsing = AVSTREAM_PARSE_FULL, | |
| .priv_data_size = sizeof(PayloadContext), | |
| .parse_sdp_a_line = parse_h264_sdp_line, | |
| .close = h264_close_context, | |
| .parse_packet = h264_handle_packet, | |
| }; |