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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * CDXL demuxer |
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| 3 | * Copyright (c) 2011-2012 Paul B Mahol |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/channel_layout.h" |
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| 23 | #include "libavutil/intreadwrite.h" |
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| 24 | #include "libavutil/parseutils.h" |
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| 25 | #include "libavutil/opt.h" |
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| 26 | #include "avformat.h" |
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| 27 | #include "internal.h" |
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| 28 | |||
| 29 | #define CDXL_HEADER_SIZE 32 |
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| 30 | |||
| 31 | typedef struct CDXLDemuxContext { |
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| 32 | AVClass *class; |
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| 33 | int sample_rate; |
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| 34 | char *framerate; |
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| 35 | AVRational fps; |
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| 36 | int read_chunk; |
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| 37 | uint8_t header[CDXL_HEADER_SIZE]; |
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| 38 | int video_stream_index; |
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| 39 | int audio_stream_index; |
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| 40 | } CDXLDemuxContext; |
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| 41 | |||
| 42 | static int cdxl_read_probe(AVProbeData *p) |
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| 43 | { |
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| 44 | int score = AVPROBE_SCORE_EXTENSION + 10; |
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| 45 | |||
| 46 | if (p->buf_size < CDXL_HEADER_SIZE) |
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| 47 | return 0; |
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| 48 | |||
| 49 | /* reserved bytes should always be set to 0 */ |
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| 50 | if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10])) |
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| 51 | return 0; |
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| 52 | |||
| 53 | /* check type */ |
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| 54 | if (p->buf[0] != 1) |
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| 55 | return 0; |
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| 56 | |||
| 57 | /* check palette size */ |
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| 58 | if (AV_RB16(&p->buf[20]) > 512) |
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| 59 | return 0; |
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| 60 | |||
| 61 | /* check number of planes */ |
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| 62 | if (p->buf[18] || !p->buf[19]) |
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| 63 | return 0; |
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| 64 | |||
| 65 | /* check widh and height */ |
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| 66 | if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16])) |
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| 67 | return 0; |
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| 68 | |||
| 69 | /* chunk size */ |
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| 70 | if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE) |
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| 71 | return 0; |
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| 72 | |||
| 73 | /* previous chunk size */ |
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| 74 | if (AV_RN32(&p->buf[6])) |
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| 75 | score /= 2; |
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| 76 | |||
| 77 | /* current frame number, usually starts from 1 */ |
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| 78 | if (AV_RB16(&p->buf[12]) != 1) |
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| 79 | score /= 2; |
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| 80 | |||
| 81 | return score; |
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| 82 | } |
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| 83 | |||
| 84 | static int cdxl_read_header(AVFormatContext *s) |
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| 85 | { |
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| 86 | CDXLDemuxContext *cdxl = s->priv_data; |
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| 87 | int ret; |
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| 88 | |||
| 89 | if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) { |
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| 90 | av_log(s, AV_LOG_ERROR, |
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| 91 | "Could not parse framerate: %s.\n", cdxl->framerate); |
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| 92 | return ret; |
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| 93 | } |
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| 94 | |||
| 95 | cdxl->read_chunk = 0; |
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| 96 | cdxl->video_stream_index = -1; |
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| 97 | cdxl->audio_stream_index = -1; |
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| 98 | |||
| 99 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
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| 100 | |||
| 101 | return 0; |
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| 102 | } |
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| 103 | |||
| 104 | static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 105 | { |
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| 106 | CDXLDemuxContext *cdxl = s->priv_data; |
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| 107 | AVIOContext *pb = s->pb; |
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| 108 | uint32_t current_size, video_size, image_size; |
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| 109 | uint16_t audio_size, palette_size, width, height; |
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| 110 | int64_t pos; |
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| 111 | int ret; |
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| 112 | |||
| 113 | if (url_feof(pb)) |
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| 114 | return AVERROR_EOF; |
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| 115 | |||
| 116 | pos = avio_tell(pb); |
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| 117 | if (!cdxl->read_chunk && |
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| 118 | avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE) |
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| 119 | return AVERROR_EOF; |
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| 120 | if (cdxl->header[0] != 1) { |
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| 121 | av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n"); |
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| 122 | return AVERROR_INVALIDDATA; |
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| 123 | } |
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| 124 | |||
| 125 | current_size = AV_RB32(&cdxl->header[2]); |
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| 126 | width = AV_RB16(&cdxl->header[14]); |
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| 127 | height = AV_RB16(&cdxl->header[16]); |
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| 128 | palette_size = AV_RB16(&cdxl->header[20]); |
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| 129 | audio_size = AV_RB16(&cdxl->header[22]); |
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| 130 | image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8; |
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| 131 | video_size = palette_size + image_size; |
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| 132 | |||
| 133 | if (palette_size > 512) |
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| 134 | return AVERROR_INVALIDDATA; |
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| 135 | if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE) |
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| 136 | return AVERROR_INVALIDDATA; |
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| 137 | |||
| 138 | if (cdxl->read_chunk && audio_size) { |
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| 139 | if (cdxl->audio_stream_index == -1) { |
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| 140 | AVStream *st = avformat_new_stream(s, NULL); |
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| 141 | if (!st) |
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| 142 | return AVERROR(ENOMEM); |
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| 143 | |||
| 144 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 145 | st->codec->codec_tag = 0; |
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| 146 | st->codec->codec_id = AV_CODEC_ID_PCM_S8; |
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| 147 | if (cdxl->header[1] & 0x10) { |
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| 148 | st->codec->channels = 2; |
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| 149 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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| 150 | } else { |
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| 151 | st->codec->channels = 1; |
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| 152 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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| 153 | } |
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| 154 | st->codec->sample_rate = cdxl->sample_rate; |
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| 155 | st->start_time = 0; |
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| 156 | cdxl->audio_stream_index = st->index; |
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| 157 | avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); |
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| 158 | } |
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| 159 | |||
| 160 | ret = av_get_packet(pb, pkt, audio_size); |
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| 161 | if (ret < 0) |
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| 162 | return ret; |
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| 163 | pkt->stream_index = cdxl->audio_stream_index; |
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| 164 | pkt->pos = pos; |
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| 165 | pkt->duration = audio_size; |
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| 166 | cdxl->read_chunk = 0; |
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| 167 | } else { |
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| 168 | if (cdxl->video_stream_index == -1) { |
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| 169 | AVStream *st = avformat_new_stream(s, NULL); |
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| 170 | if (!st) |
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| 171 | return AVERROR(ENOMEM); |
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| 172 | |||
| 173 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 174 | st->codec->codec_tag = 0; |
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| 175 | st->codec->codec_id = AV_CODEC_ID_CDXL; |
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| 176 | st->codec->width = width; |
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| 177 | st->codec->height = height; |
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| 178 | st->start_time = 0; |
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| 179 | cdxl->video_stream_index = st->index; |
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| 180 | if (cdxl->framerate) |
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| 181 | avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num); |
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| 182 | else |
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| 183 | avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); |
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| 184 | } |
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| 185 | |||
| 186 | if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0) |
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| 187 | return AVERROR(ENOMEM); |
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| 188 | memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE); |
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| 189 | ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size); |
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| 190 | if (ret < 0) { |
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| 191 | av_free_packet(pkt); |
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| 192 | return ret; |
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| 193 | } |
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| 194 | av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret); |
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| 195 | pkt->stream_index = cdxl->video_stream_index; |
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| 196 | pkt->flags |= AV_PKT_FLAG_KEY; |
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| 197 | pkt->pos = pos; |
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| 198 | pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220; |
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| 199 | cdxl->read_chunk = audio_size; |
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| 200 | } |
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| 201 | |||
| 202 | if (!cdxl->read_chunk) |
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| 203 | avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE); |
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| 204 | return ret; |
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| 205 | } |
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| 206 | |||
| 207 | #define OFFSET(x) offsetof(CDXLDemuxContext, x) |
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| 208 | static const AVOption cdxl_options[] = { |
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| 209 | { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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| 210 | { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, |
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| 211 | { NULL }, |
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| 212 | }; |
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| 213 | |||
| 214 | static const AVClass cdxl_demuxer_class = { |
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| 215 | .class_name = "CDXL demuxer", |
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| 216 | .item_name = av_default_item_name, |
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| 217 | .option = cdxl_options, |
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| 218 | .version = LIBAVUTIL_VERSION_INT, |
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| 219 | }; |
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| 220 | |||
| 221 | AVInputFormat ff_cdxl_demuxer = { |
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| 222 | .name = "cdxl", |
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| 223 | .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), |
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| 224 | .priv_data_size = sizeof(CDXLDemuxContext), |
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| 225 | .read_probe = cdxl_read_probe, |
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| 226 | .read_header = cdxl_read_header, |
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| 227 | .read_packet = cdxl_read_packet, |
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| 228 | .extensions = "cdxl,xl", |
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| 229 | .flags = AVFMT_GENERIC_INDEX, |
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| 230 | .priv_class = &cdxl_demuxer_class, |
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| 231 | }; |