413 lines
14 KiB
C
413 lines
14 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 rtp_h264.c
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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 "avformat.h"
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#include "mpegts.h"
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#include "bitstream.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 "rtp_internal.h"
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#include "rtp_h264.h"
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#include "base64.h"
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#include "avstring.h"
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/**
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RTP/H264 specific private data.
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*/
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typedef struct h264_rtp_extra_data {
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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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} h264_rtp_extra_data;
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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 void sdp_parse_fmtp_config_h264(AVStream * stream,
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h264_rtp_extra_data * 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(NULL, AV_LOG_DEBUG, "H.264/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(stream, AV_LOG_ERROR,
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"H.264/RTP 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(NULL, AV_LOG_DEBUG,
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"H.264/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, 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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uint32_t 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) {
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uint8_t *dest= av_malloc(packet_size+sizeof(start_sequence)+codec->extradata_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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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(NULL, AV_LOG_ERROR, "H.264/RTP Unable to allocate memory for extradata!");
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}
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}
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}
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av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Extradata set to %p (size: %d)!", codec->extradata, codec->extradata_size);
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}
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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(RTPDemuxContext * s,
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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)
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{
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h264_rtp_extra_data *data = s->dynamic_protocol_context;
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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, 1};
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assert(data);
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assert(data->cookie == MAGIC_COOKIE);
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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;
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result= -1;
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break;
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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(NULL, 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(NULL, 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(NULL, 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(NULL, 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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return result;
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}
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/* ---------------- public code */
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static void *h264_new_extradata(void)
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{
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h264_rtp_extra_data *data =
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av_mallocz(sizeof(h264_rtp_extra_data) +
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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_extradata(void *d)
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{
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h264_rtp_extra_data *data = (h264_rtp_extra_data *) d;
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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(AVStream * stream, void *data,
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const char *line)
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{
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AVCodecContext *codec = stream->codec;
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h264_rtp_extra_data *h264_data = (h264_rtp_extra_data *) data;
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const char *p = line;
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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 != '-' && (buf1 - dst) < 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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char attr[256];
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char value[4096];
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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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/* loop on each attribute */
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while (rtsp_next_attr_and_value
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(&p, attr, sizeof(attr), value, sizeof(value))) {
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/* grab the codec extra_data from the config parameter of the fmtp line */
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sdp_parse_fmtp_config_h264(stream, h264_data, attr, value);
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}
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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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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)
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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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"H264",
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CODEC_TYPE_VIDEO,
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CODEC_ID_H264,
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parse_h264_sdp_line,
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h264_new_extradata,
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h264_free_extradata,
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h264_handle_packet
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};
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