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main.cpp
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main.cpp
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/* SPDX-License-Identifier: ISC
* Copyright(c) 2023 junka
*/
#include <string>
#ifndef NATIVE_CLI
#include <emscripten.h>
#include <emscripten/bind.h>
#endif
#include <string>
#ifdef NATIVE_CLI
#include <iostream>
#endif
extern "C" {
#ifdef ENABLE_AVCODEC
#include <libavcodec/avcodec.h>
#endif
#include <libavformat/avformat.h>
#include <libavutil/avutil.h>
}
#ifdef av_fourcc2str
#undef av_fourcc2str
av_always_inline char *av_fourcc2str(unsigned int fourcc) {
char str[AV_FOURCC_MAX_STRING_SIZE];
memset(str, 0, sizeof(str));
return av_fourcc_make_string(str, fourcc);
}
#endif
// using namespace emscripten;
// https://developer.mozilla.org/en-US/docs/Web/Media/Formats/codecs_parameter
/*
audio/mpeg
An audio file using the MPEG file type, such as an MP3.
video/ogg; codecs=vorbis
A video file using the Ogg file type.
video/mp4; codecs="avc1.4d002a"
A video file using the MPEG-4 file type.
video/quicktime
A video file in Apple's QuickTime format. As noted elsewhere, this format was
once commonly used on the web but no longer is, since it required a plugin to
use.
video/webm; codecs="vp8, vorbis"
A WebM file containing VP8 video and/or Vorbis audio.
audio/3gpp
video/3gpp
audio/3gp2
video/3gp2
audio/mp4
application/mp4
---
av01.P.LLT.DD[.M.CCC.cp.tc.mc.F]
cccc[.pp]* (Generic ISO BMFF)
mp4v.oo[.V] (MPEG-4 video)
mp4a.oo[.A] (MPEG-4 audio)
avc1[.PPCCLL] (AVC video)
see samples here
https://cconcolato.github.io/media-mime-support/
https://wiki.whatwg.org/wiki/video_type_parameters#MPEG
*/
// standard of std::format is not supported by emscripten now
static std::string string_format(const char *fmt, ...) {
char *ret;
va_list ap;
va_start(ap, fmt);
vasprintf(&ret, fmt, ap);
va_end(ap);
std::string str(ret);
free(ret);
return str;
}
std::string constraintStr(uint8_t *constrain) {
std::string res;
for (int i = 5; i >= 0; i --) {
if (constrain[i] || res.length() > 0) {
res += string_format("%x", constrain[i]);
}
}
return res;
}
std::string profileCompat(uint8_t *compt) {
uint32_t val = compt[0] << 24 | compt[1] << 16 | compt[2] << 8 | compt[3];
uint32_t ret = 0;
for (int i = 0; i < 32; i ++) {
ret |= val & 0x1;
if (i == 31) {
break;
}
ret <<= 1;
val >>= 1;
}
std::string res = string_format("%x", ret);
return res;
}
std::string getmime(const std::string filename) {
av_log_set_level(AV_LOG_QUIET);
const AVOutputFormat *format = av_guess_format(NULL, filename.c_str(), NULL);
enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
AVFormatContext *fmt_ctx = NULL;
#ifdef ENABLE_AVCODEC
AVCodecContext *avctx = NULL;
#endif
std::string codecs;
std::string mime;
int ret;
if (format && format->mime_type) {
mime += format->mime_type;
if (!strncmp(format->mime_type, "text", 4)) {
return mime;
}
}
ret = avformat_open_input(&fmt_ctx, filename.c_str(), NULL, NULL);
if (ret != 0) {
// std::cout << "fail to open " << filename << AVERROR(ret) << std::endl;
return mime;
}
const AVInputFormat *iformat = fmt_ctx->iformat;
if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {
avformat_close_input(&fmt_ctx);
return mime;
}
#ifdef ENABLE_AVCODEC
avctx = avcodec_alloc_context3(NULL);
if (!avctx) {
avformat_close_input(&fmt_ctx);
return NULL;
}
#endif
// av_dump_format(fmt_ctx, 0, filename, 0);
for (int i = 0; i < (int)fmt_ctx->nb_streams; i++) {
AVStream *s = fmt_ctx->streams[i];
#ifdef ENABLE_AVCODEC
if (avcodec_parameters_to_context(avctx, s->codecpar) < 0) {
avcodec_free_context(&avctx);
avformat_close_input(&fmt_ctx);
return NULL;
}
#endif
if (codecs.length() > 0) {
codecs += ", ";
}
if (AVMEDIA_TYPE_VIDEO == s->codecpar->codec_type) {
type = AVMEDIA_TYPE_VIDEO;
} else if (AVMEDIA_TYPE_AUDIO == s->codecpar->codec_type) {
if (type == AVMEDIA_TYPE_UNKNOWN) {
type = AVMEDIA_TYPE_AUDIO;
}
}
#if 0
char streamCodecsString[256];
avcodec_string(streamCodecsString, sizeof(streamCodecsString), avctx, 0);
std::cout << streamCodecsString << std::endl;
#endif
switch (s->codecpar->codec_id) {
case AV_CODEC_ID_H264:
if (s->codecpar->codec_tag) {
codecs += av_fourcc2str(s->codecpar->codec_tag);
} else {
codecs += "avc1";
}
//see AVCDecoderConfigurationRecord
// ff_h264_decode_extradata(s->codecpar->extradata, s->codecpar->extradata_size,);
if (s->codecpar->extradata_size > 4 &&
s->codecpar->extradata[0] == 1) {
codecs += string_format(".%02x%02x%02x",
s->codecpar->extradata[1], s->codecpar->extradata[2],
s->codecpar->extradata[3]);
} else if (s->codecpar->extradata_size > 12 &&
s->codecpar->extradata[0] == 0 &&
s->codecpar->extradata[1] == 0 &&
s->codecpar->extradata[2] == 0 &&
s->codecpar->extradata[3] == 1) {
//raw SPS
codecs += string_format(
".%02x%02x%02x",
s->codecpar->extradata[10], s->codecpar->extradata[11],
s->codecpar->extradata[12]);
} else {
codecs += string_format(".%02x%02x%02x",
s->codecpar->profile, 0, s->codecpar->level);
}
break;
case AV_CODEC_ID_HEVC:
/*
// HEVCDecoderConfigurationRecord in 14496-15.
unsigned int(8) configurationVersion;
unsigned int(2) general_profile_space;
unsigned int(1) general_tier_flag;
unsigned int(5) general_profile_idc;
unsigned int(32) general_profile_compatibility_flags;
unsigned int(48) general_constraint_indicator_flags;
unsigned int(8) general_level_idc;
bit(4) reserved = ‘1111’b;
unsigned int(12) min_spatial_segmentation_idc;
bit(6) reserved = ‘111111’b;
unsigned int(2) parallelismType;
bit(6) reserved = ‘111111’b;
unsigned int(2) chromaFormat;
bit(5) reserved = ‘11111’b;
unsigned int(3) bitDepthLumaMinus8;
bit(5) reserved = ‘11111’b;
unsigned int(3) bitDepthChromaMinus8;
*/
if (s->codecpar->codec_tag) {
codecs += av_fourcc2str(s->codecpar->codec_tag);
} else {
codecs += "hev1";
}
if (s->codecpar->extradata_size > 22 && s->codecpar->extradata[0] == 1) {
const char *profile_space[4] = {"", ".A", ".B", ".C"};
codecs += profile_space[s->codecpar->extradata[1] >> 6 & 0x3]; //profile_space
codecs += string_format(".%d.", s->codecpar->extradata[1] & 0x1F); //profile_idc
codecs += profileCompat(s->codecpar->extradata+2);
codecs += string_format(".%c%d.", ((s->codecpar->extradata[1] >> 5) &0x1) ? 'H' : 'L', /* tier_flag */
s->codecpar->extradata[12]); /* level_idc */
codecs += constraintStr(s->codecpar->extradata+6);
} else {
codecs += string_format(
".%d.%d.%c%d.%c%d", s->codecpar->profile,
((s->codecpar->profile >> 5) & 0x1) + 5, ((s->codecpar->profile >> 5) & 0x1) == 0 ? 'L': 'H', s->codecpar->level,
s->codecpar->profile == 0 ? ' ' : ('A' + s->codecpar->profile-1),
((s->codecpar->level >> 1) & 0x7));
}
break;
case AV_CODEC_ID_AV1:
// AVCDecoderConfigurationRecord
if (s->codecpar->extradata_size > 4 && s->codecpar->extradata[0] == 0x81) {
codecs += string_format(
"av01.%d.%02d%c.%02d", (s->codecpar->extradata[1] >> 5) & 0x7,
s->codecpar->extradata[1] & 0x1F,
(s->codecpar->extradata[2] >> 7) & 0x1 ? 'H' : 'M',
(s->codecpar->extradata[2] >> 5) & 0x1
? 12
: (((s->codecpar->extradata[2] >> 6) & 0x1) ? 10 : 8));
} else {
codecs += string_format("av01.%d.%02d%c.%02d",
s->codecpar->profile, s->codecpar->level, 'M', 10);
}
break;
case AV_CODEC_ID_ALAC:
case AV_CODEC_ID_AAC:
// AudioSpecificConfig
/* 5 bits: object type
if (object type == 31)
6 bits + 32: object type
*/
if (s->codecpar->codec_tag) {
codecs += av_fourcc2str(s->codecpar->codec_tag);
} else {
codecs += "mp4a";
}
if (s->codecpar->extradata_size >= 2) {
codecs += ".40";
if ((s->codecpar->extradata[0] >> 3) == 0x1F) {
codecs += string_format("%d", (((s->codecpar->extradata[0] & 0x7) << 3) |
((s->codecpar->extradata[1] >> 5) & 0x7)) + 32);
} else {
codecs += string_format(".%d", ((s->codecpar->extradata[0]>>3) & 0x1F));
}
} else {
codecs += ".40";
}
break;
case AV_CODEC_ID_PCM_S16LE:
codecs += "0";
break;
case AV_CODEC_ID_PCM_ALAW:
codecs += "1";
break;
case AV_CODEC_ID_ADPCM_MS:
codecs += "2";
break;
case AV_CODEC_ID_PCM_F32LE:
codecs += "3";
break;
case AV_CODEC_ID_ADPCM_IMA_WAV:
codecs += "17";
break;
case AV_CODEC_ID_MP2:
case AV_CODEC_ID_MP3:
codecs += "85";
break;
case AV_CODEC_ID_MPEG4:
if (s->codecpar->codec_tag) {
codecs += av_fourcc2str(s->codecpar->codec_tag);
} else {
codecs =+ "mp4v";
}
break;
case AV_CODEC_ID_MJPEG:
mime = "image/jpeg";
break;
case AV_CODEC_ID_JPEG2000:
mime = "image/jp2";
break;
case AV_CODEC_ID_PNG:
mime = "image/png";
break;
case AV_CODEC_ID_PPM:
mime = "image/x-portable-pixmap";
break;
case AV_CODEC_ID_WEBP:
mime = "image/webp";
break;
case AV_CODEC_ID_TIFF:
mime = "image/tiff";
break;
case AV_CODEC_ID_GIF:
mime = "image/gif";
break;
case AV_CODEC_ID_BMP:
mime = "image/bmp";
break;
case AV_CODEC_ID_PAM:
mime = "image/x-portable-anymap";
break;
case AV_CODEC_ID_XBM:
mime = "image/xbm";
break;
case AV_CODEC_ID_XPM:
mime = "image/x-xpixmap";
break;
case AV_CODEC_ID_JPEGLS:
mime = "image/jpeg-ls";
break;
case AV_CODEC_ID_PIXLET:
mime = "image/vnd.dxf";
break;
case AV_CODEC_ID_VP8:
case AV_CODEC_ID_VP9:
case AV_CODEC_ID_VORBIS:
case AV_CODEC_ID_OPUS:
case AV_CODEC_ID_FLV1:
codecs += avcodec_get_name(s->codecpar->codec_id);
break;
default:
codecs += avcodec_get_name(s->codecpar->codec_id);
break;
}
}
avformat_close_input(&fmt_ctx);
if (0 == mime.compare(0, 5, "image")) {
return mime;
}
if (format && !format->mime_type) {
mime += string_format("%s/", av_get_media_type_string(type));
if (format->name) {
if (!strcmp(format->name, "mov")) {
mime += "quicktime";
} else {
mime += format->name;
}
}
} else if (!format) {
mime += string_format("%s/", av_get_media_type_string(type));
if (iformat->extensions) {
if (iformat->mime_type) {
mime += iformat->mime_type;
} else if (iformat->name) {
mime += iformat->name;
}
}
}
// printf("%s", mime);
if (codecs.length() > 0 && (!mime.compare(0, 5, "video", 5) || !mime.compare(0, 5, "audio", 5))) {
mime += "; ";
if (codecs.find(',') != std::string::npos) {
mime += "codecs=\"" + codecs + "\"";
} else {
mime += "codecs=" + codecs;
}
}
return mime;
}
#ifdef NATIVE_CLI
int main(int argc, char **argv)
{
std::string filename = argv[1];
std::string mime = getmime(filename);
std::cout << mime << std::endl;
return 0;
}
#else
EMSCRIPTEN_BINDINGS(ffmime) {
emscripten::function("getmime", &getmime);
}
#endif