diff options
Diffstat (limited to 'libavformat/rtpenc_hevc.c')
| -rw-r--r-- | libavformat/rtpenc_hevc.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libavformat/rtpenc_hevc.c b/libavformat/rtpenc_hevc.c new file mode 100644 index 0000000000..c6474dcdaa --- /dev/null +++ b/libavformat/rtpenc_hevc.c @@ -0,0 +1,130 @@ +/* + * RTP packetizer for HEVC/H.265 payload format (draft version 6) + * Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com> + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avc.h" +#include "avformat.h" +#include "rtpenc.h" + +#define RTP_HEVC_HEADERS_SIZE 3 + +static void nal_send(AVFormatContext *ctx, const uint8_t *buf, int len, int last_packet_of_frame) +{ + RTPMuxContext *rtp_ctx = ctx->priv_data; + int rtp_payload_size = rtp_ctx->max_payload_size - RTP_HEVC_HEADERS_SIZE; + int nal_type = (buf[0] >> 1) & 0x3F; + + /* send it as one single NAL unit? */ + if (len <= rtp_ctx->max_payload_size) { + /* use the original NAL unit buffer and transmit it as RTP payload */ + ff_rtp_send_data(ctx, buf, len, last_packet_of_frame); + } else { + /* + 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 + */ + rtp_ctx->buf[0] = 49 << 1; + rtp_ctx->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 + */ + rtp_ctx->buf[2] = nal_type; + /* set the S bit: mark as start fragment */ + rtp_ctx->buf[2] |= 1 << 7; + + /* pass the original NAL header */ + buf += 2; + len -= 2; + + while (len > rtp_payload_size) { + /* complete and send current RTP packet */ + memcpy(&rtp_ctx->buf[RTP_HEVC_HEADERS_SIZE], buf, rtp_payload_size); + ff_rtp_send_data(ctx, rtp_ctx->buf, rtp_ctx->max_payload_size, 0); + + buf += rtp_payload_size; + len -= rtp_payload_size; + + /* reset the S bit */ + rtp_ctx->buf[2] &= ~(1 << 7); + } + + /* set the E bit: mark as last fragment */ + rtp_ctx->buf[2] |= 1 << 6; + + /* complete and send last RTP packet */ + memcpy(&rtp_ctx->buf[RTP_HEVC_HEADERS_SIZE], buf, len); + ff_rtp_send_data(ctx, rtp_ctx->buf, len + 2, last_packet_of_frame); + } +} + +void ff_rtp_send_hevc(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size) +{ + const uint8_t *next_NAL_unit; + const uint8_t *buf_ptr, *buf_end = frame_buf + frame_size; + RTPMuxContext *rtp_ctx = ctx->priv_data; + + /* use the default 90 KHz time stamp */ + rtp_ctx->timestamp = rtp_ctx->cur_timestamp; + + if (rtp_ctx->nal_length_size) + buf_ptr = ff_avc_mp4_find_startcode(frame_buf, buf_end, rtp_ctx->nal_length_size) ? frame_buf : buf_end; + else + buf_ptr = ff_avc_find_startcode(frame_buf, buf_end); + + /* find all NAL units and send them as separate packets */ + while (buf_ptr < buf_end) { + if (rtp_ctx->nal_length_size) { + next_NAL_unit = ff_avc_mp4_find_startcode(buf_ptr, buf_end, rtp_ctx->nal_length_size); + if (!next_NAL_unit) + next_NAL_unit = buf_end; + + buf_ptr += rtp_ctx->nal_length_size; + } else { + while (!*(buf_ptr++)) + ; + next_NAL_unit = ff_avc_find_startcode(buf_ptr, buf_end); + } + /* send the next NAL unit */ + nal_send(ctx, buf_ptr, next_NAL_unit - buf_ptr, next_NAL_unit == buf_end); + + /* jump to the next NAL unit */ + buf_ptr = next_NAL_unit; + } +} |