| /* | |
| * CDXL demuxer | |
| * Copyright (c) 2011-2012 Paul B Mahol | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| #include "libavutil/channel_layout.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "libavutil/parseutils.h" | |
| #include "libavutil/opt.h" | |
| #include "avformat.h" | |
| #include "demux.h" | |
| #include "internal.h" | |
| #define CDXL_HEADER_SIZE 32 | |
| typedef struct CDXLDemuxContext { | |
| AVClass *class; | |
| int read_chunk; | |
| AVRational frate; | |
| int srate; | |
| AVRational frame_rate; | |
| int sample_rate; | |
| uint8_t header[CDXL_HEADER_SIZE]; | |
| int video_stream_index; | |
| int audio_stream_index; | |
| int64_t filesize; | |
| int64_t pos; | |
| } CDXLDemuxContext; | |
| static int cdxl_read_probe(const AVProbeData *p) | |
| { | |
| int score = AVPROBE_SCORE_EXTENSION + 10; | |
| const uint8_t *buf = p->buf; | |
| if (p->buf_size < CDXL_HEADER_SIZE) | |
| return 0; | |
| /* check type */ | |
| if (buf[0] > 1) | |
| return 0; | |
| /* reserved bytes should always be set to 0 */ | |
| if (AV_RL24(&buf[29])) | |
| return 0; | |
| /* check palette size */ | |
| if (!AV_RN16(&buf[20])) | |
| return 0; | |
| if (buf[0] == 1 && AV_RB16(&buf[20]) > 512) | |
| return 0; | |
| if (buf[0] == 0 && AV_RB16(&buf[20]) > 768) | |
| return 0; | |
| if (!AV_RN16(&buf[22]) && AV_RN16(&buf[24])) | |
| return 0; | |
| if (buf[0] == 0 && (!buf[26] || !AV_RB16(&buf[24]))) | |
| return 0; | |
| /* check number of planes */ | |
| if (buf[19] != 6 && buf[19] != 8 && buf[19] != 24) | |
| return 0; | |
| if (buf[18]) | |
| return 0; | |
| /* check widh and height */ | |
| if (AV_RB16(&buf[14]) > 640 || AV_RB16(&buf[16]) > 480 || | |
| AV_RB16(&buf[14]) == 0 || AV_RB16(&buf[16]) == 0) | |
| return 0; | |
| /* chunk size */ | |
| if (AV_RB32(&buf[2]) <= AV_RB16(&buf[20]) + AV_RB16(&buf[22]) * (1 + !!(buf[1] & 0x10)) + CDXL_HEADER_SIZE) | |
| return 0; | |
| /* previous chunk size */ | |
| if (AV_RN32(&buf[6])) | |
| score /= 2; | |
| /* current frame number, usually starts from 1 */ | |
| if (AV_RB32(&buf[10]) != 1) | |
| score /= 2; | |
| return score; | |
| } | |
| static int cdxl_read_header(AVFormatContext *s) | |
| { | |
| CDXLDemuxContext *cdxl = s->priv_data; | |
| cdxl->read_chunk = 0; | |
| cdxl->video_stream_index = -1; | |
| cdxl->audio_stream_index = -1; | |
| cdxl->filesize = avio_size(s->pb); | |
| s->ctx_flags |= AVFMTCTX_NOHEADER; | |
| return 0; | |
| } | |
| static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| { | |
| CDXLDemuxContext *cdxl = s->priv_data; | |
| AVIOContext *pb = s->pb; | |
| uint32_t current_size, video_size, image_size; | |
| uint16_t audio_size, palette_size, width, height; | |
| int channels, type, format, ret; | |
| if (avio_feof(pb)) | |
| return AVERROR_EOF; | |
| if (!cdxl->read_chunk) { | |
| cdxl->pos = avio_tell(pb); | |
| if (avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE) | |
| return AVERROR_EOF; | |
| } | |
| if (cdxl->header[0] > 1) { | |
| av_log(s, AV_LOG_ERROR, "unsupported cdxl file\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| type = cdxl->header[0]; | |
| channels = 1 + !!(cdxl->header[1] & 0x10); | |
| format = cdxl->header[1] & 0xE0; | |
| current_size = AV_RB32(&cdxl->header[2]); | |
| width = AV_RB16(&cdxl->header[14]); | |
| height = AV_RB16(&cdxl->header[16]); | |
| palette_size = AV_RB16(&cdxl->header[20]); | |
| audio_size = AV_RB16(&cdxl->header[22]) * channels; | |
| cdxl->srate = AV_RB16(&cdxl->header[24]); | |
| if (!cdxl->srate && audio_size) | |
| cdxl->srate = cdxl->sample_rate; | |
| cdxl->frate.num = cdxl->header[26]; | |
| cdxl->frate.den = 1; | |
| if (cdxl->header[19] == 0 || | |
| FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX) | |
| return AVERROR_INVALIDDATA; | |
| if (format == 0x20) | |
| image_size = width * height * cdxl->header[19] / 8; | |
| else | |
| image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8; | |
| video_size = palette_size + image_size; | |
| if ((type == 1 && palette_size > 512) || | |
| (type == 0 && palette_size > 768)) | |
| return AVERROR_INVALIDDATA; | |
| if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE) | |
| return AVERROR_INVALIDDATA; | |
| if (!cdxl->frate.num && audio_size && cdxl->srate > 0) { | |
| cdxl->frate = (AVRational){ cdxl->srate, audio_size }; | |
| } else if (!cdxl->frate.num) { | |
| cdxl->frate = cdxl->frame_rate; | |
| } | |
| if (cdxl->read_chunk && audio_size) { | |
| if (cdxl->audio_stream_index == -1) { | |
| AVStream *st = avformat_new_stream(s, NULL); | |
| if (!st) | |
| return AVERROR(ENOMEM); | |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| st->codecpar->codec_tag = 0; | |
| st->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR; | |
| av_channel_layout_default(&st->codecpar->ch_layout, channels); | |
| st->codecpar->sample_rate= cdxl->srate; | |
| st->start_time = 0; | |
| cdxl->audio_stream_index = st->index; | |
| avpriv_set_pts_info(st, 64, 1, cdxl->srate); | |
| if (current_size && cdxl->filesize > 0 && audio_size > 0) | |
| st->duration = (cdxl->filesize / current_size) * audio_size / channels; | |
| } | |
| ret = av_get_packet(pb, pkt, audio_size); | |
| if (ret < 0) | |
| return ret; | |
| pkt->stream_index = cdxl->audio_stream_index; | |
| pkt->pos = cdxl->pos; | |
| pkt->duration = audio_size / channels; | |
| cdxl->read_chunk = 0; | |
| } else { | |
| if (cdxl->video_stream_index == -1) { | |
| AVStream *st = avformat_new_stream(s, NULL); | |
| if (!st) | |
| return AVERROR(ENOMEM); | |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| st->codecpar->codec_tag = 0; | |
| st->codecpar->codec_id = AV_CODEC_ID_CDXL; | |
| st->codecpar->width = width; | |
| st->codecpar->height = height; | |
| if (current_size && cdxl->filesize > 0) | |
| st->nb_frames = cdxl->filesize / current_size; | |
| st->start_time = 0; | |
| cdxl->video_stream_index = st->index; | |
| avpriv_set_pts_info(st, 64, cdxl->frate.den, cdxl->frate.num); | |
| } | |
| if ((ret = av_new_packet(pkt, video_size + CDXL_HEADER_SIZE)) < 0) | |
| return ret; | |
| memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE); | |
| ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size); | |
| if (ret < 0) { | |
| return ret; | |
| } | |
| av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret); | |
| pkt->stream_index = cdxl->video_stream_index; | |
| pkt->flags |= AV_PKT_FLAG_KEY; | |
| pkt->pos = cdxl->pos; | |
| pkt->duration = 1; | |
| cdxl->read_chunk = audio_size; | |
| } | |
| if (!cdxl->read_chunk) | |
| avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE); | |
| return ret; | |
| } | |
| static int read_seek(AVFormatContext *s, int stream_index, | |
| int64_t timestamp, int flags) | |
| { | |
| CDXLDemuxContext *cdxl = s->priv_data; | |
| cdxl->read_chunk = 0; | |
| return -1; | |
| } | |
| #define OFFSET(x) offsetof(CDXLDemuxContext, x) | |
| static const AVOption cdxl_options[] = { | |
| { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64=11025 }, 8000, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, | |
| { "frame_rate", "", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, { .str="15" }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, | |
| { NULL }, | |
| }; | |
| static const AVClass cdxl_demuxer_class = { | |
| .class_name = "CDXL demuxer", | |
| .item_name = av_default_item_name, | |
| .option = cdxl_options, | |
| .version = LIBAVUTIL_VERSION_INT, | |
| }; | |
| const FFInputFormat ff_cdxl_demuxer = { | |
| .p.name = "cdxl", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), | |
| .p.priv_class = &cdxl_demuxer_class, | |
| .p.extensions = "cdxl,xl", | |
| .p.flags = AVFMT_GENERIC_INDEX, | |
| .priv_data_size = sizeof(CDXLDemuxContext), | |
| .read_probe = cdxl_read_probe, | |
| .read_header = cdxl_read_header, | |
| .read_packet = cdxl_read_packet, | |
| .read_seek = read_seek, | |
| }; |