| /* |
| * WavPack demuxer |
| * Copyright (c) 2006,2011 Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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, |
| * 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 |
| * 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 "internal.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; |
| |
| 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 = avformat_new_stream(s, NULL); |
| 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; |
| avpriv_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); |
| } |
| |
| return 0; |
| } |
| |
| static int wv_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| WVContext *wc = s->priv_data; |
| int ret; |
| int size, ver, off; |
| int64_t pos; |
| |
| if (url_feof(s->pb)) |
| return AVERROR(EIO); |
| if(wc->block_parsed){ |
| if(wv_read_block_header(s, s->pb, 0) < 0) |
| return -1; |
| } |
| |
| pos = wc->pos; |
| 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); |
| |
| 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], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME); |
| return 0; |
| } |
| |
| 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 && |
| timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) { |
| 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; |
| |
| 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, |
| }; |
