* Re: [FFmpeg-devel] [PATCH] add media100 bsf and use it
2023-01-31 10:18 [FFmpeg-devel] [PATCH] add media100 bsf and use it Paul B Mahol
@ 2023-01-31 11:20 ` Andreas Rheinhardt
2023-01-31 12:48 ` Anton Khirnov
2023-01-31 15:33 ` Paul B Mahol
2 siblings, 0 replies; 4+ messages in thread
From: Andreas Rheinhardt @ 2023-01-31 11:20 UTC (permalink / raw)
To: ffmpeg-devel
Paul B Mahol:
> -static int media100_decode_frame(AVCodecContext *avctx,
> - AVFrame *frame, int *got_frame,
> - AVPacket *avpkt)
> +static int filter(AVBSFContext *ctx, AVPacket *avpkt)
> {
> - Media100Context *ctx = avctx->priv_data;
> + Media100Context *s = ctx->priv_data;
> unsigned second_field_offset = 0;
> unsigned next_field = 0;
> unsigned dht_offset[2];
> @@ -83,18 +62,20 @@ static int media100_decode_frame(AVCodecContext *avctx,
> AVPacket *pkt;
> int ret;
>
> - if (avpkt->size + 1024 > ctx->pkt->size) {
> - ret = av_grow_packet(ctx->pkt, avpkt->size + 1024 - ctx->pkt->size);
> - if (ret < 0)
> - return ret;
> - }
> + ret = ff_bsf_get_packet_ref(ctx, avpkt);
The avpkt here is destined for output; you should use s->pkt to get the
new input packet. This will allow to avoid the av_packet_move_ref() below.
> + if (ret < 0)
> + return ret;
>
> - ret = av_packet_make_writable(ctx->pkt);
> + ret = av_new_packet(s->pkt, avpkt->size + 1024);
> + if (ret < 0)
> + return ret;
> +
> + ret = av_packet_make_writable(s->pkt);
av_new_packet() always returns writable packets.
> if (ret < 0)
> return ret;
>
> bytestream2_init(&gb, avpkt->data, avpkt->size);
> - bytestream2_init_writer(&pb, ctx->pkt->data, ctx->pkt->size);
> + bytestream2_init_writer(&pb, s->pkt->data, s->pkt->size);
>
> second_field:
> bytestream2_put_be32(&pb, 0);
> @@ -107,8 +88,8 @@ second_field:
> sof_offset[field] = bytestream2_tell_p(&pb);
> bytestream2_put_be16(&pb, 17);
> bytestream2_put_byte(&pb, 8);
> - bytestream2_put_be16(&pb, avctx->height / 2);
> - bytestream2_put_be16(&pb, avctx->width);
> + bytestream2_put_be16(&pb, ctx->par_in->height / 2);
> + bytestream2_put_be16(&pb, ctx->par_in->width);
> bytestream2_put_byte(&pb, 3);
> bytestream2_put_byte(&pb, 1);
> bytestream2_put_byte(&pb, 0x21);
> @@ -164,7 +145,7 @@ second_field:
> goto second_field;
> }
>
> - pkt = ctx->pkt;
> + pkt = s->pkt;
>
> AV_WB32(pkt->data + 8, second_field_offset);
> AV_WB32(pkt->data + 12, second_field_offset);
> @@ -186,40 +167,33 @@ second_field:
>
> pkt->size = bytestream2_tell_p(&pb);
>
> - ret = avcodec_send_packet(ctx->avctx, pkt);
> - if (ret < 0) {
> - av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
> - return ret;
> - }
> + av_packet_copy_props(pkt, avpkt);
> + av_packet_unref(avpkt);
> + av_packet_move_ref(avpkt, s->pkt);
>
> - ret = avcodec_receive_frame(ctx->avctx, frame);
> - if (ret < 0)
> - return ret;
> + return 0;
> +}
>
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [FFmpeg-devel] [PATCH] add media100 bsf and use it
2023-01-31 10:18 [FFmpeg-devel] [PATCH] add media100 bsf and use it Paul B Mahol
2023-01-31 11:20 ` Andreas Rheinhardt
@ 2023-01-31 12:48 ` Anton Khirnov
2023-01-31 15:33 ` Paul B Mahol
2 siblings, 0 replies; 4+ messages in thread
From: Anton Khirnov @ 2023-01-31 12:48 UTC (permalink / raw)
To: FFmpeg development discussions and patches
Quoting Paul B Mahol (2023-01-31 11:18:52)
> Patch attached.
>
> From c9ec824211cccb745b3a4ab014d6be726c8ef1b9 Mon Sep 17 00:00:00 2001
> From: Paul B Mahol <onemda@gmail.com>
> Date: Tue, 31 Jan 2023 10:18:17 +0100
> Subject: [PATCH] avcodec: add media100_to_mjpegb bitstream filter and use it
>
> Signed-off-by: Paul B Mahol <onemda@gmail.com>
> ---
> libavcodec/Makefile | 3 +-
> libavcodec/bitstream_filters.c | 1 +
> .../{media100.c => media100_to_mjpegb_bsf.c} | 112 +++++++-----------
> libavcodec/mjpegbdec.c | 15 +++
> 4 files changed, 61 insertions(+), 70 deletions(-)
> rename libavcodec/{media100.c => media100_to_mjpegb_bsf.c} (65%)
Needs media100_decoder_select="media100_to_mjpegb_bsf" in configure and
a changelog entry.
> -static av_cold int media100_decode_init(AVCodecContext *avctx)
> +static av_cold int init(AVBSFContext *ctx)
> {
> - Media100Context *ctx = avctx->priv_data;
> - const AVCodec *codec;
> - int ret;
> -
> - codec = avcodec_find_decoder(AV_CODEC_ID_MJPEGB);
> - if (!codec)
> - return AVERROR_BUG;
> - ctx->avctx = avcodec_alloc_context3(codec);
> - if (!ctx->avctx)
> - return AVERROR(ENOMEM);
> - ctx->avctx->thread_count = 1;
> - ctx->avctx->flags = avctx->flags;
> - ctx->avctx->flags2 = avctx->flags2;
> - ctx->avctx->width = ctx->avctx->coded_width = avctx->width;
> - ctx->avctx->height = ctx->avctx->coded_height = avctx->height;
> -
> - ret = avcodec_open2(ctx->avctx, codec, NULL);
> - if (ret < 0)
> - return ret;
> + Media100Context *s = ctx->priv_data;
>
> - ctx->pkt = av_packet_alloc();
> - if (!ctx->pkt)
> + s->pkt = av_packet_alloc();
> + if (!s->pkt)
> return AVERROR(ENOMEM);
Should set ctx->par_out->codec_id to AV_CODEC_ID_MJPEGB, so people can
use this bsf standalone.
>
> return 0;
> }
>
> -static int media100_decode_frame(AVCodecContext *avctx,
> - AVFrame *frame, int *got_frame,
> - AVPacket *avpkt)
> +static int filter(AVBSFContext *ctx, AVPacket *avpkt)
> {
> - Media100Context *ctx = avctx->priv_data;
> + Media100Context *s = ctx->priv_data;
> unsigned second_field_offset = 0;
> unsigned next_field = 0;
> unsigned dht_offset[2];
> @@ -83,18 +62,20 @@ static int media100_decode_frame(AVCodecContext *avctx,
> AVPacket *pkt;
> int ret;
>
> - if (avpkt->size + 1024 > ctx->pkt->size) {
> - ret = av_grow_packet(ctx->pkt, avpkt->size + 1024 - ctx->pkt->size);
> - if (ret < 0)
> - return ret;
> - }
> + ret = ff_bsf_get_packet_ref(ctx, avpkt);
> + if (ret < 0)
> + return ret;
>
> - ret = av_packet_make_writable(ctx->pkt);
> + ret = av_new_packet(s->pkt, avpkt->size + 1024);
> + if (ret < 0)
> + return ret;
> +
> + ret = av_packet_make_writable(s->pkt);
> if (ret < 0)
> return ret;
>
> bytestream2_init(&gb, avpkt->data, avpkt->size);
> - bytestream2_init_writer(&pb, ctx->pkt->data, ctx->pkt->size);
> + bytestream2_init_writer(&pb, s->pkt->data, s->pkt->size);
>
> second_field:
> bytestream2_put_be32(&pb, 0);
> @@ -107,8 +88,8 @@ second_field:
> sof_offset[field] = bytestream2_tell_p(&pb);
> bytestream2_put_be16(&pb, 17);
> bytestream2_put_byte(&pb, 8);
> - bytestream2_put_be16(&pb, avctx->height / 2);
> - bytestream2_put_be16(&pb, avctx->width);
> + bytestream2_put_be16(&pb, ctx->par_in->height / 2);
> + bytestream2_put_be16(&pb, ctx->par_in->width);
> bytestream2_put_byte(&pb, 3);
> bytestream2_put_byte(&pb, 1);
> bytestream2_put_byte(&pb, 0x21);
> @@ -164,7 +145,7 @@ second_field:
> goto second_field;
> }
>
> - pkt = ctx->pkt;
> + pkt = s->pkt;
>
> AV_WB32(pkt->data + 8, second_field_offset);
> AV_WB32(pkt->data + 12, second_field_offset);
> @@ -186,40 +167,33 @@ second_field:
>
> pkt->size = bytestream2_tell_p(&pb);
>
> - ret = avcodec_send_packet(ctx->avctx, pkt);
> - if (ret < 0) {
> - av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
> - return ret;
> - }
> + av_packet_copy_props(pkt, avpkt);
check the return value
A FATE test would be nice.
--
Anton Khirnov
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [FFmpeg-devel] [PATCH] add media100 bsf and use it
2023-01-31 10:18 [FFmpeg-devel] [PATCH] add media100 bsf and use it Paul B Mahol
2023-01-31 11:20 ` Andreas Rheinhardt
2023-01-31 12:48 ` Anton Khirnov
@ 2023-01-31 15:33 ` Paul B Mahol
2 siblings, 0 replies; 4+ messages in thread
From: Paul B Mahol @ 2023-01-31 15:33 UTC (permalink / raw)
To: FFmpeg development discussions and patches
[-- Attachment #1: Type: text/plain, Size: 26 bytes --]
Improved patch attached.
[-- Attachment #2: 0001-avcodec-add-media100_to_mjpegb-bitstream-filter-and-.patch --]
[-- Type: text/x-patch, Size: 17333 bytes --]
From ef7436580ce401917abab5114ff2ff8a1fdd9d61 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Tue, 31 Jan 2023 10:18:17 +0100
Subject: [PATCH] avcodec: add media100_to_mjpegb bitstream filter and use it
Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
configure | 1 +
libavcodec/Makefile | 3 +-
libavcodec/bitstream_filters.c | 1 +
libavcodec/media100.c | 224 ----------------------------
libavcodec/media100_to_mjpegb_bsf.c | 170 +++++++++++++++++++++
libavcodec/mjpegbdec.c | 15 ++
6 files changed, 189 insertions(+), 225 deletions(-)
delete mode 100644 libavcodec/media100.c
create mode 100644 libavcodec/media100_to_mjpegb_bsf.c
diff --git a/configure b/configure
index 47790d10f5..174ae5c894 100755
--- a/configure
+++ b/configure
@@ -2850,6 +2850,7 @@ lscr_decoder_select="inflate_wrapper"
magicyuv_decoder_select="llviddsp"
magicyuv_encoder_select="llvidencdsp"
mdec_decoder_select="blockdsp bswapdsp idctdsp"
+media100_decoder_select="media100_to_mjpegb_bsf"
metasound_decoder_select="lsp sinewin"
mimic_decoder_select="blockdsp bswapdsp hpeldsp idctdsp"
mjpeg_decoder_select="blockdsp hpeldsp exif idctdsp jpegtables"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index df76d37598..4971832ff4 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -485,7 +485,7 @@ OBJS-$(CONFIG_MACE6_DECODER) += mace.o
OBJS-$(CONFIG_MAGICYUV_DECODER) += magicyuv.o
OBJS-$(CONFIG_MAGICYUV_ENCODER) += magicyuvenc.o
OBJS-$(CONFIG_MDEC_DECODER) += mdec.o mpeg12.o mpeg12data.o
-OBJS-$(CONFIG_MEDIA100_DECODER) += media100.o
+OBJS-$(CONFIG_MEDIA100_DECODER) += mjpegbdec.o
OBJS-$(CONFIG_METASOUND_DECODER) += metasound.o twinvq.o
OBJS-$(CONFIG_MICRODVD_DECODER) += microdvddec.o ass.o
OBJS-$(CONFIG_MIMIC_DECODER) += mimic.o
@@ -1221,6 +1221,7 @@ OBJS-$(CONFIG_HEVC_METADATA_BSF) += h265_metadata_bsf.o h265_profile_le
h2645data.o
OBJS-$(CONFIG_HEVC_MP4TOANNEXB_BSF) += hevc_mp4toannexb_bsf.o
OBJS-$(CONFIG_IMX_DUMP_HEADER_BSF) += imx_dump_header_bsf.o
+OBJS-$(CONFIG_MEDIA100_TO_MJPEGB_BSF) += media100_to_mjpegb_bsf.o
OBJS-$(CONFIG_MJPEG2JPEG_BSF) += mjpeg2jpeg_bsf.o
OBJS-$(CONFIG_MJPEGA_DUMP_HEADER_BSF) += mjpega_dump_header_bsf.o
OBJS-$(CONFIG_MPEG4_UNPACK_BFRAMES_BSF) += mpeg4_unpack_bframes_bsf.o
diff --git a/libavcodec/bitstream_filters.c b/libavcodec/bitstream_filters.c
index a3bebefe5f..e8216819ca 100644
--- a/libavcodec/bitstream_filters.c
+++ b/libavcodec/bitstream_filters.c
@@ -43,6 +43,7 @@ extern const FFBitStreamFilter ff_hapqa_extract_bsf;
extern const FFBitStreamFilter ff_hevc_metadata_bsf;
extern const FFBitStreamFilter ff_hevc_mp4toannexb_bsf;
extern const FFBitStreamFilter ff_imx_dump_header_bsf;
+extern const FFBitStreamFilter ff_media100_to_mjpegb_bsf;
extern const FFBitStreamFilter ff_mjpeg2jpeg_bsf;
extern const FFBitStreamFilter ff_mjpega_dump_header_bsf;
extern const FFBitStreamFilter ff_mp3_header_decompress_bsf;
diff --git a/libavcodec/media100.c b/libavcodec/media100.c
deleted file mode 100644
index fdfce2cac1..0000000000
--- a/libavcodec/media100.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * Media 100 decoder
- * Copyright (c) 2022 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
- */
-
-/**
- * @file
- * Media 100 decoder.
- */
-
-#include <inttypes.h>
-
-#include "libavutil/intreadwrite.h"
-#include "avcodec.h"
-#include "bytestream.h"
-#include "codec_internal.h"
-
-typedef struct Media100Context {
- AVCodecContext *avctx; // wrapper context for mjpegb
- AVPacket *pkt;
-} Media100Context;
-
-static av_cold int media100_decode_init(AVCodecContext *avctx)
-{
- Media100Context *ctx = avctx->priv_data;
- const AVCodec *codec;
- int ret;
-
- codec = avcodec_find_decoder(AV_CODEC_ID_MJPEGB);
- if (!codec)
- return AVERROR_BUG;
- ctx->avctx = avcodec_alloc_context3(codec);
- if (!ctx->avctx)
- return AVERROR(ENOMEM);
- ctx->avctx->thread_count = 1;
- ctx->avctx->flags = avctx->flags;
- ctx->avctx->flags2 = avctx->flags2;
- ctx->avctx->width = ctx->avctx->coded_width = avctx->width;
- ctx->avctx->height = ctx->avctx->coded_height = avctx->height;
-
- ret = avcodec_open2(ctx->avctx, codec, NULL);
- if (ret < 0)
- return ret;
-
- ctx->pkt = av_packet_alloc();
- if (!ctx->pkt)
- return AVERROR(ENOMEM);
-
- return 0;
-}
-
-static int media100_decode_frame(AVCodecContext *avctx,
- AVFrame *frame, int *got_frame,
- AVPacket *avpkt)
-{
- Media100Context *ctx = avctx->priv_data;
- unsigned second_field_offset = 0;
- unsigned next_field = 0;
- unsigned dht_offset[2];
- unsigned dqt_offset[2];
- unsigned sod_offset[2];
- unsigned sof_offset[2];
- unsigned sos_offset[2];
- unsigned field = 0;
- GetByteContext gb;
- PutByteContext pb;
- AVPacket *pkt;
- int ret;
-
- if (avpkt->size + 1024 > ctx->pkt->size) {
- ret = av_grow_packet(ctx->pkt, avpkt->size + 1024 - ctx->pkt->size);
- if (ret < 0)
- return ret;
- }
-
- ret = av_packet_make_writable(ctx->pkt);
- if (ret < 0)
- return ret;
-
- bytestream2_init(&gb, avpkt->data, avpkt->size);
- bytestream2_init_writer(&pb, ctx->pkt->data, ctx->pkt->size);
-
-second_field:
- bytestream2_put_be32(&pb, 0);
- bytestream2_put_be32(&pb, AV_RB32("mjpg"));
- bytestream2_put_be32(&pb, 0);
- bytestream2_put_be32(&pb, 0);
- for (int i = 0; i < 6; i++)
- bytestream2_put_be32(&pb, 0);
-
- sof_offset[field] = bytestream2_tell_p(&pb);
- bytestream2_put_be16(&pb, 17);
- bytestream2_put_byte(&pb, 8);
- bytestream2_put_be16(&pb, avctx->height / 2);
- bytestream2_put_be16(&pb, avctx->width);
- bytestream2_put_byte(&pb, 3);
- bytestream2_put_byte(&pb, 1);
- bytestream2_put_byte(&pb, 0x21);
- bytestream2_put_byte(&pb, 0);
- bytestream2_put_byte(&pb, 2);
- bytestream2_put_byte(&pb, 0x11);
- bytestream2_put_byte(&pb, 1);
- bytestream2_put_byte(&pb, 3);
- bytestream2_put_byte(&pb, 0x11);
- bytestream2_put_byte(&pb, 1);
-
- sos_offset[field] = bytestream2_tell_p(&pb);
- bytestream2_put_be16(&pb, 12);
- bytestream2_put_byte(&pb, 3);
- bytestream2_put_byte(&pb, 1);
- bytestream2_put_byte(&pb, 0);
- bytestream2_put_byte(&pb, 2);
- bytestream2_put_byte(&pb, 0x11);
- bytestream2_put_byte(&pb, 3);
- bytestream2_put_byte(&pb, 0x11);
- bytestream2_put_byte(&pb, 0);
- bytestream2_put_byte(&pb, 0);
- bytestream2_put_byte(&pb, 0);
-
- dqt_offset[field] = bytestream2_tell_p(&pb);
- bytestream2_put_be16(&pb, 132);
- bytestream2_put_byte(&pb, 0);
- bytestream2_skip(&gb, 4);
- for (int i = 0; i < 64; i++)
- bytestream2_put_byte(&pb, bytestream2_get_be32(&gb));
- bytestream2_put_byte(&pb, 1);
- for (int i = 0; i < 64; i++)
- bytestream2_put_byte(&pb, bytestream2_get_be32(&gb));
-
- dht_offset[field] = 0;
- sod_offset[field] = bytestream2_tell_p(&pb);
-
- for (int i = bytestream2_tell(&gb) + 8; next_field == 0 && i < avpkt->size - 4; i++) {
- if (AV_RB32(avpkt->data + i) == 0x00000001) {
- next_field = i;
- break;
- }
- }
-
- bytestream2_skip(&gb, 8);
- bytestream2_copy_buffer(&pb, &gb, next_field - bytestream2_tell(&gb));
- bytestream2_put_be64(&pb, 0);
-
- if (field == 0) {
- field = 1;
- second_field_offset = bytestream2_tell_p(&pb);
- next_field = avpkt->size;
- goto second_field;
- }
-
- pkt = ctx->pkt;
-
- AV_WB32(pkt->data + 8, second_field_offset);
- AV_WB32(pkt->data + 12, second_field_offset);
- AV_WB32(pkt->data + 16, second_field_offset);
- AV_WB32(pkt->data + 20, dqt_offset[0]);
- AV_WB32(pkt->data + 24, dht_offset[0]);
- AV_WB32(pkt->data + 28, sof_offset[0]);
- AV_WB32(pkt->data + 32, sos_offset[0]);
- AV_WB32(pkt->data + 36, sod_offset[0]);
-
- AV_WB32(pkt->data + second_field_offset + 8, bytestream2_tell_p(&pb) - second_field_offset);
- AV_WB32(pkt->data + second_field_offset + 12, bytestream2_tell_p(&pb) - second_field_offset);
- AV_WB32(pkt->data + second_field_offset + 16, 0);
- AV_WB32(pkt->data + second_field_offset + 20, dqt_offset[1] - second_field_offset);
- AV_WB32(pkt->data + second_field_offset + 24, dht_offset[1]);
- AV_WB32(pkt->data + second_field_offset + 28, sof_offset[1] - second_field_offset);
- AV_WB32(pkt->data + second_field_offset + 32, sos_offset[1] - second_field_offset);
- AV_WB32(pkt->data + second_field_offset + 36, sod_offset[1] - second_field_offset);
-
- pkt->size = bytestream2_tell_p(&pb);
-
- ret = avcodec_send_packet(ctx->avctx, pkt);
- if (ret < 0) {
- av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
- return ret;
- }
-
- ret = avcodec_receive_frame(ctx->avctx, frame);
- if (ret < 0)
- return ret;
-
- *got_frame = 1;
-
- return avpkt->size;
-}
-
-static av_cold int media100_decode_end(AVCodecContext *avctx)
-{
- Media100Context *ctx = avctx->priv_data;
-
- avcodec_free_context(&ctx->avctx);
- av_packet_free(&ctx->pkt);
-
- return 0;
-}
-
-const FFCodec ff_media100_decoder = {
- .p.name = "media100",
- CODEC_LONG_NAME("Media 100"),
- .p.type = AVMEDIA_TYPE_VIDEO,
- .p.id = AV_CODEC_ID_MEDIA100,
- .priv_data_size = sizeof(Media100Context),
- .init = media100_decode_init,
- .close = media100_decode_end,
- FF_CODEC_DECODE_CB(media100_decode_frame),
- .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
-};
diff --git a/libavcodec/media100_to_mjpegb_bsf.c b/libavcodec/media100_to_mjpegb_bsf.c
new file mode 100644
index 0000000000..c262f4455f
--- /dev/null
+++ b/libavcodec/media100_to_mjpegb_bsf.c
@@ -0,0 +1,170 @@
+/*
+ * Media 100 to MJPEGB bitstream filter
+ * Copyright (c) 2023 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
+ */
+
+/**
+ * @file
+ * Media 100 to MJPEGB bitstream filter.
+ */
+
+#include <inttypes.h>
+
+#include "bsf.h"
+#include "bsf_internal.h"
+#include "libavutil/intreadwrite.h"
+#include "bytestream.h"
+
+static av_cold int init(AVBSFContext *ctx)
+{
+ ctx->par_out->codec_id = AV_CODEC_ID_MJPEGB;
+ return 0;
+}
+
+static int filter(AVBSFContext *ctx, AVPacket *out)
+{
+ unsigned second_field_offset = 0;
+ unsigned next_field = 0;
+ unsigned dht_offset[2];
+ unsigned dqt_offset[2];
+ unsigned sod_offset[2];
+ unsigned sof_offset[2];
+ unsigned sos_offset[2];
+ unsigned field = 0;
+ GetByteContext gb;
+ PutByteContext pb;
+ AVPacket *in;
+ int ret;
+
+ ret = ff_bsf_get_packet(ctx, &in);
+ if (ret < 0)
+ return ret;
+
+ ret = av_new_packet(out, in->size + 1024);
+ if (ret < 0)
+ return ret;
+
+ bytestream2_init(&gb, in->data, in->size);
+ bytestream2_init_writer(&pb, out->data, out->size);
+
+second_field:
+ bytestream2_put_be32(&pb, 0);
+ bytestream2_put_be32(&pb, AV_RB32("mjpg"));
+ bytestream2_put_be32(&pb, 0);
+ bytestream2_put_be32(&pb, 0);
+ for (int i = 0; i < 6; i++)
+ bytestream2_put_be32(&pb, 0);
+
+ sof_offset[field] = bytestream2_tell_p(&pb);
+ bytestream2_put_be16(&pb, 17);
+ bytestream2_put_byte(&pb, 8);
+ bytestream2_put_be16(&pb, ctx->par_in->height / 2);
+ bytestream2_put_be16(&pb, ctx->par_in->width);
+ bytestream2_put_byte(&pb, 3);
+ bytestream2_put_byte(&pb, 1);
+ bytestream2_put_byte(&pb, 0x21);
+ bytestream2_put_byte(&pb, 0);
+ bytestream2_put_byte(&pb, 2);
+ bytestream2_put_byte(&pb, 0x11);
+ bytestream2_put_byte(&pb, 1);
+ bytestream2_put_byte(&pb, 3);
+ bytestream2_put_byte(&pb, 0x11);
+ bytestream2_put_byte(&pb, 1);
+
+ sos_offset[field] = bytestream2_tell_p(&pb);
+ bytestream2_put_be16(&pb, 12);
+ bytestream2_put_byte(&pb, 3);
+ bytestream2_put_byte(&pb, 1);
+ bytestream2_put_byte(&pb, 0);
+ bytestream2_put_byte(&pb, 2);
+ bytestream2_put_byte(&pb, 0x11);
+ bytestream2_put_byte(&pb, 3);
+ bytestream2_put_byte(&pb, 0x11);
+ bytestream2_put_byte(&pb, 0);
+ bytestream2_put_byte(&pb, 0);
+ bytestream2_put_byte(&pb, 0);
+
+ dqt_offset[field] = bytestream2_tell_p(&pb);
+ bytestream2_put_be16(&pb, 132);
+ bytestream2_put_byte(&pb, 0);
+ bytestream2_skip(&gb, 4);
+ for (int i = 0; i < 64; i++)
+ bytestream2_put_byte(&pb, bytestream2_get_be32(&gb));
+ bytestream2_put_byte(&pb, 1);
+ for (int i = 0; i < 64; i++)
+ bytestream2_put_byte(&pb, bytestream2_get_be32(&gb));
+
+ dht_offset[field] = 0;
+ sod_offset[field] = bytestream2_tell_p(&pb);
+
+ for (int i = bytestream2_tell(&gb) + 8; next_field == 0 && i < in->size - 4; i++) {
+ if (AV_RB32(in->data + i) == 0x00000001) {
+ next_field = i;
+ break;
+ }
+ }
+
+ bytestream2_skip(&gb, 8);
+ bytestream2_copy_buffer(&pb, &gb, next_field - bytestream2_tell(&gb));
+ bytestream2_put_be64(&pb, 0);
+
+ if (field == 0) {
+ field = 1;
+ second_field_offset = bytestream2_tell_p(&pb);
+ next_field = in->size;
+ goto second_field;
+ }
+
+ AV_WB32(out->data + 8, second_field_offset);
+ AV_WB32(out->data + 12, second_field_offset);
+ AV_WB32(out->data + 16, second_field_offset);
+ AV_WB32(out->data + 20, dqt_offset[0]);
+ AV_WB32(out->data + 24, dht_offset[0]);
+ AV_WB32(out->data + 28, sof_offset[0]);
+ AV_WB32(out->data + 32, sos_offset[0]);
+ AV_WB32(out->data + 36, sod_offset[0]);
+
+ AV_WB32(out->data + second_field_offset + 8, bytestream2_tell_p(&pb) - second_field_offset);
+ AV_WB32(out->data + second_field_offset + 12, bytestream2_tell_p(&pb) - second_field_offset);
+ AV_WB32(out->data + second_field_offset + 16, 0);
+ AV_WB32(out->data + second_field_offset + 20, dqt_offset[1] - second_field_offset);
+ AV_WB32(out->data + second_field_offset + 24, dht_offset[1]);
+ AV_WB32(out->data + second_field_offset + 28, sof_offset[1] - second_field_offset);
+ AV_WB32(out->data + second_field_offset + 32, sos_offset[1] - second_field_offset);
+ AV_WB32(out->data + second_field_offset + 36, sod_offset[1] - second_field_offset);
+
+ out->size = bytestream2_tell_p(&pb);
+
+ ret = av_packet_copy_props(out, in);
+ if (ret < 0)
+ goto fail;
+
+fail:
+ if (ret < 0)
+ av_packet_unref(out);
+ av_packet_free(&in);
+ return ret;
+}
+
+const FFBitStreamFilter ff_media100_to_mjpegb_bsf = {
+ .p.name = "media100_to_mjpegb",
+ .p.codec_ids = (const enum AVCodecID []){ AV_CODEC_ID_MEDIA100, AV_CODEC_ID_NONE },
+ .init = init,
+ .filter = filter,
+};
diff --git a/libavcodec/mjpegbdec.c b/libavcodec/mjpegbdec.c
index 6d422e7a29..4db1d9a89d 100644
--- a/libavcodec/mjpegbdec.c
+++ b/libavcodec/mjpegbdec.c
@@ -168,3 +168,18 @@ const FFCodec ff_mjpegb_decoder = {
.p.max_lowres = 3,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
+
+const FFCodec ff_media100_decoder = {
+ .p.name = "media100",
+ CODEC_LONG_NAME("Media 100"),
+ .p.type = AVMEDIA_TYPE_VIDEO,
+ .p.id = AV_CODEC_ID_MEDIA100,
+ .priv_data_size = sizeof(MJpegDecodeContext),
+ .init = ff_mjpeg_decode_init,
+ .close = ff_mjpeg_decode_end,
+ FF_CODEC_DECODE_CB(mjpegb_decode_frame),
+ .p.capabilities = AV_CODEC_CAP_DR1,
+ .p.max_lowres = 3,
+ .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
+ .bsfs = "media100_to_mjpegb",
+};
--
2.39.1
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