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/*
* Delphine Software International CIN File Demuxer
* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Delphine Software International CIN file demuxer
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
typedef struct CinFileHeader {
int video_frame_size;
int video_frame_width;
int video_frame_height;
int audio_frequency;
int audio_bits;
int audio_stereo;
int audio_frame_size;
} CinFileHeader;
typedef struct CinFrameHeader {
int audio_frame_type;
int video_frame_type;
int pal_colors_count;
int audio_frame_size;
int video_frame_size;
} CinFrameHeader;
typedef struct CinDemuxContext {
int audio_stream_index;
int video_stream_index;
CinFileHeader file_header;
int64_t audio_stream_pts;
int64_t video_stream_pts;
CinFrameHeader frame_header;
int audio_buffer_size;
} CinDemuxContext;
static int cin_probe(AVProbeData *p)
{
/* header starts with this special marker */
if (AV_RL32(&p->buf[0]) != 0x55AA0000)
return 0;
/* for accuracy, check some header field values */
if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
return 0;
return AVPROBE_SCORE_MAX;
}
static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
CinFileHeader *hdr = &cin->file_header;
if (avio_rl32(pb) != 0x55AA0000)
return AVERROR_INVALIDDATA;
hdr->video_frame_size = avio_rl32(pb);
hdr->video_frame_width = avio_rl16(pb);
hdr->video_frame_height = avio_rl16(pb);
hdr->audio_frequency = avio_rl32(pb);
hdr->audio_bits = avio_r8(pb);
hdr->audio_stereo = avio_r8(pb);
hdr->audio_frame_size = avio_rl16(pb);
if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
return AVERROR_INVALIDDATA;
return 0;
}
static int cin_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
int rc;
CinDemuxContext *cin = s->priv_data;
CinFileHeader *hdr = &cin->file_header;
AVIOContext *pb = s->pb;
AVStream *st;
rc = cin_read_file_header(cin, pb);
if (rc)
return rc;
cin->video_stream_pts = 0;
cin->audio_stream_pts = 0;
cin->audio_buffer_size = 0;
/* initialize the video decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, 12);
cin->video_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_DSICINVIDEO;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = hdr->video_frame_width;
st->codec->height = hdr->video_frame_height;
/* initialize the audio decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, 22050);
cin->audio_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_DSICINAUDIO;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = 1;
st->codec->sample_rate = 22050;
st->codec->bits_per_coded_sample = 8;
st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
return 0;
}
static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
CinFrameHeader *hdr = &cin->frame_header;
hdr->video_frame_type = avio_r8(pb);
hdr->audio_frame_type = avio_r8(pb);
hdr->pal_colors_count = avio_rl16(pb);
hdr->video_frame_size = avio_rl32(pb);
hdr->audio_frame_size = avio_rl32(pb);
if (pb->eof_reached || pb->error)
return AVERROR(EIO);
if (avio_rl32(pb) != 0xAA55AA55)
return AVERROR_INVALIDDATA;
return 0;
}
static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
{
CinDemuxContext *cin = s->priv_data;
AVIOContext *pb = s->pb;
CinFrameHeader *hdr = &cin->frame_header;
int rc, palette_type, pkt_size;
int ret;
if (cin->audio_buffer_size == 0) {
rc = cin_read_frame_header(cin, pb);
if (rc)
return rc;
if ((int16_t)hdr->pal_colors_count < 0) {
hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
palette_type = 1;
} else {
palette_type = 0;
}
/* palette and video packet */
pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
ret = av_new_packet(pkt, 4 + pkt_size);
if (ret < 0)
return ret;
pkt->stream_index = cin->video_stream_index;
pkt->pts = cin->video_stream_pts++;
pkt->data[0] = palette_type;
pkt->data[1] = hdr->pal_colors_count & 0xFF;
pkt->data[2] = hdr->pal_colors_count >> 8;
pkt->data[3] = hdr->video_frame_type;
ret = avio_read(pb, &pkt->data[4], pkt_size);
if (ret < 0) {
av_free_packet(pkt);
return ret;
}
if (ret < pkt_size)
av_shrink_packet(pkt, 4 + ret);
/* sound buffer will be processed on next read_packet() call */
cin->audio_buffer_size = hdr->audio_frame_size;
return 0;
}
/* audio packet */
ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
if (ret < 0)
return ret;
pkt->stream_index = cin->audio_stream_index;
pkt->pts = cin->audio_stream_pts;
pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
cin->audio_stream_pts += pkt->duration;
cin->audio_buffer_size = 0;
return 0;
}
AVInputFormat ff_dsicin_demuxer = {
.name = "dsicin",
.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN format"),
.priv_data_size = sizeof(CinDemuxContext),
.read_probe = cin_probe,
.read_header = cin_read_header,
.read_packet = cin_read_packet,
};
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