368 lines
10 KiB
C++
368 lines
10 KiB
C++
#include "AudioStreamingPartInternal.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/third_party/base64/base64.h"
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extern "C" {
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#include <libavutil/timestamp.h>
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#include <libavformat/avformat.h>
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#include <libavcodec/avcodec.h>
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}
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#include <string>
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#include <bitset>
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#include <set>
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#include <map>
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namespace tgcalls {
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namespace {
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int16_t sampleFloatToInt16(float sample) {
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return av_clip_int16 (static_cast<int32_t>(lrint(sample*32767)));
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}
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uint32_t stringToUInt32(std::string const &string) {
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std::stringstream stringStream(string);
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uint32_t value = 0;
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stringStream >> value;
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return value;
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}
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template <typename Out>
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void splitString(const std::string &s, char delim, Out result) {
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std::istringstream iss(s);
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std::string item;
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while (std::getline(iss, item, delim)) {
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*result++ = item;
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}
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}
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std::vector<std::string> splitString(const std::string &s, char delim) {
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std::vector<std::string> elems;
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splitString(s, delim, std::back_inserter(elems));
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return elems;
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}
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static absl::optional<uint32_t> readInt32(std::string const &data, int &offset) {
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if (offset + 4 > data.length()) {
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return absl::nullopt;
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}
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int32_t value = 0;
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memcpy(&value, data.data() + offset, 4);
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offset += 4;
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return value;
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}
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std::vector<AudioStreamingPartInternal::ChannelUpdate> parseChannelUpdates(std::string const &data, int &offset) {
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std::vector<AudioStreamingPartInternal::ChannelUpdate> result;
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auto channels = readInt32(data, offset);
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if (!channels) {
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return {};
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}
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auto count = readInt32(data, offset);
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if (!count) {
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return {};
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}
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for (int i = 0; i < count.value(); i++) {
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auto frameIndex = readInt32(data, offset);
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if (!frameIndex) {
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return {};
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}
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auto channelId = readInt32(data, offset);
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if (!channelId) {
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return {};
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}
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auto ssrc = readInt32(data, offset);
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if (!ssrc) {
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return {};
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}
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AudioStreamingPartInternal::ChannelUpdate update;
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update.frameIndex = frameIndex.value();
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update.id = channelId.value();
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update.ssrc = ssrc.value();
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result.push_back(update);
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}
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return result;
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}
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}
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AudioStreamingPartInternal::AudioStreamingPartInternal(std::vector<uint8_t> &&fileData, std::string const &container) :
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_avIoContext(std::move(fileData)) {
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int ret = 0;
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_frame = av_frame_alloc();
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AVInputFormat *inputFormat = av_find_input_format(container.c_str());
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if (!inputFormat) {
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_didReadToEnd = true;
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return;
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}
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_inputFormatContext = avformat_alloc_context();
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if (!_inputFormatContext) {
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_didReadToEnd = true;
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return;
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}
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_inputFormatContext->pb = _avIoContext.getContext();
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if ((ret = avformat_open_input(&_inputFormatContext, "", inputFormat, nullptr)) < 0) {
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_didReadToEnd = true;
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return;
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}
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if ((ret = avformat_find_stream_info(_inputFormatContext, nullptr)) < 0) {
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_didReadToEnd = true;
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avformat_close_input(&_inputFormatContext);
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_inputFormatContext = nullptr;
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return;
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}
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for (int i = 0; i < _inputFormatContext->nb_streams; i++) {
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AVStream *inStream = _inputFormatContext->streams[i];
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AVCodecParameters *inCodecpar = inStream->codecpar;
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if (inCodecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
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continue;
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}
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_audioCodecParameters = avcodec_parameters_alloc();
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avcodec_parameters_copy(_audioCodecParameters, inCodecpar);
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_streamId = i;
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_durationInMilliseconds = (int)((inStream->duration + inStream->first_dts) * 1000 / 48000);
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if (inStream->metadata) {
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AVDictionaryEntry *entry = av_dict_get(inStream->metadata, "TG_META", nullptr, 0);
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if (entry && entry->value) {
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std::string result;
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size_t data_used = 0;
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std::string sourceBase64 = (const char *)entry->value;
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rtc::Base64::Decode(sourceBase64, rtc::Base64::DO_LAX, &result, &data_used);
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if (result.size() != 0) {
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int offset = 0;
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_channelUpdates = parseChannelUpdates(result, offset);
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}
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}
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uint32_t videoChannelMask = 0;
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entry = av_dict_get(inStream->metadata, "ACTIVE_MASK", nullptr, 0);
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if (entry && entry->value) {
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std::string sourceString = (const char *)entry->value;
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videoChannelMask = stringToUInt32(sourceString);
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}
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std::vector<std::string> endpointList;
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entry = av_dict_get(inStream->metadata, "ENDPOINTS", nullptr, 0);
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if (entry && entry->value) {
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std::string sourceString = (const char *)entry->value;
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endpointList = splitString(sourceString, ' ');
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}
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std::bitset<32> videoChannels(videoChannelMask);
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size_t endpointIndex = 0;
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if (videoChannels.count() == endpointList.size()) {
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for (size_t i = 0; i < videoChannels.size(); i++) {
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if (videoChannels[i]) {
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_endpointMapping.insert(std::make_pair(endpointList[endpointIndex], i));
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endpointIndex++;
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}
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}
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}
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}
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break;
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}
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if (_streamId == -1) {
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_didReadToEnd = true;
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}
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}
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AudioStreamingPartInternal::~AudioStreamingPartInternal() {
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if (_frame) {
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av_frame_unref(_frame);
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}
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if (_inputFormatContext) {
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avformat_close_input(&_inputFormatContext);
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}
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if (_audioCodecParameters) {
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avcodec_parameters_free(&_audioCodecParameters);
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}
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}
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AudioStreamingPartInternal::ReadPcmResult AudioStreamingPartInternal::readPcm(AudioStreamingPartPersistentDecoder &persistentDecoder, std::vector<int16_t> &outPcm) {
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if (_didReadToEnd) {
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return AudioStreamingPartInternal::ReadPcmResult();
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}
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int outPcmSampleOffset = 0;
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ReadPcmResult result;
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if (_pcmBufferSampleOffset >= _pcmBufferSampleSize) {
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fillPcmBuffer(persistentDecoder);
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}
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if (outPcm.size() != 480 * _channelCount) {
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outPcm.resize(480 * _channelCount);
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}
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int readSamples = 0;
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if (_channelCount != 0) {
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readSamples = (int)outPcm.size() / _channelCount;
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}
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while (outPcmSampleOffset < readSamples) {
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if (_pcmBufferSampleOffset >= _pcmBufferSampleSize) {
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fillPcmBuffer(persistentDecoder);
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if (_pcmBufferSampleOffset >= _pcmBufferSampleSize) {
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break;
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}
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}
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int readFromPcmBufferSamples = std::min(_pcmBufferSampleSize - _pcmBufferSampleOffset, readSamples - outPcmSampleOffset);
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if (readFromPcmBufferSamples != 0) {
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std::copy(_pcmBuffer.begin() + _pcmBufferSampleOffset * _channelCount, _pcmBuffer.begin() + _pcmBufferSampleOffset * _channelCount + readFromPcmBufferSamples * _channelCount, outPcm.begin() + outPcmSampleOffset * _channelCount);
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_pcmBufferSampleOffset += readFromPcmBufferSamples;
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outPcmSampleOffset += readFromPcmBufferSamples;
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result.numSamples += readFromPcmBufferSamples;
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_readSampleCount += readFromPcmBufferSamples;
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}
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}
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result.numChannels = _channelCount;
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// Uncomment for debugging incomplete frames
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/*if (result.numSamples != 480 && result.numSamples != 0) {
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RTC_LOG(LS_INFO) << "result.numSamples = " << result.numSamples << ", _readSampleCount = " << _readSampleCount << ", duration = " << _inputFormatContext->streams[_streamId]->duration;
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}*/
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return result;
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}
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int AudioStreamingPartInternal::getDurationInMilliseconds() const {
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return _durationInMilliseconds;
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}
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std::vector<AudioStreamingPartInternal::ChannelUpdate> const &AudioStreamingPartInternal::getChannelUpdates() const {
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return _channelUpdates;
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}
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std::map<std::string, int32_t> AudioStreamingPartInternal::getEndpointMapping() const {
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return _endpointMapping;
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}
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void AudioStreamingPartInternal::fillPcmBuffer(AudioStreamingPartPersistentDecoder &persistentDecoder) {
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_pcmBufferSampleSize = 0;
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_pcmBufferSampleOffset = 0;
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if (_didReadToEnd) {
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return;
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}
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if (!_inputFormatContext) {
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_didReadToEnd = true;
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return;
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}
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int ret = 0;
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while (true) {
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ret = av_read_frame(_inputFormatContext, &_packet);
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if (ret < 0) {
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_didReadToEnd = true;
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return;
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}
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if (_packet.stream_index != _streamId) {
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continue;
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}
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ret = persistentDecoder.decode(_audioCodecParameters, _inputFormatContext->streams[_streamId]->time_base, _packet, _frame);
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if (ret == AVERROR(EAGAIN)) {
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continue;
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}
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break;
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}
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if (ret != 0) {
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_didReadToEnd = true;
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return;
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}
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if (_channelCount == 0) {
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_channelCount = _frame->channels;
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}
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if (_channelCount == 0) {
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_didReadToEnd = true;
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return;
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}
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if (_frame->channels != _channelCount || _frame->channels > 8) {
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_didReadToEnd = true;
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return;
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}
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if (_pcmBuffer.size() < _frame->nb_samples * _frame->channels) {
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_pcmBuffer.resize(_frame->nb_samples * _frame->channels);
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}
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switch (_frame->format) {
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case AV_SAMPLE_FMT_S16: {
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memcpy(_pcmBuffer.data(), _frame->data[0], _frame->nb_samples * 2 * _frame->channels);
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} break;
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case AV_SAMPLE_FMT_S16P: {
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int16_t *to = _pcmBuffer.data();
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for (int sample = 0; sample < _frame->nb_samples; ++sample) {
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for (int channel = 0; channel < _frame->channels; ++channel) {
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int16_t *shortChannel = (int16_t*)_frame->data[channel];
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*to++ = shortChannel[sample];
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}
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}
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} break;
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case AV_SAMPLE_FMT_FLT: {
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float *floatData = (float *)&_frame->data[0];
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for (int i = 0; i < _frame->nb_samples * _frame->channels; i++) {
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_pcmBuffer[i] = sampleFloatToInt16(floatData[i]);
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}
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} break;
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case AV_SAMPLE_FMT_FLTP: {
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int16_t *to = _pcmBuffer.data();
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for (int sample = 0; sample < _frame->nb_samples; ++sample) {
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for (int channel = 0; channel < _frame->channels; ++channel) {
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float *floatChannel = (float*)_frame->data[channel];
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*to++ = sampleFloatToInt16(floatChannel[sample]);
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}
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}
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} break;
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default: {
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RTC_FATAL() << "Unexpected sample_fmt";
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} break;
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}
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_pcmBufferSampleSize = _frame->nb_samples;
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_pcmBufferSampleOffset = 0;
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}
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}
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