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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * id RoQ (.roq) File Demuxer |
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| 3 | * Copyright (c) 2003 The ffmpeg Project |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * id RoQ format file demuxer |
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| 25 | * by Mike Melanson (melanson@pcisys.net) |
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| 26 | * for more information on the .roq file format, visit: |
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| 27 | * http://www.csse.monash.edu.au/~timf/ |
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| 28 | */ |
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| 29 | |||
| 30 | #include "libavutil/channel_layout.h" |
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| 31 | #include "libavutil/intreadwrite.h" |
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| 32 | #include "avformat.h" |
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| 33 | #include "internal.h" |
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| 34 | #include "avio_internal.h" |
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| 35 | |||
| 36 | #define RoQ_MAGIC_NUMBER 0x1084 |
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| 37 | #define RoQ_CHUNK_PREAMBLE_SIZE 8 |
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| 38 | #define RoQ_AUDIO_SAMPLE_RATE 22050 |
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| 39 | #define RoQ_CHUNKS_TO_SCAN 30 |
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| 40 | |||
| 41 | #define RoQ_INFO 0x1001 |
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| 42 | #define RoQ_QUAD_CODEBOOK 0x1002 |
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| 43 | #define RoQ_QUAD_VQ 0x1011 |
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| 44 | #define RoQ_SOUND_MONO 0x1020 |
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| 45 | #define RoQ_SOUND_STEREO 0x1021 |
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| 46 | |||
| 47 | typedef struct RoqDemuxContext { |
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| 48 | |||
| 49 | int frame_rate; |
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| 50 | int width; |
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| 51 | int height; |
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| 52 | int audio_channels; |
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| 53 | |||
| 54 | int video_stream_index; |
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| 55 | int audio_stream_index; |
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| 56 | |||
| 57 | int64_t video_pts; |
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| 58 | unsigned int audio_frame_count; |
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| 59 | |||
| 60 | } RoqDemuxContext; |
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| 61 | |||
| 62 | static int roq_probe(AVProbeData *p) |
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| 63 | { |
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| 64 | if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) || |
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| 65 | (AV_RL32(&p->buf[2]) != 0xFFFFFFFF)) |
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| 66 | return 0; |
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| 67 | |||
| 68 | return AVPROBE_SCORE_MAX; |
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| 69 | } |
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| 70 | |||
| 71 | static int roq_read_header(AVFormatContext *s) |
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| 72 | { |
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| 73 | RoqDemuxContext *roq = s->priv_data; |
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| 74 | AVIOContext *pb = s->pb; |
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| 75 | unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE]; |
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| 76 | |||
| 77 | /* get the main header */ |
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| 78 | if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != |
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| 79 | RoQ_CHUNK_PREAMBLE_SIZE) |
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| 80 | return AVERROR(EIO); |
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| 81 | roq->frame_rate = AV_RL16(&preamble[6]); |
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| 82 | |||
| 83 | /* init private context parameters */ |
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| 84 | roq->width = roq->height = roq->audio_channels = roq->video_pts = |
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| 85 | roq->audio_frame_count = 0; |
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| 86 | roq->audio_stream_index = -1; |
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| 87 | roq->video_stream_index = -1; |
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| 88 | |||
| 89 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
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| 90 | |||
| 91 | return 0; |
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| 92 | } |
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| 93 | |||
| 94 | static int roq_read_packet(AVFormatContext *s, |
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| 95 | AVPacket *pkt) |
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| 96 | { |
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| 97 | RoqDemuxContext *roq = s->priv_data; |
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| 98 | AVIOContext *pb = s->pb; |
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| 99 | int ret = 0; |
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| 100 | unsigned int chunk_size; |
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| 101 | unsigned int chunk_type; |
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| 102 | unsigned int codebook_size; |
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| 103 | unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE]; |
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| 104 | int packet_read = 0; |
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| 105 | int64_t codebook_offset; |
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| 106 | |||
| 107 | while (!packet_read) { |
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| 108 | |||
| 109 | if (url_feof(s->pb)) |
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| 110 | return AVERROR(EIO); |
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| 111 | |||
| 112 | /* get the next chunk preamble */ |
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| 113 | if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) != |
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| 114 | RoQ_CHUNK_PREAMBLE_SIZE) |
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| 115 | return AVERROR(EIO); |
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| 116 | |||
| 117 | chunk_type = AV_RL16(&preamble[0]); |
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| 118 | chunk_size = AV_RL32(&preamble[2]); |
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| 119 | if(chunk_size > INT_MAX) |
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| 120 | return AVERROR_INVALIDDATA; |
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| 121 | |||
| 122 | chunk_size = ffio_limit(pb, chunk_size); |
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| 123 | |||
| 124 | switch (chunk_type) { |
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| 125 | |||
| 126 | case RoQ_INFO: |
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| 127 | if (roq->video_stream_index == -1) { |
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| 128 | AVStream *st = avformat_new_stream(s, NULL); |
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| 129 | if (!st) |
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| 130 | return AVERROR(ENOMEM); |
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| 131 | avpriv_set_pts_info(st, 63, 1, roq->frame_rate); |
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| 132 | roq->video_stream_index = st->index; |
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| 133 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 134 | st->codec->codec_id = AV_CODEC_ID_ROQ; |
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| 135 | st->codec->codec_tag = 0; /* no fourcc */ |
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| 136 | |||
| 137 | if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE) |
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| 138 | return AVERROR(EIO); |
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| 139 | st->codec->width = roq->width = AV_RL16(preamble); |
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| 140 | st->codec->height = roq->height = AV_RL16(preamble + 2); |
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| 141 | break; |
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| 142 | } |
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| 143 | /* don't care about this chunk anymore */ |
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| 144 | avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE); |
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| 145 | break; |
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| 146 | |||
| 147 | case RoQ_QUAD_CODEBOOK: |
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| 148 | if (roq->video_stream_index < 0) |
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| 149 | return AVERROR_INVALIDDATA; |
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| 150 | /* packet needs to contain both this codebook and next VQ chunk */ |
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| 151 | codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE; |
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| 152 | codebook_size = chunk_size; |
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| 153 | avio_skip(pb, codebook_size); |
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| 154 | if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != |
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| 155 | RoQ_CHUNK_PREAMBLE_SIZE) |
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| 156 | return AVERROR(EIO); |
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| 157 | chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 + |
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| 158 | codebook_size; |
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| 159 | |||
| 160 | /* rewind */ |
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| 161 | avio_seek(pb, codebook_offset, SEEK_SET); |
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| 162 | |||
| 163 | /* load up the packet */ |
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| 164 | ret= av_get_packet(pb, pkt, chunk_size); |
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| 165 | if (ret != chunk_size) |
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| 166 | return AVERROR(EIO); |
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| 167 | pkt->stream_index = roq->video_stream_index; |
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| 168 | pkt->pts = roq->video_pts++; |
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| 169 | |||
| 170 | packet_read = 1; |
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| 171 | break; |
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| 172 | |||
| 173 | case RoQ_SOUND_MONO: |
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| 174 | case RoQ_SOUND_STEREO: |
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| 175 | if (roq->audio_stream_index == -1) { |
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| 176 | AVStream *st = avformat_new_stream(s, NULL); |
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| 177 | if (!st) |
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| 178 | return AVERROR(ENOMEM); |
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| 179 | avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE); |
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| 180 | roq->audio_stream_index = st->index; |
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| 181 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 182 | st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM; |
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| 183 | st->codec->codec_tag = 0; /* no tag */ |
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| 184 | if (chunk_type == RoQ_SOUND_STEREO) { |
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| 185 | st->codec->channels = 2; |
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| 186 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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| 187 | } else { |
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| 188 | st->codec->channels = 1; |
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| 189 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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| 190 | } |
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| 191 | roq->audio_channels = st->codec->channels; |
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| 192 | st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE; |
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| 193 | st->codec->bits_per_coded_sample = 16; |
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| 194 | st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
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| 195 | st->codec->bits_per_coded_sample; |
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| 196 | st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; |
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| 197 | } |
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| 198 | case RoQ_QUAD_VQ: |
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| 199 | if (chunk_type == RoQ_QUAD_VQ) { |
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| 200 | if (roq->video_stream_index < 0) |
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| 201 | return AVERROR_INVALIDDATA; |
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| 202 | } |
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| 203 | |||
| 204 | /* load up the packet */ |
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| 205 | if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE)) |
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| 206 | return AVERROR(EIO); |
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| 207 | /* copy over preamble */ |
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| 208 | memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE); |
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| 209 | |||
| 210 | if (chunk_type == RoQ_QUAD_VQ) { |
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| 211 | pkt->stream_index = roq->video_stream_index; |
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| 212 | pkt->pts = roq->video_pts++; |
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| 213 | } else { |
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| 214 | pkt->stream_index = roq->audio_stream_index; |
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| 215 | pkt->pts = roq->audio_frame_count; |
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| 216 | roq->audio_frame_count += (chunk_size / roq->audio_channels); |
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| 217 | } |
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| 218 | |||
| 219 | pkt->pos= avio_tell(pb); |
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| 220 | ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE, |
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| 221 | chunk_size); |
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| 222 | if (ret != chunk_size) |
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| 223 | ret = AVERROR(EIO); |
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| 224 | |||
| 225 | packet_read = 1; |
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| 226 | break; |
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| 227 | |||
| 228 | default: |
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| 229 | av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type); |
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| 230 | return AVERROR_INVALIDDATA; |
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| 231 | } |
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| 232 | } |
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| 233 | |||
| 234 | return ret; |
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| 235 | } |
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| 236 | |||
| 237 | AVInputFormat ff_roq_demuxer = { |
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| 238 | .name = "roq", |
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| 239 | .long_name = NULL_IF_CONFIG_SMALL("id RoQ"), |
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| 240 | .priv_data_size = sizeof(RoqDemuxContext), |
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| 241 | .read_probe = roq_probe, |
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| 242 | .read_header = roq_read_header, |
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| 243 | .read_packet = roq_read_packet, |
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| 244 | }; |