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FFmpeg/libavformat/wvdec.c
Andreas Rheinhardt c1e439d7e9 avformat: Forward errors where possible 
It is not uncommon to find code where the caller thinks to know better
what the return value should be than the callee. E.g. something like
"if (av_new_packet(pkt, size) < 0) return AVERROR(ENOMEM);". This commit
changes several instances of this to instead forward the actual error.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-12-12 19:25:33 +01:00

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/*
* WavPack demuxer
* Copyright (c) 2006,2011 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/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "apetag.h"
#include "id3v1.h"
#include "wv.h"
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,
WV_DSD = 0x80000000,
};
static const int wv_rates[16] = {
6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
};
typedef struct WVContext {
uint8_t block_header[WV_HEADER_SIZE];
WvHeader header;
int rate, chan, bpp;
uint32_t chmask;
int multichannel;
int block_parsed;
int64_t pos;
int64_t apetag_start;
} WVContext;
static int wv_probe(const AVProbeData *p)
{
/* check file header */
if (p->buf_size <= 32)
return 0;
if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
AV_RL32(&p->buf[4]) >= 24 &&
AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
AV_RL16(&p->buf[8]) >= 0x402 &&
AV_RL16(&p->buf[8]) <= 0x410)
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
{
WVContext *wc = ctx->priv_data;
int ret;
int rate, bpp, chan;
uint32_t chmask, flags;
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;
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;
}
if (wc->header.flags & WV_DSD) {
avpriv_report_missing_feature(ctx, "WV DSD");
return AVERROR_PATCHWELCOME;
}
if (wc->header.version < 0x402 || wc->header.version > 0x410) {
avpriv_report_missing_feature(ctx, "WV version 0x%03X",
wc->header.version);
return AVERROR_PATCHWELCOME;
}
/* Blocks with zero samples don't contain actual audio information
* and should be ignored */
if (!wc->header.samples)
return 0;
// parse flags
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->header.blocksize;
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(ctx, AV_LOG_ERROR,
"Cannot determine additional parameters\n");
return AVERROR_INVALIDDATA;
}
while (avio_tell(pb) < block_end && !avio_feof(pb)) {
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 4:
avio_skip(pb, 1);
chan |= (avio_r8(pb) & 0xF) << 8;
chan += 1;
chmask = avio_rl24(pb);
break;
case 5:
avio_skip(pb, 1);
chan |= (avio_r8(pb) & 0xF) << 8;
chan += 1;
chmask = avio_rl32(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->header.blocksize, 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 (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 (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 (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;
}
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 (!wc->header.samples)
avio_skip(pb, wc->header.blocksize);
else
break;
}
/* now we are ready: build format streams */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_WAVPACK;
st->codecpar->channels = wc->chan;
st->codecpar->channel_layout = wc->chmask;
st->codecpar->sample_rate = wc->rate;
st->codecpar->bits_per_coded_sample = wc->bpp;
avpriv_set_pts_info(st, 64, 1, wc->rate);
st->start_time = 0;
if (wc->header.total_samples != 0xFFFFFFFFu)
st->duration = wc->header.total_samples;
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
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 (avio_feof(s->pb))
return AVERROR_EOF;
if (wc->block_parsed) {
if ((ret = wv_read_block_header(s, s->pb)) < 0)
return ret;
}
pos = wc->pos;
if ((ret = av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE)) < 0)
return ret;
memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
if (ret != wc->header.blocksize) {
av_packet_unref(pkt);
return AVERROR(EIO);
}
while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
if ((ret = wv_read_block_header(s, s->pb)) < 0) {
av_packet_unref(pkt);
return ret;
}
off = pkt->size;
if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
av_packet_unref(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->header.blocksize);
if (ret != wc->header.blocksize) {
av_packet_unref(pkt);
return (ret < 0) ? ret : AVERROR_EOF;
}
}
pkt->stream_index = 0;
pkt->pos = pos;
wc->block_parsed = 1;
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);
else
pkt->duration = block_samples;
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,
.flags = AVFMT_GENERIC_INDEX,
};
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