适用于Android的简单FFMpeg播放器 [英] Simple FFMpeg player for Android
本文介绍了适用于Android的简单FFMpeg播放器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在将AVFrame(AVPicture)输出到ANativeWindow时遇到问题.我写了simpe测试代码:
I have a problem with the output of AVFrame (AVPicture) into the ANativeWindow. I wrote simpe test code:
void *Player::readThread(void * reserved) {
ALOGD("Read thread started!");
VideoState *state = (VideoState *) reserved;
int err = 0;
int ret;
int i;
AVFormatContext *formatContext = NULL;
AVCodecContext *codecContext = NULL;
AVCodecParameters *codecParams = NULL;
AVCodecID codecID = AV_CODEC_ID_NONE;
AVCodec *decoder = NULL;
AVFrame *frame = NULL;
AVFrame *frameRGBA = NULL;
AVPacket packet;
struct SwsContext *img2RGBAContext;
ANativeWindow_Buffer windowBuffer;
uint8_t *RGBABuffer = NULL;
int RGBABufferSize = 0;
int got = 0;
int windowWidth = 640;
int windowHeight = 480;
const char *url = state->url.c_str();
if (url == NULL || strlen(url) <= 0) {
err = ERROR_UNKNOWN_URI;
goto exit;
}
ALOGD("URL to play: %s", url);
state->isPlaying = true;
formatContext = avformat_alloc_context();
if (formatContext == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("formatContext allocated");
frame = av_frame_alloc();
if (frame == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("frame allocated");
frameRGBA = av_frame_alloc();
if (frameRGBA == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("frameRGBA allocated");
ret = avformat_open_input(&formatContext, url, NULL, NULL);
if (ret != 0) {
err = ERROR_CAN_NOT_OPEN_URI;
goto exit;
}
ALOGD("formatContext opened");
ret = avformat_find_stream_info(formatContext, NULL);
if (ret != 0) {
err = ERROR_CAN_NOT_FIND_STREAM_INFO;
goto exit;
}
ALOGD("file info found");
for (i = 0; i < formatContext->nb_streams; i++) {
AVStream *stream = formatContext->streams[i];
AVCodecParameters *codecParams = stream->codecpar;
AVCodecID codecID = codecParams->codec_id;
AVMediaType type = codecParams->codec_type;
const char *codecName = avcodec_get_name(codecID);
switch (type) {
case AVMEDIA_TYPE_AUDIO:
ALOGD("Stream [%d]: type=AUDIO codecName=%s",i,codecName);
break;
case AVMEDIA_TYPE_VIDEO:
ALOGD("Stream [%d]: type=VIDEO codecName=%s",i,codecName);
if (state->video_stream == -1) {
state->video_stream = i;
}
break;
case AVMEDIA_TYPE_SUBTITLE:
ALOGD("Stream [%d]: type=SUBTITLE codecName=%s",i,codecName);
break;
default:
ALOGD("Stream [%d]: type=UNKNOWN codecName=%s",i,codecName);
break;
}
}
if (state->video_stream == -1) {
err = ERROR_CAN_NOT_FIND_ANY_STREAM;
goto exit;
}
ALOGD("Video stream index: %d",state->video_stream);
codecParams = formatContext->streams[state->video_stream]->codecpar;
codecID = codecParams->codec_id;
if (codecID == AV_CODEC_ID_NONE) {
err = ERROR_UNKNOWN_CODEC;
goto exit;
}
ALOGD("Codec found");
decoder = avcodec_find_decoder(codecID);
if (decoder == NULL) {
err = ERROR_CAN_NOT_FIND_DECODER;
goto exit;
}
ALOGD("Decoder found");
codecContext = avcodec_alloc_context3(decoder);
if (codecContext == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("codecContext created");
ret = avcodec_parameters_to_context(codecContext, codecParams);
if (ret < 0) {
err = ERROR_CAN_NOT_START_DECODER;
goto exit;
}
ALOGD("codecContext params was set");
ret = avcodec_open2(codecContext, decoder, NULL);
if (ret != 0) {
err = ERROR_CAN_NOT_START_DECODER;
goto exit;
}
ALOGD("Decoder opened");
if (state->window != NULL) {
ANativeWindow_setBuffersGeometry(state->window, codecParams->width, codecParams->height, WINDOW_FORMAT_RGB_565);
ALOGD("Window geometry changed");
}
if (codecParams->width>0 && codecParams->height>0) {
ALOGD("Video width: %d\nVideo height: %d",codecParams->width, codecParams->height);
img2RGBAContext = sws_getCachedContext(
NULL,
codecParams->width,
codecParams->height,
(AVPixelFormat)codecParams->format,
codecParams->width,
codecParams->height,
AV_PIX_FMT_RGB565,
SWS_BICUBIC,
NULL,
NULL,
NULL);
if (img2RGBAContext == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
} else {
err = ERROR_CAN_NOT_START_DECODER;
goto exit;
}
ALOGD("img2RGBAContext created");
RGBABufferSize = av_image_get_buffer_size(AV_PIX_FMT_RGB565, codecParams->width, codecParams->height, 1);
RGBABuffer = (uint8_t *)malloc(RGBABufferSize*sizeof(uint8_t));
if (RGBABuffer == NULL) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
ALOGD("frameRGBABuffer size %d bytes",RGBABufferSize);
ret = av_image_alloc(frameRGBA->data, frameRGBA->linesize, codecParams->width, codecParams->height, AV_PIX_FMT_RGB565, 1);
if (ret < 0) {
err = ERROR_OUT_OF_MEMORY;
goto exit;
}
while (av_read_frame(formatContext, &packet) >= 0 && state->isPlaying) {
if (packet.stream_index != state->video_stream) {
ALOGD("Packet is not a video packet. Discard.");
av_packet_unref(&packet);
continue;
}
ret = avcodec_send_packet(codecContext, &packet);
if (ret != 0) {
ALOGE("Can not send packet to decode");
av_packet_unref(&packet);
continue;
}
ret = avcodec_receive_frame(codecContext, frame);
if (ret != 0) {
ALOGE("Can not receive decoded frame yet");
av_packet_unref(&packet);
continue;
}
ALOGD("Converting image to RGB565...");
sws_scale(img2RGBAContext, frame->data, frame->linesize, 0, codecParams->height, frameRGBA->data, frameRGBA->linesize);
ALOGD("Image converted to RGB565");
av_image_copy_to_buffer(RGBABuffer,
RGBABufferSize,
frameRGBA->data,
frameRGBA->linesize,
AV_PIX_FMT_RGB565,
codecParams->width,
codecParams->height,
1);
ALOGD("Image wrote into frameRGBABuffer");
if (ANativeWindow_lock(state->window, &windowBuffer, NULL) == 0) {
ALOGD("Writing %d bytes to windowBuffer", RGBABufferSize);
memcpy(windowBuffer.bits, RGBABuffer, RGBABufferSize);
ANativeWindow_unlockAndPost(state->window);
ALOGD("Image displayed");
} else {
ALOGE("Can not display frame");
}
av_packet_unref(&packet);
}
exit:
ALOGD("Releasing resources...");
if (err!=0) {
state->isPlaying = false;
#if !LOG_NDEBUG
switch (err) {
case ERROR_OUT_OF_MEMORY:
ALOGE("Out of memory!");
break;
case ERROR_CAN_NOT_OPEN_URI:
ALOGE("Can not open URI: %s", url);
break;
case ERROR_UNKNOWN_URI:
ALOGE("Unknown URI to open!");
break;
default:
ALOGE("Unknown error");
break;
}
#endif
// TODO: send error to listener
}
sws_freeContext(img2RGBAContext);
free(RGBABuffer);
av_free(frame);
av_freep(&frameRGBA->data[0]);
av_packet_unref(&packet);
avcodec_close(codecContext);
avformat_close_input(&formatContext);
avformat_free_context(formatContext);
ALOGD("Read thread closed!");
}
我在一些视频中遇到了下一个问题:例如，此视频为我提供了下一条日志:
I faced with the next problem in some videos: For example, this video gives me next logs:
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: Read thread started!
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: URL to play: http://www.ex.ua/load/280797285
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: formatContext allocated
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: frame allocated
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: frameRGBA allocated
10-23 14:53:42.846 26970-4527/com.don.ffmpegplayer D/Player: formatContext opened
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: file info found
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: Stream [0]: type=VIDEO codecName=h264
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: Stream [1]: type=AUDIO codecName=ac3
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [2]: type=AUDIO codecName=ac3
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [3]: type=AUDIO codecName=ac3
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [4]: type=SUBTITLE codecName=subrip
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Video stream index: 0
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Codec found
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Decoder found
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: codecContext created
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: codecContext params was set
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Decoder opened
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Window geometry changed
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Video width: 1024
Video height: 424
10-23 14:53:42.882 26970-4527/com.don.ffmpegplayer D/Player: img2RGBAContext created
10-23 14:53:42.882 26970-4527/com.don.ffmpegplayer D/Player: frameRGBABuffer size 868352 bytes
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer E/Player: Can not receive decoded frame yet
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
10-23 14:53:42.899 26970-4527/com.don.ffmpegplayer E/Player: Can not receive decoded frame yet
10-23 14:53:42.905 26970-4527/com.don.ffmpegplayer D/Player: Converting image to RGB565...
10-23 14:53:42.918 26970-4527/com.don.ffmpegplayer D/Player: Image converted to RGB565
10-23 14:53:42.919 26970-4527/com.don.ffmpegplayer D/Player: Image wrote into frameRGBABuffer
10-23 14:53:42.920 26970-4527/com.don.ffmpegplayer D/Player: Writing 868352 bytes to windowBuffer
10-23 14:53:42.921 26970-4527/com.don.ffmpegplayer D/Player: Image displayed
10-23 14:53:42.926 26970-4527/com.don.ffmpegplayer D/Player: Converting image to RGB565...
10-23 14:53:42.934 26970-4527/com.don.ffmpegplayer D/Player: Image converted to RGB565
10-23 14:53:42.935 26970-4527/com.don.ffmpegplayer D/Player: Image wrote into frameRGBABuffer
10-23 14:53:42.936 26970-4527/com.don.ffmpegplayer D/Player: Writing 868352 bytes to windowBuffer
10-23 14:53:42.937 26970-4527/com.don.ffmpegplayer D/Player: Image displayed
我做错了什么?如果我理解正确，则需要执行以下步骤:
What am I doing wrong? If I understood correctly, I need to follow next steps:
- 从解码器获取解码的AVFrame
- 将AVFrame数据转换为RGB565或RGB8888
- 从转换后的帧中获取像素数据
- 将其写入本机窗口
但是在这段代码中，有两点使我感到困惑: ANative_setBuffersGeometry 是否正确调用?为什么 frameRGBABuffer 的大小为868352字节?如果视频大小为1024 * 424，则 frameRGBABuffer 大小必须为 width * height * 4 ，不是吗?如果我将第一个图像显示后，将 frameRGBABuffer 的大小更改为 width * height * 4 ，程序会自动重现.我将视频尺寸传递给 ANative_setBuffersGeometry .
But in this code two points confuse me: is ANative_setBuffersGeometry called correctly and why frameRGBABuffer size is 868352 bytes? If video size is 1024*424 frameRGBABuffer size must be width*height*4, isn't it? If I change frameRGBABuffer size to width*height*4 program carashes after first image diplayed. I pass video dimmensions to ANative_setBuffersGeometry.
对于任何帮助，谢谢.
推荐答案
问题出在视频宽度和我传递给 ANativeWindow_setBuffersGeometry 的值中.我不知道为什么，但是 ANativeWindow_setBuffersGeometry 只能将 640、1280、1920 作为宽度参数，高度-任何需要的句柄进行校正.如果我设置了其他宽度-如屏幕截图所示出现问题.
The problem was in width of video and value that I pass into ANativeWindow_setBuffersGeometry. I do not know why, but ANativeWindow_setBuffersGeometry can correct handle only 640, 1280, 1920 as a width parameter, height - any wanted. If I set any other width - problem apperars as on screenshot.
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