Megapixels/src/process_pipeline.c

#include "process_pipeline.h"

#include "gles2_debayer.h"
#include "io_pipeline.h"
#include "main.h"
#include "pipeline.h"
#include "state.h"
#include "zbar_pipeline.h"
#include <assert.h>
#include <gtk/gtk.h>
#include <math.h>
#include <tiffio.h>
#ifndef SYSCONFDIR
#include "config.h"
#endif

#include "dcp.h"
#include "gl_util.h"
#include <sys/mman.h>

#define TIFFTAG_FORWARDMATRIX1 50964
#define TIFFTAG_FORWARDMATRIX2 50965

static const float colormatrix_srgb[] = { 3.2409f,  -1.5373f, -0.4986f,
                                          -0.9692f, 1.8759f,  0.0415f,
                                          0.0556f,  -0.2039f, 1.0569f };

static MPPipeline *pipeline;
mp_state_proc state_proc;

static char burst_dir[23];

static volatile bool is_capturing = false;
static volatile int frames_processed = 0;
static volatile int frames_received = 0;

libmegapixels_camera *pr_camera;

static int output_buffer_width = -1;
static int output_buffer_height = -1;

static bool flash_enabled;

static char capture_fname[255];

static GSettings *settings;

static void
register_custom_tiff_tags(TIFF *tif)
{
        static const TIFFFieldInfo custom_fields[] = {
                { TIFFTAG_FORWARDMATRIX1,
                  -1,
                  -1,
                  TIFF_SRATIONAL,
                  FIELD_CUSTOM,
                  1,
                  1,
                  "ForwardMatrix1" },
                { TIFFTAG_FORWARDMATRIX2,
                  -1,
                  -1,
                  TIFF_SRATIONAL,
                  FIELD_CUSTOM,
                  1,
                  1,
                  "ForwardMatrix2" },
                { DCPTAG_PROFILE_TONE_CURVE,
                  -1,
                  -1,
                  TIFF_FLOAT,
                  FIELD_CUSTOM,
                  1,
                  1,
                  "ProfileToneCurve" },
                { DCPTAG_PROFILE_HUE_SAT_MAP_DIMS,
                  -1,
                  -1,
                  TIFF_FLOAT,
                  FIELD_CUSTOM,
                  1,
                  1,
                  "ProfileHueSatMapDims" },
                { DCPTAG_PROFILE_HUE_SAT_MAP_DATA_1,
                  -1,
                  -1,
                  TIFF_FLOAT,
                  FIELD_CUSTOM,
                  1,
                  1,
                  "ProfileHueSatMapData1" },
                { DCPTAG_PROFILE_HUE_SAT_MAP_DATA_2,
                  -1,
                  -1,
                  TIFF_FLOAT,
                  FIELD_CUSTOM,
                  1,
                  1,
                  "ProfileHueSatMapData2" },
        };

        // Add missing dng fields
        TIFFMergeFieldInfo(tif,
                           custom_fields,
                           sizeof(custom_fields) / sizeof(custom_fields[0]));
}

void
mp_process_find_all_processors(GtkListStore *store)
{
        GtkTreeIter iter;
        char buffer[512];
        // Find all the original postprocess.sh locations

        // Check postprocess.sh in the current working directory
        if (access("./data/postprocess.sh", F_OK) != -1) {
                gtk_list_store_insert(store, &iter, -1);
                gtk_list_store_set(store,
                                   &iter,
                                   0,
                                   "./data/postprocess.sh",
                                   1,
                                   "(cwd) postprocess.sh",
                                   -1);
        }

        // Check for a script in XDG_CONFIG_HOME
        sprintf(buffer, "%s/megapixels/postprocess.sh", g_get_user_config_dir());
        if (access(buffer, F_OK) != -1) {
                gtk_list_store_insert(store, &iter, -1);
                gtk_list_store_set(
                        store, &iter, 0, buffer, 1, "(user) postprocess.sh", -1);
        }

        // Check user overridden /etc/megapixels/postprocessor.sh
        sprintf(buffer, "%s/megapixels/postprocess.sh", SYSCONFDIR);
        if (access(buffer, F_OK) != -1) {
                gtk_list_store_insert(store, &iter, -1);
                gtk_list_store_set(
                        store, &iter, 0, buffer, 1, "(system) postprocess.sh", -1);
        }

        // Check user overridden /usr/share/megapixels/postprocessor.sh
        sprintf(buffer, "%s/megapixels/postprocess.sh", DATADIR);
        if (access(buffer, F_OK) != -1) {
                gtk_list_store_insert(store, &iter, -1);
                gtk_list_store_set(
                        store, &iter, 0, buffer, 1, "(built-in) postprocess.sh", -1);
        }

        // Find extra packaged postprocessor scripts
        // These should be packaged in
        // /usr/share/megapixels/postprocessor.d/executable
        sprintf(buffer, "%s/megapixels/postprocessor.d", DATADIR);
        DIR *d;
        struct dirent *dir;
        d = opendir(buffer);
        if (d) {
                while ((dir = readdir(d)) != NULL) {
                        if (dir->d_name[0] == '.') {
                                continue;
                        }
                        sprintf(buffer,
                                "%s/megapixels/postprocessor.d/%s",
                                DATADIR,
                                dir->d_name);
                        gtk_list_store_insert(store, &iter, -1);
                        gtk_list_store_set(
                                store, &iter, 0, buffer, 1, dir->d_name, -1);
                }
                closedir(d);
        }
}

bool
mp_process_find_processor(char *script)
{
        char filename[] = "postprocess.sh";

        // Check postprocess.sh in the current working directory
        sprintf(script, "./data/%s", filename);
        if (access(script, F_OK) != -1) {
                sprintf(script, "./data/%s", filename);
                printf("Found postprocessor script at %s\n", script);
                return true;
        }

        // Check for a script in XDG_CONFIG_HOME
        sprintf(script, "%s/megapixels/%s", g_get_user_config_dir(), filename);
        if (access(script, F_OK) != -1) {
                printf("Found postprocessor script at %s\n", script);
                return true;
        }

        // Check user overridden /etc/megapixels/postprocessor.sh
        sprintf(script, "%s/megapixels/%s", SYSCONFDIR, filename);
        if (access(script, F_OK) != -1) {
                printf("Found postprocessor script at %s\n", script);
                return true;
        }

        // Check packaged /usr/share/megapixels/postprocessor.sh
        sprintf(script, "%s/megapixels/%s", DATADIR, filename);
        if (access(script, F_OK) != -1) {
                printf("Found postprocessor script at %s\n", script);
                return true;
        }

        return false;
}

static void
setup(MPPipeline *pipeline, const void *data)
{
        TIFFSetTagExtender(register_custom_tiff_tags);
        settings = g_settings_new("org.postmarketos.Megapixels");
}

void
mp_process_pipeline_start()
{
        pipeline = mp_pipeline_new();
        mp_pipeline_invoke(pipeline, setup, NULL, 0);
        mp_zbar_pipeline_start();
}

void
mp_process_pipeline_stop()
{
        mp_pipeline_free(pipeline);
        mp_zbar_pipeline_stop();
}

void
mp_process_pipeline_sync()
{
        mp_pipeline_sync(pipeline);
}

#define NUM_BUFFERS 4

struct _MPProcessPipelineBuffer {
        GLuint texture_id;

        _Atomic(int) refcount;
};
static MPProcessPipelineBuffer output_buffers[NUM_BUFFERS];

void
mp_process_pipeline_buffer_ref(MPProcessPipelineBuffer *buf)
{
        ++buf->refcount;
}

void
mp_process_pipeline_buffer_unref(MPProcessPipelineBuffer *buf)
{
        --buf->refcount;
}

uint32_t
mp_process_pipeline_buffer_get_texture_id(MPProcessPipelineBuffer *buf)
{
        return buf->texture_id;
}

static void
repack_image_sequencial(const uint8_t *src_buf,
                        uint8_t *dst_buf,
                        libmegapixels_mode *mode)
{
        uint16_t pixels[4];
        uint32_t row_length =
                libmegapixels_mode_width_to_bytes(mode->format, mode->width);
        uint32_t padding_bytes =
                libmegapixels_mode_width_to_padding(mode->format, mode->width);
        size_t si = 0;

        // Image data must be 10-bit packed
        assert(libmegapixels_format_bits_per_pixel(mode->format) == 10);

        /*
         * Repack 40 bits stored in sensor format into sequencial format
         *
         * src_buf: 11111111 22222222 33333333 44444444 11223344 ...
         * dst_buf: 11111111 11222222 22223333 33333344 44444444 ...
         */
        for (size_t i = 0; i < row_length * mode->height; i += 5) {
                // Skip padding bytes in source buffer
                if (i && i % row_length == 0)
                        si += padding_bytes;

                /* Extract pixels from packed sensor format */
                pixels[0] = (src_buf[si] << 2) | (src_buf[si + 4] >> 6);
                pixels[1] = (src_buf[si + 1] << 2) | (src_buf[si + 4] >> 4 & 0x03);
                pixels[2] = (src_buf[si + 2] << 2) | (src_buf[si + 4] >> 2 & 0x03);
                pixels[3] = (src_buf[si + 3] << 2) | (src_buf[si + 4] & 0x03);

                /* Pack pixels into sequencial format */
                dst_buf[i] = (pixels[0] >> 2 & 0xff);
                dst_buf[i + 1] = (pixels[0] << 6 & 0xff) | (pixels[1] >> 4 & 0x3f);
                dst_buf[i + 2] = (pixels[1] << 4 & 0xff) | (pixels[2] >> 6 & 0x0f);
                dst_buf[i + 3] = (pixels[2] << 2 & 0xff) | (pixels[3] >> 8 & 0x03);
                dst_buf[i + 4] = (pixels[3] & 0xff);

                si += 5;
        }
}

static GLES2Debayer *gles2_debayer = NULL;

static GdkGLContext *context;

// #define RENDERDOC

#ifdef RENDERDOC
#include <renderdoc/app.h>
extern RENDERDOC_API_1_1_2 *rdoc_api;
#endif

static void
init_gl(MPPipeline *pipeline, GdkSurface **surface)
{
        GError *error = NULL;
        context = gdk_surface_create_gl_context(*surface, &error);
        if (context == NULL) {
                printf("Failed to initialize OpenGL context: %s\n", error->message);
                g_clear_error(&error);
                return;
        }

        gdk_gl_context_set_use_es(context, true);
        gdk_gl_context_set_required_version(context, 2, 0);
        gdk_gl_context_set_forward_compatible(context, false);
#ifdef DEBUG
        gdk_gl_context_set_debug_enabled(context, true);
#else
        gdk_gl_context_set_debug_enabled(context, false);
#endif

        gdk_gl_context_realize(context, &error);
        if (error != NULL) {
                printf("Failed to create OpenGL context: %s\n", error->message);
                g_clear_object(&context);
                g_clear_error(&error);
                return;
        }

        gdk_gl_context_make_current(context);
        check_gl();

        // Make a VAO for OpenGL
        if (!gdk_gl_context_get_use_es(context)) {
                GLuint vao;
                glGenVertexArrays(1, &vao);
                glBindVertexArray(vao);
                check_gl();
        }

        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        check_gl();

        for (size_t i = 0; i < NUM_BUFFERS; ++i) {
                glGenTextures(1, &output_buffers[i].texture_id);
                glBindTexture(GL_TEXTURE_2D, output_buffers[i].texture_id);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        }

        glBindTexture(GL_TEXTURE_2D, 0);

        gboolean is_es = gdk_gl_context_get_use_es(context);
        int major, minor;
        gdk_gl_context_get_version(context, &major, &minor);

        printf("Initialized %s %d.%d\n",
               is_es ? "OpenGL ES" : "OpenGL",
               major,
               minor);
}

void
mp_process_pipeline_init_gl(GdkSurface *surface)
{
        mp_pipeline_invoke(pipeline,
                           (MPPipelineCallback)init_gl,
                           &surface,
                           sizeof(GdkSurface *));
}

static GdkTexture *
process_image_for_preview(const uint8_t *image)
{
#ifdef PROFILE_DEBAYER
        clock_t t1 = clock();
#endif

        // Pick an available buffer
        MPProcessPipelineBuffer *output_buffer = NULL;
        for (size_t i = 0; i < NUM_BUFFERS; ++i) {
                if (output_buffers[i].refcount == 0) {
                        output_buffer = &output_buffers[i];
                }
        }

        if (output_buffer == NULL) {
                return NULL;
        }
        assert(output_buffer != NULL);

#ifdef RENDERDOC
        if (rdoc_api) {
                rdoc_api->StartFrameCapture(NULL, NULL);
        }
#endif

        // Copy image to a GL texture. TODO: This can be avoided
        GLuint input_texture;
        glGenTextures(1, &input_texture);
        glBindTexture(GL_TEXTURE_2D, input_texture);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        glTexImage2D(
                GL_TEXTURE_2D,
                0,
                GL_LUMINANCE,
                libmegapixels_mode_width_to_bytes(state_proc.mode->format,
                                                  state_proc.mode->width) +
                        libmegapixels_mode_width_to_padding(state_proc.mode->format,
                                                            state_proc.mode->width),
                state_proc.mode->height,
                0,
                GL_LUMINANCE,
                GL_UNSIGNED_BYTE,
                image);
        check_gl();

        gles2_debayer_process(
                gles2_debayer, output_buffer->texture_id, input_texture);
        check_gl();

        glFinish();

        glDeleteTextures(1, &input_texture);

#ifdef PROFILE_DEBAYER
        clock_t t2 = clock();
        printf("process_image_for_preview %fms\n",
               (float)(t2 - t1) / CLOCKS_PER_SEC * 1000);
#endif

#ifdef RENDERDOC
        if (rdoc_api) {
                rdoc_api->EndFrameCapture(NULL, NULL);
        }
#endif

        mp_process_pipeline_buffer_ref(output_buffer);
        mp_main_set_preview(output_buffer);

        if (!state_proc.exposure.manual && state_proc.exposure.auto_control == 0) {
                int width = output_buffer_width / 3;
                int height = output_buffer_height / 3;
                uint32_t *center = g_malloc_n(width * height * sizeof(uint32_t), 1);
                glReadPixels(width,
                             height,
                             width,
                             height,
                             GL_RGBA,
                             GL_UNSIGNED_BYTE,
                             center);
                libmegapixels_aaa_software_statistics(
                        center, width, height, &state_proc.stats);
        }

        // Create a thumbnail from the preview for the last capture
        GdkTexture *thumb = NULL;
        if (state_proc.captures_remaining == 1) {
                printf("Making thumbnail\n");

                size_t size = output_buffer_width * output_buffer_height *
                              sizeof(uint32_t);

                uint32_t *data = g_malloc_n(size, 1);

                glReadPixels(0,
                             0,
                             output_buffer_width,
                             output_buffer_height,
                             GL_RGBA,
                             GL_UNSIGNED_BYTE,
                             data);
                check_gl();

                // Flip vertically
                for (size_t y = 0; y < output_buffer_height / 2; ++y) {
                        for (size_t x = 0; x < output_buffer_width; ++x) {
                                uint32_t tmp = data[(output_buffer_height - y - 1) *
                                                            output_buffer_width +
                                                    x];
                                data[(output_buffer_height - y - 1) *
                                             output_buffer_width +
                                     x] = data[y * output_buffer_width + x];
                                data[y * output_buffer_width + x] = tmp;
                        }
                }

                thumb = gdk_memory_texture_new(output_buffer_width,
                                               output_buffer_height,
                                               GDK_MEMORY_R8G8B8A8,
                                               g_bytes_new_take(data, size),
                                               output_buffer_width *
                                                       sizeof(uint32_t));
        }

        return thumb;
}

static void
process_image_for_capture(const uint8_t *image, int count)
{
        time_t rawtime;
        time(&rawtime);
        struct tm tim = *(localtime(&rawtime));

        char datetime[20] = { 0 };
        strftime(datetime, 20, "%Y:%m:%d %H:%M:%S", &tim);

        char fname[255];
        sprintf(fname, "%s/%d.dng", burst_dir, count);

        TIFF *tif = TIFFOpen(fname, "w");
        if (!tif) {
                printf("Could not open tiff\n");
        }

        // Define TIFF thumbnail
        TIFFSetField(tif, TIFFTAG_SUBFILETYPE, 1);
        TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, state_proc.mode->width >> 4);
        TIFFSetField(tif, TIFFTAG_IMAGELENGTH, state_proc.mode->height >> 4);
        TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
        TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
        TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
        TIFFSetField(tif, TIFFTAG_MAKE, state_proc.configuration->make);
        TIFFSetField(tif, TIFFTAG_MODEL, state_proc.configuration->model);

        uint16_t orientation;
        if (state_proc.device_rotation == 0) {
                orientation = state_proc.mode->mirrored ? ORIENTATION_TOPRIGHT :
                                                          ORIENTATION_TOPLEFT;
        } else if (state_proc.device_rotation == 90) {
                orientation = state_proc.mode->mirrored ? ORIENTATION_RIGHTBOT :
                                                          ORIENTATION_LEFTBOT;
        } else if (state_proc.device_rotation == 180) {
                orientation = state_proc.mode->mirrored ? ORIENTATION_BOTLEFT :
                                                          ORIENTATION_BOTRIGHT;
        } else {
                orientation = state_proc.mode->mirrored ? ORIENTATION_LEFTTOP :
                                                          ORIENTATION_RIGHTTOP;
        }
        TIFFSetField(tif, TIFFTAG_ORIENTATION, orientation);
        TIFFSetField(tif, TIFFTAG_DATETIME, datetime);
        TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 3);
        TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
        TIFFSetField(tif, TIFFTAG_SOFTWARE, "Megapixels");
        long sub_offset = 0;
        TIFFSetField(tif, TIFFTAG_SUBIFD, 1, &sub_offset);
        TIFFSetField(tif, TIFFTAG_DNGVERSION, "\001\001\0\0");
        TIFFSetField(tif, TIFFTAG_DNGBACKWARDVERSION, "\001\0\0\0");
        char uniquecameramodel[255];
        sprintf(uniquecameramodel,
                "%s %s",
                state_proc.configuration->make,
                state_proc.configuration->model);
        TIFFSetField(tif, TIFFTAG_UNIQUECAMERAMODEL, uniquecameramodel);

        static const float neutral[] = { 1.0, 1.0, 1.0 };
        TIFFSetField(tif, TIFFTAG_ASSHOTNEUTRAL, 3, neutral);
        TIFFSetField(tif, TIFFTAG_ANALOGBALANCE, 3, state_proc.balance);

        // Write black thumbnail, only windows uses this
        {
                unsigned char *buf = (unsigned char *)calloc(
                        1, (state_proc.mode->width >> 4) * 3);
                for (int row = 0; row < (state_proc.mode->height >> 4); row++) {
                        TIFFWriteScanline(tif, buf, row, 0);
                }
                free(buf);
        }
        TIFFWriteDirectory(tif);

        // Define main photo
        TIFFSetField(tif, TIFFTAG_SUBFILETYPE, 0);
        TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, state_proc.mode->width);
        TIFFSetField(tif, TIFFTAG_IMAGELENGTH, state_proc.mode->height);
        TIFFSetField(tif,
                     TIFFTAG_BITSPERSAMPLE,
                     libmegapixels_format_bits_per_pixel(state_proc.mode->format));
        TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_CFA);
        TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
        TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
        static const short cfapatterndim[] = { 2, 2 };
        TIFFSetField(tif, TIFFTAG_CFAREPEATPATTERNDIM, cfapatterndim);
#if (TIFFLIB_VERSION < 20201219) && !LIBTIFF_CFA_PATTERN
        TIFFSetField(tif,
                     TIFFTAG_CFAPATTERN,
                     mp_pixel_format_cfa_pattern(mode.pixel_format));
#else
        TIFFSetField(tif,
                     TIFFTAG_CFAPATTERN,
                     4,
                     libmegapixels_format_cfa_pattern(state_proc.mode->format));
#endif
        printf("TIFF version %d\n", TIFFLIB_VERSION);
        int whitelevel =
                (1 << libmegapixels_format_bits_per_pixel(state_proc.mode->format)) -
                1;
        TIFFSetField(tif, TIFFTAG_WHITELEVEL, 1, &whitelevel);
        TIFFCheckpointDirectory(tif);
        printf("Writing frame to %s\n", fname);

        uint8_t *output_image = (uint8_t *)image;

        // Repack 10-bit image from sensor format into a sequencial format
        if (libmegapixels_format_bits_per_pixel(state_proc.mode->format) == 10) {
                output_image = malloc(
                        libmegapixels_mode_width_to_bytes(state_proc.mode->format,
                                                          state_proc.mode->width) *
                        state_proc.mode->height);

                repack_image_sequencial(image, output_image, state_proc.mode);
        }

        for (int row = 0; row < state_proc.mode->height; row++) {
                TIFFWriteScanline(tif,
                                  (void *)output_image +
                                          (row * libmegapixels_mode_width_to_bytes(
                                                         state_proc.mode->format,
                                                         state_proc.mode->width)),
                                  row,
                                  0);
        }
        TIFFWriteDirectory(tif);

        if (output_image != image)
                free(output_image);

        // Add an EXIF block to the tiff
        TIFFCreateEXIFDirectory(tif);
        // 1 = manual, 2 = full auto, 3 = aperture priority, 4 = shutter priority
        if (!state_proc.exposure.manual) {
                TIFFSetField(tif, EXIFTAG_EXPOSUREPROGRAM, 2);
        } else {
                TIFFSetField(tif, EXIFTAG_EXPOSUREPROGRAM, 1);
        }

        /*
        TIFFSetField(tif,
                     EXIFTAG_EXPOSURETIME,
                     (mode.frame_interval.numerator /
                      (float)mode.frame_interval.denominator) /
                             ((float)mode.height / (float)exposure));

        if (pr_camera->iso_min && pr_camera->iso_max) {
                uint16_t isospeed = remap(
                        gain - 1, 0, gain_max, pr_camera->iso_min,
        pr_camera->iso_max); TIFFSetField(tif, EXIFTAG_ISOSPEEDRATINGS, 1,
        &isospeed);
        }
        if (!pr_camera->has_flash) {
                // No flash function
                TIFFSetField(tif, EXIFTAG_FLASH, 0x20);
        } else if (flash_enabled) {
                // Flash present and fired
                TIFFSetField(tif, EXIFTAG_FLASH, 0x1);
        } else {
                // Flash present but not fired
                TIFFSetField(tif, EXIFTAG_FLASH, 0x0);
        }
         */

        TIFFSetField(tif, EXIFTAG_DATETIMEORIGINAL, datetime);
        TIFFSetField(tif, EXIFTAG_DATETIMEDIGITIZED, datetime);
        /*
        if (pr_camera->fnumber) {
                TIFFSetField(tif, EXIFTAG_FNUMBER, pr_camera->fnumber);
        }
        if (pr_camera->focallength) {
                TIFFSetField(tif, EXIFTAG_FOCALLENGTH, pr_camera->focallength);
        }
        if (pr_camera->focallength && pr_camera->cropfactor) {
                TIFFSetField(tif,
                             EXIFTAG_FOCALLENGTHIN35MMFILM,
                             (short)(pr_camera->focallength *
        pr_camera->cropfactor));
        }
         */
        uint64_t exif_offset = 0;
        TIFFWriteCustomDirectory(tif, &exif_offset);
        TIFFFreeDirectory(tif);

        // Update exif pointer
        TIFFSetDirectory(tif, 0);
        TIFFSetField(tif, TIFFTAG_EXIFIFD, exif_offset);
        TIFFRewriteDirectory(tif);

        TIFFClose(tif);
}

static void
post_process_finished(GSubprocess *proc, GAsyncResult *res, GdkTexture *thumb)
{
        char *stdout;
        g_subprocess_communicate_utf8_finish(proc, res, &stdout, NULL, NULL);

        // The last line contains the file name
        int end = strlen(stdout);
        // Skip the newline at the end
        stdout[--end] = '\0';

        char *path = path = stdout + end - 1;
        do {
                if (*path == '\n') {
                        path++;
                        break;
                }
                --path;
        } while (path > stdout);

        mp_main_capture_completed(thumb, path);
}

static void
process_capture_burst(GdkTexture *thumb)
{
        time_t rawtime;
        time(&rawtime);
        struct tm tim = *(localtime(&rawtime));

        char timestamp[30];
        strftime(timestamp, 30, "%Y%m%d%H%M%S", &tim);

        if (g_get_user_special_dir(G_USER_DIRECTORY_PICTURES) != NULL) {
                sprintf(capture_fname,
                        "%s/IMG%s",
                        g_get_user_special_dir(G_USER_DIRECTORY_PICTURES),
                        timestamp);
        } else if (getenv("XDG_PICTURES_DIR") != NULL) {
                sprintf(capture_fname,
                        "%s/IMG%s",
                        getenv("XDG_PICTURES_DIR"),
                        timestamp);
        } else {
                sprintf(capture_fname,
                        "%s/Pictures/IMG%s",
                        getenv("HOME"),
                        timestamp);
        }

        bool save_dng = g_settings_get_boolean(settings, "save-raw");
        char *postprocessor = g_settings_get_string(settings, "postprocessor");

        char save_dng_s[2] = "0";
        if (save_dng) {
                save_dng_s[0] = '1';
        }

        // Start post-processing the captured burst
        g_print("Post process %s to %s.ext (save-dng %s)\n",
                burst_dir,
                capture_fname,
                save_dng_s);
        g_autoptr(GError) error = NULL;
        GSubprocess *proc = g_subprocess_new(G_SUBPROCESS_FLAGS_STDOUT_PIPE,
                                             &error,
                                             postprocessor,
                                             burst_dir,
                                             capture_fname,
                                             save_dng_s,
                                             NULL);

        if (!proc) {
                g_printerr("Failed to spawn postprocess process: %s\n",
                           error->message);
                return;
        }

        g_subprocess_communicate_utf8_async(
                proc, NULL, NULL, (GAsyncReadyCallback)post_process_finished, thumb);
}

static void
process_image(MPPipeline *pipeline, const MPBuffer *buffer)
{
#ifdef PROFILE_PROCESS
        clock_t t1 = clock();
#endif

        size_t size = (libmegapixels_mode_width_to_bytes(state_proc.mode->format,
                                                         state_proc.mode->width) +
                       libmegapixels_mode_width_to_padding(state_proc.mode->format,
                                                           state_proc.mode->width)) *
                      state_proc.mode->height;
        uint8_t *image = malloc(size);
        memcpy(image, buffer->data, size);
        mp_io_pipeline_release_buffer(buffer->index);

        MPZBarImage *zbar_image = mp_zbar_image_new(image,
                                                    state_proc.mode->format,
                                                    state_proc.mode->width,
                                                    state_proc.mode->height,
                                                    state_proc.device_rotation,
                                                    state_proc.mode->mirrored);
        mp_zbar_pipeline_process_image(mp_zbar_image_ref(zbar_image));

#ifdef PROFILE_PROCESS
        clock_t t2 = clock();
#endif

        GdkTexture *thumb = process_image_for_preview(image);

        if (state_proc.captures_remaining > 0) {
                --state_proc.captures_remaining;

                process_image_for_capture(image, state_proc.counter++);

                if (state_proc.captures_remaining == 0) {
                        assert(thumb);
                        process_capture_burst(thumb);
                } else {
                        assert(!thumb);
                }
        } else {
                assert(!thumb);
        }

        mp_zbar_image_unref(zbar_image);

        ++frames_processed;
        if (state_proc.captures_remaining == 0) {
                is_capturing = false;
        }

#ifdef PROFILE_PROCESS
        clock_t t3 = clock();
        printf("process_image %fms, step 1:%fms, step 2:%fms\n",
               (float)(t3 - t1) / CLOCKS_PER_SEC * 1000,
               (float)(t2 - t1) / CLOCKS_PER_SEC * 1000,
               (float)(t3 - t2) / CLOCKS_PER_SEC * 1000);
#endif
}

void
mp_process_pipeline_process_image(MPBuffer buffer)
{
        // If we haven't processed the previous frame yet, drop this one
        if (frames_received != frames_processed && !is_capturing) {
                mp_io_pipeline_release_buffer(buffer.index);
                return;
        }

        ++frames_received;

        mp_pipeline_invoke(pipeline,
                           (MPPipelineCallback)process_image,
                           &buffer,
                           sizeof(MPBuffer));
}

static void
capture()
{
        char template[] = "/tmp/megapixels.XXXXXX";
        char *tempdir;
        tempdir = mkdtemp(template);

        if (tempdir == NULL) {
                g_printerr("Could not make capture directory %s\n", template);
                exit(EXIT_FAILURE);
        }

        strcpy(burst_dir, tempdir);

        state_proc.captures_remaining = state_proc.burst_length;
        state_proc.counter = 0;
}

void
mp_process_pipeline_capture()
{
        is_capturing = true;

        mp_pipeline_invoke(pipeline, capture, NULL, 0);
}

static void
on_output_changed(bool format_changed)
{
        output_buffer_width = state_proc.mode->width / 2;
        output_buffer_height = state_proc.mode->height / 2;

        if (state_proc.mode->rotation != 0 && state_proc.mode->rotation != 180) {
                int tmp = output_buffer_width;
                output_buffer_width = output_buffer_height;
                output_buffer_height = tmp;
        }

        for (size_t i = 0; i < NUM_BUFFERS; ++i) {
                glBindTexture(GL_TEXTURE_2D, output_buffers[i].texture_id);
                glTexImage2D(GL_TEXTURE_2D,
                             0,
                             GL_RGBA,
                             output_buffer_width,
                             output_buffer_height,
                             0,
                             GL_RGBA,
                             GL_UNSIGNED_BYTE,
                             NULL);
        }

        glBindTexture(GL_TEXTURE_2D, 0);

        // Create new gles2_debayer on format change
        if (format_changed) {
                if (gles2_debayer)
                        gles2_debayer_free(gles2_debayer);

                gles2_debayer = gles2_debayer_new(state_proc.mode->format);
                check_gl();

                gles2_debayer_use(gles2_debayer);
        }

        gles2_debayer_configure(gles2_debayer,
                                output_buffer_width,
                                output_buffer_height,
                                state_proc.mode->width,
                                state_proc.mode->height,
                                state_proc.mode->rotation,
                                0,
                                state_proc.calibration);
}

static int
mod(int a, int b)
{
        int r = a % b;
        return r < 0 ? r + b : r;
}

static void
update_state(MPPipeline *pipeline, const mp_state_proc *new_state)
{
        bool camera_changed = state_proc.camera != new_state->camera;
        state_proc.configuration = new_state->configuration;
        state_proc.camera = new_state->camera;

        state_proc.gain.control = new_state->gain.control;
        state_proc.gain.auto_control = new_state->gain.auto_control;
        state_proc.gain.value = new_state->gain.value;
        state_proc.gain.max = new_state->gain.max;
        state_proc.gain.manual = new_state->gain.manual;

        state_proc.exposure.control = new_state->exposure.control;
        state_proc.exposure.auto_control = new_state->exposure.auto_control;
        state_proc.exposure.value = new_state->exposure.value;
        state_proc.exposure.max = new_state->exposure.max;
        state_proc.exposure.manual = new_state->exposure.manual;

        state_proc.focus.control = new_state->focus.control;
        state_proc.focus.auto_control = new_state->focus.auto_control;
        state_proc.focus.value = new_state->focus.value;
        state_proc.focus.max = new_state->focus.max;
        state_proc.focus.manual = new_state->focus.manual;

        const bool output_changed =
                !libmegapixels_mode_equals(state_proc.mode,
                                           new_state->camera->current_mode) ||
                state_proc.preview_width != new_state->preview_width ||
                state_proc.preview_height != new_state->preview_height ||
                state_proc.device_rotation != new_state->device_rotation;

        bool format_changed = state_proc.mode == NULL;

        if (!format_changed && state_proc.mode->v4l_pixfmt !=
                                       new_state->camera->current_mode->v4l_pixfmt) {
                format_changed = true;
        }

        state_proc.mode = new_state->camera->current_mode;

        state_proc.preview_width = new_state->preview_width;
        state_proc.preview_height = new_state->preview_height;

        state_proc.device_rotation = new_state->device_rotation;
        state_proc.burst_length = new_state->burst_length;

        state_proc.balance[0] = new_state->balance[0];
        state_proc.balance[1] = new_state->balance[1];
        state_proc.balance[2] = new_state->balance[2];

        if (output_changed) {
                state_proc.camera_rotation = mod(
                        state_proc.mode->rotation - state_proc.device_rotation, 360);

                on_output_changed(format_changed);
        }

        if (camera_changed) {
                char cf[PATH_MAX];
                if (find_calibration(cf, state_proc.camera->name)) {
                        state_proc.calibration = parse_calibration_file(cf);
                } else {
                        printf("No calibration for %s\n", state_proc.camera->name);
                }
        }

        mp_state_main new_main = {
                .camera = pr_camera,
                .has_auto_focus_continuous = false,
                .has_auto_focus_start = false,
                .preview_buffer_width = output_buffer_width,
                .preview_buffer_height = output_buffer_height,
                .control_flash = false,

                .gain.control = state_proc.gain.control,
                .gain.auto_control = state_proc.gain.auto_control,
                .gain.value = state_proc.gain.value,
                .gain.max = state_proc.gain.max,
                .gain.manual = state_proc.gain.manual,

                .exposure.control = state_proc.exposure.control,
                .exposure.auto_control = state_proc.exposure.auto_control,
                .exposure.value = state_proc.exposure.value,
                .exposure.max = state_proc.exposure.max,
                .exposure.manual = state_proc.exposure.manual,

                .focus.control = state_proc.focus.control,
                .focus.auto_control = state_proc.focus.auto_control,
                .focus.value = state_proc.focus.value,
                .focus.max = state_proc.focus.max,
                .focus.manual = state_proc.focus.manual,

                .stats.exposure = state_proc.stats.exposure,
                .stats.whitebalance = state_proc.stats.whitebalance,
                .stats.focus = state_proc.stats.focus,
        };
        mp_main_update_state(&new_main);
}

void
mp_process_pipeline_update_state(const mp_state_proc *new_state)
{
        mp_pipeline_invoke(pipeline,
                           (MPPipelineCallback)update_state,
                           new_state,
                           sizeof(mp_state_proc));
}

// GTK4 seems to require this
void
pango_fc_font_get_languages()
{
}