avcodec: add a bsf to reorder DTS into PTS
Starting with an h264 implementation. Can be extended to support other codecs. A few caveats: - OpenGOP streams are currently not supported. The firt packet must be an IDR frame. - In some streams, a few frames at the end may not get a reordered PTS when they reference frames past EOS. The code added to derive timestamps from previous frames needs to extended. Addresses ticket #502. Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
parent
8f4b000c37
commit
b92e14147f
@ -16,6 +16,7 @@ version <next>:
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- LAF demuxer
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- APAC decoder and demuxer
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- Media 100i decoders
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- DTS to PTS reorder bsf
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version 5.1:
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1
configure
vendored
1
configure
vendored
@ -3284,6 +3284,7 @@ aac_adtstoasc_bsf_select="adts_header mpeg4audio"
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av1_frame_merge_bsf_select="cbs_av1"
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av1_frame_split_bsf_select="cbs_av1"
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av1_metadata_bsf_select="cbs_av1"
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dts2pts_bsf_select="cbs_h264 h264parse"
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eac3_core_bsf_select="ac3_parser"
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filter_units_bsf_select="cbs"
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h264_metadata_bsf_deps="const_nan"
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@ -1184,6 +1184,7 @@ OBJS-$(CONFIG_AV1_FRAME_SPLIT_BSF) += av1_frame_split_bsf.o
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OBJS-$(CONFIG_CHOMP_BSF) += chomp_bsf.o
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OBJS-$(CONFIG_DUMP_EXTRADATA_BSF) += dump_extradata_bsf.o
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OBJS-$(CONFIG_DCA_CORE_BSF) += dca_core_bsf.o
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OBJS-$(CONFIG_DTS2PTS_BSF) += dts2pts_bsf.o
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OBJS-$(CONFIG_DV_ERROR_MARKER_BSF) += dv_error_marker_bsf.o
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OBJS-$(CONFIG_EAC3_CORE_BSF) += eac3_core_bsf.o
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OBJS-$(CONFIG_EXTRACT_EXTRADATA_BSF) += extract_extradata_bsf.o \
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@ -31,6 +31,7 @@ extern const FFBitStreamFilter ff_av1_metadata_bsf;
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extern const FFBitStreamFilter ff_chomp_bsf;
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extern const FFBitStreamFilter ff_dump_extradata_bsf;
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extern const FFBitStreamFilter ff_dca_core_bsf;
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extern const FFBitStreamFilter ff_dts2pts_bsf;
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extern const FFBitStreamFilter ff_dv_error_marker_bsf;
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extern const FFBitStreamFilter ff_eac3_core_bsf;
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extern const FFBitStreamFilter ff_extract_extradata_bsf;
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535
libavcodec/dts2pts_bsf.c
Normal file
535
libavcodec/dts2pts_bsf.c
Normal file
@ -0,0 +1,535 @@
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/*
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* Copyright (c) 2022 James Almer
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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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* Derive PTS by reordering DTS from supported streams
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/fifo.h"
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#include "libavutil/tree.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_h264.h"
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#include "h264_parse.h"
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#include "h264_ps.h"
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typedef struct DTS2PTSNode {
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int64_t dts;
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int64_t duration;
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int poc;
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int gop;
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} DTS2PTSNode;
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typedef struct DTS2PTSFrame {
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AVPacket *pkt;
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int poc;
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int poc_diff;
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int gop;
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} DTS2PTSFrame;
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typedef struct DTS2PTSH264Context {
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H264POCContext poc;
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SPS sps;
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int poc_diff;
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int last_poc;
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int highest_poc;
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int picture_structure;
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} DTS2PTSH264Context;
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typedef struct DTS2PTSContext {
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struct AVTreeNode *root;
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AVFifo *fifo;
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// Codec specific function pointers and constants
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int (*init)(AVBSFContext *ctx);
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int (*filter)(AVBSFContext *ctx);
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void (*flush)(AVBSFContext *ctx);
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size_t fifo_size;
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CodedBitstreamContext *cbc;
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CodedBitstreamFragment au;
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union {
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DTS2PTSH264Context h264;
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} u;
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int nb_frame;
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int gop;
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int eof;
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} DTS2PTSContext;
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// AVTreeNode callbacks
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static int cmp_insert(const void *key, const void *node)
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{
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int ret = ((const DTS2PTSNode *)key)->poc - ((const DTS2PTSNode *)node)->poc;
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if (!ret)
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ret = ((const DTS2PTSNode *)key)->gop - ((const DTS2PTSNode *)node)->gop;
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return ret;
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}
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static int cmp_find(const void *key, const void *node)
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{
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int ret = ((const DTS2PTSFrame *)key)->poc - ((const DTS2PTSNode *) node)->poc;
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if (!ret)
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ret = ((const DTS2PTSFrame *)key)->gop - ((const DTS2PTSNode *) node)->gop;
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return ret;
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}
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static int dec_poc(void *opaque, void *elem)
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{
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DTS2PTSNode *node = elem;
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int dec = *(int *)opaque;
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node->poc -= dec;
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return 0;
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}
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static int free_node(void *opaque, void *elem)
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{
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DTS2PTSNode *node = elem;
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av_free(node);
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return 0;
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}
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// Shared functions
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static int alloc_and_insert_node(AVBSFContext *ctx, int64_t ts, int64_t duration,
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int poc, int poc_diff, int gop)
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{
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DTS2PTSContext *s = ctx->priv_data;
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for (int i = 0; i < poc_diff; i++) {
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struct AVTreeNode *node = av_tree_node_alloc();
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DTS2PTSNode *poc_node, *ret;
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if (!node)
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return AVERROR(ENOMEM);
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poc_node = av_malloc(sizeof(*poc_node));
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if (!poc_node) {
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av_free(node);
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return AVERROR(ENOMEM);
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}
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if (i && ts != AV_NOPTS_VALUE)
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ts += duration / poc_diff;
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*poc_node = (DTS2PTSNode) { ts, duration, poc++, gop };
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ret = av_tree_insert(&s->root, poc_node, cmp_insert, &node);
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if (ret && ret != poc_node) {
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*ret = *poc_node;
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av_free(poc_node);
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av_free(node);
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}
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}
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return 0;
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}
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// H.264
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static const CodedBitstreamUnitType h264_decompose_unit_types[] = {
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H264_NAL_SPS,
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H264_NAL_PPS,
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H264_NAL_IDR_SLICE,
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H264_NAL_SLICE,
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};
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static int h264_init(AVBSFContext *ctx)
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{
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DTS2PTSContext *s = ctx->priv_data;
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DTS2PTSH264Context *h264 = &s->u.h264;
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s->cbc->decompose_unit_types = h264_decompose_unit_types;
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s->cbc->nb_decompose_unit_types = FF_ARRAY_ELEMS(h264_decompose_unit_types);
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s->nb_frame = -(ctx->par_in->video_delay << 1);
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h264->last_poc = h264->highest_poc = INT_MIN;
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return 0;
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}
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static int get_mmco_reset(const H264RawSliceHeader *header)
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{
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if (header->nal_unit_header.nal_ref_idc == 0 ||
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!header->adaptive_ref_pic_marking_mode_flag)
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return 0;
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for (int i = 0; i < H264_MAX_MMCO_COUNT; i++) {
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if (header->mmco[i].memory_management_control_operation == 0)
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return 0;
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else if (header->mmco[i].memory_management_control_operation == 5)
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return 1;
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}
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return 0;
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}
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static int h264_queue_frame(AVBSFContext *ctx, AVPacket *pkt, int poc, int *queued)
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{
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DTS2PTSContext *s = ctx->priv_data;
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DTS2PTSH264Context *h264 = &s->u.h264;
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DTS2PTSFrame frame;
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int poc_diff, ret;
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poc_diff = (h264->picture_structure == 3) + 1;
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if (h264->sps.frame_mbs_only_flag && h264->poc_diff)
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poc_diff = FFMIN(poc_diff, h264->poc_diff);
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if (poc < 0) {
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av_tree_enumerate(s->root, &poc_diff, NULL, dec_poc);
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s->nb_frame -= poc_diff;
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}
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// Check if there was a POC reset (Like an IDR slice)
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if (s->nb_frame > h264->highest_poc) {
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s->nb_frame = 0;
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s->gop = (s->gop + 1) % s->fifo_size;
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h264->highest_poc = h264->last_poc;
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}
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ret = alloc_and_insert_node(ctx, pkt->dts, pkt->duration, s->nb_frame, poc_diff, s->gop);
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if (ret < 0)
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return ret;
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av_log(ctx, AV_LOG_DEBUG, "Queueing frame with POC %d, GOP %d, dts %"PRId64"\n",
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poc, s->gop, pkt->dts);
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s->nb_frame += poc_diff;
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// Add frame to output FIFO only once
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if (*queued)
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return 0;
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frame = (DTS2PTSFrame) { pkt, poc, poc_diff, s->gop };
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ret = av_fifo_write(s->fifo, &frame, 1);
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av_assert2(ret >= 0);
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*queued = 1;
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return 0;
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}
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static int h264_filter(AVBSFContext *ctx)
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{
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DTS2PTSContext *s = ctx->priv_data;
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DTS2PTSH264Context *h264 = &s->u.h264;
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CodedBitstreamFragment *au = &s->au;
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AVPacket *in;
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int output_picture_number = INT_MIN;
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int field_poc[2];
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int queued = 0, ret;
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ret = ff_bsf_get_packet(ctx, &in);
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if (ret < 0)
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return ret;
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ret = ff_cbs_read_packet(s->cbc, au, in);
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if (ret < 0) {
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av_log(ctx, AV_LOG_WARNING, "Failed to parse access unit.\n");
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goto fail;
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}
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for (int i = 0; i < au->nb_units; i++) {
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CodedBitstreamUnit *unit = &au->units[i];
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switch (unit->type) {
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case H264_NAL_IDR_SLICE:
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h264->poc.prev_frame_num = 0;
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h264->poc.prev_frame_num_offset = 0;
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h264->poc.prev_poc_msb =
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h264->poc.prev_poc_lsb = 0;
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// fall-through
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case H264_NAL_SLICE: {
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const H264RawSlice *slice = unit->content;
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const H264RawSliceHeader *header = &slice->header;
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const CodedBitstreamH264Context *cbs_h264 = s->cbc->priv_data;
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const H264RawSPS *sps = cbs_h264->active_sps;
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int got_reset;
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if (!sps) {
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av_log(ctx, AV_LOG_ERROR, "No active SPS for a slice\n");
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goto fail;
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}
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// Initialize the SPS struct with the fields ff_h264_init_poc() cares about
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h264->sps.frame_mbs_only_flag = sps->frame_mbs_only_flag;
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h264->sps.log2_max_frame_num = sps->log2_max_frame_num_minus4 + 4;
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h264->sps.poc_type = sps->pic_order_cnt_type;
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h264->sps.log2_max_poc_lsb = sps->log2_max_pic_order_cnt_lsb_minus4 + 4;
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h264->sps.offset_for_non_ref_pic = sps->offset_for_non_ref_pic;
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h264->sps.offset_for_top_to_bottom_field = sps->offset_for_top_to_bottom_field;
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h264->sps.poc_cycle_length = sps->num_ref_frames_in_pic_order_cnt_cycle;
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for (int i = 0; i < h264->sps.poc_cycle_length; i++)
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h264->sps.offset_for_ref_frame[i] = sps->offset_for_ref_frame[i];
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h264->picture_structure = sps->frame_mbs_only_flag ? 3 :
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(header->field_pic_flag ?
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header->field_pic_flag + header->bottom_field_flag : 3);
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h264->poc.frame_num = header->frame_num;
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h264->poc.poc_lsb = header->pic_order_cnt_lsb;
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h264->poc.delta_poc_bottom = header->delta_pic_order_cnt_bottom;
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h264->poc.delta_poc[0] = header->delta_pic_order_cnt[0];
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h264->poc.delta_poc[1] = header->delta_pic_order_cnt[1];
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field_poc[0] = field_poc[1] = INT_MAX;
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ret = ff_h264_init_poc(field_poc, &output_picture_number, &h264->sps,
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&h264->poc, h264->picture_structure,
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header->nal_unit_header.nal_ref_idc);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "ff_h264_init_poc() failure\n");
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goto fail;
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}
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got_reset = get_mmco_reset(header);
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h264->poc.prev_frame_num = got_reset ? 0 : h264->poc.frame_num;
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h264->poc.prev_frame_num_offset = got_reset ? 0 : h264->poc.frame_num_offset;
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if (header->nal_unit_header.nal_ref_idc != 0) {
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h264->poc.prev_poc_msb = got_reset ? 0 : h264->poc.poc_msb;
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if (got_reset)
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h264->poc.prev_poc_lsb = h264->picture_structure == 2 ? 0 : field_poc[0];
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else
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h264->poc.prev_poc_lsb = h264->poc.poc_lsb;
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}
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if (output_picture_number != h264->last_poc) {
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if (h264->last_poc != INT_MIN) {
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int diff = FFABS(h264->last_poc - output_picture_number);
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if ((output_picture_number < 0) && !h264->last_poc)
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h264->poc_diff = 0;
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else if (FFABS(output_picture_number) < h264->poc_diff) {
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diff = FFABS(output_picture_number);
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h264->poc_diff = 0;
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}
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if (!h264->poc_diff || (h264->poc_diff > diff)) {
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h264->poc_diff = diff;
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if (h264->poc_diff == 1 && h264->sps.frame_mbs_only_flag) {
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av_tree_enumerate(s->root, &h264->poc_diff, NULL, dec_poc);
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s->nb_frame -= 2;
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}
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}
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}
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h264->last_poc = output_picture_number;
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h264->highest_poc = FFMAX(h264->highest_poc, output_picture_number);
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ret = h264_queue_frame(ctx, in, output_picture_number, &queued);
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if (ret < 0)
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goto fail;
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}
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break;
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}
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default:
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break;
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}
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}
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if (output_picture_number == INT_MIN) {
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av_log(ctx, AV_LOG_ERROR, "No slices in access unit\n");
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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ret = 0;
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fail:
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ff_cbs_fragment_reset(au);
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if (!queued)
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av_packet_free(&in);
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return ret;
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}
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static void h264_flush(AVBSFContext *ctx)
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{
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DTS2PTSContext *s = ctx->priv_data;
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DTS2PTSH264Context *h264 = &s->u.h264;
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memset(&h264->sps, 0, sizeof(h264->sps));
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memset(&h264->poc, 0, sizeof(h264->poc));
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s->nb_frame = -(ctx->par_in->video_delay << 1);
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h264->last_poc = h264->highest_poc = INT_MIN;
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}
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// Core functions
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static const struct {
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enum AVCodecID id;
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int (*init)(AVBSFContext *ctx);
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int (*filter)(AVBSFContext *ctx);
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void (*flush)(AVBSFContext *ctx);
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size_t fifo_size;
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} func_tab[] = {
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{ AV_CODEC_ID_H264, h264_init, h264_filter, h264_flush, H264_MAX_DPB_FRAMES * 2 * 2 },
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};
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static int dts2pts_init(AVBSFContext *ctx)
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{
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DTS2PTSContext *s = ctx->priv_data;
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CodedBitstreamFragment *au = &s->au;
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int i, ret;
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for (i = 0; i < FF_ARRAY_ELEMS(func_tab); i++) {
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if (func_tab[i].id == ctx->par_in->codec_id) {
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s->init = func_tab[i].init;
|
||||
s->filter = func_tab[i].filter;
|
||||
s->flush = func_tab[i].flush;
|
||||
s->fifo_size = func_tab[i].fifo_size;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (i == FF_ARRAY_ELEMS(func_tab))
|
||||
return AVERROR_BUG;
|
||||
av_assert0(s->filter && s->fifo_size);
|
||||
|
||||
s->fifo = av_fifo_alloc2(s->fifo_size, sizeof(DTS2PTSFrame), 0);
|
||||
if (!s->fifo)
|
||||
return AVERROR(ENOMEM);
|
||||
|
||||
ret = ff_cbs_init(&s->cbc, ctx->par_in->codec_id, ctx);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (s->init) {
|
||||
ret = s->init(ctx);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (!ctx->par_in->extradata_size)
|
||||
return 0;
|
||||
|
||||
ret = ff_cbs_read_extradata(s->cbc, au, ctx->par_in);
|
||||
if (ret < 0)
|
||||
av_log(ctx, AV_LOG_WARNING, "Failed to parse extradata.\n");
|
||||
|
||||
ff_cbs_fragment_reset(au);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int dts2pts_filter(AVBSFContext *ctx, AVPacket *out)
|
||||
{
|
||||
DTS2PTSContext *s = ctx->priv_data;
|
||||
DTS2PTSNode *poc_node = NULL, *next[2] = { NULL, NULL };
|
||||
DTS2PTSFrame frame;
|
||||
int ret;
|
||||
|
||||
// Fill up the FIFO and POC tree
|
||||
while (!s->eof && av_fifo_can_write(s->fifo)) {
|
||||
ret = s->filter(ctx);
|
||||
if (ret < 0) {
|
||||
if (ret != AVERROR_EOF)
|
||||
return ret;
|
||||
s->eof = 1;
|
||||
}
|
||||
}
|
||||
|
||||
if (!av_fifo_can_read(s->fifo))
|
||||
return AVERROR_EOF;
|
||||
|
||||
// Fetch a packet from the FIFO
|
||||
ret = av_fifo_read(s->fifo, &frame, 1);
|
||||
av_assert2(ret >= 0);
|
||||
av_packet_move_ref(out, frame.pkt);
|
||||
av_packet_free(&frame.pkt);
|
||||
|
||||
// Search the timestamp for the requested POC and set PTS
|
||||
poc_node = av_tree_find(s->root, &frame, cmp_find, (void **)next);
|
||||
if (!poc_node) {
|
||||
poc_node = next[1];
|
||||
if (!poc_node || poc_node->poc != frame.poc)
|
||||
poc_node = next[0];
|
||||
}
|
||||
if (poc_node && poc_node->poc == frame.poc) {
|
||||
out->pts = poc_node->dts;
|
||||
if (!s->eof) {
|
||||
// Remove the found entry from the tree
|
||||
DTS2PTSFrame dup = (DTS2PTSFrame) { NULL, frame.poc + 1, frame.poc_diff, frame.gop };
|
||||
for (; dup.poc_diff > 0; dup.poc++, dup.poc_diff--) {
|
||||
struct AVTreeNode *node = NULL;
|
||||
if (!poc_node || poc_node->dts != out->pts)
|
||||
continue;
|
||||
av_tree_insert(&s->root, poc_node, cmp_insert, &node);
|
||||
av_free(poc_node);
|
||||
av_free(node);
|
||||
poc_node = av_tree_find(s->root, &dup, cmp_find, NULL);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
DTS2PTSFrame dup = (DTS2PTSFrame) { NULL, frame.poc - 1, frame.poc_diff, frame.gop };
|
||||
if (s->eof && (poc_node = av_tree_find(s->root, &dup, cmp_find, NULL)) && poc_node->poc == dup.poc) {
|
||||
out->pts = poc_node->dts;
|
||||
if (out->pts != AV_NOPTS_VALUE)
|
||||
out->pts += poc_node->duration;
|
||||
ret = alloc_and_insert_node(ctx, out->pts, out->duration,
|
||||
frame.poc, frame.poc_diff, frame.gop);
|
||||
if (ret < 0) {
|
||||
av_packet_unref(out);
|
||||
return ret;
|
||||
}
|
||||
if (!ret)
|
||||
av_log(ctx, AV_LOG_DEBUG, "Queueing frame for POC %d, GOP %d, dts %"PRId64", "
|
||||
"generated from POC %d, GOP %d, dts %"PRId64", duration %"PRId64"\n",
|
||||
frame.poc, frame.gop, out->pts,
|
||||
poc_node->poc, poc_node->gop, poc_node->dts, poc_node->duration);
|
||||
} else
|
||||
av_log(ctx, AV_LOG_WARNING, "No timestamp for POC %d in tree\n", frame.poc);
|
||||
}
|
||||
av_log(ctx, AV_LOG_DEBUG, "Returning frame for POC %d, GOP %d, dts %"PRId64", pts %"PRId64"\n",
|
||||
frame.poc, frame.gop, out->dts, out->pts);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void dts2pts_flush(AVBSFContext *ctx)
|
||||
{
|
||||
DTS2PTSContext *s = ctx->priv_data;
|
||||
DTS2PTSFrame frame;
|
||||
|
||||
if (s->flush)
|
||||
s->flush(ctx);
|
||||
s->eof = 0;
|
||||
s->gop = 0;
|
||||
|
||||
while (s->fifo && av_fifo_read(s->fifo, &frame, 1) >= 0)
|
||||
av_packet_free(&frame.pkt);
|
||||
|
||||
av_tree_enumerate(s->root, NULL, NULL, free_node);
|
||||
av_tree_destroy(s->root);
|
||||
s->root = NULL;
|
||||
|
||||
ff_cbs_fragment_reset(&s->au);
|
||||
ff_cbs_flush(s->cbc);
|
||||
}
|
||||
|
||||
static void dts2pts_close(AVBSFContext *ctx)
|
||||
{
|
||||
DTS2PTSContext *s = ctx->priv_data;
|
||||
|
||||
dts2pts_flush(ctx);
|
||||
|
||||
av_fifo_freep2(&s->fifo);
|
||||
ff_cbs_fragment_free(&s->au);
|
||||
ff_cbs_close(&s->cbc);
|
||||
}
|
||||
|
||||
static const enum AVCodecID dts2pts_codec_ids[] = {
|
||||
AV_CODEC_ID_H264,
|
||||
AV_CODEC_ID_NONE,
|
||||
};
|
||||
|
||||
const FFBitStreamFilter ff_dts2pts_bsf = {
|
||||
.p.name = "dts2pts",
|
||||
.p.codec_ids = dts2pts_codec_ids,
|
||||
.priv_data_size = sizeof(DTS2PTSContext),
|
||||
.init = dts2pts_init,
|
||||
.flush = dts2pts_flush,
|
||||
.close = dts2pts_close,
|
||||
.filter = dts2pts_filter,
|
||||
};
|
@ -29,7 +29,7 @@
|
||||
|
||||
#include "version_major.h"
|
||||
|
||||
#define LIBAVCODEC_VERSION_MINOR 49
|
||||
#define LIBAVCODEC_VERSION_MINOR 50
|
||||
#define LIBAVCODEC_VERSION_MICRO 100
|
||||
|
||||
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
|
||||
|
Loading…
x
Reference in New Issue
Block a user