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/bswap.h"
25 // specs say that maximum block size is 1Mb
26 #define WV_BLOCK_LIMIT 1047576
28 #define WV_EXTRA_SIZE 12
44 static const int wv_rates[16] = {
45 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
46 32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
50 uint32_t blksize, flags;
52 uint32_t samples, soff;
54 uint8_t extra[WV_EXTRA_SIZE];
58 static int wv_probe(AVProbeData *p)
60 /* check file header */
61 if (p->buf_size <= 32)
63 if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
64 p->buf[2] == 'p' && p->buf[3] == 'k')
65 return AVPROBE_SCORE_MAX;
70 static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
72 WVContext *wc = ctx->priv_data;
77 wc->pos = url_ftell(pb);
79 if (tag != MKTAG('w', 'v', 'p', 'k'))
82 if(size < 24 || size > WV_BLOCK_LIMIT){
83 av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
88 if(ver < 0x402 || ver > 0x410){
89 av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
92 get_byte(pb); // track no
93 get_byte(pb); // track sub index
94 wc->samples = get_le32(pb); // total samples in file
95 wc->soff = get_le32(pb); // offset in samples of current block
96 get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
97 wc->flags = AV_RL32(wc->extra + 4);
99 if(wc->flags & WV_FLOAT){
100 av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n");
103 if(wc->flags & WV_HYBRID){
104 av_log(ctx, AV_LOG_ERROR, "Hybrid coding mode is not supported\n");
108 bpp = ((wc->flags & 3) + 1) << 3;
109 chan = 1 + !(wc->flags & WV_MONO);
110 rate = wv_rates[(wc->flags >> 23) & 0xF];
112 av_log(ctx, AV_LOG_ERROR, "Unknown sampling rate\n");
115 if(!wc->bpp) wc->bpp = bpp;
116 if(!wc->chan) wc->chan = chan;
117 if(!wc->rate) wc->rate = rate;
119 if(wc->flags && bpp != wc->bpp){
120 av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
123 if(wc->flags && chan != wc->chan){
124 av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
127 if(wc->flags && rate != wc->rate){
128 av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
131 wc->blksize = size - 24;
135 static int wv_read_header(AVFormatContext *s,
136 AVFormatParameters *ap)
138 ByteIOContext *pb = s->pb;
139 WVContext *wc = s->priv_data;
142 if(wv_read_block_header(s, pb) < 0)
145 wc->block_parsed = 0;
146 /* now we are ready: build format streams */
147 st = av_new_stream(s, 0);
150 st->codec->codec_type = CODEC_TYPE_AUDIO;
151 st->codec->codec_id = CODEC_ID_WAVPACK;
152 st->codec->channels = wc->chan;
153 st->codec->sample_rate = wc->rate;
154 st->codec->bits_per_coded_sample = wc->bpp;
155 av_set_pts_info(st, 64, 1, wc->rate);
157 s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
161 static int wv_read_packet(AVFormatContext *s,
164 WVContext *wc = s->priv_data;
169 if(wc->block_parsed){
170 if(wv_read_block_header(s, s->pb) < 0)
174 if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
175 return AVERROR(ENOMEM);
176 memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
177 ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
178 if(ret != wc->blksize){
182 pkt->stream_index = 0;
183 wc->block_parsed = 1;
184 pkt->size = ret + WV_EXTRA_SIZE;
186 av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
190 static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
192 AVStream *st = s->streams[stream_index];
193 WVContext *wc = s->priv_data;
194 AVPacket pkt1, *pkt = &pkt1;
196 int index = av_index_search_timestamp(st, timestamp, flags);
199 /* if found, seek there */
201 wc->block_parsed = 1;
202 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
205 /* if timestamp is out of bounds, return error */
206 if(timestamp < 0 || timestamp >= s->duration)
209 pos = url_ftell(s->pb);
211 ret = av_read_frame(s, pkt);
213 url_fseek(s->pb, pos, SEEK_SET);
218 }while(pts < timestamp);
222 AVInputFormat wv_demuxer = {
224 NULL_IF_CONFIG_SMALL("WavPack"),