1/* 2 * SER demuxer 3 * Copyright (c) 2018 Paul B Mahol 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/imgutils.h" 23#include "libavutil/parseutils.h" 24#include "libavutil/pixdesc.h" 25#include "libavutil/opt.h" 26#include "internal.h" 27#include "avformat.h" 28 29#define SER_MAGIC "LUCAM-RECORDER" 30 31typedef struct SERDemuxerContext { 32 const AVClass *class; 33 int width, height; 34 AVRational framerate; 35 int64_t end; 36} SERDemuxerContext; 37 38static int ser_probe(const AVProbeData *pd) 39{ 40 if (memcmp(pd->buf, SER_MAGIC, 14) == 0) 41 return AVPROBE_SCORE_MAX; 42 else 43 return 0; 44} 45 46static int ser_read_header(AVFormatContext *s) 47{ 48 SERDemuxerContext *ser = s->priv_data; 49 enum AVPixelFormat pix_fmt; 50 int depth, color_id, endian; 51 int packet_size; 52 AVStream *st; 53 54 st = avformat_new_stream(s, NULL); 55 if (!st) 56 return AVERROR(ENOMEM); 57 58 avio_skip(s->pb, 14); 59 avio_skip(s->pb, 4); 60 color_id = avio_rl32(s->pb); 61 endian = avio_rl32(s->pb); 62 ser->width = avio_rl32(s->pb); 63 ser->height = avio_rl32(s->pb); 64 depth = avio_rl32(s->pb); 65 st->nb_frames = st->duration = avio_rl32(s->pb); 66 avio_skip(s->pb, 120); 67 avio_skip(s->pb, 8); 68 avio_skip(s->pb, 8); 69 70 switch (color_id) { 71 case 0: pix_fmt = depth <= 8 ? AV_PIX_FMT_GRAY8 : endian ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE; break; 72 case 8: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_RGGB8 : endian ? AV_PIX_FMT_BAYER_RGGB16LE : AV_PIX_FMT_BAYER_RGGB16BE; break; 73 case 9: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_GRBG8 : endian ? AV_PIX_FMT_BAYER_GRBG16LE : AV_PIX_FMT_BAYER_GRBG16BE; break; 74 case 10: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_GBRG8 : endian ? AV_PIX_FMT_BAYER_GBRG16LE : AV_PIX_FMT_BAYER_GBRG16BE; break; 75 case 11: pix_fmt = depth <= 8 ? AV_PIX_FMT_BAYER_BGGR8 : endian ? AV_PIX_FMT_BAYER_BGGR16LE : AV_PIX_FMT_BAYER_BGGR16BE; break; 76 case 100: pix_fmt = depth <= 8 ? AV_PIX_FMT_RGB24 : endian ? AV_PIX_FMT_RGB48LE : AV_PIX_FMT_RGB48BE; break; 77 case 101: pix_fmt = depth <= 8 ? AV_PIX_FMT_BGR24 : endian ? AV_PIX_FMT_BGR48LE : AV_PIX_FMT_BGR48BE; break; 78 default: 79 return AVERROR_PATCHWELCOME; 80 } 81 82 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; 83 st->codecpar->codec_id = s->iformat->raw_codec_id; 84 85 avpriv_set_pts_info(st, 64, ser->framerate.den, ser->framerate.num); 86 87 st->codecpar->width = ser->width; 88 st->codecpar->height = ser->height; 89 st->codecpar->format = pix_fmt; 90 packet_size = av_image_get_buffer_size(st->codecpar->format, ser->width, ser->height, 1); 91 if (packet_size < 0) 92 return packet_size; 93 ser->end = 178 + st->nb_frames * packet_size; 94 s->packet_size = packet_size; 95 st->codecpar->bit_rate = av_rescale_q(s->packet_size, 96 (AVRational){8,1}, st->time_base); 97 98 return 0; 99} 100 101 102static int ser_read_packet(AVFormatContext *s, AVPacket *pkt) 103{ 104 SERDemuxerContext *ser = s->priv_data; 105 int64_t pos; 106 int ret; 107 108 pos = avio_tell(s->pb); 109 if (pos >= ser->end) 110 return AVERROR_EOF; 111 112 ret = av_get_packet(s->pb, pkt, s->packet_size); 113 pkt->pts = pkt->dts = (pkt->pos - ffformatcontext(s)->data_offset) / s->packet_size; 114 115 pkt->stream_index = 0; 116 if (ret < 0) 117 return ret; 118 return 0; 119} 120 121#define OFFSET(x) offsetof(SERDemuxerContext, x) 122#define DEC AV_OPT_FLAG_DECODING_PARAM 123static const AVOption ser_options[] = { 124 { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC }, 125 { NULL }, 126}; 127 128static const AVClass ser_demuxer_class = { 129 .class_name = "ser demuxer", 130 .item_name = av_default_item_name, 131 .option = ser_options, 132 .version = LIBAVUTIL_VERSION_INT, 133}; 134 135const AVInputFormat ff_ser_demuxer = { 136 .name = "ser", 137 .long_name = NULL_IF_CONFIG_SMALL("SER (Simple uncompressed video format for astronomical capturing)"), 138 .priv_data_size = sizeof(SERDemuxerContext), 139 .read_probe = ser_probe, 140 .read_header = ser_read_header, 141 .read_packet = ser_read_packet, 142 .flags = AVFMT_GENERIC_INDEX, 143 .extensions = "ser", 144 .raw_codec_id = AV_CODEC_ID_RAWVIDEO, 145 .priv_class = &ser_demuxer_class, 146}; 147