| 1 | /* |
| 2 | * Westwood Studios VQA Format Demuxer |
| 3 | * Copyright (c) 2003 The FFmpeg Project |
| 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 | * Westwood Studios VQA file demuxer |
| 25 | * by Mike Melanson (melanson@pcisys.net) |
| 26 | * for more information on the Westwood file formats, visit: |
| 27 | * http://www.pcisys.net/~melanson/codecs/ |
| 28 | * http://www.geocities.com/SiliconValley/8682/aud3.txt |
| 29 | */ |
| 30 | |
| 31 | #include "libavutil/intreadwrite.h" |
| 32 | #include "avformat.h" |
| 33 | #include "internal.h" |
| 34 | |
| 35 | #define FORM_TAG MKBETAG('F', 'O', 'R', 'M') |
| 36 | #define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A') |
| 37 | #define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D') |
| 38 | #define FINF_TAG MKBETAG('F', 'I', 'N', 'F') |
| 39 | #define SND0_TAG MKBETAG('S', 'N', 'D', '0') |
| 40 | #define SND1_TAG MKBETAG('S', 'N', 'D', '1') |
| 41 | #define SND2_TAG MKBETAG('S', 'N', 'D', '2') |
| 42 | #define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R') |
| 43 | |
| 44 | /* don't know what these tags are for, but acknowledge their existence */ |
| 45 | #define CINF_TAG MKBETAG('C', 'I', 'N', 'F') |
| 46 | #define CINH_TAG MKBETAG('C', 'I', 'N', 'H') |
| 47 | #define CIND_TAG MKBETAG('C', 'I', 'N', 'D') |
| 48 | #define PINF_TAG MKBETAG('P', 'I', 'N', 'F') |
| 49 | #define PINH_TAG MKBETAG('P', 'I', 'N', 'H') |
| 50 | #define PIND_TAG MKBETAG('P', 'I', 'N', 'D') |
| 51 | #define CMDS_TAG MKBETAG('C', 'M', 'D', 'S') |
| 52 | |
| 53 | #define VQA_HEADER_SIZE 0x2A |
| 54 | #define VQA_PREAMBLE_SIZE 8 |
| 55 | |
| 56 | typedef struct WsVqaDemuxContext { |
| 57 | int version; |
| 58 | int bps; |
| 59 | int channels; |
| 60 | int sample_rate; |
| 61 | int audio_stream_index; |
| 62 | int video_stream_index; |
| 63 | } WsVqaDemuxContext; |
| 64 | |
| 65 | static int wsvqa_probe(AVProbeData *p) |
| 66 | { |
| 67 | /* need 12 bytes to qualify */ |
| 68 | if (p->buf_size < 12) |
| 69 | return 0; |
| 70 | |
| 71 | /* check for the VQA signatures */ |
| 72 | if ((AV_RB32(&p->buf[0]) != FORM_TAG) || |
| 73 | (AV_RB32(&p->buf[8]) != WVQA_TAG)) |
| 74 | return 0; |
| 75 | |
| 76 | return AVPROBE_SCORE_MAX; |
| 77 | } |
| 78 | |
| 79 | static int wsvqa_read_header(AVFormatContext *s) |
| 80 | { |
| 81 | WsVqaDemuxContext *wsvqa = s->priv_data; |
| 82 | AVIOContext *pb = s->pb; |
| 83 | AVStream *st; |
| 84 | uint8_t *header; |
| 85 | uint8_t scratch[VQA_PREAMBLE_SIZE]; |
| 86 | uint32_t chunk_tag; |
| 87 | uint32_t chunk_size; |
| 88 | int fps; |
| 89 | |
| 90 | /* initialize the video decoder stream */ |
| 91 | st = avformat_new_stream(s, NULL); |
| 92 | if (!st) |
| 93 | return AVERROR(ENOMEM); |
| 94 | st->start_time = 0; |
| 95 | wsvqa->video_stream_index = st->index; |
| 96 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 97 | st->codec->codec_id = AV_CODEC_ID_WS_VQA; |
| 98 | st->codec->codec_tag = 0; /* no fourcc */ |
| 99 | |
| 100 | /* skip to the start of the VQA header */ |
| 101 | avio_seek(pb, 20, SEEK_SET); |
| 102 | |
| 103 | /* the VQA header needs to go to the decoder */ |
| 104 | if (ff_get_extradata(st->codec, pb, VQA_HEADER_SIZE) < 0) |
| 105 | return AVERROR(ENOMEM); |
| 106 | header = (uint8_t *)st->codec->extradata; |
| 107 | st->codec->width = AV_RL16(&header[6]); |
| 108 | st->codec->height = AV_RL16(&header[8]); |
| 109 | fps = header[12]; |
| 110 | st->nb_frames = |
| 111 | st->duration = AV_RL16(&header[4]); |
| 112 | if (fps < 1 || fps > 30) { |
| 113 | av_log(s, AV_LOG_ERROR, "invalid fps: %d\n", fps); |
| 114 | return AVERROR_INVALIDDATA; |
| 115 | } |
| 116 | avpriv_set_pts_info(st, 64, 1, fps); |
| 117 | |
| 118 | wsvqa->version = AV_RL16(&header[ 0]); |
| 119 | wsvqa->sample_rate = AV_RL16(&header[24]); |
| 120 | wsvqa->channels = header[26]; |
| 121 | wsvqa->bps = header[27]; |
| 122 | wsvqa->audio_stream_index = -1; |
| 123 | |
| 124 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
| 125 | |
| 126 | /* there are 0 or more chunks before the FINF chunk; iterate until |
| 127 | * FINF has been skipped and the file will be ready to be demuxed */ |
| 128 | do { |
| 129 | if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) |
| 130 | return AVERROR(EIO); |
| 131 | chunk_tag = AV_RB32(&scratch[0]); |
| 132 | chunk_size = AV_RB32(&scratch[4]); |
| 133 | |
| 134 | /* catch any unknown header tags, for curiousity */ |
| 135 | switch (chunk_tag) { |
| 136 | case CINF_TAG: |
| 137 | case CINH_TAG: |
| 138 | case CIND_TAG: |
| 139 | case PINF_TAG: |
| 140 | case PINH_TAG: |
| 141 | case PIND_TAG: |
| 142 | case FINF_TAG: |
| 143 | case CMDS_TAG: |
| 144 | break; |
| 145 | |
| 146 | default: |
| 147 | av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n", |
| 148 | scratch[0], scratch[1], |
| 149 | scratch[2], scratch[3]); |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | avio_skip(pb, chunk_size); |
| 154 | } while (chunk_tag != FINF_TAG); |
| 155 | |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | static int wsvqa_read_packet(AVFormatContext *s, |
| 160 | AVPacket *pkt) |
| 161 | { |
| 162 | WsVqaDemuxContext *wsvqa = s->priv_data; |
| 163 | AVIOContext *pb = s->pb; |
| 164 | int ret = -1; |
| 165 | uint8_t preamble[VQA_PREAMBLE_SIZE]; |
| 166 | uint32_t chunk_type; |
| 167 | uint32_t chunk_size; |
| 168 | int skip_byte; |
| 169 | |
| 170 | while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) { |
| 171 | chunk_type = AV_RB32(&preamble[0]); |
| 172 | chunk_size = AV_RB32(&preamble[4]); |
| 173 | |
| 174 | skip_byte = chunk_size & 0x01; |
| 175 | |
| 176 | if ((chunk_type == SND0_TAG) || (chunk_type == SND1_TAG) || |
| 177 | (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) { |
| 178 | |
| 179 | ret= av_get_packet(pb, pkt, chunk_size); |
| 180 | if (ret<0) |
| 181 | return AVERROR(EIO); |
| 182 | |
| 183 | switch (chunk_type) { |
| 184 | case SND0_TAG: |
| 185 | case SND1_TAG: |
| 186 | case SND2_TAG: |
| 187 | if (wsvqa->audio_stream_index == -1) { |
| 188 | AVStream *st = avformat_new_stream(s, NULL); |
| 189 | if (!st) |
| 190 | return AVERROR(ENOMEM); |
| 191 | |
| 192 | wsvqa->audio_stream_index = st->index; |
| 193 | if (!wsvqa->sample_rate) |
| 194 | wsvqa->sample_rate = 22050; |
| 195 | if (!wsvqa->channels) |
| 196 | wsvqa->channels = 1; |
| 197 | if (!wsvqa->bps) |
| 198 | wsvqa->bps = 8; |
| 199 | st->codec->sample_rate = wsvqa->sample_rate; |
| 200 | st->codec->bits_per_coded_sample = wsvqa->bps; |
| 201 | st->codec->channels = wsvqa->channels; |
| 202 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 203 | |
| 204 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| 205 | |
| 206 | switch (chunk_type) { |
| 207 | case SND0_TAG: |
| 208 | if (wsvqa->bps == 16) |
| 209 | st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; |
| 210 | else |
| 211 | st->codec->codec_id = AV_CODEC_ID_PCM_U8; |
| 212 | break; |
| 213 | case SND1_TAG: |
| 214 | st->codec->codec_id = AV_CODEC_ID_WESTWOOD_SND1; |
| 215 | break; |
| 216 | case SND2_TAG: |
| 217 | st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; |
| 218 | if (ff_alloc_extradata(st->codec, 2)) |
| 219 | return AVERROR(ENOMEM); |
| 220 | AV_WL16(st->codec->extradata, wsvqa->version); |
| 221 | break; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | pkt->stream_index = wsvqa->audio_stream_index; |
| 226 | switch (chunk_type) { |
| 227 | case SND1_TAG: |
| 228 | /* unpacked size is stored in header */ |
| 229 | if(pkt->data) |
| 230 | pkt->duration = AV_RL16(pkt->data) / wsvqa->channels; |
| 231 | break; |
| 232 | case SND2_TAG: |
| 233 | /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */ |
| 234 | pkt->duration = (chunk_size * 2) / wsvqa->channels; |
| 235 | break; |
| 236 | } |
| 237 | break; |
| 238 | case VQFR_TAG: |
| 239 | pkt->stream_index = wsvqa->video_stream_index; |
| 240 | pkt->duration = 1; |
| 241 | break; |
| 242 | } |
| 243 | |
| 244 | /* stay on 16-bit alignment */ |
| 245 | if (skip_byte) |
| 246 | avio_skip(pb, 1); |
| 247 | |
| 248 | return ret; |
| 249 | } else { |
| 250 | switch(chunk_type){ |
| 251 | case CMDS_TAG: |
| 252 | break; |
| 253 | default: |
| 254 | av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type); |
| 255 | } |
| 256 | avio_skip(pb, chunk_size + skip_byte); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | AVInputFormat ff_wsvqa_demuxer = { |
| 264 | .name = "wsvqa", |
| 265 | .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA"), |
| 266 | .priv_data_size = sizeof(WsVqaDemuxContext), |
| 267 | .read_probe = wsvqa_probe, |
| 268 | .read_header = wsvqa_read_header, |
| 269 | .read_packet = wsvqa_read_packet, |
| 270 | }; |