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