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video: vendor FFmpeg software AVC renderer

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Adds an LGPL FFmpeg-backed video renderer that slots ahead of Media3's
MediaCodecVideoRenderer via EXTENSION_RENDERER_MODE_PREFER. Resolves
playback failures on Huawei EMUI 11 (Mate 20, Kirin 980): the Codec2
HiSilicon AVC decoder initialises cleanly on iOS High@3.1 streams with
deep DPB + full-range yuvj420p, then errors on the first sample inside
MediaCodecVideoRenderer (init-failure fallback can't catch this).
Google's C2 SW AVC decoder hits its 8-frame output-delay cap on the
same shape and stalls on dequeueOutputBuffer.

Media3's own decoder-ffmpeg ships only an audio renderer;
ExperimentalFfmpegVideoRenderer has been a stub since 2020 (returns
FORMAT_UNSUPPORTED_TYPE, createDecoder returns null). NextLib is
GPL-3.0. So we vendor our own Apache-licensed JNI on top of LGPL
FFmpeg, dynamically linked at runtime.

Build flow:
  - android/ffmpeg/ holds the JNI source + CMakeLists + orchestrator
    script + LGPL notice. No native binaries in git.
  - :ux:buildFfmpegJni Gradle task (wired to preBuild) clones
    Media3 1.9.2 + FFmpeg release/6.0 into build/ffmpeg-work/ on
    first run, builds h264-only static libs per ABI, links
    libffmpegJNI.so per ABI into build/jniLibs/<abi>/. AGP picks
    them up via sourceSets.main.jniLibs.srcDirs +=. Gradle
    UP-TO-DATE skips the task when ffmpeg_jni.cc / CMakeLists /
    build_ffmpeg.sh are unchanged.

Renderer:
  - FfmpegVideoDecoder (SimpleDecoder) sends each packet with its
    inputBuffer.timeUs as pkt->pts; the JNI overwrites
    outputBuffer.timeUs with f->pts on receive so frames emitted in
    display order carry their true display PTS (input PTS in decode
    order scrambles ExoPlayer's drop logic and halves the render
    rate on B-frame streams).
  - FfmpegOutputSurface does YUV->RGB in one GLES2 pass against an
    EGL window surface sized to display orientation. Y plane uses
    GL_NEAREST (1:1 sized, sampling at exact texel centres
    preserves luma detail); chroma uses GL_LINEAR. Pre-rotated quad
    UVs (0/90/180/270) keep the YUV sampling correct when the
    coded frame needs rotation for display.
  - FfmpegVideoRenderer swaps the output buffer's width/height for
    90/270 streams before super.renderOutputBuffer notifies size,
    matching MediaCodecVideoRenderer's post-rotation reporting.

Decoder fallback:
  - Renderers.kt selects FfmpegVideoRenderer first when
    libffmpegJNI.so is loaded; falls through to the platform path
    for formats FFmpeg doesn't handle or ABIs without the .so.
  - MediaCodec selector deprioritises every HiSilicon decoder
    (OMX.hisi.* and c2.hisi.*) so the platform path picks
    c2.android.avc.decoder ahead of the C2 Hisi variant when FFmpeg
    isn't available. Required because the C2 Hisi failure is
    post-init, which Media3's setEnableDecoderFallback(true) can't
    intercept.

Compositor:
  - VideoCompositor.setInputSurfaceSize lets the renderer resize the
    codec-input SurfaceTexture before eglCreateWindowSurface so the
    EGL surface inherits matching buffer dimensions on creation
    (MediaCodec sizes natively; EGL doesn't).
  - VideoPlayerInstance wires Renderers.build with a sizer callback
    that calls into compositor.setInputSurfaceSize from the FFmpeg
    renderer thread.

Adds docs/architecture.md with the layered video pipeline diagram,
file map, renderer-selection rationale, build flow, and LGPL
boundary notes.
This commit is contained in:
agra
2026-05-28 19:24:17 +03:00
parent 7ad3a38d38
commit 7243ef7de4
16 changed files with 2439 additions and 16 deletions
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64
android/ffmpeg/CMakeLists.txt Normal file
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#
# Copyright 2021 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# LINT.IfChange
cmake_minimum_required(VERSION 3.21.0 FATAL_ERROR)
# LINT.ThenChange(../../../build.gradle)
# Enable C++11 features.
set(CMAKE_CXX_STANDARD 11)
project(libffmpegJNI C CXX)
set(ffmpeg_location "${CMAKE_CURRENT_SOURCE_DIR}/ffmpeg")
set(ffmpeg_binaries "${ffmpeg_location}/android-libs/${ANDROID_ABI}")
foreach(ffmpeg_lib avutil swresample avcodec)
set(ffmpeg_lib_filename lib${ffmpeg_lib}.a)
set(ffmpeg_lib_file_path ${ffmpeg_binaries}/${ffmpeg_lib_filename})
add_library(
${ffmpeg_lib}
STATIC
IMPORTED)
set_target_properties(
${ffmpeg_lib} PROPERTIES
IMPORTED_LOCATION
${ffmpeg_lib_file_path})
endforeach()
include_directories(${ffmpeg_location})
find_library(android_log_lib log)
add_library(ffmpegJNI
SHARED
ffmpeg_jni.cc)
target_link_libraries(ffmpegJNI
PRIVATE android
PRIVATE swresample
PRIVATE avcodec
PRIVATE avutil
PRIVATE ${android_log_lib})
# Additional flags needed for "arm64-v8a" from NDK 23.1.7779620 and above.
# See https://github.com/google/ExoPlayer/issues/9933#issuecomment-1029775358.
if(ANDROID_ABI STREQUAL "arm64-v8a")
target_link_options(ffmpegJNI PRIVATE "-Wl,-Bsymbolic")
endif()
# Enable 16 KB ELF alignment.
target_link_options(ffmpegJNI
PRIVATE "-Wl,-z,max-page-size=16384")

502
android/ffmpeg/LICENSE-FFMPEG.txt Normal file
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# Vendored FFmpeg video decoder for `ux`
This directory contains the JNI source + Gradle build wiring for
`libffmpegJNI.so`, the LGPL-licensed FFmpeg shared library that backs
`io.swipelab.ux.video.ffmpeg.FfmpegVideoRenderer`. The renderer is
slotted ahead of `MediaCodecVideoRenderer` so iOS H.264 streams with
deep DPB (`has_b_frames > 8`) and full-range YUV play on devices where
the platform decoder fails (notably Huawei Mate 20 on EMUI 11).
## How it builds
The native library is produced by the `:ux:buildFfmpegJni` Gradle task,
wired as a dependency of `preBuild`. On any consumer build
(`flutter build apk`, `./gradlew assembleRelease`, IDE sync) the task
runs automatically; Gradle's UP-TO-DATE checking skips it when nothing
relevant changed.
What the task does:
1. Clones upstream Media3 (`1.9.2`) and FFmpeg (`release/6.0`) into
`<ux-android-build>/ffmpeg-work/` if missing — once per checkout.
2. Drops the vendored `ffmpeg_jni.cc` + `CMakeLists.txt` over the
upstream Media3 copies so the build produces a video-capable JNI.
3. Builds FFmpeg static libs (`libavcodec`, `libavutil`,
`libswresample`) with H.264 decoder enabled for `armeabi-v7a`,
`arm64-v8a`, `x86`, `x86_64`. Slow part — first build only
(~30 min on a typical x86 host, ~2 min on Apple Silicon). Static
libs are cached in `ffmpeg-work/` and reused on subsequent runs.
4. Cross-compiles `libffmpegJNI.so` per ABI via CMake + Ninja and
writes the result into `<ux-android-build>/jniLibs/<abi>/`. AGP
picks them up via the `jniLibs.srcDirs +=` line in
[build.gradle](../build.gradle) and bundles them in the AAR.
What ships in git:
* `ffmpeg_jni.cc` — JNI bridge exposing the five entry points
`FfmpegVideoDecoder.java` calls: initialize / sendPacket /
receiveFrame / flush / release. Adapted from Media3's audio-only
template; the audio path was dropped (MediaCodec AAC works
everywhere we ship to).
* `CMakeLists.txt` — links the FFmpeg static libs into
`libffmpegJNI.so`.
* `build_ffmpeg.sh` — orchestrates the clone + static-lib build +
JNI link. Env-driven, invoked only by the Gradle task — not
intended to be run by hand.
* `LICENSE-FFMPEG.txt` — LGPL v2.1 text. Required attribution.
**No `.so` files in git.** Everything under `<build>/jniLibs/` is
generated on demand; `/build` is already in [.gitignore](../.gitignore).
## License
FFmpeg is LGPL v2.1. We link to it dynamically (consumer apps load
`libffmpegJNI.so` at runtime via `System.loadLibrary`), which keeps the
LGPL boundary intact and does not impose copyleft on the consuming
app. The build configuration in upstream Media3's `build_ffmpeg.sh`
intentionally omits `--enable-gpl` and `--enable-nonfree` to keep the
binaries LGPL-only. Do not add codecs that require GPL configuration
(e.g. x264) — that would taint the artifact.
## Pinned versions
* Media3 `1.9.2` (matches the version used by the rest of `ux`).
* FFmpeg `release/6.0` (matches Media3's tested compatibility window).
* Android NDK is resolved via `android.ndkDirectory` from AGP — the
NDK version your Android project pins, normally r27 on a recent
AGP. Older NDKs may fail the 16-KB page-size alignment check
enforced for Android 15.
Bumping either version: edit the `MEDIA3_TAG` / `FFMPEG_TAG`
constants near the top of `build_ffmpeg.sh`, then `./gradlew
:ux:buildFfmpegJni --rerun-tasks` to force a rebuild.
## Why we vendor this instead of using `media3-decoder-ffmpeg`
Media3's published FFmpeg extension is audio-only.
`ExperimentalFfmpegVideoRenderer` in the same library has been a stub
since 2020 — `createDecoder()` returns null, `supportsFormat()` returns
`FORMAT_UNSUPPORTED_TYPE`. The community alternative (NextLib) is
GPL-3.0, which would impose copyleft on consumers. So we built our own
on top of the same JNI skeleton.

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#!/bin/bash
# Builds libffmpegJNI.so for all 4 Android ABIs from vendored JNI sources
# (ffmpeg_jni.cc + CMakeLists.txt in this directory) against upstream
# Media3 + FFmpeg cloned into WORK_DIR. Driven entirely by environment
# variables Gradle sets in the buildFfmpegJni task — no user-facing
# flags. Reruns are cheap once WORK_DIR is populated (Gradle UP-TO-DATE
# skips the script entirely when JNI sources haven't changed, and even
# when forced, the FFmpeg static libs are reused if present).
#
# Required env:
# JNI_SRC — this directory (vendored ffmpeg_jni.cc + CMakeLists.txt)
# NDK_PATH — Android NDK root
# CMAKE_PATH — directory containing the cmake + ninja binaries
# OUTPUT_DIR — where to drop the final libffmpegJNI.so per ABI
# WORK_DIR — scratch directory for upstream clones + intermediate
# build artefacts (lives under build/ so a clean wipes it)
#
# License: FFmpeg is LGPL v2.1. We link to it dynamically (consumers
# load libffmpegJNI.so at runtime), keeping the LGPL boundary intact and
# not imposing copyleft on the consuming app. The build below
# intentionally omits --enable-gpl and --enable-nonfree.
set -euo pipefail
: "${JNI_SRC:?JNI_SRC env var not set}"
: "${NDK_PATH:?NDK_PATH env var not set}"
: "${CMAKE_PATH:?CMAKE_PATH env var not set}"
: "${OUTPUT_DIR:?OUTPUT_DIR env var not set}"
: "${WORK_DIR:?WORK_DIR env var not set}"
MEDIA3_TAG="${MEDIA3_TAG:-1.9.2}"
FFMPEG_TAG="${FFMPEG_TAG:-release/6.0}"
ABIS="${ABIS:-armeabi-v7a arm64-v8a x86 x86_64}"
MIN_SDK="${MIN_SDK:-21}"
case "$(uname -s)" in
Darwin*) HOST_PLATFORM=darwin-x86_64 ;;
Linux*) HOST_PLATFORM=linux-x86_64 ;;
*) echo "Unsupported host: $(uname -s)" >&2; exit 1 ;;
esac
mkdir -p "$WORK_DIR" "$OUTPUT_DIR"
cd "$WORK_DIR"
# 1. Upstream sources — clone once, reuse on subsequent runs.
MEDIA3_DIR="$WORK_DIR/media3"
if [[ ! -d "$MEDIA3_DIR" ]]; then
echo "[ffmpeg-build] cloning Media3 @${MEDIA3_TAG}"
git clone --depth 1 --branch "$MEDIA3_TAG" \
https://github.com/androidx/media.git "$MEDIA3_DIR"
fi
FFMPEG_DIR="$MEDIA3_DIR/libraries/decoder_ffmpeg/src/main/jni/ffmpeg"
if [[ ! -d "$FFMPEG_DIR" ]]; then
echo "[ffmpeg-build] cloning FFmpeg @${FFMPEG_TAG}"
git clone --depth 1 --branch "$FFMPEG_TAG" \
https://git.ffmpeg.org/ffmpeg.git "$FFMPEG_DIR"
fi
# 2. Drop our extended JNI source + CMake config over the upstream copies
# so the build produces a video-capable libffmpegJNI.so.
JNI_BUILD_DIR="$MEDIA3_DIR/libraries/decoder_ffmpeg/src/main/jni"
cp "$JNI_SRC/ffmpeg_jni.cc" "$JNI_BUILD_DIR/ffmpeg_jni.cc"
cp "$JNI_SRC/CMakeLists.txt" "$JNI_BUILD_DIR/CMakeLists.txt"
# 3. Build FFmpeg static libs per ABI (H.264 decoder only). The
# sentinel below skips this step if all 4 ABIs already have the
# static libs from a previous run — important because the FFmpeg
# static build is the slow part (~30 min for 4 ABIs); subsequent
# Gradle runs just need to re-link libffmpegJNI.so (~5 sec / ABI).
MODULE_PATH="$MEDIA3_DIR/libraries/decoder_ffmpeg/src/main"
NEED_STATIC_BUILD=0
for ABI in $ABIS; do
if [[ ! -f "$JNI_BUILD_DIR/ffmpeg/android-libs/$ABI/libavcodec.a" ]]; then
NEED_STATIC_BUILD=1
break
fi
done
if [[ "$NEED_STATIC_BUILD" -eq 1 ]]; then
echo "[ffmpeg-build] building FFmpeg static libs (slow on first run)"
chmod +x "$JNI_BUILD_DIR/build_ffmpeg.sh"
"$JNI_BUILD_DIR/build_ffmpeg.sh" \
"$MODULE_PATH" "$NDK_PATH" "$HOST_PLATFORM" "$MIN_SDK" h264
else
echo "[ffmpeg-build] FFmpeg static libs already present, reusing"
fi
# 4. Cross-build libffmpegJNI.so per ABI via CMake + Ninja.
export PATH="$CMAKE_PATH:$PATH"
for ABI in $ABIS; do
ABI_BUILD_DIR="$WORK_DIR/jni-out/$ABI"
mkdir -p "$ABI_BUILD_DIR"
cmake -G Ninja \
-DCMAKE_TOOLCHAIN_FILE="$NDK_PATH/build/cmake/android.toolchain.cmake" \
-DANDROID_ABI="$ABI" \
-DANDROID_PLATFORM="android-$MIN_SDK" \
-DCMAKE_BUILD_TYPE=Release \
-S "$JNI_BUILD_DIR" -B "$ABI_BUILD_DIR" >/dev/null
ninja -C "$ABI_BUILD_DIR" >/dev/null
DEST="$OUTPUT_DIR/$ABI"
mkdir -p "$DEST"
cp "$ABI_BUILD_DIR/libffmpegJNI.so" "$DEST/libffmpegJNI.so"
done
echo "[ffmpeg-build] libffmpegJNI.so ready in $OUTPUT_DIR"

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android/ffmpeg/ffmpeg_jni.cc Normal file
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/*
* Copyright 2026 swipelab.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* JNI bridge for the ux FFmpeg video decoder. Exposes a small surface
* (init / sendPacket / receiveFrame / flush / release) that
* FfmpegVideoDecoder.java drives. The audio path was dropped — Media3's
* MediaCodec AAC decoder handles audio on every device we ship to.
*/
#include <android/log.h>
#include <jni.h>
#include <stdlib.h>
#include <string.h>
extern "C" {
#ifdef __cplusplus
#define __STDC_CONSTANT_MACROS
#ifdef _STDINT_H
#undef _STDINT_H
#endif
#include <stdint.h>
#endif
#include <libavcodec/avcodec.h>
#include <libavutil/error.h>
#include <libavutil/imgutils.h>
#include <libavutil/opt.h>
#include <libavutil/pixfmt.h>
}
#define LOG_TAG "ux_ffmpeg_jni"
#define LOGE(...) \
((void)__android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__))
#define LOGI(...) \
((void)__android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__))
#define LOGD(...) \
((void)__android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__))
#define LIBRARY_FUNC(RETURN_TYPE, NAME, ...) \
extern "C" { \
JNIEXPORT RETURN_TYPE \
Java_io_swipelab_ux_video_ffmpeg_FfmpegLibrary_##NAME(JNIEnv* env, \
jobject thiz, \
##__VA_ARGS__); \
} \
JNIEXPORT RETURN_TYPE \
Java_io_swipelab_ux_video_ffmpeg_FfmpegLibrary_##NAME( \
JNIEnv* env, jobject thiz, ##__VA_ARGS__)
#define VIDEO_DECODER_FUNC(RETURN_TYPE, NAME, ...) \
extern "C" { \
JNIEXPORT RETURN_TYPE \
Java_io_swipelab_ux_video_ffmpeg_FfmpegVideoDecoder_##NAME( \
JNIEnv* env, jobject thiz, ##__VA_ARGS__); \
} \
JNIEXPORT RETURN_TYPE \
Java_io_swipelab_ux_video_ffmpeg_FfmpegVideoDecoder_##NAME( \
JNIEnv* env, jobject thiz, ##__VA_ARGS__)
#define ERROR_STRING_BUFFER_LENGTH 256
// Mirrored in FfmpegVideoDecoder.java.
static const int VIDEO_DECODER_SUCCESS = 0;
static const int VIDEO_DECODER_ERROR_INVALID_DATA = -1;
static const int VIDEO_DECODER_ERROR_OTHER = -2;
static const int VIDEO_DECODER_READ_AGAIN = -3;
// VideoDecoderOutputBuffer.COLORSPACE_* mirror.
static const int COLORSPACE_UNKNOWN = 0;
static const int COLORSPACE_BT601 = 1;
static const int COLORSPACE_BT709 = 2;
static const int COLORSPACE_BT2020 = 3;
static jmethodID initForYuvFrameMethod;
static jfieldID dataField;
// Carries full-range info (1) vs limited-range info (0) per frame to
// Java so the GL shader picks the matching BT.709 conversion matrix.
static jfieldID decoderPrivateField;
// Reassigned per output frame to the decoded frame's actual PTS
// (NOT the input packet's PTS — for H.264 reorder, output display
// order differs from input decode order, and using the input PTS
// scrambles ExoPlayer's frame-late detection so it drops half the
// stream).
static jfieldID timeUsField;
static int colorspaceFromAVColorSpace(AVColorSpace cs) {
switch (cs) {
case AVCOL_SPC_BT709:
return COLORSPACE_BT709;
case AVCOL_SPC_BT470BG:
case AVCOL_SPC_SMPTE170M:
return COLORSPACE_BT601;
case AVCOL_SPC_BT2020_NCL:
case AVCOL_SPC_BT2020_CL:
return COLORSPACE_BT2020;
default:
return COLORSPACE_UNKNOWN;
}
}
static void logError(const char* fn, int err) {
char buf[ERROR_STRING_BUFFER_LENGTH] = {0};
av_strerror(err, buf, ERROR_STRING_BUFFER_LENGTH);
LOGE("Error in %s: %s", fn, buf);
}
static int transformError(int err) {
return err == AVERROR_INVALIDDATA ? VIDEO_DECODER_ERROR_INVALID_DATA
: VIDEO_DECODER_ERROR_OTHER;
}
// Decoder state held across JNI calls; the long handle returned by
// videoInitialize is a pointer to one of these. AVCodecContext alone
// isn't enough because we want a reusable AVFrame to avoid per-decode
// allocation churn.
struct UxFfmpegVideoContext {
AVCodecContext* codec_ctx = nullptr;
AVFrame* frame = nullptr;
};
static void releaseContext(UxFfmpegVideoContext* ctx) {
if (!ctx) return;
if (ctx->frame) {
av_frame_free(&ctx->frame);
}
if (ctx->codec_ctx) {
avcodec_free_context(&ctx->codec_ctx);
}
delete ctx;
}
jint JNI_OnLoad(JavaVM* vm, void* reserved) {
JNIEnv* env;
if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
LOGE("JNI_OnLoad: GetEnv failed");
return -1;
}
jclass clazz =
env->FindClass("androidx/media3/decoder/VideoDecoderOutputBuffer");
if (!clazz) {
LOGE("JNI_OnLoad: FindClass(VideoDecoderOutputBuffer) failed");
return -1;
}
initForYuvFrameMethod = env->GetMethodID(clazz, "initForYuvFrame", "(IIIII)Z");
if (!initForYuvFrameMethod) {
LOGE("JNI_OnLoad: GetMethodID(initForYuvFrame) failed");
return -1;
}
dataField = env->GetFieldID(clazz, "data", "Ljava/nio/ByteBuffer;");
if (!dataField) {
LOGE("JNI_OnLoad: GetFieldID(data) failed");
return -1;
}
decoderPrivateField = env->GetFieldID(clazz, "decoderPrivate", "J");
if (!decoderPrivateField) {
LOGE("JNI_OnLoad: GetFieldID(decoderPrivate) failed");
return -1;
}
// timeUs lives on the DecoderOutputBuffer base class but is
// discoverable via the concrete subclass.
timeUsField = env->GetFieldID(clazz, "timeUs", "J");
if (!timeUsField) {
LOGE("JNI_OnLoad: GetFieldID(timeUs) failed");
return -1;
}
return JNI_VERSION_1_6;
}
LIBRARY_FUNC(jstring, ffmpegGetVersion) {
return env->NewStringUTF(LIBAVCODEC_IDENT);
}
LIBRARY_FUNC(jint, ffmpegGetInputBufferPaddingSize) {
return (jint)AV_INPUT_BUFFER_PADDING_SIZE;
}
LIBRARY_FUNC(jboolean, ffmpegHasDecoder, jstring codecName) {
if (!codecName) return JNI_FALSE;
const char* name = env->GetStringUTFChars(codecName, nullptr);
const AVCodec* codec = avcodec_find_decoder_by_name(name);
env->ReleaseStringUTFChars(codecName, name);
return codec != nullptr;
}
VIDEO_DECODER_FUNC(jlong, ffmpegVideoInitialize, jstring codecName,
jbyteArray extraData, jint threads) {
if (!codecName) {
LOGE("ffmpegVideoInitialize: codecName is null");
return 0L;
}
const char* name = env->GetStringUTFChars(codecName, nullptr);
const AVCodec* codec = avcodec_find_decoder_by_name(name);
env->ReleaseStringUTFChars(codecName, name);
if (!codec) {
LOGE("ffmpegVideoInitialize: codec not found");
return 0L;
}
UxFfmpegVideoContext* ctx = new UxFfmpegVideoContext();
ctx->codec_ctx = avcodec_alloc_context3(codec);
if (!ctx->codec_ctx) {
LOGE("ffmpegVideoInitialize: avcodec_alloc_context3 failed");
releaseContext(ctx);
return 0L;
}
if (extraData) {
jsize size = env->GetArrayLength(extraData);
ctx->codec_ctx->extradata =
(uint8_t*)av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!ctx->codec_ctx->extradata) {
LOGE("ffmpegVideoInitialize: extradata alloc failed");
releaseContext(ctx);
return 0L;
}
env->GetByteArrayRegion(extraData, 0, size,
(jbyte*)ctx->codec_ctx->extradata);
ctx->codec_ctx->extradata_size = size;
}
ctx->codec_ctx->thread_count = threads > 0 ? threads : 0;
// Slice threading only. FRAME threading buffers thread_count
// input frames before producing output; that extra latency
// pushes frames past their PTS deadline and ExoPlayer drops
// them, leaving render rate well below source rate. Slice
// threading gives parallelism without the input-side delay.
ctx->codec_ctx->thread_type = FF_THREAD_SLICE;
ctx->codec_ctx->err_recognition = AV_EF_IGNORE_ERR;
// PTS values are passed in microseconds (Media3's native unit),
// and libavcodec propagates packet.pts → frame.pts through the
// reorder buffer so we can recover display-order timestamps on
// receive.
ctx->codec_ctx->time_base = AVRational{1, 1000000};
ctx->codec_ctx->pkt_timebase = AVRational{1, 1000000};
int result = avcodec_open2(ctx->codec_ctx, codec, nullptr);
if (result < 0) {
logError("avcodec_open2", result);
releaseContext(ctx);
return 0L;
}
ctx->frame = av_frame_alloc();
if (!ctx->frame) {
LOGE("ffmpegVideoInitialize: av_frame_alloc failed");
releaseContext(ctx);
return 0L;
}
return (jlong)ctx;
}
VIDEO_DECODER_FUNC(jint, ffmpegVideoSendPacket, jlong handle, jobject inputData,
jint inputSize, jlong ptsUs) {
if (!handle) {
LOGE("ffmpegVideoSendPacket: null handle");
return VIDEO_DECODER_ERROR_OTHER;
}
if (!inputData || inputSize <= 0) {
LOGE("ffmpegVideoSendPacket: bad input");
return VIDEO_DECODER_ERROR_OTHER;
}
UxFfmpegVideoContext* ctx = (UxFfmpegVideoContext*)handle;
uint8_t* buf = (uint8_t*)env->GetDirectBufferAddress(inputData);
AVPacket* pkt = av_packet_alloc();
if (!pkt) {
LOGE("ffmpegVideoSendPacket: av_packet_alloc failed");
return VIDEO_DECODER_ERROR_OTHER;
}
pkt->data = buf;
pkt->size = inputSize;
pkt->pts = (int64_t)ptsUs;
pkt->dts = AV_NOPTS_VALUE;
int result = avcodec_send_packet(ctx->codec_ctx, pkt);
av_packet_free(&pkt);
if (result == AVERROR(EAGAIN)) {
return VIDEO_DECODER_READ_AGAIN;
}
if (result < 0) {
logError("avcodec_send_packet", result);
return transformError(result);
}
return VIDEO_DECODER_SUCCESS;
}
// Pulls the next decoded frame and writes it into the Java
// VideoDecoderOutputBuffer's YUV planes. Returns:
// VIDEO_DECODER_SUCCESS -> frame written
// VIDEO_DECODER_READ_AGAIN -> no frame yet, send more packets
// VIDEO_DECODER_ERROR_* -> fatal
VIDEO_DECODER_FUNC(jint, ffmpegVideoReceiveFrame, jlong handle,
jobject outputBuffer) {
if (!handle) {
LOGE("ffmpegVideoReceiveFrame: null handle");
return VIDEO_DECODER_ERROR_OTHER;
}
UxFfmpegVideoContext* ctx = (UxFfmpegVideoContext*)handle;
int result = avcodec_receive_frame(ctx->codec_ctx, ctx->frame);
if (result == AVERROR(EAGAIN) || result == AVERROR_EOF) {
return VIDEO_DECODER_READ_AGAIN;
}
if (result < 0) {
logError("avcodec_receive_frame", result);
return transformError(result);
}
AVFrame* f = ctx->frame;
// Only planar 4:2:0 YUV is supported by VideoDecoderOutputBuffer's
// 3-plane layout. iOS H.264 produces YUV420P (limited range) or
// YUVJ420P (full range); identical memory layout, only range
// interpretation differs.
AVPixelFormat pix = (AVPixelFormat)f->format;
if (pix != AV_PIX_FMT_YUV420P && pix != AV_PIX_FMT_YUVJ420P) {
LOGE("ffmpegVideoReceiveFrame: unsupported pix_fmt=%d", pix);
av_frame_unref(f);
return VIDEO_DECODER_ERROR_OTHER;
}
int width = f->width;
int height = f->height;
int yStride = f->linesize[0];
int uvStride = f->linesize[1];
int colorspace = colorspaceFromAVColorSpace(f->colorspace);
if (colorspace == COLORSPACE_UNKNOWN) {
// iOS H.264 commonly leaves VUI fields unspecified; default to
// BT.709 for HD-shaped frames, BT.601 below SD width threshold.
colorspace = (width >= 1280 || height >= 720) ? COLORSPACE_BT709
: COLORSPACE_BT601;
}
jboolean ok = env->CallBooleanMethod(outputBuffer, initForYuvFrameMethod,
width, height, yStride, uvStride,
colorspace);
if (env->ExceptionCheck()) {
LOGE("initForYuvFrame threw");
env->ExceptionDescribe();
env->ExceptionClear();
av_frame_unref(f);
return VIDEO_DECODER_ERROR_OTHER;
}
if (!ok) {
LOGE("initForYuvFrame returned false (overflow?)");
av_frame_unref(f);
return VIDEO_DECODER_ERROR_OTHER;
}
// Display-order PTS recovered from libavcodec. The Java side
// initialised the buffer with the input packet's PTS; for B-frame
// streams that is the WRONG value because the frame we're about to
// emit was decoded out of input order. Overwriting with f->pts puts
// each output buffer back on the timeline ExoPlayer expects.
if (f->pts != AV_NOPTS_VALUE) {
env->SetLongField(outputBuffer, timeUsField, (jlong)f->pts);
}
// Copy each plane into the ByteBuffer that initForYuvFrame allocated.
jobject dataBuf = env->GetObjectField(outputBuffer, dataField);
if (!dataBuf) {
LOGE("ffmpegVideoReceiveFrame: data ByteBuffer is null after init");
av_frame_unref(f);
return VIDEO_DECODER_ERROR_OTHER;
}
uint8_t* dst = (uint8_t*)env->GetDirectBufferAddress(dataBuf);
if (!dst) {
LOGE("ffmpegVideoReceiveFrame: GetDirectBufferAddress null");
env->DeleteLocalRef(dataBuf);
av_frame_unref(f);
return VIDEO_DECODER_ERROR_OTHER;
}
int uvHeight = (height + 1) / 2;
int yLength = yStride * height;
int uvLength = uvStride * uvHeight;
// Plane 0: Y
memcpy(dst, f->data[0], yLength);
// Plane 1: U
memcpy(dst + yLength, f->data[1], uvLength);
// Plane 2: V
memcpy(dst + yLength + uvLength, f->data[2], uvLength);
// iOS yuvj420p / AVCOL_RANGE_JPEG => full-range YUV; the renderer's
// shader needs to skip the limited-range pre-scale on Y.
jlong rangeFlag = (pix == AV_PIX_FMT_YUVJ420P ||
f->color_range == AVCOL_RANGE_JPEG)
? 1L
: 0L;
env->SetLongField(outputBuffer, decoderPrivateField, rangeFlag);
env->DeleteLocalRef(dataBuf);
av_frame_unref(f);
return VIDEO_DECODER_SUCCESS;
}
VIDEO_DECODER_FUNC(void, ffmpegVideoFlush, jlong handle) {
if (!handle) return;
UxFfmpegVideoContext* ctx = (UxFfmpegVideoContext*)handle;
avcodec_flush_buffers(ctx->codec_ctx);
}
VIDEO_DECODER_FUNC(void, ffmpegVideoRelease, jlong handle) {
if (!handle) return;
releaseContext((UxFfmpegVideoContext*)handle);
}