agsantos | c9181b4 | 2020-11-26 12:03:04 -0500 | [diff] [blame] | 1 | /* |
Sébastien Blin | cb783e3 | 2021-02-12 11:34:10 -0500 | [diff] [blame^] | 2 | * Copyright (C) 2020-2021 Savoir-faire Linux Inc. |
agsantos | c9181b4 | 2020-11-26 12:03:04 -0500 | [diff] [blame] | 3 | * |
| 4 | * Author: Aline Gondim Santos <aline.gondimsantos@savoirfairelinux.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 3 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | */ |
| 20 | |
| 21 | #include "frameFilter.h" |
| 22 | |
| 23 | extern "C" { |
| 24 | #include <libavfilter/buffersink.h> |
| 25 | #include <libavfilter/buffersrc.h> |
| 26 | } |
| 27 | |
| 28 | #include <algorithm> |
| 29 | #include <functional> |
| 30 | #include <memory> |
| 31 | #include <sstream> |
| 32 | #include <thread> |
| 33 | |
| 34 | #include "pluglog.h" |
| 35 | |
| 36 | namespace jami { |
| 37 | |
| 38 | FrameFilter::FrameFilter() {} |
| 39 | |
| 40 | FrameFilter::~FrameFilter() |
| 41 | { |
| 42 | clean(); |
| 43 | } |
| 44 | |
| 45 | int |
| 46 | FrameFilter::initialize(const std::string& filterDesc, std::vector<MediaStream> msps) |
| 47 | { |
| 48 | int ret = 0; |
| 49 | desc_ = filterDesc; |
| 50 | graph_ = avfilter_graph_alloc(); |
| 51 | |
| 52 | if (!graph_) |
| 53 | return fail("Failed to allocate filter graph", AVERROR(ENOMEM)); |
| 54 | |
| 55 | graph_->nb_threads = std::max(1u, std::min(8u, std::thread::hardware_concurrency() / 2)); |
| 56 | |
| 57 | AVFilterInOut* in; |
| 58 | AVFilterInOut* out; |
| 59 | if ((ret = avfilter_graph_parse2(graph_, desc_.c_str(), &in, &out)) < 0) |
| 60 | return fail("Failed to parse filter graph", ret); |
| 61 | |
| 62 | using AVFilterInOutPtr = std::unique_ptr<AVFilterInOut, std::function<void(AVFilterInOut*)>>; |
| 63 | AVFilterInOutPtr outputs(out, [](AVFilterInOut* f) { avfilter_inout_free(&f); }); |
| 64 | AVFilterInOutPtr inputs(in, [](AVFilterInOut* f) { avfilter_inout_free(&f); }); |
| 65 | |
| 66 | if (outputs && outputs->next) |
| 67 | return fail("Filters with multiple outputs are not supported", AVERROR(ENOTSUP)); |
| 68 | |
| 69 | if ((ret = initOutputFilter(outputs.get())) < 0) |
| 70 | return fail("Failed to create output for filter graph", ret); |
| 71 | // make sure inputs linked list is the same size as msps |
| 72 | size_t count = 0; |
| 73 | AVFilterInOut* dummyInput = inputs.get(); |
| 74 | while (dummyInput && ++count) // increment count before evaluating its value |
| 75 | dummyInput = dummyInput->next; |
| 76 | if (count != msps.size()) |
| 77 | return fail( |
| 78 | "Size mismatch between number of inputs in filter graph and input parameter array", |
| 79 | AVERROR(EINVAL)); |
| 80 | for (AVFilterInOut* current = inputs.get(); current; current = current->next) { |
| 81 | if (!current->name) |
| 82 | return fail("Filters require non empty names", AVERROR(EINVAL)); |
| 83 | std::string name = current->name; |
| 84 | const auto& it = std::find_if(msps.begin(), msps.end(), [name](const MediaStream& msp) { |
| 85 | return msp.name == name; |
| 86 | }); |
| 87 | if (it != msps.end()) { |
| 88 | if ((ret = initInputFilter(current, *it)) < 0) { |
| 89 | std::string msg = "Failed to initialize input: " + name; |
| 90 | return fail(msg, ret); |
| 91 | } |
| 92 | } else { |
| 93 | std::string msg = "Failed to find matching parameters for: " + name; |
| 94 | return fail(msg, ret); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | if ((ret = avfilter_graph_config(graph_, nullptr)) < 0) |
| 99 | return fail("Failed to configure filter graph", ret); |
| 100 | |
| 101 | initialized_ = true; |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | MediaStream |
| 106 | FrameFilter::getInputParams(const std::string& inputName) const |
| 107 | { |
| 108 | for (auto ms : inputParams_) |
| 109 | if (ms.name == inputName) |
| 110 | return ms; |
| 111 | return {}; |
| 112 | } |
| 113 | |
| 114 | MediaStream |
| 115 | FrameFilter::getOutputParams() const |
| 116 | { |
| 117 | MediaStream output; |
| 118 | if (!output_ || !initialized_) { |
| 119 | fail("Filter not initialized", -1); |
| 120 | return output; |
| 121 | } |
| 122 | |
| 123 | switch (av_buffersink_get_type(output_)) { |
| 124 | case AVMEDIA_TYPE_VIDEO: |
| 125 | output.name = "videoOutput"; |
| 126 | output.format = av_buffersink_get_format(output_); |
| 127 | output.isVideo = true; |
| 128 | output.timeBase = av_buffersink_get_time_base(output_); |
| 129 | output.width = av_buffersink_get_w(output_); |
| 130 | output.height = av_buffersink_get_h(output_); |
| 131 | output.bitrate = 0; |
| 132 | output.frameRate = av_buffersink_get_frame_rate(output_); |
| 133 | break; |
| 134 | case AVMEDIA_TYPE_AUDIO: |
| 135 | output.name = "audioOutput"; |
| 136 | output.format = av_buffersink_get_format(output_); |
| 137 | output.isVideo = false; |
| 138 | output.timeBase = av_buffersink_get_time_base(output_); |
| 139 | output.sampleRate = av_buffersink_get_sample_rate(output_); |
| 140 | output.nbChannels = av_buffersink_get_channels(output_); |
| 141 | break; |
| 142 | default: |
| 143 | output.format = -1; |
| 144 | break; |
| 145 | } |
| 146 | return output; |
| 147 | } |
| 148 | |
| 149 | int |
| 150 | FrameFilter::feedEOF(const std::string& inputName) |
| 151 | { |
| 152 | int ret = 0; |
| 153 | if (!initialized_) |
| 154 | return fail("Filter not initialized", -1); |
| 155 | |
| 156 | for (size_t i = 0; i < inputs_.size(); ++i) { |
| 157 | auto& ms = inputParams_[i]; |
| 158 | if (ms.name != inputName) |
| 159 | continue; |
| 160 | |
| 161 | if ((ret = av_buffersrc_add_frame_flags(inputs_[i], nullptr, AV_BUFFERSRC_FLAG_PUSH)) < 0) |
| 162 | return fail("Could not pass frame to filters", ret); |
| 163 | else |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | std::stringstream ss; |
| 168 | ss << "Specified filter (" << inputName << ") not found"; |
| 169 | return fail(ss.str(), AVERROR(EINVAL)); |
| 170 | } |
| 171 | |
| 172 | int |
| 173 | FrameFilter::feedInput(AVFrame* frame, const std::string& inputName) |
| 174 | { |
| 175 | int ret = 0; |
| 176 | if (!initialized_) |
| 177 | return fail("Filter not initialized", -1); |
| 178 | |
| 179 | if (!frame) |
| 180 | return 0; |
| 181 | |
| 182 | for (size_t i = 0; i < inputs_.size(); ++i) { |
| 183 | auto& ms = inputParams_[i]; |
| 184 | if (ms.name != inputName) |
| 185 | continue; |
| 186 | |
| 187 | if (ms.format != frame->format |
| 188 | || (ms.isVideo && (ms.width != frame->width || ms.height != frame->height)) |
| 189 | || (!ms.isVideo |
| 190 | && (ms.sampleRate != frame->sample_rate || ms.nbChannels != frame->channels))) { |
| 191 | ms.update(frame); |
| 192 | if ((ret = reinitialize()) < 0) |
| 193 | return fail("Failed to reinitialize filter with new input parameters", ret); |
| 194 | } |
| 195 | |
| 196 | if ((ret = av_buffersrc_add_frame_flags(inputs_[i], frame, AV_BUFFERSRC_FLAG_KEEP_REF)) < 0) |
| 197 | return fail("Could not pass frame to filters", ret); |
| 198 | else |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | std::stringstream ss; |
| 203 | ss << "Specified filter (" << inputName << ") not found"; |
| 204 | return fail(ss.str(), AVERROR(EINVAL)); |
| 205 | } |
| 206 | |
| 207 | AVFrame* |
| 208 | FrameFilter::readOutput() |
| 209 | { |
| 210 | if (!initialized_) { |
| 211 | fail("Not properly initialized", -1); |
| 212 | return nullptr; |
| 213 | } |
| 214 | |
| 215 | AVFrame* frame = av_frame_alloc(); |
| 216 | |
| 217 | auto type = av_buffersink_get_type(output_); |
| 218 | if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) { |
| 219 | return nullptr; |
| 220 | } |
| 221 | auto err = av_buffersink_get_frame(output_, frame); |
| 222 | if (err >= 0) { |
| 223 | return frame; |
| 224 | } else if (err == AVERROR(EAGAIN)) { |
| 225 | fail("no data. ", err); |
| 226 | } else if (err == AVERROR_EOF) { |
| 227 | fail("eof. ", err); |
| 228 | } else { |
| 229 | fail("Error occurred while pulling from filter graph", err); |
| 230 | } |
| 231 | return nullptr; |
| 232 | } |
| 233 | |
| 234 | int |
| 235 | FrameFilter::initOutputFilter(AVFilterInOut* out) |
| 236 | { |
| 237 | int ret = 0; |
| 238 | const AVFilter* buffersink; |
agsantos | b3c9084 | 2020-12-10 14:19:41 -0500 | [diff] [blame] | 239 | AVFilterContext* buffersinkCtx{}; |
agsantos | c9181b4 | 2020-11-26 12:03:04 -0500 | [diff] [blame] | 240 | AVMediaType mediaType = avfilter_pad_get_type(out->filter_ctx->input_pads, out->pad_idx); |
| 241 | |
| 242 | if (mediaType == AVMEDIA_TYPE_VIDEO) |
| 243 | buffersink = avfilter_get_by_name("buffersink"); |
| 244 | else |
| 245 | buffersink = avfilter_get_by_name("abuffersink"); |
| 246 | |
| 247 | if ((ret |
| 248 | = avfilter_graph_create_filter(&buffersinkCtx, buffersink, "out", nullptr, nullptr, graph_)) |
| 249 | < 0) { |
| 250 | avfilter_free(buffersinkCtx); |
| 251 | return fail("Failed to create buffer sink", ret); |
| 252 | } |
| 253 | |
| 254 | if ((ret = avfilter_link(out->filter_ctx, out->pad_idx, buffersinkCtx, 0)) < 0) { |
| 255 | avfilter_free(buffersinkCtx); |
| 256 | return fail("Could not link buffer sink to graph", ret); |
| 257 | } |
| 258 | |
| 259 | output_ = buffersinkCtx; |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | int |
| 264 | FrameFilter::initInputFilter(AVFilterInOut* in, MediaStream msp) |
| 265 | { |
| 266 | int ret = 0; |
| 267 | AVBufferSrcParameters* params = av_buffersrc_parameters_alloc(); |
| 268 | if (!params) |
| 269 | return -1; |
| 270 | |
| 271 | const AVFilter* buffersrc; |
| 272 | AVMediaType mediaType = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx); |
| 273 | params->format = msp.format; |
| 274 | params->time_base = msp.timeBase; |
| 275 | if (mediaType == AVMEDIA_TYPE_VIDEO) { |
| 276 | params->width = msp.width; |
| 277 | params->height = msp.height; |
| 278 | params->frame_rate = msp.frameRate; |
| 279 | buffersrc = avfilter_get_by_name("buffer"); |
| 280 | } else { |
| 281 | params->sample_rate = msp.sampleRate; |
| 282 | params->channel_layout = av_get_default_channel_layout(msp.nbChannels); |
| 283 | buffersrc = avfilter_get_by_name("abuffer"); |
| 284 | } |
| 285 | |
agsantos | b3c9084 | 2020-12-10 14:19:41 -0500 | [diff] [blame] | 286 | AVFilterContext* buffersrcCtx{}; |
agsantos | c9181b4 | 2020-11-26 12:03:04 -0500 | [diff] [blame] | 287 | if (buffersrc) { |
| 288 | char name[128]; |
| 289 | snprintf(name, sizeof(name), "buffersrc_%s_%d", in->name, in->pad_idx); |
| 290 | buffersrcCtx = avfilter_graph_alloc_filter(graph_, buffersrc, name); |
| 291 | } |
| 292 | if (!buffersrcCtx) { |
| 293 | av_free(params); |
| 294 | return fail("Failed to allocate filter graph input", AVERROR(ENOMEM)); |
| 295 | } |
| 296 | ret = av_buffersrc_parameters_set(buffersrcCtx, params); |
| 297 | av_free(params); |
| 298 | if (ret < 0) |
| 299 | return fail("Failed to set filter graph input parameters", ret); |
| 300 | |
| 301 | if ((ret = avfilter_init_str(buffersrcCtx, nullptr)) < 0) |
| 302 | return fail("Failed to initialize buffer source", ret); |
| 303 | |
| 304 | if ((ret = avfilter_link(buffersrcCtx, 0, in->filter_ctx, in->pad_idx)) < 0) |
| 305 | return fail("Failed to link buffer source to graph", ret); |
| 306 | |
| 307 | inputs_.push_back(buffersrcCtx); |
| 308 | msp.name = in->name; |
| 309 | inputParams_.push_back(msp); |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | int |
| 314 | FrameFilter::reinitialize() |
| 315 | { |
| 316 | // keep parameters needed for initialization before clearing filter |
| 317 | auto params = std::move(inputParams_); |
| 318 | auto desc = std::move(desc_); |
| 319 | clean(); |
| 320 | auto ret = initialize(desc, params); |
| 321 | return ret; |
| 322 | } |
| 323 | |
| 324 | int |
| 325 | FrameFilter::fail(std::string msg, int err) const |
| 326 | { |
| 327 | if (!msg.empty()) |
| 328 | Plog::log(Plog::LogPriority::INFO, "Frame Filter: ", "("+std::to_string(err)+") "+msg); |
| 329 | return err; |
| 330 | } |
| 331 | |
| 332 | void |
| 333 | FrameFilter::clean() |
| 334 | { |
| 335 | initialized_ = false; |
| 336 | avfilter_graph_free(&graph_); // frees inputs_ and output_ |
| 337 | desc_.clear(); |
| 338 | inputs_.clear(); // don't point to freed memory |
| 339 | output_ = nullptr; // don't point to freed memory |
| 340 | inputParams_.clear(); |
| 341 | } |
| 342 | } // namespace jami |