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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Westwood Studios VQA Format 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 | * Westwood Studios VQA file demuxer |
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| 25 | * by Mike Melanson (melanson@pcisys.net) |
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| 26 | * for more information on the Westwood file formats, visit: |
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| 27 | * http://www.pcisys.net/~melanson/codecs/ |
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| 28 | * http://www.geocities.com/SiliconValley/8682/aud3.txt |
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| 29 | */ |
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| 30 | |||
| 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 | |||
| 35 | #define FORM_TAG MKBETAG('F', 'O', 'R', 'M') |
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| 36 | #define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A') |
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| 37 | #define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D') |
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| 38 | #define FINF_TAG MKBETAG('F', 'I', 'N', 'F') |
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| 39 | #define SND0_TAG MKBETAG('S', 'N', 'D', '0') |
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| 40 | #define SND1_TAG MKBETAG('S', 'N', 'D', '1') |
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| 41 | #define SND2_TAG MKBETAG('S', 'N', 'D', '2') |
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| 42 | #define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R') |
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| 43 | |||
| 44 | /* don't know what these tags are for, but acknowledge their existence */ |
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| 45 | #define CINF_TAG MKBETAG('C', 'I', 'N', 'F') |
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| 46 | #define CINH_TAG MKBETAG('C', 'I', 'N', 'H') |
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| 47 | #define CIND_TAG MKBETAG('C', 'I', 'N', 'D') |
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| 48 | #define PINF_TAG MKBETAG('P', 'I', 'N', 'F') |
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| 49 | #define PINH_TAG MKBETAG('P', 'I', 'N', 'H') |
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| 50 | #define PIND_TAG MKBETAG('P', 'I', 'N', 'D') |
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| 51 | #define CMDS_TAG MKBETAG('C', 'M', 'D', 'S') |
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| 52 | |||
| 53 | #define VQA_HEADER_SIZE 0x2A |
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| 54 | #define VQA_PREAMBLE_SIZE 8 |
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| 55 | |||
| 56 | typedef struct WsVqaDemuxContext { |
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| 57 | int version; |
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| 58 | int bps; |
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| 59 | int channels; |
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| 60 | int sample_rate; |
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| 61 | int audio_stream_index; |
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| 62 | int video_stream_index; |
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| 63 | } WsVqaDemuxContext; |
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| 64 | |||
| 65 | static int wsvqa_probe(AVProbeData *p) |
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| 66 | { |
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| 67 | /* need 12 bytes to qualify */ |
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| 68 | if (p->buf_size < 12) |
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| 69 | return 0; |
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| 70 | |||
| 71 | /* check for the VQA signatures */ |
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| 72 | if ((AV_RB32(&p->buf[0]) != FORM_TAG) || |
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| 73 | (AV_RB32(&p->buf[8]) != WVQA_TAG)) |
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| 74 | return 0; |
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| 75 | |||
| 76 | return AVPROBE_SCORE_MAX; |
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| 77 | } |
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| 78 | |||
| 79 | static int wsvqa_read_header(AVFormatContext *s) |
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| 80 | { |
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| 81 | WsVqaDemuxContext *wsvqa = s->priv_data; |
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| 82 | AVIOContext *pb = s->pb; |
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| 83 | AVStream *st; |
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| 84 | uint8_t *header; |
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| 85 | uint8_t scratch[VQA_PREAMBLE_SIZE]; |
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| 86 | uint32_t chunk_tag; |
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| 87 | uint32_t chunk_size; |
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| 88 | int fps; |
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| 89 | |||
| 90 | /* initialize the video decoder stream */ |
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| 91 | st = avformat_new_stream(s, NULL); |
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| 92 | if (!st) |
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| 93 | return AVERROR(ENOMEM); |
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| 94 | st->start_time = 0; |
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| 95 | wsvqa->video_stream_index = st->index; |
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| 96 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 97 | st->codec->codec_id = AV_CODEC_ID_WS_VQA; |
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| 98 | st->codec->codec_tag = 0; /* no fourcc */ |
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| 99 | |||
| 100 | /* skip to the start of the VQA header */ |
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| 101 | avio_seek(pb, 20, SEEK_SET); |
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| 102 | |||
| 103 | /* the VQA header needs to go to the decoder */ |
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| 104 | if (ff_alloc_extradata(st->codec, VQA_HEADER_SIZE)) |
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| 105 | return AVERROR(ENOMEM); |
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| 106 | header = (uint8_t *)st->codec->extradata; |
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| 107 | if (avio_read(pb, st->codec->extradata, VQA_HEADER_SIZE) != |
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| 108 | VQA_HEADER_SIZE) { |
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| 109 | return AVERROR(EIO); |
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| 110 | } |
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| 111 | st->codec->width = AV_RL16(&header[6]); |
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| 112 | st->codec->height = AV_RL16(&header[8]); |
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| 113 | fps = header[12]; |
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| 114 | st->nb_frames = |
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| 115 | st->duration = AV_RL16(&header[4]); |
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| 116 | if (fps < 1 || fps > 30) { |
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| 117 | av_log(s, AV_LOG_ERROR, "invalid fps: %d\n", fps); |
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| 118 | return AVERROR_INVALIDDATA; |
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| 119 | } |
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| 120 | avpriv_set_pts_info(st, 64, 1, fps); |
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| 121 | |||
| 122 | wsvqa->version = AV_RL16(&header[ 0]); |
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| 123 | wsvqa->sample_rate = AV_RL16(&header[24]); |
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| 124 | wsvqa->channels = header[26]; |
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| 125 | wsvqa->bps = header[27]; |
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| 126 | wsvqa->audio_stream_index = -1; |
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| 127 | |||
| 128 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
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| 129 | |||
| 130 | /* there are 0 or more chunks before the FINF chunk; iterate until |
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| 131 | * FINF has been skipped and the file will be ready to be demuxed */ |
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| 132 | do { |
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| 133 | if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) |
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| 134 | return AVERROR(EIO); |
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| 135 | chunk_tag = AV_RB32(&scratch[0]); |
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| 136 | chunk_size = AV_RB32(&scratch[4]); |
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| 137 | |||
| 138 | /* catch any unknown header tags, for curiousity */ |
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| 139 | switch (chunk_tag) { |
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| 140 | case CINF_TAG: |
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| 141 | case CINH_TAG: |
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| 142 | case CIND_TAG: |
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| 143 | case PINF_TAG: |
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| 144 | case PINH_TAG: |
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| 145 | case PIND_TAG: |
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| 146 | case FINF_TAG: |
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| 147 | case CMDS_TAG: |
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| 148 | break; |
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| 149 | |||
| 150 | default: |
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| 151 | av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n", |
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| 152 | scratch[0], scratch[1], |
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| 153 | scratch[2], scratch[3]); |
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| 154 | break; |
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| 155 | } |
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| 156 | |||
| 157 | avio_skip(pb, chunk_size); |
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| 158 | } while (chunk_tag != FINF_TAG); |
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| 159 | |||
| 160 | return 0; |
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| 161 | } |
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| 162 | |||
| 163 | static int wsvqa_read_packet(AVFormatContext *s, |
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| 164 | AVPacket *pkt) |
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| 165 | { |
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| 166 | WsVqaDemuxContext *wsvqa = s->priv_data; |
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| 167 | AVIOContext *pb = s->pb; |
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| 168 | int ret = -1; |
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| 169 | uint8_t preamble[VQA_PREAMBLE_SIZE]; |
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| 170 | uint32_t chunk_type; |
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| 171 | uint32_t chunk_size; |
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| 172 | int skip_byte; |
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| 173 | |||
| 174 | while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) { |
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| 175 | chunk_type = AV_RB32(&preamble[0]); |
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| 176 | chunk_size = AV_RB32(&preamble[4]); |
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| 177 | |||
| 178 | skip_byte = chunk_size & 0x01; |
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| 179 | |||
| 180 | if ((chunk_type == SND0_TAG) || (chunk_type == SND1_TAG) || |
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| 181 | (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) { |
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| 182 | |||
| 183 | ret= av_get_packet(pb, pkt, chunk_size); |
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| 184 | if (ret<0) |
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| 185 | return AVERROR(EIO); |
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| 186 | |||
| 187 | switch (chunk_type) { |
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| 188 | case SND0_TAG: |
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| 189 | case SND1_TAG: |
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| 190 | case SND2_TAG: |
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| 191 | if (wsvqa->audio_stream_index == -1) { |
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| 192 | AVStream *st = avformat_new_stream(s, NULL); |
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| 193 | if (!st) |
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| 194 | return AVERROR(ENOMEM); |
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| 195 | |||
| 196 | wsvqa->audio_stream_index = st->index; |
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| 197 | if (!wsvqa->sample_rate) |
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| 198 | wsvqa->sample_rate = 22050; |
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| 199 | if (!wsvqa->channels) |
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| 200 | wsvqa->channels = 1; |
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| 201 | if (!wsvqa->bps) |
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| 202 | wsvqa->bps = 8; |
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| 203 | st->codec->sample_rate = wsvqa->sample_rate; |
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| 204 | st->codec->bits_per_coded_sample = wsvqa->bps; |
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| 205 | st->codec->channels = wsvqa->channels; |
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| 206 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 207 | |||
| 208 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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| 209 | |||
| 210 | switch (chunk_type) { |
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| 211 | case SND0_TAG: |
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| 212 | if (wsvqa->bps == 16) |
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| 213 | st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; |
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| 214 | else |
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| 215 | st->codec->codec_id = AV_CODEC_ID_PCM_U8; |
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| 216 | break; |
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| 217 | case SND1_TAG: |
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| 218 | st->codec->codec_id = AV_CODEC_ID_WESTWOOD_SND1; |
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| 219 | break; |
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| 220 | case SND2_TAG: |
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| 221 | st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; |
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| 222 | if (ff_alloc_extradata(st->codec, 2)) |
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| 223 | return AVERROR(ENOMEM); |
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| 224 | AV_WL16(st->codec->extradata, wsvqa->version); |
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| 225 | break; |
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| 226 | } |
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| 227 | } |
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| 228 | |||
| 229 | pkt->stream_index = wsvqa->audio_stream_index; |
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| 230 | switch (chunk_type) { |
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| 231 | case SND1_TAG: |
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| 232 | /* unpacked size is stored in header */ |
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| 233 | if(pkt->data) |
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| 234 | pkt->duration = AV_RL16(pkt->data) / wsvqa->channels; |
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| 235 | break; |
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| 236 | case SND2_TAG: |
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| 237 | /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */ |
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| 238 | pkt->duration = (chunk_size * 2) / wsvqa->channels; |
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| 239 | break; |
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| 240 | } |
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| 241 | break; |
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| 242 | case VQFR_TAG: |
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| 243 | pkt->stream_index = wsvqa->video_stream_index; |
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| 244 | pkt->duration = 1; |
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| 245 | break; |
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| 246 | } |
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| 247 | |||
| 248 | /* stay on 16-bit alignment */ |
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| 249 | if (skip_byte) |
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| 250 | avio_skip(pb, 1); |
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| 251 | |||
| 252 | return ret; |
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| 253 | } else { |
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| 254 | switch(chunk_type){ |
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| 255 | case CMDS_TAG: |
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| 256 | break; |
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| 257 | default: |
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| 258 | av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type); |
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| 259 | } |
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| 260 | avio_skip(pb, chunk_size + skip_byte); |
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| 261 | } |
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| 262 | } |
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| 263 | |||
| 264 | return ret; |
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| 265 | } |
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| 266 | |||
| 267 | AVInputFormat ff_wsvqa_demuxer = { |
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| 268 | .name = "wsvqa", |
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| 269 | .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA"), |
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| 270 | .priv_data_size = sizeof(WsVqaDemuxContext), |
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| 271 | .read_probe = wsvqa_probe, |
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| 272 | .read_header = wsvqa_read_header, |
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| 273 | .read_packet = wsvqa_read_packet, |
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| 274 | }; |