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[FFmpeg-devel,v4,1/2] libavcodec/pgxdec: Add PGX decoder

Message ID 20200629185618.15101-1-gautamramk@gmail.com
State Superseded
Headers show
Series [FFmpeg-devel,v4,1/2] libavcodec/pgxdec: Add PGX decoder
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Commit Message

Gautam Ramakrishnan June 29, 2020, 6:56 p.m. UTC
From: Gautam Ramakrishnan <gautamramk@gmail.com>

This patch adds a pgx decoder.
---
 Changelog               |   1 +
 doc/general.texi        |   2 +
 libavcodec/Makefile     |   1 +
 libavcodec/allcodecs.c  |   1 +
 libavcodec/codec_desc.c |   7 ++
 libavcodec/codec_id.h   |   1 +
 libavcodec/pgxdec.c     | 199 ++++++++++++++++++++++++++++++++++++++++
 libavcodec/version.h    |   2 +-
 8 files changed, 213 insertions(+), 1 deletion(-)
 create mode 100644 libavcodec/pgxdec.c

Comments

Michael Niedermayer June 30, 2020, 12:19 a.m. UTC | #1
On Tue, Jun 30, 2020 at 12:26:17AM +0530, gautamramk@gmail.com wrote:
> From: Gautam Ramakrishnan <gautamramk@gmail.com>
> 
> This patch adds a pgx decoder.
> ---
>  Changelog               |   1 +
>  doc/general.texi        |   2 +
>  libavcodec/Makefile     |   1 +
>  libavcodec/allcodecs.c  |   1 +
>  libavcodec/codec_desc.c |   7 ++
>  libavcodec/codec_id.h   |   1 +
>  libavcodec/pgxdec.c     | 199 ++++++++++++++++++++++++++++++++++++++++
>  libavcodec/version.h    |   2 +-
>  8 files changed, 213 insertions(+), 1 deletion(-)
>  create mode 100644 libavcodec/pgxdec.c
> 
> diff --git a/Changelog b/Changelog
> index a60e7d2eb8..1bb9931c0d 100644
> --- a/Changelog
> +++ b/Changelog
> @@ -4,6 +4,7 @@ releases are sorted from youngest to oldest.
>  version <next>:
>  - AudioToolbox output device
>  - MacCaption demuxer
> +- PGX decoder
>  
>  
>  version 4.3:
> diff --git a/doc/general.texi b/doc/general.texi
> index ea34b963b5..53d556c56c 100644
> --- a/doc/general.texi
> +++ b/doc/general.texi
> @@ -751,6 +751,8 @@ following image formats are supported:
>      @tab Portable GrayMap image
>  @item PGMYUV       @tab X @tab X
>      @tab PGM with U and V components in YUV 4:2:0
> +@item PGX          @tab   @tab X
> +    @tab PGX file decoder
>  @item PIC          @tab @tab X
>      @tab Pictor/PC Paint
>  @item PNG          @tab X @tab X
> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> index 5a6ea59715..12aa43fe51 100644
> --- a/libavcodec/Makefile
> +++ b/libavcodec/Makefile
> @@ -536,6 +536,7 @@ OBJS-$(CONFIG_PGM_ENCODER)             += pnmenc.o
>  OBJS-$(CONFIG_PGMYUV_DECODER)          += pnmdec.o pnm.o
>  OBJS-$(CONFIG_PGMYUV_ENCODER)          += pnmenc.o
>  OBJS-$(CONFIG_PGSSUB_DECODER)          += pgssubdec.o
> +OBJS-$(CONFIG_PGX_DECODER)             += pgxdec.o
>  OBJS-$(CONFIG_PICTOR_DECODER)          += pictordec.o cga_data.o
>  OBJS-$(CONFIG_PIXLET_DECODER)          += pixlet.o
>  OBJS-$(CONFIG_PJS_DECODER)             += textdec.o ass.o
> diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
> index fa0c08d42e..a5048290f7 100644
> --- a/libavcodec/allcodecs.c
> +++ b/libavcodec/allcodecs.c
> @@ -238,6 +238,7 @@ extern AVCodec ff_pgm_encoder;
>  extern AVCodec ff_pgm_decoder;
>  extern AVCodec ff_pgmyuv_encoder;
>  extern AVCodec ff_pgmyuv_decoder;
> +extern AVCodec ff_pgx_decoder;
>  extern AVCodec ff_pictor_decoder;
>  extern AVCodec ff_pixlet_decoder;
>  extern AVCodec ff_png_encoder;
> diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
> index 9f8847544f..67e0a3055c 100644
> --- a/libavcodec/codec_desc.c
> +++ b/libavcodec/codec_desc.c
> @@ -1405,6 +1405,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
>          .long_name = NULL_IF_CONFIG_SMALL("AVS2-P2/IEEE1857.4"),
>          .props     = AV_CODEC_PROP_LOSSY,
>      },
> +    {
> +        .id        = AV_CODEC_ID_PGX,
> +        .type      = AVMEDIA_TYPE_VIDEO,
> +        .name      = "pgx",
> +        .long_name = NULL_IF_CONFIG_SMALL("PGX (JPEG2000 Test Format)"),
> +        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
> +    },
>      {
>          .id        = AV_CODEC_ID_Y41P,
>          .type      = AVMEDIA_TYPE_VIDEO,
> diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
> index d885962c9c..896ecb0ce0 100644
> --- a/libavcodec/codec_id.h
> +++ b/libavcodec/codec_id.h
> @@ -241,6 +241,7 @@ enum AVCodecID {
>      AV_CODEC_ID_SCREENPRESSO,
>      AV_CODEC_ID_RSCC,
>      AV_CODEC_ID_AVS2,
> +    AV_CODEC_ID_PGX,
>  
>      AV_CODEC_ID_Y41P = 0x8000,
>      AV_CODEC_ID_AVRP,
> diff --git a/libavcodec/pgxdec.c b/libavcodec/pgxdec.c
> new file mode 100644
> index 0000000000..9c3b18f87d
> --- /dev/null
> +++ b/libavcodec/pgxdec.c
> @@ -0,0 +1,199 @@
> +/*
> + * PGX image format
> + * Copyright (c) 2020 Gautam Ramakrishnan
> + *
> + * 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 "avcodec.h"
> +#include "internal.h"
> +#include "bytestream.h"
> +#include "libavutil/imgutils.h"
> +
> +typedef struct PGXContext {
> +    GetByteContext  g;
> +} PGXContext;
> +
> +static int pgx_get_number(AVCodecContext *avctx, PGXContext * const s) {
> +    int ret = -1;
> +    char digit;
> +
> +    while (1) {
> +        uint64_t temp;
> +        if (!bytestream2_get_bytes_left(&s->g))
> +            return -1;
> +        digit = bytestream2_get_byte(&s->g);
> +        if (digit == ' ' || digit == 0xA || digit == 0xD)
> +            break;
> +        else if (digit < '0' || digit > '9')
> +            return -1;
> +
> +        if (ret < 0)
> +            ret = 0;
> +

> +        temp = 10 * ret + (digit - '0');

the operation is done using int, this would overflow
by the time it is assigned to 64bit its too late



> +        if (temp > INT_MAX)
> +            return -1;
> +        ret = temp;
> +    }
> +
> +    if (ret >= 0)
> +        return ret;
> +    return -1;
> +}
> +

> +static int ff_pgx_decode_header(AVCodecContext *avctx, PGXContext * s,

why does this have a ff_ prefix ?

thx

[...]
Gautam Ramakrishnan June 30, 2020, 3:01 a.m. UTC | #2
On Tue, Jun 30, 2020 at 5:49 AM Michael Niedermayer
<michael@niedermayer.cc> wrote:
>
> On Tue, Jun 30, 2020 at 12:26:17AM +0530, gautamramk@gmail.com wrote:
> > From: Gautam Ramakrishnan <gautamramk@gmail.com>
> >
> > This patch adds a pgx decoder.
> > ---
> >  Changelog               |   1 +
> >  doc/general.texi        |   2 +
> >  libavcodec/Makefile     |   1 +
> >  libavcodec/allcodecs.c  |   1 +
> >  libavcodec/codec_desc.c |   7 ++
> >  libavcodec/codec_id.h   |   1 +
> >  libavcodec/pgxdec.c     | 199 ++++++++++++++++++++++++++++++++++++++++
> >  libavcodec/version.h    |   2 +-
> >  8 files changed, 213 insertions(+), 1 deletion(-)
> >  create mode 100644 libavcodec/pgxdec.c
> >
> > diff --git a/Changelog b/Changelog
> > index a60e7d2eb8..1bb9931c0d 100644
> > --- a/Changelog
> > +++ b/Changelog
> > @@ -4,6 +4,7 @@ releases are sorted from youngest to oldest.
> >  version <next>:
> >  - AudioToolbox output device
> >  - MacCaption demuxer
> > +- PGX decoder
> >
> >
> >  version 4.3:
> > diff --git a/doc/general.texi b/doc/general.texi
> > index ea34b963b5..53d556c56c 100644
> > --- a/doc/general.texi
> > +++ b/doc/general.texi
> > @@ -751,6 +751,8 @@ following image formats are supported:
> >      @tab Portable GrayMap image
> >  @item PGMYUV       @tab X @tab X
> >      @tab PGM with U and V components in YUV 4:2:0
> > +@item PGX          @tab   @tab X
> > +    @tab PGX file decoder
> >  @item PIC          @tab @tab X
> >      @tab Pictor/PC Paint
> >  @item PNG          @tab X @tab X
> > diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> > index 5a6ea59715..12aa43fe51 100644
> > --- a/libavcodec/Makefile
> > +++ b/libavcodec/Makefile
> > @@ -536,6 +536,7 @@ OBJS-$(CONFIG_PGM_ENCODER)             += pnmenc.o
> >  OBJS-$(CONFIG_PGMYUV_DECODER)          += pnmdec.o pnm.o
> >  OBJS-$(CONFIG_PGMYUV_ENCODER)          += pnmenc.o
> >  OBJS-$(CONFIG_PGSSUB_DECODER)          += pgssubdec.o
> > +OBJS-$(CONFIG_PGX_DECODER)             += pgxdec.o
> >  OBJS-$(CONFIG_PICTOR_DECODER)          += pictordec.o cga_data.o
> >  OBJS-$(CONFIG_PIXLET_DECODER)          += pixlet.o
> >  OBJS-$(CONFIG_PJS_DECODER)             += textdec.o ass.o
> > diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
> > index fa0c08d42e..a5048290f7 100644
> > --- a/libavcodec/allcodecs.c
> > +++ b/libavcodec/allcodecs.c
> > @@ -238,6 +238,7 @@ extern AVCodec ff_pgm_encoder;
> >  extern AVCodec ff_pgm_decoder;
> >  extern AVCodec ff_pgmyuv_encoder;
> >  extern AVCodec ff_pgmyuv_decoder;
> > +extern AVCodec ff_pgx_decoder;
> >  extern AVCodec ff_pictor_decoder;
> >  extern AVCodec ff_pixlet_decoder;
> >  extern AVCodec ff_png_encoder;
> > diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
> > index 9f8847544f..67e0a3055c 100644
> > --- a/libavcodec/codec_desc.c
> > +++ b/libavcodec/codec_desc.c
> > @@ -1405,6 +1405,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
> >          .long_name = NULL_IF_CONFIG_SMALL("AVS2-P2/IEEE1857.4"),
> >          .props     = AV_CODEC_PROP_LOSSY,
> >      },
> > +    {
> > +        .id        = AV_CODEC_ID_PGX,
> > +        .type      = AVMEDIA_TYPE_VIDEO,
> > +        .name      = "pgx",
> > +        .long_name = NULL_IF_CONFIG_SMALL("PGX (JPEG2000 Test Format)"),
> > +        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
> > +    },
> >      {
> >          .id        = AV_CODEC_ID_Y41P,
> >          .type      = AVMEDIA_TYPE_VIDEO,
> > diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
> > index d885962c9c..896ecb0ce0 100644
> > --- a/libavcodec/codec_id.h
> > +++ b/libavcodec/codec_id.h
> > @@ -241,6 +241,7 @@ enum AVCodecID {
> >      AV_CODEC_ID_SCREENPRESSO,
> >      AV_CODEC_ID_RSCC,
> >      AV_CODEC_ID_AVS2,
> > +    AV_CODEC_ID_PGX,
> >
> >      AV_CODEC_ID_Y41P = 0x8000,
> >      AV_CODEC_ID_AVRP,
> > diff --git a/libavcodec/pgxdec.c b/libavcodec/pgxdec.c
> > new file mode 100644
> > index 0000000000..9c3b18f87d
> > --- /dev/null
> > +++ b/libavcodec/pgxdec.c
> > @@ -0,0 +1,199 @@
> > +/*
> > + * PGX image format
> > + * Copyright (c) 2020 Gautam Ramakrishnan
> > + *
> > + * 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 "avcodec.h"
> > +#include "internal.h"
> > +#include "bytestream.h"
> > +#include "libavutil/imgutils.h"
> > +
> > +typedef struct PGXContext {
> > +    GetByteContext  g;
> > +} PGXContext;
> > +
> > +static int pgx_get_number(AVCodecContext *avctx, PGXContext * const s) {
> > +    int ret = -1;
> > +    char digit;
> > +
> > +    while (1) {
> > +        uint64_t temp;
> > +        if (!bytestream2_get_bytes_left(&s->g))
> > +            return -1;
> > +        digit = bytestream2_get_byte(&s->g);
> > +        if (digit == ' ' || digit == 0xA || digit == 0xD)
> > +            break;
> > +        else if (digit < '0' || digit > '9')
> > +            return -1;
> > +
> > +        if (ret < 0)
> > +            ret = 0;
> > +
>
> > +        temp = 10 * ret + (digit - '0');
>
> the operation is done using int, this would overflow
> by the time it is assigned to 64bit its too late
>
I'll typecast ret on the rhs then. Thanks
>
>
> > +        if (temp > INT_MAX)
> > +            return -1;
> > +        ret = temp;
> > +    }
> > +
> > +    if (ret >= 0)
> > +        return ret;
> > +    return -1;
> > +}
> > +
>
> > +static int ff_pgx_decode_header(AVCodecContext *avctx, PGXContext * s,
>
> why does this have a ff_ prefix ?
I'll remove it. I was following pnmdec.c while writing this. Does the ff prefix
indicate that it is a non-static function?
>
Michael Niedermayer June 30, 2020, 8:34 p.m. UTC | #3
On Tue, Jun 30, 2020 at 08:31:39AM +0530, Gautam Ramakrishnan wrote:
> On Tue, Jun 30, 2020 at 5:49 AM Michael Niedermayer
> <michael@niedermayer.cc> wrote:
[...]
> >
> >
> > > +        if (temp > INT_MAX)
> > > +            return -1;
> > > +        ret = temp;
> > > +    }
> > > +
> > > +    if (ret >= 0)
> > > +        return ret;
> > > +    return -1;
> > > +}
> > > +
> >
> > > +static int ff_pgx_decode_header(AVCodecContext *avctx, PGXContext * s,
> >
> > why does this have a ff_ prefix ?
> I'll remove it. I was following pnmdec.c while writing this. Does the ff prefix
> indicate that it is a non-static function?

non statics need a ff, av, avpriv, ... prefix
each has a slightly different case to be used in,
see https://ffmpeg.org/developer.html#Naming-conventions

thx

[...]
diff mbox series

Patch

diff --git a/Changelog b/Changelog
index a60e7d2eb8..1bb9931c0d 100644
--- a/Changelog
+++ b/Changelog
@@ -4,6 +4,7 @@  releases are sorted from youngest to oldest.
 version <next>:
 - AudioToolbox output device
 - MacCaption demuxer
+- PGX decoder
 
 
 version 4.3:
diff --git a/doc/general.texi b/doc/general.texi
index ea34b963b5..53d556c56c 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -751,6 +751,8 @@  following image formats are supported:
     @tab Portable GrayMap image
 @item PGMYUV       @tab X @tab X
     @tab PGM with U and V components in YUV 4:2:0
+@item PGX          @tab   @tab X
+    @tab PGX file decoder
 @item PIC          @tab @tab X
     @tab Pictor/PC Paint
 @item PNG          @tab X @tab X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 5a6ea59715..12aa43fe51 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -536,6 +536,7 @@  OBJS-$(CONFIG_PGM_ENCODER)             += pnmenc.o
 OBJS-$(CONFIG_PGMYUV_DECODER)          += pnmdec.o pnm.o
 OBJS-$(CONFIG_PGMYUV_ENCODER)          += pnmenc.o
 OBJS-$(CONFIG_PGSSUB_DECODER)          += pgssubdec.o
+OBJS-$(CONFIG_PGX_DECODER)             += pgxdec.o
 OBJS-$(CONFIG_PICTOR_DECODER)          += pictordec.o cga_data.o
 OBJS-$(CONFIG_PIXLET_DECODER)          += pixlet.o
 OBJS-$(CONFIG_PJS_DECODER)             += textdec.o ass.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index fa0c08d42e..a5048290f7 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -238,6 +238,7 @@  extern AVCodec ff_pgm_encoder;
 extern AVCodec ff_pgm_decoder;
 extern AVCodec ff_pgmyuv_encoder;
 extern AVCodec ff_pgmyuv_decoder;
+extern AVCodec ff_pgx_decoder;
 extern AVCodec ff_pictor_decoder;
 extern AVCodec ff_pixlet_decoder;
 extern AVCodec ff_png_encoder;
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 9f8847544f..67e0a3055c 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -1405,6 +1405,13 @@  static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("AVS2-P2/IEEE1857.4"),
         .props     = AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_PGX,
+        .type      = AVMEDIA_TYPE_VIDEO,
+        .name      = "pgx",
+        .long_name = NULL_IF_CONFIG_SMALL("PGX (JPEG2000 Test Format)"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
+    },
     {
         .id        = AV_CODEC_ID_Y41P,
         .type      = AVMEDIA_TYPE_VIDEO,
diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
index d885962c9c..896ecb0ce0 100644
--- a/libavcodec/codec_id.h
+++ b/libavcodec/codec_id.h
@@ -241,6 +241,7 @@  enum AVCodecID {
     AV_CODEC_ID_SCREENPRESSO,
     AV_CODEC_ID_RSCC,
     AV_CODEC_ID_AVS2,
+    AV_CODEC_ID_PGX,
 
     AV_CODEC_ID_Y41P = 0x8000,
     AV_CODEC_ID_AVRP,
diff --git a/libavcodec/pgxdec.c b/libavcodec/pgxdec.c
new file mode 100644
index 0000000000..9c3b18f87d
--- /dev/null
+++ b/libavcodec/pgxdec.c
@@ -0,0 +1,199 @@ 
+/*
+ * PGX image format
+ * Copyright (c) 2020 Gautam Ramakrishnan
+ *
+ * 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 "avcodec.h"
+#include "internal.h"
+#include "bytestream.h"
+#include "libavutil/imgutils.h"
+
+typedef struct PGXContext {
+    GetByteContext  g;
+} PGXContext;
+
+static int pgx_get_number(AVCodecContext *avctx, PGXContext * const s) {
+    int ret = -1;
+    char digit;
+
+    while (1) {
+        uint64_t temp;
+        if (!bytestream2_get_bytes_left(&s->g))
+            return -1;
+        digit = bytestream2_get_byte(&s->g);
+        if (digit == ' ' || digit == 0xA || digit == 0xD)
+            break;
+        else if (digit < '0' || digit > '9')
+            return -1;
+
+        if (ret < 0)
+            ret = 0;
+
+        temp = 10 * ret + (digit - '0');
+        if (temp > INT_MAX)
+            return -1;
+        ret = temp;
+    }
+
+    if (ret >= 0)
+        return ret;
+    return -1;
+}
+
+static int ff_pgx_decode_header(AVCodecContext *avctx, PGXContext * s,
+                                int *depth, int *width, int *height,
+                                int *sign)
+{
+    int byte;
+
+    if (bytestream2_get_bytes_left(&s->g) < 6) {
+        return AVERROR_INVALIDDATA;
+    }
+
+    bytestream2_skip(&s->g, 6);
+
+    // Is the component signed?
+    byte = bytestream2_peek_byte(&s->g);
+    if (byte == '+') {
+        *sign = 0;
+        bytestream2_skip(&s->g, 1);
+    } else if (byte == '-') {
+        *sign = 1;
+        bytestream2_skip(&s->g, 1);
+    } else if (byte == 0)
+        goto error;
+
+    byte = bytestream2_peek_byte(&s->g);
+    if (byte == ' ')
+        bytestream2_skip(&s->g, 1);
+    else if (byte == 0)
+        goto error;
+
+    *depth = pgx_get_number(avctx, s);
+    *width = pgx_get_number(avctx, s);
+    *height = pgx_get_number(avctx, s);
+    if (*depth <= 0 || *width <= 0 || *height <= 0)
+        goto error;
+
+    if (bytestream2_peek_byte(&s->g) == 0xA)
+        bytestream2_skip(&s->g, 1);
+    return 0;
+
+error:
+    av_log(avctx, AV_LOG_ERROR, "Error in decoding header.\n");
+    return AVERROR_INVALIDDATA;
+}
+
+static inline int write_frame_8(AVPacket *avpkt, AVFrame *frame, PGXContext * const s,
+                                int width, int height, int sign, int depth)
+{
+    int i, j;
+    for (i = 0; i < height; i++) {
+        uint8_t *line = frame->data[0] + i * frame->linesize[0];
+        for (j = 0; j < width; j++) {
+            int val;
+            if (bytestream2_get_bytes_left(&s->g) < 1)
+                return AVERROR_INVALIDDATA;
+            if (sign)
+                val = bytestream2_get_byte(&s->g) + (1 << (depth - 1));
+            else
+                val = bytestream2_get_byteu(&s->g);
+            val <<= (8 - depth);
+            *(line + j) = val;
+        }
+        line += frame->linesize[0];
+    }
+    return 0;
+}
+
+static inline int write_frame_16(AVPacket *avpkt, AVFrame *frame, PGXContext * const s,
+                                 int width, int height, int sign, int depth)
+{
+    int i, j;
+    for (i = 0; i < height; i++) {
+        uint16_t *line = (uint16_t*)frame->data[0] + i*frame->linesize[0]/2;
+        for (j = 0; j < width; j++) {
+            int val;
+            if (bytestream2_get_bytes_left(&s->g) < 2)
+                return AVERROR_INVALIDDATA;
+            if (sign)
+                val = (int16_t)bytestream2_get_be16(&s->g) + (1 << (depth - 1));
+            else
+                val = bytestream2_get_be16u(&s->g);
+            val <<= (16 - depth);
+            *(line + j) = val;
+        }
+        line += frame->linesize[0]/2;
+    }
+    return 0;
+}
+
+static int pgx_decode_frame(AVCodecContext *avctx, void *data,
+                            int *got_frame, AVPacket *avpkt)
+{
+    PGXContext *s = avctx->priv_data;
+    AVFrame *p    = data;
+    int ret;
+    int bpp;
+    int width, height, depth;
+    int sign = 0;
+    bytestream2_init(&s->g, avpkt->data, avpkt->size);
+
+    if ((ret = ff_pgx_decode_header(avctx, s, &depth, &width, &height, &sign)) < 0)
+        return ret;
+    if (ret = av_image_check_size(width, height, 0, avctx)) {
+        av_log(avctx, AV_LOG_ERROR, "Image too large.\n");
+        return ret;
+    }
+    if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
+        return ret;
+
+    if (depth <= 8) {
+        avctx->pix_fmt = AV_PIX_FMT_GRAY8;
+        bpp = 8;
+    } else if (depth <= 16) {
+        avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
+        bpp = 16;
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "Maximum depth of 16 bits supported.\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+        return ret;
+    *got_frame = 1;
+    p->pict_type = AV_PICTURE_TYPE_I;
+    p->key_frame = 1;
+    avctx->bits_per_raw_sample = depth;
+    if (bpp == 8)
+        write_frame_8(avpkt, p, s, width, height, sign, depth);
+    else if (bpp == 16)
+        write_frame_16(avpkt, p, s, width, height, sign, depth);
+    return 0;
+}
+
+AVCodec ff_pgx_decoder = {
+    .name           = "pgx",
+    .long_name      = NULL_IF_CONFIG_SMALL("PGX (JPEG2000 Test Format)"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_PGX,
+    .priv_data_size = sizeof(PGXContext),
+    .decode         = pgx_decode_frame,
+    .capabilities   = AV_CODEC_CAP_DR1,
+};
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 03593026b3..482cc6d6ba 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -28,7 +28,7 @@ 
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  58
-#define LIBAVCODEC_VERSION_MINOR  93
+#define LIBAVCODEC_VERSION_MINOR  94
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \