mirror of https://git.ffmpeg.org/ffmpeg.git
147 lines
4.9 KiB
C
147 lines
4.9 KiB
C
/*
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* SER demuxer
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* Copyright (c) 2018 Paul B Mahol
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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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#include "libavutil/imgutils.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.h"
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#include "internal.h"
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#include "avformat.h"
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#define SER_MAGIC "LUCAM-RECORDER"
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typedef struct SERDemuxerContext {
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const AVClass *class;
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int width, height;
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AVRational framerate;
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int64_t end;
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} SERDemuxerContext;
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static int ser_probe(const AVProbeData *pd)
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{
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if (memcmp(pd->buf, SER_MAGIC, 14) == 0)
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int ser_read_header(AVFormatContext *s)
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{
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SERDemuxerContext *ser = s->priv_data;
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enum AVPixelFormat pix_fmt;
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int depth, color_id, endian;
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int packet_size;
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AVStream *st;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(s->pb, 14);
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avio_skip(s->pb, 4);
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color_id = avio_rl32(s->pb);
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endian = avio_rl32(s->pb);
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ser->width = avio_rl32(s->pb);
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ser->height = avio_rl32(s->pb);
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depth = avio_rl32(s->pb);
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st->nb_frames = st->duration = avio_rl32(s->pb);
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avio_skip(s->pb, 120);
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avio_skip(s->pb, 8);
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avio_skip(s->pb, 8);
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switch (color_id) {
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case 0: pix_fmt = depth <= 8 ? AV_PIX_FMT_GRAY8 : endian ? AV_PIX_FMT_GRAY16BE : AV_PIX_FMT_GRAY16LE; break;
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case 8: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_RGGB8 : endian ? AV_PIX_FMT_BAYER_RGGB16BE : AV_PIX_FMT_BAYER_RGGB16LE; break;
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case 9: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_GRBG8 : endian ? AV_PIX_FMT_BAYER_GRBG16BE : AV_PIX_FMT_BAYER_GRBG16LE; break;
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case 10: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_GBRG8 : endian ? AV_PIX_FMT_BAYER_GBRG16BE : AV_PIX_FMT_BAYER_GBRG16LE; break;
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case 11: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_BGGR8 : endian ? AV_PIX_FMT_BAYER_BGGR16BE : AV_PIX_FMT_BAYER_BGGR16LE; break;
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case 100: pix_fmt = depth <= 8 ? AV_PIX_FMT_RGB24 : endian ? AV_PIX_FMT_RGB48BE : AV_PIX_FMT_RGB48LE; break;
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case 101: pix_fmt = depth <= 8 ? AV_PIX_FMT_BGR24 : endian ? AV_PIX_FMT_BGR48BE : AV_PIX_FMT_BGR48LE; break;
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default:
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return AVERROR_PATCHWELCOME;
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}
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
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avpriv_set_pts_info(st, 64, ser->framerate.den, ser->framerate.num);
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st->codecpar->width = ser->width;
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st->codecpar->height = ser->height;
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st->codecpar->format = pix_fmt;
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packet_size = av_image_get_buffer_size(st->codecpar->format, ser->width, ser->height, 1);
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if (packet_size < 0)
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return packet_size;
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ser->end = 178 + st->nb_frames * packet_size;
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s->packet_size = packet_size;
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st->codecpar->bit_rate = av_rescale_q(s->packet_size,
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(AVRational){8,1}, st->time_base);
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return 0;
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}
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static int ser_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SERDemuxerContext *ser = s->priv_data;
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int64_t pos;
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int ret;
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pos = avio_tell(s->pb);
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if (pos >= ser->end)
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return AVERROR_EOF;
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ret = av_get_packet(s->pb, pkt, s->packet_size);
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pkt->pts = pkt->dts = (pkt->pos - ffformatcontext(s)->data_offset) / s->packet_size;
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pkt->stream_index = 0;
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if (ret < 0)
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return ret;
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return 0;
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}
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#define OFFSET(x) offsetof(SERDemuxerContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static const AVOption ser_options[] = {
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{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
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{ NULL },
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};
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static const AVClass ser_demuxer_class = {
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.class_name = "ser demuxer",
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.item_name = av_default_item_name,
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.option = ser_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const AVInputFormat ff_ser_demuxer = {
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.name = "ser",
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.long_name = NULL_IF_CONFIG_SMALL("SER (Simple uncompressed video format for astronomical capturing)"),
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.priv_data_size = sizeof(SERDemuxerContext),
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.read_probe = ser_probe,
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.read_header = ser_read_header,
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.read_packet = ser_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "ser",
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.raw_codec_id = AV_CODEC_ID_RAWVIDEO,
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.priv_class = &ser_demuxer_class,
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};
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