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[FFmpeg-devel,v3,1/2] libavcodec/pgxdec: Add PGX decoder

Message ID 20200628144329.7408-1-gautamramk@gmail.com
State Superseded
Headers show
Series [FFmpeg-devel,v3,1/2] libavcodec/pgxdec: Add PGX decoder
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Commit Message

Gautam Ramakrishnan June 28, 2020, 2:43 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     | 205 ++++++++++++++++++++++++++++++++++++++++
 libavcodec/version.h    |   2 +-
 8 files changed, 219 insertions(+), 1 deletion(-)
 create mode 100644 libavcodec/pgxdec.c

Comments

Michael Niedermayer June 28, 2020, 8:44 p.m. UTC | #1
On Sun, Jun 28, 2020 at 08:13:28PM +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     | 205 ++++++++++++++++++++++++++++++++++++++++
>  libavcodec/version.h    |   2 +-
>  8 files changed, 219 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..688846f797
> --- /dev/null
> +++ b/libavcodec/pgxdec.c
> @@ -0,0 +1,205 @@
> +/*
> + * 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;
> +    int numdigits = 0;
> +
> +    while (1) {
> +        if (numdigits > 10) {
> +            return -1;
> +        }

If iam not mistaken this will still overflow the 32bit int 

signed integer overflow is undefined behavior so this must be fixed
using 64bit in the intermediary and then checking for INT_MAX is
an easy way to fix it but there are many other equivalent ones


> +        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;
> +        ret = 10 * ret + (digit - '0');
> +        numdigits++;
> +    }
> +
> +    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));
> +                val <<= (8 - depth);
> +                *(line + j) = val;
> +            } 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));
> +                val <<= (16 - depth);
> +                *(line + j) = val;
> +            } 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 (av_image_check_size(width, height, 0, avctx)) {

this could forward the returned error code


> +        av_log(avctx, AV_LOG_ERROR, "Image too large.\n");
> +        return AVERROR_INVALIDDATA;
> +    }

> +    if (ret = ff_set_dimensions(avctx, width, height) < 0)

this will misbehave without some more ()

thx

[...]
Alexander Strasser June 28, 2020, 8:51 p.m. UTC | #2
On 2020-06-28 22:44 +0200, Michael Niedermayer wrote:
> On Sun, Jun 28, 2020 at 08:13:28PM +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     | 205 ++++++++++++++++++++++++++++++++++++++++
> >  libavcodec/version.h    |   2 +-
> >  8 files changed, 219 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..688846f797
> > --- /dev/null
> > +++ b/libavcodec/pgxdec.c
> > @@ -0,0 +1,205 @@
> > +/*
> > + * 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;
> > +    int numdigits = 0;
> > +
> > +    while (1) {
> > +        if (numdigits > 10) {
> > +            return -1;
> > +        }
>
> If iam not mistaken this will still overflow the 32bit int
>
> signed integer overflow is undefined behavior so this must be fixed
> using 64bit in the intermediary and then checking for INT_MAX is
> an easy way to fix it but there are many other equivalent ones
>
>
> > +        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;
> > +        ret = 10 * ret + (digit - '0');
> > +        numdigits++;
> > +    }
> > +
> > +    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));
> > +                val <<= (8 - depth);
> > +                *(line + j) = val;
> > +            } 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));
> > +                val <<= (16 - depth);
> > +                *(line + j) = val;
> > +            } 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 (av_image_check_size(width, height, 0, avctx)) {
>
> this could forward the returned error code
>
>
> > +        av_log(avctx, AV_LOG_ERROR, "Image too large.\n");
> > +        return AVERROR_INVALIDDATA;
> > +    }
>
> > +    if (ret = ff_set_dimensions(avctx, width, height) < 0)
>
> this will misbehave without some more ()

And as has been argued in other cases, putting it on its own line
before the condition is probably worth the extra line.


  Alexander
Moritz Barsnick June 28, 2020, 10:56 p.m. UTC | #3
On Sun, Jun 28, 2020 at 20:13:28 +0530, gautamramk@gmail.com wrote:
> +            int val;
> +            if (bytestream2_get_bytes_left(&s->g) < 1)
> +                return AVERROR_INVALIDDATA;
> +            if (sign) {
> +                val = bytestream2_get_byte(&s->g) + (1 << (depth - 1));
> +                val <<= (8 - depth);
> +                *(line + j) = val;
> +            } else {
> +                val = bytestream2_get_byteu(&s->g);
> +                val <<= (8 - depth);
> +                *(line + j) = val;
> +            }

I may be missing something, but it looks like you are duplicating code
in if() and else which could be put behind their blocks.

> +            if (sign) {
> +                val = (int16_t)bytestream2_get_be16(&s->g) + (1 << (depth - 1));
> +                val <<= (16 - depth);
> +                *(line + j) = val;
> +            } else {
> +                val = bytestream2_get_be16u(&s->g);
> +                val <<= (16 - depth);
> +                *(line + j) = val;
> +            }

Same here.


Apart from that, all reference samples seem to be probed, demuxed and
decoded successfully (but I didn't look at the decoding result).

Moritz
Gautam Ramakrishnan June 29, 2020, 2:09 p.m. UTC | #4
On Mon, Jun 29, 2020 at 2:14 AM Michael Niedermayer
<michael@niedermayer.cc> wrote:
>
> On Sun, Jun 28, 2020 at 08:13:28PM +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     | 205 ++++++++++++++++++++++++++++++++++++++++
> >  libavcodec/version.h    |   2 +-
> >  8 files changed, 219 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..688846f797
> > --- /dev/null
> > +++ b/libavcodec/pgxdec.c
> > @@ -0,0 +1,205 @@
> > +/*
> > + * 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;
> > +    int numdigits = 0;
> > +
> > +    while (1) {
> > +        if (numdigits > 10) {
> > +            return -1;
> > +        }
>
> If iam not mistaken this will still overflow the 32bit int
>
> signed integer overflow is undefined behavior so this must be fixed
> using 64bit in the intermediary and then checking for INT_MAX is
> an easy way to fix it but there are many other equivalent ones
Yes, Nicholas had made some suggestions regarding this, I shall follow that.
>
>
> > +        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;
> > +        ret = 10 * ret + (digit - '0');
> > +        numdigits++;
> > +    }
> > +
> > +    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));
> > +                val <<= (8 - depth);
> > +                *(line + j) = val;
> > +            } 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));
> > +                val <<= (16 - depth);
> > +                *(line + j) = val;
> > +            } 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 (av_image_check_size(width, height, 0, avctx)) {
>
> this could forward the returned error code
I shall do that.
>
>
> > +        av_log(avctx, AV_LOG_ERROR, "Image too large.\n");
> > +        return AVERROR_INVALIDDATA;
> > +    }
>
> > +    if (ret = ff_set_dimensions(avctx, width, height) < 0)
>
> this will misbehave without some more ()
Shall fix this
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..688846f797
--- /dev/null
+++ b/libavcodec/pgxdec.c
@@ -0,0 +1,205 @@ 
+/*
+ * 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;
+    int numdigits = 0;
+
+    while (1) {
+        if (numdigits > 10) {
+            return -1;
+        }
+        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;
+        ret = 10 * ret + (digit - '0');
+        numdigits++;
+    }
+
+    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));
+                val <<= (8 - depth);
+                *(line + j) = val;
+            } 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));
+                val <<= (16 - depth);
+                *(line + j) = val;
+            } 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 (av_image_check_size(width, height, 0, avctx)) {
+        av_log(avctx, AV_LOG_ERROR, "Image too large.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    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, \