262 lines
8.2 KiB
C
262 lines
8.2 KiB
C
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/*
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* Copyright (c) 2019 James Almer <jamrial@gmail.com>
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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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/**
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* @file
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* This bitstream filter splits AV1 Temporal Units into packets containing
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* just one frame, plus any leading and trailing OBUs that may be present at
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* the beginning or end, respectively.
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*
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* Temporal Units already containing only one frame will be passed through
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* unchanged. When splitting can't be performed, the Temporal Unit will be
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* passed through containing only the remaining OBUs starting from the first
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* one after the last successfully split frame.
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*/
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#include "libavutil/avassert.h"
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#include "bsf.h"
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#include "bsf_internal.h"
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#include "cbs.h"
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#include "cbs_av1.h"
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typedef struct AV1FSplitContext {
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AVPacket *buffer_pkt;
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CodedBitstreamContext *cbc;
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CodedBitstreamFragment temporal_unit;
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int nb_frames;
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int cur_frame;
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int cur_frame_idx;
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int last_frame_idx;
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} AV1FSplitContext;
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static int av1_frame_split_filter(AVBSFContext *ctx, AVPacket *out)
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{
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AV1FSplitContext *s = ctx->priv_data;
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CodedBitstreamFragment *td = &s->temporal_unit;
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int i, ret;
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int split = !!s->buffer_pkt->data;
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if (!s->buffer_pkt->data) {
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int nb_frames = 0;
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ret = ff_bsf_get_packet_ref(ctx, s->buffer_pkt);
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if (ret < 0)
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return ret;
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ret = ff_cbs_read_packet(s->cbc, td, s->buffer_pkt);
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if (ret < 0) {
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av_log(ctx, AV_LOG_WARNING, "Failed to parse temporal unit.\n");
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goto passthrough;
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}
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for (i = 0; i < td->nb_units; i++) {
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CodedBitstreamUnit *unit = &td->units[i];
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if (unit->type == AV1_OBU_FRAME ||
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unit->type == AV1_OBU_FRAME_HEADER)
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nb_frames++;
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else if (unit->type == AV1_OBU_TILE_LIST) {
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av_log(ctx, AV_LOG_VERBOSE, "Large scale tiles are unsupported.\n");
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goto passthrough;
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}
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}
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if (nb_frames > 1) {
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s->cur_frame = 0;
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s->cur_frame_idx = s->last_frame_idx = 0;
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s->nb_frames = nb_frames;
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split = 1;
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}
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}
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if (split) {
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AV1RawFrameHeader *frame = NULL;
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int cur_frame_type = -1, size = 0;
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for (i = s->cur_frame_idx; i < td->nb_units; i++) {
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CodedBitstreamUnit *unit = &td->units[i];
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size += unit->data_size;
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if (unit->type == AV1_OBU_FRAME) {
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AV1RawOBU *obu = unit->content;
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if (frame) {
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av_log(ctx, AV_LOG_WARNING, "Frame OBU found when Tile data for a "
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"previous frame was expected.\n");
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goto passthrough;
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}
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frame = &obu->obu.frame.header;
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cur_frame_type = obu->header.obu_type;
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s->last_frame_idx = s->cur_frame_idx;
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s->cur_frame_idx = i + 1;
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s->cur_frame++;
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// split here unless it's the last frame, in which case
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// include every trailing OBU
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if (s->cur_frame < s->nb_frames)
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break;
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} else if (unit->type == AV1_OBU_FRAME_HEADER) {
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AV1RawOBU *obu = unit->content;
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if (frame) {
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av_log(ctx, AV_LOG_WARNING, "Frame Header OBU found when Tile data for a "
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"previous frame was expected.\n");
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goto passthrough;
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}
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frame = &obu->obu.frame_header;
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cur_frame_type = obu->header.obu_type;
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s->last_frame_idx = s->cur_frame_idx;
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s->cur_frame++;
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// split here if show_existing_frame unless it's the last
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// frame, in which case include every trailing OBU
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if (frame->show_existing_frame &&
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s->cur_frame < s->nb_frames) {
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s->cur_frame_idx = i + 1;
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break;
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}
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} else if (unit->type == AV1_OBU_TILE_GROUP) {
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AV1RawOBU *obu = unit->content;
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AV1RawTileGroup *group = &obu->obu.tile_group;
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if (!frame || cur_frame_type != AV1_OBU_FRAME_HEADER) {
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av_log(ctx, AV_LOG_WARNING, "Unexpected Tile Group OBU found before a "
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"Frame Header.\n");
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goto passthrough;
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}
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if ((group->tg_end == (frame->tile_cols * frame->tile_rows) - 1) &&
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// include every trailing OBU with the last frame
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s->cur_frame < s->nb_frames) {
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s->cur_frame_idx = i + 1;
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break;
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}
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}
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}
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av_assert0(frame && s->cur_frame <= s->nb_frames);
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ret = av_packet_ref(out, s->buffer_pkt);
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if (ret < 0)
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goto fail;
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out->data = (uint8_t *)td->units[s->last_frame_idx].data;
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out->size = size;
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// skip the frame in the buffer packet if it's split successfully, so it's not present
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// if the packet is passed through in case of failure when splitting another frame.
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s->buffer_pkt->data += size;
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s->buffer_pkt->size -= size;
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if (!frame->show_existing_frame && !frame->show_frame)
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out->pts = AV_NOPTS_VALUE;
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if (s->cur_frame == s->nb_frames) {
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av_packet_unref(s->buffer_pkt);
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ff_cbs_fragment_reset(s->cbc, td);
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}
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return 0;
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}
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passthrough:
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av_packet_move_ref(out, s->buffer_pkt);
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ret = 0;
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fail:
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if (ret < 0) {
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av_packet_unref(out);
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av_packet_unref(s->buffer_pkt);
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}
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ff_cbs_fragment_reset(s->cbc, td);
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return ret;
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}
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static const CodedBitstreamUnitType decompose_unit_types[] = {
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AV1_OBU_TEMPORAL_DELIMITER,
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AV1_OBU_SEQUENCE_HEADER,
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AV1_OBU_FRAME_HEADER,
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AV1_OBU_TILE_GROUP,
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AV1_OBU_FRAME,
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};
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static int av1_frame_split_init(AVBSFContext *ctx)
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{
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AV1FSplitContext *s = ctx->priv_data;
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CodedBitstreamFragment *td = &s->temporal_unit;
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int ret;
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s->buffer_pkt = av_packet_alloc();
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if (!s->buffer_pkt)
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return AVERROR(ENOMEM);
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ret = ff_cbs_init(&s->cbc, AV_CODEC_ID_AV1, ctx);
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if (ret < 0)
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return ret;
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s->cbc->decompose_unit_types = (CodedBitstreamUnitType*)decompose_unit_types;
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s->cbc->nb_decompose_unit_types = FF_ARRAY_ELEMS(decompose_unit_types);
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if (!ctx->par_in->extradata_size)
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return 0;
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ret = ff_cbs_read_extradata(s->cbc, td, ctx->par_in);
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if (ret < 0)
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av_log(ctx, AV_LOG_WARNING, "Failed to parse extradata.\n");
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ff_cbs_fragment_reset(s->cbc, td);
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return 0;
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}
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static void av1_frame_split_flush(AVBSFContext *ctx)
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{
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AV1FSplitContext *s = ctx->priv_data;
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av_packet_unref(s->buffer_pkt);
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ff_cbs_fragment_reset(s->cbc, &s->temporal_unit);
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}
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static void av1_frame_split_close(AVBSFContext *ctx)
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{
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AV1FSplitContext *s = ctx->priv_data;
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av_packet_free(&s->buffer_pkt);
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ff_cbs_fragment_free(s->cbc, &s->temporal_unit);
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ff_cbs_close(&s->cbc);
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}
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static const enum AVCodecID av1_frame_split_codec_ids[] = {
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AV_CODEC_ID_AV1, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_av1_frame_split_bsf = {
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.name = "av1_frame_split",
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.priv_data_size = sizeof(AV1FSplitContext),
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.init = av1_frame_split_init,
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.flush = av1_frame_split_flush,
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.close = av1_frame_split_close,
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.filter = av1_frame_split_filter,
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.codec_ids = av1_frame_split_codec_ids,
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};
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