| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP packetizer for VC-2 HQ payload format (draft version 1) - experimental | ||
| 3 | * Copyright (c) 2016 Thomas Volkert <thomas@netzeal.de> | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" | ||
| 23 | #include "libavcodec/dirac.h" | ||
| 24 | #include "libavcodec/get_bits.h" | ||
| 25 | #include "libavcodec/golomb.h" | ||
| 26 | |||
| 27 | #include "avformat.h" | ||
| 28 | #include "rtpenc.h" | ||
| 29 | |||
| 30 | #define RTP_VC2HQ_PL_HEADER_SIZE 4 | ||
| 31 | |||
| 32 | #define DIRAC_DATA_UNIT_HEADER_SIZE 13 | ||
| 33 | #define DIRAC_PIC_NR_SIZE 4 | ||
| 34 | #define DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT 0xEC | ||
| 35 | |||
| 36 | ✗ | static int 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) | |
| 37 | { | ||
| 38 | ✗ | RTPMuxContext *rtp_ctx = ctx->priv_data; | |
| 39 | |||
| 40 | ✗ | if (size < 0 || | |
| 41 | ✗ | size > rtp_ctx->max_payload_size - RTP_VC2HQ_PL_HEADER_SIZE - info_hdr_size) { | |
| 42 | ✗ | av_log(ctx, AV_LOG_ERROR, "VC-2 data unit too large for RTP payload buffer\n"); | |
| 43 | ✗ | return AVERROR_INVALIDDATA; | |
| 44 | } | ||
| 45 | |||
| 46 | ✗ | AV_WB16(&rtp_ctx->buf[0], rtp_ctx->seq_high); /* extended sequence number */ | |
| 47 | ✗ | AV_WB8 (&rtp_ctx->buf[2], i ? (f ? (0x03) : (0x02)) : 0x00); /* flags: interlaced, second field */ | |
| 48 | ✗ | AV_WB8 (&rtp_ctx->buf[3], parse_code); | |
| 49 | ✗ | if (size > 0) | |
| 50 | ✗ | memcpy(&rtp_ctx->buf[4 + info_hdr_size], buf, size); | |
| 51 | ✗ | ff_rtp_send_data(ctx, rtp_ctx->buf, RTP_VC2HQ_PL_HEADER_SIZE + info_hdr_size + size, rtp_m); | |
| 52 | ✗ | return 0; | |
| 53 | } | ||
| 54 | |||
| 55 | ✗ | static int send_picture(AVFormatContext *ctx, const uint8_t *buf, int size, int interlaced) | |
| 56 | { | ||
| 57 | ✗ | RTPMuxContext *rtp_ctx = ctx->priv_data; | |
| 58 | GetBitContext gc; | ||
| 59 | int lvl, second_field; | ||
| 60 | uint32_t pic_nr, wavelet_depth, prefix_bytes, size_scaler; | ||
| 61 | int frag_len; | ||
| 62 | ✗ | char *info_hdr = &rtp_ctx->buf[4]; | |
| 63 | |||
| 64 | ✗ | if (size < DIRAC_PIC_NR_SIZE) | |
| 65 | ✗ | return AVERROR(EINVAL); | |
| 66 | |||
| 67 | ✗ | pic_nr = AV_RB32(&buf[0]); | |
| 68 | ✗ | buf += DIRAC_PIC_NR_SIZE; | |
| 69 | ✗ | size -= DIRAC_PIC_NR_SIZE; | |
| 70 | ✗ | second_field = interlaced && (pic_nr & 0x01); | |
| 71 | |||
| 72 | ✗ | init_get_bits8(&gc, buf, FFMIN(size, UINT16_MAX)); | |
| 73 | ✗ | get_interleaved_ue_golomb(&gc); /* wavelet_idx */ | |
| 74 | ✗ | wavelet_depth = get_interleaved_ue_golomb(&gc); | |
| 75 | ✗ | get_interleaved_ue_golomb(&gc); /* num_x */ | |
| 76 | ✗ | get_interleaved_ue_golomb(&gc); /* num_y */ | |
| 77 | ✗ | prefix_bytes = get_interleaved_ue_golomb(&gc); | |
| 78 | ✗ | size_scaler = get_interleaved_ue_golomb(&gc); | |
| 79 | ✗ | if (prefix_bytes > UINT16_MAX || size_scaler > UINT16_MAX) | |
| 80 | ✗ | return AVERROR_INVALIDDATA; | |
| 81 | /* pass the quantization matrices */ | ||
| 82 | ✗ | if (get_bits1(&gc)) { | |
| 83 | ✗ | get_interleaved_ue_golomb(&gc); | |
| 84 | ✗ | for(lvl = 0; lvl < wavelet_depth; lvl++) | |
| 85 | { | ||
| 86 | ✗ | if (get_bits_left(&gc) < 0) | |
| 87 | ✗ | return AVERROR_INVALIDDATA; | |
| 88 | ✗ | get_interleaved_ue_golomb(&gc); | |
| 89 | ✗ | get_interleaved_ue_golomb(&gc); | |
| 90 | ✗ | get_interleaved_ue_golomb(&gc); | |
| 91 | } | ||
| 92 | } | ||
| 93 | |||
| 94 | ✗ | frag_len = (get_bits_count(&gc) + 7) / 8; /* length of transform parameters */ | |
| 95 | ✗ | if (get_bits_left(&gc) < 0 || frag_len > UINT16_MAX) | |
| 96 | ✗ | return AVERROR_INVALIDDATA; | |
| 97 | |||
| 98 | ✗ | AV_WB32(&info_hdr[ 0], pic_nr); | |
| 99 | ✗ | AV_WB16(&info_hdr[ 4], prefix_bytes); | |
| 100 | ✗ | AV_WB16(&info_hdr[ 6], size_scaler); | |
| 101 | ✗ | AV_WB16(&info_hdr[ 8], frag_len); | |
| 102 | ✗ | AV_WB16(&info_hdr[10], 0 /* nr. of slices */); | |
| 103 | ✗ | if (send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 12, buf, frag_len, interlaced, second_field, 0) < 0) | |
| 104 | ✗ | return AVERROR_INVALIDDATA; | |
| 105 | ✗ | buf += frag_len; | |
| 106 | ✗ | size -= frag_len; | |
| 107 | |||
| 108 | ✗ | while (size > 0) { | |
| 109 | ✗ | frag_len = FFMIN3(rtp_ctx->max_payload_size - 20 /* pl header */, size, UINT16_MAX); | |
| 110 | ✗ | AV_WB16(&info_hdr[ 8], frag_len); | |
| 111 | ✗ | AV_WB16(&info_hdr[10], 1 /* nr. of slices */); | |
| 112 | ✗ | AV_WB16(&info_hdr[12], 0 /* slice x */); | |
| 113 | ✗ | AV_WB16(&info_hdr[14], 0 /* slice y */); | |
| 114 | |||
| 115 | ✗ | size -= frag_len; | |
| 116 | ✗ | if (send_packet(ctx, DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT, 16, buf, frag_len, interlaced, second_field, size > 0 ? 0 : 1) < 0) | |
| 117 | ✗ | return AVERROR_INVALIDDATA; | |
| 118 | ✗ | buf += frag_len; | |
| 119 | } | ||
| 120 | ✗ | return 0; | |
| 121 | } | ||
| 122 | |||
| 123 | ✗ | void ff_rtp_send_vc2hq(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size, int interlaced) | |
| 124 | { | ||
| 125 | ✗ | const uint8_t *end = frame_buf + frame_size; | |
| 126 | ✗ | const uint8_t *unit = frame_buf; | |
| 127 | uint8_t parse_code; | ||
| 128 | uint32_t unit_size; | ||
| 129 | |||
| 130 | ✗ | while (end - unit >= DIRAC_DATA_UNIT_HEADER_SIZE) { | |
| 131 | ✗ | parse_code = unit[4]; | |
| 132 | ✗ | unit_size = AV_RB32(&unit[5]); | |
| 133 | ✗ | if (!unit_size) | |
| 134 | ✗ | unit_size = end - unit; | |
| 135 | |||
| 136 | ✗ | if (unit_size < DIRAC_DATA_UNIT_HEADER_SIZE || unit_size > end - unit) | |
| 137 | break; | ||
| 138 | |||
| 139 | ✗ | switch (parse_code) { | |
| 140 | /* sequence header */ | ||
| 141 | /* end of sequence */ | ||
| 142 | ✗ | case DIRAC_PCODE_SEQ_HEADER: | |
| 143 | case DIRAC_PCODE_END_SEQ: | ||
| 144 | ✗ | send_packet(ctx, parse_code, 0, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, 0, 0, 0); | |
| 145 | ✗ | break; | |
| 146 | /* HQ picture */ | ||
| 147 | ✗ | case DIRAC_PCODE_PICTURE_HQ: | |
| 148 | ✗ | send_picture(ctx, unit + DIRAC_DATA_UNIT_HEADER_SIZE, unit_size - DIRAC_DATA_UNIT_HEADER_SIZE, interlaced); | |
| 149 | ✗ | break; | |
| 150 | /* parse codes without specification */ | ||
| 151 | ✗ | case DIRAC_PCODE_AUX: | |
| 152 | case DIRAC_PCODE_PAD: | ||
| 153 | ✗ | break; | |
| 154 | ✗ | default: | |
| 155 | ✗ | avpriv_report_missing_feature(ctx, "VC-2 parse code %d", parse_code); | |
| 156 | ✗ | break; | |
| 157 | } | ||
| 158 | ✗ | unit += unit_size; | |
| 159 | } | ||
| 160 | ✗ | } | |
| 161 |