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/*
* Vidvox Hap encoder
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Hap encoder
*
* Fourcc: Hap1, Hap5, HapY
*
* https://github.com/Vidvox/hap/blob/master/documentation/HapVideoDRAFT.md
*/
#include <stdint.h>
#include "snappy-c.h"
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "hap.h"
#include "internal.h"
#include "texturedsp.h"
/* A fixed header size allows to skip a memcpy */
#define HEADER_SIZE 8
static void compress_texture(AVCodecContext *avctx, const AVFrame *f)
{
HapContext *ctx = avctx->priv_data;
uint8_t *out = ctx->tex_buf;
int i, j;
for (j = 0; j < avctx->height; j += 4) {
for (i = 0; i < avctx->width; i += 4) {
uint8_t *p = f->data[0] + i * 4 + j * f->linesize[0];
const int step = ctx->tex_fun(out, f->linesize[0], p);
out += step;
}
}
}
static int hap_encode(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *frame, int *got_packet)
{
HapContext *ctx = avctx->priv_data;
size_t final_size = ctx->max_snappy;
int ret, comp = HAP_COMP_SNAPPY;
int pktsize = FFMAX(ctx->tex_size, ctx->max_snappy) + HEADER_SIZE;
/* Allocate maximum size packet, shrink later. */
ret = ff_alloc_packet(pkt, pktsize);
if (ret < 0)
return ret;
/* DXTC compression. */
compress_texture(avctx, frame);
/* Compress with snappy too, write directly on packet buffer. */
ret = snappy_compress(ctx->tex_buf, ctx->tex_size,
pkt->data + HEADER_SIZE, &final_size);
if (ret != SNAPPY_OK) {
av_log(avctx, AV_LOG_ERROR, "Snappy compress error.\n");
return AVERROR_BUG;
}
/* If there is no gain from snappy, just use the raw texture. */
if (final_size > ctx->tex_size) {
comp = HAP_COMP_NONE;
av_log(avctx, AV_LOG_VERBOSE,
"Snappy buffer bigger than uncompressed (%lu > %lu bytes).\n",
final_size, ctx->tex_size);
memcpy(pkt->data + HEADER_SIZE, ctx->tex_buf, ctx->tex_size);
final_size = ctx->tex_size;
}
/* Write header at the start. */
AV_WL24(pkt->data, 0);
AV_WL32(pkt->data + 4, final_size);
pkt->data[3] = comp | ctx->section_type;
av_shrink_packet(pkt, final_size + HEADER_SIZE);
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
static av_cold int hap_init(AVCodecContext *avctx)
{
HapContext *ctx = avctx->priv_data;
int ratio;
int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid video size %dx%d.\n",
avctx->width, avctx->height);
return ret;
}
if (avctx->width % 4 || avctx->height % 4) {
av_log(avctx, AV_LOG_ERROR, "Video size %dx%d is not multiple of 4.\n",
avctx->width, avctx->height);
return AVERROR_INVALIDDATA;
}
ff_texturedspenc_init(&ctx->dxtc);
switch (ctx->section_type & 0x0F) {
case HAP_FMT_RGBDXT1:
ratio = 8;
avctx->codec_tag = MKTAG('H', 'a', 'p', '1');
ctx->tex_fun = ctx->dxtc.dxt1_block;
break;
case HAP_FMT_RGBADXT5:
ratio = 4;
avctx->codec_tag = MKTAG('H', 'a', 'p', '5');
ctx->tex_fun = ctx->dxtc.dxt5_block;
break;
case HAP_FMT_YCOCGDXT5:
ratio = 4;
avctx->codec_tag = MKTAG('H', 'a', 'p', 'Y');
ctx->tex_fun = ctx->dxtc.dxt5ys_block;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid format %02X\n", ctx->section_type);
return AVERROR_INVALIDDATA;
}
/* Texture compression ratio is constant, so can we computer
* beforehand the final size of the uncompressed buffer. */
ctx->tex_size = FFALIGN(avctx->width, TEXTURE_BLOCK_W) *
FFALIGN(avctx->height, TEXTURE_BLOCK_H) * 4 / ratio;
ctx->max_snappy = snappy_max_compressed_length(ctx->tex_size);
ctx->tex_buf = av_malloc(ctx->tex_size);
if (!ctx->tex_buf)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int hap_close(AVCodecContext *avctx)
{
HapContext *ctx = avctx->priv_data;
av_freep(&ctx->tex_buf);
return 0;
}
#define OFFSET(x) offsetof(HapContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "format", NULL, OFFSET(section_type), AV_OPT_TYPE_INT, { .i64 = HAP_FMT_RGBDXT1 }, HAP_FMT_RGBDXT1, HAP_FMT_YCOCGDXT5, FLAGS, "format" },
{ "hap", "Hap 1 (DXT1 textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_RGBDXT1 }, 0, 0, FLAGS, "format" },
{ "hap_alpha", "Hap Alpha (DXT5 textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_RGBADXT5 }, 0, 0, FLAGS, "format" },
{ "hap_q", "Hap Q (DXT5-YCoCg textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_YCOCGDXT5 }, 0, 0, FLAGS, "format" },
{ NULL },
};
static const AVClass hapenc_class = {
.class_name = "Hap encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_hap_encoder = {
.name = "hap",
.long_name = NULL_IF_CONFIG_SMALL("Vidvox Hap encoder"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_HAP,
.priv_data_size = sizeof(HapContext),
.priv_class = &hapenc_class,
.init = hap_init,
.encode2 = hap_encode,
.close = hap_close,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE,
},
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};
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