/*
* Vidvox Hap decoder
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
+ * Copyright (C) 2015 Tom Butterworth <bangnoise@gmail.com>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "snappy.h"
#include "texturedsp.h"
#include "thread.h"
+#include "memory.h"
/* The first three bytes are the size of the section past the header, or zero
* if the length is stored in the next long word. The fourth byte in the first
* long word indicates the type of the current section. */
-static int parse_section_header(AVCodecContext *avctx)
+static int parse_section_header(GetByteContext *gbc, int *section_size,
+ enum HapSectionType *section_type)
{
- HapContext *ctx = avctx->priv_data;
- GetByteContext *gbc = &ctx->gbc;
- int length;
-
if (bytestream2_get_bytes_left(gbc) < 4)
return AVERROR_INVALIDDATA;
- length = bytestream2_get_le24(gbc);
+ *section_size = bytestream2_get_le24(gbc);
+ *section_type = bytestream2_get_byte(gbc);
- ctx->section_type = bytestream2_get_byte(gbc);
-
- if (length == 0) {
+ if (*section_size == 0) {
if (bytestream2_get_bytes_left(gbc) < 4)
return AVERROR_INVALIDDATA;
- length = bytestream2_get_le32(gbc);
+
+ *section_size = bytestream2_get_le32(gbc);
+ }
+
+ if (*section_size > bytestream2_get_bytes_left(gbc))
+ return AVERROR_INVALIDDATA;
+ else
+ return 0;
+}
+
+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 = parse_section_header(gbc, §ion_size, §ion_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 (length > bytestream2_get_bytes_left(gbc) || length == 0)
+ if (!had_sizes || !had_compressors)
return AVERROR_INVALIDDATA;
- return length;
+ /* 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;
+ 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;
}
-/* Prepare the texture to be decompressed */
-static int setup_texture(AVCodecContext *avctx, size_t length)
+static int hap_parse_frame_header(AVCodecContext *avctx)
{
HapContext *ctx = avctx->priv_data;
GetByteContext *gbc = &ctx->gbc;
- int64_t snappy_size;
- const char *texture_name;
+ int section_size;
+ enum HapSectionType section_type;
const char *compressorstr;
- int ret;
+ int i, ret;
- switch (ctx->section_type & 0x0F) {
- case HAP_FMT_RGBDXT1:
- ctx->tex_rat = 8;
- ctx->tex_fun = ctx->dxtc.dxt1_block;
- texture_name = "DXT1";
- break;
- case HAP_FMT_RGBADXT5:
- ctx->tex_rat = 16;
- ctx->tex_fun = ctx->dxtc.dxt5_block;
- texture_name = "DXT5";
- break;
- case HAP_FMT_YCOCGDXT5:
- ctx->tex_rat = 16;
- ctx->tex_fun = ctx->dxtc.dxt5ys_block;
- texture_name = "DXT5-YCoCg-scaled";
- break;
- default:
- av_log(avctx, AV_LOG_ERROR,
- "Invalid format mode %02X.\n", ctx->section_type);
+ ret = parse_section_header(gbc, §ion_size, §ion_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)) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid texture format %#04x.\n", section_type & 0x0F);
return AVERROR_INVALIDDATA;
}
- switch (ctx->section_type & 0xF0) {
- case HAP_COMP_NONE:
- /* Only DXTC texture compression */
- ctx->tex_data = gbc->buffer;
- ctx->tex_size = length;
- compressorstr = "none";
- break;
- case HAP_COMP_SNAPPY:
- snappy_size = ff_snappy_peek_uncompressed_length(gbc);
- ret = av_reallocp(&ctx->snappied, snappy_size);
- if (ret < 0) {
- return ret;
+ 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 = section_size;
+ }
+ if (ctx->chunks[0].compressor == HAP_COMP_NONE) {
+ compressorstr = "none";
+ } else {
+ compressorstr = "snappy";
+ }
+ break;
+ case HAP_COMP_COMPLEX:
+ ret = parse_section_header(gbc, §ion_size, §ion_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 + 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, ctx->snappied, &snappy_size);
+ ret = ff_snappy_uncompress(&gbc, dst, &uncompressed_size);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Snappy uncompress error\n");
return ret;
}
-
- ctx->tex_data = ctx->snappied;
- ctx->tex_size = snappy_size;
- compressorstr = "snappy";
- break;
- case HAP_COMP_COMPLEX:
- compressorstr = "complex";
- avpriv_request_sample(avctx, "Complex Hap compressor");
- return AVERROR_PATCHWELCOME;
- break;
- default:
- av_log(avctx, AV_LOG_ERROR,
- "Invalid compressor mode %02X.\n", ctx->section_type);
- return AVERROR_INVALIDDATA;
+ } else if (chunk->compressor == HAP_COMP_NONE) {
+ bytestream2_get_buffer(&gbc, dst, chunk->compressed_size);
}
- av_log(avctx, AV_LOG_DEBUG, "%s texture with %s compressor\n",
- texture_name, compressorstr);
-
return 0;
}
{
HapContext *ctx = avctx->priv_data;
ThreadFrame tframe;
- int ret, length;
+ int ret, i;
+ int tex_size;
bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
/* Check for section header */
- length = parse_section_header(avctx);
- if (length < 0) {
- av_log(avctx, AV_LOG_ERROR, "Frame is too small.\n");
- return length;
- }
-
- /* Prepare the texture buffer and decompress function */
- ret = setup_texture(avctx, length);
+ ret = hap_parse_frame_header(avctx);
if (ret < 0)
return ret;
ret = ff_thread_get_buffer(avctx, &tframe, 0);
if (ret < 0)
return ret;
- ff_thread_finish_setup(avctx);
+ if (avctx->codec->update_thread_context)
+ ff_thread_finish_setup(avctx);
+
+ /* Unpack the DXT texture */
+ if (hap_can_use_tex_in_place(ctx)) {
+ /* Only DXTC texture compression in a contiguous block */
+ ctx->tex_data = ctx->gbc.buffer;
+ tex_size = bytestream2_get_bytes_left(&ctx->gbc);
+ } 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->tex_data = ctx->tex_buf;
+ tex_size = ctx->tex_size;
+ }
+
+ if (tex_size < (avctx->coded_width / TEXTURE_BLOCK_W)
+ *(avctx->coded_height / TEXTURE_BLOCK_H)
+ *ctx->tex_rat) {
+ av_log(avctx, AV_LOG_ERROR, "Insufficient data\n");
+ return AVERROR_INVALIDDATA;
+ }
/* Use the decompress function on the texture, one block per thread */
avctx->execute2(avctx, decompress_texture_thread, tframe.f, NULL, ctx->slice_count);
static av_cold int hap_init(AVCodecContext *avctx)
{
HapContext *ctx = avctx->priv_data;
+ const char *texture_name;
int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
if (ret < 0) {
ff_texturedsp_init(&ctx->dxtc);
+ switch (avctx->codec_tag) {
+ case MKTAG('H','a','p','1'):
+ texture_name = "DXT1";
+ ctx->tex_rat = 8;
+ ctx->tex_fun = ctx->dxtc.dxt1_block;
+ break;
+ case MKTAG('H','a','p','5'):
+ texture_name = "DXT5";
+ ctx->tex_rat = 16;
+ ctx->tex_fun = ctx->dxtc.dxt5_block;
+ break;
+ case MKTAG('H','a','p','Y'):
+ texture_name = "DXT5-YCoCg-scaled";
+ ctx->tex_rat = 16;
+ ctx->tex_fun = ctx->dxtc.dxt5ys_block;
+ break;
+ default:
+ return AVERROR_DECODER_NOT_FOUND;
+ }
+
+ av_log(avctx, AV_LOG_DEBUG, "%s texture\n", texture_name);
+
ctx->slice_count = av_clip(avctx->thread_count, 1,
avctx->coded_height / TEXTURE_BLOCK_H);
{
HapContext *ctx = avctx->priv_data;
- av_freep(&ctx->snappied);
+ ff_hap_free_context(ctx);
return 0;
}
projects / ffmpeg / blobdiff