| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP parser 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 | |||
| 25 | #include "avio_internal.h" | ||
| 26 | #include "rtpdec_formats.h" | ||
| 27 | |||
| 28 | #define RTP_VC2HQ_PL_HEADER_SIZE 4 | ||
| 29 | |||
| 30 | #define DIRAC_DATA_UNIT_HEADER_SIZE 13 | ||
| 31 | #define DIRAC_PIC_NR_SIZE 4 | ||
| 32 | #define DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT 0xEC | ||
| 33 | |||
| 34 | struct PayloadContext { | ||
| 35 | AVIOContext *buf; | ||
| 36 | uint32_t frame_size; | ||
| 37 | uint32_t frame_nr; | ||
| 38 | uint32_t timestamp; | ||
| 39 | uint32_t last_unit_size; | ||
| 40 | int seen_sequence_header; | ||
| 41 | }; | ||
| 42 | |||
| 43 | static const uint8_t start_sequence[] = { 'B', 'B', 'C', 'D' }; | ||
| 44 | |||
| 45 | ✗ | static void fill_parse_info_header(PayloadContext *pl_ctx, uint8_t *buf, | |
| 46 | uint8_t parse_code, uint32_t data_unit_size) | ||
| 47 | { | ||
| 48 | ✗ | memcpy(buf, start_sequence, sizeof(start_sequence)); | |
| 49 | ✗ | buf[4] = parse_code; | |
| 50 | ✗ | AV_WB32(&buf[5], data_unit_size); | |
| 51 | ✗ | AV_WB32(&buf[9], pl_ctx->last_unit_size); | |
| 52 | |||
| 53 | ✗ | pl_ctx->last_unit_size = data_unit_size; | |
| 54 | ✗ | } | |
| 55 | |||
| 56 | ✗ | static int vc2hq_handle_sequence_header(PayloadContext *pl_ctx, AVStream *st, AVPacket *pkt, | |
| 57 | const uint8_t *buf, int len) | ||
| 58 | { | ||
| 59 | int res; | ||
| 60 | ✗ | uint32_t size = DIRAC_DATA_UNIT_HEADER_SIZE + len; | |
| 61 | |||
| 62 | ✗ | if ((res = av_new_packet(pkt, DIRAC_DATA_UNIT_HEADER_SIZE + len)) < 0) | |
| 63 | ✗ | return res; | |
| 64 | |||
| 65 | ✗ | fill_parse_info_header(pl_ctx, pkt->data, 0x00, size); | |
| 66 | /* payload of seq. header */ | ||
| 67 | ✗ | memcpy(pkt->data + DIRAC_DATA_UNIT_HEADER_SIZE, buf, len); | |
| 68 | ✗ | pkt->stream_index = st->index; | |
| 69 | |||
| 70 | ✗ | pl_ctx->seen_sequence_header = 1; | |
| 71 | |||
| 72 | ✗ | return 0; | |
| 73 | } | ||
| 74 | |||
| 75 | ✗ | static int vc2hq_mark_end_of_sequence(PayloadContext *pl_ctx, AVStream *st, AVPacket *pkt) | |
| 76 | { | ||
| 77 | int res; | ||
| 78 | ✗ | uint32_t size = 0; | |
| 79 | |||
| 80 | /* create A/V packet */ | ||
| 81 | ✗ | if ((res = av_new_packet(pkt, DIRAC_DATA_UNIT_HEADER_SIZE)) < 0) | |
| 82 | ✗ | return res; | |
| 83 | |||
| 84 | ✗ | fill_parse_info_header(pl_ctx, pkt->data, 0x10, size); | |
| 85 | ✗ | pkt->stream_index = st->index; | |
| 86 | |||
| 87 | ✗ | pl_ctx->seen_sequence_header = 0; | |
| 88 | |||
| 89 | ✗ | return 0; | |
| 90 | } | ||
| 91 | |||
| 92 | ✗ | static int vc2hq_handle_frame_fragment(AVFormatContext *ctx, PayloadContext *pl_ctx, AVStream *st, | |
| 93 | AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, | ||
| 94 | int flags) | ||
| 95 | { | ||
| 96 | int res; | ||
| 97 | uint32_t pic_nr; | ||
| 98 | uint16_t frag_len; | ||
| 99 | uint16_t no_slices; | ||
| 100 | |||
| 101 | /* sanity check for size of input packet: 16 bytes header in any case as minimum */ | ||
| 102 | ✗ | if (len < 16) { | |
| 103 | ✗ | av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); | |
| 104 | ✗ | return AVERROR_INVALIDDATA; | |
| 105 | } | ||
| 106 | |||
| 107 | ✗ | pic_nr = AV_RB32(&buf[4]); | |
| 108 | ✗ | frag_len = AV_RB16(&buf[12]); | |
| 109 | ✗ | no_slices = AV_RB16(&buf[14]); | |
| 110 | |||
| 111 | ✗ | if (pl_ctx->buf && pl_ctx->frame_nr != pic_nr) { | |
| 112 | ✗ | av_log(ctx, AV_LOG_WARNING, "Dropping buffered RTP/VC2hq packet fragments - non-continuous picture numbers\n"); | |
| 113 | ✗ | ffio_free_dyn_buf(&pl_ctx->buf); | |
| 114 | } | ||
| 115 | |||
| 116 | /* transform parameters? */ | ||
| 117 | ✗ | if (no_slices == 0) { | |
| 118 | ✗ | if (len < frag_len + 16) { | |
| 119 | ✗ | av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); | |
| 120 | ✗ | return AVERROR_INVALIDDATA; | |
| 121 | } | ||
| 122 | |||
| 123 | /* start frame buffering with new dynamic buffer */ | ||
| 124 | ✗ | if (!pl_ctx->buf) { | |
| 125 | |||
| 126 | ✗ | res = avio_open_dyn_buf(&pl_ctx->buf); | |
| 127 | ✗ | if (res < 0) | |
| 128 | ✗ | return res; | |
| 129 | |||
| 130 | /* reserve memory for frame header */ | ||
| 131 | ✗ | res = avio_seek(pl_ctx->buf, DIRAC_DATA_UNIT_HEADER_SIZE + DIRAC_PIC_NR_SIZE, SEEK_SET); | |
| 132 | ✗ | if (res < 0) | |
| 133 | ✗ | return res; | |
| 134 | |||
| 135 | ✗ | pl_ctx->frame_nr = pic_nr; | |
| 136 | ✗ | pl_ctx->timestamp = *timestamp; | |
| 137 | ✗ | pl_ctx->frame_size = DIRAC_DATA_UNIT_HEADER_SIZE + DIRAC_PIC_NR_SIZE; | |
| 138 | } | ||
| 139 | |||
| 140 | ✗ | avio_write(pl_ctx->buf, buf + 16 /* skip pl header */, frag_len); | |
| 141 | ✗ | pl_ctx->frame_size += frag_len; | |
| 142 | |||
| 143 | ✗ | return AVERROR(EAGAIN); | |
| 144 | } else { | ||
| 145 | ✗ | if (len < frag_len + 20) { | |
| 146 | ✗ | av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); | |
| 147 | ✗ | return AVERROR_INVALIDDATA; | |
| 148 | } | ||
| 149 | |||
| 150 | /* transform parameters were missed, no buffer available */ | ||
| 151 | ✗ | if (!pl_ctx->buf) | |
| 152 | ✗ | return AVERROR_INVALIDDATA; | |
| 153 | |||
| 154 | ✗ | avio_write(pl_ctx->buf, buf + 20 /* skip pl header */, frag_len); | |
| 155 | ✗ | pl_ctx->frame_size += frag_len; | |
| 156 | |||
| 157 | /* RTP marker bit means: last fragment of current frame was received; | ||
| 158 | otherwise, an additional fragment is needed for the current frame */ | ||
| 159 | ✗ | if (!(flags & RTP_FLAG_MARKER)) | |
| 160 | ✗ | return AVERROR(EAGAIN); | |
| 161 | } | ||
| 162 | |||
| 163 | /* close frame buffering and create A/V packet */ | ||
| 164 | ✗ | res = ff_rtp_finalize_packet(pkt, &pl_ctx->buf, st->index); | |
| 165 | ✗ | if (res < 0) | |
| 166 | ✗ | return res; | |
| 167 | |||
| 168 | ✗ | fill_parse_info_header(pl_ctx, pkt->data, DIRAC_PCODE_PICTURE_HQ, pl_ctx->frame_size); | |
| 169 | ✗ | AV_WB32(&pkt->data[13], pl_ctx->frame_nr); | |
| 170 | |||
| 171 | ✗ | pl_ctx->frame_size = 0; | |
| 172 | |||
| 173 | ✗ | return 0; | |
| 174 | } | ||
| 175 | |||
| 176 | ✗ | static int vc2hq_handle_packet(AVFormatContext *ctx, PayloadContext *pl_ctx, | |
| 177 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | ||
| 178 | const uint8_t *buf, int len, uint16_t seq, | ||
| 179 | int flags) | ||
| 180 | { | ||
| 181 | ✗ | uint8_t parse_code = 0; | |
| 182 | ✗ | int res = 0; | |
| 183 | |||
| 184 | ✗ | if (pl_ctx->buf && pl_ctx->timestamp != *timestamp) { | |
| 185 | ✗ | av_log(ctx, AV_LOG_WARNING, "Dropping buffered RTP/VC2hq packet fragments - non-continuous timestamps\n"); | |
| 186 | ✗ | ffio_free_dyn_buf(&pl_ctx->buf); | |
| 187 | ✗ | pl_ctx->frame_size = 0; | |
| 188 | } | ||
| 189 | |||
| 190 | /* sanity check for size of input packet: needed header data as minimum */ | ||
| 191 | ✗ | if (len < RTP_VC2HQ_PL_HEADER_SIZE) { | |
| 192 | ✗ | av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); | |
| 193 | ✗ | return AVERROR_INVALIDDATA; | |
| 194 | } | ||
| 195 | |||
| 196 | ✗ | parse_code = buf[3]; | |
| 197 | |||
| 198 | /* wait for next sequence header? */ | ||
| 199 | ✗ | if (pl_ctx->seen_sequence_header || parse_code == DIRAC_PCODE_SEQ_HEADER) { | |
| 200 | ✗ | switch(parse_code) { | |
| 201 | /* sequence header */ | ||
| 202 | ✗ | case DIRAC_PCODE_SEQ_HEADER: | |
| 203 | ✗ | res = vc2hq_handle_sequence_header(pl_ctx, st, pkt, buf + RTP_VC2HQ_PL_HEADER_SIZE, len - RTP_VC2HQ_PL_HEADER_SIZE); | |
| 204 | ✗ | break; | |
| 205 | /* end of sequence */ | ||
| 206 | ✗ | case DIRAC_PCODE_END_SEQ: | |
| 207 | ✗ | res = vc2hq_mark_end_of_sequence(pl_ctx, st, pkt); | |
| 208 | ✗ | break; | |
| 209 | /* HQ picture fragment */ | ||
| 210 | ✗ | case DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT: | |
| 211 | ✗ | res = vc2hq_handle_frame_fragment(ctx, pl_ctx, st, pkt, timestamp, buf, len, flags); | |
| 212 | ✗ | break; | |
| 213 | } | ||
| 214 | } | ||
| 215 | |||
| 216 | ✗ | return res; | |
| 217 | } | ||
| 218 | |||
| 219 | const RTPDynamicProtocolHandler ff_vc2hq_dynamic_handler = { | ||
| 220 | .enc_name = "VC2", | ||
| 221 | .codec_type = AVMEDIA_TYPE_VIDEO, | ||
| 222 | .codec_id = AV_CODEC_ID_DIRAC, | ||
| 223 | .priv_data_size = sizeof(PayloadContext), | ||
| 224 | .parse_packet = vc2hq_handle_packet | ||
| 225 | }; | ||
| 226 |