libavformat/dsicin.c

   1 /*
   2  * Delphine Software International CIN File Demuxer
   3  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file dsicin.c
  24  * Delphine Software International CIN file demuxer
  25  */
  26
  27 #include "avformat.h"
  28
  29
  30 typedef struct CinFileHeader {
  31     int video_frame_size;
  32     int video_frame_width;
  33     int video_frame_height;
  34     int audio_frequency;
  35     int audio_bits;
  36     int audio_stereo;
  37     int audio_frame_size;
  38 } CinFileHeader;
  39
  40 typedef struct CinFrameHeader {
  41     int audio_frame_type;
  42     int video_frame_type;
  43     int pal_colors_count;
  44     int audio_frame_size;
  45     int video_frame_size;
  46 } CinFrameHeader;
  47
  48 typedef struct CinDemuxContext {
  49     int audio_stream_index;
  50     int video_stream_index;
  51     CinFileHeader file_header;
  52     int64_t audio_stream_pts;
  53     int64_t video_stream_pts;
  54     CinFrameHeader frame_header;
  55     int audio_buffer_size;
  56 } CinDemuxContext;
  57
  58
  59 static int cin_probe(AVProbeData *p)
  60 {
  61     /* header starts with this special marker */
  62     if (AV_RL32(&p->buf[0]) != 0x55AA0000)
  63         return 0;
  64
  65     /* for accuracy, check some header field values */
  66     if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
  67         return 0;
  68
  69     return AVPROBE_SCORE_MAX;
  70 }
  71
  72 static int cin_read_file_header(CinDemuxContext *cin, ByteIOContext *pb) {
  73     CinFileHeader *hdr = &cin->file_header;
  74
  75     if (get_le32(pb) != 0x55AA0000)
  76         return AVERROR_INVALIDDATA;
  77
  78     hdr->video_frame_size   = get_le32(pb);
  79     hdr->video_frame_width  = get_le16(pb);
  80     hdr->video_frame_height = get_le16(pb);
  81     hdr->audio_frequency    = get_le32(pb);
  82     hdr->audio_bits         = get_byte(pb);
  83     hdr->audio_stereo       = get_byte(pb);
  84     hdr->audio_frame_size   = get_le16(pb);
  85
  86     if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
  87         return AVERROR_INVALIDDATA;
  88
  89     return 0;
  90 }
  91
  92 static int cin_read_header(AVFormatContext *s, AVFormatParameters *ap)
  93 {
  94     int rc;
  95     CinDemuxContext *cin = s->priv_data;
  96     CinFileHeader *hdr = &cin->file_header;
  97     ByteIOContext *pb = s->pb;
  98     AVStream *st;
  99
 100     rc = cin_read_file_header(cin, pb);
 101     if (rc)
 102         return rc;
 103
 104     cin->video_stream_pts = 0;
 105     cin->audio_stream_pts = 0;
 106     cin->audio_buffer_size = 0;
 107
 108     /* initialize the video decoder stream */
 109     st = av_new_stream(s, 0);
 110     if (!st)
 111         return AVERROR(ENOMEM);
 112
 113     av_set_pts_info(st, 32, 1, 12);
 114     cin->video_stream_index = st->index;
 115     st->codec->codec_type = CODEC_TYPE_VIDEO;
 116     st->codec->codec_id = CODEC_ID_DSICINVIDEO;
 117     st->codec->codec_tag = 0;  /* no fourcc */
 118     st->codec->width = hdr->video_frame_width;
 119     st->codec->height = hdr->video_frame_height;
 120
 121     /* initialize the audio decoder stream */
 122     st = av_new_stream(s, 0);
 123     if (!st)
 124         return AVERROR(ENOMEM);
 125
 126     av_set_pts_info(st, 32, 1, 22050);
 127     cin->audio_stream_index = st->index;
 128     st->codec->codec_type = CODEC_TYPE_AUDIO;
 129     st->codec->codec_id = CODEC_ID_DSICINAUDIO;
 130     st->codec->codec_tag = 0;  /* no tag */
 131     st->codec->channels = 1;
 132     st->codec->sample_rate = 22050;
 133     st->codec->bits_per_coded_sample = 16;
 134     st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
 135     st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
 136
 137     return 0;
 138 }
 139
 140 static int cin_read_frame_header(CinDemuxContext *cin, ByteIOContext *pb) {
 141     CinFrameHeader *hdr = &cin->frame_header;
 142
 143     hdr->video_frame_type = get_byte(pb);
 144     hdr->audio_frame_type = get_byte(pb);
 145     hdr->pal_colors_count = get_le16(pb);
 146     hdr->video_frame_size = get_le32(pb);
 147     hdr->audio_frame_size = get_le32(pb);
 148
 149     if (url_feof(pb) || url_ferror(pb))
 150         return AVERROR(EIO);
 151
 152     if (get_le32(pb) != 0xAA55AA55)
 153         return AVERROR_INVALIDDATA;
 154
 155     return 0;
 156 }
 157
 158 static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
 159 {
 160     CinDemuxContext *cin = s->priv_data;
 161     ByteIOContext *pb = s->pb;
 162     CinFrameHeader *hdr = &cin->frame_header;
 163     int rc, palette_type, pkt_size;
 164
 165     if (cin->audio_buffer_size == 0) {
 166         rc = cin_read_frame_header(cin, pb);
 167         if (rc)
 168             return rc;
 169
 170         if ((int16_t)hdr->pal_colors_count < 0) {
 171             hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
 172             palette_type = 1;
 173         } else {
 174             palette_type = 0;
 175         }
 176
 177         /* palette and video packet */
 178         pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
 179
 180         if (av_new_packet(pkt, 4 + pkt_size))
 181             return AVERROR(ENOMEM);
 182
 183         pkt->stream_index = cin->video_stream_index;
 184         pkt->pts = cin->video_stream_pts++;
 185
 186         pkt->data[0] = palette_type;
 187         pkt->data[1] = hdr->pal_colors_count & 0xFF;
 188         pkt->data[2] = hdr->pal_colors_count >> 8;
 189         pkt->data[3] = hdr->video_frame_type;
 190
 191         if (get_buffer(pb, &pkt->data[4], pkt_size) != pkt_size)
 192             return AVERROR(EIO);
 193
 194         /* sound buffer will be processed on next read_packet() call */
 195         cin->audio_buffer_size = hdr->audio_frame_size;
 196         return 0;
 197     }
 198
 199     /* audio packet */
 200     if (av_new_packet(pkt, cin->audio_buffer_size))
 201         return AVERROR(ENOMEM);
 202
 203     pkt->stream_index = cin->audio_stream_index;
 204     pkt->pts = cin->audio_stream_pts;
 205     cin->audio_stream_pts += cin->audio_buffer_size * 2 / cin->file_header.audio_frame_size;
 206
 207     if (get_buffer(pb, pkt->data, cin->audio_buffer_size) != cin->audio_buffer_size)
 208         return AVERROR(EIO);
 209
 210     cin->audio_buffer_size = 0;
 211     return 0;
 212 }
 213
 214 AVInputFormat dsicin_demuxer = {
 215     "dsicin",
 216     NULL_IF_CONFIG_SMALL("Delphine Software International CIN format"),
 217     sizeof(CinDemuxContext),
 218     cin_probe,
 219     cin_read_header,
 220     cin_read_packet,
 221 };