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FFmpeg/libavformat/brstm.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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/*
* BRSTM demuxer
* Copyright (c) 2012 Paul B Mahol
*
* 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/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"
typedef struct BRSTMDemuxContext {
uint32_t block_size;
uint32_t block_count;
uint32_t current_block;
uint32_t samples_per_block;
uint32_t last_block_used_bytes;
uint32_t last_block_size;
uint32_t last_block_samples;
uint32_t data_start;
uint8_t *table;
uint8_t *adpc;
int little_endian;
} BRSTMDemuxContext;
static int probe(const AVProbeData *p)
{
if (AV_RL32(p->buf) == MKTAG('R','S','T','M') &&
(AV_RL16(p->buf + 4) == 0xFFFE ||
AV_RL16(p->buf + 4) == 0xFEFF))
return AVPROBE_SCORE_MAX / 3 * 2;
return 0;
}
static int probe_bfstm(const AVProbeData *p)
{
if ((AV_RL32(p->buf) == MKTAG('F','S','T','M') ||
AV_RL32(p->buf) == MKTAG('C','S','T','M')) &&
(AV_RL16(p->buf + 4) == 0xFFFE ||
AV_RL16(p->buf + 4) == 0xFEFF))
return AVPROBE_SCORE_MAX / 3 * 2;
return 0;
}
static int read_close(AVFormatContext *s)
{
BRSTMDemuxContext *b = s->priv_data;
av_freep(&b->table);
av_freep(&b->adpc);
return 0;
}
static av_always_inline unsigned int read16(AVFormatContext *s)
{
BRSTMDemuxContext *b = s->priv_data;
if (b->little_endian)
return avio_rl16(s->pb);
else
return avio_rb16(s->pb);
}
static av_always_inline unsigned int read32(AVFormatContext *s)
{
BRSTMDemuxContext *b = s->priv_data;
if (b->little_endian)
return avio_rl32(s->pb);
else
return avio_rb32(s->pb);
}
static int read_header(AVFormatContext *s)
{
BRSTMDemuxContext *b = s->priv_data;
int bom, major, minor, codec, chunk;
int64_t h1offset, pos, toffset;
uint32_t size, asize, start = 0;
AVStream *st;
int ret = AVERROR_EOF;
int loop = 0;
int bfstm = !strcmp("bfstm", s->iformat->name);
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
avio_skip(s->pb, 4);
bom = avio_rb16(s->pb);
if (bom != 0xFEFF && bom != 0xFFFE) {
av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom);
return AVERROR_INVALIDDATA;
}
if (bom == 0xFFFE)
b->little_endian = 1;
if (!bfstm) {
major = avio_r8(s->pb);
minor = avio_r8(s->pb);
avio_skip(s->pb, 4); // size of file
size = read16(s);
if (size < 14)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, size - 14);
pos = avio_tell(s->pb);
if (avio_rl32(s->pb) != MKTAG('H','E','A','D'))
return AVERROR_INVALIDDATA;
} else {
uint32_t info_offset = 0;
uint16_t section_count, header_size, i;
header_size = read16(s); // 6
avio_skip(s->pb, 4); // Unknown constant 0x00030000
avio_skip(s->pb, 4); // size of file
section_count = read16(s);
avio_skip(s->pb, 2); // padding
for (i = 0; avio_tell(s->pb) < header_size
&& !(start && info_offset)
&& i < section_count; i++) {
uint16_t flag = read16(s);
avio_skip(s->pb, 2);
switch (flag) {
case 0x4000:
info_offset = read32(s);
/*info_size =*/ read32(s);
break;
case 0x4001:
avio_skip(s->pb, 4); // seek offset
avio_skip(s->pb, 4); // seek size
break;
case 0x4002:
start = read32(s) + 8;
avio_skip(s->pb, 4); //data_size = read32(s);
break;
case 0x4003:
avio_skip(s->pb, 4); // REGN offset
avio_skip(s->pb, 4); // REGN size
break;
}
}
if (!info_offset || !start)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, info_offset - avio_tell(s->pb));
pos = avio_tell(s->pb);
if (avio_rl32(s->pb) != MKTAG('I','N','F','O'))
return AVERROR_INVALIDDATA;
}
size = read32(s);
if (size < 40)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 4); // unknown
h1offset = read32(s);
if (h1offset > size)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 12);
toffset = read32(s) + 16LL;
if (toffset > size)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb));
codec = avio_r8(s->pb);
switch (codec) {
case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break;
case 1: codec = b->little_endian ?
AV_CODEC_ID_PCM_S16LE_PLANAR :
AV_CODEC_ID_PCM_S16BE_PLANAR; break;
case 2: codec = b->little_endian ?
AV_CODEC_ID_ADPCM_THP_LE :
AV_CODEC_ID_ADPCM_THP; break;
default:
avpriv_request_sample(s, "codec %d", codec);
return AVERROR_PATCHWELCOME;
}
loop = avio_r8(s->pb); // loop flag
st->codecpar->codec_id = codec;
st->codecpar->channels = avio_r8(s->pb);
if (!st->codecpar->channels)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 1); // padding
st->codecpar->sample_rate = bfstm ? read32(s) : read16(s);
if (st->codecpar->sample_rate <= 0)
return AVERROR_INVALIDDATA;
if (!bfstm)
avio_skip(s->pb, 2); // padding
if (loop) {
if (av_dict_set_int(&s->metadata, "loop_start",
av_rescale(read32(s), AV_TIME_BASE,
st->codecpar->sample_rate),
0) < 0)
return AVERROR(ENOMEM);
} else {
avio_skip(s->pb, 4);
}
st->start_time = 0;
st->duration = read32(s);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
if (!bfstm)
start = read32(s);
b->current_block = 0;
b->block_count = read32(s);
if (b->block_count > UINT16_MAX) {
av_log(s, AV_LOG_WARNING, "too many blocks: %"PRIu32"\n", b->block_count);
return AVERROR_INVALIDDATA;
}
b->block_size = read32(s);
if (b->block_size > UINT32_MAX / st->codecpar->channels)
return AVERROR_INVALIDDATA;
b->samples_per_block = read32(s);
b->last_block_used_bytes = read32(s);
b->last_block_samples = read32(s);
b->last_block_size = read32(s);
if (b->last_block_size > UINT32_MAX / st->codecpar->channels)
return AVERROR_INVALIDDATA;
if (b->last_block_used_bytes > b->last_block_size)
return AVERROR_INVALIDDATA;
if (codec == AV_CODEC_ID_ADPCM_THP || codec == AV_CODEC_ID_ADPCM_THP_LE) {
int ch;
avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
if (!bfstm)
toffset = read32(s) + 16LL;
else
toffset = toffset + read32(s) + st->codecpar->channels * 8 - 8;
if (toffset > size)
return AVERROR_INVALIDDATA;
avio_skip(s->pb, pos + toffset - avio_tell(s->pb));
b->table = av_mallocz(32 * st->codecpar->channels);
if (!b->table)
return AVERROR(ENOMEM);
for (ch = 0; ch < st->codecpar->channels; ch++) {
if (avio_read(s->pb, b->table + ch * 32, 32) != 32) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, bfstm ? 14 : 24);
}
}
if (size < (avio_tell(s->pb) - pos)) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
while (!avio_feof(s->pb)) {
chunk = avio_rl32(s->pb);
size = read32(s);
if (size < 8) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
size -= 8;
switch (chunk) {
case MKTAG('S','E','E','K'):
case MKTAG('A','D','P','C'):
if (codec != AV_CODEC_ID_ADPCM_THP &&
codec != AV_CODEC_ID_ADPCM_THP_LE)
goto skip;
asize = b->block_count * st->codecpar->channels * 4;
if (size < asize) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (b->adpc) {
av_log(s, AV_LOG_WARNING, "skipping additional ADPC chunk\n");
goto skip;
} else {
b->adpc = av_mallocz(asize);
if (!b->adpc) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (bfstm && codec != AV_CODEC_ID_ADPCM_THP_LE) {
// Big-endian BFSTMs have little-endian SEEK tables
// for some strange reason.
int i;
for (i = 0; i < asize; i += 2) {
b->adpc[i+1] = avio_r8(s->pb);
b->adpc[i] = avio_r8(s->pb);
}
} else {
avio_read(s->pb, b->adpc, asize);
}
avio_skip(s->pb, size - asize);
}
break;
case MKTAG('D','A','T','A'):
if ((start < avio_tell(s->pb)) ||
(!b->adpc && (codec == AV_CODEC_ID_ADPCM_THP ||
codec == AV_CODEC_ID_ADPCM_THP_LE))) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_skip(s->pb, start - avio_tell(s->pb));
if (bfstm && (codec == AV_CODEC_ID_ADPCM_THP ||
codec == AV_CODEC_ID_ADPCM_THP_LE))
avio_skip(s->pb, 24);
b->data_start = avio_tell(s->pb);
if (!bfstm && (major != 1 || minor))
avpriv_request_sample(s, "Version %d.%d", major, minor);
return 0;
default:
av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk);
skip:
avio_skip(s->pb, size);
}
}
fail:
read_close(s);
return ret;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecParameters *par = s->streams[0]->codecpar;
BRSTMDemuxContext *b = s->priv_data;
uint32_t samples, size, skip = 0;
int ret, i;
if (avio_feof(s->pb))
return AVERROR_EOF;
b->current_block++;
if (b->current_block == b->block_count) {
size = b->last_block_used_bytes;
samples = b->last_block_samples;
skip = b->last_block_size - b->last_block_used_bytes;
if (samples < size * 14 / 8) {
uint32_t adjusted_size = samples / 14 * 8;
if (samples % 14)
adjusted_size += (samples % 14 + 1) / 2 + 1;
skip += size - adjusted_size;
size = adjusted_size;
}
} else if (b->current_block < b->block_count) {
size = b->block_size;
samples = b->samples_per_block;
} else {
return AVERROR_EOF;
}
if (par->codec_id == AV_CODEC_ID_ADPCM_THP ||
par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
uint8_t *dst;
if (!b->adpc) {
av_log(s, AV_LOG_ERROR, "adpcm_thp requires ADPC chunk, but none was found.\n");
return AVERROR_INVALIDDATA;
}
if (!b->table) {
b->table = av_mallocz(32 * par->channels);
if (!b->table)
return AVERROR(ENOMEM);
}
if (size > (INT_MAX - 32 - 4) ||
(32 + 4 + size) > (INT_MAX / par->channels) ||
(32 + 4 + size) * par->channels > INT_MAX - 8)
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(pkt, 8 + (32 + 4 + size) * par->channels)) < 0)
return ret;
dst = pkt->data;
if (par->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
bytestream_put_le32(&dst, size * par->channels);
bytestream_put_le32(&dst, samples);
} else {
bytestream_put_be32(&dst, size * par->channels);
bytestream_put_be32(&dst, samples);
}
bytestream_put_buffer(&dst, b->table, 32 * par->channels);
bytestream_put_buffer(&dst, b->adpc + 4 * par->channels *
(b->current_block - 1), 4 * par->channels);
for (i = 0; i < par->channels; i++) {
ret = avio_read(s->pb, dst, size);
dst += size;
avio_skip(s->pb, skip);
if (ret != size) {
av_packet_unref(pkt);
break;
}
}
pkt->duration = samples;
} else {
size *= par->channels;
ret = av_get_packet(s->pb, pkt, size);
}
pkt->stream_index = 0;
if (ret != size)
ret = AVERROR(EIO);
return ret;
}
static int read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
BRSTMDemuxContext *b = s->priv_data;
int64_t ret = 0;
timestamp /= b->samples_per_block;
ret = avio_seek(s->pb, b->data_start + timestamp * b->block_size *
st->codecpar->channels, SEEK_SET);
if (ret < 0)
return ret;
b->current_block = timestamp;
ff_update_cur_dts(s, st, timestamp * b->samples_per_block);
return 0;
}
AVInputFormat ff_brstm_demuxer = {
.name = "brstm",
.long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"),
.priv_data_size = sizeof(BRSTMDemuxContext),
.read_probe = probe,
.read_header = read_header,
.read_packet = read_packet,
.read_close = read_close,
.read_seek = read_seek,
.extensions = "brstm",
};
AVInputFormat ff_bfstm_demuxer = {
.name = "bfstm",
.long_name = NULL_IF_CONFIG_SMALL("BFSTM (Binary Cafe Stream)"),
.priv_data_size = sizeof(BRSTMDemuxContext),
.read_probe = probe_bfstm,
.read_header = read_header,
.read_packet = read_packet,
.read_close = read_close,
.read_seek = read_seek,
.extensions = "bfstm,bcstm",
};
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