rtpenc: packetizer for VC-2 HQ RTP payload format (draft v1)

1 files changed, 134 insertions, 0 deletions

diff --git a/libavformat/rtpenc_vc2hq.c b/libavformat/rtpenc_vc2hq.c
new file mode 100644
index 0000000000..deda62183a
--- /dev/null
+++ b/libavformat/rtpenc_vc2hq.c
@@ -0,0 +1,134 @@
+/*
+ * RTP packetizer for VC-2 HQ payload format (draft version 1) - experimental
+ * Copyright (c) 2016 Thomas Volkert <thomas@netzeal.de>
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "libavcodec/dirac.h"
+#include "libavcodec/get_bits.h"
+#include "libavcodec/golomb.h"
+
+#include "avformat.h"
+#include "rtpenc.h"
+
+#define RTP_VC2HQ_PL_HEADER_SIZE             4
+
+#define DIRAC_DATA_UNIT_HEADER_SIZE          13
+#define DIRAC_PIC_NR_SIZE                    4
+#define DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT      0xEC
+
+static void send_packet(AVFormatContext *ctx, uint8_t parse_code, int info_hdr_size, const uint8_t *buf, int size, int i, int f, int rtp_m)
+{
+    RTPMuxContext *rtp_ctx = ctx->priv_data;
+
+    AV_WB16(&rtp_ctx->buf[0], 0); /* extended sequence number */
+    AV_WB8 (&rtp_ctx->buf[2], i ? (f ? (0x03) : (0x02)) : 0x00); /* flags: interlaced, second field */
+    AV_WB8 (&rtp_ctx->buf[3], parse_code);
+    if (size > 0)
+        memcpy(&rtp_ctx->buf[4 + info_hdr_size], buf, size);
+    ff_rtp_send_data(ctx, rtp_ctx->buf, RTP_VC2HQ_PL_HEADER_SIZE + info_hdr_size + size, rtp_m);
+}
+
+static void send_picture(AVFormatContext *ctx, const uint8_t *buf, int size, int interlaced)
+{
+    RTPMuxContext *rtp_ctx = ctx->priv_data;
+    GetBitContext gc;
+    int lvl, second_field;
+    uint32_t pic_nr, wavelet_depth, prefix_bytes, size_scaler;
+    uint16_t frag_len;
+    char *info_hdr = &rtp_ctx->buf[4];
+
+    pic_nr = AV_RB32(&buf[0]);
+    buf += DIRAC_PIC_NR_SIZE;
+    size -= DIRAC_PIC_NR_SIZE;
+    second_field = interlaced && (pic_nr & 0x01);
+
+    init_get_bits(&gc, buf, 8  * size);
+                    svq3_get_ue_golomb(&gc); /* wavelet_idx */
+    wavelet_depth = svq3_get_ue_golomb(&gc);
+                    svq3_get_ue_golomb(&gc); /* num_x */
+                    svq3_get_ue_golomb(&gc); /* num_y */
+    prefix_bytes  = svq3_get_ue_golomb(&gc);
+    size_scaler   = svq3_get_ue_golomb(&gc);
+    /* pass the quantization matrices */
+    svq3_get_ue_golomb(&gc);
+    for(lvl = 0; lvl < wavelet_depth; lvl++)
+    {
+        svq3_get_ue_golomb(&gc);
+        svq3_get_ue_golomb(&gc);
+        svq3_get_ue_golomb(&gc);
+    }
+
+    frag_len = (get_bits_count(&gc) + 7) / 8; /* length of transform parameters */
+
+    AV_WB32(&info_hdr[ 0], pic_nr);
+    AV_WB16(&info_hdr[ 4], prefix_bytes);
+    AV_WB16(&info_hdr[ 6], size_scaler);
+    AV_WB16(&info_hdr[ 8], frag_len);
+    AV_WB16(&info_hdr[10], 0 /* nr. of slices */);
+    send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 12, buf, frag_len, interlaced, second_field, 0);
+    buf += frag_len;
+    size -= frag_len;
+
+    while (size > 0) {
+        frag_len = FFMIN(rtp_ctx->max_payload_size - 20 /* pl header */, size);
+        AV_WB16(&info_hdr[ 8], frag_len);
+        AV_WB16(&info_hdr[10], 1 /* nr. of slices */);
+        AV_WB16(&info_hdr[12], 0 /* slice x */);
+        AV_WB16(&info_hdr[14], 0 /* slice y */);
+
+        size -= frag_len;
+        send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 16, buf, frag_len, interlaced, second_field, size > 0 ? 0 : 1);
+        buf += frag_len;
+    }
+}
+
+void ff_rtp_send_vc2hq(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size, int interlaced)
+{
+    const uint8_t *end = frame_buf + frame_size;
+    const uint8_t *unit = frame_buf;
+    uint8_t parse_code;
+    uint32_t unit_size;
+
+    while (unit < end) {
+        parse_code = unit[4];
+        unit_size = AV_RB32(&unit[5]);
+
+        switch (parse_code) {
+        /* sequence header */
+        /* end of sequence */
+        case DIRAC_PCODE_SEQ_HEADER:
+        case DIRAC_PCODE_END_SEQ:
+            send_packet(ctx, parse_code, 0, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, 0, 0, 0);
+            break;
+        /* HQ picture */
+        case DIRAC_PCODE_PICTURE_HQ:
+            send_picture(ctx, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, interlaced);
+            break;
+        /* parse codes without specification */
+        case DIRAC_PCODE_AUX:
+        case DIRAC_PCODE_PAD:
+            break;
+        default:
+            avpriv_report_missing_feature(ctx, "VC-2 parse code %d", parse_code);
+            break;
+        }
+        unit += unit_size;
+    }
+}