/* * 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, };