| /* |
| * 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 "internal.h" |
| |
| #define CDXL_HEADER_SIZE 32 |
| |
| typedef struct CDXLDemuxContext { |
| AVClass *class; |
| int sample_rate; |
| char *framerate; |
| AVRational fps; |
| int read_chunk; |
| uint8_t header[CDXL_HEADER_SIZE]; |
| int video_stream_index; |
| int audio_stream_index; |
| int64_t filesize; |
| } CDXLDemuxContext; |
| |
| static int cdxl_read_probe(AVProbeData *p) |
| { |
| int score = AVPROBE_SCORE_EXTENSION + 10; |
| |
| if (p->buf_size < CDXL_HEADER_SIZE) |
| return 0; |
| |
| /* reserved bytes should always be set to 0 */ |
| if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10])) |
| return 0; |
| |
| /* check type */ |
| if (p->buf[0] != 1) |
| return 0; |
| |
| /* check palette size */ |
| if (AV_RB16(&p->buf[20]) > 512) |
| return 0; |
| |
| /* check number of planes */ |
| if (p->buf[18] || !p->buf[19]) |
| return 0; |
| |
| /* check widh and height */ |
| if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16])) |
| return 0; |
| |
| /* chunk size */ |
| if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE) |
| return 0; |
| |
| /* previous chunk size */ |
| if (AV_RN32(&p->buf[6])) |
| score /= 2; |
| |
| /* current frame number, usually starts from 1 */ |
| if (AV_RB16(&p->buf[12]) != 1) |
| score /= 2; |
| |
| return score; |
| } |
| |
| static int cdxl_read_header(AVFormatContext *s) |
| { |
| CDXLDemuxContext *cdxl = s->priv_data; |
| int ret; |
| |
| if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) { |
| av_log(s, AV_LOG_ERROR, |
| "Could not parse framerate: %s.\n", cdxl->framerate); |
| return ret; |
| } |
| |
| 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; |
| int64_t pos; |
| int frames, ret; |
| |
| if (avio_feof(pb)) |
| return AVERROR_EOF; |
| |
| pos = avio_tell(pb); |
| if (!cdxl->read_chunk && |
| 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, "non-standard cdxl file\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| 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]); |
| if (FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8; |
| video_size = palette_size + image_size; |
| |
| if (palette_size > 512) |
| return AVERROR_INVALIDDATA; |
| if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE) |
| return AVERROR_INVALIDDATA; |
| |
| 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->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_tag = 0; |
| st->codec->codec_id = AV_CODEC_ID_PCM_S8; |
| if (cdxl->header[1] & 0x10) { |
| st->codec->channels = 2; |
| st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
| } else { |
| st->codec->channels = 1; |
| st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| } |
| st->codec->sample_rate = cdxl->sample_rate; |
| st->start_time = 0; |
| cdxl->audio_stream_index = st->index; |
| avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); |
| } |
| |
| ret = av_get_packet(pb, pkt, audio_size); |
| if (ret < 0) |
| return ret; |
| pkt->stream_index = cdxl->audio_stream_index; |
| pkt->pos = pos; |
| pkt->duration = audio_size; |
| cdxl->read_chunk = 0; |
| } else { |
| if (cdxl->video_stream_index == -1) { |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codec->codec_tag = 0; |
| st->codec->codec_id = AV_CODEC_ID_CDXL; |
| st->codec->width = width; |
| st->codec->height = height; |
| |
| if (audio_size + video_size && cdxl->filesize > 0) { |
| frames = cdxl->filesize / (audio_size + video_size); |
| |
| if(cdxl->framerate) |
| st->duration = frames; |
| else |
| st->duration = frames * (int64_t)audio_size; |
| } |
| st->start_time = 0; |
| cdxl->video_stream_index = st->index; |
| if (cdxl->framerate) |
| avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num); |
| else |
| avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); |
| } |
| |
| if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0) |
| return AVERROR(ENOMEM); |
| memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE); |
| ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size); |
| if (ret < 0) { |
| av_packet_unref(pkt); |
| 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 = pos; |
| pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220; |
| cdxl->read_chunk = audio_size; |
| } |
| |
| if (!cdxl->read_chunk) |
| avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE); |
| return ret; |
| } |
| |
| #define OFFSET(x) offsetof(CDXLDemuxContext, x) |
| static const AVOption cdxl_options[] = { |
| { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
| { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, 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, |
| }; |
| |
| AVInputFormat ff_cdxl_demuxer = { |
| .name = "cdxl", |
| .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), |
| .priv_data_size = sizeof(CDXLDemuxContext), |
| .read_probe = cdxl_read_probe, |
| .read_header = cdxl_read_header, |
| .read_packet = cdxl_read_packet, |
| .extensions = "cdxl,xl", |
| .flags = AVFMT_GENERIC_INDEX, |
| .priv_class = &cdxl_demuxer_class, |
| }; |
