mirror of https://git.videolan.org/git/ffmpeg.git
273 lines
8.6 KiB
C
273 lines
8.6 KiB
C
/*
|
|
* 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,
|
|
};
|