http://blog.csdn.net/jwzhangjie/article/details/9111547

Android本地视频播放器开发--视频解码

分类： android多媒体开发视频播放器制作SDL 2013-06-17 13:49 946人阅读 评论(2) 收藏 举报 android视频播放器开发

在上一章Android本地视频播放器开发--SDL编译编译中编译出sdl的支持库，当时我们使用的2.0，但是有些api被更改了，所以在以下的使用者中我们使用SDL1.3的库，这个库我会传上源码以及编译出的库，接下来这张我们使用ffmpeg解码视频文件中的视频帧同时使用SDL去显示。

1、Decodec_Video.c 这是我视频解码的文件，其中内容如下:

[cpp] view plain copy print ?
  1. #include <stdio.h>
  2. #include <android/log.h>
  4. #ifdef __MINGW32__
  5. #undef main /* Prevents SDL from overriding main() */
  6. #endif
  8. #include "../SDL/include/SDL.h"
  9. #include "../SDL/include/SDL_thread.h"
  11. #include "VideoPlayerDecode.h"
  12. #include "../ffmpeg/libavutil/avutil.h"
  13. #include "../ffmpeg/libavcodec/avcodec.h"
  14. #include "../ffmpeg/libavformat/avformat.h"
  15. #include "../ffmpeg/libswscale/swscale.h"
  17. AVFormatContext *pFormatCtx;
  18. int i, videoStream;
  19. AVCodecContext *pCodecCtx;
  20. AVCodec *pCodec;
  21. AVFrame *pFrame;
  22. AVPacket packet;
  23. int frameFinished;
  24. float aspect_ratio;
  26. static struct SwsContext *img_convert_ctx;
  27. SDL_Surface *screen;
  28. SDL_Overlay *bmp;
  29. SDL_Rect rect;
  30. SDL_Event event;
  33. JNIEXPORT jint JNICALL Java_com_zhangjie_graduation_videopalyer_jni_VideoPlayerDecode_VideoPlayer
  34. (JNIEnv *env, jclass clz, jstring fileName)
  35. {
  36. const char* local_title = (*env)->GetStringUTFChars(env, fileName, NULL);
  37. av_register_all();//注册所有支持的文件格式以及编解码器
  38. if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
  39. fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
  40. exit(1);
  41. }
  42. if(avformat_open_input(&pFormatCtx, local_title, NULL, NULL) != 0)
  43. return -1;
  44. if(avformat_find_stream_info(pFormatCtx, NULL) < 0)
  45. return -1;
  46. av_dump_format(pFormatCtx, -1, local_title, 0);
  47. videoStream=-1;
  48. for(i=0; i<pFormatCtx->nb_streams; i++)
  49. if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
  50. videoStream=i;
  51. break;
  52. }
  53. if(videoStream==-1)
  54. return -1; // Didn't find a video stream
  55. // Get a pointer to the codec context for the video stream
  56. pCodecCtx=pFormatCtx->streams[videoStream]->codec;
  58. // Find the decoder for the video stream
  59. pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  60. if(pCodec==NULL) {
  61. fprintf(stderr, "Unsupported codec!\n");
  62. return -1; // Codec not found
  63. }
  64. if(avcodec_open2(pCodecCtx, pCodec, NULL) < 0)return -1;
  65. pFrame = avcodec_alloc_frame();
  66. if(pFrame == NULL)return -1;
  67. // Make a screen to put our video
  68. #ifndef __DARWIN__
  69. screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 0, 0);
  70. #else
  71. screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 24, 0);
  72. #endif
  73. if(!screen) {
  74. fprintf(stderr, "SDL: could not set video mode - exiting\n");
  75. exit(1);
  76. }
  77. // Allocate a place to put our YUV image on that screen
  78. bmp = SDL_CreateYUVOverlay(pCodecCtx->width,
  79. pCodecCtx->height,
  80. SDL_YV12_OVERLAY,
  81. screen);
  82. img_convert_ctx = sws_getContext(pCodecCtx->width,
  83. pCodecCtx->height, pCodecCtx->pix_fmt,
  84. pCodecCtx->width, pCodecCtx->height,
  85. PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL);
  87. // Read frames and save first five frames to disk
  88. i=0;
  89. while(av_read_frame(pFormatCtx, &packet)>=0) {
  90. // Is this a packet from the video stream?
  91. if(packet.stream_index==videoStream) {
  92. avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  93. // Did we get a video frame?
  94. if(frameFinished) {
  95. SDL_LockYUVOverlay(bmp);
  97. AVPicture *pict;
  98. pict->data[0] = bmp->pixels[0];
  99. pict->data[1] = bmp->pixels[2];
  100. pict->data[2] = bmp->pixels[1];
  102. pict->linesize[0] = bmp->pitches[0];
  103. pict->linesize[1] = bmp->pitches[2];
  104. pict->linesize[2] = bmp->pitches[1];
  106. sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pict->data, pict->linesize);
  107. SDL_UnlockYUVOverlay(bmp);
  109. rect.x = 0;
  110. rect.y = 0;
  111. rect.w = pCodecCtx->width;
  112. rect.h = pCodecCtx->height;
  113. SDL_DisplayYUVOverlay(bmp, &rect);
  115. }
  116. }
  117. // Free the packet that was allocated by av_read_frame
  118. av_free_packet(&packet);
  119. SDL_PollEvent(&event);
  120. switch(event.type) {
  121. case SDL_QUIT:
  122. SDL_Quit();
  123. exit(0);
  124. break;
  125. default:
  126. break;
  127. }
  129. }
  130. // Free the YUV frame
  131. av_free(pFrame);
  133. // Close the codec
  134. avcodec_close(pCodecCtx);
  136. // Close the video file
  137. av_close_input_file(pFormatCtx);
  138. }

2、编译结果如下:

[cpp] view plain copy print ?
  1. root@zhangjie:/Graduation/jni# ndk-build
  2. Install : libSDL.so => libs/armeabi/libSDL.so
  3. Install : libffmpeg-neon.so => libs/armeabi/libffmpeg-neon.so
  4. Compile arm : ffmpeg-test-neon <= Decodec_Video.c
  5. /Graduation/jni/jniffmpeg/Decodec_Video.c: In function 'Java_com_zhangjie_graduation_videopalyer_jni_VideoPlayerDecode_VideoPlayer':
  6. /Graduation/jni/jniffmpeg/Decodec_Video.c:106:1: warning: passing argument 2 of 'sws_scale' from incompatible pointer type [enabled by default]
  7. /Graduation/jni/jniffmpeg/../ffmpeg/libswscale/swscale.h:237:5: note: expected 'uint8_t const * const*' but argument is of type 'uint8_t **'
  8. /Graduation/jni/jniffmpeg/Decodec_Video.c:137:2: warning: 'av_close_input_file' is deprecated (declared at /Graduation/jni/jniffmpeg/../ffmpeg/libavformat/avformat.h:1533) [-Wdeprecated-declarations]
  9. SharedLibrary : libffmpeg-test-neon.so
  10. Install : libffmpeg-test-neon.so => libs/armeabi/libffmpeg-test-neon.so
3、SDL1.3源码

http://download.csdn.net/detail/jwzhangjie/5596453

4、之前在Android本地视频播放器开发--NDK编译FFmpeg中没有添加swscale功能，所以需要重新编译ffmpeg，其脚本如下:

[plain] view plain copy print ?
  1. NDK=/opt/android-ndk-r8d
  2. PLATFORM=$NDK/platforms/android-8/arch-arm/
  3. PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  4. LOCAL_ARM_NEON=true
  5. CPU=armv7-a
  6. OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -mcpu=cortex-a8"
  7. PREFIX=./android/$CPU
  8. ./configure --target-os=linux \
  9. --prefix=$PREFIX \
  10. --enable-cross-compile \
  11. --arch=arm \
  12. --enable-nonfree \
  13. --enable-asm \
  14. --cpu=cortex-a8 \
  15. --enable-neon \
  16. --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  17. --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  18. --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  19. --sysroot=$PLATFORM \
  20. --extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 $OPTIMIZE_CFLAGS " \
  21. --disable-shared \
  22. --enable-static \
  23. --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  24. --disable-ffmpeg \
  25. --disable-ffplay \
  26. --disable-ffprobe \
  27. --disable-ffserver \
  28. --disable-encoders \
  29. --enable-avformat \
  30. --disable-optimizations \
  31. --disable-doc \
  32. --enable-pthreads \
  33. --disable-yasm \
  34. --enable-zlib \
  35. --enable-pic \
  36. --enable-small
  38. #make clean
  39. make -j4 install
  41. $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
  43. $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -soname libffmpeg-neon.so -shared -nostdlib -z noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg-neon.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libavfilter/libavfilter.a libswresample/libswresample.a libswscale/libswscale.a libavdevice/libavdevice.a -lc -lm -lz -ldl -llog --warn-once --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a

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