view x265_glue.c @ 26:a6e11adda0be

The format of JPEG EXIF data converted to BPG had an extraneous zero byte at front .. this is probably not intentional. Fixed. Programs reading BPG files may wish to compensate by checking for 0 before the "II" "TIFF" EXIF header.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 10 May 2017 14:26:20 +0300
parents 772086c29cc7
children 33594243ce31
line wrap: on
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/*
 * x265 encoder front-end  
 *
 * Copyright (c) 2014 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>

#include "bpgenc.h"

#include "x265.h"

struct HEVCEncoderContext {
    const x265_api *api;
    x265_encoder *enc;
    x265_picture *pic;
    uint8_t *buf;
    int buf_len, buf_size;
};

static HEVCEncoderContext *x265_open(const HEVCEncodeParams *params)
{
    HEVCEncoderContext *s;
    x265_param *p;
    int preset_index;
    const char *preset;
    
    s = malloc(sizeof(HEVCEncoderContext));
    memset(s, 0, sizeof(*s));

    s->api = x265_api_get(params->bit_depth);
    if (!s->api) {
        fprintf(stderr, "x265 supports bit depths of 8, 10 or 12.\n");
        return NULL;
    }
#if 0
    /* Note: the x265 library included in libbpg supported gray encoding */
    if (params->chroma_format == BPG_FORMAT_GRAY) {
        fprintf(stderr, "x265 does not support monochrome (or alpha) data yet. Plase use the jctvc encoder.\n");
        return NULL;
    }
#endif
    
    p = s->api->param_alloc();

    preset_index = params->compress_level; /* 9 is placebo */

    preset = x265_preset_names[preset_index];
    if (params->verbose)
        printf("Using x265 preset: %s\n", preset);
    
    s->api->param_default_preset(p, preset, "ssim");

    p->bRepeatHeaders = 1;
    p->decodedPictureHashSEI = params->sei_decoded_picture_hash;
    p->sourceWidth = params->width;
    p->sourceHeight = params->height;
    switch(params->chroma_format) {
    case BPG_FORMAT_GRAY:
        p->internalCsp = X265_CSP_I400;
        break;
    case BPG_FORMAT_420:
        p->internalCsp = X265_CSP_I420;
        break;
    case BPG_FORMAT_422:
        p->internalCsp = X265_CSP_I422;
        break;
    case BPG_FORMAT_444:
        p->internalCsp = X265_CSP_I444;
        break;
    default:
        abort();
    }
    if (params->intra_only) {
        p->keyframeMax = 1; /* only I frames */
        p->totalFrames = 1;
    } else {
        p->keyframeMax = 250;
        p->totalFrames = 0;
        p->maxNumReferences = 1;
        p->bframes = 0;
    }
    p->bEnableRectInter = 1;
    p->bEnableAMP = 1; /* cannot use 0 due to header restriction */
    p->internalBitDepth = params->bit_depth;
    p->bEmitInfoSEI = 0;
    if (params->verbose)
        p->logLevel = X265_LOG_INFO;
    else
        p->logLevel = X265_LOG_NONE;
        
    /* dummy frame rate */
    p->fpsNum = 25;
    p->fpsDenom = 1;

    p->rc.rateControlMode = X265_RC_CQP;
    p->rc.qp = params->qp;
    p->bLossless = params->lossless;

    s->enc = s->api->encoder_open(p);

    s->pic = s->api->picture_alloc();
    s->api->picture_init(p, s->pic);

    s->pic->colorSpace = p->internalCsp;

    s->api->param_free(p);

    return s;
}

static void add_nal(HEVCEncoderContext *s, const uint8_t *data, int data_len)
{
    int new_size, size;

    size = s->buf_len + data_len;
    if (size > s->buf_size) {
        new_size = (s->buf_size * 3) / 2;
        if (new_size < size)
            new_size = size;
        s->buf = realloc(s->buf, new_size);
        s->buf_size = new_size;
    }
    memcpy(s->buf + s->buf_len, data, data_len);
    s->buf_len += data_len;
}

static int x265_encode(HEVCEncoderContext *s, Image *img)
{
    int c_count, i, ret;
    x265_picture *pic;
    uint32_t nal_count;
    x265_nal *p_nal;
    
    pic = s->pic;

    if (img->format == BPG_FORMAT_GRAY)
        c_count = 1;
    else
        c_count = 3;
    for(i = 0; i < c_count; i++) {
        pic->planes[i] = img->data[i];
        pic->stride[i] = img->linesize[i];
    }
    pic->bitDepth = img->bit_depth;

    ret = s->api->encoder_encode(s->enc, &p_nal, &nal_count, pic, NULL);
    if (ret > 0) {
        for(i = 0; i < nal_count; i++) {
            add_nal(s, p_nal[i].payload, p_nal[i].sizeBytes);
        }
    }
    return 0;
}

static int x265_close(HEVCEncoderContext *s, uint8_t **pbuf)
{
    int buf_len, ret, i;
    uint32_t nal_count;
    x265_nal *p_nal;
    
    /* get last compressed pictures */
    for(;;) {
        ret = s->api->encoder_encode(s->enc, &p_nal, &nal_count, NULL, NULL);
        if (ret <= 0)
            break;
        for(i = 0; i < nal_count; i++) {
            add_nal(s, p_nal[i].payload, p_nal[i].sizeBytes);
        }
    }

    if (s->buf_len < s->buf_size) {
        s->buf = realloc(s->buf, s->buf_len);
    }

    *pbuf = s->buf;
    buf_len = s->buf_len;

    s->api->encoder_close(s->enc);
    s->api->picture_free(s->pic);
    free(s);
    return buf_len;
}

HEVCEncoder x265_hevc_encoder = {
  .open = x265_open,
  .encode = x265_encode,
  .close = x265_close,
};