diff options
Diffstat (limited to 'libavformat/rtpdec_vc2hq.c')
-rw-r--r-- | libavformat/rtpdec_vc2hq.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/libavformat/rtpdec_vc2hq.c b/libavformat/rtpdec_vc2hq.c new file mode 100644 index 0000000000..8a3996a035 --- /dev/null +++ b/libavformat/rtpdec_vc2hq.c @@ -0,0 +1,225 @@ +/* + * 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 +}; |