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ffmpeg/libavcodec/hapdec.c

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/*
* Vidvox Hap decoder
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
* Copyright (C) 2015 Tom Butterworth <bangnoise@gmail.com>
*
* HapQA and HAPAlphaOnly added by Jokyo Images
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Hap decoder
*
* Fourcc: Hap1, Hap5, HapY, HapA, HapM
*
* https://github.com/Vidvox/hap/blob/master/documentation/HapVideoDRAFT.md
*/
#include <stdint.h>
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "hap.h"
#include "snappy.h"
#include "texturedsp.h"
#include "thread.h"
static int hap_parse_decode_instructions(HapContext *ctx, int size)
{
GetByteContext *gbc = &ctx->gbc;
int section_size;
enum HapSectionType section_type;
int is_first_table = 1, had_offsets = 0, had_compressors = 0, had_sizes = 0;
int i, ret;
while (size > 0) {
int stream_remaining = bytestream2_get_bytes_left(gbc);
ret = ff_hap_parse_section_header(gbc, &section_size, &section_type);
if (ret != 0)
return ret;
size -= stream_remaining - bytestream2_get_bytes_left(gbc);
switch (section_type) {
case HAP_ST_COMPRESSOR_TABLE:
ret = ff_hap_set_chunk_count(ctx, section_size, is_first_table);
if (ret != 0)
return ret;
for (i = 0; i < section_size; i++) {
ctx->chunks[i].compressor = bytestream2_get_byte(gbc) << 4;
}
had_compressors = 1;
is_first_table = 0;
break;
case HAP_ST_SIZE_TABLE:
ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
if (ret != 0)
return ret;
for (i = 0; i < section_size / 4; i++) {
ctx->chunks[i].compressed_size = bytestream2_get_le32(gbc);
}
had_sizes = 1;
is_first_table = 0;
break;
case HAP_ST_OFFSET_TABLE:
ret = ff_hap_set_chunk_count(ctx, section_size / 4, is_first_table);
if (ret != 0)
return ret;
for (i = 0; i < section_size / 4; i++) {
ctx->chunks[i].compressed_offset = bytestream2_get_le32(gbc);
}
had_offsets = 1;
is_first_table = 0;
break;
default:
break;
}
size -= section_size;
}
if (!had_sizes || !had_compressors)
return AVERROR_INVALIDDATA;
/* The offsets table is optional. If not present than calculate offsets by
* summing the sizes of preceding chunks. */
if (!had_offsets) {
size_t running_size = 0;
for (i = 0; i < ctx->chunk_count; i++) {
ctx->chunks[i].compressed_offset = running_size;
if (ctx->chunks[i].compressed_size > UINT32_MAX - running_size)
return AVERROR_INVALIDDATA;
running_size += ctx->chunks[i].compressed_size;
}
}
return 0;
}
static int hap_can_use_tex_in_place(HapContext *ctx)
{
int i;
size_t running_offset = 0;
for (i = 0; i < ctx->chunk_count; i++) {
if (ctx->chunks[i].compressed_offset != running_offset
|| ctx->chunks[i].compressor != HAP_COMP_NONE)
return 0;
running_offset += ctx->chunks[i].compressed_size;
}
return 1;
}
static int hap_parse_frame_header(AVCodecContext *avctx)
{
HapContext *ctx = avctx->priv_data;
GetByteContext *gbc = &ctx->gbc;
int section_size;
enum HapSectionType section_type;
const char *compressorstr;
int i, ret;
ret = ff_hap_parse_section_header(gbc, &ctx->texture_section_size, &section_type);
if (ret != 0)
return ret;
if ((avctx->codec_tag == MKTAG('H','a','p','1') && (section_type & 0x0F) != HAP_FMT_RGBDXT1) ||
(avctx->codec_tag == MKTAG('H','a','p','5') && (section_type & 0x0F) != HAP_FMT_RGBADXT5) ||
(avctx->codec_tag == MKTAG('H','a','p','Y') && (section_type & 0x0F) != HAP_FMT_YCOCGDXT5) ||
(avctx->codec_tag == MKTAG('H','a','p','A') && (section_type & 0x0F) != HAP_FMT_RGTC1) ||
((avctx->codec_tag == MKTAG('H','a','p','M') && (section_type & 0x0F) != HAP_FMT_RGTC1) &&
(section_type & 0x0F) != HAP_FMT_YCOCGDXT5)) {
av_log(avctx, AV_LOG_ERROR,
"Invalid texture format %#04x.\n", section_type & 0x0F);
return AVERROR_INVALIDDATA;
}
switch (section_type & 0xF0) {
case HAP_COMP_NONE:
case HAP_COMP_SNAPPY:
ret = ff_hap_set_chunk_count(ctx, 1, 1);
if (ret == 0) {
ctx->chunks[0].compressor = section_type & 0xF0;
ctx->chunks[0].compressed_offset = 0;
ctx->chunks[0].compressed_size = ctx->texture_section_size;
}
if (ctx->chunks[0].compressor == HAP_COMP_NONE) {
compressorstr = "none";
} else {
compressorstr = "snappy";
}
break;
case HAP_COMP_COMPLEX:
ret = ff_hap_parse_section_header(gbc, &section_size, &section_type);
if (ret == 0 && section_type != HAP_ST_DECODE_INSTRUCTIONS)
ret = AVERROR_INVALIDDATA;
if (ret == 0)
ret = hap_parse_decode_instructions(ctx, section_size);
compressorstr = "complex";
break;
default:
ret = AVERROR_INVALIDDATA;
break;
}
if (ret != 0)
return ret;
/* Check the frame is valid and read the uncompressed chunk sizes */
ctx->tex_size = 0;
for (i = 0; i < ctx->chunk_count; i++) {
HapChunk *chunk = &ctx->chunks[i];
/* Check the compressed buffer is valid */
if (chunk->compressed_offset + (uint64_t)chunk->compressed_size > bytestream2_get_bytes_left(gbc))
return AVERROR_INVALIDDATA;
/* Chunks are unpacked sequentially, ctx->tex_size is the uncompressed
* size thus far */
chunk->uncompressed_offset = ctx->tex_size;
/* Fill out uncompressed size */
if (chunk->compressor == HAP_COMP_SNAPPY) {
GetByteContext gbc_tmp;
int64_t uncompressed_size;
bytestream2_init(&gbc_tmp, gbc->buffer + chunk->compressed_offset,
chunk->compressed_size);
uncompressed_size = ff_snappy_peek_uncompressed_length(&gbc_tmp);
if (uncompressed_size < 0) {
return uncompressed_size;
}
chunk->uncompressed_size = uncompressed_size;
} else if (chunk->compressor == HAP_COMP_NONE) {
chunk->uncompressed_size = chunk->compressed_size;
} else {
return AVERROR_INVALIDDATA;
}
ctx->tex_size += chunk->uncompressed_size;
}
av_log(avctx, AV_LOG_DEBUG, "%s compressor\n", compressorstr);
return ret;
}
static int decompress_chunks_thread(AVCodecContext *avctx, void *arg,
int chunk_nb, int thread_nb)
{
HapContext *ctx = avctx->priv_data;
HapChunk *chunk = &ctx->chunks[chunk_nb];
GetByteContext gbc;
uint8_t *dst = ctx->tex_buf + chunk->uncompressed_offset;
bytestream2_init(&gbc, ctx->gbc.buffer + chunk->compressed_offset, chunk->compressed_size);
if (chunk->compressor == HAP_COMP_SNAPPY) {
int ret;
int64_t uncompressed_size = ctx->tex_size;
/* Uncompress the frame */
ret = ff_snappy_uncompress(&gbc, dst, &uncompressed_size);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Snappy uncompress error\n");
return ret;
}
} else if (chunk->compressor == HAP_COMP_NONE) {
bytestream2_get_buffer(&gbc, dst, chunk->compressed_size);
}
return 0;
}
static int hap_decode(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
HapContext *ctx = avctx->priv_data;
int ret, i, t;
int section_size;
enum HapSectionType section_type;
int start_texture_section = 0;
bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
/* check for multi texture header */
if (ctx->texture_count == 2) {
ret = ff_hap_parse_section_header(&ctx->gbc, &section_size, &section_type);
if (ret != 0)
return ret;
if ((section_type & 0x0F) != 0x0D) {
av_log(avctx, AV_LOG_ERROR, "Invalid section type in 2 textures mode %#04x.\n", section_type);
return AVERROR_INVALIDDATA;
}
start_texture_section = 4;
}
/* Get the output frame ready to receive data */
ret = ff_thread_get_buffer(avctx, frame, 0);
if (ret < 0)
return ret;
for (t = 0; t < ctx->texture_count; t++) {
bytestream2_seek(&ctx->gbc, start_texture_section, SEEK_SET);
/* Check for section header */
ret = hap_parse_frame_header(avctx);
if (ret < 0)
return ret;
if (ctx->tex_size != (avctx->coded_width / TEXTURE_BLOCK_W)
*(avctx->coded_height / TEXTURE_BLOCK_H)
*ctx->dec[t].tex_ratio) {
av_log(avctx, AV_LOG_ERROR, "uncompressed size mismatches\n");
return AVERROR_INVALIDDATA;
}
start_texture_section += ctx->texture_section_size + 4;
/* Unpack the DXT texture */
if (hap_can_use_tex_in_place(ctx)) {
int tex_size;
/* Only DXTC texture compression in a contiguous block */
ctx->dec[t].tex_data.in = ctx->gbc.buffer;
tex_size = FFMIN(ctx->texture_section_size, bytestream2_get_bytes_left(&ctx->gbc));
if (tex_size < (avctx->coded_width / TEXTURE_BLOCK_W)
*(avctx->coded_height / TEXTURE_BLOCK_H)
*ctx->dec[t].tex_ratio) {
av_log(avctx, AV_LOG_ERROR, "Insufficient data\n");
return AVERROR_INVALIDDATA;
}
} else {
/* Perform the second-stage decompression */
ret = av_reallocp(&ctx->tex_buf, ctx->tex_size);
if (ret < 0)
return ret;
avctx->execute2(avctx, decompress_chunks_thread, NULL,
ctx->chunk_results, ctx->chunk_count);
for (i = 0; i < ctx->chunk_count; i++) {
if (ctx->chunk_results[i] < 0)
return ctx->chunk_results[i];
}
ctx->dec[t].tex_data.in = ctx->tex_buf;
}
ctx->dec[t].frame_data.out = frame->data[0];
ctx->dec[t].stride = frame->linesize[0];
ctx->dec[t].width = avctx->coded_width;
ctx->dec[t].height = avctx->coded_height;
ff_texturedsp_exec_decompress_threads(avctx, &ctx->dec[t]);
}
/* Frame is ready to be output */
frame->pict_type = AV_PICTURE_TYPE_I;
frame->flags |= AV_FRAME_FLAG_KEY;
*got_frame = 1;
return avpkt->size;
}
static av_cold int hap_init(AVCodecContext *avctx)
{
HapContext *ctx = avctx->priv_data;
TextureDSPContext dxtc;
const char *texture_name;
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;
}
/* Since codec is based on 4x4 blocks, size is aligned to 4 */
avctx->coded_width = FFALIGN(avctx->width, TEXTURE_BLOCK_W);
avctx->coded_height = FFALIGN(avctx->height, TEXTURE_BLOCK_H);
ff_texturedsp_init(&dxtc);
ctx->texture_count = 1;
ctx->dec[0].raw_ratio = 16;
ctx->dec[0].slice_count = av_clip(avctx->thread_count, 1,
avctx->coded_height / TEXTURE_BLOCK_H);
switch (avctx->codec_tag) {
case MKTAG('H','a','p','1'):
texture_name = "DXT1";
ctx->dec[0].tex_ratio = 8;
ctx->dec[0].tex_funct = dxtc.dxt1_block;
avctx->pix_fmt = AV_PIX_FMT_RGB0;
break;
case MKTAG('H','a','p','5'):
texture_name = "DXT5";
ctx->dec[0].tex_ratio = 16;
ctx->dec[0].tex_funct = dxtc.dxt5_block;
avctx->pix_fmt = AV_PIX_FMT_RGBA;
break;
case MKTAG('H','a','p','Y'):
texture_name = "DXT5-YCoCg-scaled";
ctx->dec[0].tex_ratio = 16;
ctx->dec[0].tex_funct = dxtc.dxt5ys_block;
avctx->pix_fmt = AV_PIX_FMT_RGB0;
break;
case MKTAG('H','a','p','A'):
texture_name = "RGTC1";
ctx->dec[0].tex_ratio = 8;
ctx->dec[0].tex_funct = dxtc.rgtc1u_gray_block;
ctx->dec[0].raw_ratio = 4;
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
break;
case MKTAG('H','a','p','M'):
texture_name = "DXT5-YCoCg-scaled / RGTC1";
ctx->dec[0].tex_ratio = 16;
ctx->dec[1].tex_ratio = 8;
ctx->dec[0].tex_funct = dxtc.dxt5ys_block;
ctx->dec[1].tex_funct = dxtc.rgtc1u_alpha_block;
ctx->dec[1].raw_ratio = 16;
ctx->dec[1].slice_count = ctx->dec[0].slice_count;
avctx->pix_fmt = AV_PIX_FMT_RGBA;
ctx->texture_count = 2;
break;
default:
return AVERROR_DECODER_NOT_FOUND;
}
av_log(avctx, AV_LOG_DEBUG, "%s texture\n", texture_name);
return 0;
}
static av_cold int hap_close(AVCodecContext *avctx)
{
HapContext *ctx = avctx->priv_data;
ff_hap_free_context(ctx);
return 0;
}
const FFCodec ff_hap_decoder = {
.p.name = "hap",
CODEC_LONG_NAME("Vidvox Hap"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_HAP,
.init = hap_init,
FF_CODEC_DECODE_CB(hap_decode),
.close = hap_close,
.priv_data_size = sizeof(HapContext),
.p.capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS |
AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.codec_tags = (const uint32_t []){
MKTAG('H','a','p','1'),
MKTAG('H','a','p','5'),
MKTAG('H','a','p','Y'),
MKTAG('H','a','p','A'),
MKTAG('H','a','p','M'),
FF_CODEC_TAGS_END,
},
};
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