/*
- * WavPack demuxer
- * Copyright (c) 2006 Konstantin Shishkov
+ * WavPack shared functions
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavutil/intreadwrite.h"
-#include "avformat.h"
-#include "apetag.h"
-#include "id3v1.h"
-
-// specs say that maximum block size is 1Mb
-#define WV_BLOCK_LIMIT 1047576
-
-#define WV_EXTRA_SIZE 12
-
-enum WV_FLAGS{
- WV_MONO = 0x0004,
- WV_HYBRID = 0x0008,
- WV_JOINT = 0x0010,
- WV_CROSSD = 0x0020,
- WV_HSHAPE = 0x0040,
- WV_FLOAT = 0x0080,
- WV_INT32 = 0x0100,
- WV_HBR = 0x0200,
- WV_HBAL = 0x0400,
- WV_MCINIT = 0x0800,
- WV_MCEND = 0x1000,
-};
-
-static const int wv_rates[16] = {
- 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
- 32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
-};
-
-typedef struct{
- uint32_t blksize, flags;
- int rate, chan, bpp;
- uint32_t samples, soff;
- int block_parsed;
- uint8_t extra[WV_EXTRA_SIZE];
- int64_t pos;
-}WVContext;
-
-static int wv_probe(AVProbeData *p)
-{
- /* check file header */
- if (p->buf_size <= 32)
- return 0;
- if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
- p->buf[2] == 'p' && p->buf[3] == 'k')
- return AVPROBE_SCORE_MAX;
- else
- return 0;
-}
-
-static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
-{
- WVContext *wc = ctx->priv_data;
- uint32_t tag, ver;
- int size;
- int rate, bpp, chan;
-
- wc->pos = url_ftell(pb);
- tag = get_le32(pb);
- if (tag != MKTAG('w', 'v', 'p', 'k'))
- return -1;
- size = get_le32(pb);
- if(size < 24 || size > WV_BLOCK_LIMIT){
- av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
- return -1;
- }
- wc->blksize = size;
- ver = get_le16(pb);
- if(ver < 0x402 || ver > 0x410){
- av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
- return -1;
- }
- get_byte(pb); // track no
- get_byte(pb); // track sub index
- wc->samples = get_le32(pb); // total samples in file
- wc->soff = get_le32(pb); // offset in samples of current block
- get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
- wc->flags = AV_RL32(wc->extra + 4);
- //parse flags
- bpp = ((wc->flags & 3) + 1) << 3;
- chan = 1 + !(wc->flags & WV_MONO);
- rate = wv_rates[(wc->flags >> 23) & 0xF];
- if(rate == -1 && !wc->block_parsed){
- int64_t block_end = url_ftell(pb) + wc->blksize - 24;
- if(url_is_streamed(pb)){
- av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
- return -1;
- }
- while(url_ftell(pb) < block_end){
- int id, size;
- id = get_byte(pb);
- size = (id & 0x80) ? get_le24(pb) : get_byte(pb);
- size <<= 1;
- if(id&0x40)
- size--;
- if((id&0x3F) == 0x27){
- rate = get_le24(pb);
- break;
- }else{
- url_fskip(pb, size);
- }
- }
- if(rate == -1){
- av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
- return -1;
- }
- }
- if(!wc->bpp) wc->bpp = bpp;
- if(!wc->chan) wc->chan = chan;
- if(!wc->rate) wc->rate = rate;
-
- if(wc->flags && bpp != wc->bpp){
- av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
- return -1;
- }
- if(wc->flags && chan != wc->chan){
- av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
- return -1;
- }
- if(wc->flags && rate != -1 && rate != wc->rate){
- av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
- return -1;
- }
- wc->blksize = size - 24;
- return 0;
-}
-
-static int wv_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- ByteIOContext *pb = s->pb;
- WVContext *wc = s->priv_data;
- AVStream *st;
+#include <stdint.h>
+#include <string.h>
- wc->block_parsed = 0;
- if(wv_read_block_header(s, pb) < 0)
- return -1;
-
- /* now we are ready: build format streams */
- st = av_new_stream(s, 0);
- if (!st)
- return -1;
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_WAVPACK;
- st->codec->channels = wc->chan;
- st->codec->sample_rate = wc->rate;
- st->codec->bits_per_coded_sample = wc->bpp;
- av_set_pts_info(st, 64, 1, wc->rate);
- s->start_time = 0;
- s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
- if(!url_is_streamed(s->pb)) {
- int64_t cur = url_ftell(s->pb);
- ff_ape_parse_tag(s);
- if(!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
- ff_id3v1_read(s);
- url_fseek(s->pb, cur, SEEK_SET);
- }
+#include "wv.h"
- return 0;
-}
-
-static int wv_read_packet(AVFormatContext *s,
- AVPacket *pkt)
+int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
{
- WVContext *wc = s->priv_data;
- int ret;
+ memset(wv, 0, sizeof(*wv));
- if (url_feof(s->pb))
- return AVERROR(EIO);
- if(wc->block_parsed){
- if(wv_read_block_header(s, s->pb) < 0)
- return -1;
- }
+ if (AV_RL32(data) != MKTAG('w', 'v', 'p', 'k'))
+ return AVERROR_INVALIDDATA;
- if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
- return AVERROR(ENOMEM);
- memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
- ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
- if(ret != wc->blksize){
- av_free_packet(pkt);
- return AVERROR(EIO);
- }
- pkt->stream_index = 0;
- wc->block_parsed = 1;
- pkt->size = ret + WV_EXTRA_SIZE;
- pkt->pts = wc->soff;
- av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
- return 0;
-}
+ wv->blocksize = AV_RL32(data + 4);
+ if (wv->blocksize < 24 || wv->blocksize > WV_BLOCK_LIMIT)
+ return AVERROR_INVALIDDATA;
+ wv->blocksize -= 24;
-static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
-{
- AVStream *st = s->streams[stream_index];
- WVContext *wc = s->priv_data;
- AVPacket pkt1, *pkt = &pkt1;
- int ret;
- int index = av_index_search_timestamp(st, timestamp, flags);
- int64_t pos, pts;
+ wv->version = AV_RL16(data + 8);
+ wv->total_samples = AV_RL32(data + 12);
+ wv->block_idx = AV_RL32(data + 16);
+ wv->samples = AV_RL32(data + 20);
+ wv->flags = AV_RL32(data + 24);
+ wv->crc = AV_RL32(data + 28);
- /* if found, seek there */
- if (index >= 0){
- wc->block_parsed = 1;
- url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
- return 0;
- }
- /* if timestamp is out of bounds, return error */
- if(timestamp < 0 || timestamp >= s->duration)
- return -1;
+ wv->initial = !!(wv->flags & WV_FLAG_INITIAL_BLOCK);
+ wv->final = !!(wv->flags & WV_FLAG_FINAL_BLOCK);
- pos = url_ftell(s->pb);
- do{
- ret = av_read_frame(s, pkt);
- if (ret < 0){
- url_fseek(s->pb, pos, SEEK_SET);
- return -1;
- }
- pts = pkt->pts;
- av_free_packet(pkt);
- }while(pts < timestamp);
return 0;
}
-
-AVInputFormat wv_demuxer = {
- "wv",
- NULL_IF_CONFIG_SMALL("WavPack"),
- sizeof(WVContext),
- wv_probe,
- wv_read_header,
- wv_read_packet,
- NULL,
- wv_read_seek,
-};
projects / ffmpeg / blobdiff