mirror of https://github.com/FFmpeg/FFmpeg.git
Thomas Volkert
9 years ago
parent
1ef267b83f
commit
f591b7b526
8 changed files with 157 additions and 2 deletions
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/*
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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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svq3_get_ue_golomb(&gc); /* wavelet_idx */ |
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wavelet_depth = svq3_get_ue_golomb(&gc); |
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svq3_get_ue_golomb(&gc); /* num_x */ |
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svq3_get_ue_golomb(&gc); /* num_y */ |
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prefix_bytes = svq3_get_ue_golomb(&gc); |
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size_scaler = svq3_get_ue_golomb(&gc); |
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/* pass the quantization matrices */ |
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svq3_get_ue_golomb(&gc); |
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for(lvl = 0; lvl < wavelet_depth; lvl++) |
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{ |
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svq3_get_ue_golomb(&gc); |
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svq3_get_ue_golomb(&gc); |
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svq3_get_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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