yading@11: /*
yading@11:  * Delphine Software International CIN File Demuxer
yading@11:  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Delphine Software International CIN file demuxer
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "avio_internal.h"
yading@11: 
yading@11: 
yading@11: typedef struct CinFileHeader {
yading@11:     int video_frame_size;
yading@11:     int video_frame_width;
yading@11:     int video_frame_height;
yading@11:     int audio_frequency;
yading@11:     int audio_bits;
yading@11:     int audio_stereo;
yading@11:     int audio_frame_size;
yading@11: } CinFileHeader;
yading@11: 
yading@11: typedef struct CinFrameHeader {
yading@11:     int audio_frame_type;
yading@11:     int video_frame_type;
yading@11:     int pal_colors_count;
yading@11:     int audio_frame_size;
yading@11:     int video_frame_size;
yading@11: } CinFrameHeader;
yading@11: 
yading@11: typedef struct CinDemuxContext {
yading@11:     int audio_stream_index;
yading@11:     int video_stream_index;
yading@11:     CinFileHeader file_header;
yading@11:     int64_t audio_stream_pts;
yading@11:     int64_t video_stream_pts;
yading@11:     CinFrameHeader frame_header;
yading@11:     int audio_buffer_size;
yading@11: } CinDemuxContext;
yading@11: 
yading@11: 
yading@11: static int cin_probe(AVProbeData *p)
yading@11: {
yading@11:     /* header starts with this special marker */
yading@11:     if (AV_RL32(&p->buf[0]) != 0x55AA0000)
yading@11:         return 0;
yading@11: 
yading@11:     /* for accuracy, check some header field values */
yading@11:     if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
yading@11:         return 0;
yading@11: 
yading@11:     return AVPROBE_SCORE_MAX;
yading@11: }
yading@11: 
yading@11: static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
yading@11:     CinFileHeader *hdr = &cin->file_header;
yading@11: 
yading@11:     if (avio_rl32(pb) != 0x55AA0000)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     hdr->video_frame_size   = avio_rl32(pb);
yading@11:     hdr->video_frame_width  = avio_rl16(pb);
yading@11:     hdr->video_frame_height = avio_rl16(pb);
yading@11:     hdr->audio_frequency    = avio_rl32(pb);
yading@11:     hdr->audio_bits         = avio_r8(pb);
yading@11:     hdr->audio_stereo       = avio_r8(pb);
yading@11:     hdr->audio_frame_size   = avio_rl16(pb);
yading@11: 
yading@11:     if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int cin_read_header(AVFormatContext *s)
yading@11: {
yading@11:     int rc;
yading@11:     CinDemuxContext *cin = s->priv_data;
yading@11:     CinFileHeader *hdr = &cin->file_header;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st;
yading@11: 
yading@11:     rc = cin_read_file_header(cin, pb);
yading@11:     if (rc)
yading@11:         return rc;
yading@11: 
yading@11:     cin->video_stream_pts = 0;
yading@11:     cin->audio_stream_pts = 0;
yading@11:     cin->audio_buffer_size = 0;
yading@11: 
yading@11:     /* initialize the video decoder stream */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     avpriv_set_pts_info(st, 32, 1, 12);
yading@11:     cin->video_stream_index = st->index;
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_DSICINVIDEO;
yading@11:     st->codec->codec_tag = 0;  /* no fourcc */
yading@11:     st->codec->width = hdr->video_frame_width;
yading@11:     st->codec->height = hdr->video_frame_height;
yading@11: 
yading@11:     /* initialize the audio decoder stream */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     avpriv_set_pts_info(st, 32, 1, 22050);
yading@11:     cin->audio_stream_index = st->index;
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_DSICINAUDIO;
yading@11:     st->codec->codec_tag = 0;  /* no tag */
yading@11:     st->codec->channels = 1;
yading@11:     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:     st->codec->sample_rate = 22050;
yading@11:     st->codec->bits_per_coded_sample = 8;
yading@11:     st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
yading@11:     CinFrameHeader *hdr = &cin->frame_header;
yading@11: 
yading@11:     hdr->video_frame_type = avio_r8(pb);
yading@11:     hdr->audio_frame_type = avio_r8(pb);
yading@11:     hdr->pal_colors_count = avio_rl16(pb);
yading@11:     hdr->video_frame_size = avio_rl32(pb);
yading@11:     hdr->audio_frame_size = avio_rl32(pb);
yading@11: 
yading@11:     if (url_feof(pb) || pb->error)
yading@11:         return AVERROR(EIO);
yading@11: 
yading@11:     if (avio_rl32(pb) != 0xAA55AA55)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     CinDemuxContext *cin = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     CinFrameHeader *hdr = &cin->frame_header;
yading@11:     int rc, palette_type, pkt_size;
yading@11:     int ret;
yading@11: 
yading@11:     if (cin->audio_buffer_size == 0) {
yading@11:         rc = cin_read_frame_header(cin, pb);
yading@11:         if (rc)
yading@11:             return rc;
yading@11: 
yading@11:         if ((int16_t)hdr->pal_colors_count < 0) {
yading@11:             hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
yading@11:             palette_type = 1;
yading@11:         } else {
yading@11:             palette_type = 0;
yading@11:         }
yading@11: 
yading@11:         /* palette and video packet */
yading@11:         pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
yading@11: 
yading@11:         pkt_size = ffio_limit(pb, pkt_size);
yading@11: 
yading@11:         ret = av_new_packet(pkt, 4 + pkt_size);
yading@11:         if (ret < 0)
yading@11:             return ret;
yading@11: 
yading@11:         pkt->stream_index = cin->video_stream_index;
yading@11:         pkt->pts = cin->video_stream_pts++;
yading@11: 
yading@11:         pkt->data[0] = palette_type;
yading@11:         pkt->data[1] = hdr->pal_colors_count & 0xFF;
yading@11:         pkt->data[2] = hdr->pal_colors_count >> 8;
yading@11:         pkt->data[3] = hdr->video_frame_type;
yading@11: 
yading@11:         ret = avio_read(pb, &pkt->data[4], pkt_size);
yading@11:         if (ret < 0) {
yading@11:             av_free_packet(pkt);
yading@11:             return ret;
yading@11:         }
yading@11:         if (ret < pkt_size)
yading@11:             av_shrink_packet(pkt, 4 + ret);
yading@11: 
yading@11:         /* sound buffer will be processed on next read_packet() call */
yading@11:         cin->audio_buffer_size = hdr->audio_frame_size;
yading@11:         return 0;
yading@11:     }
yading@11: 
yading@11:     /* audio packet */
yading@11:     ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     pkt->stream_index = cin->audio_stream_index;
yading@11:     pkt->pts = cin->audio_stream_pts;
yading@11:     pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
yading@11:     cin->audio_stream_pts += pkt->duration;
yading@11:     cin->audio_buffer_size = 0;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_dsicin_demuxer = {
yading@11:     .name           = "dsicin",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
yading@11:     .priv_data_size = sizeof(CinDemuxContext),
yading@11:     .read_probe     = cin_probe,
yading@11:     .read_header    = cin_read_header,
yading@11:     .read_packet    = cin_read_packet,
yading@11: };