485 lines
14 KiB
C
485 lines
14 KiB
C
/*
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* HEVC video Decoder
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*
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* Copyright (C) 2012 - 2013 Guillaume Martres
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* Copyright (C) 2012 - 2013 Gildas Cocherel
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "libavutil/pixdesc.h"
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#include "hevc.h"
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#include "internal.h"
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#include "thread.h"
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void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags)
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{
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/* frame->frame can be NULL if context init failed */
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if (!frame->frame || !frame->frame->buf[0])
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return;
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frame->flags &= ~flags;
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if (!frame->flags) {
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ff_thread_release_buffer(s->avctx, &frame->tf);
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av_buffer_unref(&frame->tab_mvf_buf);
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frame->tab_mvf = NULL;
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av_buffer_unref(&frame->rpl_buf);
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av_buffer_unref(&frame->rpl_tab_buf);
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frame->rpl_tab = NULL;
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frame->refPicList = NULL;
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frame->collocated_ref = NULL;
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}
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}
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RefPicList* ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *ref, int x0, int y0)
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{
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if (x0 < 0 || y0 < 0) {
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return s->ref->refPicList;
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} else {
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int x_cb = x0 >> s->sps->log2_ctb_size;
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int y_cb = y0 >> s->sps->log2_ctb_size;
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int pic_width_cb = (s->sps->width + (1<<s->sps->log2_ctb_size)-1 ) >> s->sps->log2_ctb_size;
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int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
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return (RefPicList*) ref->rpl_tab[ctb_addr_ts];
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}
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}
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void ff_hevc_clear_refs(HEVCContext *s)
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{
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
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ff_hevc_unref_frame(s, &s->DPB[i],
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HEVC_FRAME_FLAG_SHORT_REF | HEVC_FRAME_FLAG_LONG_REF);
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}
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void ff_hevc_flush_dpb(HEVCContext *s)
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{
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
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ff_hevc_unref_frame(s, &s->DPB[i], ~0);
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}
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static HEVCFrame *alloc_frame(HEVCContext *s)
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{
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int i, j, ret;
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
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HEVCFrame *frame = &s->DPB[i];
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if (frame->frame->buf[0])
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continue;
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ret = ff_thread_get_buffer(s->avctx, &frame->tf, AV_GET_BUFFER_FLAG_REF);
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if (ret < 0)
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return NULL;
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frame->rpl_buf = av_buffer_allocz(s->nb_nals * sizeof(RefPicListTab));
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if (!frame->rpl_buf)
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goto fail;
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frame->tab_mvf_buf = av_buffer_pool_get(s->tab_mvf_pool);
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if (!frame->tab_mvf_buf)
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goto fail;
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frame->tab_mvf = (MvField*)frame->tab_mvf_buf->data;
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frame->rpl_tab_buf = av_buffer_pool_get(s->rpl_tab_pool);
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if (!frame->rpl_tab_buf)
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goto fail;
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frame->rpl_tab = (RefPicListTab**)frame->rpl_tab_buf->data;
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frame->ctb_count = s->sps->ctb_width * s->sps->ctb_height;
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for (j = 0; j < frame->ctb_count; j++)
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frame->rpl_tab[j] = (RefPicListTab*)frame->rpl_buf->data;
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return frame;
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fail:
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ff_hevc_unref_frame(s, frame, ~0);
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return NULL;
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}
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av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n");
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return NULL;
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}
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int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
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{
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HEVCFrame *ref;
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int i;
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/* check that this POC doesn't already exist */
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
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HEVCFrame *frame = &s->DPB[i];
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if (frame->frame->buf[0] && frame->sequence == s->seq_decode &&
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frame->poc == poc) {
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av_log(s->avctx, AV_LOG_ERROR, "Duplicate POC in a sequence: %d.\n",
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poc);
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return AVERROR_INVALIDDATA;
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}
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}
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ref = alloc_frame(s);
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if (!ref)
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return AVERROR(ENOMEM);
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*frame = ref->frame;
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s->ref = ref;
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ref->poc = poc;
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ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
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ref->sequence = s->seq_decode;
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ref->window = s->sps->output_window;
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return 0;
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}
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int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
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{
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do {
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int nb_output = 0;
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int min_poc = INT_MAX;
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int i, j, min_idx, ret;
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
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HEVCFrame *frame = &s->DPB[i];
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if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) &&
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frame->sequence == s->seq_output) {
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nb_output++;
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if (frame->poc < min_poc) {
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min_poc = frame->poc;
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min_idx = i;
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}
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}
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}
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/* wait for more frames before output */
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if (!flush && s->seq_output == s->seq_decode && s->sps &&
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nb_output <= s->sps->temporal_layer[s->sps->max_sub_layers - 1].num_reorder_pics)
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return 0;
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if (nb_output) {
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HEVCFrame *frame = &s->DPB[min_idx];
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AVFrame *dst = out;
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AVFrame *src = frame->frame;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(src->format);
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int pixel_shift = !!(desc->comp[0].depth_minus1 > 7);
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ret = av_frame_ref(out, src);
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ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
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if (ret < 0)
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return ret;
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for (j = 0; j < 3; j++) {
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int hshift = (j > 0) ? desc->log2_chroma_w : 0;
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int vshift = (j > 0) ? desc->log2_chroma_h : 0;
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int off = ((frame->window.left_offset >> hshift) << pixel_shift) +
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(frame->window.top_offset >> vshift) * dst->linesize[j];
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dst->data[j] += off;
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}
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av_log(s->avctx, AV_LOG_DEBUG, "Output frame with POC %d.\n", frame->poc);
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return 1;
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}
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if (s->seq_output != s->seq_decode)
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s->seq_output = (s->seq_output + 1) & 0xff;
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else
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break;
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} while (1);
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return 0;
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}
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static int init_slice_rpl(HEVCContext *s)
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{
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HEVCFrame *frame = s->ref;
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int ctb_count = frame->ctb_count;
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int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr];
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int i;
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if (s->slice_idx >= frame->rpl_buf->size / sizeof(RefPicListTab))
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return AVERROR_INVALIDDATA;
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for (i = ctb_addr_ts; i < ctb_count; i++)
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frame->rpl_tab[i] = (RefPicListTab*)frame->rpl_buf->data + s->slice_idx;
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frame->refPicList = (RefPicList*)frame->rpl_tab[ctb_addr_ts];
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return 0;
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}
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int ff_hevc_slice_rpl(HEVCContext *s)
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{
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SliceHeader *sh = &s->sh;
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uint8_t nb_list = sh->slice_type == B_SLICE ? 2 : 1;
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uint8_t list_idx;
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int i, j, ret;
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ret = init_slice_rpl(s);
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if (ret < 0)
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return ret;
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if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs +
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s->rps[LT_CURR].nb_refs)) {
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av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n");
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return AVERROR_INVALIDDATA;
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}
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for (list_idx = 0; list_idx < nb_list; list_idx++) {
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RefPicList rpl_tmp = { { 0 } };
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RefPicList *rpl = &s->ref->refPicList[list_idx];
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/* The order of the elements is
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* ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and
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* ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1
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*/
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int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
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list_idx ? ST_CURR_BEF : ST_CURR_AFT,
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LT_CURR };
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/* concatenate the candidate lists for the current frame */
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while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) {
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for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) {
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RefPicList *rps = &s->rps[cand_lists[i]];
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for (j = 0; j < rps->nb_refs && rpl_tmp.nb_refs < MAX_REFS; j++) {
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rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j];
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rpl_tmp.ref[rpl_tmp.nb_refs] = rps->ref[j];
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rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = (i == 2);
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rpl_tmp.nb_refs++;
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}
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}
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}
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/* reorder the references if necessary */
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if (sh->rpl_modification_flag[list_idx]) {
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for (i = 0; i < sh->nb_refs[list_idx]; i++) {
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int idx = sh->list_entry_lx[list_idx][i];
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if (idx >= rpl_tmp.nb_refs) {
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av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n");
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return AVERROR_INVALIDDATA;
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}
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rpl->list[i] = rpl_tmp.list[idx];
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rpl->ref[i] = rpl_tmp.ref[idx];
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rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx];
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rpl->nb_refs++;
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}
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} else {
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memcpy(rpl, &rpl_tmp, sizeof(*rpl));
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rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]);
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}
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if (sh->collocated_list == list_idx &&
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sh->collocated_ref_idx < rpl->nb_refs)
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s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
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}
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return 0;
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}
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static HEVCFrame *find_ref_idx(HEVCContext *s, int poc)
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{
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int i;
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int LtMask = (1 << s->sps->log2_max_poc_lsb) - 1;
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
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HEVCFrame *ref = &s->DPB[i];
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if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
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if ((ref->poc & LtMask) == poc)
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return ref;
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}
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}
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
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HEVCFrame *ref = &s->DPB[i];
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if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
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if (ref->poc == poc || (ref->poc & LtMask) == poc)
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return ref;
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}
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}
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av_log(s->avctx, AV_LOG_ERROR,
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"Could not find ref with POC %d\n", poc);
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return NULL;
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}
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static void mark_ref(HEVCFrame *frame, int flag)
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{
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frame->flags &= ~(HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF);
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frame->flags |= flag;
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}
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static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc)
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{
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HEVCFrame *frame;
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int i, x, y;
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frame = alloc_frame(s);
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if (!frame)
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return NULL;
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if (!s->sps->pixel_shift) {
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for (i = 0; frame->frame->buf[i]; i++)
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memset(frame->frame->buf[i]->data, 1 << (s->sps->bit_depth - 1),
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frame->frame->buf[i]->size);
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} else {
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for (i = 0; frame->frame->data[i]; i++)
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for (y = 0; y < (s->sps->height >> s->sps->vshift[i]); y++)
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for (x = 0; x < (s->sps->width >> s->sps->hshift[i]); x++) {
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AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x,
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1 << (s->sps->bit_depth - 1));
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}
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}
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frame->poc = poc;
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frame->sequence = s->seq_decode;
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frame->flags = 0;
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if (s->threads_type == FF_THREAD_FRAME)
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ff_thread_report_progress(&frame->tf, INT_MAX, 0);
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return frame;
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}
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/* add a reference with the given poc to the list and mark it as used in DPB */
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static int add_candidate_ref(HEVCContext *s, RefPicList *list,
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int poc, int ref_flag)
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{
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HEVCFrame *ref = find_ref_idx(s, poc);
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if (ref == s->ref)
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return AVERROR_INVALIDDATA;
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if (!ref) {
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ref = generate_missing_ref(s, poc);
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if (!ref)
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return AVERROR(ENOMEM);
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}
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list->list[list->nb_refs] = ref->poc;
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list->ref[list->nb_refs] = ref;
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list->nb_refs++;
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mark_ref(ref, ref_flag);
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return 0;
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}
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int ff_hevc_frame_rps(HEVCContext *s)
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{
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const ShortTermRPS *short_rps = s->sh.short_term_rps;
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const LongTermRPS *long_rps = &s->sh.long_term_rps;
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RefPicList *rps = s->rps;
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int i, ret;
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if (!short_rps) {
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rps[0].nb_refs = rps[1].nb_refs = 0;
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return 0;
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}
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/* clear the reference flags on all frames except the current one */
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
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HEVCFrame *frame = &s->DPB[i];
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if (frame == s->ref)
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continue;
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mark_ref(frame, 0);
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}
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for (i = 0; i < NB_RPS_TYPE; i++)
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rps[i].nb_refs = 0;
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/* add the short refs */
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for (i = 0; i < short_rps->num_delta_pocs; i++) {
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int poc = s->poc + short_rps->delta_poc[i];
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int list;
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if (!short_rps->used[i])
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list = ST_FOLL;
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else if (i < short_rps->num_negative_pics)
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list = ST_CURR_BEF;
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else
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list = ST_CURR_AFT;
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ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF);
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if (ret < 0)
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return ret;
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}
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/* add the long refs */
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for (i = 0; i < long_rps->nb_refs; i++) {
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int poc = long_rps->poc[i];
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int list = long_rps->used[i] ? LT_CURR : LT_FOLL;
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ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF);
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if (ret < 0)
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return ret;
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}
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/* release any frames that are now unused */
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for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
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ff_hevc_unref_frame(s, &s->DPB[i], 0);
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return 0;
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}
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int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb)
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{
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int max_poc_lsb = 1 << s->sps->log2_max_poc_lsb;
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int prev_poc_lsb = s->pocTid0 % max_poc_lsb;
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int prev_poc_msb = s->pocTid0 - prev_poc_lsb;
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int poc_msb;
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if ((poc_lsb < prev_poc_lsb) && ((prev_poc_lsb - poc_lsb) >= max_poc_lsb / 2))
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poc_msb = prev_poc_msb + max_poc_lsb;
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else if ((poc_lsb > prev_poc_lsb) && ((poc_lsb - prev_poc_lsb) > (max_poc_lsb / 2)))
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poc_msb = prev_poc_msb - max_poc_lsb;
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else
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poc_msb = prev_poc_msb;
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// For BLA picture types, POCmsb is set to 0.
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if (s->nal_unit_type == NAL_BLA_W_LP ||
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s->nal_unit_type == NAL_BLA_W_RADL ||
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s->nal_unit_type == NAL_BLA_N_LP)
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poc_msb = 0;
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return poc_msb + poc_lsb;
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}
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int ff_hevc_frame_nb_refs(HEVCContext *s)
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|
{
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|
int ret = 0;
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int i;
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const ShortTermRPS *rps = s->sh.short_term_rps;
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LongTermRPS *long_rps = &s->sh.long_term_rps;
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|
|
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if (rps) {
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for (i = 0; i < rps->num_negative_pics; i++)
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ret += !!rps->used[i];
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|
for (; i < rps->num_delta_pocs; i++)
|
|
ret += !!rps->used[i];
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}
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|
|
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if (long_rps) {
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|
for (i = 0; i < long_rps->nb_refs; i++)
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ret += !!long_rps->used[i];
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|
}
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return ret;
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}
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