业界良心OpenAI开源的Whisper模型是开源语音转文字领域的执牛耳者，白璧微瑕之处在于无法通过苹果M芯片优化转录效率，Whisper.cpp 则是 Whisper 模型的 C/C++ 移植版本，它具有无依赖项、内存使用量低等特点，重要的是增加了 Core ML 支持，完美适配苹果M系列芯片。

Whisper.cpp的张量运算符针对苹果M芯片的 CPU 进行了大量优化，根据计算大小，使用 Arm Neon SIMD instrisics 或 CBLAS Accelerate 框架例程，后者对于更大的尺寸特别有效，因为 Accelerate 框架可以使用苹果M系列芯片中提供的专用 AMX 协处理器。

配置Whisper.cpp

老规矩，运行git命令来克隆Whisper.cpp项目：

git clone 

随后进入项目的目录：

cd whisper.cpp

项目默认的基础模型不支持中文，这里推荐使用medium模型，通过shell脚本进行下载：

bash ./models/download-ggml-model.sh medium

下载完成后，会在项目的models目录保存ggml-medium.bin模型文件，大小为1.53GB：

whisper.cpp git:(master) cd models ➜  models git:(master) lltotal 3006000-rw-r--r--  1 liuyue  staff   3.2K  4 21 07:21 README.md-rw-r--r--  1 liuyue  staff   7.2K  4 21 07:21 convert-h5-to-ggml.py-rw-r--r--  1 liuyue  staff   9.2K  4 21 07:21 convert-pt-to-ggml.py-rw-r--r--  1 liuyue  staff    13K  4 21 07:21 convert-whisper-to-coreml.pydrwxr-xr-x  4 liuyue  staff   128B  4 22 00:33 coreml-encoder-medium.mlpackage-rwxr-xr-x  1 liuyue  staff   2.1K  4 21 07:21 download-coreml-model.sh-rw-r--r--  1 liuyue  staff   1.3K  4 21 07:21 download-ggml-model.cmd-rwxr-xr-x  1 liuyue  staff   2.0K  4 21 07:21 download-ggml-model.sh-rw-r--r--  1 liuyue  staff   562K  4 21 07:21 for-tests-ggml-base.bin-rw-r--r--  1 liuyue  staff   573K  4 21 07:21 for-tests-ggml-base.en.bin-rw-r--r--  1 liuyue  staff   562K  4 21 07:21 for-tests-ggml-large.bin-rw-r--r--  1 liuyue  staff   562K  4 21 07:21 for-tests-ggml-medium.bin-rw-r--r--  1 liuyue  staff   573K  4 21 07:21 for-tests-ggml-medium.en.bin-rw-r--r--  1 liuyue  staff   562K  4 21 07:21 for-tests-ggml-small.bin-rw-r--r--  1 liuyue  staff   573K  4 21 07:21 for-tests-ggml-small.en.bin-rw-r--r--  1 liuyue  staff   562K  4 21 07:21 for-tests-ggml-tiny.bin-rw-r--r--  1 liuyue  staff   573K  4 21 07:21 for-tests-ggml-tiny.en.bin-rwxr-xr-x  1 liuyue  staff   1.4K  4 21 07:21 generate-coreml-interface.sh-rwxr-xr-x@ 1 liuyue  staff   769B  4 21 07:21 generate-coreml-model.sh-rw-r--r--  1 liuyue  staff   1.4G  3 22 16:04 ggml-medium.bin

模型下载以后，在根目录编译可执行文件：

make

程序返回：

➜  whisper.cpp git:(master) makeI whisper.cpp build info: I UNAME_S:  DarwinI UNAME_P:  armI UNAME_M:  arm64I CFLAGS:   -I.              -O3 -DNDEBUG -std=c11   -fPIC -pthread -DGGML_USE_ACCELERATEI CXXFLAGS: -I. -I./examples -O3 -DNDEBUG -std=c++11 -fPIC -pthreadI LDFLAGS:   -framework AccelerateI CC:       Apple clang version 14.0.3 (clang-1403.0.22.14.1)I CXX:      Apple clang version 14.0.3 (clang-1403.0.22.14.1)c++ -I. -I./examples -O3 -DNDEBUG -std=c++11 -fPIC -pthread examples/bench/bench.cpp ggml.o whisper.o -o bench  -framework Accelerate

至此，Whisper.cpp就配置好了。

牛刀小试

现在我们来测试一段语音，看看效果：

./main -osrt -m ./models/ggml-medium.bin -f samples/jfk.wav

这行命令的含义是通过刚才下载ggml-medium.bin模型来对项目中的samples/jfk.wav语音文件进行识别，这段语音是遇刺的美国总统肯尼迪的著名演讲，程序返回：

➜  whisper.cpp git:(master) ./main -osrt -m ./models/ggml-medium.bin -f samples/jfk.wavwhisper_init_from_file_no_state: loading model from './models/ggml-medium.bin'whisper_model_load: loading modelwhisper_model_load: n_vocab       = 51865whisper_model_load: n_audio_ctx   = 1500whisper_model_load: n_audio_state = 1024whisper_model_load: n_audio_head  = 16whisper_model_load: n_audio_layer = 24whisper_model_load: n_text_ctx    = 448whisper_model_load: n_text_state  = 1024whisper_model_load: n_text_head   = 16whisper_model_load: n_text_layer  = 24whisper_model_load: n_mels        = 80whisper_model_load: f16           = 1whisper_model_load: type          = 4whisper_model_load: mem required  = 1725.00 MB (+   43.00 MB per decoder)whisper_model_load: adding 1608 extra tokenswhisper_model_load: model ctx     = 1462.35 MBwhisper_model_load: model size    = 1462.12 MBwhisper_init_state: kv self size  =   42.00 MBwhisper_init_state: kv cross size =  140.62 MBsystem_info: n_threads = 4 / 10 | AVX = 0 | AVX2 = 0 | AVX512 = 0 | FMA = 0 | NEON = 1 | ARM_FMA = 1 | F16C = 0 | FP16_VA = 1 | WASM_SIMD = 0 | BLAS = 1 | SSE3 = 0 | VSX = 0 | COREML = 0 | main: processing 'samples/jfk.wav' (176000 samples, 11.0 sec), 4 threads, 1 processors, lang = en, task = transcribe, timestamps = 1 ...[00:00:00.000 --> 00:00:11.000]   And so, my fellow Americans, ask not what your country can do for you, ask what you can do for your country.output_srt: saving output to 'samples/jfk.wav.srt'

只需要11秒，同时语音字幕会写入samples/jfk.wav.srt文件。

英文准确率是百分之百。

现在我们来换成中文语音，可以随便录制一段语音，需要注意的是，Whisper.cpp只支持wav格式的语音文件，这里先通过ffmpeg将mp3文件转换为wav:

ffmpeg -i ./test1.mp3 -ar 16000 -ac 1 -c:a pcm_s16le ./test1.wav

程序返回：

ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers  built with Apple clang version 14.0.0 (clang-1400.0.29.202)  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.2_1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon  libavutil      57. 28.100 / 57. 28.100  libavcodec     59. 37.100 / 59. 37.100  libavformat    59. 27.100 / 59. 27.100  libavdevice    59.  7.100 / 59.  7.100  libavfilter     8. 44.100 /  8. 44.100  libswscale      6.  7.100 /  6.  7.100  libswresample   4.  7.100 /  4.  7.100  libpostproc    56.  6.100 / 56.  6.100[mp3 @ 0x130e05580] Estimating duration from bitrate, this may be inaccurateInput #0, mp3, from './test1.mp3':  Duration: 00:05:41.33, start: 0.000000, bitrate: 48 kb/s  Stream #0:0: Audio: mp3, 24000 Hz, mono, fltp, 48 kb/sStream mapping:  Stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))Press [q] to stop, [?] for helpOutput #0, wav, to './test1.wav':  Metadata:    ISFT            : Lavf59.27.100  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, mono, s16, 256 kb/s    Metadata:      encoder         : Lavc59.37.100 pcm_s16le[mp3float @ 0x132004260] overread, skip -6 enddists: -4 -4ed=N/A        Last message repeated 1 times[mp3float @ 0x132004260] overread, skip -7 enddists: -1 -1[mp3float @ 0x132004260] overread, skip -7 enddists: -2 -2[mp3float @ 0x132004260] overread, skip -7 enddists: -1 -1[mp3float @ 0x132004260] overread, skip -9 enddists: -2 -2[mp3float @ 0x132004260] overread, skip -5 enddists: -1 -1    Last message repeated 1 times[mp3float @ 0x132004260] overread, skip -7 enddists: -3 -3[mp3float @ 0x132004260] overread, skip -8 enddists: -5 -5[mp3float @ 0x132004260] overread, skip -5 enddists: -2 -2[mp3float @ 0x132004260] overread, skip -6 enddists: -1 -1[mp3float @ 0x132004260] overread, skip -7 enddists: -3 -3[mp3float @ 0x132004260] overread, skip -6 enddists: -2 -2[mp3float @ 0x132004260] overread, skip -6 enddists: -3 -3[mp3float @ 0x132004260] overread, skip -7 enddists: -6 -6[mp3float @ 0x132004260] overread, skip -9 enddists: -6 -6[mp3float @ 0x132004260] overread, skip -5 enddists: -3 -3[mp3float @ 0x132004260] overread, skip -5 enddists: -2 -2[mp3float @ 0x132004260] overread, skip -5 enddists: -3 -3[mp3float @ 0x132004260] overread, skip -7 enddists: -1 -1size=   10667kB time=00:05:41.32 bitrate= 256.0kbits/s speed=2.08e+03x    video:0kB audio:10666kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000714%

这里将一段五分四十一秒的语音转换为wav文件。

随后运行命令开始转录：

./main -osrt -m ./models/ggml-medium.bin -f samples/test1.wav -l zh

这里需要加上参数-l，告知程序为中文语音，程序返回：

➜  whisper.cpp git:(master) ./main -osrt -m ./models/ggml-medium.bin -f samples/test1.wav -l zhwhisper_init_from_file_no_state: loading model from './models/ggml-medium.bin'whisper_model_load: loading modelwhisper_model_load: n_vocab       = 51865whisper_model_load: n_audio_ctx   = 1500whisper_model_load: n_audio_state = 1024whisper_model_load: n_audio_head  = 16whisper_model_load: n_audio_layer = 24whisper_model_load: n_text_ctx    = 448whisper_model_load: n_text_state  = 1024whisper_model_load: n_text_head   = 16whisper_model_load: n_text_layer  = 24whisper_model_load: n_mels        = 80whisper_model_load: f16           = 1whisper_model_load: type          = 4whisper_model_load: mem required  = 1725.00 MB (+   43.00 MB per decoder)whisper_model_load: adding 1608 extra tokenswhisper_model_load: model ctx     = 1462.35 MBwhisper_model_load: model size    = 1462.12 MBwhisper_init_state: kv self size  =   42.00 MBwhisper_init_state: kv cross size =  140.62 MBsystem_info: n_threads = 4 / 10 | AVX = 0 | AVX2 = 0 | AVX512 = 0 | FMA = 0 | NEON = 1 | ARM_FMA = 1 | F16C = 0 | FP16_VA = 1 | WASM_SIMD = 0 | BLAS = 1 | SSE3 = 0 | VSX = 0 | COREML = 0 | main: processing 'samples/test1.wav' (5461248 samples, 341.3 sec), 4 threads, 1 processors, lang = zh, task = transcribe, timestamps = 1 ...[00:00:00.000 --> 00:00:03.340]  Hello 大家好,这里是刘越的技术博客。[00:00:03.340 --> 00:00:05.720]  最近的事情大家都晓得了,[00:00:05.720 --> 00:00:07.880]  某公司技术经理魅上欺下,[00:00:07.880 --> 00:00:10.380]  打工人应对进队,不易快灾,[00:00:10.380 --> 00:00:12.020]  不易壮灾,[00:00:12.020 --> 00:00:14.280]  所谓魅上者必欺下,[00:00:14.280 --> 00:00:16.020]  古人诚不我窃。[00:00:16.020 --> 00:00:17.360]  技术经理者,[00:00:17.360 --> 00:00:20.160]  公然在聊天群里大玩职场PUA,[00:00:20.160 --> 00:00:22.400]  气焰嚣张,有恃无恐,[00:00:22.400 --> 00:00:23.700]  最终引发众目,[00:00:23.700 --> 00:00:26.500]  嘿嘿,技术经理,团队领导,[00:00:26.500 --> 00:00:29.300]  原来团队领导这四个字是这么用的,[00:00:29.300 --> 00:00:31.540]  奴媚显达,构陷下属,[00:00:31.540 --> 00:00:32.780]  人文巨损,[00:00:32.780 --> 00:00:33.840]  逢迎上意,[00:00:33.840 --> 00:00:34.980]  傲然下欺,[00:00:34.980 --> 00:00:36.080]  装腔作势,[00:00:36.080 --> 00:00:37.180]  极尽投机,[00:00:37.180 --> 00:00:38.320]  负他人之负,[00:00:38.320 --> 00:00:39.620]  康他人之愷,[00:00:39.620 --> 00:00:42.180]  如此者,可谓团队领导也。[00:00:42.180 --> 00:00:43.980]  中国的所谓传统文化,[00:00:43.980 --> 00:00:45.320]  除了仁义理智性,[00:00:45.320 --> 00:00:46.620]  除了金石子极,[00:00:46.620 --> 00:00:47.820]  除了争争风骨,[00:00:47.820 --> 00:00:49.560]  其实还有很多别的东西,[00:00:49.560 --> 00:00:52.020]  被大家或有意或无意的忽视了,[00:00:52.020 --> 00:00:53.300]  比如功利实用,[00:00:53.300 --> 00:00:54.300]  屈颜附示,[00:00:54.300 --> 00:00:55.360]  以兼至善,[00:00:55.360 --> 00:01:01.000]  官本位和钱规则的传统,在某种程度上,传统文化这没硬币的另一面,[00:01:01.000 --> 00:01:03.900]  才是更需要我们去面对和正视的,[00:01:03.900 --> 00:01:07.140]  我以为,这在目前盛行实惠价值观的时候,[00:01:07.140 --> 00:01:08.940]  提一提还是必要的,[00:01:08.940 --> 00:01:10.240]  有的人说了,[00:01:10.240 --> 00:01:13.740]  在开发群里对领导,非常痛快,非常爽,[00:01:13.740 --> 00:01:17.180]  但是,然后呢,有用吗?[00:01:17.180 --> 00:01:19.260]  倒霉的还不是自己,[00:01:19.260 --> 00:01:22.520]  没错,这就是功利且实用的传统,[00:01:22.520 --> 00:01:28.780]  各种精神,思辨,反抗,愤怒,都抵不过三个字,有用吗?[00:01:28.780 --> 00:01:31.820]  事实上,但凡叫做某种精神的,[00:01:31.820 --> 00:01:33.320]  那就是哲学思辨,[00:01:33.320 --> 00:01:36.220]  就是一种相对无用的思辨和学术,[00:01:36.220 --> 00:01:39.180]  而中国职场有很强的实用传统,[00:01:39.180 --> 00:01:42.140]  但这不是学术思辨,也没有理论构架,[00:01:42.140 --> 00:01:44.380]  仅仅是一种短视的经验论,[00:01:44.380 --> 00:01:47.220]  所以,功利主义,是密尔,[00:01:47.220 --> 00:01:48.980]  编庆的伦理价值学说,[00:01:48.980 --> 00:01:52.700]  强调的是,追求幸福,如何获得最大效用,[00:01:52.700 --> 00:01:55.580]  实用主义,是西方的一个学术流派,[00:01:55.580 --> 00:01:58.260]  比如杜威,胡适,就是代表,[00:01:58.260 --> 00:02:01.180]  实用主义的另一个名字,叫人本主义,[00:02:01.180 --> 00:02:04.780]  意思是,以人作为经验和万物的尺度,[00:02:04.780 --> 00:02:06.080]  换句话说,[00:02:06.080 --> 00:02:09.420]  功利主义,反对的正是那种短视的功利,[00:02:09.420 --> 00:02:13.220]  实用主义,反对的也正是那种凡是看对自己,[00:02:13.220 --> 00:02:15.220]  是不是有利的局限判断,[00:02:15.220 --> 00:02:17.260]  而在中国职场功利,[00:02:17.260 --> 00:02:21.060]  实用的传统中,恰恰是不会有这些理论构架的,[00:02:21.060 --> 00:02:23.700]  并且,不仅没有理论构架,[00:02:23.700 --> 00:02:26.140]  还要对那些无用的,思辨的,[00:02:26.140 --> 00:02:29.980]  纯粹的精神,视如避喜,吃之以鼻,[00:02:29.980 --> 00:02:32.260]  没错,在技术团队里,[00:02:32.260 --> 00:02:35.260]  我们重视技术,重视实用的科学,[00:02:35.260 --> 00:02:38.900]  但是主流职场并不鼓励去搞那些看似无用的东西,[00:02:38.900 --> 00:02:41.380]  比如普通劳动者的合法权益,[00:02:41.380 --> 00:02:43.580]  张义谋的满江红,[00:02:43.580 --> 00:02:45.220]  大家想必也都看了的,[00:02:45.220 --> 00:02:46.820]  人们总觉得很奇怪,[00:02:46.820 --> 00:02:48.300]  为什么那么坏的人,[00:02:48.300 --> 00:02:50.020]  皇帝为啥不罢免他?[00:02:50.020 --> 00:02:53.140]  为什么小人能当权来构陷好人呢?[00:02:53.140 --> 00:02:55.980]  当我们了解了传统文化中的法家思想,[00:02:55.980 --> 00:02:57.300]  就了然了,[00:02:57.300 --> 00:02:59.260]  在法家的思想规则下,[00:02:59.260 --> 00:03:01.660]  小人得是,忠良备辱,[00:03:01.660 --> 00:03:03.140]  事事所必然,[00:03:03.140 --> 00:03:04.900]  因为他一开始的设定,[00:03:04.900 --> 00:03:07.540]  就使得劣币驱逐良币的游戏规则,[00:03:07.540 --> 00:03:09.940]  所以,在这种观念下,[00:03:09.940 --> 00:03:12.460]  古代常见的一种职场智慧就是,[00:03:12.460 --> 00:03:14.820]  自污名节,以求自保,[00:03:14.820 --> 00:03:16.420]  在这种环境下,[00:03:16.420 --> 00:03:17.780]  要想生存,[00:03:17.780 --> 00:03:19.260]  就只有一条出路,[00:03:19.260 --> 00:03:20.900]  那就是依附权力,[00:03:20.900 --> 00:03:23.700]  并且,谁能拥有更大的权力,[00:03:23.700 --> 00:03:25.700]  谁就能生存得更好,[00:03:25.700 --> 00:03:27.500]  如何依附权力呢?[00:03:27.500 --> 00:03:29.180]  那就是现在正在发生的,[00:03:29.180 --> 00:03:31.900]  肆无忌惮的大腕职场PUA,[00:03:31.900 --> 00:03:33.060]  除此之外,[00:03:33.060 --> 00:03:34.340]  这种权力关系,[00:03:34.340 --> 00:03:36.900]  在古代会渗透到方方面面,[00:03:36.900 --> 00:03:40.300]  因为权力系统是一个复杂而高效的运行机器,[00:03:40.300 --> 00:03:42.940]  CPU,内存,硬盘,[00:03:42.940 --> 00:03:44.900]  甚至一颗C面底螺丝钉,[00:03:44.900 --> 00:03:47.140]  都是权力机器上的一个环节,[00:03:47.140 --> 00:03:48.060]  于是,[00:03:48.060 --> 00:03:50.420]  官僚体系之外的一切职场人,[00:03:50.420 --> 00:03:52.340]  都会面临一个尴尬的处境,[00:03:52.340 --> 00:03:54.340]  一方面遭遇权力的打压,[00:03:54.340 --> 00:03:55.340]  另一方面,[00:03:55.340 --> 00:03:57.900]  也都会多少尝到权力的甜头,[00:03:57.900 --> 00:03:58.900]  于是乎,[00:03:58.900 --> 00:04:01.420]  权力的细胞渗透到角角落落,[00:04:01.420 --> 00:04:02.980]  即便没有组织权力,[00:04:02.980 --> 00:04:04.620]  也要追求文化权力,[00:04:04.620 --> 00:04:05.500]  父权,[00:04:05.500 --> 00:04:06.380]  夫权,[00:04:06.380 --> 00:04:07.460]  家长权力,[00:04:07.460 --> 00:04:08.580]  宗族权力,[00:04:08.580 --> 00:04:09.660]  老师权力,[00:04:09.660 --> 00:04:10.780]  公司权力,[00:04:10.780 --> 00:04:12.140]  团队领导权力,[00:04:12.140 --> 00:04:13.100]  点点滴滴,[00:04:13.100 --> 00:04:15.580]  滴滴点点,追逐权力,[00:04:15.580 --> 00:04:18.140]  几乎成为人们生活的全部意义,[00:04:18.140 --> 00:04:18.980]  故而,[00:04:18.980 --> 00:04:19.980]  服从权力,[00:04:19.980 --> 00:04:21.180]  服从上级,[00:04:21.180 --> 00:04:22.420]  不得罪同事,[00:04:22.420 --> 00:04:23.660]  不得罪朋友,[00:04:23.660 --> 00:04:25.060]  不得罪陌生人,[00:04:25.060 --> 00:04:26.100]  因为你不知道,[00:04:26.100 --> 00:04:28.260]  他们背后有什么的权力关系,[00:04:28.260 --> 00:04:30.940]  他们又会不会用这个权力来对付你,[00:04:30.940 --> 00:04:31.940]  没错,[00:04:31.940 --> 00:04:34.380]  当我们解构群里那位领导的行为时,[00:04:34.380 --> 00:04:36.220]  我们也在解构我们自己,[00:04:36.220 --> 00:04:37.420]  毫无疑问,[00:04:37.420 --> 00:04:39.380]  对于这位敢于发声的职场人,[00:04:39.380 --> 00:04:41.180]  深安职场底层逻辑的,[00:04:41.180 --> 00:04:43.220]  我们一定能猜到他的结局,[00:04:43.220 --> 00:04:44.700]  他的结局是注定的,[00:04:44.700 --> 00:04:46.220]  同时也是悲哀的,[00:04:46.220 --> 00:04:47.340]  问题是,[00:04:47.340 --> 00:04:48.540]  这样做,[00:04:48.540 --> 00:04:49.660]  值得吗?[00:04:49.660 --> 00:04:52.580]  香港著名导演王家卫拍过一部电影,[00:04:52.580 --> 00:04:54.420]  叫做东邪西毒,[00:04:54.420 --> 00:04:56.340]  电影中有这样一个情节,[00:04:56.340 --> 00:04:59.620]  有个女人的弟弟被太尉府的一群刀客杀了,[00:04:59.620 --> 00:05:00.860]  他想报仇,[00:05:00.860 --> 00:05:02.300]  可自己没有武功,[00:05:02.300 --> 00:05:04.060]  只能请刀客出手,[00:05:04.060 --> 00:05:05.540]  但家里穷没钱,[00:05:05.540 --> 00:05:08.540]  最有价值的资产是一篮子鸡蛋,[00:05:08.540 --> 00:05:09.260]  于是,[00:05:09.260 --> 00:05:10.900]  他提着那一篮子鸡蛋,[00:05:10.900 --> 00:05:13.420]  天天站在刀客剑客们经过的路口,[00:05:13.420 --> 00:05:14.700]  请求他们出手,[00:05:14.700 --> 00:05:16.220]  报仇就是鸡蛋,[00:05:16.220 --> 00:05:17.860]  没有人愿意为了鸡蛋,[00:05:17.860 --> 00:05:20.020]  去单挑太尉府的刀客,[00:05:20.020 --> 00:05:21.460]  除了洪七,[00:05:21.460 --> 00:05:24.260]  洪七独自力战太尉府那帮刀客,[00:05:24.260 --> 00:05:26.780]  所得的报仇是一个鸡蛋,[00:05:26.780 --> 00:05:29.020]  但是洪七付出的代价太大,[00:05:29.020 --> 00:05:30.060]  混战中,[00:05:30.060 --> 00:05:32.700]  洪七被对手砍断了一根手指,[00:05:32.700 --> 00:05:33.820]  为了一个鸡蛋,[00:05:33.820 --> 00:05:35.500]  而失去一只手指,[00:05:35.500 --> 00:05:36.740]  值得吗?[00:05:36.740 --> 00:05:37.860]  不值得,[00:05:37.860 --> 00:05:39.300]  但是我觉得痛快,[00:05:39.300 --> 00:05:40.540]  因為這才是我自己output_srt: saving output to 'samples/test1.wav.srt'whisper_print_timings:     load time =   978.82 mswhisper_print_timings:     fallbacks =   0 p /   0 hwhisper_print_timings:      mel time =   438.81 mswhisper_print_timings:   sample time =   980.66 ms /  2343 runs (    0.42 ms per run)whisper_print_timings:   encode time = 31476.10 ms /    13 runs ( 2421.24 ms per run)whisper_print_timings:   decode time = 47833.70 ms /  2343 runs (   20.42 ms per run)whisper_print_timings:    total time = 81797.88 ms

五分钟的语音，只需要一分钟多一点就可以转录完成，效率满分。

当然，精确度还有待提高，提高精确度可以选择large模型，但转录时间会相应增加。

苹果M芯片模型转换

基于苹果Mac系统的用户有福了，Whisper.cpp可以通过Core ML在Apple Neural Engine (ANE)上执行编码器推理，这可以比仅使用CPU执行快出三倍以上。

首先安装转换依赖：

pip install ane_transformerspip install openai-whisperpip install coremltools

接着运行转换脚本：

./models/generate-coreml-model.sh medium    

这里参数即模型的名称。

程序返回：

➜  models git:(master) python3 convert-whisper-to-coreml.py --model medium --encoder-only True scikit-learn version 1.2.0 is not supported. Minimum required version: 0.17. Maximum required version: 1.1.2. Disabling scikit-learn conversion API.ModelDimensions(n_mels=80, n_audio_ctx=1500, n_audio_state=1024, n_audio_head=16, n_audio_layer=24, n_vocab=51865, n_text_ctx=448, n_text_state=1024, n_text_head=16, n_text_layer=24)/opt/homebrew/lib/python3.10/site-packages/whisper/model.py:166: TracerWarning: Converting a tensor to a Python boolean might cause the trace to be incorrect. We can't record the data flow of Python values, so this value will be treated as a constant in the future. This means that the trace might not generalize to other inputs!  assert x.shape[1:] == self.positional_embedding.shape, "incorrect audio shape"/opt/homebrew/lib/python3.10/site-packages/whisper/model.py:97: UserWarning: __floordiv__ is deprecated, and its behavior will change in a future version of pytorch. It currently rounds toward 0 (like the 'trunc' function NOT 'floor'). This results in incorrect rounding for negative values. To keep the current behavior, use torch.div(a, b, rounding_mode='trunc'), or for actual floor division, use torch.div(a, b, rounding_mode='floor').  scale = (n_state // self.n_head) ** -0.25Converting PyTorch Frontend ==> MIL Ops: 100%|▉| 1971/1972 [00:00<00:00, 3247.25Running MIL frontend_pytorch pipeline: 100%|█| 5/5 [00:00<00:00, 54.69 passes/s]Running MIL default pipeline: 100%|████████| 57/57 [00:09<00:00,  6.29 passes/s]Running MIL backend_mlprogram pipeline: 100%|█| 10/10 [00:00<00:00, 444.13 passedone converting

转换好以后，重新进行编译：

make cleanWHISPER_COREML=1 make -j

随后用转换后的模型进行转录即可：

./main -m models/ggml-medium.bin -f samples/jfk.wav

至此，Mac用户立马荣升一等公民。

结语

Whisper.cpp是Whisper的精神复刻与肉体重生，完美承袭了Whisper的所有功能，在此之上，提高了语音转录文字的速度和效率以及跨平台移植性，百尺竿头更进一步，开源技术的高速发展让我们明白了一件事，那就是高品质技术的传播远比技术本身更加宝贵。