diff mbox series

[FFmpeg-devel,RFC,GSoC,v1,1/6] avformat/abr: Adaptive Bitrate support

Message ID 20200715083733.101880-1-sj.hc_Zhong@sjtu.edu.cn
State Superseded
Headers show
Series [FFmpeg-devel,RFC,GSoC,v1,1/6] avformat/abr: Adaptive Bitrate support
Related show

Checks

Context Check Description
andriy/default pending
andriy/make fail Make failed

Commit Message

Hongcheng Zhong July 15, 2020, 8:37 a.m. UTC
From: spartazhc <spartazhc@gmail.com>

Add abr module for hls/dash.

v1 fixed:
1. add an "ff" prefix to the protocol name to mark it internal.
2. use 1.2f for float constant 1.2.
3. simplify abr_seek for we just need AVSEEK_SIZE only.

Signed-off-by: spartazhc <spartazhc@gmail.com>
---
 doc/protocols.texi      |   7 ++
 libavformat/Makefile    |   1 +
 libavformat/abr.c       | 250 ++++++++++++++++++++++++++++++++++++++++
 libavformat/protocols.c |   1 +
 4 files changed, 259 insertions(+)
 create mode 100644 libavformat/abr.c

Comments

Steven Liu July 15, 2020, 9:15 a.m. UTC | #1
Hongcheng Zhong <sj.hc_Zhong@sjtu.edu.cn> 于2020年7月15日周三 下午4:37写道:
>
> From: spartazhc <spartazhc@gmail.com>
>
> Add abr module for hls/dash.
>
> v1 fixed:
> 1. add an "ff" prefix to the protocol name to mark it internal.
> 2. use 1.2f for float constant 1.2.
> 3. simplify abr_seek for we just need AVSEEK_SIZE only.
>
> Signed-off-by: spartazhc <spartazhc@gmail.com>
> ---
>  doc/protocols.texi      |   7 ++
>  libavformat/Makefile    |   1 +
>  libavformat/abr.c       | 250 ++++++++++++++++++++++++++++++++++++++++
>  libavformat/protocols.c |   1 +
>  4 files changed, 259 insertions(+)
>  create mode 100644 libavformat/abr.c
>
> diff --git a/doc/protocols.texi b/doc/protocols.texi
> index 64ad3f05d6..ffbb36147e 100644
> --- a/doc/protocols.texi
> +++ b/doc/protocols.texi
> @@ -51,6 +51,13 @@ in microseconds.
>
>  A description of the currently available protocols follows.
>
> +@section abr
> +
> +Adaptive bitrate sub-protocol work for hls/dash.
> +
> +The abr protocol takes stream information from hls/dash as input,
> +use bandwidth estimation to decide whether to switch or not.
> +
>  @section amqp
>
>  Advanced Message Queueing Protocol (AMQP) version 0-9-1 is a broker based
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index 26af859a28..3c08289d5e 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -588,6 +588,7 @@ OBJS-$(CONFIG_LIBOPENMPT_DEMUXER)        += libopenmpt.o
>  OBJS-$(CONFIG_VAPOURSYNTH_DEMUXER)       += vapoursynth.o
>
>  # protocols I/O
> +OBJS-$(CONFIG_ABR_PROTOCOL)              += abr.o
>  OBJS-$(CONFIG_ASYNC_PROTOCOL)            += async.o
>  OBJS-$(CONFIG_APPLEHTTP_PROTOCOL)        += hlsproto.o
>  OBJS-$(CONFIG_BLURAY_PROTOCOL)           += bluray.o
> diff --git a/libavformat/abr.c b/libavformat/abr.c
> new file mode 100644
> index 0000000000..e201d3edda
> --- /dev/null
> +++ b/libavformat/abr.c
> @@ -0,0 +1,250 @@
> +/*
> + * Adaptive Bitrate Module for HLS / DASH
> + * Copyright (c) 2020 Hongcheng Zhong
> + *
> + * 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 "libavutil/opt.h"
> +#include "libavutil/time.h"
> +#include "libavutil/avstring.h"
> +#include "url.h"
> +#include <math.h>
> +
> +enum ABRFormatType {
> +    ABR_TYPE_HLS,
> +    ABR_TYPE_DASH
> +};
> +
> +typedef struct variant_bitrate {
> +    int value;
> +    int index;
> +} variant_bitrate;
> +
> +typedef struct ABRContext {
> +    AVClass *class;
> +    URLContext *hd;
> +    AVDictionary *abr_params;
> +    AVDictionary *abr_metadata;
> +    enum ABRFormatType format;
> +    int cur_pls;
> +    int can_switch;
> +    int n_variants;
> +    variant_bitrate *variants_bitrate;
> +    int index;
> +    int n_throughputs;
> +    float *throughputs;
> +} ABRContext;
> +
> +static float harmonic_mean(int num, float* arr)
> +{
> +    float tmp = 0;
> +
> +    if (num <= 0) return 0;
> +
> +    for (size_t i = 0; i < num; i++) {
> +        tmp += 1 / arr[i];
> +    }
> +
> +    return num / tmp;
> +}
> +
> +static int hls_param_parse(ABRContext *c, const char *key, const char *value)
> +{
> +    if (!av_strcasecmp(key, "cur_pls")) {
> +        c->cur_pls = atoi(value);
maybe need check return atoi(value)? can the value be not a number or
check the value is a number?
> +    } else if (!av_strcasecmp(key, "can_switch")) {
> +        c->can_switch = atoi(value);
> +    } else if (!av_strcasecmp(key, "n_variants")) {
> +        c->n_variants = atoi(value);
> +        c->variants_bitrate = av_mallocz(sizeof(variant_bitrate) * c->n_variants);
> +        if (!c->variants_bitrate)
> +            return -1;
What about AVERROR(EINVAL); ?
> +    } else if (av_strstart(key, "variant_bitrate", NULL)) {
> +        c->variants_bitrate[c->index].value = atoi(value);
> +        c->variants_bitrate[c->index].index = c->index;
> +        c->index++;
> +    } else if (!av_strcasecmp(key, "n_throughputs")) {
> +        c->n_throughputs = atoi(value);
> +        c->index = 0;
> +        if (c->n_throughputs > 0) {
> +            c->throughputs = av_malloc(sizeof(float) * c->n_throughputs);
> +            if (!c->throughputs)
> +                return -1;
What about AVERROR(ENOMEM);?
> +        }
> +    } else if (av_strstart(key, "throughputs", NULL))
> +        c->throughputs[c->index++] = atof(value);
> +    return 0;
> +}
> +
> +static int dash_param_parse(ABRContext *c, const char *key, const char *value)
> +{
> +    return 0;
> +}
> +
> +static int abr_param_parse(ABRContext *c, enum ABRFormatType type, const char *key, const char *value)
> +{
> +    if (type == ABR_TYPE_HLS) {
> +        hls_param_parse(c, key, value);
> +    } else if (type == ABR_TYPE_DASH) {
> +        dash_param_parse(c, key, value);
> +    }
> +    return 0;
> +}
> +
> +static int compare_vb(const void *a, const void *b)
> +{
> +    variant_bitrate *a1 = (variant_bitrate *)a;
> +    variant_bitrate *a2 = (variant_bitrate *)b;
> +    return (*a2).value - (*a1).value;
> +}
> +
> +static int abr_rule(ABRContext *c, float bw_estimate)
> +{
> +    int ret = -1;
> +
> +    if (c->n_throughputs > 6) {
> +        if (bw_estimate < c->variants_bitrate[c->cur_pls].value / 1000 * 1.2f &&
> +            bw_estimate > c->variants_bitrate[c->cur_pls].value / 1000 * 0.8f)
> +            return -1;
shoud it return AVERROR(EINVAL)?
> +        qsort(c->variants_bitrate, c->n_variants, sizeof(variant_bitrate), compare_vb);
> +        for (int i = 0; i < c->n_variants; i++) {
> +            if (bw_estimate > c->variants_bitrate[i].value / 1000) {
> +                ret = i;
> +                break;
> +            }
> +        }
> +    }
> +    if (ret == c->cur_pls)
> +        ret = -1;
> +    av_log(c, AV_LOG_VERBOSE, "[switch] bwe=%.2fkbps, cur=%d, switch=%d\n", bw_estimate, c->cur_pls, ret);
> +    return ret;
> +}
> +
> +static int abr_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
> +{
> +    const char *nested_url;
> +    uint64_t start, end;
> +    float bw_estimation;
> +    int switch_request = -1;
> +    int ret = 0;
> +    ABRContext *c = h->priv_data;
> +
> +    if (!av_strstart(uri, "ffabr+", &nested_url) &&
> +        !av_strstart(uri, "ffabr:", &nested_url)) {
> +        av_log(h, AV_LOG_ERROR, "Unsupported url %s\n", uri);
> +        ret = AVERROR(EINVAL);
> +        goto err;
> +    }
> +
> +    AVDictionaryEntry *en = NULL;
> +    en = av_dict_get(c->abr_params, "", en, AV_DICT_IGNORE_SUFFIX);
> +    if (!en)
> +        return -1;
> +    if (!av_strcasecmp(en->key, "format")) {
> +        if (!av_strcasecmp(en->value, "hls")) {
> +            c->format = ABR_TYPE_HLS;
> +        } else if (!av_strcasecmp(en->value, "dash")) {
> +            c->format = ABR_TYPE_DASH;
> +        }
> +        av_log(h, AV_LOG_VERBOSE, "%s is using ABR\n", en->value);
> +    }
> +
> +    while (en = av_dict_get(c->abr_params, "", en, AV_DICT_IGNORE_SUFFIX)) {
> +        if (abr_param_parse(c, c->format, en->key, en->value) < 0)
> +            av_log(h, AV_LOG_WARNING,"Error parsing option '%s = %s'.\n",
> +                    en->key, en->value);
> +    }
> +
> +    start = av_gettime();
> +    if ((ret = ffurl_open_whitelist(&c->hd, nested_url, flags,
> +                                    &h->interrupt_callback, options,
> +                                    h->protocol_whitelist, h->protocol_blacklist, h)) < 0) {
> +        av_log(h, AV_LOG_ERROR, "Unable to open resource: %s\n", nested_url);
> +        goto err;
> +    }
> +    end = av_gettime();
> +
> +    bw_estimation = harmonic_mean(c->n_throughputs, c->throughputs);
> +
> +    if (c->can_switch == 1)
> +        switch_request = abr_rule(c, bw_estimation);
> +
> +    av_dict_set_int(&c->abr_metadata, "download_time", (end - start), 0);
> +    av_dict_set_int(&c->abr_metadata, "switch_request", switch_request, 0);
> +
> +err:
> +    return ret;
> +}
> +
> +
> +static int abr_read(URLContext *h, uint8_t *buf, int size)
> +{
> +    ABRContext *c = h->priv_data;
> +
> +    return ffurl_read(c->hd, buf, size);
> +}
> +
> +static int64_t abr_seek(URLContext *h, int64_t pos, int whence)
> +{
> +    ABRContext *c = h->priv_data;
> +    int64_t ret;
> +
> +    if (whence == AVSEEK_SIZE) {
> +        ret = ffurl_seek(c->hd, pos, AVSEEK_SIZE);
> +        return ret < 0 ? AVERROR(errno) : ret;
> +    }
what about return ffurl_seek(c->hd, pos, AVSEEK_SIZE); ?
> +
> +    return AVERROR(errno);
if use return ffurl_seek(c->hd, pos, AVSEEK_SIZE);, this line should be removed.
> +}
> +
> +static int abr_close(URLContext *h)
> +{
> +    ABRContext *c = h->priv_data;
> +    int ret = 0;
> +
> +    ffurl_closep(&c->hd);
> +    av_free(c->variants_bitrate);
> +    av_free(c->throughputs);
> +    return ret;
> +}
> +
> +#define OFFSET(x) offsetof(ABRContext, x)
> +#define D AV_OPT_FLAG_DECODING_PARAM
> +static const AVOption ffabr_options[] = {
> +    { "abr-params",  "Informations ABR needed, using a :-separated list of key=value parameters", OFFSET(abr_params), AV_OPT_TYPE_DICT, { 0 }, 0, 0, D },
> +    { "abr-metadata",  "Metadata return from abr, including switch signal and network bandwidth", OFFSET(abr_metadata), AV_OPT_TYPE_DICT, { 0 }, 0, 0, D },
> +    { NULL }
> +};
> +
> +static const AVClass ffabr_class = {
> +    .class_name     = "ffabr",
> +    .item_name      = av_default_item_name,
> +    .option         = ffabr_options,
> +    .version        = LIBAVUTIL_VERSION_INT,
> +};
> +
> +const URLProtocol ff_ffabr_protocol = {
> +    .name                = "ffabr",
> +    .url_open2           = abr_open,
> +    .url_read            = abr_read,
> +    .url_seek            = abr_seek,
> +    .url_close           = abr_close,
> +    .priv_data_size      = sizeof(ABRContext),
> +    .priv_data_class     = &ffabr_class,
> +};
> diff --git a/libavformat/protocols.c b/libavformat/protocols.c
> index 7df18fbb3b..1d6af8e380 100644
> --- a/libavformat/protocols.c
> +++ b/libavformat/protocols.c
> @@ -29,6 +29,7 @@ extern const URLProtocol ff_cache_protocol;
>  extern const URLProtocol ff_concat_protocol;
>  extern const URLProtocol ff_crypto_protocol;
>  extern const URLProtocol ff_data_protocol;
> +extern const URLProtocol ff_ffabr_protocol;
>  extern const URLProtocol ff_ffrtmpcrypt_protocol;
>  extern const URLProtocol ff_ffrtmphttp_protocol;
>  extern const URLProtocol ff_file_protocol;
> --
> 2.27.0
>

Thanks
Steven
diff mbox series

Patch

diff --git a/doc/protocols.texi b/doc/protocols.texi
index 64ad3f05d6..ffbb36147e 100644
--- a/doc/protocols.texi
+++ b/doc/protocols.texi
@@ -51,6 +51,13 @@  in microseconds.
 
 A description of the currently available protocols follows.
 
+@section abr
+
+Adaptive bitrate sub-protocol work for hls/dash.
+
+The abr protocol takes stream information from hls/dash as input,
+use bandwidth estimation to decide whether to switch or not.
+
 @section amqp
 
 Advanced Message Queueing Protocol (AMQP) version 0-9-1 is a broker based
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 26af859a28..3c08289d5e 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -588,6 +588,7 @@  OBJS-$(CONFIG_LIBOPENMPT_DEMUXER)        += libopenmpt.o
 OBJS-$(CONFIG_VAPOURSYNTH_DEMUXER)       += vapoursynth.o
 
 # protocols I/O
+OBJS-$(CONFIG_ABR_PROTOCOL)              += abr.o
 OBJS-$(CONFIG_ASYNC_PROTOCOL)            += async.o
 OBJS-$(CONFIG_APPLEHTTP_PROTOCOL)        += hlsproto.o
 OBJS-$(CONFIG_BLURAY_PROTOCOL)           += bluray.o
diff --git a/libavformat/abr.c b/libavformat/abr.c
new file mode 100644
index 0000000000..e201d3edda
--- /dev/null
+++ b/libavformat/abr.c
@@ -0,0 +1,250 @@ 
+/*
+ * Adaptive Bitrate Module for HLS / DASH
+ * Copyright (c) 2020 Hongcheng Zhong
+ *
+ * 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 "libavutil/opt.h"
+#include "libavutil/time.h"
+#include "libavutil/avstring.h"
+#include "url.h"
+#include <math.h>
+
+enum ABRFormatType {
+    ABR_TYPE_HLS,
+    ABR_TYPE_DASH
+};
+
+typedef struct variant_bitrate {
+    int value;
+    int index;
+} variant_bitrate;
+
+typedef struct ABRContext {
+    AVClass *class;
+    URLContext *hd;
+    AVDictionary *abr_params;
+    AVDictionary *abr_metadata;
+    enum ABRFormatType format;
+    int cur_pls;
+    int can_switch;
+    int n_variants;
+    variant_bitrate *variants_bitrate;
+    int index;
+    int n_throughputs;
+    float *throughputs;
+} ABRContext;
+
+static float harmonic_mean(int num, float* arr)
+{
+    float tmp = 0;
+
+    if (num <= 0) return 0;
+
+    for (size_t i = 0; i < num; i++) {
+        tmp += 1 / arr[i];
+    }
+
+    return num / tmp;
+}
+
+static int hls_param_parse(ABRContext *c, const char *key, const char *value)
+{
+    if (!av_strcasecmp(key, "cur_pls")) {
+        c->cur_pls = atoi(value);
+    } else if (!av_strcasecmp(key, "can_switch")) {
+        c->can_switch = atoi(value);
+    } else if (!av_strcasecmp(key, "n_variants")) {
+        c->n_variants = atoi(value);
+        c->variants_bitrate = av_mallocz(sizeof(variant_bitrate) * c->n_variants);
+        if (!c->variants_bitrate)
+            return -1;
+    } else if (av_strstart(key, "variant_bitrate", NULL)) {
+        c->variants_bitrate[c->index].value = atoi(value);
+        c->variants_bitrate[c->index].index = c->index;
+        c->index++;
+    } else if (!av_strcasecmp(key, "n_throughputs")) {
+        c->n_throughputs = atoi(value);
+        c->index = 0;
+        if (c->n_throughputs > 0) {
+            c->throughputs = av_malloc(sizeof(float) * c->n_throughputs);
+            if (!c->throughputs)
+                return -1;
+        }
+    } else if (av_strstart(key, "throughputs", NULL))
+        c->throughputs[c->index++] = atof(value);
+    return 0;
+}
+
+static int dash_param_parse(ABRContext *c, const char *key, const char *value)
+{
+    return 0;
+}
+
+static int abr_param_parse(ABRContext *c, enum ABRFormatType type, const char *key, const char *value)
+{
+    if (type == ABR_TYPE_HLS) {
+        hls_param_parse(c, key, value);
+    } else if (type == ABR_TYPE_DASH) {
+        dash_param_parse(c, key, value);
+    }
+    return 0;
+}
+
+static int compare_vb(const void *a, const void *b)
+{
+    variant_bitrate *a1 = (variant_bitrate *)a;
+    variant_bitrate *a2 = (variant_bitrate *)b;
+    return (*a2).value - (*a1).value;
+}
+
+static int abr_rule(ABRContext *c, float bw_estimate)
+{
+    int ret = -1;
+
+    if (c->n_throughputs > 6) {
+        if (bw_estimate < c->variants_bitrate[c->cur_pls].value / 1000 * 1.2f &&
+            bw_estimate > c->variants_bitrate[c->cur_pls].value / 1000 * 0.8f)
+            return -1;
+        qsort(c->variants_bitrate, c->n_variants, sizeof(variant_bitrate), compare_vb);
+        for (int i = 0; i < c->n_variants; i++) {
+            if (bw_estimate > c->variants_bitrate[i].value / 1000) {
+                ret = i;
+                break;
+            }
+        }
+    }
+    if (ret == c->cur_pls)
+        ret = -1;
+    av_log(c, AV_LOG_VERBOSE, "[switch] bwe=%.2fkbps, cur=%d, switch=%d\n", bw_estimate, c->cur_pls, ret);
+    return ret;
+}
+
+static int abr_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
+{
+    const char *nested_url;
+    uint64_t start, end;
+    float bw_estimation;
+    int switch_request = -1;
+    int ret = 0;
+    ABRContext *c = h->priv_data;
+
+    if (!av_strstart(uri, "ffabr+", &nested_url) &&
+        !av_strstart(uri, "ffabr:", &nested_url)) {
+        av_log(h, AV_LOG_ERROR, "Unsupported url %s\n", uri);
+        ret = AVERROR(EINVAL);
+        goto err;
+    }
+
+    AVDictionaryEntry *en = NULL;
+    en = av_dict_get(c->abr_params, "", en, AV_DICT_IGNORE_SUFFIX);
+    if (!en)
+        return -1;
+    if (!av_strcasecmp(en->key, "format")) {
+        if (!av_strcasecmp(en->value, "hls")) {
+            c->format = ABR_TYPE_HLS;
+        } else if (!av_strcasecmp(en->value, "dash")) {
+            c->format = ABR_TYPE_DASH;
+        }
+        av_log(h, AV_LOG_VERBOSE, "%s is using ABR\n", en->value);
+    }
+
+    while (en = av_dict_get(c->abr_params, "", en, AV_DICT_IGNORE_SUFFIX)) {
+        if (abr_param_parse(c, c->format, en->key, en->value) < 0)
+            av_log(h, AV_LOG_WARNING,"Error parsing option '%s = %s'.\n",
+                    en->key, en->value);
+    }
+
+    start = av_gettime();
+    if ((ret = ffurl_open_whitelist(&c->hd, nested_url, flags,
+                                    &h->interrupt_callback, options,
+                                    h->protocol_whitelist, h->protocol_blacklist, h)) < 0) {
+        av_log(h, AV_LOG_ERROR, "Unable to open resource: %s\n", nested_url);
+        goto err;
+    }
+    end = av_gettime();
+
+    bw_estimation = harmonic_mean(c->n_throughputs, c->throughputs);
+
+    if (c->can_switch == 1)
+        switch_request = abr_rule(c, bw_estimation);
+
+    av_dict_set_int(&c->abr_metadata, "download_time", (end - start), 0);
+    av_dict_set_int(&c->abr_metadata, "switch_request", switch_request, 0);
+
+err:
+    return ret;
+}
+
+
+static int abr_read(URLContext *h, uint8_t *buf, int size)
+{
+    ABRContext *c = h->priv_data;
+
+    return ffurl_read(c->hd, buf, size);
+}
+
+static int64_t abr_seek(URLContext *h, int64_t pos, int whence)
+{
+    ABRContext *c = h->priv_data;
+    int64_t ret;
+
+    if (whence == AVSEEK_SIZE) {
+        ret = ffurl_seek(c->hd, pos, AVSEEK_SIZE);
+        return ret < 0 ? AVERROR(errno) : ret;
+    }
+
+    return AVERROR(errno);
+}
+
+static int abr_close(URLContext *h)
+{
+    ABRContext *c = h->priv_data;
+    int ret = 0;
+
+    ffurl_closep(&c->hd);
+    av_free(c->variants_bitrate);
+    av_free(c->throughputs);
+    return ret;
+}
+
+#define OFFSET(x) offsetof(ABRContext, x)
+#define D AV_OPT_FLAG_DECODING_PARAM
+static const AVOption ffabr_options[] = {
+    { "abr-params",  "Informations ABR needed, using a :-separated list of key=value parameters", OFFSET(abr_params), AV_OPT_TYPE_DICT, { 0 }, 0, 0, D },
+    { "abr-metadata",  "Metadata return from abr, including switch signal and network bandwidth", OFFSET(abr_metadata), AV_OPT_TYPE_DICT, { 0 }, 0, 0, D },
+    { NULL }
+};
+
+static const AVClass ffabr_class = {
+    .class_name     = "ffabr",
+    .item_name      = av_default_item_name,
+    .option         = ffabr_options,
+    .version        = LIBAVUTIL_VERSION_INT,
+};
+
+const URLProtocol ff_ffabr_protocol = {
+    .name                = "ffabr",
+    .url_open2           = abr_open,
+    .url_read            = abr_read,
+    .url_seek            = abr_seek,
+    .url_close           = abr_close,
+    .priv_data_size      = sizeof(ABRContext),
+    .priv_data_class     = &ffabr_class,
+};
diff --git a/libavformat/protocols.c b/libavformat/protocols.c
index 7df18fbb3b..1d6af8e380 100644
--- a/libavformat/protocols.c
+++ b/libavformat/protocols.c
@@ -29,6 +29,7 @@  extern const URLProtocol ff_cache_protocol;
 extern const URLProtocol ff_concat_protocol;
 extern const URLProtocol ff_crypto_protocol;
 extern const URLProtocol ff_data_protocol;
+extern const URLProtocol ff_ffabr_protocol;
 extern const URLProtocol ff_ffrtmpcrypt_protocol;
 extern const URLProtocol ff_ffrtmphttp_protocol;
 extern const URLProtocol ff_file_protocol;