From 0a1a94450a28eef854162f859e79ecfb9f97915b Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Tue, 28 May 2013 08:55:52 +0200 Subject: lavf: rename wv.c to wvdec.c wv.c will be used for shared wavpack functions. --- libavformat/wvdec.c | 366 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 366 insertions(+) create mode 100644 libavformat/wvdec.c (limited to 'libavformat/wvdec.c') diff --git a/libavformat/wvdec.c b/libavformat/wvdec.c new file mode 100644 index 0000000000..3e090001c4 --- /dev/null +++ b/libavformat/wvdec.c @@ -0,0 +1,366 @@ +/* + * WavPack demuxer + * Copyright (c) 2006,2011 Konstantin Shishkov + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/channel_layout.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_HEADER_SIZE 32 + +#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 { + uint8_t block_header[WV_HEADER_SIZE]; + uint32_t blksize, flags; + int rate, chan, bpp; + uint32_t chmask; + uint32_t samples, soff; + int multichannel; + int block_parsed; + int64_t pos; + + int64_t apetag_start; +} 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) +{ + WVContext *wc = ctx->priv_data; + uint32_t ver; + int size, ret; + int rate, bpp, chan; + uint32_t chmask; + + wc->pos = avio_tell(pb); + + /* don't return bogus packets with the ape tag data */ + if (wc->apetag_start && wc->pos >= wc->apetag_start) + return AVERROR_EOF; + + ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE); + if (ret != WV_HEADER_SIZE) + return (ret < 0) ? ret : AVERROR_EOF; + + if (AV_RL32(wc->block_header) != MKTAG('w', 'v', 'p', 'k')) + return AVERROR_INVALIDDATA; + + size = AV_RL32(wc->block_header + 4); + if (size < 24 || size > WV_BLOCK_LIMIT) { + av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size); + return AVERROR_INVALIDDATA; + } + wc->blksize = size; + ver = AV_RL32(wc->block_header + 8); + if (ver < 0x402 || ver > 0x410) { + av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver); + return AVERROR_PATCHWELCOME; + } + wc->samples = AV_RL32(wc->block_header + 12); // total samples in file + wc->soff = AV_RL32(wc->block_header + 16); // offset in samples of current block + wc->flags = AV_RL32(wc->block_header + 24); + /* Blocks with zero samples don't contain actual audio information + * and should be ignored */ + if (!AV_RN32(wc->block_header + 20)) + 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 AVERROR_INVALIDDATA; + } + 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 AVERROR_INVALIDDATA; + } + 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 AVERROR_INVALIDDATA; + } + 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 AVERROR_INVALIDDATA; + } + 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 AVERROR_INVALIDDATA; + } + 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 AVERROR_INVALIDDATA; + } + 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 AVERROR_INVALIDDATA; + } + wc->blksize = size - 24; + return 0; +} + +static int wv_read_header(AVFormatContext *s) +{ + AVIOContext *pb = s->pb; + WVContext *wc = s->priv_data; + AVStream *st; + int ret; + + wc->block_parsed = 0; + for (;;) { + if ((ret = wv_read_block_header(s, pb)) < 0) + return ret; + if (!AV_RL32(wc->block_header + 20)) + avio_skip(pb, wc->blksize - 24); + else + break; + } + + /* now we are ready: build format streams */ + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = AV_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); + wc->apetag_start = 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 off; + int64_t pos; + uint32_t block_samples; + + if (s->pb->eof_reached) + return AVERROR_EOF; + if (wc->block_parsed) { + if ((ret = wv_read_block_header(s, s->pb)) < 0) + return ret; + } + + pos = wc->pos; + if (av_new_packet(pkt, wc->blksize + WV_HEADER_SIZE) < 0) + return AVERROR(ENOMEM); + memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE); + ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->blksize); + if (ret != wc->blksize) { + av_free_packet(pkt); + return AVERROR(EIO); + } + while (!(wc->flags & WV_END_BLOCK)) { + if ((ret = wv_read_block_header(s, s->pb)) < 0) { + av_free_packet(pkt); + return ret; + } + + off = pkt->size; + if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->blksize)) < 0) { + av_free_packet(pkt); + return ret; + } + memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE); + + ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->blksize); + if (ret != wc->blksize) { + av_free_packet(pkt); + return (ret < 0) ? ret : AVERROR_EOF; + } + } + pkt->stream_index = 0; + wc->block_parsed = 1; + pkt->pts = wc->soff; + block_samples = AV_RL32(wc->block_header + 20); + if (block_samples > INT32_MAX) + av_log(s, AV_LOG_WARNING, + "Too many samples in block: %"PRIu32"\n", block_samples); + else + pkt->duration = block_samples; + + 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 AVERROR(EINVAL); + + pos = avio_tell(s->pb); + do { + ret = av_read_frame(s, pkt); + if (ret < 0) { + avio_seek(s->pb, pos, SEEK_SET); + return ret; + } + 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, +}; -- cgit v1.2.3