/*
- * WavPack demuxer
- * Copyright (c) 2006,2011 Konstantin Shishkov
+ * WavPack shared functions
*
* This file is part of Libav.
*
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavutil/audioconvert.h"
-#include "libavutil/intreadwrite.h"
-#include "libavutil/dict.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
-
-#define WV_START_BLOCK 0x0800
-#define WV_END_BLOCK 0x1000
-#define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
-
-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 chmask;
- uint32_t samples, soff;
- int multichannel;
- 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, AVIOContext *pb, int append)
-{
- WVContext *wc = ctx->priv_data;
- uint32_t tag, ver;
- int size;
- int rate, bpp, chan;
- uint32_t chmask;
-
- wc->pos = avio_tell(pb);
- if(!append){
- tag = avio_rl32(pb);
- if (tag != MKTAG('w', 'v', 'p', 'k'))
- return -1;
- size = avio_rl32(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 = avio_rl16(pb);
- if(ver < 0x402 || ver > 0x410){
- av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
- return -1;
- }
- avio_r8(pb); // track no
- avio_r8(pb); // track sub index
- wc->samples = avio_rl32(pb); // total samples in file
- wc->soff = avio_rl32(pb); // offset in samples of current block
- avio_read(pb, wc->extra, WV_EXTRA_SIZE);
- }else{
- size = wc->blksize;
- }
- wc->flags = AV_RL32(wc->extra + 4);
- // blocks with zero samples don't contain actual audio information and should be ignored
- if (!AV_RN32(wc->extra))
- return 0;
- //parse flags
- bpp = ((wc->flags & 3) + 1) << 3;
- chan = 1 + !(wc->flags & WV_MONO);
- chmask = wc->flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
- rate = wv_rates[(wc->flags >> 23) & 0xF];
- wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
- if(wc->multichannel){
- chan = wc->chan;
- chmask = wc->chmask;
- }
- if((rate == -1 || !chan) && !wc->block_parsed){
- int64_t block_end = avio_tell(pb) + wc->blksize - 24;
- if(!pb->seekable){
- av_log(ctx, AV_LOG_ERROR, "Cannot determine additional parameters\n");
- return -1;
- }
- while(avio_tell(pb) < block_end){
- int id, size;
- id = avio_r8(pb);
- size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
- size <<= 1;
- if(id&0x40)
- size--;
- switch(id&0x3F){
- case 0xD:
- if(size <= 1){
- av_log(ctx, AV_LOG_ERROR, "Insufficient channel information\n");
- return -1;
- }
- chan = avio_r8(pb);
- switch(size - 2){
- case 0:
- chmask = avio_r8(pb);
- break;
- case 1:
- chmask = avio_rl16(pb);
- break;
- case 2:
- chmask = avio_rl24(pb);
- break;
- case 3:
- chmask = avio_rl32(pb);
- break;
- case 5:
- avio_skip(pb, 1);
- chan |= (avio_r8(pb) & 0xF) << 8;
- chmask = avio_rl24(pb);
- break;
- default:
- av_log(ctx, AV_LOG_ERROR, "Invalid channel info size %d\n", size);
- return -1;
- }
- break;
- case 0x27:
- rate = avio_rl24(pb);
- break;
- default:
- avio_skip(pb, size);
- }
- if(id&0x40)
- avio_skip(pb, 1);
- }
- if(rate == -1){
- av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
- return -1;
- }
- avio_seek(pb, block_end - wc->blksize + 24, SEEK_SET);
- }
- if(!wc->bpp) wc->bpp = bpp;
- if(!wc->chan) wc->chan = chan;
- if(!wc->chmask) wc->chmask = chmask;
- 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 && !wc->multichannel && 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)
-{
- AVIOContext *pb = s->pb;
- WVContext *wc = s->priv_data;
- AVStream *st;
+#include <stdint.h>
+#include <string.h>
- wc->block_parsed = 0;
- for(;;){
- if(wv_read_block_header(s, pb, 0) < 0)
- return -1;
- if(!AV_RN32(wc->extra))
- avio_skip(pb, wc->blksize - 24);
- else
- break;
- }
-
- /* now we are ready: build format streams */
- st = av_new_stream(s, 0);
- if (!st)
- return -1;
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_WAVPACK;
- st->codec->channels = wc->chan;
- st->codec->channel_layout = wc->chmask;
- st->codec->sample_rate = wc->rate;
- st->codec->bits_per_coded_sample = wc->bpp;
- av_set_pts_info(st, 64, 1, wc->rate);
- st->start_time = 0;
- st->duration = wc->samples;
-
- if(s->pb->seekable) {
- int64_t cur = avio_tell(s->pb);
- ff_ape_parse_tag(s);
- if(!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
- ff_id3v1_read(s);
- avio_seek(s->pb, cur, SEEK_SET);
- }
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
- return 0;
-}
+#include "wv.h"
-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;
- int size, ver, off;
+ memset(wv, 0, sizeof(*wv));
- if (s->pb->eof_reached)
- return AVERROR(EIO);
- if(wc->block_parsed){
- if(wv_read_block_header(s, s->pb, 0) < 0)
- return -1;
- }
+ if (AV_RL32(data) != MKTAG('w', 'v', 'p', 'k'))
+ return AVERROR_INVALIDDATA;
- off = wc->multichannel ? 4 : 0;
- if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0)
- return AVERROR(ENOMEM);
- if(wc->multichannel)
- AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12);
- memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE);
- ret = avio_read(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize);
- if(ret != wc->blksize){
- av_free_packet(pkt);
- return AVERROR(EIO);
- }
- while(!(wc->flags & WV_END_BLOCK)){
- if(avio_rl32(s->pb) != MKTAG('w', 'v', 'p', 'k')){
- av_free_packet(pkt);
- return -1;
- }
- if((ret = av_append_packet(s->pb, pkt, 4)) < 0){
- av_free_packet(pkt);
- return ret;
- }
- size = AV_RL32(pkt->data + pkt->size - 4);
- if(size < 24 || size > WV_BLOCK_LIMIT){
- av_free_packet(pkt);
- av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size);
- return -1;
- }
- wc->blksize = size;
- ver = avio_rl16(s->pb);
- if(ver < 0x402 || ver > 0x410){
- av_free_packet(pkt);
- av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
- return -1;
- }
- avio_r8(s->pb); // track no
- avio_r8(s->pb); // track sub index
- wc->samples = avio_rl32(s->pb); // total samples in file
- wc->soff = avio_rl32(s->pb); // offset in samples of current block
- if((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0){
- av_free_packet(pkt);
- return ret;
- }
- memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE);
+ wv->blocksize = AV_RL32(data + 4);
+ if (wv->blocksize < 24 || wv->blocksize > WV_BLOCK_LIMIT)
+ return AVERROR_INVALIDDATA;
+ wv->blocksize -= 24;
- if(wv_read_block_header(s, s->pb, 1) < 0){
- av_free_packet(pkt);
- return -1;
- }
- ret = av_append_packet(s->pb, pkt, wc->blksize);
- if(ret < 0){
- av_free_packet(pkt);
- return ret;
- }
- }
- pkt->stream_index = 0;
- wc->block_parsed = 1;
- pkt->pts = wc->soff;
- av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
- return 0;
-}
+ 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);
-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;
-
- /* if found, seek there */
- if (index >= 0){
- wc->block_parsed = 1;
- avio_seek(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 = avio_tell(s->pb);
- do{
- ret = av_read_frame(s, pkt);
- if (ret < 0){
- avio_seek(s->pb, pos, SEEK_SET);
- return -1;
- }
- pts = pkt->pts;
- av_free_packet(pkt);
- }while(pts < timestamp);
return 0;
}
-
-AVInputFormat ff_wv_demuxer = {
- .name = "wv",
- .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
- .priv_data_size = sizeof(WVContext),
- .read_probe = wv_probe,
- .read_header = wv_read_header,
- .read_packet = wv_read_packet,
- .read_seek = wv_read_seek,
-};
projects / ffmpeg / blobdiff