blob: 2f6b7264279081859603b6ee3a59a324240e32d4
| 1 | /* |
| 2 | * Megalux Frame demuxer |
| 3 | * Copyright (c) 2010 Peter Ross <pross@xvid.org> |
| 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 | /** |
| 23 | * @file |
| 24 | * Megalux Frame demuxer |
| 25 | */ |
| 26 | |
| 27 | #include "libavcodec/raw.h" |
| 28 | #include "libavutil/imgutils.h" |
| 29 | #include "libavutil/intreadwrite.h" |
| 30 | #include "avformat.h" |
| 31 | |
| 32 | static const PixelFormatTag frm_pix_fmt_tags[] = { |
| 33 | { AV_PIX_FMT_RGB555, 1 }, |
| 34 | { AV_PIX_FMT_RGB0, 2 }, |
| 35 | { AV_PIX_FMT_RGB24, 3 }, |
| 36 | { AV_PIX_FMT_BGR0, 4 }, |
| 37 | { AV_PIX_FMT_BGRA, 5 }, |
| 38 | { AV_PIX_FMT_NONE, 0 }, |
| 39 | }; |
| 40 | |
| 41 | typedef struct { |
| 42 | int count; |
| 43 | } FrmContext; |
| 44 | |
| 45 | static int frm_read_probe(AVProbeData *p) |
| 46 | { |
| 47 | if (p->buf_size > 8 && |
| 48 | p->buf[0] == 'F' && p->buf[1] == 'R' && p->buf[2] == 'M' && |
| 49 | AV_RL16(&p->buf[4]) && AV_RL16(&p->buf[6])) |
| 50 | return AVPROBE_SCORE_MAX / 4; |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int frm_read_header(AVFormatContext *avctx) |
| 55 | { |
| 56 | AVIOContext *pb = avctx->pb; |
| 57 | AVStream *st = avformat_new_stream(avctx, 0); |
| 58 | if (!st) |
| 59 | return AVERROR(ENOMEM); |
| 60 | |
| 61 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| 62 | st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO; |
| 63 | avio_skip(pb, 3); |
| 64 | |
| 65 | st->codecpar->format = avpriv_find_pix_fmt(frm_pix_fmt_tags, avio_r8(pb)); |
| 66 | if (!st->codecpar->format) |
| 67 | return AVERROR_INVALIDDATA; |
| 68 | |
| 69 | st->codecpar->codec_tag = 0; |
| 70 | st->codecpar->width = avio_rl16(pb); |
| 71 | st->codecpar->height = avio_rl16(pb); |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int frm_read_packet(AVFormatContext *avctx, AVPacket *pkt) |
| 76 | { |
| 77 | FrmContext *s = avctx->priv_data; |
| 78 | AVCodecParameters *par = avctx->streams[0]->codecpar; |
| 79 | int packet_size, ret; |
| 80 | |
| 81 | if (s->count) |
| 82 | return AVERROR_EOF; |
| 83 | |
| 84 | packet_size = av_image_get_buffer_size(par->format, par->width, par->height, 1); |
| 85 | if (packet_size < 0) |
| 86 | return AVERROR_INVALIDDATA; |
| 87 | |
| 88 | ret = av_get_packet(avctx->pb, pkt, packet_size); |
| 89 | if (ret < 0) |
| 90 | return ret; |
| 91 | |
| 92 | if (par->format == AV_PIX_FMT_BGRA) { |
| 93 | int i; |
| 94 | for (i = 3; i + 1 <= pkt->size; i += 4) |
| 95 | pkt->data[i] = 0xFF - pkt->data[i]; |
| 96 | } |
| 97 | |
| 98 | pkt->stream_index = 0; |
| 99 | s->count++; |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | AVInputFormat ff_frm_demuxer = { |
| 105 | .name = "frm", |
| 106 | .priv_data_size = sizeof(FrmContext), |
| 107 | .long_name = NULL_IF_CONFIG_SMALL("Megalux Frame"), |
| 108 | .read_probe = frm_read_probe, |
| 109 | .read_header = frm_read_header, |
| 110 | .read_packet = frm_read_packet, |
| 111 | }; |
| 112 |