2 * Westwood Studios VQA Format Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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
31 #include "libavutil/intreadwrite.h"
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')
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')
53 #define VQA_HEADER_SIZE 0x2A
54 #define VQA_PREAMBLE_SIZE 8
56 typedef struct WsVqaDemuxContext {
61 int audio_stream_index;
62 int video_stream_index;
65 static int wsvqa_probe(AVProbeData *p)
67 /* need 12 bytes to qualify */
71 /* check for the VQA signatures */
72 if ((AV_RB32(&p->buf[0]) != FORM_TAG) ||
73 (AV_RB32(&p->buf[8]) != WVQA_TAG))
76 return AVPROBE_SCORE_MAX;
79 static int wsvqa_read_header(AVFormatContext *s)
81 WsVqaDemuxContext *wsvqa = s->priv_data;
82 AVIOContext *pb = s->pb;
84 unsigned char *header;
85 unsigned char scratch[VQA_PREAMBLE_SIZE];
86 unsigned int chunk_tag;
87 unsigned int chunk_size;
90 /* initialize the video decoder stream */
91 st = avformat_new_stream(s, NULL);
93 return AVERROR(ENOMEM);
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 */
100 /* skip to the start of the VQA header */
101 avio_seek(pb, 20, SEEK_SET);
103 /* the VQA header needs to go to the decoder */
104 st->codec->extradata_size = VQA_HEADER_SIZE;
105 st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
106 header = (unsigned char *)st->codec->extradata;
107 if (avio_read(pb, st->codec->extradata, VQA_HEADER_SIZE) !=
111 st->codec->width = AV_RL16(&header[6]);
112 st->codec->height = AV_RL16(&header[8]);
115 st->duration = AV_RL16(&header[4]);
116 if (fps < 1 || fps > 30) {
117 av_log(s, AV_LOG_ERROR, "invalid fps: %d\n", fps);
118 return AVERROR_INVALIDDATA;
120 avpriv_set_pts_info(st, 64, 1, fps);
122 wsvqa->version = AV_RL16(&header[ 0]);
123 wsvqa->sample_rate = AV_RL16(&header[24]);
124 wsvqa->channels = header[26];
125 wsvqa->bps = header[27];
126 wsvqa->audio_stream_index = -1;
128 s->ctx_flags |= AVFMTCTX_NOHEADER;
130 /* there are 0 or more chunks before the FINF chunk; iterate until
131 * FINF has been skipped and the file will be ready to be demuxed */
133 if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
136 chunk_tag = AV_RB32(&scratch[0]);
137 chunk_size = AV_RB32(&scratch[4]);
139 /* catch any unknown header tags, for curiousity */
152 av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n",
153 scratch[0], scratch[1],
154 scratch[2], scratch[3]);
158 avio_skip(pb, chunk_size);
159 } while (chunk_tag != FINF_TAG);
164 static int wsvqa_read_packet(AVFormatContext *s,
167 WsVqaDemuxContext *wsvqa = s->priv_data;
168 AVIOContext *pb = s->pb;
170 unsigned char preamble[VQA_PREAMBLE_SIZE];
171 unsigned int chunk_type;
172 unsigned int chunk_size;
175 while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
176 chunk_type = AV_RB32(&preamble[0]);
177 chunk_size = AV_RB32(&preamble[4]);
178 skip_byte = chunk_size & 0x01;
180 if ((chunk_type == SND0_TAG) || (chunk_type == SND1_TAG) ||
181 (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
183 if (av_new_packet(pkt, chunk_size))
185 ret = avio_read(pb, pkt->data, chunk_size);
186 if (ret != chunk_size) {
187 av_packet_unref(pkt);
191 switch (chunk_type) {
195 if (wsvqa->audio_stream_index == -1) {
196 AVStream *st = avformat_new_stream(s, NULL);
198 return AVERROR(ENOMEM);
200 wsvqa->audio_stream_index = st->index;
201 if (!wsvqa->sample_rate)
202 wsvqa->sample_rate = 22050;
203 if (!wsvqa->channels)
207 st->codec->sample_rate = wsvqa->sample_rate;
208 st->codec->bits_per_coded_sample = wsvqa->bps;
209 st->codec->channels = wsvqa->channels;
210 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
212 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
214 switch (chunk_type) {
216 if (wsvqa->bps == 16)
217 st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
219 st->codec->codec_id = AV_CODEC_ID_PCM_U8;
222 st->codec->codec_id = AV_CODEC_ID_WESTWOOD_SND1;
225 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WS;
226 st->codec->extradata_size = 2;
227 st->codec->extradata = av_mallocz(2 + AV_INPUT_BUFFER_PADDING_SIZE);
228 if (!st->codec->extradata)
229 return AVERROR(ENOMEM);
230 AV_WL16(st->codec->extradata, wsvqa->version);
235 pkt->stream_index = wsvqa->audio_stream_index;
236 switch (chunk_type) {
238 /* unpacked size is stored in header */
239 pkt->duration = AV_RL16(pkt->data) / wsvqa->channels;
242 /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
243 pkt->duration = (chunk_size * 2) / wsvqa->channels;
248 pkt->stream_index = wsvqa->video_stream_index;
253 /* stay on 16-bit alignment */
263 av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type);
265 avio_skip(pb, chunk_size + skip_byte);
272 AVInputFormat ff_wsvqa_demuxer = {
274 .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA"),
275 .priv_data_size = sizeof(WsVqaDemuxContext),
276 .read_probe = wsvqa_probe,
277 .read_header = wsvqa_read_header,
278 .read_packet = wsvqa_read_packet,