ijkplayer框架简析 -- 从构造到 onPrepared
从本文开始讲解 ijkplayer 相关的，本篇主要将播放器从初始化到 onPrepared
回调回来之间的操作
构造方法
public final class IjkMediaPlayer extends AbstractMediaPlayer {
/**
* Default library loader
* Load them by yourself, if your libraries are not installed at default place.
*/
private static final IjkLibLoader sLocalLibLoader = new IjkLibLoader() {
@Override
public void loadLibrary(String libName) throws UnsatisfiedLinkError, SecurityException {
System.loadLibrary(libName);
}
};
/**
* Default constructor. Consider using one of the create() methods for
* synchronously instantiating a IjkMediaPlayer from a Uri or resource.
* <p>
* When done with the IjkMediaPlayer, you should call {@link #release()}, to
* free the resources. If not released, too many IjkMediaPlayer instances
* may result in an exception.
* </p>
*/
public IjkMediaPlayer() {
this(sLocalLibLoader);
}
/**
* do not loadLibaray
* @param libLoader
* custom library loader, can be null.
*/
public IjkMediaPlayer(IjkLibLoader libLoader) {
initPlayer(libLoader);
}
private void initPlayer(IjkLibLoader libLoader) {
loadLibrariesOnce(libLoader);
initNativeOnce();
Looper looper;
if ((looper = Looper.myLooper()) != null) {
mEventHandler = new EventHandler(this, looper);
} else if ((looper = Looper.getMainLooper()) != null) {
mEventHandler = new EventHandler(this, looper);
} else {
mEventHandler = null;
}
/*
* Native setup requires a weak reference to our object. It's easier to
* create it here than in C++.
*/
native_setup(new WeakReference<IjkMediaPlayer>(this));
}
}
在构造方法的 initPlayer()
方法中，一次调用了 loadLibrariesOnce()
、 initNativeOnce()
、 创建 Looper 和 native_setup
loadLibrariesOnce
public final class IjkMediaPlayer extends AbstractMediaPlayer {
private static volatile boolean mIsLibLoaded = false;
public static void loadLibrariesOnce(IjkLibLoader libLoader) {
synchronized (IjkMediaPlayer.class) {
if (!mIsLibLoaded) {
if (libLoader == null)
libLoader = sLocalLibLoader;
libLoader.loadLibrary("ijkffmpeg");
libLoader.loadLibrary("ijksdl");
libLoader.loadLibrary("ijkplayer");
mIsLibLoaded = true;
}
}
}
}
loadLibrariesOnce()
中通过调用 IjkLibLoader 的 loadLibrary()
方法来加载 ijkplayer 的三个 so 库，最终是通过调用 System.loadLibrary()
来加载的 so
同时在 native 层与 java 方法的对应是通过 JNI_OnLoad()
来匹配的，卸载时会调用 JNI_UnLoad()
JNIEXPORT jint JNI_OnLoad(JavaVM *vm, void *reserved)
{
JNIEnv* env = NULL;
g_jvm = vm;
if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) {
return -1;
}
assert(env != NULL);
pthread_mutex_init(&g_clazz.mutex, NULL );
// FindClass returns LocalReference
IJK_FIND_JAVA_CLASS(env, g_clazz.clazz, JNI_CLASS_IJKPLAYER);
(*env)->RegisterNatives(env, g_clazz.clazz, g_methods, NELEM(g_methods) );
ijkmp_global_init();
ijkmp_global_set_inject_callback(inject_callback);
FFmpegApi_global_init(env);
return JNI_VERSION_1_4;
}
JNIEXPORT void JNI_OnUnload(JavaVM *jvm, void *reserved)
{
ijkmp_global_uninit();
pthread_mutex_destroy(&g_clazz.mutex);
}
首先 RegisterNatives
注册 g_methods
中的 native 方法
static JNINativeMethod g_methods[] = {
{
"_setDataSource",
"(Ljava/lang/String;[Ljava/lang/String;[Ljava/lang/String;)V",
(void *) IjkMediaPlayer_setDataSourceAndHeaders
},
{ "_setDataSourceFd", "(I)V", (void *) IjkMediaPlayer_setDataSourceFd },
{ "_setDataSource", "(Ltv/danmaku/ijk/media/player/misc/IMediaDataSource;)V", (void *)IjkMediaPlayer_setDataSourceCallback },
{ "_setAndroidIOCallback", "(Ltv/danmaku/ijk/media/player/misc/IAndroidIO;)V", (void *)IjkMediaPlayer_setAndroidIOCallback },
{ "_setVideoSurface", "(Landroid/view/Surface;)V", (void *) IjkMediaPlayer_setVideoSurface },
{ "_prepareAsync", "()V", (void *) IjkMediaPlayer_prepareAsync },
{ "_start", "()V", (void *) IjkMediaPlayer_start },
{ "_stop", "()V", (void *) IjkMediaPlayer_stop },
{ "seekTo", "(J)V", (void *) IjkMediaPlayer_seekTo },
{ "_pause", "()V", (void *) IjkMediaPlayer_pause },
{ "isPlaying", "()Z", (void *) IjkMediaPlayer_isPlaying },
{ "getCurrentPosition", "()J", (void *) IjkMediaPlayer_getCurrentPosition },
{ "getDuration", "()J", (void *) IjkMediaPlayer_getDuration },
{ "_release", "()V", (void *) IjkMediaPlayer_release },
{ "_reset", "()V", (void *) IjkMediaPlayer_reset },
{ "setVolume", "(FF)V", (void *) IjkMediaPlayer_setVolume },
{ "getAudioSessionId", "()I", (void *) IjkMediaPlayer_getAudioSessionId },
{ "native_init", "()V", (void *) IjkMediaPlayer_native_init },
{ "native_setup", "(Ljava/lang/Object;)V", (void *) IjkMediaPlayer_native_setup },
{ "native_finalize", "()V", (void *) IjkMediaPlayer_native_finalize },
{ "_setOption", "(ILjava/lang/String;Ljava/lang/String;)V", (void *) IjkMediaPlayer_setOption },
{ "_setOption", "(ILjava/lang/String;J)V", (void *) IjkMediaPlayer_setOptionLong },
{ "_getColorFormatName", "(I)Ljava/lang/String;", (void *) IjkMediaPlayer_getColorFormatName },
{ "_getVideoCodecInfo", "()Ljava/lang/String;", (void *) IjkMediaPlayer_getVideoCodecInfo },
{ "_getAudioCodecInfo", "()Ljava/lang/String;", (void *) IjkMediaPlayer_getAudioCodecInfo },
{ "_getMediaMeta", "()Landroid/os/Bundle;", (void *) IjkMediaPlayer_getMediaMeta },
{ "_setLoopCount", "(I)V", (void *) IjkMediaPlayer_setLoopCount },
{ "_getLoopCount", "()I", (void *) IjkMediaPlayer_getLoopCount },
{ "_getPropertyFloat", "(IF)F", (void *) ijkMediaPlayer_getPropertyFloat },
{ "_setPropertyFloat", "(IF)V", (void *) ijkMediaPlayer_setPropertyFloat },
{ "_getPropertyLong", "(IJ)J", (void *) ijkMediaPlayer_getPropertyLong },
{ "_setPropertyLong", "(IJ)V", (void *) ijkMediaPlayer_setPropertyLong },
{ "_setStreamSelected", "(IZ)V", (void *) ijkMediaPlayer_setStreamSelected },
{ "native_profileBegin", "(Ljava/lang/String;)V", (void *) IjkMediaPlayer_native_profileBegin },
{ "native_profileEnd", "()V", (void *) IjkMediaPlayer_native_profileEnd },
{ "native_setLogLevel", "(I)V", (void *) IjkMediaPlayer_native_setLogLevel },
{ "_setFrameAtTime", "(Ljava/lang/String;JJII)V", (void *) IjkMediaPlayer_setFrameAtTime },
};
注册之后 native 和 java 方法就对应起来了
接着调用了一些 init 方法
-
ijkmp_global_init()初始化 ffmpeg -
ijkmp_global_set_inject_callback()赋值 inject_callback -
FFmpegApi_global_init()初始化FFmpegApi#av_base64_encode()
ijkmp_global_init
void ijkmp_global_init()
{
ffp_global_init();
}
void ffp_global_init()
{
if (g_ffmpeg_global_inited)
return;
ALOGD("ijkmediaplayer version : %s", ijkmp_version());
/* register all codecs, demux and protocols */
avcodec_register_all();
#if CONFIG_AVDEVICE
avdevice_register_all();
#endif
#if CONFIG_AVFILTER
avfilter_register_all();
#endif
av_register_all();
ijkav_register_all();
avformat_network_init();
av_lockmgr_register(lockmgr);
av_log_set_callback(ffp_log_callback_brief);
av_init_packet(&flush_pkt);
flush_pkt.data = (uint8_t *)&flush_pkt;
g_ffmpeg_global_inited = true;
}
在 ffp_global_init()
方法中进行了一系列的 register 和 init，其中就包括了 av_register_all()
initNativeOnce
public final class IjkMediaPlayer extends AbstractMediaPlayer {
private static volatile boolean mIsNativeInitialized = false;
private static void initNativeOnce() {
synchronized (IjkMediaPlayer.class) {
if (!mIsNativeInitialized) {
native_init();
mIsNativeInitialized = true;
}
}
}
private static native void native_init();
}
initNativeOnce()
最终调用了 native 的 IjkMediaPlayer_native_init()
方法
static void
IjkMediaPlayer_native_init(JNIEnv *env)
{
MPTRACE("%s/n", __func__);
}
native_setup
static void
IjkMediaPlayer_native_setup(JNIEnv *env, jobject thiz, jobject weak_this)
{
MPTRACE("%s/n", __func__);
IjkMediaPlayer *mp = ijkmp_android_create(message_loop);
JNI_CHECK_GOTO(mp, env, "java/lang/OutOfMemoryError", "mpjni: native_setup: ijkmp_create() failed", LABEL_RETURN);
jni_set_media_player(env, thiz, mp);
ijkmp_set_weak_thiz(mp, (*env)->NewGlobalRef(env, weak_this));
ijkmp_set_inject_opaque(mp, ijkmp_get_weak_thiz(mp));
ijkmp_set_ijkio_inject_opaque(mp, ijkmp_get_weak_thiz(mp));
ijkmp_android_set_mediacodec_select_callback(mp, mediacodec_select_callback, ijkmp_get_weak_thiz(mp));
LABEL_RETURN:
ijkmp_dec_ref_p(&mp);
}
先看 ijkmp_android_create()
方法：
IjkMediaPlayer *ijkmp_android_create(int(*msg_loop)(void*))
{
IjkMediaPlayer *mp = ijkmp_create(msg_loop);
if (!mp)
goto fail;
mp->ffplayer->vout = SDL_VoutAndroid_CreateForAndroidSurface();
if (!mp->ffplayer->vout)
goto fail;
mp->ffplayer->pipeline = ffpipeline_create_from_android(mp->ffplayer);
if (!mp->ffplayer->pipeline)
goto fail;
ffpipeline_set_vout(mp->ffplayer->pipeline, mp->ffplayer->vout);
return mp;
fail:
ijkmp_dec_ref_p(&mp);
return NULL;
}
ijkmp_create()
就是去创建个 IjkMediaPlayer 对象，指定了 msg_loop 对象，同时指定了 ffplayer 对象；接下来通过 SDL_VoutAndroid_CreateForAndroidSurface()
创建 vout，在 ffpipeline_set_vout()
对 ffplayer 的输出 vout 进行配置
setDataSource
setDataSource()
设置视频源，对应到 native 层是 IjkMediaPlayer_setDataSourceCallback()
static void
IjkMediaPlayer_setDataSourceCallback(JNIEnv *env, jobject thiz, jobject callback)
{
MPTRACE("%s/n", __func__);
int retval = 0;
char uri[128];
int64_t nativeMediaDataSource = 0;
IjkMediaPlayer *mp = jni_get_media_player(env, thiz);
JNI_CHECK_GOTO(callback, env, "java/lang/IllegalArgumentException", "mpjni: setDataSourceCallback: null fd", LABEL_RETURN);
JNI_CHECK_GOTO(mp, env, "java/lang/IllegalStateException", "mpjni: setDataSourceCallback: null mp", LABEL_RETURN);
nativeMediaDataSource = jni_set_media_data_source(env, thiz, callback);
JNI_CHECK_GOTO(nativeMediaDataSource, env, "java/lang/IllegalStateException", "mpjni: jni_set_media_data_source: NewGlobalRef", LABEL_RETURN);
ALOGV("setDataSourceCallback: %"PRId64"/n", nativeMediaDataSource);
snprintf(uri, sizeof(uri), "ijkmediadatasource:%"PRId64, nativeMediaDataSource);
retval = ijkmp_set_data_source(mp, uri);
IJK_CHECK_MPRET_GOTO(retval, env, LABEL_RETURN);
LABEL_RETURN:
ijkmp_dec_ref_p(&mp);
}
跟到 ijkmp_set_data_source()
去
static int ijkmp_set_data_source_l(IjkMediaPlayer *mp, const char *url)
{
assert(mp);
assert(url);
// MPST_RET_IF_EQ(mp->mp_state, MP_STATE_IDLE);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_INITIALIZED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_ASYNC_PREPARING);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_PREPARED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_STARTED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_PAUSED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_COMPLETED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_STOPPED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_ERROR);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_END);
freep((void**)&mp->data_source);
mp->data_source = strdup(url);
if (!mp->data_source)
return EIJK_OUT_OF_MEMORY;
ijkmp_change_state_l(mp, MP_STATE_INITIALIZED);
return 0;
}
这里看出 IjkMediaPlayer 中也应该是又一套状态机，默认情况是 MP_STATE_IDLE
，接着看 ijkmp_change_state_l()
方法
void ijkmp_change_state_l(IjkMediaPlayer *mp, int new_state)
{
mp->mp_state = new_state;
ffp_notify_msg1(mp->ffplayer, FFP_MSG_PLAYBACK_STATE_CHANGED);
}
将播放器的状态改为 MP_STATE_INITIALIZED
，然后再将 FFP_MSG_PLAYBACK_STATE_CHANGED
消息通过 ffp_notify_msg1()
传出去
对应接收的地方：
static void message_loop_n(JNIEnv *env, IjkMediaPlayer *mp)
{
jobject weak_thiz = (jobject) ijkmp_get_weak_thiz(mp);
JNI_CHECK_GOTO(weak_thiz, env, NULL, "mpjni: message_loop_n: null weak_thiz", LABEL_RETURN);
while (1) {
AVMessage msg;
int retval = ijkmp_get_msg(mp, &msg, 1);
if (retval < 0)
break;
// block-get should never return 0
assert(retval > 0);
switch (msg.what) {
// ..........
case FFP_MSG_PLAYBACK_STATE_CHANGED:
break;
default:
ALOGE("unknown FFP_MSG_xxx(%d)/n", msg.what);
break;
}
msg_free_res(&msg);
}
LABEL_RETURN:
;
}
prepareAsync
prepareAsync()
是去准备视频，对应到 native 层是 IjkMediaPlayer_prepareAsync()
static void
IjkMediaPlayer_prepareAsync(JNIEnv *env, jobject thiz)
{
MPTRACE("%s/n", __func__);
int retval = 0;
IjkMediaPlayer *mp = jni_get_media_player(env, thiz);
JNI_CHECK_GOTO(mp, env, "java/lang/IllegalStateException", "mpjni: prepareAsync: null mp", LABEL_RETURN);
retval = ijkmp_prepare_async(mp);
IJK_CHECK_MPRET_GOTO(retval, env, LABEL_RETURN);
LABEL_RETURN:
ijkmp_dec_ref_p(&mp);
}
接着看 ijkmp_prepare_async()
int ijkmp_prepare_async(IjkMediaPlayer *mp)
{
assert(mp);
MPTRACE("ijkmp_prepare_async()/n");
pthread_mutex_lock(&mp->mutex);
int retval = ijkmp_prepare_async_l(mp);
pthread_mutex_unlock(&mp->mutex);
MPTRACE("ijkmp_prepare_async()=%d/n", retval);
return retval;
}
最后调用的是 ijkmp_prepare_async_l()
static int ijkmp_prepare_async_l(IjkMediaPlayer *mp)
{
assert(mp);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_IDLE);
// MPST_RET_IF_EQ(mp->mp_state, MP_STATE_INITIALIZED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_ASYNC_PREPARING);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_PREPARED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_STARTED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_PAUSED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_COMPLETED);
// MPST_RET_IF_EQ(mp->mp_state, MP_STATE_STOPPED);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_ERROR);
MPST_RET_IF_EQ(mp->mp_state, MP_STATE_END);
assert(mp->data_source);
ijkmp_change_state_l(mp, MP_STATE_ASYNC_PREPARING);
msg_queue_start(&mp->ffplayer->msg_queue);
// released in msg_loop
ijkmp_inc_ref(mp);
mp->msg_thread = SDL_CreateThreadEx(&mp->_msg_thread, ijkmp_msg_loop, mp, "ff_msg_loop");
// msg_thread is detached inside msg_loop
// TODO: 9 release weak_thiz if pthread_create() failed;
int retval = ffp_prepare_async_l(mp->ffplayer, mp->data_source);
if (retval < 0) {
ijkmp_change_state_l(mp, MP_STATE_ERROR);
return retval;
}
return 0;
}
MP_STATE_ASYNC_PREPARING ffp_prepare_async_l()
int ffp_prepare_async_l(FFPlayer *ffp, const char *file_name)
{
assert(ffp);
assert(!ffp->is);
assert(file_name);
if (av_stristart(file_name, "rtmp", NULL) ||
av_stristart(file_name, "rtsp", NULL)) {
// There is total different meaning for 'timeout' option in rtmp
av_log(ffp, AV_LOG_WARNING, "remove 'timeout' option for rtmp./n");
av_dict_set(&ffp->format_opts, "timeout", NULL, 0);
}
/* there is a length limit in avformat */
if (strlen(file_name) + 1 > 1024) {
av_log(ffp, AV_LOG_ERROR, "%s too long url/n", __func__);
if (avio_find_protocol_name("ijklongurl:")) {
av_dict_set(&ffp->format_opts, "ijklongurl-url", file_name, 0);
file_name = "ijklongurl:";
}
}
av_log(NULL, AV_LOG_INFO, "===== versions =====/n");
ffp_show_version_str(ffp, "ijkplayer", ijk_version_info());
ffp_show_version_str(ffp, "FFmpeg", av_version_info());
ffp_show_version_int(ffp, "libavutil", avutil_version());
ffp_show_version_int(ffp, "libavcodec", avcodec_version());
ffp_show_version_int(ffp, "libavformat", avformat_version());
ffp_show_version_int(ffp, "libswscale", swscale_version());
ffp_show_version_int(ffp, "libswresample", swresample_version());
av_log(NULL, AV_LOG_INFO, "===== options =====/n");
ffp_show_dict(ffp, "player-opts", ffp->player_opts);
ffp_show_dict(ffp, "format-opts", ffp->format_opts);
ffp_show_dict(ffp, "codec-opts ", ffp->codec_opts);
ffp_show_dict(ffp, "sws-opts ", ffp->sws_dict);
ffp_show_dict(ffp, "swr-opts ", ffp->swr_opts);
av_log(NULL, AV_LOG_INFO, "===================/n");
av_opt_set_dict(ffp, &ffp->player_opts);
if (!ffp->aout) {
ffp->aout = ffpipeline_open_audio_output(ffp->pipeline, ffp);
if (!ffp->aout)
return -1;
}
#if CONFIG_AVFILTER
if (ffp->vfilter0) {
GROW_ARRAY(ffp->vfilters_list, ffp->nb_vfilters);
ffp->vfilters_list[ffp->nb_vfilters - 1] = ffp->vfilter0;
}
#endif
VideoState *is = stream_open(ffp, file_name, NULL);
if (!is) {
av_log(NULL, AV_LOG_WARNING, "ffp_prepare_async_l: stream_open failed OOM");
return EIJK_OUT_OF_MEMORY;
}
ffp->is = is;
ffp->input_filename = av_strdup(file_name);
return 0;
}
- 针对 rtmp 或 rtsp 协议去掉超时 timeout 的 options
- 对长 url 进行处理
- 打印 log 信息
-
调用
stream_open()方法， 如果该方法失败，则播放失败
stream_open
static VideoState *stream_open(FFPlayer *ffp, const char *filename, AVInputFormat *iformat)
{
assert(!ffp->is);
VideoState *is;
is = av_mallocz(sizeof(VideoState));
if (!is)
return NULL;
is->filename = av_strdup(filename);
if (!is->filename)
goto fail;
is->iformat = iformat;
is->ytop = 0;
is->xleft = 0;
#if defined(__ANDROID__)
if (ffp->soundtouch_enable) {
is->handle = ijk_soundtouch_create();
}
#endif
/* start video display */
if (frame_queue_init(&is->pictq, &is->videoq, ffp->pictq_size, 1) < 0)
goto fail;
if (frame_queue_init(&is->subpq, &is->subtitleq, SUBPICTURE_QUEUE_SIZE, 0) < 0)
goto fail;
if (frame_queue_init(&is->sampq, &is->audioq, SAMPLE_QUEUE_SIZE, 1) < 0)
goto fail;
if (packet_queue_init(&is->videoq) < 0 ||
packet_queue_init(&is->audioq) < 0 ||
packet_queue_init(&is->subtitleq) < 0)
goto fail;
if (!(is->continue_read_thread = SDL_CreateCond())) {
av_log(NULL, AV_LOG_FATAL, "SDL_CreateCond(): %s/n", SDL_GetError());
goto fail;
}
if (!(is->video_accurate_seek_cond = SDL_CreateCond())) {
av_log(NULL, AV_LOG_FATAL, "SDL_CreateCond(): %s/n", SDL_GetError());
ffp->enable_accurate_seek = 0;
}
if (!(is->audio_accurate_seek_cond = SDL_CreateCond())) {
av_log(NULL, AV_LOG_FATAL, "SDL_CreateCond(): %s/n", SDL_GetError());
ffp->enable_accurate_seek = 0;
}
init_clock(&is->vidclk, &is->videoq.serial);
init_clock(&is->audclk, &is->audioq.serial);
init_clock(&is->extclk, &is->extclk.serial);
is->audio_clock_serial = -1;
if (ffp->startup_volume < 0)
av_log(NULL, AV_LOG_WARNING, "-volume=%d < 0, setting to 0/n", ffp->startup_volume);
if (ffp->startup_volume > 100)
av_log(NULL, AV_LOG_WARNING, "-volume=%d > 100, setting to 100/n", ffp->startup_volume);
ffp->startup_volume = av_clip(ffp->startup_volume, 0, 100);
ffp->startup_volume = av_clip(SDL_MIX_MAXVOLUME * ffp->startup_volume / 100, 0, SDL_MIX_MAXVOLUME);
is->audio_volume = ffp->startup_volume;
is->muted = 0;
is->av_sync_type = ffp->av_sync_type;
is->play_mutex = SDL_CreateMutex();
is->accurate_seek_mutex = SDL_CreateMutex();
ffp->is = is;
is->pause_req = !ffp->start_on_prepared;
is->video_refresh_tid = SDL_CreateThreadEx(&is->_video_refresh_tid, video_refresh_thread, ffp, "ff_vout");
if (!is->video_refresh_tid) {
av_freep(&ffp->is);
return NULL;
}
is->initialized_decoder = 0;
is->read_tid = SDL_CreateThreadEx(&is->_read_tid, read_thread, ffp, "ff_read");
if (!is->read_tid) {
av_log(NULL, AV_LOG_FATAL, "SDL_CreateThread(): %s/n", SDL_GetError());
goto fail;
}
if (ffp->async_init_decoder && !ffp->video_disable && ffp->video_mime_type && strlen(ffp->video_mime_type) > 0
&& ffp->mediacodec_default_name && strlen(ffp->mediacodec_default_name) > 0) {
if (ffp->mediacodec_all_videos || ffp->mediacodec_avc || ffp->mediacodec_hevc || ffp->mediacodec_mpeg2) {
decoder_init(&is->viddec, NULL, &is->videoq, is->continue_read_thread);
ffp->node_vdec = ffpipeline_init_video_decoder(ffp->pipeline, ffp);
}
}
is->initialized_decoder = 1;
return is;
fail:
is->initialized_decoder = 1;
is->abort_request = true;
if (is->video_refresh_tid)
SDL_WaitThread(is->video_refresh_tid, NULL);
stream_close(ffp);
return NULL;
}
对 frame queue、 packet queue 和 clock 分别进行了初始化，同时在该方法中创建了两个线程
ff_vout ff_read
read_thread
/* this thread gets the stream from the disk or the network */
static int read_thread(void *arg)
{
FFPlayer *ffp = arg;
VideoState *is = ffp->is;
AVFormatContext *ic = NULL;
int err, i, ret __unused;
int st_index[AVMEDIA_TYPE_NB];
AVPacket pkt1, *pkt = &pkt1;
int64_t stream_start_time;
int completed = 0;
int pkt_in_play_range = 0;
AVDictionaryEntry *t;
SDL_mutex *wait_mutex = SDL_CreateMutex();
int scan_all_pmts_set = 0;
int64_t pkt_ts;
int last_error = 0;
int64_t prev_io_tick_counter = 0;
int64_t io_tick_counter = 0;
int init_ijkmeta = 0;
if (!wait_mutex) {
av_log(NULL, AV_LOG_FATAL, "SDL_CreateMutex(): %s/n", SDL_GetError());
ret = AVERROR(ENOMEM);
goto fail;
}
memset(st_index, -1, sizeof(st_index));
is->last_video_stream = is->video_stream = -1;
is->last_audio_stream = is->audio_stream = -1;
is->last_subtitle_stream = is->subtitle_stream = -1;
is->eof = 0;
ic = avformat_alloc_context();
if (!ic) {
av_log(NULL, AV_LOG_FATAL, "Could not allocate context./n");
ret = AVERROR(ENOMEM);
goto fail;
}
ic->interrupt_callback.callback = decode_interrupt_cb;
ic->interrupt_callback.opaque = is;
if (!av_dict_get(ffp->format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE)) {
av_dict_set(&ffp->format_opts, "scan_all_pmts", "1", AV_DICT_DONT_OVERWRITE);
scan_all_pmts_set = 1;
}
if (av_stristart(is->filename, "rtmp", NULL) ||
av_stristart(is->filename, "rtsp", NULL)) {
// There is total different meaning for 'timeout' option in rtmp
av_log(ffp, AV_LOG_WARNING, "remove 'timeout' option for rtmp./n");
av_dict_set(&ffp->format_opts, "timeout", NULL, 0);
}
if (ffp->skip_calc_frame_rate) {
av_dict_set_int(&ic->metadata, "skip-calc-frame-rate", ffp->skip_calc_frame_rate, 0);
av_dict_set_int(&ffp->format_opts, "skip-calc-frame-rate", ffp->skip_calc_frame_rate, 0);
}
if (ffp->iformat_name)
is->iformat = av_find_input_format(ffp->iformat_name);
err = avformat_open_input(&ic, is->filename, is->iformat, &ffp->format_opts);
if (err < 0) {
print_error(is->filename, err);
ret = -1;
goto fail;
}
ffp_notify_msg1(ffp, FFP_MSG_OPEN_INPUT);
if (scan_all_pmts_set)
av_dict_set(&ffp->format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE);
if ((t = av_dict_get(ffp->format_opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
av_log(NULL, AV_LOG_ERROR, "Option %s not found./n", t->key);
#ifdef FFP_MERGE
ret = AVERROR_OPTION_NOT_FOUND;
goto fail;
#endif
}
is->ic = ic;
if (ffp->genpts)
ic->flags |= AVFMT_FLAG_GENPTS;
av_format_inject_global_side_data(ic);
//
//AVDictionary **opts;
//int orig_nb_streams;
//opts = setup_find_stream_info_opts(ic, ffp->codec_opts);
//orig_nb_streams = ic->nb_streams;
if (ffp->find_stream_info) {
AVDictionary **opts = setup_find_stream_info_opts(ic, ffp->codec_opts);
int orig_nb_streams = ic->nb_streams;
do {
if (av_stristart(is->filename, "data:", NULL) && orig_nb_streams > 0) {
for (i = 0; i < orig_nb_streams; i++) {
if (!ic->streams[i] || !ic->streams[i]->codecpar || ic->streams[i]->codecpar->profile == FF_PROFILE_UNKNOWN) {
break;
}
}
if (i == orig_nb_streams) {
break;
}
}
err = avformat_find_stream_info(ic, opts);
} while(0);
ffp_notify_msg1(ffp, FFP_MSG_FIND_STREAM_INFO);
for (i = 0; i < orig_nb_streams; i++)
av_dict_free(&opts[i]);
av_freep(&opts);
if (err < 0) {
av_log(NULL, AV_LOG_WARNING,
"%s: could not find codec parameters/n", is->filename);
ret = -1;
goto fail;
}
}
if (ic->pb)
ic->pb->eof_reached = 0; // FIXME hack, ffplay maybe should not use avio_feof() to test for the end
if (ffp->seek_by_bytes < 0)
ffp->seek_by_bytes = !!(ic->iformat->flags & AVFMT_TS_DISCONT) && strcmp("ogg", ic->iformat->name);
is->max_frame_duration = (ic->iformat->flags & AVFMT_TS_DISCONT) ? 10.0 : 3600.0;
is->max_frame_duration = 10.0;
av_log(ffp, AV_LOG_INFO, "max_frame_duration: %.3f/n", is->max_frame_duration);
#ifdef FFP_MERGE
if (!window_title && (t = av_dict_get(ic->metadata, "title", NULL, 0)))
window_title = av_asprintf("%s - %s", t->value, input_filename);
#endif
/* if seeking requested, we execute it */
if (ffp->start_time != AV_NOPTS_VALUE) {
int64_t timestamp;
timestamp = ffp->start_time;
/* add the stream start time */
if (ic->start_time != AV_NOPTS_VALUE)
timestamp += ic->start_time;
ret = avformat_seek_file(ic, -1, INT64_MIN, timestamp, INT64_MAX, 0);
if (ret < 0) {
av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f/n",
is->filename, (double)timestamp / AV_TIME_BASE);
}
}
is->realtime = is_realtime(ic);
av_dump_format(ic, 0, is->filename, 0);
int video_stream_count = 0;
int h264_stream_count = 0;
int first_h264_stream = -1;
for (i = 0; i < ic->nb_streams; i++) {
AVStream *st = ic->streams[i];
enum AVMediaType type = st->codecpar->codec_type;
st->discard = AVDISCARD_ALL;
if (type >= 0 && ffp->wanted_stream_spec[type] && st_index[type] == -1)
if (avformat_match_stream_specifier(ic, st, ffp->wanted_stream_spec[type]) > 0)
st_index[type] = i;
// choose first h264
if (type == AVMEDIA_TYPE_VIDEO) {
enum AVCodecID codec_id = st->codecpar->codec_id;
video_stream_count++;
if (codec_id == AV_CODEC_ID_H264) {
h264_stream_count++;
if (first_h264_stream < 0)
first_h264_stream = i;
}
}
}
if (video_stream_count > 1 && st_index[AVMEDIA_TYPE_VIDEO] < 0) {
st_index[AVMEDIA_TYPE_VIDEO] = first_h264_stream;
av_log(NULL, AV_LOG_WARNING, "multiple video stream found, prefer first h264 stream: %d/n", first_h264_stream);
}
if (!ffp->video_disable)
st_index[AVMEDIA_TYPE_VIDEO] =
av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO,
st_index[AVMEDIA_TYPE_VIDEO], -1, NULL, 0);
if (!ffp->audio_disable)
st_index[AVMEDIA_TYPE_AUDIO] =
av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO,
st_index[AVMEDIA_TYPE_AUDIO],
st_index[AVMEDIA_TYPE_VIDEO],
NULL, 0);
if (!ffp->video_disable && !ffp->subtitle_disable)
st_index[AVMEDIA_TYPE_SUBTITLE] =
av_find_best_stream(ic, AVMEDIA_TYPE_SUBTITLE,
st_index[AVMEDIA_TYPE_SUBTITLE],
(st_index[AVMEDIA_TYPE_AUDIO] >= 0 ?
st_index[AVMEDIA_TYPE_AUDIO] :
st_index[AVMEDIA_TYPE_VIDEO]),
NULL, 0);
is->show_mode = ffp->show_mode;
#ifdef FFP_MERGE // bbc: dunno if we need this
if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {
AVStream *st = ic->streams[st_index[AVMEDIA_TYPE_VIDEO]];
AVCodecParameters *codecpar = st->codecpar;
AVRational sar = av_guess_sample_aspect_ratio(ic, st, NULL);
if (codecpar->width)
set_default_window_size(codecpar->width, codecpar->height, sar);
}
#endif
/* open the streams */
if (st_index[AVMEDIA_TYPE_AUDIO] >= 0) {
stream_component_open(ffp, st_index[AVMEDIA_TYPE_AUDIO]);
} else {
ffp->av_sync_type = AV_SYNC_VIDEO_MASTER;
is->av_sync_type = ffp->av_sync_type;
}
ret = -1;
if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {
ret = stream_component_open(ffp, st_index[AVMEDIA_TYPE_VIDEO]);
}
if (is->show_mode == SHOW_MODE_NONE)
is->show_mode = ret >= 0 ? SHOW_MODE_VIDEO : SHOW_MODE_RDFT;
if (st_index[AVMEDIA_TYPE_SUBTITLE] >= 0) {
stream_component_open(ffp, st_index[AVMEDIA_TYPE_SUBTITLE]);
}
ffp_notify_msg1(ffp, FFP_MSG_COMPONENT_OPEN);
if (!ffp->ijkmeta_delay_init) {
ijkmeta_set_avformat_context_l(ffp->meta, ic);
}
ffp->stat.bit_rate = ic->bit_rate;
if (st_index[AVMEDIA_TYPE_VIDEO] >= 0)
ijkmeta_set_int64_l(ffp->meta, IJKM_KEY_VIDEO_STREAM, st_index[AVMEDIA_TYPE_VIDEO]);
if (st_index[AVMEDIA_TYPE_AUDIO] >= 0)
ijkmeta_set_int64_l(ffp->meta, IJKM_KEY_AUDIO_STREAM, st_index[AVMEDIA_TYPE_AUDIO]);
if (st_index[AVMEDIA_TYPE_SUBTITLE] >= 0)
ijkmeta_set_int64_l(ffp->meta, IJKM_KEY_TIMEDTEXT_STREAM, st_index[AVMEDIA_TYPE_SUBTITLE]);
if (is->video_stream < 0 && is->audio_stream < 0) {
av_log(NULL, AV_LOG_FATAL, "Failed to open file '%s' or configure filtergraph/n",
is->filename);
ret = -1;
goto fail;
}
if (is->audio_stream >= 0) {
is->audioq.is_buffer_indicator = 1;
is->buffer_indicator_queue = &is->audioq;
} else if (is->video_stream >= 0) {
is->videoq.is_buffer_indicator = 1;
is->buffer_indicator_queue = &is->videoq;
} else {
assert("invalid streams");
}
if (ffp->infinite_buffer < 0 && is->realtime)
ffp->infinite_buffer = 1;
if (!ffp->render_wait_start && !ffp->start_on_prepared)
toggle_pause(ffp, 1);
if (is->video_st && is->video_st->codecpar) {
AVCodecParameters *codecpar = is->video_st->codecpar;
ffp_notify_msg3(ffp, FFP_MSG_VIDEO_SIZE_CHANGED, codecpar->width, codecpar->height);
ffp_notify_msg3(ffp, FFP_MSG_SAR_CHANGED, codecpar->sample_aspect_ratio.num, codecpar->sample_aspect_ratio.den);
}
ffp->prepared = true;
ffp_notify_msg1(ffp, FFP_MSG_PREPARED);
if (!ffp->render_wait_start && !ffp->start_on_prepared) {
while (is->pause_req && !is->abort_request) {
SDL_Delay(20);
}
}
if (ffp->auto_resume) {
ffp_notify_msg1(ffp, FFP_REQ_START);
ffp->auto_resume = 0;
}
/* offset should be seeked*/
if (ffp->seek_at_start > 0) {
ffp_seek_to_l(ffp, (long)(ffp->seek_at_start));
}
for (;;) {
if (is->abort_request)
break;
#ifdef FFP_MERGE
if (is->paused != is->last_paused) {
is->last_paused = is->paused;
if (is->paused)
is->read_pause_return = av_read_pause(ic);
else
av_read_play(ic);
}
#endif
#if CONFIG_RTSP_DEMUXER || CONFIG_MMSH_PROTOCOL
if (is->paused &&
(!strcmp(ic->iformat->name, "rtsp") ||
(ic->pb && !strncmp(ffp->input_filename, "mmsh:", 5)))) {
/* wait 10 ms to avoid trying to get another packet */
/* XXX: horrible */
SDL_Delay(10);
continue;
}
#endif
if (is->seek_req) {
int64_t seek_target = is->seek_pos;
int64_t seek_min = is->seek_rel > 0 ? seek_target - is->seek_rel + 2: INT64_MIN;
int64_t seek_max = is->seek_rel < 0 ? seek_target - is->seek_rel - 2: INT64_MAX;
// FIXME the +-2 is due to rounding being not done in the correct direction in generation
// of the seek_pos/seek_rel variables
ffp_toggle_buffering(ffp, 1);
ffp_notify_msg3(ffp, FFP_MSG_BUFFERING_UPDATE, 0, 0);
ret = avformat_seek_file(is->ic, -1, seek_min, seek_target, seek_max, is->seek_flags);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR,
"%s: error while seeking/n", is->ic->filename);
} else {
if (is->audio_stream >= 0) {
packet_queue_flush(&is->audioq);
packet_queue_put(&is->audioq, &flush_pkt);
// TODO: clear invaild audio data
// SDL_AoutFlushAudio(ffp->aout);
}
if (is->subtitle_stream >= 0) {
packet_queue_flush(&is->subtitleq);
packet_queue_put(&is->subtitleq, &flush_pkt);
}
if (is->video_stream >= 0) {
if (ffp->node_vdec) {
ffpipenode_flush(ffp->node_vdec);
}
packet_queue_flush(&is->videoq);
packet_queue_put(&is->videoq, &flush_pkt);
}
if (is->seek_flags & AVSEEK_FLAG_BYTE) {
set_clock(&is->extclk, NAN, 0);
} else {
set_clock(&is->extclk, seek_target / (double)AV_TIME_BASE, 0);
}
is->latest_video_seek_load_serial = is->videoq.serial;
is->latest_audio_seek_load_serial = is->audioq.serial;
is->latest_seek_load_start_at = av_gettime();
}
ffp->dcc.current_high_water_mark_in_ms = ffp->dcc.first_high_water_mark_in_ms;
is->seek_req = 0;
is->queue_attachments_req = 1;
is->eof = 0;
#ifdef FFP_MERGE
if (is->paused)
step_to_next_frame(is);
#endif
completed = 0;
SDL_LockMutex(ffp->is->play_mutex);
if (ffp->auto_resume) {
is->pause_req = 0;
if (ffp->packet_buffering)
is->buffering_on = 1;
ffp->auto_resume = 0;
stream_update_pause_l(ffp);
}
if (is->pause_req)
step_to_next_frame_l(ffp);
SDL_UnlockMutex(ffp->is->play_mutex);
if (ffp->enable_accurate_seek) {
is->drop_aframe_count = 0;
is->drop_vframe_count = 0;
SDL_LockMutex(is->accurate_seek_mutex);
if (is->video_stream >= 0) {
is->video_accurate_seek_req = 1;
}
if (is->audio_stream >= 0) {
is->audio_accurate_seek_req = 1;
}
SDL_CondSignal(is->audio_accurate_seek_cond);
SDL_CondSignal(is->video_accurate_seek_cond);
SDL_UnlockMutex(is->accurate_seek_mutex);
}
ffp_notify_msg3(ffp, FFP_MSG_SEEK_COMPLETE, (int)fftime_to_milliseconds(seek_target), ret);
ffp_toggle_buffering(ffp, 1);
}
if (is->queue_attachments_req) {
if (is->video_st && (is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC)) {
AVPacket copy = { 0 };
if ((ret = av_packet_ref(©, &is->video_st->attached_pic)) < 0)
goto fail;
packet_queue_put(&is->videoq, ©);
packet_queue_put_nullpacket(&is->videoq, is->video_stream);
}
is->queue_attachments_req = 0;
}
/* if the queue are full, no need to read more */
if (ffp->infinite_buffer<1 && !is->seek_req &&
#ifdef FFP_MERGE
(is->audioq.size + is->videoq.size + is->subtitleq.size > MAX_QUEUE_SIZE
#else
(is->audioq.size + is->videoq.size + is->subtitleq.size > ffp->dcc.max_buffer_size
#endif
|| ( stream_has_enough_packets(is->audio_st, is->audio_stream, &is->audioq, MIN_FRAMES)
&& stream_has_enough_packets(is->video_st, is->video_stream, &is->videoq, MIN_FRAMES)
&& stream_has_enough_packets(is->subtitle_st, is->subtitle_stream, &is->subtitleq, MIN_FRAMES)))) {
if (!is->eof) {
ffp_toggle_buffering(ffp, 0);
}
/* wait 10 ms */
SDL_LockMutex(wait_mutex);
SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);
SDL_UnlockMutex(wait_mutex);
continue;
}
if ((!is->paused || completed) &&
(!is->audio_st || (is->auddec.finished == is->audioq.serial && frame_queue_nb_remaining(&is->sampq) == 0)) &&
(!is->video_st || (is->viddec.finished == is->videoq.serial && frame_queue_nb_remaining(&is->pictq) == 0))) {
if (ffp->loop != 1 && (!ffp->loop || --ffp->loop)) {
stream_seek(is, ffp->start_time != AV_NOPTS_VALUE ? ffp->start_time : 0, 0, 0);
} else if (ffp->autoexit) {
ret = AVERROR_EOF;
goto fail;
} else {
ffp_statistic_l(ffp);
if (completed) {
av_log(ffp, AV_LOG_INFO, "ffp_toggle_buffering: eof/n");
SDL_LockMutex(wait_mutex);
// infinite wait may block shutdown
while(!is->abort_request && !is->seek_req)
SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 100);
SDL_UnlockMutex(wait_mutex);
if (!is->abort_request)
continue;
} else {
completed = 1;
ffp->auto_resume = 0;
// TODO: 0 it's a bit early to notify complete here
ffp_toggle_buffering(ffp, 0);
toggle_pause(ffp, 1);
if (ffp->error) {
av_log(ffp, AV_LOG_INFO, "ffp_toggle_buffering: error: %d/n", ffp->error);
ffp_notify_msg1(ffp, FFP_MSG_ERROR);
} else {
av_log(ffp, AV_LOG_INFO, "ffp_toggle_buffering: completed: OK/n");
ffp_notify_msg1(ffp, FFP_MSG_COMPLETED);
}
}
}
}
pkt->flags = 0;
ret = av_read_frame(ic, pkt);
if (ret < 0) {
int pb_eof = 0;
int pb_error = 0;
if ((ret == AVERROR_EOF || avio_feof(ic->pb)) && !is->eof) {
ffp_check_buffering_l(ffp);
pb_eof = 1;
// check error later
}
if (ic->pb && ic->pb->error) {
pb_eof = 1;
pb_error = ic->pb->error;
}
if (ret == AVERROR_EXIT) {
pb_eof = 1;
pb_error = AVERROR_EXIT;
}
if (pb_eof) {
if (is->video_stream >= 0)
packet_queue_put_nullpacket(&is->videoq, is->video_stream);
if (is->audio_stream >= 0)
packet_queue_put_nullpacket(&is->audioq, is->audio_stream);
if (is->subtitle_stream >= 0)
packet_queue_put_nullpacket(&is->subtitleq, is->subtitle_stream);
is->eof = 1;
}
if (pb_error) {
if (is->video_stream >= 0)
packet_queue_put_nullpacket(&is->videoq, is->video_stream);
if (is->audio_stream >= 0)
packet_queue_put_nullpacket(&is->audioq, is->audio_stream);
if (is->subtitle_stream >= 0)
packet_queue_put_nullpacket(&is->subtitleq, is->subtitle_stream);
is->eof = 1;
ffp->error = pb_error;
av_log(ffp, AV_LOG_ERROR, "av_read_frame error: %s/n", ffp_get_error_string(ffp->error));
// break;
} else {
ffp->error = 0;
}
if (is->eof) {
ffp_toggle_buffering(ffp, 0);
SDL_Delay(100);
}
SDL_LockMutex(wait_mutex);
SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);
SDL_UnlockMutex(wait_mutex);
ffp_statistic_l(ffp);
continue;
} else {
is->eof = 0;
}
if (pkt->flags & AV_PKT_FLAG_DISCONTINUITY) {
if (is->audio_stream >= 0) {
packet_queue_put(&is->audioq, &flush_pkt);
}
if (is->subtitle_stream >= 0) {
packet_queue_put(&is->subtitleq, &flush_pkt);
}
if (is->video_stream >= 0) {
packet_queue_put(&is->videoq, &flush_pkt);
}
}
/* check if packet is in play range specified by user, then queue, otherwise discard */
stream_start_time = ic->streams[pkt->stream_index]->start_time;
pkt_ts = pkt->pts == AV_NOPTS_VALUE ? pkt->dts : pkt->pts;
pkt_in_play_range = ffp->duration == AV_NOPTS_VALUE ||
(pkt_ts - (stream_start_time != AV_NOPTS_VALUE ? stream_start_time : 0)) *
av_q2d(ic->streams[pkt->stream_index]->time_base) -
(double)(ffp->start_time != AV_NOPTS_VALUE ? ffp->start_time : 0) / 1000000
<= ((double)ffp->duration / 1000000);
if (pkt->stream_index == is->audio_stream && pkt_in_play_range) {
packet_queue_put(&is->audioq, pkt);
} else if (pkt->stream_index == is->video_stream && pkt_in_play_range
&& !(is->video_st && (is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC))) {
packet_queue_put(&is->videoq, pkt);
} else if (pkt->stream_index == is->subtitle_stream && pkt_in_play_range) {
packet_queue_put(&is->subtitleq, pkt);
} else {
av_packet_unref(pkt);
}
ffp_statistic_l(ffp);
if (ffp->ijkmeta_delay_init && !init_ijkmeta &&
(ffp->first_video_frame_rendered || !is->video_st) && (ffp->first_audio_frame_rendered || !is->audio_st)) {
ijkmeta_set_avformat_context_l(ffp->meta, ic);
init_ijkmeta = 1;
}
if (ffp->packet_buffering) {
io_tick_counter = SDL_GetTickHR();
if ((!ffp->first_video_frame_rendered && is->video_st) || (!ffp->first_audio_frame_rendered && is->audio_st)) {
if (abs((int)(io_tick_counter - prev_io_tick_counter)) > FAST_BUFFERING_CHECK_PER_MILLISECONDS) {
prev_io_tick_counter = io_tick_counter;
ffp->dcc.current_high_water_mark_in_ms = ffp->dcc.first_high_water_mark_in_ms;
ffp_check_buffering_l(ffp);
}
} else {
if (abs((int)(io_tick_counter - prev_io_tick_counter)) > BUFFERING_CHECK_PER_MILLISECONDS) {
prev_io_tick_counter = io_tick_counter;
ffp_check_buffering_l(ffp);
}
}
}
}
ret = 0;
fail:
if (ic && !is->ic)
avformat_close_input(&ic);
if (!ffp->prepared || !is->abort_request) {
ffp->last_error = last_error;
ffp_notify_msg2(ffp, FFP_MSG_ERROR, last_error);
}
SDL_DestroyMutex(wait_mutex);
return 0;
}
-
通过
avformat_alloc_context()方法来初始化 AVFormatContext -
调用
avformat_open_input()方法完成文件的打开和格式的探测 -
通过
ffp_notify_msg1()发送FFP_MSG_OPEN_INPUT消息 -
通过
avformat_find_stream_info()来读媒体文件的 packet -
通过
ffp_notify_msg1()发送FFP_MSG_FIND_STREAM_INFO消息 -
如果是 seek，调用
avformat_seek_file() -
通过
stream_component_open()来打开解码器avcodec_alloc_context3() avcodec_parameters_to_context() avcodec_find_decoder avcodec_open2() decoder_start()
-
通过
ffp_notify_msg1()发送FFP_MSG_COMPONENT_OPEN消息 -
ffp->prepared = true -
通过
ffp_notify_msg1()发送FFP_MSG_PREPARED消息 -
进入
for(;;)循环，不断av_read_frame()
FFP_MSG_PREPARED
消息走到 message_loop_n
中：
static void message_loop_n(JNIEnv *env, IjkMediaPlayer *mp)
{
jobject weak_thiz = (jobject) ijkmp_get_weak_thiz(mp);
JNI_CHECK_GOTO(weak_thiz, env, NULL, "mpjni: message_loop_n: null weak_thiz", LABEL_RETURN);
while (1) {
AVMessage msg;
int retval = ijkmp_get_msg(mp, &msg, 1);
if (retval < 0)
break;
// block-get should never return 0
assert(retval > 0);
switch (msg.what) {
case FFP_MSG_PREPARED:
MPTRACE("FFP_MSG_PREPARED:/n");
post_event(env, weak_thiz, MEDIA_PREPARED, 0, 0);
break;
default:
ALOGE("unknown FFP_MSG_xxx(%d)/n", msg.what);
break;
}
msg_free_res(&msg);
}
LABEL_RETURN:
;
}
在 ijkmp_get_msg()
方法中通过 ijkmp_change_state_l
将状态改为 MP_STATE_PREPARED
/* need to call msg_free_res for freeing the resouce obtained in msg */
int ijkmp_get_msg(IjkMediaPlayer *mp, AVMessage *msg, int block)
{
assert(mp);
while (1) {
int continue_wait_next_msg = 0;
int retval = msg_queue_get(&mp->ffplayer->msg_queue, msg, block);
if (retval <= 0)
return retval;
switch (msg->what) {
case FFP_MSG_PREPARED:
MPTRACE("ijkmp_get_msg: FFP_MSG_PREPARED/n");
pthread_mutex_lock(&mp->mutex);
if (mp->mp_state == MP_STATE_ASYNC_PREPARING) {
ijkmp_change_state_l(mp, MP_STATE_PREPARED);
} else {
// FIXME: 1: onError() ?
av_log(mp->ffplayer, AV_LOG_DEBUG, "FFP_MSG_PREPARED: expecting mp_state==MP_STATE_ASYNC_PREPARING/n");
}
if (!mp->ffplayer->start_on_prepared) {
ijkmp_change_state_l(mp, MP_STATE_PAUSED);
}
pthread_mutex_unlock(&mp->mutex);
break;
}
if (continue_wait_next_msg) {
msg_free_res(msg);
continue;
}
return retval;
}
return -1;
}
同时通过 post_event()
将消息传递给 java 层
inline static void post_event(JNIEnv *env, jobject weak_this, int what, int arg1, int arg2)
{
// MPTRACE("post_event(%p, %p, %d, %d, %d)", (void*)env, (void*) weak_this, what, arg1, arg2);
J4AC_IjkMediaPlayer__postEventFromNative(env, weak_this, what, arg1, arg2, NULL);
// MPTRACE("post_event()=void");
}
对应到 java 层：
public final class IjkMediaPlayer extends AbstractMediaPlayer {
/*
* Called from native code when an interesting event happens. This method
* just uses the EventHandler system to post the event back to the main app
* thread. We use a weak reference to the original IjkMediaPlayer object so
* that the native code is safe from the object disappearing from underneath
* it. (This is the cookie passed to native_setup().)
*/
@CalledByNative
private static void postEventFromNative(Object weakThiz, int what,
int arg1, int arg2, Object obj) {
if (weakThiz == null)
return;
@SuppressWarnings("rawtypes")
IjkMediaPlayer mp = (IjkMediaPlayer) ((WeakReference) weakThiz).get();
if (mp == null) {
return;
}
if (what == MEDIA_INFO && arg1 == MEDIA_INFO_STARTED_AS_NEXT) {
// this acquires the wakelock if needed, and sets the client side
// state
mp.start();
}
if (mp.mEventHandler != null) {
Message m = mp.mEventHandler.obtainMessage(what, arg1, arg2, obj);
mp.mEventHandler.sendMessage(m);
}
}
private static class EventHandler extends Handler {
private final WeakReference<IjkMediaPlayer> mWeakPlayer;
public EventHandler(IjkMediaPlayer mp, Looper looper) {
super(looper);
mWeakPlayer = new WeakReference<IjkMediaPlayer>(mp);
}
@Override
public void handleMessage(Message msg) {
IjkMediaPlayer player = mWeakPlayer.get();
if (player == null || player.mNativeMediaPlayer == 0) {
DebugLog.w(TAG,
"IjkMediaPlayer went away with unhandled events");
return;
}
switch (msg.what) {
case MEDIA_PREPARED:
player.notifyOnPrepared();
return;
case MEDIA_PLAYBACK_COMPLETE:
player.stayAwake(false);
player.notifyOnCompletion();
return;
case MEDIA_BUFFERING_UPDATE:
long bufferPosition = msg.arg1;
if (bufferPosition < 0) {
bufferPosition = 0;
}
long percent = 0;
long duration = player.getDuration();
if (duration > 0) {
percent = bufferPosition * 100 / duration;
}
if (percent >= 100) {
percent = 100;
}
// DebugLog.efmt(TAG, "Buffer (%d%%) %d/%d", percent, bufferPosition, duration);
player.notifyOnBufferingUpdate((int)percent);
return;
case MEDIA_SEEK_COMPLETE:
player.notifyOnSeekComplete();
return;
case MEDIA_SET_VIDEO_SIZE:
player.mVideoWidth = msg.arg1;
player.mVideoHeight = msg.arg2;
player.notifyOnVideoSizeChanged(player.mVideoWidth, player.mVideoHeight,
player.mVideoSarNum, player.mVideoSarDen);
return;
case MEDIA_ERROR:
DebugLog.e(TAG, "Error (" + msg.arg1 + "," + msg.arg2 + ")");
if (!player.notifyOnError(msg.arg1, msg.arg2)) {
player.notifyOnCompletion();
}
player.stayAwake(false);
return;
case MEDIA_INFO:
switch (msg.arg1) {
case MEDIA_INFO_VIDEO_RENDERING_START:
DebugLog.i(TAG, "Info: MEDIA_INFO_VIDEO_RENDERING_START/n");
break;
}
player.notifyOnInfo(msg.arg1, msg.arg2);
// No real default action so far.
return;
case MEDIA_TIMED_TEXT:
if (msg.obj == null) {
player.notifyOnTimedText(null);
} else {
IjkTimedText text = new IjkTimedText(new Rect(0, 0, 1, 1), (String)msg.obj);
player.notifyOnTimedText(text);
}
return;
case MEDIA_NOP: // interface test message - ignore
break;
case MEDIA_SET_VIDEO_SAR:
player.mVideoSarNum = msg.arg1;
player.mVideoSarDen = msg.arg2;
player.notifyOnVideoSizeChanged(player.mVideoWidth, player.mVideoHeight,
player.mVideoSarNum, player.mVideoSarDen);
break;
default:
DebugLog.e(TAG, "Unknown message type " + msg.what);
}
}
}
}
最终通过 player.notifyOnPrepared()
回调出去
正文到此结束
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