1、寫在前面 ??

此文章主要包含解碼H264視頻流數據，主要有以下幾點：

??????? 1、H264視頻幀為Annex B格式，若使用AVCC格式可自行研究；

??????? 2、H264視頻裸流，非解碼視頻文件(若有需要我后期可添加這部分代碼);

??????? 3、支持輸出RGB24或YUV420格式，其他可自行修改；

??????? 4、FFmpeg官網代碼迭代及接口變更較大，代碼適應于FFmpeg3.4.2"Cantor"、3.3.7"Hilbert"等版本，較舊接口請看舊版本代碼；

2、新版本

FFmpegVideoDecoder.h

#include <libavcodec/avcodec.h>/**視頻流解碼器初始化@param ctx 解碼參數結構體AVCodecParameters@see FFmpeg_H264DecoderInit，此為解碼H264視頻流@return 初始化成功返回0，否則<0*/ int FFmpeg_VideoDecoderInit(AVCodecParameters *ctx);/**H264視頻流解碼器初始化@return 初始化成功返回0，否則<0*/ int FFmpeg_H264DecoderInit(void);/**釋放解碼器@return 初始化成功返回0，否則<0*/ int FFmpeg_VideoDecoderRelease(void);//return 0:暫未收到解碼數據，-1：解碼失敗，1：解碼成功/**解碼視頻流數據@param inbuf 視頻裸流數據@param inbufSize 視頻裸流數據大小@param framePara 接收幀參數數組：{width,height,linesize1,linesiz2,linesize3}@param outRGBBuf 輸出RGB數據(若已申請內存)@param outYUVBuf 輸出YUV數據(若已申請內存)@return 成功返回解碼數據幀大小，否則<=0*/ int FFmpeg_H264Decode(unsigned char * inbuf, int inbufSize, int *framePara, unsigned char *outRGBBuf, unsigned char **outYUVBuf);

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FFmpegVideoDecoder.c

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#include <libavformat/avformat.h> #include <libswscale/swscale.h> #include "FFmpegVideoDecoder.h"struct AVCodecContext *pAVCodecCtx_decoder = NULL; struct AVCodec *pAVCodec_decoder; struct AVPacket mAVPacket_decoder; struct AVFrame *pAVFrame_decoder = NULL; struct SwsContext* pImageConvertCtx_decoder = NULL; struct AVFrame *pFrameYUV_decoder = NULL;int FFmpeg_VideoDecoderInit(AVCodecParameters *codecParameters) {if (!codecParameters) {CPrintf("Source codec context is NULL."); //CPrintf需替換為printfreturn -1;}FFmpeg_VideoDecoderRelease();avcodec_register_all();pAVCodec_decoder = avcodec_find_decoder(codecParameters->codec_id);if (!pAVCodec_decoder) {CPrintf1("Can not find codec:%d\n", codecParameters->codec_id);return -2;}pAVCodecCtx_decoder = avcodec_alloc_context3(pAVCodec_decoder);if (!pAVCodecCtx_decoder) {CPrintf("Failed to alloc codec context.");FFmpeg_VideoDecoderRelease();return -3;}if (avcodec_parameters_to_context(pAVCodecCtx_decoder, codecParameters) < 0) {CPrintf("Failed to copy avcodec parameters to codec context.");FFmpeg_VideoDecoderRelease();return -3;}if (avcodec_open2(pAVCodecCtx_decoder, pAVCodec_decoder, NULL) < 0){CPrintf("Failed to open h264 decoder");FFmpeg_VideoDecoderRelease();return -4;}av_init_packet(&mAVPacket_decoder);pAVFrame_decoder = av_frame_alloc();pFrameYUV_decoder = av_frame_alloc();return 0; }int FFmpeg_H264DecoderInit() {avcodec_register_all();AVCodec *pAVCodec = avcodec_find_decoder(AV_CODEC_ID_H264);if (!pAVCodec){CPrintf("can not find H264 codec\n");return -1;}AVCodecContext *pAVCodecCtx = avcodec_alloc_context3(pAVCodec);if (pAVCodecCtx == NULL) {CPrintf("Could not alloc video context!\n");return -2;}AVCodecParameters *codecParameters = avcodec_parameters_alloc();if (avcodec_parameters_from_context(codecParameters, pAVCodecCtx) < 0) {CPrintf("Failed to copy avcodec parameters from codec context.");avcodec_parameters_free(&codecParameters);avcodec_free_context(&pAVCodecCtx);return -3;}int ret = FFmpeg_VideoDecoderInit(codecParameters);avcodec_parameters_free(&codecParameters);avcodec_free_context(&pAVCodecCtx);return ret; }int FFmpeg_VideoDecoderRelease() {if (pAVCodecCtx_decoder != NULL) {avcodec_free_context(&pAVCodecCtx_decoder);pAVCodecCtx_decoder = NULL;}if (pAVFrame_decoder != NULL) {av_packet_unref(&mAVPacket_decoder);av_free(pAVFrame_decoder);pAVFrame_decoder = NULL;}if (pFrameYUV_decoder) {av_frame_unref(pFrameYUV_decoder);av_free(pFrameYUV_decoder);pFrameYUV_decoder = NULL;}if (pImageConvertCtx_decoder) {sws_freeContext(pImageConvertCtx_decoder);}av_packet_unref(&mAVPacket_decoder);return 0; }int FFmpeg_H264Decode(unsigned char *inbuf, int inbufSize, int *framePara, unsigned char *outRGBBuf, unsigned char **outYUVBuf) {if (!pAVCodecCtx_decoder || !pAVFrame_decoder || !inbuf || inbufSize<=0 || !framePara || (!outRGBBuf && !outYUVBuf)) {return -1;}av_frame_unref(pAVFrame_decoder);av_frame_unref(pFrameYUV_decoder);framePara[0] = framePara[1] = 0;mAVPacket_decoder.data = inbuf;mAVPacket_decoder.size = inbufSize;int ret = avcodec_send_packet(pAVCodecCtx_decoder, &mAVPacket_decoder);if (ret == 0) {ret = avcodec_receive_frame(pAVCodecCtx_decoder, pAVFrame_decoder);if (ret == 0) {framePara[0] = pAVFrame_decoder->width;framePara[1] = pAVFrame_decoder->height;if (outYUVBuf) {*outYUVBuf = (unsigned char *)pAVFrame_decoder->data;framePara[2] = pAVFrame_decoder->linesize[0];framePara[3] = pAVFrame_decoder->linesize[1];framePara[4] = pAVFrame_decoder->linesize[2];} else if (outRGBBuf) {pFrameYUV_decoder->data[0] = outRGBBuf;pFrameYUV_decoder->data[1] = NULL;pFrameYUV_decoder->data[2] = NULL;pFrameYUV_decoder->data[3] = NULL;int linesize[4] = { pAVCodecCtx_decoder->width * 3, pAVCodecCtx_decoder->height * 3, 0, 0 };pImageConvertCtx_decoder = sws_getContext(pAVCodecCtx_decoder->width, pAVCodecCtx_decoder->height, AV_PIX_FMT_YUV420P, pAVCodecCtx_decoder->width, pAVCodecCtx_decoder->height, AV_PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);sws_scale(pImageConvertCtx_decoder, (const uint8_t* const *) pAVFrame_decoder->data, pAVFrame_decoder->linesize, 0, pAVCodecCtx_decoder->height, pFrameYUV_decoder->data, linesize);sws_freeContext(pImageConvertCtx_decoder);return 1;}} else if (ret == AVERROR(EAGAIN)) {return 0;} else {return -1;}}return 0; }

3、舊版本

FFmpegVideoDecoder.h

int FFmpeg_VideoDecoderInit(AVCodecContext *ctx); int FFmpeg_H264DecoderInit(void); int FFmpeg_VideoDecoderRelease(void); int FFmpeg_H264Decode(unsigned char * inbuf, int inbufSize, int *framePara, unsigned char *outRGBBuf, unsigned char **outYUVBuf);

FFmpegVideoDecoder.c

#include <libavformat/avformat.h> #include <libswscale/swscale.h> #include "FFmpegVideoDecoder.h"struct AVCodecContext *pAVCodecCtx = NULL; struct AVCodec *pAVCodec; struct AVPacket mAVPacket; struct AVFrame *pAVFrame = NULL; struct SwsContext* pImageConvertCtx = NULL; struct AVFrame *pFrameYUV = NULL;int FFmpeg_VideoDecoderInit(AVCodecContext *ctx) {if (!ctx) {cv_printf("Source codec context is NULL."); //cv_printf需替換為printfreturn -1;}FFmpeg_VideoDecoderRelease();avcodec_register_all();pAVCodec = avcodec_find_decoder(ctx->codec_id);if (!pAVCodec) {cv_printf("Can not find codec:%d\n", ctx->codec_id);return -2;}pAVCodecCtx = avcodec_alloc_context3(pAVCodec);if (!pAVCodecCtx || avcodec_copy_context(pAVCodecCtx, ctx) != 0) {cv_printf("Failed to alloc codec context.");FFmpeg_VideoDecoderRelease();return -3;}if (avcodec_open2(pAVCodecCtx, pAVCodec, NULL) < 0){cv_printf("Failed to open h264 decoder");FFmpeg_VideoDecoderRelease();return -4;}av_init_packet(&mAVPacket);pAVFrame = av_frame_alloc();pFrameYUV = av_frame_alloc();return 0; }int FFmpeg_H264DecoderInit() {avcodec_register_all();AVCodec *pAVCodec = avcodec_find_decoder(AV_CODEC_ID_H264);if (!pAVCodec){cv_printf("can not find H264 codec\n");return -1;}AVCodecContext *pAVCodecCtx = avcodec_alloc_context3(pAVCodec);int ret = FFmpeg_VideoDecoderInit(pAVCodecCtx);if (pAVCodecCtx || ret < 0) {avcodec_free_context(&pAVCodecCtx);pAVCodecCtx = NULL;}return ret; }int FFmpeg_VideoDecoderRelease() {if (pAVCodecCtx != NULL) {avcodec_close(pAVCodecCtx);avcodec_free_context(&pAVCodecCtx);pAVCodecCtx = NULL;}if (pAVFrame != NULL) {av_packet_unref(&mAVPacket);av_free(pAVFrame);pAVFrame = NULL;}if (pFrameYUV) {av_frame_unref(pFrameYUV);av_free(pFrameYUV);pFrameYUV = NULL;}if (pImageConvertCtx) {sws_freeContext(pImageConvertCtx);}av_packet_unref(&mAVPacket);return 0; }int FFmpeg_H264Decode(unsigned char * inbuf, int inbufSize, int *framePara, unsigned char *outRGBBuf, unsigned char **outYUVBuf) {av_frame_unref(pAVFrame);av_frame_unref(pFrameYUV);framePara[0] = framePara[1] = 0;mAVPacket.data = inbuf;mAVPacket.size = inbufSize;if (inbuf==NULL || inbufSize<=0) {return -1;}int len = -1, got_picture = 0;len = avcodec_decode_video2(pAVCodecCtx, pAVFrame, &got_picture, &mAVPacket);if (len < 0) {cv_printf("解碼錯誤:%d\n",len);return len;}if (got_picture > 0) {framePara[0] = pAVFrame->width;framePara[1] = pAVFrame->height;if (outYUVBuf) {*outYUVBuf = (unsigned char *)pAVFrame->data;framePara[2] = pAVFrame->linesize[0];framePara[3] = pAVFrame->linesize[1];framePara[4] = pAVFrame->linesize[2];} else if (outRGBBuf) {pFrameYUV->data[0] = outRGBBuf;pFrameYUV->data[1] = NULL;pFrameYUV->data[2] = NULL;pFrameYUV->data[3] = NULL;int linesize[4] = { pAVCodecCtx->width * 3, pAVCodecCtx->height * 3, 0, 0 };pImageConvertCtx = sws_getContext(pAVCodecCtx->width, pAVCodecCtx->height, AV_PIX_FMT_YUV420P, pAVCodecCtx->width, pAVCodecCtx->height, AV_PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);sws_scale(pImageConvertCtx, (const uint8_t* const *) pAVFrame->data, pAVFrame->linesize, 0, pAVCodecCtx->height, pFrameYUV->data, linesize);sws_freeContext(pImageConvertCtx);}}return len; }

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