| /* |
| * WavPack demuxer |
| * Copyright (c) 2006 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/intreadwrite.h" |
| #include "avformat.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 |
| if(wc->flags & WV_FLOAT){ |
| av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n"); |
| return -1; |
| } |
| |
| bpp = ((wc->flags & 3) + 1) << 3; |
| chan = 1 + !(wc->flags & WV_MONO); |
| rate = wv_rates[(wc->flags >> 23) & 0xF]; |
| if(rate == -1){ |
| av_log(ctx, AV_LOG_ERROR, "Unknown 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 != 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; |
| |
| if(wv_read_block_header(s, pb) < 0) |
| return -1; |
| |
| wc->block_parsed = 0; |
| /* 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; |
| return 0; |
| } |
| |
| static int wv_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| WVContext *wc = s->priv_data; |
| int ret; |
| |
| 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_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; |
| } |
| |
| 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; |
| 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; |
| |
| 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, |
| }; |