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path: root/libavformat/wvdec.c (plain)
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1/*
2 * WavPack demuxer
3 * Copyright (c) 2006,2011 Konstantin Shishkov
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#include "libavutil/channel_layout.h"
23#include "libavutil/intreadwrite.h"
24#include "libavutil/dict.h"
25#include "avformat.h"
26#include "internal.h"
27#include "apetag.h"
28#include "id3v1.h"
29#include "wv.h"
30
31enum WV_FLAGS {
32 WV_MONO = 0x0004,
33 WV_HYBRID = 0x0008,
34 WV_JOINT = 0x0010,
35 WV_CROSSD = 0x0020,
36 WV_HSHAPE = 0x0040,
37 WV_FLOAT = 0x0080,
38 WV_INT32 = 0x0100,
39 WV_HBR = 0x0200,
40 WV_HBAL = 0x0400,
41 WV_MCINIT = 0x0800,
42 WV_MCEND = 0x1000,
43};
44
45static const int wv_rates[16] = {
46 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
47 32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
48};
49
50typedef struct WVContext {
51 uint8_t block_header[WV_HEADER_SIZE];
52 WvHeader header;
53 int rate, chan, bpp;
54 uint32_t chmask;
55 int multichannel;
56 int block_parsed;
57 int64_t pos;
58
59 int64_t apetag_start;
60} WVContext;
61
62static int wv_probe(AVProbeData *p)
63{
64 /* check file header */
65 if (p->buf_size <= 32)
66 return 0;
67 if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
68 AV_RL32(&p->buf[4]) >= 24 &&
69 AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
70 AV_RL16(&p->buf[8]) >= 0x402 &&
71 AV_RL16(&p->buf[8]) <= 0x410)
72 return AVPROBE_SCORE_MAX;
73 else
74 return 0;
75}
76
77static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
78{
79 WVContext *wc = ctx->priv_data;
80 int ret;
81 int rate, bpp, chan;
82 uint32_t chmask, flags;
83
84 wc->pos = avio_tell(pb);
85
86 /* don't return bogus packets with the ape tag data */
87 if (wc->apetag_start && wc->pos >= wc->apetag_start)
88 return AVERROR_EOF;
89
90 ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
91 if (ret != WV_HEADER_SIZE)
92 return (ret < 0) ? ret : AVERROR_EOF;
93
94 ret = ff_wv_parse_header(&wc->header, wc->block_header);
95 if (ret < 0) {
96 av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n");
97 return ret;
98 }
99
100 if (wc->header.version < 0x402 || wc->header.version > 0x410) {
101 avpriv_report_missing_feature(ctx, "WV version 0x%03X",
102 wc->header.version);
103 return AVERROR_PATCHWELCOME;
104 }
105
106 /* Blocks with zero samples don't contain actual audio information
107 * and should be ignored */
108 if (!wc->header.samples)
109 return 0;
110 // parse flags
111 flags = wc->header.flags;
112 bpp = ((flags & 3) + 1) << 3;
113 chan = 1 + !(flags & WV_MONO);
114 chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
115 rate = wv_rates[(flags >> 23) & 0xF];
116 wc->multichannel = !(wc->header.initial && wc->header.final);
117 if (wc->multichannel) {
118 chan = wc->chan;
119 chmask = wc->chmask;
120 }
121 if ((rate == -1 || !chan) && !wc->block_parsed) {
122 int64_t block_end = avio_tell(pb) + wc->header.blocksize;
123 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
124 av_log(ctx, AV_LOG_ERROR,
125 "Cannot determine additional parameters\n");
126 return AVERROR_INVALIDDATA;
127 }
128 while (avio_tell(pb) < block_end && !avio_feof(pb)) {
129 int id, size;
130 id = avio_r8(pb);
131 size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
132 size <<= 1;
133 if (id & 0x40)
134 size--;
135 switch (id & 0x3F) {
136 case 0xD:
137 if (size <= 1) {
138 av_log(ctx, AV_LOG_ERROR,
139 "Insufficient channel information\n");
140 return AVERROR_INVALIDDATA;
141 }
142 chan = avio_r8(pb);
143 switch (size - 2) {
144 case 0:
145 chmask = avio_r8(pb);
146 break;
147 case 1:
148 chmask = avio_rl16(pb);
149 break;
150 case 2:
151 chmask = avio_rl24(pb);
152 break;
153 case 3:
154 chmask = avio_rl32(pb);
155 break;
156 case 5:
157 avio_skip(pb, 1);
158 chan |= (avio_r8(pb) & 0xF) << 8;
159 chmask = avio_rl24(pb);
160 break;
161 default:
162 av_log(ctx, AV_LOG_ERROR,
163 "Invalid channel info size %d\n", size);
164 return AVERROR_INVALIDDATA;
165 }
166 break;
167 case 0x27:
168 rate = avio_rl24(pb);
169 break;
170 default:
171 avio_skip(pb, size);
172 }
173 if (id & 0x40)
174 avio_skip(pb, 1);
175 }
176 if (rate == -1) {
177 av_log(ctx, AV_LOG_ERROR,
178 "Cannot determine custom sampling rate\n");
179 return AVERROR_INVALIDDATA;
180 }
181 avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);
182 }
183 if (!wc->bpp)
184 wc->bpp = bpp;
185 if (!wc->chan)
186 wc->chan = chan;
187 if (!wc->chmask)
188 wc->chmask = chmask;
189 if (!wc->rate)
190 wc->rate = rate;
191
192 if (flags && bpp != wc->bpp) {
193 av_log(ctx, AV_LOG_ERROR,
194 "Bits per sample differ, this block: %i, header block: %i\n",
195 bpp, wc->bpp);
196 return AVERROR_INVALIDDATA;
197 }
198 if (flags && !wc->multichannel && chan != wc->chan) {
199 av_log(ctx, AV_LOG_ERROR,
200 "Channels differ, this block: %i, header block: %i\n",
201 chan, wc->chan);
202 return AVERROR_INVALIDDATA;
203 }
204 if (flags && rate != -1 && rate != wc->rate) {
205 av_log(ctx, AV_LOG_ERROR,
206 "Sampling rate differ, this block: %i, header block: %i\n",
207 rate, wc->rate);
208 return AVERROR_INVALIDDATA;
209 }
210 return 0;
211}
212
213static int wv_read_header(AVFormatContext *s)
214{
215 AVIOContext *pb = s->pb;
216 WVContext *wc = s->priv_data;
217 AVStream *st;
218 int ret;
219
220 wc->block_parsed = 0;
221 for (;;) {
222 if ((ret = wv_read_block_header(s, pb)) < 0)
223 return ret;
224 if (!wc->header.samples)
225 avio_skip(pb, wc->header.blocksize);
226 else
227 break;
228 }
229
230 /* now we are ready: build format streams */
231 st = avformat_new_stream(s, NULL);
232 if (!st)
233 return AVERROR(ENOMEM);
234 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
235 st->codecpar->codec_id = AV_CODEC_ID_WAVPACK;
236 st->codecpar->channels = wc->chan;
237 st->codecpar->channel_layout = wc->chmask;
238 st->codecpar->sample_rate = wc->rate;
239 st->codecpar->bits_per_coded_sample = wc->bpp;
240 avpriv_set_pts_info(st, 64, 1, wc->rate);
241 st->start_time = 0;
242 if (wc->header.total_samples != 0xFFFFFFFFu)
243 st->duration = wc->header.total_samples;
244
245 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
246 int64_t cur = avio_tell(s->pb);
247 wc->apetag_start = ff_ape_parse_tag(s);
248 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
249 ff_id3v1_read(s);
250 avio_seek(s->pb, cur, SEEK_SET);
251 }
252
253 return 0;
254}
255
256static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
257{
258 WVContext *wc = s->priv_data;
259 int ret;
260 int off;
261 int64_t pos;
262 uint32_t block_samples;
263
264 if (avio_feof(s->pb))
265 return AVERROR_EOF;
266 if (wc->block_parsed) {
267 if ((ret = wv_read_block_header(s, s->pb)) < 0)
268 return ret;
269 }
270
271 pos = wc->pos;
272 if (av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE) < 0)
273 return AVERROR(ENOMEM);
274 memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
275 ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
276 if (ret != wc->header.blocksize) {
277 av_packet_unref(pkt);
278 return AVERROR(EIO);
279 }
280 while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
281 if ((ret = wv_read_block_header(s, s->pb)) < 0) {
282 av_packet_unref(pkt);
283 return ret;
284 }
285
286 off = pkt->size;
287 if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
288 av_packet_unref(pkt);
289 return ret;
290 }
291 memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
292
293 ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
294 if (ret != wc->header.blocksize) {
295 av_packet_unref(pkt);
296 return (ret < 0) ? ret : AVERROR_EOF;
297 }
298 }
299 pkt->stream_index = 0;
300 pkt->pos = pos;
301 wc->block_parsed = 1;
302 pkt->pts = wc->header.block_idx;
303 block_samples = wc->header.samples;
304 if (block_samples > INT32_MAX)
305 av_log(s, AV_LOG_WARNING,
306 "Too many samples in block: %"PRIu32"\n", block_samples);
307 else
308 pkt->duration = block_samples;
309
310 return 0;
311}
312
313AVInputFormat ff_wv_demuxer = {
314 .name = "wv",
315 .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
316 .priv_data_size = sizeof(WVContext),
317 .read_probe = wv_probe,
318 .read_header = wv_read_header,
319 .read_packet = wv_read_packet,
320 .flags = AVFMT_GENERIC_INDEX,
321};
322
generated by cgit at 2024-05-18 04:42:56 (GMT)