summaryrefslogtreecommitdiff
path: root/libavformat/westwood_vqa.c (plain)
blob: efb9847ff09129aca4dd48750470530ca527c6fe
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
56typedef 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
65static 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
79static 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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
97 st->codecpar->codec_id = AV_CODEC_ID_WS_VQA;
98 st->codecpar->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(s, st->codecpar, pb, VQA_HEADER_SIZE) < 0)
105 return AVERROR(ENOMEM);
106 header = st->codecpar->extradata;
107 st->codecpar->width = AV_RL16(&header[6]);
108 st->codecpar->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 curiosity */
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 (%s)\n",
148 av_fourcc2str(chunk_tag));
149 break;
150 }
151
152 avio_skip(pb, chunk_size);
153 } while (chunk_tag != FINF_TAG);
154
155 return 0;
156}
157
158static int wsvqa_read_packet(AVFormatContext *s,
159 AVPacket *pkt)
160{
161 WsVqaDemuxContext *wsvqa = s->priv_data;
162 AVIOContext *pb = s->pb;
163 int ret = -1;
164 uint8_t preamble[VQA_PREAMBLE_SIZE];
165 uint32_t chunk_type;
166 uint32_t chunk_size;
167 int skip_byte;
168
169 while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
170 chunk_type = AV_RB32(&preamble[0]);
171 chunk_size = AV_RB32(&preamble[4]);
172
173 skip_byte = chunk_size & 0x01;
174
175 if ((chunk_type == SND0_TAG) || (chunk_type == SND1_TAG) ||
176 (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
177
178 ret= av_get_packet(pb, pkt, chunk_size);
179 if (ret<0)
180 return AVERROR(EIO);
181
182 switch (chunk_type) {
183 case SND0_TAG:
184 case SND1_TAG:
185 case SND2_TAG:
186 if (wsvqa->audio_stream_index == -1) {
187 AVStream *st = avformat_new_stream(s, NULL);
188 if (!st)
189 return AVERROR(ENOMEM);
190
191 wsvqa->audio_stream_index = st->index;
192 if (!wsvqa->sample_rate)
193 wsvqa->sample_rate = 22050;
194 if (!wsvqa->channels)
195 wsvqa->channels = 1;
196 if (!wsvqa->bps)
197 wsvqa->bps = 8;
198 st->codecpar->sample_rate = wsvqa->sample_rate;
199 st->codecpar->bits_per_coded_sample = wsvqa->bps;
200 st->codecpar->channels = wsvqa->channels;
201 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
202
203 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
204
205 switch (chunk_type) {
206 case SND0_TAG:
207 if (wsvqa->bps == 16)
208 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
209 else
210 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
211 break;
212 case SND1_TAG:
213 st->codecpar->codec_id = AV_CODEC_ID_WESTWOOD_SND1;
214 break;
215 case SND2_TAG:
216 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS;
217 if (ff_alloc_extradata(st->codecpar, 2))
218 return AVERROR(ENOMEM);
219 AV_WL16(st->codecpar->extradata, wsvqa->version);
220 break;
221 }
222 }
223
224 pkt->stream_index = wsvqa->audio_stream_index;
225 switch (chunk_type) {
226 case SND1_TAG:
227 /* unpacked size is stored in header */
228 if(pkt->data)
229 pkt->duration = AV_RL16(pkt->data) / wsvqa->channels;
230 break;
231 case SND2_TAG:
232 /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
233 pkt->duration = (chunk_size * 2) / wsvqa->channels;
234 break;
235 }
236 break;
237 case VQFR_TAG:
238 pkt->stream_index = wsvqa->video_stream_index;
239 pkt->duration = 1;
240 break;
241 }
242
243 /* stay on 16-bit alignment */
244 if (skip_byte)
245 avio_skip(pb, 1);
246
247 return ret;
248 } else {
249 switch(chunk_type){
250 case CMDS_TAG:
251 break;
252 default:
253 av_log(s, AV_LOG_INFO, "Skipping unknown chunk %s\n",
254 av_fourcc2str(av_bswap32(chunk_type)));
255 }
256 avio_skip(pb, chunk_size + skip_byte);
257 }
258 }
259
260 return ret;
261}
262
263AVInputFormat 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};
271
generated by cgit at 2024-05-17 06:09:51 (GMT)