[FFmpeg-devel] [PATCH] avcodec/mediacodec: Add support of dynamic bitrate
Zhao Zhili
quinkblack at foxmail.com
Wed May 29 07:19:36 EEST 2024
> 在 2024年5月29日，上午5:56，Dmitrii Okunev <xaionaro at gmail.com> 写道：
>
> MediaCodec supports parameter "video-bitrate" to change the bitrate
> on fly. This commit adds capability to use it.
>
> It adds option -bitrate_ctrl_socket to the encoder which makes
> the encoder to create an UNIX socket and listen for messages
> to change the bitrate.
Thank you for your contribution. However, libavcodec as a library has a clear define of margin, IO such as socket cannot be put into libavcodec. Reconfigure bitrate should be done via libavcodec API.
>
> An example of ffmpeg execution:
>
> ffmpeg -f flv -i rtmp://0.0.0.0:1935/live/myStream -c:v hevc_mediacodec -bitrate_ctrl_socket /run/bitrate.sock -b:v 8M -f flv rtmp://127.0.0.1:1935/live/reEncoded
>
> An example of changing the bitrate to 1000 Kbps:
>
> printf '%016X' 1000000 | xxd -r -p | socat -u STDIN UNIX:/run/bitrate.sock
>
> Signed-off-by: Dmitrii Okunev <xaionaro at gmail.com>
> ---
> libavcodec/Makefile | 2 +-
> libavcodec/mediacodec_wrapper.c | 50 ++++++++
> libavcodec/mediacodec_wrapper.h | 12 ++
> libavcodec/mediacodecenc.c | 128 ++++++++++-----------
> libavcodec/mediacodecenc.h | 97 ++++++++++++++++
> libavcodec/mediacodecenc_ctrl.c | 194 ++++++++++++++++++++++++++++++++
> libavcodec/mediacodecenc_ctrl.h | 50 ++++++++
> 7 files changed, 469 insertions(+), 64 deletions(-)
> create mode 100644 libavcodec/mediacodecenc.h
> create mode 100644 libavcodec/mediacodecenc_ctrl.c
> create mode 100644 libavcodec/mediacodecenc_ctrl.h
>
> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> index 2443d2c6fd..393877c8c6 100644
> --- a/libavcodec/Makefile
> +++ b/libavcodec/Makefile
> @@ -258,7 +258,7 @@ OBJS-$(CONFIG_AURA2_DECODER) += aura.o
> OBJS-$(CONFIG_AV1_DECODER) += av1dec.o av1_parse.o
> OBJS-$(CONFIG_AV1_CUVID_DECODER) += cuviddec.o
> OBJS-$(CONFIG_AV1_MEDIACODEC_DECODER) += mediacodecdec.o
> -OBJS-$(CONFIG_AV1_MEDIACODEC_ENCODER) += mediacodecenc.o
> +OBJS-$(CONFIG_AV1_MEDIACODEC_ENCODER) += mediacodecenc.o mediacodecenc_ctrl.o
> OBJS-$(CONFIG_AV1_NVENC_ENCODER) += nvenc_av1.o nvenc.o
> OBJS-$(CONFIG_AV1_QSV_ENCODER) += qsvenc_av1.o
> OBJS-$(CONFIG_AV1_VAAPI_ENCODER) += vaapi_encode_av1.o av1_levels.o
> diff --git a/libavcodec/mediacodec_wrapper.c b/libavcodec/mediacodec_wrapper.c
> index 96c886666a..fe0e291cad 100644
> --- a/libavcodec/mediacodec_wrapper.c
> +++ b/libavcodec/mediacodec_wrapper.c
> @@ -174,6 +174,7 @@ struct JNIAMediaCodecFields {
> jmethodID get_name_id;
>
> jmethodID configure_id;
> + jmethodID set_parameters_id;
> jmethodID start_id;
> jmethodID flush_id;
> jmethodID stop_id;
> @@ -247,6 +248,9 @@ static const struct FFJniField jni_amediacodec_mapping[] = {
>
> { "android/media/MediaCodec", "setInputSurface", "(Landroid/view/Surface;)V", FF_JNI_METHOD, OFFSET(set_input_surface_id), 0 },
> { "android/media/MediaCodec", "signalEndOfInputStream", "()V", FF_JNI_METHOD, OFFSET(signal_end_of_input_stream_id), 0 },
> +#if __ANDROID_API__ >= 26
> + { "android/media/MediaCodec", "setParameters", "(Landroid/media/MediaFormat;)V", FF_JNI_METHOD, OFFSET(set_parameters_id), 1 },
> +#endif
>
> { "android/media/MediaCodec$BufferInfo", NULL, NULL, FF_JNI_CLASS, OFFSET(mediainfo_class), 1 },
>
> @@ -1411,6 +1415,27 @@ fail:
> return ret;
> }
>
> +#if __ANDROID_API__ >= 26
> +static int mediacodec_jni_setParameters(FFAMediaCodec *ctx,
> + const FFAMediaFormat *format_ctx)
> +{
> + int ret = 0;
> + JNIEnv *env = NULL;
> + FFAMediaCodecJni *codec = (FFAMediaCodecJni *)ctx;
> + const FFAMediaFormatJni *format = (FFAMediaFormatJni *)format_ctx;
> +
> + JNI_GET_ENV_OR_RETURN(env, codec, AVERROR_EXTERNAL);
> +
> + (*env)->CallVoidMethod(env, codec->object, codec->jfields.set_parameters_id, format->object);
> +
> + if (ff_jni_exception_check(env, 1, codec) < 0) {
> + ret = AVERROR_EXTERNAL;
> + }
> +
> + return ret;
> +}
> +#endif // __ANDROID_API__ >= 26
> +
> static int mediacodec_jni_start(FFAMediaCodec* ctx)
> {
> int ret = 0;
> @@ -1821,6 +1846,10 @@ static const FFAMediaCodec media_codec_jni = {
> .getConfigureFlagEncode = mediacodec_jni_getConfigureFlagEncode,
> .cleanOutputBuffers = mediacodec_jni_cleanOutputBuffers,
> .signalEndOfInputStream = mediacodec_jni_signalEndOfInputStream,
> +
> +#if __ANDROID_API__ >= 26
> + .setParameters = mediacodec_jni_setParameters,
> +#endif //__ANDROID_API__ >= 26
> };
>
> typedef struct FFAMediaFormatNdk {
> @@ -2178,6 +2207,23 @@ static int mediacodec_ndk_configure(FFAMediaCodec* ctx,
> return 0;
> }
>
> +#if __ANDROID_API__ >= 26
> +static int mediacodec_ndk_setParameters(FFAMediaCodec *ctx,
> + const FFAMediaFormat *format_ctx)
> +{
> + FFAMediaCodecNdk *codec = (FFAMediaCodecNdk *)ctx;
> + FFAMediaFormatNdk *format = (FFAMediaFormatNdk *)format_ctx;
> +
> + int status = AMediaCodec_setParameters(codec->impl, format->impl);
> + if (status != AMEDIA_OK) {
> + av_log(codec, AV_LOG_ERROR, "codec setParameters failed, %d\n", status);
> + return AVERROR_EXTERNAL;
> + }
> +
> + return 0;
> +}
> +#endif //__ANDROID_API__ >= 26
> +
> #define MEDIACODEC_NDK_WRAPPER(method) \
> static int mediacodec_ndk_ ## method(FFAMediaCodec* ctx) \
> { \
> @@ -2396,6 +2442,10 @@ static const FFAMediaCodec media_codec_ndk = {
> .getConfigureFlagEncode = mediacodec_ndk_getConfigureFlagEncode,
> .cleanOutputBuffers = mediacodec_ndk_cleanOutputBuffers,
> .signalEndOfInputStream = mediacodec_ndk_signalEndOfInputStream,
> +
> +#if __ANDROID_API__ >= 26
> + .setParameters = mediacodec_ndk_setParameters,
> +#endif //__ANDROID_API__ >= 26
> };
>
> FFAMediaFormat *ff_AMediaFormat_new(int ndk)
> diff --git a/libavcodec/mediacodec_wrapper.h b/libavcodec/mediacodec_wrapper.h
> index 11a4260497..9b5dbfb8dd 100644
> --- a/libavcodec/mediacodec_wrapper.h
> +++ b/libavcodec/mediacodec_wrapper.h
> @@ -219,6 +219,10 @@ struct FFAMediaCodec {
>
> // For encoder with FFANativeWindow as input.
> int (*signalEndOfInputStream)(FFAMediaCodec *);
> +
> +#if __ANDROID_API__ >= 26
> + int (*setParameters)(FFAMediaCodec* codec, const FFAMediaFormat* format);
> +#endif //__ANDROID_API__ >= 26
> };
>
> static inline char *ff_AMediaCodec_getName(FFAMediaCodec *codec)
> @@ -238,6 +242,14 @@ static inline int ff_AMediaCodec_configure(FFAMediaCodec *codec,
> return codec->configure(codec, format, surface, crypto, flags);
> }
>
> +#if __ANDROID_API__ >= 26
> +static inline int ff_AMediaCodec_setParameters(FFAMediaCodec *codec,
> + const FFAMediaFormat *format)
> +{
> + return codec->setParameters(codec, format);
> +}
> +#endif //__ANDROID_API__ >= 26
> +
> static inline int ff_AMediaCodec_start(FFAMediaCodec* codec)
> {
> return codec->start(codec);
> diff --git a/libavcodec/mediacodecenc.c b/libavcodec/mediacodecenc.c
> index bbf570e7be..b953457a5a 100644
> --- a/libavcodec/mediacodecenc.c
> +++ b/libavcodec/mediacodecenc.c
> @@ -29,76 +29,16 @@
> #include "libavutil/mem.h"
> #include "libavutil/opt.h"
>
> -#include "avcodec.h"
> -#include "bsf.h"
> #include "codec_internal.h"
> #include "encode.h"
> #include "hwconfig.h"
> #include "jni.h"
> #include "mediacodec.h"
> -#include "mediacodec_wrapper.h"
> #include "mediacodecdec_common.h"
> +#include "mediacodecenc_ctrl.h"
> #include "profiles.h"
> -
> -#define INPUT_DEQUEUE_TIMEOUT_US 8000
> -#define OUTPUT_DEQUEUE_TIMEOUT_US 8000
> -
> -enum BitrateMode {
> - /* Constant quality mode */
> - BITRATE_MODE_CQ = 0,
> - /* Variable bitrate mode */
> - BITRATE_MODE_VBR = 1,
> - /* Constant bitrate mode */
> - BITRATE_MODE_CBR = 2,
> - /* Constant bitrate mode with frame drops */
> - BITRATE_MODE_CBR_FD = 3,
> -};
> -
> -typedef struct MediaCodecEncContext {
> - AVClass *avclass;
> - FFAMediaCodec *codec;
> - int use_ndk_codec;
> - const char *name;
> - FFANativeWindow *window;
> -
> - int fps;
> - int width;
> - int height;
> -
> - uint8_t *extradata;
> - int extradata_size;
> - int eof_sent;
> -
> - AVFrame *frame;
> - AVBSFContext *bsf;
> -
> - int bitrate_mode;
> - int level;
> - int pts_as_dts;
> - int extract_extradata;
> -} MediaCodecEncContext;
> -
> -enum {
> - COLOR_FormatYUV420Planar = 0x13,
> - COLOR_FormatYUV420SemiPlanar = 0x15,
> - COLOR_FormatSurface = 0x7F000789,
> -};
> -
> -static const struct {
> - int color_format;
> - enum AVPixelFormat pix_fmt;
> -} color_formats[] = {
> - { COLOR_FormatYUV420Planar, AV_PIX_FMT_YUV420P },
> - { COLOR_FormatYUV420SemiPlanar, AV_PIX_FMT_NV12 },
> - { COLOR_FormatSurface, AV_PIX_FMT_MEDIACODEC },
> -};
> -
> -static const enum AVPixelFormat avc_pix_fmts[] = {
> - AV_PIX_FMT_MEDIACODEC,
> - AV_PIX_FMT_YUV420P,
> - AV_PIX_FMT_NV12,
> - AV_PIX_FMT_NONE
> -};
> +#include "mediacodecenc.h"
> +#include "mediacodecenc_ctrl.h"
>
> static void mediacodec_output_format(AVCodecContext *avctx)
> {
> @@ -307,6 +247,20 @@ static av_cold int mediacodec_init(AVCodecContext *avctx)
> if (s->bitrate_mode == BITRATE_MODE_CQ && avctx->global_quality > 0)
> ff_AMediaFormat_setInt32(format, "quality", avctx->global_quality);
> }
> +
> + if (strlen(s->bitrate_ctrl_socket) != 0) {
> +#if __ANDROID_API__ >= 26
> + int error = mediacodecenc_ctrl_init(avctx, format);
> + if (error) {
> + av_log(avctx, AV_LOG_ERROR, "unable to initialize the control socket '%s' for MediaCodec bitrate: errcode:%d, description:'%s'\n", s->bitrate_ctrl_socket, errno, strerror(errno));
> + goto bailout;
> + }
> +#else
> + av_log(avctx, AV_LOG_ERROR, "ffmpeg was compiled against Android API version %d, but option -bitrate_ctrl_socket requires version 26\n", __ANDROID_API__);
> + goto bailout;
> +#endif //__ANDROID_API__ >= 26
> + }
> +
> // frame-rate and i-frame-interval are required to configure codec
> if (avctx->framerate.num >= avctx->framerate.den && avctx->framerate.den > 0) {
> s->fps = avctx->framerate.num / avctx->framerate.den;
> @@ -385,6 +339,37 @@ bailout:
> return ret;
> }
>
> +#if __ANDROID_API__ >= 26
> +static void update_bitrate(AVCodecContext *avctx) {
> + MediaCodecEncContext *s = avctx->priv_data;
> +
> + uint64_t bitrate_new = __atomic_load_n(&s->ctrl_ctx.bitrate_next, __ATOMIC_SEQ_CST);
> + if (bitrate_new == s->ctrl_ctx.bitrate_cur) {
> + return;
> + }
> +
> + if (bitrate_new < 1) {
> + return;
> + }
> +
> + if (bitrate_new > UINT32_MAX) {
> + av_log(avctx, AV_LOG_ERROR, "the requested bitrate %lu overflows a 32bit integer: %lu > %u\n", bitrate_new, bitrate_new, UINT32_MAX);
> + return;
> + }
> +
> + av_log(avctx, AV_LOG_DEBUG, "sending a message to update the bitrate through format %p using method %p\n", s->ctrl_ctx.out_format, s->ctrl_ctx.out_format->setInt32);
> +
> + ff_AMediaFormat_setInt32(s->ctrl_ctx.out_format, (char *)"video-bitrate", bitrate_new);
> + if (ff_AMediaCodec_setParameters(s->codec, s->ctrl_ctx.out_format)) {
> + av_log(avctx, AV_LOG_ERROR, "unable to set the bitrate to %lu\n", bitrate_new);
> + return;
> + }
> +
> + av_log(avctx, AV_LOG_INFO, "changed the bitrate: %lu -> %lu\n", s->ctrl_ctx.bitrate_cur, bitrate_new);
> + __atomic_store_n(&s->ctrl_ctx.bitrate_cur, bitrate_new, __ATOMIC_SEQ_CST);
> +}
> +#endif //__ANDROID_API__ >= 26
> +
> static int mediacodec_receive(AVCodecContext *avctx, AVPacket *pkt)
> {
> MediaCodecEncContext *s = avctx->priv_data;
> @@ -395,6 +380,7 @@ static int mediacodec_receive(AVCodecContext *avctx, AVPacket *pkt)
> int ret;
> int extradata_size = 0;
> int64_t timeout_us = s->eof_sent ? OUTPUT_DEQUEUE_TIMEOUT_US : 0;
> +
> ssize_t index = ff_AMediaCodec_dequeueOutputBuffer(codec, &out_info, timeout_us);
>
> if (ff_AMediaCodec_infoTryAgainLater(codec, index))
> @@ -563,6 +549,13 @@ static int mediacodec_encode(AVCodecContext *avctx, AVPacket *pkt)
> return 0;
> }
>
> +#if __ANDROID_API__ >= 26
> + if (strlen(s->bitrate_ctrl_socket) != 0 && s->ctrl_ctx.bitrate_next != s->ctrl_ctx.bitrate_cur) {
> + av_log(avctx, AV_LOG_TRACE, "calling update_bitrate\n");
> + update_bitrate(avctx);
> + }
> +#endif //__ANDROID_API__ >= 26
> +
> if (ret < 0 && ret != AVERROR(EAGAIN))
> return ret;
>
> @@ -689,6 +682,13 @@ bailout:
> static av_cold int mediacodec_close(AVCodecContext *avctx)
> {
> MediaCodecEncContext *s = avctx->priv_data;
> +
> +#if __ANDROID_API__ >= 26
> + if (strlen(s->bitrate_ctrl_socket) != 0) {
> + mediacodecenc_ctrl_deinit(avctx);
> + }
> +#endif //__ANDROID_API__ >= 26
> +
> if (s->codec) {
> ff_AMediaCodec_stop(s->codec);
> ff_AMediaCodec_delete(s->codec);
> @@ -737,6 +737,8 @@ static const AVCodecHWConfigInternal *const mediacodec_hw_configs[] = {
> OFFSET(name), AV_OPT_TYPE_STRING, {0}, 0, 0, VE }, \
> { "bitrate_mode", "Bitrate control method", \
> OFFSET(bitrate_mode), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, VE, .unit = "bitrate_mode" }, \
> + { "bitrate_ctrl_socket", "Enable (and set path to) a control UNIX socket that receives uint64_t big-endian messages that dynamically override the bitrate; the value is given in bits per second.", \
> + OFFSET(bitrate_ctrl_socket), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, VE }, \
> { "cq", "Constant quality mode", \
> 0, AV_OPT_TYPE_CONST, {.i64 = BITRATE_MODE_CQ}, 0, 0, VE, .unit = "bitrate_mode" }, \
> { "vbr", "Variable bitrate mode", \
> diff --git a/libavcodec/mediacodecenc.h b/libavcodec/mediacodecenc.h
> new file mode 100644
> index 0000000000..8915c99f54
> --- /dev/null
> +++ b/libavcodec/mediacodecenc.h
> @@ -0,0 +1,97 @@
> +/*
> + * Android MediaCodec encoders
> + *
> + * Copyright (c) 2022 Zhao Zhili <zhilizhao at tencent.com>
> + * Copyright (c) 2024 Dmitrii Okunev <xaionaro at gmail.com>
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#ifndef AVCODEC_MEDIACODECENC_H
> +#define AVCODEC_MEDIACODECENC_H
> +
> +#include "avcodec.h"
> +#include "bsf.h"
> +#include "mediacodec_wrapper.h"
> +#include "mediacodecenc_ctrl.h"
> +
> +#define INPUT_DEQUEUE_TIMEOUT_US 8000
> +#define OUTPUT_DEQUEUE_TIMEOUT_US 8000
> +
> +enum BitrateMode {
> + /* Constant quality mode */
> + BITRATE_MODE_CQ = 0,
> + /* Variable bitrate mode */
> + BITRATE_MODE_VBR = 1,
> + /* Constant bitrate mode */
> + BITRATE_MODE_CBR = 2,
> + /* Constant bitrate mode with frame drops */
> + BITRATE_MODE_CBR_FD = 3,
> +};
> +
> +typedef struct MediaCodecEncContext {
> + AVClass *avclass;
> + FFAMediaCodec *codec;
> + int use_ndk_codec;
> + const char *name;
> + FFANativeWindow *window;
> +
> + int fps;
> + int width;
> + int height;
> +
> + uint8_t *extradata;
> + int extradata_size;
> + int eof_sent;
> +
> + AVFrame *frame;
> + AVBSFContext *bsf;
> +
> + int bitrate_mode;
> + char *bitrate_ctrl_socket;
> + int level;
> + int pts_as_dts;
> + int extract_extradata;
> +
> +#if __ANDROID_API__ >= 26
> + MediaCodecEncControlContext ctrl_ctx;
> +#endif //__ANDROID_API__ >= 26
> +} MediaCodecEncContext;
> +
> +enum {
> + COLOR_FormatYUV420Planar = 0x13,
> + COLOR_FormatYUV420SemiPlanar = 0x15,
> + COLOR_FormatSurface = 0x7F000789,
> +};
> +
> +static const struct {
> + int color_format;
> + enum AVPixelFormat pix_fmt;
> +} color_formats[] = {
> + { COLOR_FormatYUV420Planar, AV_PIX_FMT_YUV420P },
> + { COLOR_FormatYUV420SemiPlanar, AV_PIX_FMT_NV12 },
> + { COLOR_FormatSurface, AV_PIX_FMT_MEDIACODEC },
> +};
> +
> +static const enum AVPixelFormat avc_pix_fmts[] = {
> + AV_PIX_FMT_MEDIACODEC,
> + AV_PIX_FMT_YUV420P,
> + AV_PIX_FMT_NV12,
> + AV_PIX_FMT_NONE
> +};
> +
> +#endif /* AVCODEC_MEDIACODECENC_H */
> diff --git a/libavcodec/mediacodecenc_ctrl.c b/libavcodec/mediacodecenc_ctrl.c
> new file mode 100644
> index 0000000000..a732594ecd
> --- /dev/null
> +++ b/libavcodec/mediacodecenc_ctrl.c
> @@ -0,0 +1,194 @@
> +/*
> + * Android MediaCodec encoders
> + *
> + * Copyright (c) 2024 Dmitrii Okunev <xaionaro at gmail.com>
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#if __ANDROID_API__ >= 26
> +
> +#include <endian.h>
> +#include <stdatomic.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <stdint.h>
> +#include <sys/socket.h>
> +#include <sys/un.h>
> +#include <unistd.h>
> +#include <pthread.h>
> +
> +#include "mediacodecenc_ctrl.h"
> +#include "mediacodecenc.h"
> +
> +typedef struct mediacodecenc_ctrl_handle_connection_context {
> + int client_sock_fd;
> + AVCodecContext *avctx;
> +} mediacodecenc_ctrl_handle_connection_context_t;
> +
> +static void *mediacodecenc_ctrl_handle_connection(void *arg) {
> + mediacodecenc_ctrl_handle_connection_context_t *hctx = arg;
> + AVCodecContext *avctx = hctx->avctx;
> + MediaCodecEncContext *s = avctx->priv_data;
> +
> + while (1) {
> + uint64_t received_value, bitrate_old, bitrate_new;
> + ssize_t num_bytes = recv(hctx->client_sock_fd, &received_value, sizeof(received_value), MSG_CMSG_CLOEXEC);
> + if (num_bytes <= 0) {
> + switch (errno) {
> + case 0:
> + case ECONNRESET:
> + case EPIPE:
> + case EBADF:
> + av_log(avctx, AV_LOG_INFO, "The MediaCodec control connection was closed: errno:%d: %s\n", errno, strerror(errno));
> + break;
> + default:
> + av_log(avctx, AV_LOG_ERROR, "A failure of a MediaCodec control connection: errno:%d: %s\n", errno, strerror(errno));
> + }
> + break;
> + }
> +
> + bitrate_new = be64toh(received_value);
> +
> + av_log(avctx, AV_LOG_TRACE, "Received a message to change the bitrate to %lu.\n", bitrate_new);
> +
> + bitrate_old = __atomic_load_n(&s->ctrl_ctx.bitrate_cur, __ATOMIC_SEQ_CST);
> + if (bitrate_new == bitrate_old) {
> + av_log(avctx, AV_LOG_INFO, "Received a message to change the bitrate, but the bitrate is already %lu, not changing.\n", bitrate_old);
> + continue;
> + }
> +
> + av_log(avctx, AV_LOG_INFO, "Received a message to change the bitrate from %lu to %lu.\n", bitrate_old, bitrate_new);
> + __atomic_store_n(&s->ctrl_ctx.bitrate_next, bitrate_new, __ATOMIC_SEQ_CST);
> + }
> +
> + close(hctx->client_sock_fd);
> + free(hctx);
> + pthread_exit(NULL);
> +}
> +
> +static void *mediacodecenc_ctrl_handle_listener(void *_avctx) {
> + AVCodecContext *avctx = _avctx;
> + MediaCodecEncContext *s = avctx->priv_data;
> +
> + if (listen(s->ctrl_ctx.server_sock_fd, 5) < 0) {
> + av_log(avctx, AV_LOG_ERROR, "Failed to start listening socket '%s': errno:%d: %s\n", s->ctrl_ctx.server_sock_path, errno, strerror(errno));
> + goto mediacodecenc_ctrl_handle_listener_end;
> + }
> +
> + av_log(avctx, AV_LOG_TRACE, "Listening socket '%s'\n", s->ctrl_ctx.server_sock_path);
> +
> + s->ctrl_ctx.listener_status = mcls_running;
> + while (s->ctrl_ctx.listener_status == mcls_running) {
> + pthread_t client_thread_id;
> + int pthread_error;
> + mediacodecenc_ctrl_handle_connection_context_t *hctx;
> +
> + int client_sock_fd = accept(s->ctrl_ctx.server_sock_fd, NULL, NULL);
> + if (client_sock_fd < 0) {
> + av_log(avctx, AV_LOG_ERROR, "Failed to accept a connection to socket '%s': code:%d: description:%s\n", s->ctrl_ctx.server_sock_path, errno, strerror(errno));
> + continue;
> + }
> +
> + av_log(avctx, AV_LOG_TRACE, "Accepted a connection to '%s'\n", s->ctrl_ctx.server_sock_path);
> +
> + hctx = malloc(sizeof(mediacodecenc_ctrl_handle_connection_context_t));
> + hctx->client_sock_fd = client_sock_fd;
> + hctx->avctx = avctx;
> +
> + pthread_error = pthread_create(&client_thread_id, NULL, mediacodecenc_ctrl_handle_connection, hctx);
> + if (pthread_error != 0) {
> + av_log(avctx, AV_LOG_ERROR, "Failed to accept a connection to socket '%s': code:%d: description:%s\n", s->ctrl_ctx.server_sock_path, pthread_error, strerror(pthread_error));
> + free(hctx);
> + close(client_sock_fd);
> + continue;
> + }
> +
> + // mediacodecenc_ctrl_handle_connection takes ownership of hctx and frees it when finished,
> + // so we are only detaching here and that's it.
> + pthread_error = pthread_detach(client_thread_id);
> + if (pthread_error != 0) {
> + av_log(avctx, AV_LOG_ERROR, "Unable to detach the client handler thread: code:%d: description:%s\n", pthread_error, strerror(pthread_error));
> + }
> + }
> +
> +mediacodecenc_ctrl_handle_listener_end:
> + close(s->ctrl_ctx.server_sock_fd);
> + unlink(s->ctrl_ctx.server_sock_path);
> + s->ctrl_ctx.listener_status = mcls_stopped;
> + pthread_exit(NULL);
> +}
> +
> +int mediacodecenc_ctrl_init(AVCodecContext *avctx, FFAMediaFormat *format) {
> + MediaCodecEncContext *s = avctx->priv_data;
> + char *socket_path = s->bitrate_ctrl_socket;
> + int server_sock_fd;
> + struct sockaddr_un server_addr;
> + int pthread_error;
> +
> + s->ctrl_ctx.bitrate_cur = avctx->bit_rate;
> + s->ctrl_ctx.bitrate_next = s->ctrl_ctx.bitrate_cur;
> + s->ctrl_ctx.out_format = format;
> +
> + server_sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
> + if (server_sock_fd < 0) {
> + av_log(avctx, AV_LOG_ERROR, "Failed to create socket '%s': errno:%d: %s\n", socket_path, errno, strerror(errno));
> + return errno;
> + }
> +
> + memset(&server_addr, 0, sizeof(struct sockaddr_un));
> + server_addr.sun_family = AF_UNIX;
> + strncpy(server_addr.sun_path, socket_path, sizeof(server_addr.sun_path) - 1);
> +
> + if (bind(server_sock_fd, (struct sockaddr *)&server_addr, sizeof(struct sockaddr_un)) < 0) {
> + av_log(avctx, AV_LOG_ERROR, "Failed to bind to the socket '%s': errno:%d: %s\n", socket_path, errno, strerror(errno));
> + return errno;
> + }
> + s->ctrl_ctx.server_sock_path = socket_path;
> + s->ctrl_ctx.server_sock_fd = server_sock_fd;
> +
> + pthread_error = pthread_create(&s->ctrl_ctx.listener_thread_id, NULL, mediacodecenc_ctrl_handle_listener, avctx);
> + if (pthread_error != 0) {
> + av_log(avctx, AV_LOG_ERROR, "Failed to create a thread to listen the socket '%s': errno:%d: %s\n", socket_path, pthread_error, strerror(pthread_error));
> + return pthread_error;
> + }
> +
> + return 0;
> +}
> +
> +int mediacodecenc_ctrl_deinit(AVCodecContext *avctx) {
> + MediaCodecEncContext *s = avctx->priv_data;
> + void *retval;
> + int pthread_error;
> + if (s->ctrl_ctx.listener_thread_id != 0) {
> + return 0;
> + }
> +
> + s->ctrl_ctx.listener_status = mcls_stopping;
> + close(s->ctrl_ctx.server_sock_fd);
> +
> + pthread_error = pthread_join(s->ctrl_ctx.listener_thread_id, &retval);
> + if (pthread_error != 0) {
> + av_log(avctx, AV_LOG_ERROR, "Failed to detach from the listener thread of the socket '%s': errno:%d: %s\n", s->ctrl_ctx.server_sock_path, pthread_error, strerror(pthread_error));
> + return pthread_error;
> + }
> +
> + ff_AMediaFormat_delete(s->ctrl_ctx.out_format);
> + return 0;
> +}
> +
> +#endif //__ANDROID_API__ >= 26
> diff --git a/libavcodec/mediacodecenc_ctrl.h b/libavcodec/mediacodecenc_ctrl.h
> new file mode 100644
> index 0000000000..a5df203639
> --- /dev/null
> +++ b/libavcodec/mediacodecenc_ctrl.h
> @@ -0,0 +1,50 @@
> +/*
> + * Android MediaCodec encoders
> + *
> + * Copyright (c) 2024 Dmitrii Okunev <xaionaro at gmail.com>
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#ifndef AVCODEC_MEDIACODECENC_CTRL_H
> +#define AVCODEC_MEDIACODECENC_CTRL_H
> +#if __ANDROID_API__ >= 26
> +
> +#include "avcodec.h"
> +#include "mediacodec_wrapper.h"
> +
> +typedef enum mediacodecenc_ctrl_listener_status {
> + mcls_stopped = 0,
> + mcls_running = 1,
> + mcls_stopping = 2,
> +} mediacodecenc_ctrl_listener_status_t;
> +
> +typedef struct mediacodecenc_ctrl_ctx {
> + char *server_sock_path;
> + int server_sock_fd;
> + pthread_t listener_thread_id;
> + mediacodecenc_ctrl_listener_status_t listener_status;
> + uint64_t bitrate_cur;
> + uint64_t bitrate_next;
> + FFAMediaFormat *out_format;
> +} MediaCodecEncControlContext;
> +
> +extern int mediacodecenc_ctrl_init(AVCodecContext *avctx, FFAMediaFormat *format);
> +extern int mediacodecenc_ctrl_deinit(AVCodecContext *avctx);
> +
> +#endif //__ANDROID_API__ >= 26
> +#endif /* AVCODEC_MEDIACODECENC_CTRL_H */
> --
> 2.43.0
>
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