X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=ffmpeg_capture.cpp;h=0fe74a7a95b46e3a891425ed60f7dbb6408ff95d;hb=8cefe0ef1926be7931d4a9bbfed93ee6e85f3540;hp=5474c52fd94f511491206e4f8a92b2545bc87475;hpb=f07adb19f0e2571bf4894ec57e6fcfe4a3e5fd95;p=nageru diff --git a/ffmpeg_capture.cpp b/ffmpeg_capture.cpp index 5474c52..0fe74a7 100644 --- a/ffmpeg_capture.cpp +++ b/ffmpeg_capture.cpp @@ -6,6 +6,7 @@ #include #include #include +#include #include extern "C" { @@ -27,6 +28,7 @@ extern "C" { #include "bmusb/bmusb.h" #include "ffmpeg_raii.h" +#include "ffmpeg_util.h" #include "flags.h" #include "image_input.h" @@ -35,6 +37,7 @@ extern "C" { using namespace std; using namespace std::chrono; using namespace bmusb; +using namespace movit; namespace { @@ -44,6 +47,156 @@ steady_clock::time_point compute_frame_start(int64_t frame_pts, int64_t pts_orig return origin + duration_cast(pts / rate); } +bool changed_since(const std::string &pathname, const timespec &ts) +{ + if (ts.tv_sec < 0) { + return false; + } + struct stat buf; + if (stat(pathname.c_str(), &buf) != 0) { + fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str()); + return false; + } + return (buf.st_mtim.tv_sec != ts.tv_sec || buf.st_mtim.tv_nsec != ts.tv_nsec); +} + +bool is_full_range(const AVPixFmtDescriptor *desc) +{ + // This is horrible, but there's no better way that I know of. + return (strchr(desc->name, 'j') != nullptr); +} + +AVPixelFormat decide_dst_format(AVPixelFormat src_format, bmusb::PixelFormat dst_format_type) +{ + if (dst_format_type == bmusb::PixelFormat_8BitBGRA) { + return AV_PIX_FMT_BGRA; + } + + assert(dst_format_type == bmusb::PixelFormat_8BitYCbCrPlanar); + + // If this is a non-Y'CbCr format, just convert to 4:4:4 Y'CbCr + // and be done with it. It's too strange to spend a lot of time on. + // (Let's hope there's no alpha.) + const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_format); + if (src_desc == nullptr || + src_desc->nb_components != 3 || + (src_desc->flags & AV_PIX_FMT_FLAG_RGB)) { + return AV_PIX_FMT_YUV444P; + } + + // The best for us would be Cb and Cr together if possible, + // but FFmpeg doesn't support that except in the special case of + // NV12, so we need to go to planar even for the case of NV12. + // Thus, look for the closest (but no worse) 8-bit planar Y'CbCr format + // that matches in color range. (This will also include the case of + // the source format already being acceptable.) + bool src_full_range = is_full_range(src_desc); + const char *best_format = "yuv444p"; + unsigned best_score = numeric_limits::max(); + for (const AVPixFmtDescriptor *desc = av_pix_fmt_desc_next(nullptr); + desc; + desc = av_pix_fmt_desc_next(desc)) { + // Find planar Y'CbCr formats only. + if (desc->nb_components != 3) continue; + if (desc->flags & AV_PIX_FMT_FLAG_RGB) continue; + if (!(desc->flags & AV_PIX_FMT_FLAG_PLANAR)) continue; + if (desc->comp[0].plane != 0 || + desc->comp[1].plane != 1 || + desc->comp[2].plane != 2) continue; + + // 8-bit formats only. + if (desc->flags & AV_PIX_FMT_FLAG_BE) continue; + if (desc->comp[0].depth != 8) continue; + + // Same or better chroma resolution only. + int chroma_w_diff = desc->log2_chroma_w - src_desc->log2_chroma_w; + int chroma_h_diff = desc->log2_chroma_h - src_desc->log2_chroma_h; + if (chroma_w_diff < 0 || chroma_h_diff < 0) + continue; + + // Matching full/limited range only. + if (is_full_range(desc) != src_full_range) + continue; + + // Pick something with as little excess chroma resolution as possible. + unsigned score = (1 << (chroma_w_diff)) << chroma_h_diff; + if (score < best_score) { + best_score = score; + best_format = desc->name; + } + } + return av_get_pix_fmt(best_format); +} + +YCbCrFormat decode_ycbcr_format(const AVPixFmtDescriptor *desc, const AVFrame *frame) +{ + YCbCrFormat format; + AVColorSpace colorspace = av_frame_get_colorspace(frame); + switch (colorspace) { + case AVCOL_SPC_BT709: + format.luma_coefficients = YCBCR_REC_709; + break; + case AVCOL_SPC_BT470BG: + case AVCOL_SPC_SMPTE170M: + case AVCOL_SPC_SMPTE240M: + format.luma_coefficients = YCBCR_REC_601; + break; + case AVCOL_SPC_BT2020_NCL: + format.luma_coefficients = YCBCR_REC_2020; + break; + case AVCOL_SPC_UNSPECIFIED: + format.luma_coefficients = (frame->height >= 720 ? YCBCR_REC_709 : YCBCR_REC_601); + break; + default: + fprintf(stderr, "Unknown Y'CbCr coefficient enum %d from FFmpeg; choosing Rec. 709.\n", + colorspace); + format.luma_coefficients = YCBCR_REC_709; + break; + } + + format.full_range = is_full_range(desc); + format.num_levels = 1 << desc->comp[0].depth; + format.chroma_subsampling_x = 1 << desc->log2_chroma_w; + format.chroma_subsampling_y = 1 << desc->log2_chroma_h; + + switch (frame->chroma_location) { + case AVCHROMA_LOC_LEFT: + format.cb_x_position = 0.0; + format.cb_y_position = 0.5; + break; + case AVCHROMA_LOC_CENTER: + format.cb_x_position = 0.5; + format.cb_y_position = 0.5; + break; + case AVCHROMA_LOC_TOPLEFT: + format.cb_x_position = 0.0; + format.cb_y_position = 0.0; + break; + case AVCHROMA_LOC_TOP: + format.cb_x_position = 0.5; + format.cb_y_position = 0.0; + break; + case AVCHROMA_LOC_BOTTOMLEFT: + format.cb_x_position = 0.0; + format.cb_y_position = 1.0; + break; + case AVCHROMA_LOC_BOTTOM: + format.cb_x_position = 0.5; + format.cb_y_position = 1.0; + break; + default: + fprintf(stderr, "Unknown chroma location coefficient enum %d from FFmpeg; choosing Rec. 709.\n", + frame->chroma_location); + format.cb_x_position = 0.5; + format.cb_y_position = 0.5; + break; + } + + format.cr_x_position = format.cb_x_position; + format.cr_y_position = format.cb_y_position; + return format; +} + } // namespace FFmpegCapture::FFmpegCapture(const string &filename, unsigned width, unsigned height) @@ -51,6 +204,8 @@ FFmpegCapture::FFmpegCapture(const string &filename, unsigned width, unsigned he { // Not really used for anything. description = "Video: " + filename; + + avformat_network_init(); // In case someone wants this. } FFmpegCapture::~FFmpegCapture() @@ -121,12 +276,14 @@ void FFmpegCapture::producer_thread_func() string pathname = search_for_file(filename); if (filename.empty()) { fprintf(stderr, "%s not found, sleeping one second and trying again...\n", filename.c_str()); + send_disconnected_frame(); producer_thread_should_quit.sleep_for(seconds(1)); continue; } if (!play_video(pathname)) { // Error. fprintf(stderr, "Error when playing %s, sleeping one second and trying again...\n", pathname.c_str()); + send_disconnected_frame(); producer_thread_should_quit.sleep_for(seconds(1)); continue; } @@ -140,8 +297,42 @@ void FFmpegCapture::producer_thread_func() } } +void FFmpegCapture::send_disconnected_frame() +{ + // Send an empty frame to signal that we have no signal anymore. + FrameAllocator::Frame video_frame = video_frame_allocator->alloc_frame(); + if (video_frame.data) { + VideoFormat video_format; + video_format.width = width; + video_format.height = height; + video_format.stride = width * 4; + video_format.frame_rate_nom = 60; + video_format.frame_rate_den = 1; + video_format.is_connected = false; + + video_frame.len = width * height * 4; + memset(video_frame.data, 0, video_frame.len); + + frame_callback(timecode++, + video_frame, /*video_offset=*/0, video_format, + FrameAllocator::Frame(), /*audio_offset=*/0, AudioFormat()); + } +} + bool FFmpegCapture::play_video(const string &pathname) { + // Note: Call before open, not after; otherwise, there's a race. + // (There is now, too, but it tips the correct way. We could use fstat() + // if we had the file descriptor.) + timespec last_modified; + struct stat buf; + if (stat(pathname.c_str(), &buf) != 0) { + // Probably some sort of protocol, so can't stat. + last_modified.tv_sec = -1; + } else { + last_modified = buf.st_mtim; + } + auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr); if (format_ctx == nullptr) { fprintf(stderr, "%s: Error opening file\n", pathname.c_str()); @@ -153,25 +344,14 @@ bool FFmpegCapture::play_video(const string &pathname) return false; } - int video_stream_index = -1, audio_stream_index = -1; - AVRational video_timebase{ 1, 1 }; - for (unsigned i = 0; i < format_ctx->nb_streams; ++i) { - if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && - video_stream_index == -1) { - video_stream_index = i; - video_timebase = format_ctx->streams[i]->time_base; - } - if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && - audio_stream_index == -1) { - audio_stream_index = i; - } - } + int video_stream_index = find_stream_index(format_ctx.get(), AVMEDIA_TYPE_VIDEO); if (video_stream_index == -1) { fprintf(stderr, "%s: No video stream found\n", pathname.c_str()); return false; } const AVCodecParameters *codecpar = format_ctx->streams[video_stream_index]->codecpar; + AVRational video_timebase = format_ctx->streams[video_stream_index]->time_base; AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr); if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) { fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str()); @@ -189,13 +369,12 @@ bool FFmpegCapture::play_video(const string &pathname) unique_ptr codec_ctx_cleanup( codec_ctx.get(), avcodec_close); - int64_t pts_origin = 0, last_pts = 0; - steady_clock::time_point start = steady_clock::now(); - steady_clock::time_point next_frame_start = start; + internal_rewind(); double rate = 1.0; unique_ptr sws_ctx(nullptr, sws_freeContext); - int sws_last_width = -1, sws_last_height = -1; + int sws_last_width = -1, sws_last_height = -1, sws_last_src_format = -1; + AVPixelFormat sws_dst_format = AVPixelFormat(-1); // In practice, always initialized. // Main loop. while (!producer_thread_should_quit.should_quit()) { @@ -211,8 +390,14 @@ bool FFmpegCapture::play_video(const string &pathname) if (av_seek_frame(format_ctx.get(), /*stream_index=*/-1, /*timestamp=*/0, /*flags=*/0) < 0) { fprintf(stderr, "%s: Rewind failed, stopping play.\n", pathname.c_str()); } - pts_origin = last_pts = 0; - start = next_frame_start = steady_clock::now(); + // If the file has changed since last time, return to get it reloaded. + // Note that depending on how you move the file into place, you might + // end up corrupting the one you're already playing, so this path + // might not trigger. + if (changed_since(pathname, last_modified)) { + return true; + } + internal_rewind(); break; case QueuedCommand::CHANGE_RATE: @@ -263,18 +448,29 @@ bool FFmpegCapture::play_video(const string &pathname) fprintf(stderr, "%s: Rewind failed, not looping.\n", pathname.c_str()); return true; } - pts_origin = last_pts = 0; - start = steady_clock::now(); + // If the file has changed since last time, return to get it reloaded. + // Note that depending on how you move the file into place, you might + // end up corrupting the one you're already playing, so this path + // might not trigger. + if (changed_since(pathname, last_modified)) { + return true; + } + internal_rewind(); continue; } - if (sws_ctx == nullptr || sws_last_width != frame->width || sws_last_height != frame->height) { + if (sws_ctx == nullptr || + sws_last_width != frame->width || + sws_last_height != frame->height || + sws_last_src_format != frame->format) { + sws_dst_format = decide_dst_format(AVPixelFormat(frame->format), pixel_format); sws_ctx.reset( - sws_getContext(frame->width, frame->height, (AVPixelFormat)frame->format, - width, height, AV_PIX_FMT_RGBA, + sws_getContext(frame->width, frame->height, AVPixelFormat(frame->format), + width, height, sws_dst_format, SWS_BICUBIC, nullptr, nullptr, nullptr)); sws_last_width = frame->width; sws_last_height = frame->height; + sws_last_src_format = frame->format; } if (sws_ctx == nullptr) { fprintf(stderr, "%s: Could not create scaler context\n", pathname.c_str()); @@ -284,9 +480,19 @@ bool FFmpegCapture::play_video(const string &pathname) VideoFormat video_format; video_format.width = width; video_format.height = height; - video_format.stride = width * 4; + if (pixel_format == bmusb::PixelFormat_8BitBGRA) { + video_format.stride = width * 4; + } else { + assert(pixel_format == bmusb::PixelFormat_8BitYCbCrPlanar); + video_format.stride = width; + } video_format.frame_rate_nom = video_timebase.den; video_format.frame_rate_den = av_frame_get_pkt_duration(frame.get()) * video_timebase.num; + if (video_format.frame_rate_nom == 0 || video_format.frame_rate_den == 0) { + // Invalid frame rate. + video_format.frame_rate_nom = 60; + video_format.frame_rate_den = 1; + } video_format.has_signal = true; video_format.is_connected = true; @@ -295,10 +501,33 @@ bool FFmpegCapture::play_video(const string &pathname) FrameAllocator::Frame video_frame = video_frame_allocator->alloc_frame(); if (video_frame.data != nullptr) { - uint8_t *pic_data[4] = { video_frame.data, nullptr, nullptr, nullptr }; - int linesizes[4] = { int(video_format.stride), 0, 0, 0 }; + uint8_t *pic_data[4] = { nullptr, nullptr, nullptr, nullptr }; + int linesizes[4] = { 0, 0, 0, 0 }; + if (pixel_format == bmusb::PixelFormat_8BitBGRA) { + pic_data[0] = video_frame.data; + linesizes[0] = video_format.stride; + video_frame.len = video_format.stride * height; + } else { + assert(pixel_format == bmusb::PixelFormat_8BitYCbCrPlanar); + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(sws_dst_format); + + int chroma_width = AV_CEIL_RSHIFT(int(width), desc->log2_chroma_w); + int chroma_height = AV_CEIL_RSHIFT(int(height), desc->log2_chroma_h); + + pic_data[0] = video_frame.data; + linesizes[0] = width; + + pic_data[1] = pic_data[0] + width * height; + linesizes[1] = chroma_width; + + pic_data[2] = pic_data[1] + chroma_width * chroma_height; + linesizes[2] = chroma_width; + + video_frame.len = width * height + 2 * chroma_width * chroma_height; + + current_frame_ycbcr_format = decode_ycbcr_format(desc, frame.get()); + } sws_scale(sws_ctx.get(), frame->data, frame->linesize, 0, frame->height, pic_data, linesizes); - video_frame.len = video_format.stride * height; video_frame.received_timestamp = next_frame_start; } @@ -314,3 +543,9 @@ bool FFmpegCapture::play_video(const string &pathname) } return true; } + +void FFmpegCapture::internal_rewind() +{ + pts_origin = last_pts = 0; + start = next_frame_start = steady_clock::now(); +}