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 libavformat/dsicin.c
  24  * Delphine Software International CIN file demuxer
  25  */
  26
  27 #include "libavutil/intreadwrite.h"
  28 #include "avformat.h"
  29
  30
  31 typedef struct CinFileHeader {
  32     int video_frame_size;
  33     int video_frame_width;
  34     int video_frame_height;
  35     int audio_frequency;
  36     int audio_bits;
  37     int audio_stereo;
  38     int audio_frame_size;
  39 } CinFileHeader;
  40
  41 typedef struct CinFrameHeader {
  42     int audio_frame_type;
  43     int video_frame_type;
  44     int pal_colors_count;
  45     int audio_frame_size;
  46     int video_frame_size;
  47 } CinFrameHeader;
  48
  49 typedef struct CinDemuxContext {
  50     int audio_stream_index;
  51     int video_stream_index;
  52     CinFileHeader file_header;
  53     int64_t audio_stream_pts;
  54     int64_t video_stream_pts;
  55     CinFrameHeader frame_header;
  56     int audio_buffer_size;
  57 } CinDemuxContext;
  58
  59
  60 static int cin_probe(AVProbeData *p)
  61 {
  62     /* header starts with this special marker */
  63     if (AV_RL32(&p->buf[0]) != 0x55AA0000)
  64         return 0;
  65
  66     /* for accuracy, check some header field values */
  67     if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
  68         return 0;
  69
  70     return AVPROBE_SCORE_MAX;
  71 }
  72
  73 static int cin_read_file_header(CinDemuxContext *cin, ByteIOContext *pb) {
  74     CinFileHeader *hdr = &cin->file_header;
  75
  76     if (get_le32(pb) != 0x55AA0000)
  77         return AVERROR_INVALIDDATA;
  78
  79     hdr->video_frame_size   = get_le32(pb);
  80     hdr->video_frame_width  = get_le16(pb);
  81     hdr->video_frame_height = get_le16(pb);
  82     hdr->audio_frequency    = get_le32(pb);
  83     hdr->audio_bits         = get_byte(pb);
  84     hdr->audio_stereo       = get_byte(pb);
  85     hdr->audio_frame_size   = get_le16(pb);
  86
  87     if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
  88         return AVERROR_INVALIDDATA;
  89
  90     return 0;
  91 }
  92
  93 static int cin_read_header(AVFormatContext *s, AVFormatParameters *ap)
  94 {
  95     int rc;
  96     CinDemuxContext *cin = s->priv_data;
  97     CinFileHeader *hdr = &cin->file_header;
  98     ByteIOContext *pb = s->pb;
  99     AVStream *st;
 100
 101     rc = cin_read_file_header(cin, pb);
 102     if (rc)
 103         return rc;
 104
 105     cin->video_stream_pts = 0;
 106     cin->audio_stream_pts = 0;
 107     cin->audio_buffer_size = 0;
 108
 109     /* initialize the video decoder stream */
 110     st = av_new_stream(s, 0);
 111     if (!st)
 112         return AVERROR(ENOMEM);
 113
 114     av_set_pts_info(st, 32, 1, 12);
 115     cin->video_stream_index = st->index;
 116     st->codec->codec_type = CODEC_TYPE_VIDEO;
 117     st->codec->codec_id = CODEC_ID_DSICINVIDEO;
 118     st->codec->codec_tag = 0;  /* no fourcc */
 119     st->codec->width = hdr->video_frame_width;
 120     st->codec->height = hdr->video_frame_height;
 121
 122     /* initialize the audio decoder stream */
 123     st = av_new_stream(s, 0);
 124     if (!st)
 125         return AVERROR(ENOMEM);
 126
 127     av_set_pts_info(st, 32, 1, 22050);
 128     cin->audio_stream_index = st->index;
 129     st->codec->codec_type = CODEC_TYPE_AUDIO;
 130     st->codec->codec_id = CODEC_ID_DSICINAUDIO;
 131     st->codec->codec_tag = 0;  /* no tag */
 132     st->codec->channels = 1;
 133     st->codec->sample_rate = 22050;
 134     st->codec->bits_per_coded_sample = 16;
 135     st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
 136     st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
 137
 138     return 0;
 139 }
 140
 141 static int cin_read_frame_header(CinDemuxContext *cin, ByteIOContext *pb) {
 142     CinFrameHeader *hdr = &cin->frame_header;
 143
 144     hdr->video_frame_type = get_byte(pb);
 145     hdr->audio_frame_type = get_byte(pb);
 146     hdr->pal_colors_count = get_le16(pb);
 147     hdr->video_frame_size = get_le32(pb);
 148     hdr->audio_frame_size = get_le32(pb);
 149
 150     if (url_feof(pb) || url_ferror(pb))
 151         return AVERROR(EIO);
 152
 153     if (get_le32(pb) != 0xAA55AA55)
 154         return AVERROR_INVALIDDATA;
 155
 156     return 0;
 157 }
 158
 159 static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
 160 {
 161     CinDemuxContext *cin = s->priv_data;
 162     ByteIOContext *pb = s->pb;
 163     CinFrameHeader *hdr = &cin->frame_header;
 164     int rc, palette_type, pkt_size;
 165
 166     if (cin->audio_buffer_size == 0) {
 167         rc = cin_read_frame_header(cin, pb);
 168         if (rc)
 169             return rc;
 170
 171         if ((int16_t)hdr->pal_colors_count < 0) {
 172             hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
 173             palette_type = 1;
 174         } else {
 175             palette_type = 0;
 176         }
 177
 178         /* palette and video packet */
 179         pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
 180
 181         if (av_new_packet(pkt, 4 + pkt_size))
 182             return AVERROR(ENOMEM);
 183
 184         pkt->stream_index = cin->video_stream_index;
 185         pkt->pts = cin->video_stream_pts++;
 186
 187         pkt->data[0] = palette_type;
 188         pkt->data[1] = hdr->pal_colors_count & 0xFF;
 189         pkt->data[2] = hdr->pal_colors_count >> 8;
 190         pkt->data[3] = hdr->video_frame_type;
 191
 192         if (get_buffer(pb, &pkt->data[4], pkt_size) != pkt_size)
 193             return AVERROR(EIO);
 194
 195         /* sound buffer will be processed on next read_packet() call */
 196         cin->audio_buffer_size = hdr->audio_frame_size;
 197         return 0;
 198     }
 199
 200     /* audio packet */
 201     if (av_new_packet(pkt, cin->audio_buffer_size))
 202         return AVERROR(ENOMEM);
 203
 204     pkt->stream_index = cin->audio_stream_index;
 205     pkt->pts = cin->audio_stream_pts;
 206     cin->audio_stream_pts += cin->audio_buffer_size * 2 / cin->file_header.audio_frame_size;
 207
 208     if (get_buffer(pb, pkt->data, cin->audio_buffer_size) != cin->audio_buffer_size)
 209         return AVERROR(EIO);
 210
 211     cin->audio_buffer_size = 0;
 212     return 0;
 213 }
 214
 215 AVInputFormat dsicin_demuxer = {
 216     "dsicin",
 217     NULL_IF_CONFIG_SMALL("Delphine Software International CIN format"),
 218     sizeof(CinDemuxContext),
 219     cin_probe,
 220     cin_read_header,
 221     cin_read_packet,
 222 };