X-Git-Url: https://git.piment-noir.org/?p=deb_ffmpeg.git;a=blobdiff_plain;f=ffmpeg%2Flibavformat%2Frtpenc_hevc.c;fp=ffmpeg%2Flibavformat%2Frtpenc_hevc.c;h=ce661fa1a8fb45df8345dc07aafef43d88680ed0;hp=0000000000000000000000000000000000000000;hb=f6fa7814ccfe3e76514b36cf04f5cd3cb657c8cf;hpb=2ba45a602cbfa7b771effba9b11bb4245c21bc00

diff --git a/ffmpeg/libavformat/rtpenc_hevc.c b/ffmpeg/libavformat/rtpenc_hevc.c
new file mode 100644
index 0000000..ce661fa
--- /dev/null
+++ b/ffmpeg/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 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
+ */
+
+#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;
+    }
+}