2010-05-18 17:58:33 +02:00
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/*
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2010-09-09 14:16:39 +02:00
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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2010-05-18 17:58:33 +02:00
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*
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2010-06-18 18:39:21 +02:00
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* Use of this source code is governed by a BSD-style license
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2010-06-04 22:19:40 +02:00
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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2010-06-18 18:39:21 +02:00
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* in the file PATENTS. All contributing project authors may
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2010-06-04 22:19:40 +02:00
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* be found in the AUTHORS file in the root of the source tree.
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2010-05-18 17:58:33 +02:00
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*/
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2013-03-05 23:12:16 +01:00
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#include <assert.h>
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2013-07-25 23:13:44 +02:00
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#include <limits.h>
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#include <stdio.h>
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2013-03-05 23:12:16 +01:00
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2014-03-06 21:08:20 +01:00
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#include "./vpx_scale_rtcd.h"
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#include "vpx_mem/vpx_mem.h"
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2014-12-19 00:50:46 +01:00
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#include "vpx_ports/vpx_once.h"
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2014-03-06 21:08:20 +01:00
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#include "vpx_ports/vpx_timer.h"
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#include "vpx_scale/vpx_scale.h"
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#include "vp9/common/vp9_alloccommon.h"
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#include "vp9/common/vp9_loopfilter.h"
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2012-11-27 22:59:17 +01:00
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#include "vp9/common/vp9_onyxc_int.h"
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2013-09-04 19:02:08 +02:00
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#if CONFIG_VP9_POSTPROC
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2012-11-27 22:59:17 +01:00
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#include "vp9/common/vp9_postproc.h"
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2010-05-18 17:58:33 +02:00
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#endif
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2012-11-27 22:59:17 +01:00
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#include "vp9/common/vp9_quant_common.h"
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2014-08-29 01:48:42 +02:00
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#include "vp9/common/vp9_reconintra.h"
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2012-11-27 22:59:17 +01:00
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#include "vp9/common/vp9_systemdependent.h"
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2014-03-06 21:08:20 +01:00
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2013-11-15 21:48:43 +01:00
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#include "vp9/decoder/vp9_decodeframe.h"
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2014-03-06 21:08:20 +01:00
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#include "vp9/decoder/vp9_decoder.h"
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2012-11-28 19:41:40 +01:00
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#include "vp9/decoder/vp9_detokenize.h"
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2010-05-18 17:58:33 +02:00
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2014-12-19 16:50:54 +01:00
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static void initialize_dec(void) {
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2014-12-19 00:50:46 +01:00
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static volatile int init_done = 0;
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2010-05-18 17:58:33 +02:00
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2012-07-14 00:21:29 +02:00
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if (!init_done) {
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2014-08-29 01:48:42 +02:00
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vp9_rtcd();
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vp9_init_intra_predictors();
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2012-07-14 00:21:29 +02:00
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init_done = 1;
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}
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2010-05-18 17:58:33 +02:00
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}
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2014-11-03 20:23:22 +01:00
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static void vp9_dec_setup_mi(VP9_COMMON *cm) {
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cm->mi = cm->mip + cm->mi_stride + 1;
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vpx_memset(cm->mip, 0, cm->mi_stride * (cm->mi_rows + 1) * sizeof(*cm->mip));
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}
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static int vp9_dec_alloc_mi(VP9_COMMON *cm, int mi_size) {
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cm->mip = vpx_calloc(mi_size, sizeof(*cm->mip));
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if (!cm->mip)
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return 1;
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cm->mi_alloc_size = mi_size;
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return 0;
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}
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static void vp9_dec_free_mi(VP9_COMMON *cm) {
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vpx_free(cm->mip);
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cm->mip = NULL;
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}
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2015-01-23 17:42:02 +01:00
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VP9Decoder *vp9_decoder_create() {
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2014-12-23 17:44:11 +01:00
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VP9Decoder *volatile const pbi = vpx_memalign(32, sizeof(*pbi));
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VP9_COMMON *volatile const cm = pbi ? &pbi->common : NULL;
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2010-05-18 17:58:33 +02:00
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2013-08-10 02:24:40 +02:00
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if (!cm)
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2012-07-14 00:21:29 +02:00
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return NULL;
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2010-05-18 17:58:33 +02:00
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2013-07-25 23:13:44 +02:00
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vp9_zero(*pbi);
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2010-05-18 17:58:33 +02:00
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2013-08-10 02:24:40 +02:00
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if (setjmp(cm->error.jmp)) {
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cm->error.setjmp = 0;
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2014-04-07 19:38:51 +02:00
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vp9_decoder_remove(pbi);
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2013-04-02 22:34:20 +02:00
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return NULL;
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2012-07-14 00:21:29 +02:00
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}
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2010-05-18 17:58:33 +02:00
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2013-08-10 02:24:40 +02:00
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cm->error.setjmp = 1;
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2014-10-22 23:37:38 +02:00
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CHECK_MEM_ERROR(cm, cm->fc,
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(FRAME_CONTEXT *)vpx_calloc(1, sizeof(*cm->fc)));
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CHECK_MEM_ERROR(cm, cm->frame_contexts,
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(FRAME_CONTEXT *)vpx_calloc(FRAME_CONTEXTS,
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sizeof(*cm->frame_contexts)));
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2014-09-10 03:55:20 +02:00
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pbi->need_resync = 1;
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2014-12-19 00:50:46 +01:00
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once(initialize_dec);
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2010-05-18 17:58:33 +02:00
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2014-04-07 19:38:51 +02:00
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// Initialize the references to not point to any frame buffers.
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vpx_memset(&cm->ref_frame_map, -1, sizeof(cm->ref_frame_map));
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cm->current_video_frame = 0;
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2012-07-14 00:21:29 +02:00
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pbi->ready_for_new_data = 1;
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2014-08-26 21:35:15 +02:00
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cm->bit_depth = VPX_BITS_8;
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2014-09-26 00:46:50 +02:00
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cm->dequant_bit_depth = VPX_BITS_8;
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2010-05-18 17:58:33 +02:00
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2014-11-03 20:23:22 +01:00
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cm->alloc_mi = vp9_dec_alloc_mi;
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cm->free_mi = vp9_dec_free_mi;
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cm->setup_mi = vp9_dec_setup_mi;
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2013-04-26 21:30:20 +02:00
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// vp9_init_dequantizer() is first called here. Add check in
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2013-04-02 22:34:20 +02:00
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// frame_init_dequantizer() to avoid unnecessary calling of
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2013-04-26 21:30:20 +02:00
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// vp9_init_dequantizer() for every frame.
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2013-08-10 02:24:40 +02:00
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vp9_init_dequantizer(cm);
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2010-05-18 17:58:33 +02:00
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2013-08-10 02:24:40 +02:00
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vp9_loop_filter_init(cm);
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2010-05-18 17:58:33 +02:00
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2013-08-10 02:24:40 +02:00
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cm->error.setjmp = 0;
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2011-05-02 15:30:51 +02:00
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2014-06-20 06:14:51 +02:00
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vp9_get_worker_interface()->init(&pbi->lf_worker);
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2013-08-01 01:15:10 +02:00
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2013-04-02 22:34:20 +02:00
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return pbi;
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2010-05-18 17:58:33 +02:00
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}
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2014-04-08 20:41:12 +02:00
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void vp9_decoder_remove(VP9Decoder *pbi) {
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2015-01-23 17:42:02 +01:00
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VP9_COMMON *const cm = &pbi->common;
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2013-10-26 14:33:45 +02:00
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int i;
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2010-05-18 17:58:33 +02:00
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2014-06-20 06:14:51 +02:00
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vp9_get_worker_interface()->end(&pbi->lf_worker);
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2013-08-01 01:15:10 +02:00
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vpx_free(pbi->lf_worker.data1);
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2014-05-15 19:51:55 +02:00
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vpx_free(pbi->tile_data);
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2013-10-26 14:33:45 +02:00
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for (i = 0; i < pbi->num_tile_workers; ++i) {
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VP9Worker *const worker = &pbi->tile_workers[i];
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2014-06-20 06:14:51 +02:00
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vp9_get_worker_interface()->end(worker);
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2013-10-26 14:33:45 +02:00
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}
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2014-08-31 05:15:37 +02:00
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vpx_free(pbi->tile_worker_data);
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vpx_free(pbi->tile_worker_info);
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2013-10-26 14:33:45 +02:00
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vpx_free(pbi->tile_workers);
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2013-12-28 00:25:54 +01:00
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2014-08-29 02:11:31 +02:00
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if (pbi->num_tile_workers > 0) {
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vp9_loop_filter_dealloc(&pbi->lf_row_sync);
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2013-12-28 00:25:54 +01:00
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}
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2015-01-23 17:42:02 +01:00
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vp9_remove_common(cm);
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2012-07-14 00:21:29 +02:00
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vpx_free(pbi);
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2010-05-18 17:58:33 +02:00
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}
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2014-01-29 21:48:01 +01:00
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static int equal_dimensions(const YV12_BUFFER_CONFIG *a,
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const YV12_BUFFER_CONFIG *b) {
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2013-03-27 22:22:30 +01:00
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return a->y_height == b->y_height && a->y_width == b->y_width &&
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a->uv_height == b->uv_height && a->uv_width == b->uv_width;
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}
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2010-05-18 17:58:33 +02:00
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2014-04-08 20:41:12 +02:00
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vpx_codec_err_t vp9_copy_reference_dec(VP9Decoder *pbi,
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2013-03-13 20:15:43 +01:00
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VP9_REFFRAME ref_frame_flag,
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YV12_BUFFER_CONFIG *sd) {
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2012-10-31 01:53:32 +01:00
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VP9_COMMON *cm = &pbi->common;
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2012-07-14 00:21:29 +02:00
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2013-01-15 22:49:44 +01:00
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/* TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
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* encoder is using the frame buffers for. This is just a stub to keep the
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* vpxenc --test-decode functionality working, and will be replaced in a
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* later commit that adds VP9-specific controls for this functionality.
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*/
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2013-03-27 22:22:30 +01:00
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if (ref_frame_flag == VP9_LAST_FLAG) {
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2014-08-14 23:56:08 +02:00
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const YV12_BUFFER_CONFIG *const cfg = get_ref_frame(cm, 0);
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if (cfg == NULL) {
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vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
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"No 'last' reference frame");
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return VPX_CODEC_ERROR;
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}
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2013-10-23 02:21:27 +02:00
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if (!equal_dimensions(cfg, sd))
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vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
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"Incorrect buffer dimensions");
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else
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vp8_yv12_copy_frame(cfg, sd);
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2013-03-27 22:22:30 +01:00
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} else {
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2013-08-08 23:52:39 +02:00
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vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
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2012-07-14 00:21:29 +02:00
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"Invalid reference frame");
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2013-03-27 22:22:30 +01:00
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}
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2010-07-22 14:07:32 +02:00
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2013-08-08 23:52:39 +02:00
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return cm->error.error_code;
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2010-05-18 17:58:33 +02:00
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}
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2011-03-17 22:07:59 +01:00
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2014-03-21 22:20:13 +01:00
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vpx_codec_err_t vp9_set_reference_dec(VP9_COMMON *cm,
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2014-02-28 04:08:10 +01:00
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VP9_REFFRAME ref_frame_flag,
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2012-10-31 00:16:28 +01:00
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YV12_BUFFER_CONFIG *sd) {
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2013-12-28 03:44:19 +01:00
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RefBuffer *ref_buf = NULL;
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2012-07-14 00:21:29 +02:00
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2014-03-21 22:20:13 +01:00
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// TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
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// encoder is using the frame buffers for. This is just a stub to keep the
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// vpxenc --test-decode functionality working, and will be replaced in a
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// later commit that adds VP9-specific controls for this functionality.
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2013-09-29 20:03:53 +02:00
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if (ref_frame_flag == VP9_LAST_FLAG) {
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2013-12-28 03:44:19 +01:00
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ref_buf = &cm->frame_refs[0];
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2013-09-29 20:03:53 +02:00
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} else if (ref_frame_flag == VP9_GOLD_FLAG) {
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2013-12-28 03:44:19 +01:00
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ref_buf = &cm->frame_refs[1];
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2013-09-29 20:03:53 +02:00
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} else if (ref_frame_flag == VP9_ALT_FLAG) {
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2013-12-28 03:44:19 +01:00
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ref_buf = &cm->frame_refs[2];
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2013-09-29 20:03:53 +02:00
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} else {
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2014-03-21 22:20:13 +01:00
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vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
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2012-07-14 00:21:29 +02:00
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"Invalid reference frame");
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2014-03-21 22:20:13 +01:00
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return cm->error.error_code;
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2012-07-14 00:21:29 +02:00
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}
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2011-05-23 13:47:33 +02:00
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2013-12-28 03:44:19 +01:00
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if (!equal_dimensions(ref_buf->buf, sd)) {
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2014-03-21 22:20:13 +01:00
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vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
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2012-07-14 00:21:29 +02:00
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"Incorrect buffer dimensions");
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} else {
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2013-12-28 03:44:19 +01:00
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int *ref_fb_ptr = &ref_buf->idx;
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2013-03-27 22:22:30 +01:00
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// Find an empty frame buffer.
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const int free_fb = get_free_fb(cm);
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2014-01-29 21:48:01 +01:00
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// Decrease ref_count since it will be increased again in
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2013-03-27 22:22:30 +01:00
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// ref_cnt_fb() below.
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2015-01-23 17:42:02 +01:00
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cm->frame_bufs[free_fb].ref_count--;
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2012-07-14 00:21:29 +02:00
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2013-03-27 22:22:30 +01:00
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// Manage the reference counters and copy image.
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2015-01-23 17:42:02 +01:00
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ref_cnt_fb(cm->frame_bufs, ref_fb_ptr, free_fb);
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ref_buf->buf = &cm->frame_bufs[*ref_fb_ptr].buf;
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2013-12-28 03:44:19 +01:00
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vp8_yv12_copy_frame(sd, ref_buf->buf);
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2012-07-14 00:21:29 +02:00
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}
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2010-07-22 14:07:32 +02:00
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2014-03-21 22:20:13 +01:00
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return cm->error.error_code;
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2010-05-18 17:58:33 +02:00
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}
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2013-04-03 00:08:50 +02:00
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/* If any buffer updating is signaled it should be done here. */
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2014-04-08 20:41:12 +02:00
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static void swap_frame_buffers(VP9Decoder *pbi) {
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2013-01-15 22:49:44 +01:00
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int ref_index = 0, mask;
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2013-08-08 23:52:39 +02:00
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VP9_COMMON *const cm = &pbi->common;
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2010-07-22 14:07:32 +02:00
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2013-01-15 22:49:44 +01:00
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for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
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2015-01-23 17:42:02 +01:00
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if (mask & 1) {
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const int old_idx = cm->ref_frame_map[ref_index];
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ref_cnt_fb(cm->frame_bufs, &cm->ref_frame_map[ref_index],
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cm->new_fb_idx);
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if (old_idx >= 0 && cm->frame_bufs[old_idx].ref_count == 0)
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cm->release_fb_cb(cm->cb_priv,
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&cm->frame_bufs[old_idx].raw_frame_buffer);
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2014-02-06 02:44:42 +01:00
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}
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2013-01-15 22:49:44 +01:00
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++ref_index;
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}
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2010-07-22 14:07:32 +02:00
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2013-10-24 21:20:35 +02:00
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cm->frame_to_show = get_frame_new_buffer(cm);
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2015-01-23 17:42:02 +01:00
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cm->frame_bufs[cm->new_fb_idx].ref_count--;
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2013-01-16 21:19:42 +01:00
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2013-08-08 23:52:39 +02:00
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// Invalidate these references until the next frame starts.
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2013-01-16 21:19:42 +01:00
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for (ref_index = 0; ref_index < 3; ref_index++)
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2015-01-23 17:42:02 +01:00
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cm->frame_refs[ref_index].idx = -1;
|
2010-07-22 14:07:32 +02:00
|
|
|
}
|
|
|
|
|
2014-04-08 20:41:12 +02:00
|
|
|
int vp9_receive_compressed_data(VP9Decoder *pbi,
|
2014-05-14 02:35:46 +02:00
|
|
|
size_t size, const uint8_t **psource) {
|
2014-12-23 17:44:11 +01:00
|
|
|
VP9_COMMON *volatile const cm = &pbi->common;
|
2013-04-02 22:34:20 +02:00
|
|
|
const uint8_t *source = *psource;
|
2012-07-14 00:21:29 +02:00
|
|
|
int retcode = 0;
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2013-08-08 23:52:39 +02:00
|
|
|
cm->error.error_code = VPX_CODEC_OK;
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2014-03-20 23:01:37 +01:00
|
|
|
if (size == 0) {
|
2014-03-21 22:20:13 +01:00
|
|
|
// This is used to signal that we are missing frames.
|
|
|
|
// We do not know if the missing frame(s) was supposed to update
|
|
|
|
// any of the reference buffers, but we act conservative and
|
|
|
|
// mark only the last buffer as corrupted.
|
|
|
|
//
|
|
|
|
// TODO(jkoleszar): Error concealment is undefined and non-normative
|
|
|
|
// at this point, but if it becomes so, [0] may not always be the correct
|
|
|
|
// thing to do here.
|
2015-01-06 22:50:18 +01:00
|
|
|
if (cm->frame_refs[0].idx > 0)
|
2013-12-28 03:44:19 +01:00
|
|
|
cm->frame_refs[0].buf->corrupted = 1;
|
2012-07-14 00:21:29 +02:00
|
|
|
}
|
2010-12-16 16:46:31 +01:00
|
|
|
|
2014-10-17 19:09:56 +02:00
|
|
|
pbi->ready_for_new_data = 0;
|
|
|
|
|
2014-02-12 03:33:02 +01:00
|
|
|
// Check if the previous frame was a frame without any references to it.
|
2015-01-23 17:42:02 +01:00
|
|
|
if (cm->new_fb_idx >= 0 && cm->frame_bufs[cm->new_fb_idx].ref_count == 0)
|
|
|
|
cm->release_fb_cb(cm->cb_priv,
|
|
|
|
&cm->frame_bufs[cm->new_fb_idx].raw_frame_buffer);
|
2012-07-14 00:21:29 +02:00
|
|
|
cm->new_fb_idx = get_free_fb(cm);
|
2010-10-20 00:40:46 +02:00
|
|
|
|
2014-10-28 00:19:04 +01:00
|
|
|
// Assign a MV array to the frame buffer.
|
2015-01-23 17:42:02 +01:00
|
|
|
cm->cur_frame = &cm->frame_bufs[cm->new_fb_idx];
|
2014-10-28 00:19:04 +01:00
|
|
|
|
2013-08-08 23:52:39 +02:00
|
|
|
if (setjmp(cm->error.jmp)) {
|
2014-12-03 01:51:27 +01:00
|
|
|
const VP9WorkerInterface *const winterface = vp9_get_worker_interface();
|
|
|
|
int i;
|
|
|
|
|
2015-01-23 17:42:02 +01:00
|
|
|
pbi->need_resync = 1;
|
2013-08-08 23:52:39 +02:00
|
|
|
cm->error.setjmp = 0;
|
2014-12-03 01:51:27 +01:00
|
|
|
|
|
|
|
// Synchronize all threads immediately as a subsequent decode call may
|
|
|
|
// cause a resize invalidating some allocations.
|
|
|
|
winterface->sync(&pbi->lf_worker);
|
|
|
|
for (i = 0; i < pbi->num_tile_workers; ++i) {
|
|
|
|
winterface->sync(&pbi->tile_workers[i]);
|
|
|
|
}
|
|
|
|
|
2015-01-21 23:51:08 +01:00
|
|
|
vp9_clear_system_state();
|
2015-01-23 17:42:02 +01:00
|
|
|
|
|
|
|
if (cm->new_fb_idx > 0 && cm->frame_bufs[cm->new_fb_idx].ref_count > 0)
|
|
|
|
cm->frame_bufs[cm->new_fb_idx].ref_count--;
|
|
|
|
|
2012-07-14 00:21:29 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2013-08-08 23:52:39 +02:00
|
|
|
cm->error.setjmp = 1;
|
2012-02-27 23:23:38 +01:00
|
|
|
|
2014-05-22 00:51:40 +02:00
|
|
|
vp9_decode_frame(pbi, source, source + size, psource);
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2014-07-14 14:36:21 +02:00
|
|
|
swap_frame_buffers(pbi);
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2012-10-31 22:40:53 +01:00
|
|
|
vp9_clear_system_state();
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2013-12-28 00:25:54 +01:00
|
|
|
cm->last_width = cm->width;
|
|
|
|
cm->last_height = cm->height;
|
|
|
|
|
2014-10-28 00:19:04 +01:00
|
|
|
if (!cm->show_existing_frame) {
|
2014-01-23 18:26:19 +01:00
|
|
|
cm->last_show_frame = cm->show_frame;
|
2014-10-28 00:19:04 +01:00
|
|
|
cm->prev_frame = cm->cur_frame;
|
|
|
|
}
|
2014-03-13 21:55:33 +01:00
|
|
|
|
2015-01-23 17:42:02 +01:00
|
|
|
if (cm->show_frame)
|
|
|
|
cm->current_video_frame++;
|
2011-11-16 01:16:30 +01:00
|
|
|
|
2013-08-08 23:52:39 +02:00
|
|
|
cm->error.setjmp = 0;
|
2012-07-14 00:21:29 +02:00
|
|
|
return retcode;
|
2010-05-18 17:58:33 +02:00
|
|
|
}
|
2012-10-31 00:16:28 +01:00
|
|
|
|
2014-04-08 20:41:12 +02:00
|
|
|
int vp9_get_raw_frame(VP9Decoder *pbi, YV12_BUFFER_CONFIG *sd,
|
2012-10-31 22:40:53 +01:00
|
|
|
vp9_ppflags_t *flags) {
|
2014-06-10 00:22:17 +02:00
|
|
|
VP9_COMMON *const cm = &pbi->common;
|
2012-07-14 00:21:29 +02:00
|
|
|
int ret = -1;
|
2014-05-13 19:28:47 +02:00
|
|
|
#if !CONFIG_VP9_POSTPROC
|
|
|
|
(void)*flags;
|
|
|
|
#endif
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2012-07-14 00:21:29 +02:00
|
|
|
if (pbi->ready_for_new_data == 1)
|
|
|
|
return ret;
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2014-10-17 19:09:56 +02:00
|
|
|
pbi->ready_for_new_data = 1;
|
|
|
|
|
2014-05-13 19:28:47 +02:00
|
|
|
/* no raw frame to show!!! */
|
2014-06-10 00:22:17 +02:00
|
|
|
if (!cm->show_frame)
|
2012-07-14 00:21:29 +02:00
|
|
|
return ret;
|
2010-05-18 17:58:33 +02:00
|
|
|
|
2013-09-04 19:02:08 +02:00
|
|
|
#if CONFIG_VP9_POSTPROC
|
2014-06-10 00:22:17 +02:00
|
|
|
if (!cm->show_existing_frame) {
|
|
|
|
ret = vp9_post_proc_frame(cm, sd, flags);
|
|
|
|
} else {
|
|
|
|
*sd = *cm->frame_to_show;
|
|
|
|
ret = 0;
|
|
|
|
}
|
2010-05-18 17:58:33 +02:00
|
|
|
#else
|
2014-06-10 00:22:17 +02:00
|
|
|
*sd = *cm->frame_to_show;
|
2014-05-13 19:28:47 +02:00
|
|
|
ret = 0;
|
2010-10-28 01:04:02 +02:00
|
|
|
#endif /*!CONFIG_POSTPROC*/
|
2012-10-31 22:40:53 +01:00
|
|
|
vp9_clear_system_state();
|
2012-07-14 00:21:29 +02:00
|
|
|
return ret;
|
2010-05-18 17:58:33 +02:00
|
|
|
}
|
2014-08-13 22:12:00 +02:00
|
|
|
|
|
|
|
vpx_codec_err_t vp9_parse_superframe_index(const uint8_t *data,
|
|
|
|
size_t data_sz,
|
|
|
|
uint32_t sizes[8], int *count,
|
|
|
|
vpx_decrypt_cb decrypt_cb,
|
|
|
|
void *decrypt_state) {
|
|
|
|
// A chunk ending with a byte matching 0xc0 is an invalid chunk unless
|
|
|
|
// it is a super frame index. If the last byte of real video compression
|
|
|
|
// data is 0xc0 the encoder must add a 0 byte. If we have the marker but
|
|
|
|
// not the associated matching marker byte at the front of the index we have
|
|
|
|
// an invalid bitstream and need to return an error.
|
|
|
|
|
|
|
|
uint8_t marker;
|
|
|
|
|
|
|
|
assert(data_sz);
|
|
|
|
marker = read_marker(decrypt_cb, decrypt_state, data + data_sz - 1);
|
|
|
|
*count = 0;
|
|
|
|
|
|
|
|
if ((marker & 0xe0) == 0xc0) {
|
|
|
|
const uint32_t frames = (marker & 0x7) + 1;
|
|
|
|
const uint32_t mag = ((marker >> 3) & 0x3) + 1;
|
|
|
|
const size_t index_sz = 2 + mag * frames;
|
|
|
|
|
|
|
|
// This chunk is marked as having a superframe index but doesn't have
|
|
|
|
// enough data for it, thus it's an invalid superframe index.
|
|
|
|
if (data_sz < index_sz)
|
|
|
|
return VPX_CODEC_CORRUPT_FRAME;
|
|
|
|
|
|
|
|
{
|
|
|
|
const uint8_t marker2 = read_marker(decrypt_cb, decrypt_state,
|
|
|
|
data + data_sz - index_sz);
|
|
|
|
|
|
|
|
// This chunk is marked as having a superframe index but doesn't have
|
|
|
|
// the matching marker byte at the front of the index therefore it's an
|
|
|
|
// invalid chunk.
|
|
|
|
if (marker != marker2)
|
|
|
|
return VPX_CODEC_CORRUPT_FRAME;
|
|
|
|
}
|
|
|
|
|
|
|
|
{
|
|
|
|
// Found a valid superframe index.
|
|
|
|
uint32_t i, j;
|
|
|
|
const uint8_t *x = &data[data_sz - index_sz + 1];
|
|
|
|
|
|
|
|
// Frames has a maximum of 8 and mag has a maximum of 4.
|
|
|
|
uint8_t clear_buffer[32];
|
|
|
|
assert(sizeof(clear_buffer) >= frames * mag);
|
|
|
|
if (decrypt_cb) {
|
|
|
|
decrypt_cb(decrypt_state, x, clear_buffer, frames * mag);
|
|
|
|
x = clear_buffer;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < frames; ++i) {
|
|
|
|
uint32_t this_sz = 0;
|
|
|
|
|
|
|
|
for (j = 0; j < mag; ++j)
|
|
|
|
this_sz |= (*x++) << (j * 8);
|
|
|
|
sizes[i] = this_sz;
|
|
|
|
}
|
|
|
|
*count = frames;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return VPX_CODEC_OK;
|
|
|
|
}
|