3 * Copyright (c) 2006,2011 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/audioconvert.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/dict.h"
30 // specs say that maximum block size is 1Mb
31 #define WV_BLOCK_LIMIT 1047576
33 #define WV_EXTRA_SIZE 12
35 #define WV_START_BLOCK 0x0800
36 #define WV_END_BLOCK 0x1000
37 #define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
53 static const int wv_rates[16] = {
54 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
55 32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
59 uint32_t blksize, flags;
62 uint32_t samples, soff;
65 uint8_t extra[WV_EXTRA_SIZE];
69 static int wv_probe(AVProbeData *p)
71 /* check file header */
72 if (p->buf_size <= 32)
74 if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
75 p->buf[2] == 'p' && p->buf[3] == 'k')
76 return AVPROBE_SCORE_MAX;
81 static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb,
84 WVContext *wc = ctx->priv_data;
90 wc->pos = avio_tell(pb);
93 if (tag != MKTAG('w', 'v', 'p', 'k'))
94 return AVERROR_INVALIDDATA;
96 if (size < 24 || size > WV_BLOCK_LIMIT) {
97 av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
98 return AVERROR_INVALIDDATA;
102 if (ver < 0x402 || ver > 0x410) {
103 av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
104 return AVERROR_PATCHWELCOME;
106 avio_r8(pb); // track no
107 avio_r8(pb); // track sub index
108 wc->samples = avio_rl32(pb); // total samples in file
109 wc->soff = avio_rl32(pb); // offset in samples of current block
110 avio_read(pb, wc->extra, WV_EXTRA_SIZE);
114 wc->flags = AV_RL32(wc->extra + 4);
115 /* Blocks with zero samples don't contain actual audio information
116 * and should be ignored */
117 if (!AV_RN32(wc->extra))
120 bpp = ((wc->flags & 3) + 1) << 3;
121 chan = 1 + !(wc->flags & WV_MONO);
122 chmask = wc->flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
123 rate = wv_rates[(wc->flags >> 23) & 0xF];
124 wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
125 if (wc->multichannel) {
129 if ((rate == -1 || !chan) && !wc->block_parsed) {
130 int64_t block_end = avio_tell(pb) + wc->blksize - 24;
132 av_log(ctx, AV_LOG_ERROR,
133 "Cannot determine additional parameters\n");
134 return AVERROR_INVALIDDATA;
136 while (avio_tell(pb) < block_end) {
139 size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
146 av_log(ctx, AV_LOG_ERROR,
147 "Insufficient channel information\n");
148 return AVERROR_INVALIDDATA;
153 chmask = avio_r8(pb);
156 chmask = avio_rl16(pb);
159 chmask = avio_rl24(pb);
162 chmask = avio_rl32(pb);
166 chan |= (avio_r8(pb) & 0xF) << 8;
167 chmask = avio_rl24(pb);
170 av_log(ctx, AV_LOG_ERROR,
171 "Invalid channel info size %d\n", size);
172 return AVERROR_INVALIDDATA;
176 rate = avio_rl24(pb);
185 av_log(ctx, AV_LOG_ERROR,
186 "Cannot determine custom sampling rate\n");
187 return AVERROR_INVALIDDATA;
189 avio_seek(pb, block_end - wc->blksize + 24, SEEK_SET);
200 if (wc->flags && bpp != wc->bpp) {
201 av_log(ctx, AV_LOG_ERROR,
202 "Bits per sample differ, this block: %i, header block: %i\n",
204 return AVERROR_INVALIDDATA;
206 if (wc->flags && !wc->multichannel && chan != wc->chan) {
207 av_log(ctx, AV_LOG_ERROR,
208 "Channels differ, this block: %i, header block: %i\n",
210 return AVERROR_INVALIDDATA;
212 if (wc->flags && rate != -1 && rate != wc->rate) {
213 av_log(ctx, AV_LOG_ERROR,
214 "Sampling rate differ, this block: %i, header block: %i\n",
216 return AVERROR_INVALIDDATA;
218 wc->blksize = size - 24;
222 static int wv_read_header(AVFormatContext *s)
224 AVIOContext *pb = s->pb;
225 WVContext *wc = s->priv_data;
229 wc->block_parsed = 0;
231 if ((ret = wv_read_block_header(s, pb, 0)) < 0)
233 if (!AV_RN32(wc->extra))
234 avio_skip(pb, wc->blksize - 24);
239 /* now we are ready: build format streams */
240 st = avformat_new_stream(s, NULL);
242 return AVERROR(ENOMEM);
243 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
244 st->codec->codec_id = CODEC_ID_WAVPACK;
245 st->codec->channels = wc->chan;
246 st->codec->channel_layout = wc->chmask;
247 st->codec->sample_rate = wc->rate;
248 st->codec->bits_per_coded_sample = wc->bpp;
249 avpriv_set_pts_info(st, 64, 1, wc->rate);
251 st->duration = wc->samples;
253 if (s->pb->seekable) {
254 int64_t cur = avio_tell(s->pb);
256 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
258 avio_seek(s->pb, cur, SEEK_SET);
264 static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
266 WVContext *wc = s->priv_data;
270 uint32_t block_samples;
274 if (wc->block_parsed) {
275 if ((ret = wv_read_block_header(s, s->pb, 0)) < 0)
280 off = wc->multichannel ? 4 : 0;
281 if (av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0)
282 return AVERROR(ENOMEM);
283 if (wc->multichannel)
284 AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12);
285 memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE);
286 ret = avio_read(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize);
287 if (ret != wc->blksize) {
291 while (!(wc->flags & WV_END_BLOCK)) {
292 if (avio_rl32(s->pb) != MKTAG('w', 'v', 'p', 'k')) {
294 return AVERROR_INVALIDDATA;
296 if ((ret = av_append_packet(s->pb, pkt, 4)) < 0) {
300 size = AV_RL32(pkt->data + pkt->size - 4);
301 if (size < 24 || size > WV_BLOCK_LIMIT) {
303 av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size);
304 return AVERROR_INVALIDDATA;
307 ver = avio_rl16(s->pb);
308 if (ver < 0x402 || ver > 0x410) {
310 av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
311 return AVERROR_PATCHWELCOME;
313 avio_r8(s->pb); // track no
314 avio_r8(s->pb); // track sub index
315 wc->samples = avio_rl32(s->pb); // total samples in file
316 wc->soff = avio_rl32(s->pb); // offset in samples of current block
317 if ((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0) {
321 memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE);
323 if ((ret = wv_read_block_header(s, s->pb, 1)) < 0) {
327 ret = av_append_packet(s->pb, pkt, wc->blksize);
333 pkt->stream_index = 0;
334 wc->block_parsed = 1;
336 block_samples = AV_RN32(wc->extra);
337 if (block_samples > INT32_MAX)
338 av_log(s, AV_LOG_WARNING,
339 "Too many samples in block: %"PRIu32"\n", block_samples);
341 pkt->duration = block_samples;
343 av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
347 static int wv_read_seek(AVFormatContext *s, int stream_index,
348 int64_t timestamp, int flags)
350 AVStream *st = s->streams[stream_index];
351 WVContext *wc = s->priv_data;
352 AVPacket pkt1, *pkt = &pkt1;
354 int index = av_index_search_timestamp(st, timestamp, flags);
357 /* if found, seek there */
359 timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {
360 wc->block_parsed = 1;
361 avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
364 /* if timestamp is out of bounds, return error */
365 if (timestamp < 0 || timestamp >= s->duration)
366 return AVERROR(EINVAL);
368 pos = avio_tell(s->pb);
370 ret = av_read_frame(s, pkt);
372 avio_seek(s->pb, pos, SEEK_SET);
377 } while(pts < timestamp);
381 AVInputFormat ff_wv_demuxer = {
383 .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
384 .priv_data_size = sizeof(WVContext),
385 .read_probe = wv_probe,
386 .read_header = wv_read_header,
387 .read_packet = wv_read_packet,
388 .read_seek = wv_read_seek,