| 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 |
| 24 | * Delphine Software International CIN file demuxer |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/channel_layout.h" |
| 28 | #include "libavutil/intreadwrite.h" |
| 29 | #include "avformat.h" |
| 30 | #include "internal.h" |
| 31 | #include "avio_internal.h" |
| 32 | |
| 33 | |
| 34 | typedef struct CinFileHeader { |
| 35 | int video_frame_size; |
| 36 | int video_frame_width; |
| 37 | int video_frame_height; |
| 38 | int audio_frequency; |
| 39 | int audio_bits; |
| 40 | int audio_stereo; |
| 41 | int audio_frame_size; |
| 42 | } CinFileHeader; |
| 43 | |
| 44 | typedef struct CinFrameHeader { |
| 45 | int audio_frame_type; |
| 46 | int video_frame_type; |
| 47 | int pal_colors_count; |
| 48 | int audio_frame_size; |
| 49 | int video_frame_size; |
| 50 | } CinFrameHeader; |
| 51 | |
| 52 | typedef struct CinDemuxContext { |
| 53 | int audio_stream_index; |
| 54 | int video_stream_index; |
| 55 | CinFileHeader file_header; |
| 56 | int64_t audio_stream_pts; |
| 57 | int64_t video_stream_pts; |
| 58 | CinFrameHeader frame_header; |
| 59 | int audio_buffer_size; |
| 60 | } CinDemuxContext; |
| 61 | |
| 62 | |
| 63 | static int cin_probe(AVProbeData *p) |
| 64 | { |
| 65 | /* header starts with this special marker */ |
| 66 | if (AV_RL32(&p->buf[0]) != 0x55AA0000) |
| 67 | return 0; |
| 68 | |
| 69 | /* for accuracy, check some header field values */ |
| 70 | if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0) |
| 71 | return 0; |
| 72 | |
| 73 | return AVPROBE_SCORE_MAX; |
| 74 | } |
| 75 | |
| 76 | static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) { |
| 77 | CinFileHeader *hdr = &cin->file_header; |
| 78 | |
| 79 | if (avio_rl32(pb) != 0x55AA0000) |
| 80 | return AVERROR_INVALIDDATA; |
| 81 | |
| 82 | hdr->video_frame_size = avio_rl32(pb); |
| 83 | hdr->video_frame_width = avio_rl16(pb); |
| 84 | hdr->video_frame_height = avio_rl16(pb); |
| 85 | hdr->audio_frequency = avio_rl32(pb); |
| 86 | hdr->audio_bits = avio_r8(pb); |
| 87 | hdr->audio_stereo = avio_r8(pb); |
| 88 | hdr->audio_frame_size = avio_rl16(pb); |
| 89 | |
| 90 | if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0) |
| 91 | return AVERROR_INVALIDDATA; |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static int cin_read_header(AVFormatContext *s) |
| 97 | { |
| 98 | int rc; |
| 99 | CinDemuxContext *cin = s->priv_data; |
| 100 | CinFileHeader *hdr = &cin->file_header; |
| 101 | AVIOContext *pb = s->pb; |
| 102 | AVStream *st; |
| 103 | |
| 104 | rc = cin_read_file_header(cin, pb); |
| 105 | if (rc) |
| 106 | return rc; |
| 107 | |
| 108 | cin->video_stream_pts = 0; |
| 109 | cin->audio_stream_pts = 0; |
| 110 | cin->audio_buffer_size = 0; |
| 111 | |
| 112 | /* initialize the video decoder stream */ |
| 113 | st = avformat_new_stream(s, NULL); |
| 114 | if (!st) |
| 115 | return AVERROR(ENOMEM); |
| 116 | |
| 117 | avpriv_set_pts_info(st, 32, 1, 12); |
| 118 | cin->video_stream_index = st->index; |
| 119 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 120 | st->codec->codec_id = AV_CODEC_ID_DSICINVIDEO; |
| 121 | st->codec->codec_tag = 0; /* no fourcc */ |
| 122 | st->codec->width = hdr->video_frame_width; |
| 123 | st->codec->height = hdr->video_frame_height; |
| 124 | |
| 125 | /* initialize the audio decoder stream */ |
| 126 | st = avformat_new_stream(s, NULL); |
| 127 | if (!st) |
| 128 | return AVERROR(ENOMEM); |
| 129 | |
| 130 | avpriv_set_pts_info(st, 32, 1, 22050); |
| 131 | cin->audio_stream_index = st->index; |
| 132 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 133 | st->codec->codec_id = AV_CODEC_ID_DSICINAUDIO; |
| 134 | st->codec->codec_tag = 0; /* no tag */ |
| 135 | st->codec->channels = 1; |
| 136 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| 137 | st->codec->sample_rate = 22050; |
| 138 | st->codec->bits_per_coded_sample = 8; |
| 139 | st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels; |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) { |
| 145 | CinFrameHeader *hdr = &cin->frame_header; |
| 146 | |
| 147 | hdr->video_frame_type = avio_r8(pb); |
| 148 | hdr->audio_frame_type = avio_r8(pb); |
| 149 | hdr->pal_colors_count = avio_rl16(pb); |
| 150 | hdr->video_frame_size = avio_rl32(pb); |
| 151 | hdr->audio_frame_size = avio_rl32(pb); |
| 152 | |
| 153 | if (avio_feof(pb) || pb->error) |
| 154 | return AVERROR(EIO); |
| 155 | |
| 156 | if (avio_rl32(pb) != 0xAA55AA55) |
| 157 | return AVERROR_INVALIDDATA; |
| 158 | if (hdr->video_frame_size < 0 || hdr->audio_frame_size < 0) |
| 159 | return AVERROR_INVALIDDATA; |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int cin_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 165 | { |
| 166 | CinDemuxContext *cin = s->priv_data; |
| 167 | AVIOContext *pb = s->pb; |
| 168 | CinFrameHeader *hdr = &cin->frame_header; |
| 169 | int rc, palette_type, pkt_size; |
| 170 | int ret; |
| 171 | |
| 172 | if (cin->audio_buffer_size == 0) { |
| 173 | rc = cin_read_frame_header(cin, pb); |
| 174 | if (rc) |
| 175 | return rc; |
| 176 | |
| 177 | if ((int16_t)hdr->pal_colors_count < 0) { |
| 178 | hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count; |
| 179 | palette_type = 1; |
| 180 | } else { |
| 181 | palette_type = 0; |
| 182 | } |
| 183 | |
| 184 | /* palette and video packet */ |
| 185 | pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size; |
| 186 | |
| 187 | pkt_size = ffio_limit(pb, pkt_size); |
| 188 | |
| 189 | ret = av_new_packet(pkt, 4 + pkt_size); |
| 190 | if (ret < 0) |
| 191 | return ret; |
| 192 | |
| 193 | pkt->stream_index = cin->video_stream_index; |
| 194 | pkt->pts = cin->video_stream_pts++; |
| 195 | |
| 196 | pkt->data[0] = palette_type; |
| 197 | pkt->data[1] = hdr->pal_colors_count & 0xFF; |
| 198 | pkt->data[2] = hdr->pal_colors_count >> 8; |
| 199 | pkt->data[3] = hdr->video_frame_type; |
| 200 | |
| 201 | ret = avio_read(pb, &pkt->data[4], pkt_size); |
| 202 | if (ret < 0) { |
| 203 | av_free_packet(pkt); |
| 204 | return ret; |
| 205 | } |
| 206 | if (ret < pkt_size) |
| 207 | av_shrink_packet(pkt, 4 + ret); |
| 208 | |
| 209 | /* sound buffer will be processed on next read_packet() call */ |
| 210 | cin->audio_buffer_size = hdr->audio_frame_size; |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | /* audio packet */ |
| 215 | ret = av_get_packet(pb, pkt, cin->audio_buffer_size); |
| 216 | if (ret < 0) |
| 217 | return ret; |
| 218 | |
| 219 | pkt->stream_index = cin->audio_stream_index; |
| 220 | pkt->pts = cin->audio_stream_pts; |
| 221 | pkt->duration = cin->audio_buffer_size - (pkt->pts == 0); |
| 222 | cin->audio_stream_pts += pkt->duration; |
| 223 | cin->audio_buffer_size = 0; |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | AVInputFormat ff_dsicin_demuxer = { |
| 228 | .name = "dsicin", |
| 229 | .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"), |
| 230 | .priv_data_size = sizeof(CinDemuxContext), |
| 231 | .read_probe = cin_probe, |
| 232 | .read_header = cin_read_header, |
| 233 | .read_packet = cin_read_packet, |
| 234 | }; |