vqa: use 1/sample_rate as the audio stream time base
[libav.git] / libavformat / westwood_vqa.c
CommitLineData
2fdf638b 1/*
e924a4ba 2 * Westwood Studios VQA Format Demuxer
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3 * Copyright (c) 2003 The ffmpeg Project
4 *
2912e87a 5 * This file is part of Libav.
b78e7197 6 *
2912e87a 7 * Libav 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
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
2fdf638b 11 *
2912e87a 12 * Libav 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
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
2912e87a 18 * License along with Libav; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
21
22/**
ba87f080 23 * @file
e924a4ba 24 * Westwood Studios VQA file demuxer
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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
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29 */
30
6a5d31ac 31#include "libavutil/intreadwrite.h"
2fdf638b 32#include "avformat.h"
c3f9ebf7 33#include "internal.h"
2fdf638b 34
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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')
61710f7b 40#define SND1_TAG MKBETAG('S', 'N', 'D', '1')
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41#define SND2_TAG MKBETAG('S', 'N', 'D', '2')
42#define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R')
2fdf638b 43
20f269dc 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')
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')
61710f7b 51#define CMDS_TAG MKBETAG('C', 'M', 'D', 'S')
20f269dc 52
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53#define VQA_HEADER_SIZE 0x2A
54#define VQA_FRAMERATE 15
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55#define VQA_PREAMBLE_SIZE 8
56
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57typedef struct WsVqaDemuxContext {
58 int audio_samplerate;
59 int audio_channels;
60 int audio_bits;
61
62 int audio_stream_index;
63 int video_stream_index;
64
65 int64_t audio_frame_counter;
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66} WsVqaDemuxContext;
67
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68static int wsvqa_probe(AVProbeData *p)
69{
70 /* need 12 bytes to qualify */
71 if (p->buf_size < 12)
72 return 0;
73
74 /* check for the VQA signatures */
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75 if ((AV_RB32(&p->buf[0]) != FORM_TAG) ||
76 (AV_RB32(&p->buf[8]) != WVQA_TAG))
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77 return 0;
78
79 return AVPROBE_SCORE_MAX;
80}
81
82static int wsvqa_read_header(AVFormatContext *s,
83 AVFormatParameters *ap)
84{
e4141433 85 WsVqaDemuxContext *wsvqa = s->priv_data;
ae628ec1 86 AVIOContext *pb = s->pb;
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87 AVStream *st;
88 unsigned char *header;
89 unsigned char scratch[VQA_PREAMBLE_SIZE];
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90 unsigned int chunk_tag;
91 unsigned int chunk_size;
2fdf638b 92
2fdf638b 93 /* initialize the video decoder stream */
3b3bbdd3 94 st = avformat_new_stream(s, NULL);
2fdf638b 95 if (!st)
769e10f0 96 return AVERROR(ENOMEM);
e1ac69fa 97 st->start_time = 0;
c3f9ebf7 98 avpriv_set_pts_info(st, 33, 1, VQA_FRAMERATE);
2fdf638b 99 wsvqa->video_stream_index = st->index;
72415b2a 100 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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101 st->codec->codec_id = CODEC_ID_WS_VQA;
102 st->codec->codec_tag = 0; /* no fourcc */
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103
104 /* skip to the start of the VQA header */
6b4aa5da 105 avio_seek(pb, 20, SEEK_SET);
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106
107 /* the VQA header needs to go to the decoder */
01f4895c 108 st->codec->extradata_size = VQA_HEADER_SIZE;
d76319b1 109 st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
01f4895c 110 header = (unsigned char *)st->codec->extradata;
b7effd4e 111 if (avio_read(pb, st->codec->extradata, VQA_HEADER_SIZE) !=
2fdf638b 112 VQA_HEADER_SIZE) {
01f4895c 113 av_free(st->codec->extradata);
6f3e0b21 114 return AVERROR(EIO);
2fdf638b 115 }
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116 st->codec->width = AV_RL16(&header[6]);
117 st->codec->height = AV_RL16(&header[8]);
2fdf638b 118
61710f7b 119 /* initialize the audio decoder stream for VQA v1 or nonzero samplerate */
fead30d4 120 if (AV_RL16(&header[24]) || (AV_RL16(&header[0]) == 1 && AV_RL16(&header[2]) == 1)) {
3b3bbdd3 121 st = avformat_new_stream(s, NULL);
20f269dc 122 if (!st)
769e10f0 123 return AVERROR(ENOMEM);
e1ac69fa 124 st->start_time = 0;
72415b2a 125 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
fead30d4 126 if (AV_RL16(&header[0]) == 1)
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127 st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
128 else
129 st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
01f4895c 130 st->codec->codec_tag = 0; /* no tag */
fead30d4 131 st->codec->sample_rate = AV_RL16(&header[24]);
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132 if (!st->codec->sample_rate)
133 st->codec->sample_rate = 22050;
01f4895c 134 st->codec->channels = header[26];
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135 if (!st->codec->channels)
136 st->codec->channels = 1;
dd1c8f3e 137 st->codec->bits_per_coded_sample = 16;
01f4895c 138 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
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139 st->codec->bits_per_coded_sample / 4;
140 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
20f269dc 141
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142 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
143
20f269dc 144 wsvqa->audio_stream_index = st->index;
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145 wsvqa->audio_samplerate = st->codec->sample_rate;
146 wsvqa->audio_channels = st->codec->channels;
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147 wsvqa->audio_frame_counter = 0;
148 }
2fdf638b 149
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150 /* there are 0 or more chunks before the FINF chunk; iterate until
151 * FINF has been skipped and the file will be ready to be demuxed */
152 do {
b7effd4e 153 if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
01f4895c 154 av_free(st->codec->extradata);
6f3e0b21 155 return AVERROR(EIO);
20f269dc 156 }
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157 chunk_tag = AV_RB32(&scratch[0]);
158 chunk_size = AV_RB32(&scratch[4]);
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159
160 /* catch any unknown header tags, for curiousity */
161 switch (chunk_tag) {
162 case CINF_TAG:
163 case CINH_TAG:
164 case CIND_TAG:
165 case PINF_TAG:
166 case PINH_TAG:
167 case PIND_TAG:
168 case FINF_TAG:
61710f7b 169 case CMDS_TAG:
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170 break;
171
172 default:
bc874dae 173 av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n",
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174 scratch[0], scratch[1],
175 scratch[2], scratch[3]);
176 break;
177 }
178
45a8a02a 179 avio_skip(pb, chunk_size);
20f269dc 180 } while (chunk_tag != FINF_TAG);
2fdf638b 181
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182 return 0;
183}
184
185static int wsvqa_read_packet(AVFormatContext *s,
186 AVPacket *pkt)
187{
e4141433 188 WsVqaDemuxContext *wsvqa = s->priv_data;
ae628ec1 189 AVIOContext *pb = s->pb;
61710f7b 190 int ret = -1;
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191 unsigned char preamble[VQA_PREAMBLE_SIZE];
192 unsigned int chunk_type;
193 unsigned int chunk_size;
194 int skip_byte;
195
b7effd4e 196 while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
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197 chunk_type = AV_RB32(&preamble[0]);
198 chunk_size = AV_RB32(&preamble[4]);
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199 skip_byte = chunk_size & 0x01;
200
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201 if ((chunk_type == SND2_TAG || chunk_type == SND1_TAG) && wsvqa->audio_channels == 0) {
202 av_log(s, AV_LOG_ERROR, "audio chunk without any audio header information found\n");
203 return AVERROR_INVALIDDATA;
204 }
205
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206 if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
207
208 if (av_new_packet(pkt, chunk_size))
6f3e0b21 209 return AVERROR(EIO);
b7effd4e 210 ret = avio_read(pb, pkt->data, chunk_size);
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211 if (ret != chunk_size) {
212 av_free_packet(pkt);
6f3e0b21 213 return AVERROR(EIO);
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214 }
215
216 if (chunk_type == SND2_TAG) {
217 pkt->stream_index = wsvqa->audio_stream_index;
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218 /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
219 wsvqa->audio_frame_counter += (chunk_size * 2) / wsvqa->audio_channels;
220 } else if(chunk_type == SND1_TAG) {
221 pkt->stream_index = wsvqa->audio_stream_index;
61710f7b 222 /* unpacked size is stored in header */
fead30d4 223 wsvqa->audio_frame_counter += AV_RL16(pkt->data) / wsvqa->audio_channels;
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224 } else {
225 pkt->stream_index = wsvqa->video_stream_index;
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226 }
227 /* stay on 16-bit alignment */
228 if (skip_byte)
45a8a02a 229 avio_skip(pb, 1);
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230
231 return ret;
2fdf638b 232 } else {
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233 switch(chunk_type){
234 case CMDS_TAG:
235 case SND0_TAG:
236 break;
237 default:
238 av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type);
239 }
45a8a02a 240 avio_skip(pb, chunk_size + skip_byte);
2fdf638b 241 }
61710f7b 242 }
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243
244 return ret;
245}
246
c6610a21 247AVInputFormat ff_wsvqa_demuxer = {
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248 .name = "wsvqa",
249 .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA format"),
250 .priv_data_size = sizeof(WsVqaDemuxContext),
251 .read_probe = wsvqa_probe,
252 .read_header = wsvqa_read_header,
253 .read_packet = wsvqa_read_packet,
2fdf638b 254};