| /* |
| * RTP packetization for H.264 (RFC3984) |
| * Copyright (c) 2008 Luca Abeni |
| * |
| * 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 packetization |
| * @author Luca Abeni <lucabe72@email.it> |
| */ |
| |
| #include "avformat.h" |
| #include "avc.h" |
| #include "rtpenc.h" |
| |
| static const uint8_t *avc_mp4_find_startcode(const uint8_t *start, const uint8_t *end, int nal_length_size) |
| { |
| unsigned int res = 0; |
| |
| if (end - start < nal_length_size) |
| return NULL; |
| while (nal_length_size--) |
| res = (res << 8) | *start++; |
| |
| if (res > end - start) |
| return NULL; |
| |
| return start + res; |
| } |
| |
| static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last) |
| { |
| RTPMuxContext *s = s1->priv_data; |
| |
| 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) { |
| ff_rtp_send_data(s1, buf, size, last); |
| } else { |
| uint8_t type = buf[0] & 0x1F; |
| uint8_t nri = buf[0] & 0x60; |
| |
| if (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); |
| 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; |
| while (size + 2 > s->max_payload_size) { |
| memcpy(&s->buf[2], buf, s->max_payload_size - 2); |
| ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0); |
| buf += s->max_payload_size - 2; |
| size -= s->max_payload_size - 2; |
| s->buf[1] &= ~(1 << 7); |
| } |
| s->buf[1] |= 1 << 6; |
| memcpy(&s->buf[2], buf, size); |
| ff_rtp_send_data(s1, s->buf, size + 2, last); |
| } |
| } |
| |
| void ff_rtp_send_h264(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; |
| if (s->nal_length_size) |
| r = 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 = 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; |
| } |
| } |