mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
wvdec: split block header parsing into a separate file
It will be reused by other muxers and demuxers.
This commit is contained in:
parent
0a1a94450a
commit
794ca87d2b
@ -334,7 +334,7 @@ OBJS-$(CONFIG_WSAUD_DEMUXER) += westwood_aud.o
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OBJS-$(CONFIG_WSVQA_DEMUXER) += westwood_vqa.o
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OBJS-$(CONFIG_WTV_DEMUXER) += wtv.o asfdec.o asf.o asfcrypt.o \
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avlanguage.o mpegts.o isom.o
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OBJS-$(CONFIG_WV_DEMUXER) += wvdec.o apetag.o img2.o
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OBJS-$(CONFIG_WV_DEMUXER) += wvdec.o wv.o apetag.o img2.o
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OBJS-$(CONFIG_XA_DEMUXER) += xa.o
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OBJS-$(CONFIG_XMV_DEMUXER) += xmv.o
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OBJS-$(CONFIG_XWMA_DEMUXER) += xwma.o
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52
libavformat/wv.c
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52
libavformat/wv.c
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@ -0,0 +1,52 @@
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/*
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* WavPack shared functions
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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 <stdint.h>
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#include <string.h>
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "wv.h"
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int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
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{
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memset(wv, 0, sizeof(*wv));
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if (AV_RL32(data) != MKTAG('w', 'v', 'p', 'k'))
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return AVERROR_INVALIDDATA;
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wv->blocksize = AV_RL32(data + 4);
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if (wv->blocksize < 24 || wv->blocksize > WV_BLOCK_LIMIT)
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return AVERROR_INVALIDDATA;
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wv->blocksize -= 24;
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wv->version = AV_RL16(data + 8);
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wv->total_samples = AV_RL32(data + 12);
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wv->block_idx = AV_RL32(data + 16);
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wv->samples = AV_RL32(data + 20);
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wv->flags = AV_RL32(data + 24);
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wv->crc = AV_RL32(data + 28);
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wv->initial = !!(wv->flags & WV_FLAG_INITIAL_BLOCK);
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wv->final = !!(wv->flags & WV_FLAG_FINAL_BLOCK);
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return 0;
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}
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56
libavformat/wv.h
Normal file
56
libavformat/wv.h
Normal file
@ -0,0 +1,56 @@
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/*
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* WavPack shared functions
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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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#ifndef AVFORMAT_WV_H
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#define AVFORMAT_WV_H
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#include <stdint.h>
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#define WV_HEADER_SIZE 32
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#define WV_FLAG_INITIAL_BLOCK (1 << 11)
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#define WV_FLAG_FINAL_BLOCK (1 << 12)
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// specs say that maximum block size is 1Mb
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#define WV_BLOCK_LIMIT 1048576
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typedef struct WvHeader {
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uint32_t blocksize; //< size of the block data (excluding the header)
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uint16_t version; //< bitstream version
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uint32_t total_samples; //< total number of samples in the stream
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uint32_t block_idx; //< index of the first sample in this block
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uint32_t samples; //< number of samples in this block
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uint32_t flags;
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uint32_t crc;
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int initial, final;
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} WvHeader;
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/**
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* Parse a WavPack block header.
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*
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* @param wv this struct will be filled with parse header information
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* @param data header data, must be WV_HEADER_SIZE bytes long
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*
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* @return 0 on success, a negative AVERROR code on failure
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*/
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int ff_wv_parse_header(WvHeader *wv, const uint8_t *data);
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#endif /* AVFORMAT_WV_H */
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@ -26,15 +26,7 @@
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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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// specs say that maximum block size is 1Mb
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#define WV_BLOCK_LIMIT 1047576
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#define WV_HEADER_SIZE 32
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#define WV_START_BLOCK 0x0800
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#define WV_END_BLOCK 0x1000
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#define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
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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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@ -57,10 +49,9 @@ static const int wv_rates[16] = {
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typedef struct {
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uint8_t block_header[WV_HEADER_SIZE];
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uint32_t blksize, flags;
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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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uint32_t samples, soff;
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int multichannel;
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int block_parsed;
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int64_t pos;
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@ -83,10 +74,9 @@ static int wv_probe(AVProbeData *p)
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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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uint32_t ver;
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int size, ret;
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int ret;
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int rate, bpp, chan;
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uint32_t chmask;
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uint32_t chmask, flags;
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wc->pos = avio_tell(pb);
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@ -98,39 +88,34 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
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if (ret != WV_HEADER_SIZE)
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return (ret < 0) ? ret : AVERROR_EOF;
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if (AV_RL32(wc->block_header) != MKTAG('w', 'v', 'p', 'k'))
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return AVERROR_INVALIDDATA;
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size = AV_RL32(wc->block_header + 4);
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if (size < 24 || size > WV_BLOCK_LIMIT) {
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av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
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return AVERROR_INVALIDDATA;
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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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wc->blksize = size;
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ver = AV_RL32(wc->block_header + 8);
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if (ver < 0x402 || ver > 0x410) {
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av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
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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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wc->samples = AV_RL32(wc->block_header + 12); // total samples in file
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wc->soff = AV_RL32(wc->block_header + 16); // offset in samples of current block
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wc->flags = AV_RL32(wc->block_header + 24);
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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 (!AV_RN32(wc->block_header + 20))
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if (!wc->header.samples)
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return 0;
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// parse flags
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bpp = ((wc->flags & 3) + 1) << 3;
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chan = 1 + !(wc->flags & WV_MONO);
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chmask = wc->flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
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rate = wv_rates[(wc->flags >> 23) & 0xF];
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wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
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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->blksize - 24;
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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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@ -189,7 +174,7 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
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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->blksize + 24, SEEK_SET);
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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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@ -200,25 +185,24 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
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if (!wc->rate)
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wc->rate = rate;
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if (wc->flags && bpp != wc->bpp) {
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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 (wc->flags && !wc->multichannel && chan != wc->chan) {
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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 (wc->flags && rate != -1 && rate != wc->rate) {
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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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wc->blksize = size - 24;
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return 0;
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}
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@ -233,8 +217,8 @@ static int wv_read_header(AVFormatContext *s)
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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 (!AV_RL32(wc->block_header + 20))
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avio_skip(pb, wc->blksize - 24);
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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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@ -251,7 +235,7 @@ static int wv_read_header(AVFormatContext *s)
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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->samples;
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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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@ -280,37 +264,37 @@ static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
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}
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pos = wc->pos;
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if (av_new_packet(pkt, wc->blksize + WV_HEADER_SIZE) < 0)
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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->blksize);
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if (ret != wc->blksize) {
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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->flags & WV_END_BLOCK)) {
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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->blksize)) < 0) {
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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->blksize);
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if (ret != wc->blksize) {
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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->soff;
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block_samples = AV_RL32(wc->block_header + 20);
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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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