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409 lines
14 KiB
409 lines
14 KiB
/* |
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* RTP H264 Protocol (RFC3984) |
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* Copyright (c) 2006 Ryan Martell |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* @brief H.264 / RTP Code (RFC3984) |
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* @author Ryan Martell <rdm4@martellventures.com> |
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* |
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* @note Notes: |
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* Notes: |
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* This currently supports packetization mode: |
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* Single Nal Unit Mode (0), or |
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* Non-Interleaved Mode (1). It currently does not support |
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* Interleaved Mode (2). (This requires implementing STAP-B, MTAP16, MTAP24, FU-B packet types) |
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* |
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* @note TODO: |
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* 1) RTCP sender reports for udp streams are required.. |
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* |
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*/ |
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#include "libavutil/base64.h" |
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#include "libavutil/avstring.h" |
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#include "libavcodec/get_bits.h" |
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#include "avformat.h" |
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#include "mpegts.h" |
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#include <unistd.h> |
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#include "network.h" |
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#include <assert.h> |
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#include "rtpdec.h" |
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#include "rtpdec_formats.h" |
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/** |
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RTP/H264 specific private data. |
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*/ |
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struct PayloadContext { |
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unsigned long cookie; ///< sanity check, to make sure we get the pointer we're expecting. |
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//sdp setup parameters |
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uint8_t profile_idc; ///< from the sdp setup parameters. |
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uint8_t profile_iop; ///< from the sdp setup parameters. |
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uint8_t level_idc; ///< from the sdp setup parameters. |
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int packetization_mode; ///< from the sdp setup parameters. |
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#ifdef DEBUG |
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int packet_types_received[32]; |
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#endif |
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}; |
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#define MAGIC_COOKIE (0xdeadbeef) ///< Cookie for the extradata; to verify we are what we think we are, and that we haven't been freed. |
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#define DEAD_COOKIE (0xdeaddead) ///< Cookie for the extradata; once it is freed. |
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/* ---------------- private code */ |
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static int sdp_parse_fmtp_config_h264(AVStream * stream, |
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PayloadContext * h264_data, |
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char *attr, char *value) |
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{ |
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AVCodecContext *codec = stream->codec; |
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assert(codec->codec_id == CODEC_ID_H264); |
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assert(h264_data != NULL); |
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if (!strcmp(attr, "packetization-mode")) { |
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av_log(codec, AV_LOG_DEBUG, "RTP Packetization Mode: %d\n", atoi(value)); |
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h264_data->packetization_mode = atoi(value); |
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/* |
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Packetization Mode: |
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0 or not present: Single NAL mode (Only nals from 1-23 are allowed) |
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1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed. |
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2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), and 29 (FU-B) are allowed. |
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*/ |
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if (h264_data->packetization_mode > 1) |
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av_log(codec, AV_LOG_ERROR, |
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"Interleaved RTP mode is not supported yet."); |
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} else if (!strcmp(attr, "profile-level-id")) { |
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if (strlen(value) == 6) { |
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char buffer[3]; |
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// 6 characters=3 bytes, in hex. |
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uint8_t profile_idc; |
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uint8_t profile_iop; |
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uint8_t level_idc; |
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buffer[0] = value[0]; buffer[1] = value[1]; buffer[2] = '\0'; |
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profile_idc = strtol(buffer, NULL, 16); |
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buffer[0] = value[2]; buffer[1] = value[3]; |
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profile_iop = strtol(buffer, NULL, 16); |
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buffer[0] = value[4]; buffer[1] = value[5]; |
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level_idc = strtol(buffer, NULL, 16); |
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// set the parameters... |
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av_log(codec, AV_LOG_DEBUG, |
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"RTP Profile IDC: %x Profile IOP: %x Level: %x\n", |
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profile_idc, profile_iop, level_idc); |
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h264_data->profile_idc = profile_idc; |
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h264_data->profile_iop = profile_iop; |
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h264_data->level_idc = level_idc; |
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} |
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} else if (!strcmp(attr, "sprop-parameter-sets")) { |
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uint8_t start_sequence[] = { 0, 0, 0, 1 }; |
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codec->extradata_size= 0; |
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codec->extradata= NULL; |
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while (*value) { |
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char base64packet[1024]; |
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uint8_t decoded_packet[1024]; |
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int packet_size; |
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char *dst = base64packet; |
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while (*value && *value != ',' |
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&& (dst - base64packet) < sizeof(base64packet) - 1) { |
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*dst++ = *value++; |
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} |
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*dst++ = '\0'; |
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if (*value == ',') |
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value++; |
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packet_size= av_base64_decode(decoded_packet, base64packet, sizeof(decoded_packet)); |
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if (packet_size > 0) { |
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uint8_t *dest = av_malloc(packet_size + sizeof(start_sequence) + |
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codec->extradata_size + |
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FF_INPUT_BUFFER_PADDING_SIZE); |
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if(dest) |
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{ |
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if(codec->extradata_size) |
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{ |
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// av_realloc? |
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memcpy(dest, codec->extradata, codec->extradata_size); |
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av_free(codec->extradata); |
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} |
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memcpy(dest+codec->extradata_size, start_sequence, sizeof(start_sequence)); |
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memcpy(dest+codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size); |
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memset(dest+codec->extradata_size+sizeof(start_sequence)+ |
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packet_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
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codec->extradata= dest; |
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codec->extradata_size+= sizeof(start_sequence)+packet_size; |
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} else { |
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av_log(codec, AV_LOG_ERROR, "Unable to allocate memory for extradata!"); |
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return AVERROR(ENOMEM); |
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} |
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} |
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} |
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av_log(codec, AV_LOG_DEBUG, "Extradata set to %p (size: %d)!", codec->extradata, codec->extradata_size); |
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} |
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return 0; |
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} |
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// return 0 on packet, no more left, 1 on packet, 1 on partial packet... |
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static int h264_handle_packet(AVFormatContext *ctx, |
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PayloadContext *data, |
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AVStream *st, |
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AVPacket * pkt, |
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uint32_t * timestamp, |
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const uint8_t * buf, |
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int len, int flags) |
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{ |
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uint8_t nal = buf[0]; |
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uint8_t type = (nal & 0x1f); |
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int result= 0; |
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uint8_t start_sequence[] = { 0, 0, 0, 1 }; |
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#ifdef DEBUG |
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assert(data); |
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assert(data->cookie == MAGIC_COOKIE); |
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#endif |
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assert(buf); |
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if (type >= 1 && type <= 23) |
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type = 1; // simplify the case. (these are all the nal types used internally by the h264 codec) |
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switch (type) { |
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case 0: // undefined, but pass them through |
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case 1: |
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av_new_packet(pkt, len+sizeof(start_sequence)); |
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memcpy(pkt->data, start_sequence, sizeof(start_sequence)); |
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memcpy(pkt->data+sizeof(start_sequence), buf, len); |
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#ifdef DEBUG |
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data->packet_types_received[nal & 0x1f]++; |
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#endif |
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break; |
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case 24: // STAP-A (one packet, multiple nals) |
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// consume the STAP-A NAL |
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buf++; |
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len--; |
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// first we are going to figure out the total size.... |
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{ |
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int pass= 0; |
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int total_length= 0; |
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uint8_t *dst= NULL; |
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for(pass= 0; pass<2; pass++) { |
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const uint8_t *src= buf; |
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int src_len= len; |
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do { |
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uint16_t nal_size = AV_RB16(src); // this going to be a problem if unaligned (can it be?) |
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// consume the length of the aggregate... |
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src += 2; |
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src_len -= 2; |
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if (nal_size <= src_len) { |
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if(pass==0) { |
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// counting... |
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total_length+= sizeof(start_sequence)+nal_size; |
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} else { |
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// copying |
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assert(dst); |
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memcpy(dst, start_sequence, sizeof(start_sequence)); |
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dst+= sizeof(start_sequence); |
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memcpy(dst, src, nal_size); |
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#ifdef DEBUG |
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data->packet_types_received[*src & 0x1f]++; |
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#endif |
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dst+= nal_size; |
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} |
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} else { |
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av_log(ctx, AV_LOG_ERROR, |
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"nal size exceeds length: %d %d\n", nal_size, src_len); |
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} |
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// eat what we handled... |
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src += nal_size; |
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src_len -= nal_size; |
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if (src_len < 0) |
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av_log(ctx, AV_LOG_ERROR, |
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"Consumed more bytes than we got! (%d)\n", src_len); |
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} while (src_len > 2); // because there could be rtp padding.. |
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if(pass==0) { |
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// now we know the total size of the packet (with the start sequences added) |
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av_new_packet(pkt, total_length); |
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dst= pkt->data; |
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} else { |
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assert(dst-pkt->data==total_length); |
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} |
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} |
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} |
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break; |
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case 25: // STAP-B |
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case 26: // MTAP-16 |
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case 27: // MTAP-24 |
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case 29: // FU-B |
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av_log(ctx, AV_LOG_ERROR, |
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"Unhandled type (%d) (See RFC for implementation details\n", |
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type); |
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result= -1; |
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break; |
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case 28: // FU-A (fragmented nal) |
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buf++; |
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len--; // skip the fu_indicator |
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{ |
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// these are the same as above, we just redo them here for clarity... |
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uint8_t fu_indicator = nal; |
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uint8_t fu_header = *buf; // read the fu_header. |
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uint8_t start_bit = fu_header >> 7; |
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// uint8_t end_bit = (fu_header & 0x40) >> 6; |
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uint8_t nal_type = (fu_header & 0x1f); |
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uint8_t reconstructed_nal; |
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// reconstruct this packet's true nal; only the data follows.. |
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reconstructed_nal = fu_indicator & (0xe0); // the original nal forbidden bit and NRI are stored in this packet's nal; |
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reconstructed_nal |= nal_type; |
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// skip the fu_header... |
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buf++; |
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len--; |
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#ifdef DEBUG |
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if (start_bit) |
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data->packet_types_received[nal_type]++; |
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#endif |
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if(start_bit) { |
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// copy in the start sequence, and the reconstructed nal.... |
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av_new_packet(pkt, sizeof(start_sequence)+sizeof(nal)+len); |
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memcpy(pkt->data, start_sequence, sizeof(start_sequence)); |
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pkt->data[sizeof(start_sequence)]= reconstructed_nal; |
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memcpy(pkt->data+sizeof(start_sequence)+sizeof(nal), buf, len); |
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} else { |
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av_new_packet(pkt, len); |
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memcpy(pkt->data, buf, len); |
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} |
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} |
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break; |
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case 30: // undefined |
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case 31: // undefined |
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default: |
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av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)", type); |
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result= -1; |
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break; |
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} |
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pkt->stream_index = st->index; |
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return result; |
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} |
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/* ---------------- public code */ |
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static PayloadContext *h264_new_context(void) |
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{ |
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PayloadContext *data = |
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av_mallocz(sizeof(PayloadContext) + |
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FF_INPUT_BUFFER_PADDING_SIZE); |
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if (data) { |
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data->cookie = MAGIC_COOKIE; |
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} |
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return data; |
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} |
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static void h264_free_context(PayloadContext *data) |
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{ |
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#ifdef DEBUG |
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int ii; |
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for (ii = 0; ii < 32; ii++) { |
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if (data->packet_types_received[ii]) |
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av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n", |
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data->packet_types_received[ii], ii); |
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} |
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#endif |
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assert(data); |
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assert(data->cookie == MAGIC_COOKIE); |
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// avoid stale pointers (assert) |
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data->cookie = DEAD_COOKIE; |
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// and clear out this... |
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av_free(data); |
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} |
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static int parse_h264_sdp_line(AVFormatContext *s, int st_index, |
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PayloadContext *h264_data, const char *line) |
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{ |
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AVStream *stream; |
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AVCodecContext *codec; |
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const char *p = line; |
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if (st_index < 0) |
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return 0; |
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stream = s->streams[st_index]; |
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codec = stream->codec; |
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assert(h264_data->cookie == MAGIC_COOKIE); |
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if (av_strstart(p, "framesize:", &p)) { |
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char buf1[50]; |
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char *dst = buf1; |
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// remove the protocol identifier.. |
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while (*p && *p == ' ') p++; // strip spaces. |
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while (*p && *p != ' ') p++; // eat protocol identifier |
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while (*p && *p == ' ') p++; // strip trailing spaces. |
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while (*p && *p != '-' && (dst - buf1) < sizeof(buf1) - 1) { |
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*dst++ = *p++; |
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} |
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*dst = '\0'; |
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// a='framesize:96 320-240' |
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// set our parameters.. |
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codec->width = atoi(buf1); |
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codec->height = atoi(p + 1); // skip the - |
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codec->pix_fmt = PIX_FMT_YUV420P; |
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} else if (av_strstart(p, "fmtp:", &p)) { |
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return ff_parse_fmtp(stream, h264_data, p, sdp_parse_fmtp_config_h264); |
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} else if (av_strstart(p, "cliprect:", &p)) { |
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// could use this if we wanted. |
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} |
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return 0; // keep processing it the normal way... |
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} |
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/** |
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This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!) |
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*/ |
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RTPDynamicProtocolHandler ff_h264_dynamic_handler = { |
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.enc_name = "H264", |
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.codec_type = AVMEDIA_TYPE_VIDEO, |
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.codec_id = CODEC_ID_H264, |
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.parse_sdp_a_line = parse_h264_sdp_line, |
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.alloc = h264_new_context, |
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.free = h264_free_context, |
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.parse_packet = h264_handle_packet |
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};
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