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本篇內(nèi)容主要講解“FFmpeg怎么利用ffplay實(shí)現(xiàn)自定義輸入流播放”,感興趣的朋友不妨來(lái)看看。本文介紹的方法操作簡(jiǎn)單快捷,實(shí)用性強(qiáng)。下面就讓小編來(lái)帶大家學(xué)習(xí)“FFmpeg怎么利用ffplay實(shí)現(xiàn)自定義輸入流播放”吧!
avio是ffmpeg自定義輸入流的對(duì)象,它是AVformatContext的一個(gè)字段,我只需要?jiǎng)?chuàng)建avio對(duì)象并實(shí)現(xiàn)其回調(diào)方法,然后給AVformatContext.pb賦值即可。
以文件流為例(省略了打開(kāi)文件和獲取文件長(zhǎng)度的操作)
FILE* file; static int avio_read(ACPlay play, uint8_t* buf, int bufsize) { return fread(buf, 1, bufsize, file); } static int64_t avio_seek(ACPlay play, int64_t offset, int whence) { switch (whence) { case AVSEEK_SIZE: return fileSize; break; case SEEK_CUR: fseek(file, offset, whence); break; case SEEK_SET: fseek(file, offset, whence); break; case SEEK_END: fseek(file, offset, whence); break; default: break; } return ftell(test3file); }
AVFormatContext* ic = NULL; AVIOContext* avio = avio_alloc_context((unsigned char*)av_malloc(1024 * 1024), 1024 * 1024, 0, s, avio_read, NULL, avio_seek); if (avio) { ic->pb = avio; ic->flags = AVFMT_FLAG_CUSTOM_IO; } avformat_open_input(&ic, "", NULL, NULL);
if (ic->avio) { if (ic->avio->buffer) { av_free(is->avio->buffer); } avio_context_free(&is->avio); ic->avio = NULL; }
在VideoState中添加如下字段
AVIOContext* avio;
/// <summary> /// 開(kāi)始播放 /// </summary> /// <param name="play">播放器對(duì)象</param> /// <param name="read">自定義輸入流,讀取數(shù)據(jù)時(shí)的回調(diào)</param> /// <param name="seek">自定義輸入流,定位時(shí)的回調(diào)</param> void ac_play_startViaCustomStream(ACPlay play, ACPlayCustomPacketReadCallback read, ACPlayCustomPacketStreamSeekCallback seek); { VideoState* s = (VideoState*)play; if(read) s->avio = avio_alloc_context((unsigned char*)av_malloc(1024 * 1024), 1024 * 1024, 0, s, read, NULL, seek); stream_open(s, "", NULL); }
在read_thread中avformat_open_input的上一行添加如下代碼:
if (is->avio) { ic->pb = is->avio; ic->flags = AVFMT_FLAG_CUSTOM_IO; }
在stream_close中添加如下代碼
if (ic->avio) { if (ic->avio->buffer) { av_free(is->avio->buffer); } avio_context_free(&is->avio); ic->avio = NULL; }
到此,相信大家對(duì)“FFmpeg怎么利用ffplay實(shí)現(xiàn)自定義輸入流播放”有了更深的了解,不妨來(lái)實(shí)際操作一番吧!這里是億速云網(wǎng)站,更多相關(guān)內(nèi)容可以進(jìn)入相關(guān)頻道進(jìn)行查詢,關(guān)注我們,繼續(xù)學(xué)習(xí)!
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