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/*
* 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);
get_interleaved_ue_golomb(&gc); /* wavelet_idx */
wavelet_depth = get_interleaved_ue_golomb(&gc);
get_interleaved_ue_golomb(&gc); /* num_x */
get_interleaved_ue_golomb(&gc); /* num_y */
prefix_bytes = get_interleaved_ue_golomb(&gc);
size_scaler = get_interleaved_ue_golomb(&gc);
/* pass the quantization matrices */
get_interleaved_ue_golomb(&gc);
for(lvl = 0; lvl < wavelet_depth; lvl++)
{
get_interleaved_ue_golomb(&gc);
get_interleaved_ue_golomb(&gc);
get_interleaved_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;
}
}
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