mirror of https://git.ffmpeg.org/ffmpeg.git
125 lines
4.1 KiB
C
125 lines
4.1 KiB
C
/*
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* Avid DNxUncomressed / SMPTE RDD 50 parser
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* Copyright (c) 2024 Martin Schitter
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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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/*
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This parser for DNxUncompressed video data is mostly based on
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reverse engineering of output generated by DaVinci Resolve 19
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but was later also checked against the SMPTE RDD 50 specification.
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Limitations: Multiple image planes are not supported.
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*/
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#include "avcodec.h"
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#include "libavutil/intreadwrite.h"
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typedef struct DNxUcParseContext {
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uint32_t fourcc_tag;
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uint32_t width;
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uint32_t height;
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uint32_t nr_bytes;
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} DNxUcParseContext;
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/*
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DNxUncompressed frame data comes wrapped in nested boxes of metadata
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(box structure: len + fourcc marker + data):
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[0-4] len of outer essence unit box (typically 37 bytes of header + frame data)
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[4-7] fourcc 'pack'
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[8-11] len of "signal info box" (always 21)
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[12-15] fourcc 'sinf'
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[16-19] frame width / line packing size
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[20-23] frame hight / nr of lines
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[24-27] fourcc pixel format indicator
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[28] frame_layout (0: progressive, 1: interlaced)
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[29-32] len of "signal data box" (nr of frame data bytes + 8)
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[33-36] fourcc 'sdat'
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[37-..] frame data
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A sequence of 'signal info'+'signal data' box pairs wrapped in
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'icmp'(=image component) boxes can be utilized to compose more
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complex multi plane images.
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This feature is only partially supported in the present implementation.
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We never pick more than the first pair of info and image data enclosed
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in this way.
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*/
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static int dnxuc_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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char fourcc_buf[5];
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const int HEADER_SIZE = 37;
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int icmp_offset = 0;
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DNxUcParseContext *pc;
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pc = (DNxUcParseContext *) s->priv_data;
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if (!buf_size) {
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return 0;
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}
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if (buf_size > 16 && MKTAG('i','c','m','p') == AV_RL32(buf+12)){
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icmp_offset += 8;
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}
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if ( buf_size < 37 + icmp_offset /* check metadata structure expectations */
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|| MKTAG('p','a','c','k') != AV_RL32(buf+4+icmp_offset)
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|| MKTAG('s','i','n','f') != AV_RL32(buf+12+icmp_offset)
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|| MKTAG('s','d','a','t') != AV_RL32(buf+33+icmp_offset)){
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av_log(avctx, AV_LOG_ERROR, "can't read DNxUncompressed metadata.\n");
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*poutbuf_size = 0;
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return buf_size;
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}
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pc->fourcc_tag = AV_RL32(buf+24+icmp_offset);
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pc->width = AV_RL32(buf+16+icmp_offset);
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pc->height = AV_RL32(buf+20+icmp_offset);
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pc->nr_bytes = AV_RL32(buf+29+icmp_offset) - 8;
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if (!avctx->codec_tag) {
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av_fourcc_make_string(fourcc_buf, pc->fourcc_tag);
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av_log(avctx, AV_LOG_INFO, "dnxuc_parser: '%s' %dx%d %dbpp %d\n",
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fourcc_buf,
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pc->width, pc->height,
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(pc->nr_bytes*8)/(pc->width*pc->height),
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pc->nr_bytes);
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avctx->codec_tag = pc->fourcc_tag;
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}
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if (pc->nr_bytes > buf_size - HEADER_SIZE + icmp_offset){
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av_log(avctx, AV_LOG_ERROR, "Insufficient size of image essence data.\n");
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*poutbuf_size = 0;
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return buf_size;
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}
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*poutbuf = buf + HEADER_SIZE + icmp_offset;
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*poutbuf_size = pc->nr_bytes;
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return buf_size;
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}
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const AVCodecParser ff_dnxuc_parser = {
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.codec_ids = { AV_CODEC_ID_DNXUC },
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.priv_data_size = sizeof(DNxUcParseContext),
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.parser_parse = dnxuc_parse,
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};
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