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/*
* Delphine Software International CIN File Demuxer
* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
*
* 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
*/
/**
* @file dsicin.c
* Delphine Software International CIN file demuxer
*/
#include "avformat.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, ByteIOContext *pb) {
CinFileHeader *hdr = &cin->file_header;
if (get_le32(pb) != 0x55AA0000)
return AVERROR_INVALIDDATA;
hdr->video_frame_size = get_le32(pb);
hdr->video_frame_width = get_le16(pb);
hdr->video_frame_height = get_le16(pb);
hdr->audio_frequency = get_le32(pb);
hdr->audio_bits = get_byte(pb);
hdr->audio_stereo = get_byte(pb);
hdr->audio_frame_size = get_le16(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;
ByteIOContext *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 = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
av_set_pts_info(st, 32, 1, 12);
cin->video_stream_index = st->index;
st->codec->codec_type = CODEC_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 = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
av_set_pts_info(st, 32, 1, 22050);
cin->audio_stream_index = st->index;
st->codec->codec_type = CODEC_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_sample = 16;
st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample * st->codec->channels;
st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
return 0;
}
static int cin_read_frame_header(CinDemuxContext *cin, ByteIOContext *pb) {
CinFrameHeader *hdr = &cin->frame_header;
hdr->video_frame_type = get_byte(pb);
hdr->audio_frame_type = get_byte(pb);
hdr->pal_colors_count = get_le16(pb);
hdr->video_frame_size = get_le32(pb);
hdr->audio_frame_size = get_le32(pb);
if (url_feof(pb) || url_ferror(pb))
return AVERROR_IO;
if (get_le32(pb) != 0xAA55AA55)
return AVERROR_INVALIDDATA;
return 0;
}
static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
{
CinDemuxContext *cin = s->priv_data;
ByteIOContext *pb = &s->pb;
CinFrameHeader *hdr = &cin->frame_header;
int rc, palette_type, pkt_size;
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;
if (av_new_packet(pkt, 4 + pkt_size))
return AVERROR(ENOMEM);
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;
if (get_buffer(pb, &pkt->data[4], pkt_size) != pkt_size)
return AVERROR_IO;
/* sound buffer will be processed on next read_packet() call */
cin->audio_buffer_size = hdr->audio_frame_size;
return 0;
}
/* audio packet */
if (av_new_packet(pkt, cin->audio_buffer_size))
return AVERROR(ENOMEM);
pkt->stream_index = cin->audio_stream_index;
pkt->pts = cin->audio_stream_pts;
cin->audio_stream_pts += cin->audio_buffer_size * 2 / cin->file_header.audio_frame_size;
if (get_buffer(pb, pkt->data, cin->audio_buffer_size) != cin->audio_buffer_size)
return AVERROR_IO;
cin->audio_buffer_size = 0;
return 0;
}
AVInputFormat dsicin_demuxer = {
"dsicin",
"Delphine Software International CIN format",
sizeof(CinDemuxContext),
cin_probe,
cin_read_header,
cin_read_packet,
};
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