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-rw-r--r--media/libvpx/libvpx/vp9/decoder/vp9_decoder.c584
1 files changed, 584 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp9/decoder/vp9_decoder.c b/media/libvpx/libvpx/vp9/decoder/vp9_decoder.c
new file mode 100644
index 0000000000..7db8ed72d5
--- /dev/null
+++ b/media/libvpx/libvpx/vp9/decoder/vp9_decoder.c
@@ -0,0 +1,584 @@
+/*
+ * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <assert.h>
+#include <limits.h>
+#include <stdio.h>
+
+#include "./vp9_rtcd.h"
+#include "./vpx_dsp_rtcd.h"
+#include "./vpx_scale_rtcd.h"
+
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_ports/system_state.h"
+#include "vpx_ports/vpx_once.h"
+#include "vpx_ports/vpx_timer.h"
+#include "vpx_scale/vpx_scale.h"
+#include "vpx_util/vpx_thread.h"
+
+#include "vp9/common/vp9_alloccommon.h"
+#include "vp9/common/vp9_loopfilter.h"
+#include "vp9/common/vp9_onyxc_int.h"
+#if CONFIG_VP9_POSTPROC
+#include "vp9/common/vp9_postproc.h"
+#endif
+#include "vp9/common/vp9_quant_common.h"
+#include "vp9/common/vp9_reconintra.h"
+
+#include "vp9/decoder/vp9_decodeframe.h"
+#include "vp9/decoder/vp9_decoder.h"
+#include "vp9/decoder/vp9_detokenize.h"
+
+static void initialize_dec(void) {
+ static volatile int init_done = 0;
+
+ if (!init_done) {
+ vp9_rtcd();
+ vpx_dsp_rtcd();
+ vpx_scale_rtcd();
+ vp9_init_intra_predictors();
+ init_done = 1;
+ }
+}
+
+static void vp9_dec_setup_mi(VP9_COMMON *cm) {
+ cm->mi = cm->mip + cm->mi_stride + 1;
+ cm->mi_grid_visible = cm->mi_grid_base + cm->mi_stride + 1;
+ memset(cm->mi_grid_base, 0,
+ cm->mi_stride * (cm->mi_rows + 1) * sizeof(*cm->mi_grid_base));
+}
+
+void vp9_dec_alloc_row_mt_mem(RowMTWorkerData *row_mt_worker_data,
+ VP9_COMMON *cm, int num_sbs, int max_threads,
+ int num_jobs) {
+ int plane;
+ const size_t dqcoeff_size = (num_sbs << DQCOEFFS_PER_SB_LOG2) *
+ sizeof(*row_mt_worker_data->dqcoeff[0]);
+ row_mt_worker_data->num_jobs = num_jobs;
+#if CONFIG_MULTITHREAD
+ {
+ int i;
+ CHECK_MEM_ERROR(
+ cm, row_mt_worker_data->recon_sync_mutex,
+ vpx_malloc(sizeof(*row_mt_worker_data->recon_sync_mutex) * num_jobs));
+ if (row_mt_worker_data->recon_sync_mutex) {
+ for (i = 0; i < num_jobs; ++i) {
+ pthread_mutex_init(&row_mt_worker_data->recon_sync_mutex[i], NULL);
+ }
+ }
+
+ CHECK_MEM_ERROR(
+ cm, row_mt_worker_data->recon_sync_cond,
+ vpx_malloc(sizeof(*row_mt_worker_data->recon_sync_cond) * num_jobs));
+ if (row_mt_worker_data->recon_sync_cond) {
+ for (i = 0; i < num_jobs; ++i) {
+ pthread_cond_init(&row_mt_worker_data->recon_sync_cond[i], NULL);
+ }
+ }
+ }
+#endif
+ row_mt_worker_data->num_sbs = num_sbs;
+ for (plane = 0; plane < 3; ++plane) {
+ CHECK_MEM_ERROR(cm, row_mt_worker_data->dqcoeff[plane],
+ vpx_memalign(16, dqcoeff_size));
+ memset(row_mt_worker_data->dqcoeff[plane], 0, dqcoeff_size);
+ CHECK_MEM_ERROR(cm, row_mt_worker_data->eob[plane],
+ vpx_calloc(num_sbs << EOBS_PER_SB_LOG2,
+ sizeof(*row_mt_worker_data->eob[plane])));
+ }
+ CHECK_MEM_ERROR(cm, row_mt_worker_data->partition,
+ vpx_calloc(num_sbs * PARTITIONS_PER_SB,
+ sizeof(*row_mt_worker_data->partition)));
+ CHECK_MEM_ERROR(cm, row_mt_worker_data->recon_map,
+ vpx_calloc(num_sbs, sizeof(*row_mt_worker_data->recon_map)));
+
+ // allocate memory for thread_data
+ if (row_mt_worker_data->thread_data == NULL) {
+ const size_t thread_size =
+ max_threads * sizeof(*row_mt_worker_data->thread_data);
+ CHECK_MEM_ERROR(cm, row_mt_worker_data->thread_data,
+ vpx_memalign(32, thread_size));
+ }
+}
+
+void vp9_dec_free_row_mt_mem(RowMTWorkerData *row_mt_worker_data) {
+ if (row_mt_worker_data != NULL) {
+ int plane;
+#if CONFIG_MULTITHREAD
+ int i;
+ if (row_mt_worker_data->recon_sync_mutex != NULL) {
+ for (i = 0; i < row_mt_worker_data->num_jobs; ++i) {
+ pthread_mutex_destroy(&row_mt_worker_data->recon_sync_mutex[i]);
+ }
+ vpx_free(row_mt_worker_data->recon_sync_mutex);
+ row_mt_worker_data->recon_sync_mutex = NULL;
+ }
+ if (row_mt_worker_data->recon_sync_cond != NULL) {
+ for (i = 0; i < row_mt_worker_data->num_jobs; ++i) {
+ pthread_cond_destroy(&row_mt_worker_data->recon_sync_cond[i]);
+ }
+ vpx_free(row_mt_worker_data->recon_sync_cond);
+ row_mt_worker_data->recon_sync_cond = NULL;
+ }
+#endif
+ for (plane = 0; plane < 3; ++plane) {
+ vpx_free(row_mt_worker_data->eob[plane]);
+ row_mt_worker_data->eob[plane] = NULL;
+ vpx_free(row_mt_worker_data->dqcoeff[plane]);
+ row_mt_worker_data->dqcoeff[plane] = NULL;
+ }
+ vpx_free(row_mt_worker_data->partition);
+ row_mt_worker_data->partition = NULL;
+ vpx_free(row_mt_worker_data->recon_map);
+ row_mt_worker_data->recon_map = NULL;
+ vpx_free(row_mt_worker_data->thread_data);
+ row_mt_worker_data->thread_data = NULL;
+ }
+}
+
+static int vp9_dec_alloc_mi(VP9_COMMON *cm, int mi_size) {
+ cm->mip = vpx_calloc(mi_size, sizeof(*cm->mip));
+ if (!cm->mip) return 1;
+ cm->mi_alloc_size = mi_size;
+ cm->mi_grid_base = (MODE_INFO **)vpx_calloc(mi_size, sizeof(MODE_INFO *));
+ if (!cm->mi_grid_base) return 1;
+ return 0;
+}
+
+static void vp9_dec_free_mi(VP9_COMMON *cm) {
+#if CONFIG_VP9_POSTPROC
+ // MFQE allocates an additional mip and swaps it with cm->mip.
+ vpx_free(cm->postproc_state.prev_mip);
+ cm->postproc_state.prev_mip = NULL;
+#endif
+ vpx_free(cm->mip);
+ cm->mip = NULL;
+ vpx_free(cm->mi_grid_base);
+ cm->mi_grid_base = NULL;
+ cm->mi_alloc_size = 0;
+}
+
+VP9Decoder *vp9_decoder_create(BufferPool *const pool) {
+ VP9Decoder *volatile const pbi = vpx_memalign(32, sizeof(*pbi));
+ VP9_COMMON *volatile const cm = pbi ? &pbi->common : NULL;
+
+ if (!cm) return NULL;
+
+ vp9_zero(*pbi);
+
+ if (setjmp(cm->error.jmp)) {
+ cm->error.setjmp = 0;
+ vp9_decoder_remove(pbi);
+ return NULL;
+ }
+
+ cm->error.setjmp = 1;
+
+ CHECK_MEM_ERROR(cm, cm->fc, (FRAME_CONTEXT *)vpx_calloc(1, sizeof(*cm->fc)));
+ CHECK_MEM_ERROR(
+ cm, cm->frame_contexts,
+ (FRAME_CONTEXT *)vpx_calloc(FRAME_CONTEXTS, sizeof(*cm->frame_contexts)));
+
+ pbi->need_resync = 1;
+ once(initialize_dec);
+
+ // Initialize the references to not point to any frame buffers.
+ memset(&cm->ref_frame_map, -1, sizeof(cm->ref_frame_map));
+ memset(&cm->next_ref_frame_map, -1, sizeof(cm->next_ref_frame_map));
+
+ init_frame_indexes(cm);
+ pbi->ready_for_new_data = 1;
+ pbi->common.buffer_pool = pool;
+
+ cm->bit_depth = VPX_BITS_8;
+ cm->dequant_bit_depth = VPX_BITS_8;
+
+ cm->alloc_mi = vp9_dec_alloc_mi;
+ cm->free_mi = vp9_dec_free_mi;
+ cm->setup_mi = vp9_dec_setup_mi;
+
+ vp9_loop_filter_init(cm);
+
+ cm->error.setjmp = 0;
+
+ vpx_get_worker_interface()->init(&pbi->lf_worker);
+
+ return pbi;
+}
+
+void vp9_decoder_remove(VP9Decoder *pbi) {
+ int i;
+
+ if (!pbi) return;
+
+ vpx_get_worker_interface()->end(&pbi->lf_worker);
+ vpx_free(pbi->lf_worker.data1);
+
+ for (i = 0; i < pbi->num_tile_workers; ++i) {
+ VPxWorker *const worker = &pbi->tile_workers[i];
+ vpx_get_worker_interface()->end(worker);
+ }
+
+ vpx_free(pbi->tile_worker_data);
+ vpx_free(pbi->tile_workers);
+
+ if (pbi->num_tile_workers > 0) {
+ vp9_loop_filter_dealloc(&pbi->lf_row_sync);
+ }
+
+ if (pbi->row_mt == 1) {
+ vp9_dec_free_row_mt_mem(pbi->row_mt_worker_data);
+ if (pbi->row_mt_worker_data != NULL) {
+ vp9_jobq_deinit(&pbi->row_mt_worker_data->jobq);
+ vpx_free(pbi->row_mt_worker_data->jobq_buf);
+#if CONFIG_MULTITHREAD
+ pthread_mutex_destroy(&pbi->row_mt_worker_data->recon_done_mutex);
+#endif
+ }
+ vpx_free(pbi->row_mt_worker_data);
+ }
+
+ vp9_remove_common(&pbi->common);
+ vpx_free(pbi);
+}
+
+static int equal_dimensions(const YV12_BUFFER_CONFIG *a,
+ const YV12_BUFFER_CONFIG *b) {
+ return a->y_height == b->y_height && a->y_width == b->y_width &&
+ a->uv_height == b->uv_height && a->uv_width == b->uv_width;
+}
+
+vpx_codec_err_t vp9_copy_reference_dec(VP9Decoder *pbi,
+ VP9_REFFRAME ref_frame_flag,
+ YV12_BUFFER_CONFIG *sd) {
+ VP9_COMMON *cm = &pbi->common;
+
+ /* TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
+ * encoder is using the frame buffers for. This is just a stub to keep the
+ * vpxenc --test-decode functionality working, and will be replaced in a
+ * later commit that adds VP9-specific controls for this functionality.
+ */
+ if (ref_frame_flag == VP9_LAST_FLAG) {
+ const YV12_BUFFER_CONFIG *const cfg = get_ref_frame(cm, 0);
+ if (cfg == NULL) {
+ vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
+ "No 'last' reference frame");
+ return VPX_CODEC_ERROR;
+ }
+ if (!equal_dimensions(cfg, sd))
+ vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
+ "Incorrect buffer dimensions");
+ else
+ vpx_yv12_copy_frame(cfg, sd);
+ } else {
+ vpx_internal_error(&cm->error, VPX_CODEC_ERROR, "Invalid reference frame");
+ }
+
+ return cm->error.error_code;
+}
+
+vpx_codec_err_t vp9_set_reference_dec(VP9_COMMON *cm,
+ VP9_REFFRAME ref_frame_flag,
+ YV12_BUFFER_CONFIG *sd) {
+ int idx;
+ YV12_BUFFER_CONFIG *ref_buf = NULL;
+
+ // TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
+ // encoder is using the frame buffers for. This is just a stub to keep the
+ // vpxenc --test-decode functionality working, and will be replaced in a
+ // later commit that adds VP9-specific controls for this functionality.
+ // (Yunqing) The set_reference control depends on the following setting in
+ // encoder.
+ // cpi->lst_fb_idx = 0;
+ // cpi->gld_fb_idx = 1;
+ // cpi->alt_fb_idx = 2;
+ if (ref_frame_flag == VP9_LAST_FLAG) {
+ idx = cm->ref_frame_map[0];
+ } else if (ref_frame_flag == VP9_GOLD_FLAG) {
+ idx = cm->ref_frame_map[1];
+ } else if (ref_frame_flag == VP9_ALT_FLAG) {
+ idx = cm->ref_frame_map[2];
+ } else {
+ vpx_internal_error(&cm->error, VPX_CODEC_ERROR, "Invalid reference frame");
+ return cm->error.error_code;
+ }
+
+ if (idx < 0 || idx >= FRAME_BUFFERS) {
+ vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
+ "Invalid reference frame map");
+ return cm->error.error_code;
+ }
+
+ // Get the destination reference buffer.
+ ref_buf = &cm->buffer_pool->frame_bufs[idx].buf;
+
+ if (!equal_dimensions(ref_buf, sd)) {
+ vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
+ "Incorrect buffer dimensions");
+ } else {
+ // Overwrite the reference frame buffer.
+ vpx_yv12_copy_frame(sd, ref_buf);
+ }
+
+ return cm->error.error_code;
+}
+
+/* If any buffer updating is signaled it should be done here. */
+static void swap_frame_buffers(VP9Decoder *pbi) {
+ int ref_index = 0, mask;
+ VP9_COMMON *const cm = &pbi->common;
+ BufferPool *const pool = cm->buffer_pool;
+ RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
+
+ for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
+ const int old_idx = cm->ref_frame_map[ref_index];
+ // Current thread releases the holding of reference frame.
+ decrease_ref_count(old_idx, frame_bufs, pool);
+
+ // Release the reference frame in reference map.
+ if (mask & 1) {
+ decrease_ref_count(old_idx, frame_bufs, pool);
+ }
+ cm->ref_frame_map[ref_index] = cm->next_ref_frame_map[ref_index];
+ ++ref_index;
+ }
+
+ // Current thread releases the holding of reference frame.
+ for (; ref_index < REF_FRAMES && !cm->show_existing_frame; ++ref_index) {
+ const int old_idx = cm->ref_frame_map[ref_index];
+ decrease_ref_count(old_idx, frame_bufs, pool);
+ cm->ref_frame_map[ref_index] = cm->next_ref_frame_map[ref_index];
+ }
+ pbi->hold_ref_buf = 0;
+ cm->frame_to_show = get_frame_new_buffer(cm);
+
+ --frame_bufs[cm->new_fb_idx].ref_count;
+
+ // Invalidate these references until the next frame starts.
+ for (ref_index = 0; ref_index < 3; ref_index++)
+ cm->frame_refs[ref_index].idx = -1;
+}
+
+static void release_fb_on_decoder_exit(VP9Decoder *pbi) {
+ const VPxWorkerInterface *const winterface = vpx_get_worker_interface();
+ VP9_COMMON *volatile const cm = &pbi->common;
+ BufferPool *volatile const pool = cm->buffer_pool;
+ RefCntBuffer *volatile const frame_bufs = cm->buffer_pool->frame_bufs;
+ int i;
+
+ // 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]);
+ }
+
+ // Release all the reference buffers if worker thread is holding them.
+ if (pbi->hold_ref_buf == 1) {
+ int ref_index = 0, mask;
+ for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
+ const int old_idx = cm->ref_frame_map[ref_index];
+ // Current thread releases the holding of reference frame.
+ decrease_ref_count(old_idx, frame_bufs, pool);
+
+ // Release the reference frame in reference map.
+ if (mask & 1) {
+ decrease_ref_count(old_idx, frame_bufs, pool);
+ }
+ ++ref_index;
+ }
+
+ // Current thread releases the holding of reference frame.
+ for (; ref_index < REF_FRAMES && !cm->show_existing_frame; ++ref_index) {
+ const int old_idx = cm->ref_frame_map[ref_index];
+ decrease_ref_count(old_idx, frame_bufs, pool);
+ }
+ pbi->hold_ref_buf = 0;
+ }
+}
+
+int vp9_receive_compressed_data(VP9Decoder *pbi, size_t size,
+ const uint8_t **psource) {
+ VP9_COMMON *volatile const cm = &pbi->common;
+ BufferPool *volatile const pool = cm->buffer_pool;
+ RefCntBuffer *volatile const frame_bufs = cm->buffer_pool->frame_bufs;
+ const uint8_t *source = *psource;
+ int retcode = 0;
+ cm->error.error_code = VPX_CODEC_OK;
+
+ if (size == 0) {
+ // 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.
+ if (cm->frame_refs[0].idx > 0) {
+ assert(cm->frame_refs[0].buf != NULL);
+ cm->frame_refs[0].buf->corrupted = 1;
+ }
+ }
+
+ pbi->ready_for_new_data = 0;
+
+ // Check if the previous frame was a frame without any references to it.
+ if (cm->new_fb_idx >= 0 && frame_bufs[cm->new_fb_idx].ref_count == 0 &&
+ !frame_bufs[cm->new_fb_idx].released) {
+ pool->release_fb_cb(pool->cb_priv,
+ &frame_bufs[cm->new_fb_idx].raw_frame_buffer);
+ frame_bufs[cm->new_fb_idx].released = 1;
+ }
+
+ // Find a free frame buffer. Return error if can not find any.
+ cm->new_fb_idx = get_free_fb(cm);
+ if (cm->new_fb_idx == INVALID_IDX) {
+ pbi->ready_for_new_data = 1;
+ release_fb_on_decoder_exit(pbi);
+ vpx_clear_system_state();
+ vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
+ "Unable to find free frame buffer");
+ return cm->error.error_code;
+ }
+
+ // Assign a MV array to the frame buffer.
+ cm->cur_frame = &pool->frame_bufs[cm->new_fb_idx];
+
+ pbi->hold_ref_buf = 0;
+ pbi->cur_buf = &frame_bufs[cm->new_fb_idx];
+
+ if (setjmp(cm->error.jmp)) {
+ cm->error.setjmp = 0;
+ pbi->ready_for_new_data = 1;
+ release_fb_on_decoder_exit(pbi);
+ // Release current frame.
+ decrease_ref_count(cm->new_fb_idx, frame_bufs, pool);
+ vpx_clear_system_state();
+ return -1;
+ }
+
+ cm->error.setjmp = 1;
+ vp9_decode_frame(pbi, source, source + size, psource);
+
+ swap_frame_buffers(pbi);
+
+ vpx_clear_system_state();
+
+ if (!cm->show_existing_frame) {
+ cm->last_show_frame = cm->show_frame;
+ cm->prev_frame = cm->cur_frame;
+ if (cm->seg.enabled) vp9_swap_current_and_last_seg_map(cm);
+ }
+
+ if (cm->show_frame) cm->cur_show_frame_fb_idx = cm->new_fb_idx;
+
+ // Update progress in frame parallel decode.
+ cm->last_width = cm->width;
+ cm->last_height = cm->height;
+ if (cm->show_frame) {
+ cm->current_video_frame++;
+ }
+
+ cm->error.setjmp = 0;
+ return retcode;
+}
+
+int vp9_get_raw_frame(VP9Decoder *pbi, YV12_BUFFER_CONFIG *sd,
+ vp9_ppflags_t *flags) {
+ VP9_COMMON *const cm = &pbi->common;
+ int ret = -1;
+#if !CONFIG_VP9_POSTPROC
+ (void)*flags;
+#endif
+
+ if (pbi->ready_for_new_data == 1) return ret;
+
+ pbi->ready_for_new_data = 1;
+
+ /* no raw frame to show!!! */
+ if (!cm->show_frame) return ret;
+
+ pbi->ready_for_new_data = 1;
+
+#if CONFIG_VP9_POSTPROC
+ if (!cm->show_existing_frame) {
+ ret = vp9_post_proc_frame(cm, sd, flags, cm->width);
+ } else {
+ *sd = *cm->frame_to_show;
+ ret = 0;
+ }
+#else
+ *sd = *cm->frame_to_show;
+ ret = 0;
+#endif /*!CONFIG_POSTPROC*/
+ vpx_clear_system_state();
+ return ret;
+}
+
+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 |= ((uint32_t)(*x++)) << (j * 8);
+ sizes[i] = this_sz;
+ }
+ *count = frames;
+ }
+ }
+ return VPX_CODEC_OK;
+}
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