| /* |
| * RTP parser 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 "avio_internal.h" |
| #include "rtpdec_formats.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 |
| |
| struct PayloadContext { |
| AVIOContext *buf; |
| uint32_t frame_size; |
| uint32_t frame_nr; |
| uint32_t timestamp; |
| uint32_t last_unit_size; |
| int seen_sequence_header; |
| }; |
| |
| static const uint8_t start_sequence[] = { 'B', 'B', 'C', 'D' }; |
| |
| static void fill_parse_info_header(PayloadContext *pl_ctx, uint8_t *buf, |
| uint8_t parse_code, uint32_t data_unit_size) |
| { |
| memcpy(buf, start_sequence, sizeof(start_sequence)); |
| buf[4] = parse_code; |
| AV_WB32(&buf[5], data_unit_size); |
| AV_WB32(&buf[9], pl_ctx->last_unit_size); |
| |
| pl_ctx->last_unit_size = data_unit_size; |
| } |
| |
| static int vc2hq_handle_sequence_header(PayloadContext *pl_ctx, AVStream *st, AVPacket *pkt, |
| const uint8_t *buf, int len) |
| { |
| int res; |
| uint32_t size = DIRAC_DATA_UNIT_HEADER_SIZE + len; |
| |
| if ((res = av_new_packet(pkt, DIRAC_DATA_UNIT_HEADER_SIZE + len)) < 0) |
| return res; |
| |
| fill_parse_info_header(pl_ctx, pkt->data, 0x00, size); |
| /* payload of seq. header */ |
| memcpy(pkt->data + DIRAC_DATA_UNIT_HEADER_SIZE, buf, len); |
| pkt->stream_index = st->index; |
| |
| pl_ctx->seen_sequence_header = 1; |
| |
| return 0; |
| } |
| |
| static int vc2hq_mark_end_of_sequence(PayloadContext *pl_ctx, AVStream *st, AVPacket *pkt) |
| { |
| int res; |
| uint32_t size = 0; |
| |
| /* create A/V packet */ |
| if ((res = av_new_packet(pkt, DIRAC_DATA_UNIT_HEADER_SIZE)) < 0) |
| return res; |
| |
| fill_parse_info_header(pl_ctx, pkt->data, 0x10, size); |
| pkt->stream_index = st->index; |
| |
| pl_ctx->seen_sequence_header = 0; |
| |
| return 0; |
| } |
| |
| static int vc2hq_handle_frame_fragment(AVFormatContext *ctx, PayloadContext *pl_ctx, AVStream *st, |
| AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, |
| int flags) |
| { |
| int res; |
| uint32_t pic_nr; |
| uint16_t frag_len; |
| uint16_t no_slices; |
| |
| /* sanity check for size of input packet: 16 bytes header in any case as minimum */ |
| if (len < 16) { |
| av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| pic_nr = AV_RB32(&buf[4]); |
| frag_len = AV_RB16(&buf[12]); |
| no_slices = AV_RB16(&buf[14]); |
| |
| if (pl_ctx->buf && pl_ctx->frame_nr != pic_nr) { |
| av_log(ctx, AV_LOG_WARNING, "Dropping buffered RTP/VC2hq packet fragments - non-continuous picture numbers\n"); |
| ffio_free_dyn_buf(&pl_ctx->buf); |
| } |
| |
| /* transform parameters? */ |
| if (no_slices == 0) { |
| if (len < frag_len + 16) { |
| av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* start frame buffering with new dynamic buffer */ |
| if (!pl_ctx->buf) { |
| |
| res = avio_open_dyn_buf(&pl_ctx->buf); |
| if (res < 0) |
| return res; |
| |
| /* reserve memory for frame header */ |
| res = avio_seek(pl_ctx->buf, DIRAC_DATA_UNIT_HEADER_SIZE + DIRAC_PIC_NR_SIZE, SEEK_SET); |
| if (res < 0) |
| return res; |
| |
| pl_ctx->frame_nr = pic_nr; |
| pl_ctx->timestamp = *timestamp; |
| pl_ctx->frame_size = DIRAC_DATA_UNIT_HEADER_SIZE + DIRAC_PIC_NR_SIZE; |
| } |
| |
| avio_write(pl_ctx->buf, buf + 16 /* skip pl header */, frag_len); |
| pl_ctx->frame_size += frag_len; |
| |
| return AVERROR(EAGAIN); |
| } else { |
| if (len < frag_len + 20) { |
| av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* transform parameters were missed, no buffer available */ |
| if (!pl_ctx->buf) |
| return AVERROR_INVALIDDATA; |
| |
| avio_write(pl_ctx->buf, buf + 20 /* skip pl header */, frag_len); |
| pl_ctx->frame_size += frag_len; |
| |
| /* RTP marker bit means: last fragment of current frame was received; |
| otherwise, an additional fragment is needed for the current frame */ |
| if (!(flags & RTP_FLAG_MARKER)) |
| return AVERROR(EAGAIN); |
| } |
| |
| /* close frame buffering and create A/V packet */ |
| res = ff_rtp_finalize_packet(pkt, &pl_ctx->buf, st->index); |
| if (res < 0) |
| return res; |
| |
| fill_parse_info_header(pl_ctx, pkt->data, DIRAC_PCODE_PICTURE_HQ, pl_ctx->frame_size); |
| AV_WB32(&pkt->data[13], pl_ctx->frame_nr); |
| |
| pl_ctx->frame_size = 0; |
| |
| return 0; |
| } |
| |
| static int vc2hq_handle_packet(AVFormatContext *ctx, PayloadContext *pl_ctx, |
| AVStream *st, AVPacket *pkt, uint32_t *timestamp, |
| const uint8_t *buf, int len, uint16_t seq, |
| int flags) |
| { |
| uint8_t parse_code = 0; |
| int res = 0; |
| |
| if (pl_ctx->buf && pl_ctx->timestamp != *timestamp) { |
| av_log(ctx, AV_LOG_WARNING, "Dropping buffered RTP/VC2hq packet fragments - non-continuous timestamps\n"); |
| ffio_free_dyn_buf(&pl_ctx->buf); |
| pl_ctx->frame_size = 0; |
| } |
| |
| /* sanity check for size of input packet: needed header data as minimum */ |
| if (len < RTP_VC2HQ_PL_HEADER_SIZE) { |
| av_log(ctx, AV_LOG_ERROR, "Too short RTP/VC2hq packet, got %d bytes\n", len); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| parse_code = buf[3]; |
| |
| /* wait for next sequence header? */ |
| if (pl_ctx->seen_sequence_header || parse_code == DIRAC_PCODE_SEQ_HEADER) { |
| switch(parse_code) { |
| /* sequence header */ |
| case DIRAC_PCODE_SEQ_HEADER: |
| res = vc2hq_handle_sequence_header(pl_ctx, st, pkt, buf + RTP_VC2HQ_PL_HEADER_SIZE, len - RTP_VC2HQ_PL_HEADER_SIZE); |
| break; |
| /* end of sequence */ |
| case DIRAC_PCODE_END_SEQ: |
| res = vc2hq_mark_end_of_sequence(pl_ctx, st, pkt); |
| break; |
| /* HQ picture fragment */ |
| case DIRAC_RTP_PCODE_HQ_PIC_FRAGMENT: |
| res = vc2hq_handle_frame_fragment(ctx, pl_ctx, st, pkt, timestamp, buf, len, flags); |
| break; |
| } |
| } |
| |
| return res; |
| } |
| |
| RTPDynamicProtocolHandler ff_vc2hq_dynamic_handler = { |
| .enc_name = "VC2", |
| .codec_type = AVMEDIA_TYPE_VIDEO, |
| .codec_id = AV_CODEC_ID_DIRAC, |
| .priv_data_size = sizeof(PayloadContext), |
| .parse_packet = vc2hq_handle_packet |
| }; |