android全平臺編譯ffmpeg視訊解碼器實踐
阿新 • • 發佈:2018-11-06
目錄
配置環境
作業系統: ubuntu 16.05
注意: ffmpeg庫
的編譯使用的是android-ndk-r10e版本
,使用高版本編譯會報錯
而android-studio
工程中配合cmake
使用的版本則是android-ndk-r16b版本
新建工程ffmpeg-single-hello
- 配置
build.gradle
如下
android {
......
defaultConfig {
......
externalNativeBuild {
cmake {
cppFlags ""
}
ndk {
abiFilters "armeabi-v7a"
}
}
sourceSets {
main {
//庫地址
jniLibs.srcDirs = ['libs']
}
}
}
......
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}
}
- 新建
CMakeLists.txt檔案
,配置如下
cmake_minimum_required(VERSION 3.4.1)
add_library(ffmpeg-decode
SHARED
src/main/cpp/ffmpeg_decode.c)
find_library(log-lib
log)
#獲取上級目錄
get_filename_component(PARENT_DIR ${ CMAKE_SOURCE_DIR} PATH)
set(LIBRARY_DIR ${PARENT_DIR}/ffmpeg-single)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
set(CMAKE_VERBOSE_MAKEFILE on)
add_library(ffmpeg-single
SHARED
IMPORTED)
set_target_properties(ffmpeg-single
PROPERTIES IMPORTED_LOCATION
${LIBRARY_DIR}/libs/${ANDROID_ABI}/libffmpeg.so
)
#標頭檔案
include_directories(${LIBRARY_DIR}/libs/${ANDROID_ABI}/include)
target_link_libraries(ffmpeg-decode ffmpeg-single ${log-lib})
- 新建類
FFmpegHello.java
package com.onzhou.ffmpeg.decode;
/**
* @anchor: andy
* @date: 2018-10-30
* @description:
*/
public class FFmpegDecode {
static {
System.loadLibrary("ffmpeg");
System.loadLibrary("ffmpeg-decode");
}
public native int decode(String input, String output);
}
- 在
src/main/cpp目錄
新建原始檔ffmpeg_decode.c
#include <stdio.h>
#include <time.h>
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/log.h"
#ifdef ANDROID
#include <jni.h>
#include <android/log.h>
#define LOGE(format, ...) __android_log_print(ANDROID_LOG_ERROR, "(>_<)", format, ##__VA_ARGS__)
#define LOGI(format, ...) __android_log_print(ANDROID_LOG_INFO, "(^_^)", format, ##__VA_ARGS__)
#else
#define LOGE(format, ...) printf("(>_<) " format "\n", ##__VA_ARGS__)
#define LOGI(format, ...) printf("(^_^) " format "\n", ##__VA_ARGS__)
#endif
//輸出日誌
void log_callback(void *ptr, int level, const char *fmt, va_list vl) {
FILE *fp = fopen("/storage/emulated/0/Android/data/com.onzhou.ffmpeg.decode/files/av_log.txt",
"a+");
if (fp) {
vfprintf(fp, fmt, vl);
fflush(fp);
fclose(fp);
}
}
JNIEXPORT jint JNICALL Java_com_onzhou_ffmpeg_decode_FFmpegDecode_decode
(JNIEnv *env, jobject obj, jstring input_jstr, jstring output_jstr) {
AVFormatContext *pFormatCtx;
int i, videoindex;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame, *pFrameYUV;
uint8_t *out_buffer;
AVPacket *packet;
int y_size;
int ret, got_picture;
struct SwsContext *img_convert_ctx;
FILE *fp_yuv;
int frame_cnt;
clock_t time_start, time_finish;
double time_duration = 0.0;
char input_str[500] = {0};
char output_str[500] = {0};
char info[1000] = {0};
sprintf(input_str, "%s", (*env)->GetStringUTFChars(env, input_jstr, NULL));
sprintf(output_str, "%s", (*env)->GetStringUTFChars(env, output_jstr, NULL));
//日誌回撥
av_log_set_callback(log_callback);
av_register_all();
avformat_network_init();
pFormatCtx = avformat_alloc_context();
if (avformat_open_input(&pFormatCtx, input_str, NULL, NULL) != 0) {
LOGE("Couldn't open input stream.\n");
return -1;
}
if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
LOGE("Couldn't find stream information.\n");
return -1;
}
videoindex = -1;
for (i = 0; i < pFormatCtx->nb_streams; i++)
if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
videoindex = i;
break;
}
if (videoindex == -1) {
LOGE("Couldn't find a video stream.\n");
return -1;
}
pCodecCtx = pFormatCtx->streams[videoindex]->codec;
pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
if (pCodec == NULL) {
LOGE("Couldn't find Codec.\n");
return -1;
}
if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
LOGE("Couldn't open codec.\n");
return -1;
}
pFrame = av_frame_alloc();
pFrameYUV = av_frame_alloc();
out_buffer = (unsigned char *) av_malloc(
av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1));
av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer,
AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1);
packet = (AVPacket *) av_malloc(sizeof(AVPacket));
img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,
pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P,
SWS_BICUBIC, NULL, NULL, NULL);
sprintf(info, "[Input ]%s\n", input_str);
sprintf(info, "%s[Output ]%s\n", info, output_str);
sprintf(info, "%s[Format ]%s\n", info, pFormatCtx->iformat->name);
sprintf(info, "%s[Codec ]%s\n", info, pCodecCtx->codec->name);
sprintf(info, "%s[Resolution]%dx%d\n", info, pCodecCtx->width, pCodecCtx->height);
fp_yuv = fopen(output_str, "wb+");
if (fp_yuv == NULL) {
printf("Cannot open output file.\n");
return -1;
}
frame_cnt = 0;
time_start = clock();
while (av_read_frame(pFormatCtx, packet) >= 0) {
if (packet->stream_index == videoindex) {
ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
if (ret < 0) {
LOGE("Decode Error.\n");
return -1;
}
if (got_picture) {
sws_scale(img_convert_ctx, (const uint8_t *const *) pFrame->data, pFrame->linesize,
0, pCodecCtx->height,
pFrameYUV->data, pFrameYUV->linesize);
y_size = pCodecCtx->width * pCodecCtx->height;
fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv); //Y
fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv); //U
fwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv); //V
//Output info
char pictype_str[10] = {0};
switch (pFrame->pict_type) {
case AV_PICTURE_TYPE_I:
sprintf(pictype_str, "I");
break;
case AV_PICTURE_TYPE_P:
sprintf(pictype_str, "P");
break;
case AV_PICTURE_TYPE_B:
sprintf(pictype_str, "B");
break;
default:
sprintf(pictype_str, "Other");
break;
}
LOGI("Frame Index: %5d. Type:%s", frame_cnt, pictype_str);
frame_cnt++;
}
}
av_free_packet(packet);
}
//flush decoder
//FIX: Flush Frames remained in Codec
while (1) {
ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
if (ret < 0)
break;
if (!got_picture)
break;
sws_scale(img_convert_ctx, (const uint8_t *const *) pFrame->data, pFrame->linesize, 0,
pCodecCtx->height,
pFrameYUV->data, pFrameYUV->linesize);
int y_size = pCodecCtx->width * pCodecCtx->height;
fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv); //Y
fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv); //U
fwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv); //V
//Output info
char pictype_str[10] = {0};
switch (pFrame->pict_type) {
case AV_PICTURE_TYPE_I:
sprintf(pictype_str, "I");
break;
case AV_PICTURE_TYPE_P:
sprintf(pictype_str, "P");
break;
case AV_PICTURE_TYPE_B:
sprintf(pictype_str, "B");
break;
default:
sprintf(pictype_str, "Other");
break;
}
LOGI("Frame Index: %5d. Type:%s", frame_cnt, pictype_str);
frame_cnt++;
}
time_finish = clock();
time_duration = (double) (time_finish - time_start);
sprintf(info, "%s[Time ]%fms\n", info, time_duration);
sprintf(info, "%s[Count ]%d\n", info, frame_cnt);
sws_freeContext(img_convert_ctx);
fclose(fp_yuv);
av_frame_free(&pFrameYUV);
av_frame_free(&pFrame);
avcodec_close(pCodecCtx);
avformat_close_input(&pFormatCtx);
return 0;
}
public void onDecodeClick(View view) {
if (fFmpegDecode == null) {
fFmpegDecode = new FFmpegDecode();
}
btnDecode.setEnabled(false);
final File fileDir = getExternalFilesDir(null);
Schedulers.newThread().scheduleDirect(new Runnable() {
@Override
public void run() {
fFmpegDecode.decode(fileDir.getAbsolutePath() + "/input.mp4", fileDir.getAbsolutePath() + "/output.yuv");
}
});
}
- 編譯打包執行,
輸出如下資訊:
輸出的yuv檔案體積很大
專案地址:
https://github.com/byhook/ffmpeg4android
參考雷神:
https://blog.csdn.net/leixiaohua1020/article/details/47010637