2015-04-25 22:58:57 +00:00
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/*
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* Vidvox Hap decoder
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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 decoder
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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 "libavutil/imgutils.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 "snappy.h"
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#include "texturedsp.h"
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#include "thread.h"
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/* The first three bytes are the size of the section past the header, or zero
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* if the length is stored in the next long word. The fourth byte in the first
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* long word indicates the type of the current section. */
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static int parse_section_header(AVCodecContext *avctx)
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{
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HapContext *ctx = avctx->priv_data;
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GetByteContext *gbc = &ctx->gbc;
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int length;
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if (bytestream2_get_bytes_left(gbc) < 4)
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return AVERROR_INVALIDDATA;
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length = bytestream2_get_le24(gbc);
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ctx->section_type = bytestream2_get_byte(gbc);
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if (length == 0) {
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if (bytestream2_get_bytes_left(gbc) < 4)
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return AVERROR_INVALIDDATA;
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length = bytestream2_get_le32(gbc);
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}
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if (length > bytestream2_get_bytes_left(gbc) || length == 0)
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return AVERROR_INVALIDDATA;
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return length;
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}
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/* Prepare the texture to be decompressed */
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static int setup_texture(AVCodecContext *avctx, size_t length)
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{
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HapContext *ctx = avctx->priv_data;
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GetByteContext *gbc = &ctx->gbc;
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int64_t snappy_size;
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const char *texture_name;
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const char *compressorstr;
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int ret;
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switch (ctx->section_type & 0x0F) {
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case HAP_FMT_RGBDXT1:
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ctx->tex_rat = 8;
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ctx->tex_fun = ctx->dxtc.dxt1_block;
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texture_name = "DXT1";
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break;
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case HAP_FMT_RGBADXT5:
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ctx->tex_rat = 16;
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ctx->tex_fun = ctx->dxtc.dxt5_block;
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texture_name = "DXT5";
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break;
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case HAP_FMT_YCOCGDXT5:
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ctx->tex_rat = 16;
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ctx->tex_fun = ctx->dxtc.dxt5ys_block;
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texture_name = "DXT5-YCoCg-scaled";
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break;
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default:
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av_log(avctx, AV_LOG_ERROR,
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"Invalid format mode %02X.\n", ctx->section_type);
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return AVERROR_INVALIDDATA;
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}
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switch (ctx->section_type & 0xF0) {
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case HAP_COMP_NONE:
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/* Only DXTC texture compression */
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ctx->tex_data = gbc->buffer;
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ctx->tex_size = length;
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compressorstr = "none";
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break;
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case HAP_COMP_SNAPPY:
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/* Uncompress the frame */
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ret = ff_snappy_uncompress(gbc, &ctx->snappied, &snappy_size);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Snappy uncompress error\n");
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return ret;
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}
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ctx->tex_data = ctx->snappied;
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ctx->tex_size = snappy_size;
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compressorstr = "snappy";
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break;
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case HAP_COMP_COMPLEX:
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compressorstr = "complex";
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avpriv_request_sample(avctx, "Complex Hap compressor");
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return AVERROR_PATCHWELCOME;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR,
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"Invalid compressor mode %02X.\n", ctx->section_type);
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return AVERROR_INVALIDDATA;
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}
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av_log(avctx, AV_LOG_DEBUG, "%s texture with %s compressor\n",
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texture_name, compressorstr);
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return 0;
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}
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static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
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2015-07-17 01:07:07 +00:00
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int slice, int thread_nb)
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2015-04-25 22:58:57 +00:00
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{
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HapContext *ctx = avctx->priv_data;
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AVFrame *frame = arg;
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2015-07-17 01:07:07 +00:00
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const uint8_t *d = ctx->tex_data;
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int w_block = avctx->coded_width / TEXTURE_BLOCK_W;
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2015-07-22 23:01:01 +00:00
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int h_block = avctx->coded_height / TEXTURE_BLOCK_H;
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2015-07-17 01:07:07 +00:00
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int x, y;
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int start_slice, end_slice;
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2015-07-22 23:01:01 +00:00
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int base_blocks_per_slice = h_block / ctx->slice_count;
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int remainder_blocks = h_block % ctx->slice_count;
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2015-07-17 01:07:07 +00:00
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2015-07-22 23:01:01 +00:00
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/* When the frame height (in blocks) doesn't divide evenly between the
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* number of slices, spread the remaining blocks evenly between the first
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* operations */
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start_slice = slice * base_blocks_per_slice;
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/* Add any extra blocks (one per slice) that have been added before this slice */
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start_slice += FFMIN(slice, remainder_blocks);
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2015-07-17 01:07:07 +00:00
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2015-07-22 23:01:01 +00:00
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end_slice = start_slice + base_blocks_per_slice;
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/* Add an extra block if there are still remainder blocks to be accounted for */
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if (slice < remainder_blocks)
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end_slice++;
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2015-07-17 01:07:07 +00:00
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for (y = start_slice; y < end_slice; y++) {
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uint8_t *p = frame->data[0] + y * frame->linesize[0] * TEXTURE_BLOCK_H;
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int off = y * w_block;
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for (x = 0; x < w_block; x++) {
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ctx->tex_fun(p + x * 16, frame->linesize[0],
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d + (off + x) * ctx->tex_rat);
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}
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}
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2015-04-25 22:58:57 +00:00
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return 0;
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}
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static int hap_decode(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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HapContext *ctx = avctx->priv_data;
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ThreadFrame tframe;
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int ret, length;
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bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
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/* Check for section header */
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length = parse_section_header(avctx);
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if (length < 0) {
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av_log(avctx, AV_LOG_ERROR, "Frame is too small.\n");
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return length;
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}
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/* Prepare the texture buffer and decompress function */
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ret = setup_texture(avctx, length);
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if (ret < 0)
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return ret;
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/* Get the output frame ready to receive data */
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tframe.f = data;
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ret = ff_thread_get_buffer(avctx, &tframe, 0);
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if (ret < 0)
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return ret;
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ff_thread_finish_setup(avctx);
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/* Use the decompress function on the texture, one block per thread */
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2015-07-22 23:01:01 +00:00
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avctx->execute2(avctx, decompress_texture_thread, tframe.f, NULL, ctx->slice_count);
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2015-04-25 22:58:57 +00:00
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/* Frame is ready to be output */
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tframe.f->pict_type = AV_PICTURE_TYPE_I;
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tframe.f->key_frame = 1;
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*got_frame = 1;
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return avpkt->size;
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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 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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/* Since codec is based on 4x4 blocks, size is aligned to 4 */
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avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
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avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
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/* Technically only one mode has alpha, but 32 bits are easier to handle */
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avctx->pix_fmt = AV_PIX_FMT_RGBA;
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ff_texturedsp_init(&ctx->dxtc);
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2015-07-22 23:01:01 +00:00
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ctx->slice_count = av_clip(avctx->thread_count, 1,
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avctx->coded_height / TEXTURE_BLOCK_H);
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2015-04-25 22:58:57 +00:00
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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->snappied);
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return 0;
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}
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AVCodec ff_hap_decoder = {
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.name = "hap",
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.long_name = NULL_IF_CONFIG_SMALL("Vidvox Hap decoder"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_HAP,
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.init = hap_init,
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.decode = hap_decode,
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.close = hap_close,
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.priv_data_size = sizeof(HapContext),
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.capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS |
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CODEC_CAP_DR1,
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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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