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FFmpeg/libavformat/cdxl.c
Andreas Rheinhardt bc70684e74 avformat: Constify all muxer/demuxers 
This is possible now that the next-API is gone.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 11:48:06 -03:00

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/*
* 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 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;
st->codecpar->channels = channels;
st->codecpar->channel_layout = channels == 2 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
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 AVInputFormat ff_cdxl_demuxer = {
.name = "cdxl",
.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
.priv_data_size = sizeof(CDXLDemuxContext),
.priv_class = &cdxl_demuxer_class,
.read_probe = cdxl_read_probe,
.read_header = cdxl_read_header,
.read_packet = cdxl_read_packet,
.read_seek = read_seek,
.extensions = "cdxl,xl",
.flags = AVFMT_GENERIC_INDEX,
};
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