| 1 | /* |
| 2 | * CDXL demuxer |
| 3 | * Copyright (c) 2011-2012 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/channel_layout.h" |
| 23 | #include "libavutil/intreadwrite.h" |
| 24 | #include "libavutil/parseutils.h" |
| 25 | #include "libavutil/opt.h" |
| 26 | #include "avformat.h" |
| 27 | #include "internal.h" |
| 28 | |
| 29 | #define CDXL_HEADER_SIZE 32 |
| 30 | |
| 31 | typedef struct CDXLDemuxContext { |
| 32 | AVClass *class; |
| 33 | int sample_rate; |
| 34 | char *framerate; |
| 35 | AVRational fps; |
| 36 | int read_chunk; |
| 37 | uint8_t header[CDXL_HEADER_SIZE]; |
| 38 | int video_stream_index; |
| 39 | int audio_stream_index; |
| 40 | } CDXLDemuxContext; |
| 41 | |
| 42 | static int cdxl_read_probe(AVProbeData *p) |
| 43 | { |
| 44 | int score = AVPROBE_SCORE_EXTENSION + 10; |
| 45 | |
| 46 | if (p->buf_size < CDXL_HEADER_SIZE) |
| 47 | return 0; |
| 48 | |
| 49 | /* reserved bytes should always be set to 0 */ |
| 50 | if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10])) |
| 51 | return 0; |
| 52 | |
| 53 | /* check type */ |
| 54 | if (p->buf[0] != 1) |
| 55 | return 0; |
| 56 | |
| 57 | /* check palette size */ |
| 58 | if (AV_RB16(&p->buf[20]) > 512) |
| 59 | return 0; |
| 60 | |
| 61 | /* check number of planes */ |
| 62 | if (p->buf[18] || !p->buf[19]) |
| 63 | return 0; |
| 64 | |
| 65 | /* check widh and height */ |
| 66 | if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16])) |
| 67 | return 0; |
| 68 | |
| 69 | /* chunk size */ |
| 70 | if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE) |
| 71 | return 0; |
| 72 | |
| 73 | /* previous chunk size */ |
| 74 | if (AV_RN32(&p->buf[6])) |
| 75 | score /= 2; |
| 76 | |
| 77 | /* current frame number, usually starts from 1 */ |
| 78 | if (AV_RB16(&p->buf[12]) != 1) |
| 79 | score /= 2; |
| 80 | |
| 81 | return score; |
| 82 | } |
| 83 | |
| 84 | static int cdxl_read_header(AVFormatContext *s) |
| 85 | { |
| 86 | CDXLDemuxContext *cdxl = s->priv_data; |
| 87 | int ret; |
| 88 | |
| 89 | if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) { |
| 90 | av_log(s, AV_LOG_ERROR, |
| 91 | "Could not parse framerate: %s.\n", cdxl->framerate); |
| 92 | return ret; |
| 93 | } |
| 94 | |
| 95 | cdxl->read_chunk = 0; |
| 96 | cdxl->video_stream_index = -1; |
| 97 | cdxl->audio_stream_index = -1; |
| 98 | |
| 99 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 105 | { |
| 106 | CDXLDemuxContext *cdxl = s->priv_data; |
| 107 | AVIOContext *pb = s->pb; |
| 108 | uint32_t current_size, video_size, image_size; |
| 109 | uint16_t audio_size, palette_size, width, height; |
| 110 | int64_t pos; |
| 111 | int ret; |
| 112 | |
| 113 | if (avio_feof(pb)) |
| 114 | return AVERROR_EOF; |
| 115 | |
| 116 | pos = avio_tell(pb); |
| 117 | if (!cdxl->read_chunk && |
| 118 | avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE) |
| 119 | return AVERROR_EOF; |
| 120 | if (cdxl->header[0] != 1) { |
| 121 | av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n"); |
| 122 | return AVERROR_INVALIDDATA; |
| 123 | } |
| 124 | |
| 125 | current_size = AV_RB32(&cdxl->header[2]); |
| 126 | width = AV_RB16(&cdxl->header[14]); |
| 127 | height = AV_RB16(&cdxl->header[16]); |
| 128 | palette_size = AV_RB16(&cdxl->header[20]); |
| 129 | audio_size = AV_RB16(&cdxl->header[22]); |
| 130 | if (FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX) |
| 131 | return AVERROR_INVALIDDATA; |
| 132 | image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8; |
| 133 | video_size = palette_size + image_size; |
| 134 | |
| 135 | if (palette_size > 512) |
| 136 | return AVERROR_INVALIDDATA; |
| 137 | if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE) |
| 138 | return AVERROR_INVALIDDATA; |
| 139 | |
| 140 | if (cdxl->read_chunk && audio_size) { |
| 141 | if (cdxl->audio_stream_index == -1) { |
| 142 | AVStream *st = avformat_new_stream(s, NULL); |
| 143 | if (!st) |
| 144 | return AVERROR(ENOMEM); |
| 145 | |
| 146 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 147 | st->codec->codec_tag = 0; |
| 148 | st->codec->codec_id = AV_CODEC_ID_PCM_S8; |
| 149 | if (cdxl->header[1] & 0x10) { |
| 150 | st->codec->channels = 2; |
| 151 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
| 152 | } else { |
| 153 | st->codec->channels = 1; |
| 154 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| 155 | } |
| 156 | st->codec->sample_rate = cdxl->sample_rate; |
| 157 | st->start_time = 0; |
| 158 | cdxl->audio_stream_index = st->index; |
| 159 | avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); |
| 160 | } |
| 161 | |
| 162 | ret = av_get_packet(pb, pkt, audio_size); |
| 163 | if (ret < 0) |
| 164 | return ret; |
| 165 | pkt->stream_index = cdxl->audio_stream_index; |
| 166 | pkt->pos = pos; |
| 167 | pkt->duration = audio_size; |
| 168 | cdxl->read_chunk = 0; |
| 169 | } else { |
| 170 | if (cdxl->video_stream_index == -1) { |
| 171 | AVStream *st = avformat_new_stream(s, NULL); |
| 172 | if (!st) |
| 173 | return AVERROR(ENOMEM); |
| 174 | |
| 175 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 176 | st->codec->codec_tag = 0; |
| 177 | st->codec->codec_id = AV_CODEC_ID_CDXL; |
| 178 | st->codec->width = width; |
| 179 | st->codec->height = height; |
| 180 | st->start_time = 0; |
| 181 | cdxl->video_stream_index = st->index; |
| 182 | if (cdxl->framerate) |
| 183 | avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num); |
| 184 | else |
| 185 | avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); |
| 186 | } |
| 187 | |
| 188 | if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0) |
| 189 | return AVERROR(ENOMEM); |
| 190 | memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE); |
| 191 | ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size); |
| 192 | if (ret < 0) { |
| 193 | av_free_packet(pkt); |
| 194 | return ret; |
| 195 | } |
| 196 | av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret); |
| 197 | pkt->stream_index = cdxl->video_stream_index; |
| 198 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 199 | pkt->pos = pos; |
| 200 | pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220; |
| 201 | cdxl->read_chunk = audio_size; |
| 202 | } |
| 203 | |
| 204 | if (!cdxl->read_chunk) |
| 205 | avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE); |
| 206 | return ret; |
| 207 | } |
| 208 | |
| 209 | #define OFFSET(x) offsetof(CDXLDemuxContext, x) |
| 210 | static const AVOption cdxl_options[] = { |
| 211 | { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
| 212 | { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, |
| 213 | { NULL }, |
| 214 | }; |
| 215 | |
| 216 | static const AVClass cdxl_demuxer_class = { |
| 217 | .class_name = "CDXL demuxer", |
| 218 | .item_name = av_default_item_name, |
| 219 | .option = cdxl_options, |
| 220 | .version = LIBAVUTIL_VERSION_INT, |
| 221 | }; |
| 222 | |
| 223 | AVInputFormat ff_cdxl_demuxer = { |
| 224 | .name = "cdxl", |
| 225 | .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), |
| 226 | .priv_data_size = sizeof(CDXLDemuxContext), |
| 227 | .read_probe = cdxl_read_probe, |
| 228 | .read_header = cdxl_read_header, |
| 229 | .read_packet = cdxl_read_packet, |
| 230 | .extensions = "cdxl,xl", |
| 231 | .flags = AVFMT_GENERIC_INDEX, |
| 232 | .priv_class = &cdxl_demuxer_class, |
| 233 | }; |