| /* |
| * RTP packetization for H.264 (RFC3984) |
| * RTP packetizer for HEVC/H.265 payload format (draft version 6) |
| * Copyright (c) 2008 Luca Abeni |
| * Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com> |
| * |
| * 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/HEVC packetization |
| * @author Luca Abeni <lucabe72@email.it> |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| |
| #include "avformat.h" |
| #include "avc.h" |
| #include "rtpenc.h" |
| |
| static void flush_buffered(AVFormatContext *s1, int last) |
| { |
| RTPMuxContext *s = s1->priv_data; |
| if (s->buf_ptr != s->buf) { |
| // If we're only sending one single NAL unit, send it as such, skip |
| // the STAP-A/AP framing |
| if (s->buffered_nals == 1) { |
| enum AVCodecID codec = s1->streams[0]->codec->codec_id; |
| if (codec == AV_CODEC_ID_H264) |
| ff_rtp_send_data(s1, s->buf + 3, s->buf_ptr - s->buf - 3, last); |
| else |
| ff_rtp_send_data(s1, s->buf + 4, s->buf_ptr - s->buf - 4, last); |
| } else |
| ff_rtp_send_data(s1, s->buf, s->buf_ptr - s->buf, last); |
| } |
| s->buf_ptr = s->buf; |
| s->buffered_nals = 0; |
| } |
| |
| static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last) |
| { |
| RTPMuxContext *s = s1->priv_data; |
| enum AVCodecID codec = s1->streams[0]->codec->codec_id; |
| |
| av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last); |
| if (size <= s->max_payload_size) { |
| int buffered_size = s->buf_ptr - s->buf; |
| int header_size; |
| int skip_aggregate = 0; |
| |
| if (codec == AV_CODEC_ID_H264) { |
| header_size = 1; |
| skip_aggregate = s->flags & FF_RTP_FLAG_H264_MODE0; |
| } else { |
| header_size = 2; |
| } |
| |
| // Flush buffered NAL units if the current unit doesn't fit |
| if (buffered_size + 2 + size > s->max_payload_size) { |
| flush_buffered(s1, 0); |
| buffered_size = 0; |
| } |
| // If we aren't using mode 0, and the NAL unit fits including the |
| // framing (2 bytes length, plus 1/2 bytes for the STAP-A/AP marker), |
| // write the unit to the buffer as a STAP-A/AP packet, otherwise flush |
| // and send as single NAL. |
| if (buffered_size + 2 + header_size + size <= s->max_payload_size && |
| !skip_aggregate) { |
| if (buffered_size == 0) { |
| if (codec == AV_CODEC_ID_H264) { |
| *s->buf_ptr++ = 24; |
| } else { |
| *s->buf_ptr++ = 48 << 1; |
| *s->buf_ptr++ = 1; |
| } |
| } |
| AV_WB16(s->buf_ptr, size); |
| s->buf_ptr += 2; |
| memcpy(s->buf_ptr, buf, size); |
| s->buf_ptr += size; |
| s->buffered_nals++; |
| } else { |
| flush_buffered(s1, 0); |
| ff_rtp_send_data(s1, buf, size, last); |
| } |
| } else { |
| int flag_byte, header_size; |
| flush_buffered(s1, 0); |
| if (codec == AV_CODEC_ID_H264 && (s->flags & FF_RTP_FLAG_H264_MODE0)) { |
| av_log(s1, AV_LOG_ERROR, |
| "NAL size %d > %d, try -slice-max-size %d\n", size, |
| s->max_payload_size, s->max_payload_size); |
| return; |
| } |
| av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size); |
| if (codec == AV_CODEC_ID_H264) { |
| uint8_t type = buf[0] & 0x1F; |
| uint8_t nri = buf[0] & 0x60; |
| |
| s->buf[0] = 28; /* FU Indicator; Type = 28 ---> FU-A */ |
| s->buf[0] |= nri; |
| s->buf[1] = type; |
| s->buf[1] |= 1 << 7; |
| buf += 1; |
| size -= 1; |
| |
| flag_byte = 1; |
| header_size = 2; |
| } else { |
| uint8_t nal_type = (buf[0] >> 1) & 0x3F; |
| /* |
| * create the HEVC payload header and transmit the buffer as fragmentation units (FU) |
| * |
| * 0 1 |
| * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |F| Type | LayerId | TID | |
| * +-------------+-----------------+ |
| * |
| * F = 0 |
| * Type = 49 (fragmentation unit (FU)) |
| * LayerId = 0 |
| * TID = 1 |
| */ |
| s->buf[0] = 49 << 1; |
| s->buf[1] = 1; |
| |
| /* |
| * create the FU header |
| * |
| * 0 1 2 3 4 5 6 7 |
| * +-+-+-+-+-+-+-+-+ |
| * |S|E| FuType | |
| * +---------------+ |
| * |
| * S = variable |
| * E = variable |
| * FuType = NAL unit type |
| */ |
| s->buf[2] = nal_type; |
| /* set the S bit: mark as start fragment */ |
| s->buf[2] |= 1 << 7; |
| |
| /* pass the original NAL header */ |
| buf += 2; |
| size -= 2; |
| |
| flag_byte = 2; |
| header_size = 3; |
| } |
| |
| while (size + header_size > s->max_payload_size) { |
| memcpy(&s->buf[header_size], buf, s->max_payload_size - header_size); |
| ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0); |
| buf += s->max_payload_size - header_size; |
| size -= s->max_payload_size - header_size; |
| s->buf[flag_byte] &= ~(1 << 7); |
| } |
| s->buf[flag_byte] |= 1 << 6; |
| memcpy(&s->buf[header_size], buf, size); |
| ff_rtp_send_data(s1, s->buf, size + header_size, last); |
| } |
| } |
| |
| void ff_rtp_send_h264_hevc(AVFormatContext *s1, const uint8_t *buf1, int size) |
| { |
| const uint8_t *r, *end = buf1 + size; |
| RTPMuxContext *s = s1->priv_data; |
| |
| s->timestamp = s->cur_timestamp; |
| s->buf_ptr = s->buf; |
| if (s->nal_length_size) |
| r = ff_avc_mp4_find_startcode(buf1, end, s->nal_length_size) ? buf1 : end; |
| else |
| r = ff_avc_find_startcode(buf1, end); |
| while (r < end) { |
| const uint8_t *r1; |
| |
| if (s->nal_length_size) { |
| r1 = ff_avc_mp4_find_startcode(r, end, s->nal_length_size); |
| if (!r1) |
| r1 = end; |
| r += s->nal_length_size; |
| } else { |
| while (!*(r++)); |
| r1 = ff_avc_find_startcode(r, end); |
| } |
| nal_send(s1, r, r1 - r, r1 == end); |
| r = r1; |
| } |
| flush_buffered(s1, 1); |
| } |