| /* |
| * 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 |
| * @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/avstring.h" |
| #include "libavcodec/get_bits.h" |
| #include "avformat.h" |
| |
| #include "network.h" |
| #include <assert.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]++ |
| #else |
| #define COUNT_NAL_TYPE(data, nal) do { } while (0) |
| #endif |
| |
| static const uint8_t start_sequence[] = { 0, 0, 0, 1 }; |
| |
| static int sdp_parse_fmtp_config_h264(AVStream *stream, |
| PayloadContext *h264_data, |
| char *attr, char *value) |
| { |
| AVCodecContext *codec = stream->codec; |
| assert(codec->codec_id == AV_CODEC_ID_H264); |
| assert(h264_data != NULL); |
| |
| if (!strcmp(attr, "packetization-mode")) { |
| av_log(codec, 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(codec, AV_LOG_ERROR, |
| "Interleaved RTP mode is not supported yet.\n"); |
| } 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); |
| |
| av_log(codec, 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; |
| } |
| } else if (!strcmp(attr, "sprop-parameter-sets")) { |
| codec->extradata_size = 0; |
| av_freep(&codec->extradata); |
| |
| while (*value) { |
| char base64packet[1024]; |
| uint8_t decoded_packet[1024]; |
| int 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 > 0) { |
| uint8_t *dest = av_malloc(packet_size + sizeof(start_sequence) + |
| codec->extradata_size + |
| FF_INPUT_BUFFER_PADDING_SIZE); |
| if (!dest) { |
| av_log(codec, AV_LOG_ERROR, |
| "Unable to allocate memory for extradata!\n"); |
| return AVERROR(ENOMEM); |
| } |
| if (codec->extradata_size) { |
| 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); |
| memset(dest + codec->extradata_size + sizeof(start_sequence) + |
| packet_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
| |
| codec->extradata = dest; |
| codec->extradata_size += sizeof(start_sequence) + packet_size; |
| } |
| } |
| av_log(codec, AV_LOG_DEBUG, "Extradata set to %p (size: %d)!\n", |
| codec->extradata, codec->extradata_size); |
| } |
| return 0; |
| } |
| |
| // 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 H264 RTP packet\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| nal = buf[0]; |
| type = nal & 0x1f; |
| |
| assert(data); |
| assert(buf); |
| |
| /* Simplify the case (these are all the nal types used internally by |
| * the h264 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--; |
| // 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; |
| |
| 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 |
| assert(dst); |
| memcpy(dst, start_sequence, sizeof(start_sequence)); |
| dst += sizeof(start_sequence); |
| memcpy(dst, src, nal_size); |
| COUNT_NAL_TYPE(data, *src); |
| dst += nal_size; |
| } |
| } else { |
| av_log(ctx, 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(ctx, AV_LOG_ERROR, |
| "Consumed more bytes than we got! (%d)\n", src_len); |
| } |
| |
| if (pass == 0) { |
| /* now we know the total size of the packet (with the |
| * start sequences added) */ |
| if ((result = av_new_packet(pkt, total_length)) < 0) |
| return result; |
| 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(ctx, AV_LOG_ERROR, |
| "Unhandled type (%d) (See RFC for implementation details\n", |
| type); |
| result = AVERROR(ENOSYS); |
| break; |
| |
| case 28: // FU-A (fragmented nal) |
| buf++; |
| len--; // skip the fu_indicator |
| if (len > 1) { |
| // these are the same as above, we just redo them here for clarity |
| uint8_t fu_indicator = nal; |
| uint8_t fu_header = *buf; |
| uint8_t start_bit = fu_header >> 7; |
| uint8_t av_unused 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. |
| /* The original nal forbidden bit and NRI are stored in this |
| * packet's nal. */ |
| reconstructed_nal = fu_indicator & 0xe0; |
| reconstructed_nal |= nal_type; |
| |
| // skip the fu_header |
| buf++; |
| len--; |
| |
| if (start_bit) |
| COUNT_NAL_TYPE(data, nal_type); |
| if (start_bit) { |
| /* copy in the start sequence, and the reconstructed nal */ |
| if ((result = av_new_packet(pkt, sizeof(start_sequence) + sizeof(nal) + len)) < 0) |
| return result; |
| 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 { |
| if ((result = av_new_packet(pkt, len)) < 0) |
| return result; |
| memcpy(pkt->data, buf, len); |
| } |
| } else { |
| av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H264 RTP packet\n"); |
| result = AVERROR_INVALIDDATA; |
| } |
| 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 PayloadContext *h264_new_context(void) |
| { |
| return av_mallocz(sizeof(PayloadContext) + FF_INPUT_BUFFER_PADDING_SIZE); |
| } |
| |
| static void h264_free_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 |
| |
| av_free(data); |
| } |
| |
| static av_cold int h264_init(AVFormatContext *s, int st_index, |
| PayloadContext *data) |
| { |
| if (st_index < 0) |
| return 0; |
| s->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL; |
| return 0; |
| } |
| |
| static int parse_h264_sdp_line(AVFormatContext *s, int st_index, |
| PayloadContext *h264_data, const char *line) |
| { |
| AVStream *stream; |
| AVCodecContext *codec; |
| const char *p = line; |
| |
| if (st_index < 0) |
| return 0; |
| |
| stream = s->streams[st_index]; |
| codec = stream->codec; |
| |
| 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 != '-' && (dst - buf1) < 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 - |
| } else if (av_strstart(p, "fmtp:", &p)) { |
| return ff_parse_fmtp(stream, h264_data, p, sdp_parse_fmtp_config_h264); |
| } else if (av_strstart(p, "cliprect:", &p)) { |
| // could use this if we wanted. |
| } |
| |
| return 0; |
| } |
| |
| RTPDynamicProtocolHandler ff_h264_dynamic_handler = { |
| .enc_name = "H264", |
| .codec_type = AVMEDIA_TYPE_VIDEO, |
| .codec_id = AV_CODEC_ID_H264, |
| .init = h264_init, |
| .parse_sdp_a_line = parse_h264_sdp_line, |
| .alloc = h264_new_context, |
| .free = h264_free_context, |
| .parse_packet = h264_handle_packet |
| }; |
