3 * Copyright (c) 2006 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/intreadwrite.h"
27 // specs say that maximum block size is 1Mb
28 #define WV_BLOCK_LIMIT 1047576
30 #define WV_EXTRA_SIZE 12
46 static const int wv_rates[16] = {
47 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
48 32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
52 uint32_t blksize, flags;
54 uint32_t samples, soff;
56 uint8_t extra[WV_EXTRA_SIZE];
60 static int wv_probe(AVProbeData *p)
62 /* check file header */
63 if (p->buf_size <= 32)
65 if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
66 p->buf[2] == 'p' && p->buf[3] == 'k')
67 return AVPROBE_SCORE_MAX;
72 static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
74 WVContext *wc = ctx->priv_data;
79 wc->pos = url_ftell(pb);
81 if (tag != MKTAG('w', 'v', 'p', 'k'))
84 if(size < 24 || size > WV_BLOCK_LIMIT){
85 av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
90 if(ver < 0x402 || ver > 0x410){
91 av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
94 get_byte(pb); // track no
95 get_byte(pb); // track sub index
96 wc->samples = get_le32(pb); // total samples in file
97 wc->soff = get_le32(pb); // offset in samples of current block
98 get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
99 wc->flags = AV_RL32(wc->extra + 4);
101 bpp = ((wc->flags & 3) + 1) << 3;
102 chan = 1 + !(wc->flags & WV_MONO);
103 rate = wv_rates[(wc->flags >> 23) & 0xF];
105 av_log(ctx, AV_LOG_ERROR, "Unknown sampling rate\n");
108 if(!wc->bpp) wc->bpp = bpp;
109 if(!wc->chan) wc->chan = chan;
110 if(!wc->rate) wc->rate = rate;
112 if(wc->flags && bpp != wc->bpp){
113 av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
116 if(wc->flags && chan != wc->chan){
117 av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
120 if(wc->flags && rate != wc->rate){
121 av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
124 wc->blksize = size - 24;
128 static int wv_read_header(AVFormatContext *s,
129 AVFormatParameters *ap)
131 ByteIOContext *pb = s->pb;
132 WVContext *wc = s->priv_data;
135 if(wv_read_block_header(s, pb) < 0)
138 wc->block_parsed = 0;
139 /* now we are ready: build format streams */
140 st = av_new_stream(s, 0);
143 st->codec->codec_type = CODEC_TYPE_AUDIO;
144 st->codec->codec_id = CODEC_ID_WAVPACK;
145 st->codec->channels = wc->chan;
146 st->codec->sample_rate = wc->rate;
147 st->codec->bits_per_coded_sample = wc->bpp;
148 av_set_pts_info(st, 64, 1, wc->rate);
150 s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
152 if(!url_is_streamed(s->pb)) {
153 int64_t cur = url_ftell(s->pb);
155 if(!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
157 url_fseek(s->pb, cur, SEEK_SET);
163 static int wv_read_packet(AVFormatContext *s,
166 WVContext *wc = s->priv_data;
171 if(wc->block_parsed){
172 if(wv_read_block_header(s, s->pb) < 0)
176 if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
177 return AVERROR(ENOMEM);
178 memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
179 ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
180 if(ret != wc->blksize){
184 pkt->stream_index = 0;
185 wc->block_parsed = 1;
186 pkt->size = ret + WV_EXTRA_SIZE;
188 av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
192 static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
194 AVStream *st = s->streams[stream_index];
195 WVContext *wc = s->priv_data;
196 AVPacket pkt1, *pkt = &pkt1;
198 int index = av_index_search_timestamp(st, timestamp, flags);
201 /* if found, seek there */
203 wc->block_parsed = 1;
204 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
207 /* if timestamp is out of bounds, return error */
208 if(timestamp < 0 || timestamp >= s->duration)
211 pos = url_ftell(s->pb);
213 ret = av_read_frame(s, pkt);
215 url_fseek(s->pb, pos, SEEK_SET);
220 }while(pts < timestamp);
224 AVInputFormat wv_demuxer = {
226 NULL_IF_CONFIG_SMALL("WavPack"),