351 lines
10 KiB
C
351 lines
10 KiB
C
/*
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* WavPack demuxer
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* Copyright (c) 2006,2011 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/dict.h"
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#include "avformat.h"
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#include "internal.h"
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#include "apetag.h"
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#include "id3v1.h"
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#include "wv.h"
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enum WV_FLAGS {
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WV_MONO = 0x0004,
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WV_HYBRID = 0x0008,
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WV_JOINT = 0x0010,
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WV_CROSSD = 0x0020,
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WV_HSHAPE = 0x0040,
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WV_FLOAT = 0x0080,
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WV_INT32 = 0x0100,
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WV_HBR = 0x0200,
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WV_HBAL = 0x0400,
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WV_MCINIT = 0x0800,
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WV_MCEND = 0x1000,
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};
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static const int wv_rates[16] = {
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6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
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32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
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};
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typedef struct WVContext {
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uint8_t block_header[WV_HEADER_SIZE];
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WvHeader header;
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int rate, chan, bpp;
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uint32_t chmask;
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int multichannel;
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int block_parsed;
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int64_t pos;
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int64_t apetag_start;
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} WVContext;
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static int wv_probe(AVProbeData *p)
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{
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/* check file header */
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if (p->buf_size <= 32)
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return 0;
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if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
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p->buf[2] == 'p' && p->buf[3] == 'k')
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
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{
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WVContext *wc = ctx->priv_data;
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int ret;
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int rate, bpp, chan;
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uint32_t chmask, flags;
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wc->pos = avio_tell(pb);
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/* don't return bogus packets with the ape tag data */
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if (wc->apetag_start && wc->pos >= wc->apetag_start)
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return AVERROR_EOF;
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ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
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if (ret != WV_HEADER_SIZE)
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return (ret < 0) ? ret : AVERROR_EOF;
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ret = ff_wv_parse_header(&wc->header, wc->block_header);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n");
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return ret;
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}
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if (wc->header.version < 0x402 || wc->header.version > 0x410) {
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av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", wc->header.version);
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return AVERROR_PATCHWELCOME;
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}
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/* Blocks with zero samples don't contain actual audio information
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* and should be ignored */
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if (!wc->header.samples)
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return 0;
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// parse flags
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flags = wc->header.flags;
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bpp = ((flags & 3) + 1) << 3;
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chan = 1 + !(flags & WV_MONO);
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chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
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rate = wv_rates[(flags >> 23) & 0xF];
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wc->multichannel = !(wc->header.initial && wc->header.final);
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if (wc->multichannel) {
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chan = wc->chan;
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chmask = wc->chmask;
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}
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if ((rate == -1 || !chan) && !wc->block_parsed) {
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int64_t block_end = avio_tell(pb) + wc->header.blocksize;
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if (!pb->seekable) {
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av_log(ctx, AV_LOG_ERROR,
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"Cannot determine additional parameters\n");
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return AVERROR_INVALIDDATA;
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}
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while (avio_tell(pb) < block_end) {
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int id, size;
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id = avio_r8(pb);
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size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
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size <<= 1;
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if (id & 0x40)
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size--;
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switch (id & 0x3F) {
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case 0xD:
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if (size <= 1) {
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av_log(ctx, AV_LOG_ERROR,
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"Insufficient channel information\n");
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return AVERROR_INVALIDDATA;
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}
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chan = avio_r8(pb);
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switch (size - 2) {
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case 0:
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chmask = avio_r8(pb);
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break;
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case 1:
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chmask = avio_rl16(pb);
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break;
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case 2:
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chmask = avio_rl24(pb);
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break;
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case 3:
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chmask = avio_rl32(pb);
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break;
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case 5:
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avio_skip(pb, 1);
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chan |= (avio_r8(pb) & 0xF) << 8;
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chmask = avio_rl24(pb);
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break;
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default:
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av_log(ctx, AV_LOG_ERROR,
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"Invalid channel info size %d\n", size);
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return AVERROR_INVALIDDATA;
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}
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break;
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case 0x27:
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rate = avio_rl24(pb);
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break;
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default:
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avio_skip(pb, size);
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}
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if (id & 0x40)
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avio_skip(pb, 1);
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}
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if (rate == -1) {
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av_log(ctx, AV_LOG_ERROR,
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"Cannot determine custom sampling rate\n");
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return AVERROR_INVALIDDATA;
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}
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avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);
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}
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if (!wc->bpp)
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wc->bpp = bpp;
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if (!wc->chan)
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wc->chan = chan;
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if (!wc->chmask)
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wc->chmask = chmask;
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if (!wc->rate)
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wc->rate = rate;
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if (flags && bpp != wc->bpp) {
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av_log(ctx, AV_LOG_ERROR,
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"Bits per sample differ, this block: %i, header block: %i\n",
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bpp, wc->bpp);
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return AVERROR_INVALIDDATA;
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}
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if (flags && !wc->multichannel && chan != wc->chan) {
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av_log(ctx, AV_LOG_ERROR,
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"Channels differ, this block: %i, header block: %i\n",
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chan, wc->chan);
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return AVERROR_INVALIDDATA;
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}
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if (flags && rate != -1 && rate != wc->rate) {
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av_log(ctx, AV_LOG_ERROR,
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"Sampling rate differ, this block: %i, header block: %i\n",
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rate, wc->rate);
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static int wv_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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WVContext *wc = s->priv_data;
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AVStream *st;
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int ret;
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wc->block_parsed = 0;
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for (;;) {
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if ((ret = wv_read_block_header(s, pb)) < 0)
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return ret;
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if (!wc->header.samples)
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avio_skip(pb, wc->header.blocksize);
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else
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break;
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}
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/* now we are ready: build format streams */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = AV_CODEC_ID_WAVPACK;
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st->codec->channels = wc->chan;
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st->codec->channel_layout = wc->chmask;
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st->codec->sample_rate = wc->rate;
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st->codec->bits_per_coded_sample = wc->bpp;
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avpriv_set_pts_info(st, 64, 1, wc->rate);
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st->start_time = 0;
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st->duration = wc->header.total_samples;
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if (s->pb->seekable) {
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int64_t cur = avio_tell(s->pb);
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wc->apetag_start = ff_ape_parse_tag(s);
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if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
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ff_id3v1_read(s);
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avio_seek(s->pb, cur, SEEK_SET);
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}
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return 0;
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}
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static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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WVContext *wc = s->priv_data;
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int ret;
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int off;
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int64_t pos;
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uint32_t block_samples;
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if (s->pb->eof_reached)
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return AVERROR_EOF;
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if (wc->block_parsed) {
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if ((ret = wv_read_block_header(s, s->pb)) < 0)
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return ret;
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}
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pos = wc->pos;
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if (av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE) < 0)
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return AVERROR(ENOMEM);
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memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
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ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
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if (ret != wc->header.blocksize) {
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av_free_packet(pkt);
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return AVERROR(EIO);
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}
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while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
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if ((ret = wv_read_block_header(s, s->pb)) < 0) {
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av_free_packet(pkt);
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return ret;
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}
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off = pkt->size;
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if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
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av_free_packet(pkt);
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return ret;
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}
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memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
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ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
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if (ret != wc->header.blocksize) {
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av_free_packet(pkt);
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return (ret < 0) ? ret : AVERROR_EOF;
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}
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}
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pkt->stream_index = 0;
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wc->block_parsed = 1;
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pkt->pts = wc->header.block_idx;
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block_samples = wc->header.samples;
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if (block_samples > INT32_MAX)
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av_log(s, AV_LOG_WARNING,
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"Too many samples in block: %"PRIu32"\n", block_samples);
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else
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pkt->duration = block_samples;
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av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
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return 0;
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}
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static int wv_read_seek(AVFormatContext *s, int stream_index,
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int64_t timestamp, int flags)
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{
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AVStream *st = s->streams[stream_index];
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WVContext *wc = s->priv_data;
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AVPacket pkt1, *pkt = &pkt1;
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int ret;
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int index = av_index_search_timestamp(st, timestamp, flags);
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int64_t pos, pts;
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/* if found, seek there */
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if (index >= 0 &&
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timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {
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wc->block_parsed = 1;
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avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
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return 0;
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}
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/* if timestamp is out of bounds, return error */
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if (timestamp < 0 || timestamp >= s->duration)
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return AVERROR(EINVAL);
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pos = avio_tell(s->pb);
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do {
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ret = av_read_frame(s, pkt);
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if (ret < 0) {
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avio_seek(s->pb, pos, SEEK_SET);
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return ret;
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}
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pts = pkt->pts;
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av_free_packet(pkt);
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} while(pts < timestamp);
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return 0;
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}
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AVInputFormat ff_wv_demuxer = {
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.name = "wv",
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.long_name = NULL_IF_CONFIG_SMALL("WavPack"),
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.priv_data_size = sizeof(WVContext),
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.read_probe = wv_probe,
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.read_header = wv_read_header,
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.read_packet = wv_read_packet,
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.read_seek = wv_read_seek,
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};
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