diff mbox series

[FFmpeg-devel,2/4] avformat: add demuxer for LEGO Racers' ALP format

Message ID 20200305004013.29385-3-zane@zanevaniperen.com
State Superseded
Headers show
Series High Voltage Software ALP demuxer + decoder. | expand

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Context Check Description
andriy/ffmpeg-patchwork success Make fate finished

Commit Message

Zane van Iperen March 5, 2020, 12:40 a.m. UTC 
Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
---
 libavformat/Makefile     |   1 +
 libavformat/allformats.c |   1 +
 libavformat/alp.c        | 135 +++++++++++++++++++++++++++++++++++++++
 libavformat/version.h    |   4 +-
 4 files changed, 139 insertions(+), 2 deletions(-)
 create mode 100644 libavformat/alp.c

Comments

Andreas Rheinhardt March 5, 2020, 1:26 a.m. UTC | #1 
Am 05.03.2020 um 01:40 schrieb Zane van Iperen:
> Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
> ---
>  libavformat/Makefile     |   1 +
>  libavformat/allformats.c |   1 +
>  libavformat/alp.c        | 135 +++++++++++++++++++++++++++++++++++++++
>  libavformat/version.h    |   4 +-
>  4 files changed, 139 insertions(+), 2 deletions(-)
>  create mode 100644 libavformat/alp.c
> 
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index e0681058a2..fbb29505ff 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -85,6 +85,7 @@ OBJS-$(CONFIG_AIFF_DEMUXER)              += aiffdec.o pcm.o isom.o \
>                                              mov_chan.o replaygain.o
>  OBJS-$(CONFIG_AIFF_MUXER)                += aiffenc.o id3v2enc.o
>  OBJS-$(CONFIG_AIX_DEMUXER)               += aixdec.o
> +OBJS-$(CONFIG_ALP_DEMUXER)               += alp.o
>  OBJS-$(CONFIG_AMR_DEMUXER)               += amr.o
>  OBJS-$(CONFIG_AMR_MUXER)                 += amr.o
>  OBJS-$(CONFIG_AMRNB_DEMUXER)             += amr.o
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index 0209bf0e30..08012ea208 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -46,6 +46,7 @@ extern AVInputFormat  ff_afc_demuxer;
>  extern AVInputFormat  ff_aiff_demuxer;
>  extern AVOutputFormat ff_aiff_muxer;
>  extern AVInputFormat  ff_aix_demuxer;
> +extern AVInputFormat  ff_alp_demuxer;
>  extern AVInputFormat  ff_amr_demuxer;
>  extern AVOutputFormat ff_amr_muxer;
>  extern AVInputFormat  ff_amrnb_demuxer;
> diff --git a/libavformat/alp.c b/libavformat/alp.c
> new file mode 100644
> index 0000000000..76703e7ad1
> --- /dev/null
> +++ b/libavformat/alp.c
> @@ -0,0 +1,135 @@
> +/*
> + * LEGO Racers ALP (.tun & .pcm) demuxer
> + *
> + * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
> + *
> + * 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 "avformat.h"
> +#include "internal.h"
> +#include "libavutil/intreadwrite.h"
> +
> +#define ALP_TAG            MKTAG('A', 'L', 'P', ' ')
> +#define ALP_MAX_READ_SIZE  4096
> +
> +typedef struct ALPHeader {
> +    uint32_t    magic;          /*< Magic Number, {'A', 'L', 'P', ' '} */
> +    uint32_t    header_size;    /*< Header size (after this). */
> +    char        adpcm[6];       /*< "ADPCM" */
> +    uint8_t     unk1;           /*< Unknown */
> +    uint8_t     num_channels;   /*< Channel Count. */
> +    uint32_t    sample_rate;    /*< Sample rate, only if header_size >= 12. */
> +} ALPHeader;
> +
> +static int alp_probe(const AVProbeData *p)
> +{
> +    if (AV_RL32(p->buf) != ALP_TAG)
> +        return 0;
> +
> +    if (AV_RL32(p->buf) < 8)

This check must be wrong, because you already know that the left side
here is ALP_TAG. Did you mean AV_RL32(p->buf + 4)? If so, you should
explicitly check for it being 8 or 12 (because otherwise the demuxer
would just return AVERROR_INVALIDDATA).

And why haven't you added a check based upon the "ADPCM" magic word?

> +        return 0;
> +
> +    return AVPROBE_SCORE_EXTENSION + 1;
> +}
> +
> +static int alp_read_header(AVFormatContext *s)
> +{
> +    int ret;
> +    AVStream *st;
> +    ALPHeader hdr;
> +    AVCodecParameters *par;
> +
> +    memset(&hdr, 0, sizeof(hdr));

You actually set every field you use before you use it, so this is
unnecessary.

> +
> +    if (!(st = avformat_new_stream(s, NULL)))

This could be moved down below so that you avoid allocating an
AVStream if you error out later.

> +        return AVERROR(ENOMEM);
> +
> +    if ((hdr.magic = avio_rl32(s->pb)) != ALP_TAG)
> +        return AVERROR_INVALIDDATA;
> +
> +    hdr.header_size = avio_rl32(s->pb);
> +
> +    if (hdr.header_size != 8 && hdr.header_size != 12) {
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    if ((ret = avio_read(s->pb, hdr.adpcm, sizeof(hdr.adpcm))) < 0)
> +        return ret;
> +    else if (ret != sizeof(hdr.adpcm))
> +        return AVERROR(EIO);
> +
> +    if (strncmp("ADPCM", hdr.adpcm, sizeof(hdr.adpcm)) != 0)
> +        return AVERROR_INVALIDDATA;
> +
> +    hdr.unk1                    = avio_r8(s->pb);
> +    hdr.num_channels            = avio_r8(s->pb);
> +
> +    if (hdr.header_size == 8) {
> +        /* .TUN music file */
> +        hdr.sample_rate         = 11025 * hdr.num_channels;
> +    } else {
> +        /* .PCM sound file */
> +        hdr.sample_rate         = avio_rl32(s->pb);

If you don't add a check for this, the multiplication for the bit_rate
below can overflow and par->sample_rate can end up negative.

> +    }
> +
> +    par                         = st->codecpar;
> +    par->codec_type             = AVMEDIA_TYPE_AUDIO;
> +    par->codec_id               = AV_CODEC_ID_ADPCM_IMA_ALP;
> +    par->format                 = AV_SAMPLE_FMT_S16;
> +    par->sample_rate            = hdr.sample_rate;
> +    par->channels               = hdr.num_channels;
> +
> +    if (hdr.num_channels == 1)
> +        par->channel_layout     = AV_CH_LAYOUT_MONO;
> +    else if (hdr.num_channels == 2)
> +        par->channel_layout     = AV_CH_LAYOUT_STEREO;
> +    else
> +        return AVERROR_INVALIDDATA;
> +
> +    par->bits_per_coded_sample  = 4;
> +    par->bits_per_raw_sample    = 16;
> +    par->block_align            = 1;
> +    par->bit_rate               = par->channels *
> +                                  par->sample_rate *
> +                                  par->bits_per_coded_sample;
> +
> +    avpriv_set_pts_info(st, 64, 1, par->sample_rate);
> +    return 0;
> +}
> +
> +static int alp_read_packet(AVFormatContext *s, AVPacket *pkt)
> +{
> +    int ret;
> +    AVCodecParameters *par = s->streams[0]->codecpar;
> +
> +    if ((ret = av_get_packet(s->pb, pkt, ALP_MAX_READ_SIZE)) < 0)
> +        return ret;
> +
> +    pkt->flags          &= ~AV_PKT_FLAG_CORRUPT;

Why don't you align on the '='?

> +    pkt->stream_index   = 0;
> +    pkt->duration       = ret * (8 / par->bits_per_coded_sample) / par->channels;

If par->bits_per_coded_sample is always four, you could hardcode this
here.

- Andreas
Zane van Iperen March 5, 2020, 3:19 a.m. UTC | #2 
On Thu, 5 Mar 2020 02:26:38 +0100
"Andreas Rheinhardt" <andreas.rheinhardt@gmail.com> wrote:

> Am 05.03.2020 um 01:40 schrieb Zane van Iperen:
> > Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
> > ---
> >  libavformat/Makefile     |   1 +
> >  libavformat/allformats.c |   1 +
> >  libavformat/alp.c        | 135
> > +++++++++++++++++++++++++++++++++++++++ libavformat/version.h
> > |   4 +- 4 files changed, 139 insertions(+), 2 deletions(-)
> >  create mode 100644 libavformat/alp.c
> >
> > diff --git a/libavformat/Makefile b/libavformat/Makefile
> > index e0681058a2..fbb29505ff 100644
> > --- a/libavformat/Makefile
> > +++ b/libavformat/Makefile
> > @@ -85,6 +85,7 @@ OBJS-$(CONFIG_AIFF_DEMUXER)              +=
> > aiffdec.o pcm.o isom.o \ mov_chan.o replaygain.o
> >  OBJS-$(CONFIG_AIFF_MUXER)                += aiffenc.o id3v2enc.o
> >  OBJS-$(CONFIG_AIX_DEMUXER)               += aixdec.o
> > +OBJS-$(CONFIG_ALP_DEMUXER)               += alp.o
> >  OBJS-$(CONFIG_AMR_DEMUXER)               += amr.o
> >  OBJS-$(CONFIG_AMR_MUXER)                 += amr.o
> >  OBJS-$(CONFIG_AMRNB_DEMUXER)             += amr.o
> > diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> > index 0209bf0e30..08012ea208 100644
> > --- a/libavformat/allformats.c
> > +++ b/libavformat/allformats.c
> > @@ -46,6 +46,7 @@ extern AVInputFormat  ff_afc_demuxer;
> >  extern AVInputFormat  ff_aiff_demuxer;
> >  extern AVOutputFormat ff_aiff_muxer;
> >  extern AVInputFormat  ff_aix_demuxer;
> > +extern AVInputFormat  ff_alp_demuxer;
> >  extern AVInputFormat  ff_amr_demuxer;
> >  extern AVOutputFormat ff_amr_muxer;
> >  extern AVInputFormat  ff_amrnb_demuxer;
> > diff --git a/libavformat/alp.c b/libavformat/alp.c
> > new file mode 100644
> > index 0000000000..76703e7ad1
> > --- /dev/null
> > +++ b/libavformat/alp.c
> > @@ -0,0 +1,135 @@
> > +/*
> > + * LEGO Racers ALP (.tun & .pcm) demuxer
> > + *
> > + * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
> > + *
> > + * 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 "avformat.h"
> > +#include "internal.h"
> > +#include "libavutil/intreadwrite.h"
> > +
> > +#define ALP_TAG            MKTAG('A', 'L', 'P', ' ')
> > +#define ALP_MAX_READ_SIZE  4096
> > +
> > +typedef struct ALPHeader {
> > +    uint32_t    magic;          /*< Magic Number, {'A', 'L', 'P',
> > ' '} */
> > +    uint32_t    header_size;    /*< Header size (after this). */
> > +    char        adpcm[6];       /*< "ADPCM" */
> > +    uint8_t     unk1;           /*< Unknown */
> > +    uint8_t     num_channels;   /*< Channel Count. */
> > +    uint32_t    sample_rate;    /*< Sample rate, only if
> > header_size >= 12. */ +} ALPHeader;
> > +
> > +static int alp_probe(const AVProbeData *p)
> > +{
> > +    if (AV_RL32(p->buf) != ALP_TAG)
> > +        return 0;
> > +
> > +    if (AV_RL32(p->buf) < 8)  
> 
> This check must be wrong, because you already know that the left side
> here is ALP_TAG. Did you mean AV_RL32(p->buf + 4)? If so, you should
> explicitly check for it being 8 or 12 (because otherwise the demuxer
> would just return AVERROR_INVALIDDATA).

Yep, I meant +4. Fixed.

>
> And why haven't you added a check based upon the "ADPCM" magic word?
>

...That is a good question, my bad.

> > +        return 0;
> > +
> > +    return AVPROBE_SCORE_EXTENSION + 1;
> > +}
> > +
> > +static int alp_read_header(AVFormatContext *s)
> > +{
> > +    int ret;
> > +    AVStream *st;
> > +    ALPHeader hdr;
> > +    AVCodecParameters *par;
> > +
> > +    memset(&hdr, 0, sizeof(hdr));  
> 
> You actually set every field you use before you use it, so this is
> unnecessary.
> 

Better safe then sorry. I've removed it.

> > +
> > +    if (!(st = avformat_new_stream(s, NULL)))  
> 
> This could be moved down below so that you avoid allocating an
> AVStream if you error out later.
> 

Done.

> > +        return AVERROR(ENOMEM);
> > +
> > +    if ((hdr.magic = avio_rl32(s->pb)) != ALP_TAG)
> > +        return AVERROR_INVALIDDATA;
> > +
> > +    hdr.header_size = avio_rl32(s->pb);
> > +
> > +    if (hdr.header_size != 8 && hdr.header_size != 12) {
> > +        return AVERROR_INVALIDDATA;
> > +    }
> > +
> > +    if ((ret = avio_read(s->pb, hdr.adpcm, sizeof(hdr.adpcm))) < 0)
> > +        return ret;
> > +    else if (ret != sizeof(hdr.adpcm))
> > +        return AVERROR(EIO);
> > +
> > +    if (strncmp("ADPCM", hdr.adpcm, sizeof(hdr.adpcm)) != 0)
> > +        return AVERROR_INVALIDDATA;
> > +
> > +    hdr.unk1                    = avio_r8(s->pb);
> > +    hdr.num_channels            = avio_r8(s->pb);
> > +
> > +    if (hdr.header_size == 8) {
> > +        /* .TUN music file */
> > +        hdr.sample_rate         = 11025 * hdr.num_channels;
> > +    } else {
> > +        /* .PCM sound file */
> > +        hdr.sample_rate         = avio_rl32(s->pb);  
> 
> If you don't add a check for this, the multiplication for the bit_rate
> below can overflow and par->sample_rate can end up negative.
> 

What am I checking for? Are you suggesting something like an upper
limit on hdr.sample_rate?
If so, 44100 ought to do it. I've never seen files above that.

> > +    }
> > +
> > +    par                         = st->codecpar;
> > +    par->codec_type             = AVMEDIA_TYPE_AUDIO;
> > +    par->codec_id               = AV_CODEC_ID_ADPCM_IMA_ALP;
> > +    par->format                 = AV_SAMPLE_FMT_S16;
> > +    par->sample_rate            = hdr.sample_rate;
> > +    par->channels               = hdr.num_channels;
> > +
> > +    if (hdr.num_channels == 1)
> > +        par->channel_layout     = AV_CH_LAYOUT_MONO;
> > +    else if (hdr.num_channels == 2)
> > +        par->channel_layout     = AV_CH_LAYOUT_STEREO;
> > +    else
> > +        return AVERROR_INVALIDDATA;
> > +
> > +    par->bits_per_coded_sample  = 4;
> > +    par->bits_per_raw_sample    = 16;
> > +    par->block_align            = 1;
> > +    par->bit_rate               = par->channels *
> > +                                  par->sample_rate *
> > +                                  par->bits_per_coded_sample;
> > +
> > +    avpriv_set_pts_info(st, 64, 1, par->sample_rate);
> > +    return 0;
> > +}
> > +
> > +static int alp_read_packet(AVFormatContext *s, AVPacket *pkt)
> > +{
> > +    int ret;
> > +    AVCodecParameters *par = s->streams[0]->codecpar;
> > +
> > +    if ((ret = av_get_packet(s->pb, pkt, ALP_MAX_READ_SIZE)) < 0)
> > +        return ret;
> > +
> > +    pkt->flags          &= ~AV_PKT_FLAG_CORRUPT;  
> 
> Why don't you align on the '='?
> 

Fixed.

> > +    pkt->stream_index   = 0;
> > +    pkt->duration       = ret * (8 / par->bits_per_coded_sample) /
> > par->channels;  
> 
> If par->bits_per_coded_sample is always four, you could hardcode this
> here.

Fixed.

> 
> - Andreas
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> 
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".

How's this?

https://github.com/vs49688/FFmpeg/commit/c43047dac28ac458c2b15e3aa3f5f443c24fc37d.patch

Zane
diff mbox series

Patch

diff --git a/libavformat/Makefile b/libavformat/Makefile
index e0681058a2..fbb29505ff 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -85,6 +85,7 @@  OBJS-$(CONFIG_AIFF_DEMUXER)              += aiffdec.o pcm.o isom.o \
                                             mov_chan.o replaygain.o
 OBJS-$(CONFIG_AIFF_MUXER)                += aiffenc.o id3v2enc.o
 OBJS-$(CONFIG_AIX_DEMUXER)               += aixdec.o
+OBJS-$(CONFIG_ALP_DEMUXER)               += alp.o
 OBJS-$(CONFIG_AMR_DEMUXER)               += amr.o
 OBJS-$(CONFIG_AMR_MUXER)                 += amr.o
 OBJS-$(CONFIG_AMRNB_DEMUXER)             += amr.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 0209bf0e30..08012ea208 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -46,6 +46,7 @@  extern AVInputFormat  ff_afc_demuxer;
 extern AVInputFormat  ff_aiff_demuxer;
 extern AVOutputFormat ff_aiff_muxer;
 extern AVInputFormat  ff_aix_demuxer;
+extern AVInputFormat  ff_alp_demuxer;
 extern AVInputFormat  ff_amr_demuxer;
 extern AVOutputFormat ff_amr_muxer;
 extern AVInputFormat  ff_amrnb_demuxer;
diff --git a/libavformat/alp.c b/libavformat/alp.c
new file mode 100644
index 0000000000..76703e7ad1
--- /dev/null
+++ b/libavformat/alp.c
@@ -0,0 +1,135 @@ 
+/*
+ * LEGO Racers ALP (.tun & .pcm) demuxer
+ *
+ * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
+ *
+ * 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 "avformat.h"
+#include "internal.h"
+#include "libavutil/intreadwrite.h"
+
+#define ALP_TAG            MKTAG('A', 'L', 'P', ' ')
+#define ALP_MAX_READ_SIZE  4096
+
+typedef struct ALPHeader {
+    uint32_t    magic;          /*< Magic Number, {'A', 'L', 'P', ' '} */
+    uint32_t    header_size;    /*< Header size (after this). */
+    char        adpcm[6];       /*< "ADPCM" */
+    uint8_t     unk1;           /*< Unknown */
+    uint8_t     num_channels;   /*< Channel Count. */
+    uint32_t    sample_rate;    /*< Sample rate, only if header_size >= 12. */
+} ALPHeader;
+
+static int alp_probe(const AVProbeData *p)
+{
+    if (AV_RL32(p->buf) != ALP_TAG)
+        return 0;
+
+    if (AV_RL32(p->buf) < 8)
+        return 0;
+
+    return AVPROBE_SCORE_EXTENSION + 1;
+}
+
+static int alp_read_header(AVFormatContext *s)
+{
+    int ret;
+    AVStream *st;
+    ALPHeader hdr;
+    AVCodecParameters *par;
+
+    memset(&hdr, 0, sizeof(hdr));
+
+    if (!(st = avformat_new_stream(s, NULL)))
+        return AVERROR(ENOMEM);
+
+    if ((hdr.magic = avio_rl32(s->pb)) != ALP_TAG)
+        return AVERROR_INVALIDDATA;
+
+    hdr.header_size = avio_rl32(s->pb);
+
+    if (hdr.header_size != 8 && hdr.header_size != 12) {
+        return AVERROR_INVALIDDATA;
+    }
+
+    if ((ret = avio_read(s->pb, hdr.adpcm, sizeof(hdr.adpcm))) < 0)
+        return ret;
+    else if (ret != sizeof(hdr.adpcm))
+        return AVERROR(EIO);
+
+    if (strncmp("ADPCM", hdr.adpcm, sizeof(hdr.adpcm)) != 0)
+        return AVERROR_INVALIDDATA;
+
+    hdr.unk1                    = avio_r8(s->pb);
+    hdr.num_channels            = avio_r8(s->pb);
+
+    if (hdr.header_size == 8) {
+        /* .TUN music file */
+        hdr.sample_rate         = 11025 * hdr.num_channels;
+    } else {
+        /* .PCM sound file */
+        hdr.sample_rate         = avio_rl32(s->pb);
+    }
+
+    par                         = st->codecpar;
+    par->codec_type             = AVMEDIA_TYPE_AUDIO;
+    par->codec_id               = AV_CODEC_ID_ADPCM_IMA_ALP;
+    par->format                 = AV_SAMPLE_FMT_S16;
+    par->sample_rate            = hdr.sample_rate;
+    par->channels               = hdr.num_channels;
+
+    if (hdr.num_channels == 1)
+        par->channel_layout     = AV_CH_LAYOUT_MONO;
+    else if (hdr.num_channels == 2)
+        par->channel_layout     = AV_CH_LAYOUT_STEREO;
+    else
+        return AVERROR_INVALIDDATA;
+
+    par->bits_per_coded_sample  = 4;
+    par->bits_per_raw_sample    = 16;
+    par->block_align            = 1;
+    par->bit_rate               = par->channels *
+                                  par->sample_rate *
+                                  par->bits_per_coded_sample;
+
+    avpriv_set_pts_info(st, 64, 1, par->sample_rate);
+    return 0;
+}
+
+static int alp_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret;
+    AVCodecParameters *par = s->streams[0]->codecpar;
+
+    if ((ret = av_get_packet(s->pb, pkt, ALP_MAX_READ_SIZE)) < 0)
+        return ret;
+
+    pkt->flags          &= ~AV_PKT_FLAG_CORRUPT;
+    pkt->stream_index   = 0;
+    pkt->duration       = ret * (8 / par->bits_per_coded_sample) / par->channels;
+
+    return 0;
+}
+
+AVInputFormat ff_alp_demuxer = {
+    .name           = "alp",
+    .long_name      = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
+    .read_probe     = alp_probe,
+    .read_header    = alp_read_header,
+    .read_packet    = alp_read_packet
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index 4724269b3c..a233b67351 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -32,8 +32,8 @@ 
 // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
 // Also please add any ticket numbers that you believe might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  58
-#define LIBAVFORMAT_VERSION_MINOR  39
-#define LIBAVFORMAT_VERSION_MICRO 101
+#define LIBAVFORMAT_VERSION_MINOR  40
+#define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \