mirror of https://git.ffmpeg.org/ffmpeg.git
391 lines
13 KiB
C
391 lines
13 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 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,
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* FU-B packet types)
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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 "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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struct PayloadContext {
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// sdp setup parameters
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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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int packetization_mode;
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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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#ifdef DEBUG
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#define COUNT_NAL_TYPE(data, nal) data->packet_types_received[(nal) & 0x1f]++
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#else
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#define COUNT_NAL_TYPE(data, nal) do { } while (0)
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#endif
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static const uint8_t start_sequence[] = { 0, 0, 0, 1 };
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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 == AV_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),
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* 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.\n");
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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];
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buffer[1] = value[1];
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buffer[2] = '\0';
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profile_idc = strtol(buffer, NULL, 16);
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buffer[0] = value[2];
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buffer[1] = value[3];
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profile_iop = strtol(buffer, NULL, 16);
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buffer[0] = value[4];
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buffer[1] = value[5];
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level_idc = strtol(buffer, NULL, 16);
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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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codec->extradata_size = 0;
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av_freep(&codec->extradata);
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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,
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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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av_log(codec, AV_LOG_ERROR,
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"Unable to allocate memory for extradata!\n");
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return AVERROR(ENOMEM);
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}
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if (codec->extradata_size) {
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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,
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sizeof(start_sequence));
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memcpy(dest + codec->extradata_size + sizeof(start_sequence),
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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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}
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}
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av_log(codec, AV_LOG_DEBUG, "Extradata set to %p (size: %d)!\n",
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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, PayloadContext *data,
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AVStream *st, AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, uint16_t seq,
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int flags)
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{
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uint8_t nal;
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uint8_t type;
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int result = 0;
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if (!len) {
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av_log(ctx, AV_LOG_ERROR, "Empty H264 RTP packet\n");
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return AVERROR_INVALIDDATA;
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}
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nal = buf[0];
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type = nal & 0x1f;
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assert(data);
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assert(buf);
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/* Simplify the case (these are all the nal types used internally by
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* the h264 codec). */
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if (type >= 1 && type <= 23)
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type = 1;
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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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COUNT_NAL_TYPE(data, nal);
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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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while (src_len > 2) {
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uint16_t nal_size = AV_RB16(src);
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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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COUNT_NAL_TYPE(data, *src);
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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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}
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if (pass == 0) {
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/* now we know the total size of the packet (with the
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* 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 = AVERROR(ENOSYS);
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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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if (len > 1) {
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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;
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uint8_t start_bit = fu_header >> 7;
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uint8_t av_unused 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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/* The original nal forbidden bit and NRI are stored in this
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* packet's nal. */
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reconstructed_nal = fu_indicator & 0xe0;
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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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if (start_bit)
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COUNT_NAL_TYPE(data, nal_type);
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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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} else {
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av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H264 RTP packet\n");
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result = AVERROR_INVALIDDATA;
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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)\n", type);
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result = AVERROR_INVALIDDATA;
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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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static PayloadContext *h264_new_context(void)
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{
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return av_mallocz(sizeof(PayloadContext) + FF_INPUT_BUFFER_PADDING_SIZE);
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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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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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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 == ' ')
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p++; // strip spaces.
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while (*p && *p != ' ')
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p++; // eat protocol identifier
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while (*p && *p == ' ')
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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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*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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} 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;
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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 = AV_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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