diff options
author | Anton Khirnov <anton@khirnov.net> | 2013-05-28 09:33:43 +0200 |
---|---|---|
committer | Anton Khirnov <anton@khirnov.net> | 2013-05-28 17:47:59 +0200 |
commit | 794ca87d2bff2513118de8b97595b3e23070e67d (patch) | |
tree | 86e1ad824e087fa2e7c23dc8df5bf5a310fb7108 /libavformat/wvdec.c | |
parent | 0a1a94450a28eef854162f859e79ecfb9f97915b (diff) | |
download | ffmpeg-794ca87d2bff2513118de8b97595b3e23070e67d.tar.gz |
wvdec: split block header parsing into a separate file
It will be reused by other muxers and demuxers.
Diffstat (limited to 'libavformat/wvdec.c')
-rw-r--r-- | libavformat/wvdec.c | 88 |
1 files changed, 36 insertions, 52 deletions
diff --git a/libavformat/wvdec.c b/libavformat/wvdec.c index 3e090001c4..1a2a722cb7 100644 --- a/libavformat/wvdec.c +++ b/libavformat/wvdec.c @@ -26,15 +26,7 @@ #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) +#include "wv.h" enum WV_FLAGS { WV_MONO = 0x0004, @@ -57,10 +49,9 @@ static const int wv_rates[16] = { typedef struct { uint8_t block_header[WV_HEADER_SIZE]; - uint32_t blksize, flags; + WvHeader header; int rate, chan, bpp; uint32_t chmask; - uint32_t samples, soff; int multichannel; int block_parsed; int64_t pos; @@ -83,10 +74,9 @@ static int wv_probe(AVProbeData *p) static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb) { WVContext *wc = ctx->priv_data; - uint32_t ver; - int size, ret; + int ret; int rate, bpp, chan; - uint32_t chmask; + uint32_t chmask, flags; wc->pos = avio_tell(pb); @@ -98,39 +88,34 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb) 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; + ret = ff_wv_parse_header(&wc->header, wc->block_header); + if (ret < 0) { + av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n"); + return ret; } - 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); + + if (wc->header.version < 0x402 || wc->header.version > 0x410) { + av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", wc->header.version); 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)) + if (!wc->header.samples) 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); + flags = wc->header.flags; + bpp = ((flags & 3) + 1) << 3; + chan = 1 + !(flags & WV_MONO); + chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; + rate = wv_rates[(flags >> 23) & 0xF]; + wc->multichannel = !(wc->header.initial && wc->header.final); 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; + int64_t block_end = avio_tell(pb) + wc->header.blocksize; if (!pb->seekable) { av_log(ctx, AV_LOG_ERROR, "Cannot determine additional parameters\n"); @@ -189,7 +174,7 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb) "Cannot determine custom sampling rate\n"); return AVERROR_INVALIDDATA; } - avio_seek(pb, block_end - wc->blksize + 24, SEEK_SET); + avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET); } if (!wc->bpp) wc->bpp = bpp; @@ -200,25 +185,24 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb) if (!wc->rate) wc->rate = rate; - if (wc->flags && bpp != wc->bpp) { + if (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) { + if (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) { + if (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; } @@ -233,8 +217,8 @@ static int wv_read_header(AVFormatContext *s) 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); + if (!wc->header.samples) + avio_skip(pb, wc->header.blocksize); else break; } @@ -251,7 +235,7 @@ static int wv_read_header(AVFormatContext *s) 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; + st->duration = wc->header.total_samples; if (s->pb->seekable) { int64_t cur = avio_tell(s->pb); @@ -280,37 +264,37 @@ static int wv_read_packet(AVFormatContext *s, AVPacket *pkt) } pos = wc->pos; - if (av_new_packet(pkt, wc->blksize + WV_HEADER_SIZE) < 0) + if (av_new_packet(pkt, wc->header.blocksize + 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) { + ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize); + if (ret != wc->header.blocksize) { av_free_packet(pkt); return AVERROR(EIO); } - while (!(wc->flags & WV_END_BLOCK)) { + while (!(wc->header.flags & WV_FLAG_FINAL_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) { + if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 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) { + ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize); + if (ret != wc->header.blocksize) { 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); + pkt->pts = wc->header.block_idx; + block_samples = wc->header.samples; if (block_samples > INT32_MAX) av_log(s, AV_LOG_WARNING, "Too many samples in block: %"PRIu32"\n", block_samples); |