lavc: add a HEVC decoder.

Initially written by Guillaume Martres <smarter@ubuntu.com> as a GSoC
project. Further contributions by the OpenHEVC project and other
developers, namely:

Mickaël Raulet <mraulet@insa-rennes.fr>
Seppo Tomperi <seppo.tomperi@vtt.fi>
Gildas Cocherel <gildas.cocherel@laposte.net>
Khaled Jerbi <khaled_jerbi@yahoo.fr>
Wassim Hamidouche <wassim.hamidouche@insa-rennes.fr>
Vittorio Giovara <vittorio.giovara@gmail.com>
Jan Ekström <jeebjp@gmail.com>
Anton Khirnov <anton@khirnov.net>
Martin Storsjö <martin@martin.st>
Luca Barbato <lu_zero@gentoo.org>
Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 481 insertions, 0 deletions

diff --git a/libavcodec/hevc_refs.c b/libavcodec/hevc_refs.c
new file mode 100644
index 0000000000..9de13359d8
--- /dev/null
+++ b/libavcodec/hevc_refs.c
@@ -0,0 +1,481 @@
+/*
+ * HEVC video Decoder
+ *
+ * Copyright (C) 2012 - 2013 Guillaume Martres
+ * Copyright (C) 2012 - 2013 Gildas Cocherel
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/pixdesc.h"
+
+#include "hevc.h"
+#include "internal.h"
+#include "thread.h"
+
+void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags)
+{
+    /* frame->frame can be NULL if context init failed */
+    if (!frame->frame || !frame->frame->buf[0])
+        return;
+
+    frame->flags &= ~flags;
+    if (!frame->flags) {
+        ff_thread_release_buffer(s->avctx, &frame->tf);
+
+        av_buffer_unref(&frame->tab_mvf_buf);
+        frame->tab_mvf = NULL;
+
+        av_buffer_unref(&frame->rpl_buf);
+        av_buffer_unref(&frame->rpl_tab_buf);
+        frame->rpl_tab    = NULL;
+        frame->refPicList = NULL;
+
+        frame->collocated_ref = NULL;
+    }
+}
+
+RefPicList* ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *ref, int x0, int y0)
+{
+    if (x0 < 0 || y0 < 0) {
+        return s->ref->refPicList;
+    } else {
+        int x_cb         = x0 >> s->sps->log2_ctb_size;
+        int y_cb         = y0 >> s->sps->log2_ctb_size;
+        int pic_width_cb = (s->sps->width + (1<<s->sps->log2_ctb_size)-1 ) >> s->sps->log2_ctb_size;
+        int ctb_addr_ts  = s->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
+        return (RefPicList*) ref->rpl_tab[ctb_addr_ts];
+    }
+}
+
+void ff_hevc_clear_refs(HEVCContext *s)
+{
+    int i;
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
+        ff_hevc_unref_frame(s, &s->DPB[i],
+                            HEVC_FRAME_FLAG_SHORT_REF | HEVC_FRAME_FLAG_LONG_REF);
+}
+
+void ff_hevc_flush_dpb(HEVCContext *s)
+{
+    int i;
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
+        ff_hevc_unref_frame(s, &s->DPB[i], ~0);
+}
+
+static HEVCFrame *alloc_frame(HEVCContext *s)
+{
+    int i, j, ret;
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
+        HEVCFrame *frame = &s->DPB[i];
+        if (frame->frame->buf[0])
+            continue;
+
+        ret = ff_thread_get_buffer(s->avctx, &frame->tf, AV_GET_BUFFER_FLAG_REF);
+        if (ret < 0)
+            return NULL;
+
+        frame->rpl_buf = av_buffer_allocz(s->nb_nals * sizeof(RefPicListTab));
+        if (!frame->rpl_buf)
+            goto fail;
+
+        frame->tab_mvf_buf = av_buffer_pool_get(s->tab_mvf_pool);
+        if (!frame->tab_mvf_buf)
+            goto fail;
+        frame->tab_mvf = (MvField*)frame->tab_mvf_buf->data;
+
+        frame->rpl_tab_buf = av_buffer_pool_get(s->rpl_tab_pool);
+        if (!frame->rpl_tab_buf)
+            goto fail;
+        frame->rpl_tab   = (RefPicListTab**)frame->rpl_tab_buf->data;
+        frame->ctb_count = s->sps->ctb_width * s->sps->ctb_height;
+        for (j = 0; j < frame->ctb_count; j++)
+            frame->rpl_tab[j] = (RefPicListTab*)frame->rpl_buf->data;
+
+        return frame;
+fail:
+        ff_hevc_unref_frame(s, frame, ~0);
+        return NULL;
+    }
+    av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n");
+    return NULL;
+}
+
+int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
+{
+    HEVCFrame *ref;
+    int i;
+
+    /* check that this POC doesn't already exist */
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
+        HEVCFrame *frame = &s->DPB[i];
+
+        if (frame->frame->buf[0] && frame->sequence == s->seq_decode &&
+            frame->poc == poc) {
+            av_log(s->avctx, AV_LOG_ERROR, "Duplicate POC in a sequence: %d.\n",
+                   poc);
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    ref = alloc_frame(s);
+    if (!ref)
+        return AVERROR(ENOMEM);
+
+    *frame              = ref->frame;
+    s->ref              = ref;
+    ref->poc            = poc;
+
+    ref->flags          = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
+    ref->sequence       = s->seq_decode;
+    ref->window         = s->sps->output_window;
+
+    return 0;
+}
+
+int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
+{
+    int nb_output = 0;
+    int min_poc   = 0xFFFF;
+    int i, j, min_idx, ret;
+
+    do {
+        for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
+            HEVCFrame *frame = &s->DPB[i];
+            if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) &&
+                frame->sequence == s->seq_output) {
+                nb_output++;
+                if (frame->poc < min_poc) {
+                    min_poc = frame->poc;
+                    min_idx = i;
+                }
+            }
+        }
+
+        /* wait for more frames before output */
+        if (!flush && s->seq_output == s->seq_decode && s->sps &&
+            nb_output <= s->sps->temporal_layer[s->temporal_id].num_reorder_pics)
+            return 0;
+
+        if (nb_output) {
+            HEVCFrame *frame = &s->DPB[min_idx];
+            AVFrame *dst = out;
+            AVFrame *src = frame->frame;
+            const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(src->format);
+            int pixel_shift = !!(desc->comp[0].depth_minus1 > 7);
+
+            ret = av_frame_ref(out, src);
+            ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
+            if (ret < 0)
+                return ret;
+
+            for (j = 0; j < 3; j++) {
+                int hshift = (i > 0) ? desc->log2_chroma_w : 0;
+                int vshift = (i > 0) ? desc->log2_chroma_h : 0;
+                int off = ((frame->window.left_offset >> hshift) << pixel_shift) +
+                          (frame->window.top_offset   >> vshift) * dst->linesize[j];
+                dst->data[j] += off;
+            }
+            av_log(s->avctx, AV_LOG_DEBUG, "Output frame with POC %d.\n", frame->poc);
+            return 1;
+        }
+
+        if (s->seq_output != s->seq_decode)
+            s->seq_output = (s->seq_output + 1) & 0xff;
+        else
+            break;
+    } while (1);
+
+    return 0;
+}
+
+static int init_slice_rpl(HEVCContext *s)
+{
+    HEVCFrame *frame = s->ref;
+    int ctb_count   = frame->ctb_count;
+    int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr];
+    int i;
+
+    if (s->slice_idx >= frame->rpl_buf->size / sizeof(RefPicListTab))
+        return AVERROR_INVALIDDATA;
+
+    for (i = ctb_addr_ts; i < ctb_count; i++)
+        frame->rpl_tab[i] = (RefPicListTab*)frame->rpl_buf->data + s->slice_idx;
+
+    frame->refPicList = (RefPicList*)frame->rpl_tab[ctb_addr_ts];
+
+    return 0;
+}
+
+int ff_hevc_slice_rpl(HEVCContext *s)
+{
+    SliceHeader *sh = &s->sh;
+
+        uint8_t nb_list = sh->slice_type == B_SLICE ? 2 : 1;
+    uint8_t list_idx;
+    int i, j, ret;
+
+    ret = init_slice_rpl(s);
+    if (ret < 0)
+        return ret;
+
+    if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs +
+          s->rps[LT_CURR].nb_refs)) {
+        av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    for (list_idx = 0; list_idx < nb_list; list_idx++) {
+        RefPicList  rpl_tmp = { { 0 } };
+        RefPicList *rpl     = &s->ref->refPicList[list_idx];
+
+        /* The order of the elements is
+         * ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and
+         * ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1
+         */
+        int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
+                              list_idx ? ST_CURR_BEF : ST_CURR_AFT,
+                              LT_CURR };
+
+        /* concatenate the candidate lists for the current frame */
+        while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) {
+            for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) {
+                RefPicList *rps = &s->rps[cand_lists[i]];
+                for (j = 0; j < rps->nb_refs; j++) {
+                    rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j];
+                    rpl_tmp.ref[rpl_tmp.nb_refs]  = rps->ref[j];
+                    rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = (i == 2);
+                    rpl_tmp.nb_refs++;
+                }
+            }
+        }
+
+        /* reorder the references if necessary */
+        if (sh->rpl_modification_flag[list_idx]) {
+            for (i = 0; i < sh->nb_refs[list_idx]; i++) {
+                int idx = sh->list_entry_lx[list_idx][i];
+
+                if (idx >= rpl_tmp.nb_refs) {
+                    av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n");
+                    return AVERROR_INVALIDDATA;
+                }
+
+                rpl->list[i]       = rpl_tmp.list[idx];
+                rpl->ref[i]        = rpl_tmp.ref[idx];
+                rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx];
+                rpl->nb_refs++;
+            }
+        } else {
+            memcpy(rpl, &rpl_tmp, sizeof(*rpl));
+            rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]);
+        }
+
+        if (sh->collocated_list == list_idx &&
+            sh->collocated_ref_idx < rpl->nb_refs)
+            s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
+    }
+
+    return 0;
+}
+
+static HEVCFrame *find_ref_idx(HEVCContext *s, int poc)
+{
+    int i;
+    int LtMask = (1 << s->sps->log2_max_poc_lsb) - 1;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
+        HEVCFrame *ref = &s->DPB[i];
+        if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
+            if ((ref->poc & LtMask) == poc)
+                    return ref;
+            }
+    }
+
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
+        HEVCFrame *ref = &s->DPB[i];
+        if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
+            if (ref->poc == poc || (ref->poc & LtMask) == poc)
+                    return ref;
+            }
+    }
+
+    av_log(s->avctx, AV_LOG_ERROR,
+           "Could not find ref with POC %d\n", poc);
+    return NULL;
+}
+
+static void mark_ref(HEVCFrame *frame, int flag)
+{
+    frame->flags &= ~(HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF);
+    frame->flags |= flag;
+}
+
+static HEVCFrame *generate_missing_ref(HEVCContext *s, int poc)
+{
+    HEVCFrame *frame;
+    int i, x, y;
+
+
+    frame = alloc_frame(s);
+    if (!frame)
+        return NULL;
+
+    if (!s->sps->pixel_shift) {
+        for (i = 0; frame->frame->buf[i]; i++)
+             memset(frame->frame->buf[i]->data, 1 << (s->sps->bit_depth - 1),
+                    frame->frame->buf[i]->size);
+    } else {
+        for (i = 0; frame->frame->data[i]; i++)
+            for (y = 0; y < (s->height >> s->sps->vshift[i]); y++)
+                for (x = 0; x < (s->width >> s->sps->hshift[i]); x++) {
+                    AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x,
+                            1 << (s->sps->bit_depth - 1));
+                }
+    }
+
+    frame->poc      = poc;
+    frame->sequence = s->seq_decode;
+    frame->flags    = 0;
+
+    ff_thread_report_progress(&frame->tf, INT_MAX, 0);
+
+    return frame;
+}
+
+/* add a reference with the given poc to the list and mark it as used in DPB */
+static int add_candidate_ref(HEVCContext *s, RefPicList *list,
+                             int poc, int ref_flag)
+{
+    HEVCFrame *ref = find_ref_idx(s, poc);
+
+    if (ref == s->ref)
+        return AVERROR_INVALIDDATA;
+
+    if (!ref) {
+        ref = generate_missing_ref(s, poc);
+        if (!ref)
+            return AVERROR(ENOMEM);
+    }
+
+    list->list[list->nb_refs] = ref->poc;
+    list->ref[list->nb_refs]  = ref;
+    list->nb_refs++;
+
+    mark_ref(ref, ref_flag);
+    return 0;
+}
+
+int ff_hevc_frame_rps(HEVCContext *s)
+{
+    const ShortTermRPS *short_rps = s->sh.short_term_rps;
+    const LongTermRPS  *long_rps  = &s->sh.long_term_rps;
+    RefPicList               *rps = s->rps;
+    int i, ret;
+
+    if (!short_rps)
+        return 0;
+
+    /* clear the reference flags on all frames except the current one */
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
+        HEVCFrame *frame = &s->DPB[i];
+
+        if (frame == s->ref)
+            continue;
+
+        mark_ref(frame, 0);
+    }
+
+    for (i = 0; i < NB_RPS_TYPE; i++)
+        rps[i].nb_refs = 0;
+
+    /* add the short refs */
+    for (i = 0; i < short_rps->num_delta_pocs; i++) {
+        int poc = s->poc + short_rps->delta_poc[i];
+        int list;
+
+        if (!short_rps->used[i])
+            list = ST_FOLL;
+        else if (i < short_rps->num_negative_pics)
+            list = ST_CURR_BEF;
+        else
+            list = ST_CURR_AFT;
+
+        ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF);
+        if (ret < 0)
+            return ret;
+    }
+
+    /* add the long refs */
+    for (i = 0; i < long_rps->nb_refs; i++) {
+        int poc  = long_rps->poc[i];
+        int list = long_rps->used[i] ? LT_CURR : LT_FOLL;
+
+        ret = add_candidate_ref(s, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF);
+        if (ret < 0)
+            return ret;
+    }
+
+    /* release any frames that are now unused */
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
+        ff_hevc_unref_frame(s, &s->DPB[i], 0);
+
+    return 0;
+}
+
+int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb)
+{
+    int max_poc_lsb  = 1 << s->sps->log2_max_poc_lsb;
+    int prev_poc_lsb = s->pocTid0 % max_poc_lsb;
+    int prev_poc_msb = s->pocTid0 - prev_poc_lsb;
+    int poc_msb;
+
+    if ((poc_lsb < prev_poc_lsb) && ((prev_poc_lsb - poc_lsb) >= max_poc_lsb / 2))
+        poc_msb = prev_poc_msb + max_poc_lsb;
+    else if ((poc_lsb > prev_poc_lsb) && ((poc_lsb - prev_poc_lsb) > (max_poc_lsb / 2)))
+        poc_msb = prev_poc_msb - max_poc_lsb;
+    else
+        poc_msb = prev_poc_msb;
+
+    // For BLA picture types, POCmsb is set to 0.
+    if (s->nal_unit_type == NAL_BLA_W_LP ||
+        s->nal_unit_type == NAL_BLA_W_RADL ||
+        s->nal_unit_type == NAL_BLA_N_LP)
+        poc_msb = 0;
+
+    return poc_msb + poc_lsb;
+}
+
+int ff_hevc_frame_nb_refs(HEVCContext *s)
+{
+    int ret = 0;
+    int i;
+    const ShortTermRPS *rps = s->sh.short_term_rps;
+    LongTermRPS *long_rps   = &s->sh.long_term_rps;
+
+    if (rps) {
+        for (i = 0; i < rps->num_negative_pics; i++)
+            ret += !!rps->used[i];
+        for (; i < rps->num_delta_pocs; i++)
+            ret += !!rps->used[i];
+    }
+
+    if (long_rps) {
+        for (i = 0; i < long_rps->nb_refs; i++)
+            ret += !!long_rps->used[i];
+    }
+    return ret;
+}