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![Hendrik Leppkes](/assets/img/avatar_default.png)
* commit '4024b566d664a4b161d677554be52f32e7ad4236': golomb: Give svq3_get_se_golomb()/svq3_get_ue_golomb() better names Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
135 lines
4.9 KiB
C
135 lines
4.9 KiB
C
/*
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* RTP packetizer for VC-2 HQ payload format (draft version 1) - experimental
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* Copyright (c) 2016 Thomas Volkert <thomas@netzeal.de>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/dirac.h"
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#include "libavcodec/get_bits.h"
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#include "libavcodec/golomb.h"
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#include "avformat.h"
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#include "rtpenc.h"
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#define RTP_VC2HQ_PL_HEADER_SIZE 4
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#define DIRAC_DATA_UNIT_HEADER_SIZE 13
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#define DIRAC_PIC_NR_SIZE 4
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#define DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT 0xEC
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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)
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{
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RTPMuxContext *rtp_ctx = ctx->priv_data;
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AV_WB16(&rtp_ctx->buf[0], 0); /* extended sequence number */
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AV_WB8 (&rtp_ctx->buf[2], i ? (f ? (0x03) : (0x02)) : 0x00); /* flags: interlaced, second field */
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AV_WB8 (&rtp_ctx->buf[3], parse_code);
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if (size > 0)
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memcpy(&rtp_ctx->buf[4 + info_hdr_size], buf, size);
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ff_rtp_send_data(ctx, rtp_ctx->buf, RTP_VC2HQ_PL_HEADER_SIZE + info_hdr_size + size, rtp_m);
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}
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static void send_picture(AVFormatContext *ctx, const uint8_t *buf, int size, int interlaced)
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{
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RTPMuxContext *rtp_ctx = ctx->priv_data;
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GetBitContext gc;
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int lvl, second_field;
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uint32_t pic_nr, wavelet_depth, prefix_bytes, size_scaler;
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uint16_t frag_len;
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char *info_hdr = &rtp_ctx->buf[4];
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pic_nr = AV_RB32(&buf[0]);
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buf += DIRAC_PIC_NR_SIZE;
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size -= DIRAC_PIC_NR_SIZE;
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second_field = interlaced && (pic_nr & 0x01);
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init_get_bits(&gc, buf, 8 * size);
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get_interleaved_ue_golomb(&gc); /* wavelet_idx */
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wavelet_depth = get_interleaved_ue_golomb(&gc);
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get_interleaved_ue_golomb(&gc); /* num_x */
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get_interleaved_ue_golomb(&gc); /* num_y */
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prefix_bytes = get_interleaved_ue_golomb(&gc);
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size_scaler = get_interleaved_ue_golomb(&gc);
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/* pass the quantization matrices */
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get_interleaved_ue_golomb(&gc);
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for(lvl = 0; lvl < wavelet_depth; lvl++)
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{
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get_interleaved_ue_golomb(&gc);
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get_interleaved_ue_golomb(&gc);
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get_interleaved_ue_golomb(&gc);
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}
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frag_len = (get_bits_count(&gc) + 7) / 8; /* length of transform parameters */
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AV_WB32(&info_hdr[ 0], pic_nr);
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AV_WB16(&info_hdr[ 4], prefix_bytes);
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AV_WB16(&info_hdr[ 6], size_scaler);
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AV_WB16(&info_hdr[ 8], frag_len);
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AV_WB16(&info_hdr[10], 0 /* nr. of slices */);
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send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 12, buf, frag_len, interlaced, second_field, 0);
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buf += frag_len;
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size -= frag_len;
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while (size > 0) {
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frag_len = FFMIN(rtp_ctx->max_payload_size - 20 /* pl header */, size);
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AV_WB16(&info_hdr[ 8], frag_len);
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AV_WB16(&info_hdr[10], 1 /* nr. of slices */);
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AV_WB16(&info_hdr[12], 0 /* slice x */);
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AV_WB16(&info_hdr[14], 0 /* slice y */);
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size -= frag_len;
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send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 16, buf, frag_len, interlaced, second_field, size > 0 ? 0 : 1);
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buf += frag_len;
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}
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}
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void ff_rtp_send_vc2hq(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size, int interlaced)
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{
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const uint8_t *end = frame_buf + frame_size;
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const uint8_t *unit = frame_buf;
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uint8_t parse_code;
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uint32_t unit_size;
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while (unit < end) {
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parse_code = unit[4];
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unit_size = AV_RB32(&unit[5]);
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switch (parse_code) {
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/* sequence header */
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/* end of sequence */
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case DIRAC_PCODE_SEQ_HEADER:
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case DIRAC_PCODE_END_SEQ:
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send_packet(ctx, parse_code, 0, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, 0, 0, 0);
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break;
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/* HQ picture */
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case DIRAC_PCODE_PICTURE_HQ:
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send_picture(ctx, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, interlaced);
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break;
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/* parse codes without specification */
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case DIRAC_PCODE_AUX:
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case DIRAC_PCODE_PAD:
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break;
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default:
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avpriv_report_missing_feature(ctx, "VC-2 parse code %d", parse_code);
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break;
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}
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unit += unit_size;
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}
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}
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