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];
104 if(rate == -1 && !wc->block_parsed){
105 int64_t block_end = url_ftell(pb) + wc->blksize - 24;
106 if(url_is_streamed(pb)){
107 av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
110 while(url_ftell(pb) < block_end){
113 size = (id & 0x80) ? get_le24(pb) : get_byte(pb);
117 if((id&0x3F) == 0x27){
125 av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
128 url_fseek(pb, block_end - wc->blksize + 24, SEEK_SET);
130 if(!wc->bpp) wc->bpp = bpp;
131 if(!wc->chan) wc->chan = chan;
132 if(!wc->rate) wc->rate = rate;
134 if(wc->flags && bpp != wc->bpp){
135 av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
138 if(wc->flags && chan != wc->chan){
139 av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
142 if(wc->flags && rate != -1 && rate != wc->rate){
143 av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
146 wc->blksize = size - 24;
150 static int wv_read_header(AVFormatContext *s,
151 AVFormatParameters *ap)
153 ByteIOContext *pb = s->pb;
154 WVContext *wc = s->priv_data;
157 wc->block_parsed = 0;
158 if(wv_read_block_header(s, pb) < 0)
161 /* now we are ready: build format streams */
162 st = av_new_stream(s, 0);
165 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
166 st->codec->codec_id = CODEC_ID_WAVPACK;
167 st->codec->channels = wc->chan;
168 st->codec->sample_rate = wc->rate;
169 st->codec->bits_per_coded_sample = wc->bpp;
170 av_set_pts_info(st, 64, 1, wc->rate);
172 st->duration = wc->samples;
174 if(!url_is_streamed(s->pb)) {
175 int64_t cur = url_ftell(s->pb);
177 if(!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
179 url_fseek(s->pb, cur, SEEK_SET);
185 static int wv_read_packet(AVFormatContext *s,
188 WVContext *wc = s->priv_data;
193 if(wc->block_parsed){
194 if(wv_read_block_header(s, s->pb) < 0)
198 if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
199 return AVERROR(ENOMEM);
200 memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
201 ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
202 if(ret != wc->blksize){
206 pkt->stream_index = 0;
207 wc->block_parsed = 1;
208 pkt->size = ret + WV_EXTRA_SIZE;
210 av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
214 static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
216 AVStream *st = s->streams[stream_index];
217 WVContext *wc = s->priv_data;
218 AVPacket pkt1, *pkt = &pkt1;
220 int index = av_index_search_timestamp(st, timestamp, flags);
223 /* if found, seek there */
225 wc->block_parsed = 1;
226 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
229 /* if timestamp is out of bounds, return error */
230 if(timestamp < 0 || timestamp >= s->duration)
233 pos = url_ftell(s->pb);
235 ret = av_read_frame(s, pkt);
237 url_fseek(s->pb, pos, SEEK_SET);
242 }while(pts < timestamp);
246 AVInputFormat wv_demuxer = {
248 NULL_IF_CONFIG_SMALL("WavPack"),