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cbs: Implement common parts of cbs-based bitstream filters separately 

This allows removal of a lot of duplicated code between BSFs.
This commit is contained in:
Mark Thompson 2021-01-01 21:35:17 +00:00
parent c9c5b1977f
commit 01a68c12a7
3 changed files with 291 additions and 1 deletions
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2
libavcodec/Makefile
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@ -69,7 +69,7 @@ OBJS-$(CONFIG_AUDIODSP) += audiodsp.o
OBJS-$(CONFIG_BLOCKDSP) += blockdsp.o
OBJS-$(CONFIG_BSWAPDSP) += bswapdsp.o
OBJS-$(CONFIG_CABAC) += cabac.o
OBJS-$(CONFIG_CBS) += cbs.o
OBJS-$(CONFIG_CBS) += cbs.o cbs_bsf.o
OBJS-$(CONFIG_CBS_AV1) += cbs_av1.o
OBJS-$(CONFIG_CBS_H264) += cbs_h2645.o cbs_sei.o h2645_parse.o
OBJS-$(CONFIG_CBS_H265) += cbs_h2645.o cbs_sei.o h2645_parse.o

159
libavcodec/cbs_bsf.c Normal file
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@ -0,0 +1,159 @@
/*
* 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 "bsf_internal.h"
#include "cbs_bsf.h"
static int cbs_bsf_update_side_data(AVBSFContext *bsf, AVPacket *pkt)
{
CBSBSFContext *ctx = bsf->priv_data;
CodedBitstreamFragment *frag = &ctx->fragment;
uint8_t *side_data;
int side_data_size;
int err;
side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
&side_data_size);
if (!side_data_size)
return 0;
err = ff_cbs_read(ctx->input, frag, side_data, side_data_size);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR,
"Failed to read extradata from packet side data.\n");
return err;
}
err = ctx->type->update_fragment(bsf, NULL, frag);
if (err < 0)
return err;
err = ff_cbs_write_fragment_data(ctx->output, frag);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR,
"Failed to write extradata into packet side data.\n");
return err;
}
side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
frag->data_size);
if (!side_data)
return AVERROR(ENOMEM);
memcpy(side_data, frag->data, frag->data_size);
ff_cbs_fragment_reset(frag);
return 0;
}
int ff_cbs_bsf_generic_filter(AVBSFContext *bsf, AVPacket *pkt)
{
CBSBSFContext *ctx = bsf->priv_data;
CodedBitstreamFragment *frag = &ctx->fragment;
int err;
err = ff_bsf_get_packet_ref(bsf, pkt);
if (err < 0)
return err;
err = cbs_bsf_update_side_data(bsf, pkt);
if (err < 0)
goto fail;
err = ff_cbs_read_packet(ctx->input, frag, pkt);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read %s from packet.\n",
ctx->type->fragment_name);
goto fail;
}
if (frag->nb_units == 0) {
av_log(bsf, AV_LOG_ERROR, "No %s found in packet.\n",
ctx->type->unit_name);
err = AVERROR_INVALIDDATA;
goto fail;
}
err = ctx->type->update_fragment(bsf, pkt, frag);
if (err < 0)
goto fail;
err = ff_cbs_write_packet(ctx->output, pkt, frag);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write %s into packet.\n",
ctx->type->fragment_name);
goto fail;
}
err = 0;
fail:
ff_cbs_fragment_reset(frag);
if (err < 0)
av_packet_unref(pkt);
return err;
}
int ff_cbs_bsf_generic_init(AVBSFContext *bsf, const CBSBSFType *type)
{
CBSBSFContext *ctx = bsf->priv_data;
CodedBitstreamFragment *frag = &ctx->fragment;
int err;
ctx->type = type;
err = ff_cbs_init(&ctx->input, type->codec_id, bsf);
if (err < 0)
return err;
err = ff_cbs_init(&ctx->output, type->codec_id, bsf);
if (err < 0)
return err;
if (bsf->par_in->extradata) {
err = ff_cbs_read_extradata(ctx->input, frag, bsf->par_in);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
goto fail;
}
err = type->update_fragment(bsf, NULL, frag);
if (err < 0)
goto fail;
err = ff_cbs_write_extradata(ctx->output, bsf->par_out, frag);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
goto fail;
}
}
err = 0;
fail:
ff_cbs_fragment_reset(frag);
return err;
}
void ff_cbs_bsf_generic_close(AVBSFContext *bsf)
{
CBSBSFContext *ctx = bsf->priv_data;
ff_cbs_fragment_free(&ctx->fragment);
ff_cbs_close(&ctx->input);
ff_cbs_close(&ctx->output);
}

131
libavcodec/cbs_bsf.h Normal file
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@ -0,0 +1,131 @@
/*
* 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
*/
#ifndef AVCODEC_CBS_BSF_H
#define AVCODEC_CBS_BSF_H
#include "cbs.h"
typedef struct CBSBSFType {
enum AVCodecID codec_id;
// Name of a frame fragment in this codec (e.g. "access unit",
// "temporal unit").
const char *fragment_name;
// Name of a unit for this BSF, for use in error messages (e.g.
// "NAL unit", "OBU").
const char *unit_name;
// Update the content of a fragment with whatever metadata changes
// are desired. The associated AVPacket is provided so that any side
// data associated with the fragment can be inspected or edited. If
// pkt is NULL, then an extradata header fragment is being updated.
int (*update_fragment)(AVBSFContext *bsf, AVPacket *pkt,
CodedBitstreamFragment *frag);
} CBSBSFType;
// Common structure for all generic CBS BSF users. An instance of this
// structure must be the first member of the BSF private context (to be
// pointed to by AVBSFContext.priv_data).
typedef struct CBSBSFContext {
const AVClass *class;
const CBSBSFType *type;
CodedBitstreamContext *input;
CodedBitstreamContext *output;
CodedBitstreamFragment fragment;
} CBSBSFContext;
/**
* Initialise generic CBS BSF setup.
*
* Creates the input and output CBS instances, and applies the filter to
* the extradata on the input codecpar if any is present.
*
* Since it calls the update_fragment() function immediately to deal with
* extradata, this should be called after any codec-specific setup is done
* (probably at the end of the AVBitStreamFilter.init function).
*/
int ff_cbs_bsf_generic_init(AVBSFContext *bsf, const CBSBSFType *type);
/**
* Close a generic CBS BSF instance.
*
* If no other deinitialisation is required then this function can be used
* directly as AVBitStreamFilter.close.
*/
void ff_cbs_bsf_generic_close(AVBSFContext *bsf);
/**
* Filter operation for CBS BSF.
*
* Reads the input packet into a CBS fragment, calls update_fragment() on
* it, then writes the result to an output packet. If the input packet
* has AV_PKT_DATA_NEW_EXTRADATA side-data associated with it then it does
* the same thing to that new extradata to form the output side-data first.
*
* If the BSF does not do anything else then this function can be used
* directly as AVBitStreamFilter.filter.
*/
int ff_cbs_bsf_generic_filter(AVBSFContext *bsf, AVPacket *pkt);
// Options for element manipulation.
enum {
// Pass this element through unchanged.
BSF_ELEMENT_PASS,
// Insert this element, replacing any existing instances of it.
// Associated values may be provided explicitly (as addtional options)
// or implicitly (either as side data or deduced from other parts of
// the stream).
BSF_ELEMENT_INSERT,
// Remove this element if it appears in the stream.
BSF_ELEMENT_REMOVE,
// Extract this element to side data, so that further manipulation
// can happen elsewhere.
BSF_ELEMENT_EXTRACT,
};
#define BSF_ELEMENT_OPTIONS_PIR(name, help, field, opt_flags) \
{ name, help, OFFSET(field), AV_OPT_TYPE_INT, \
{ .i64 = BSF_ELEMENT_PASS }, \
BSF_ELEMENT_PASS, BSF_ELEMENT_REMOVE, opt_flags, name }, \
{ "pass", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_PASS }, .flags = opt_flags, .unit = name }, \
{ "insert", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_INSERT }, .flags = opt_flags, .unit = name }, \
{ "remove", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_REMOVE }, .flags = opt_flags, .unit = name }
#define BSF_ELEMENT_OPTIONS_PIRE(name, help, field, opt_flags) \
{ name, help, OFFSET(field), AV_OPT_TYPE_INT, \
{ .i64 = BSF_ELEMENT_PASS }, \
BSF_ELEMENT_PASS, BSF_ELEMENT_EXTRACT, opt_flags, name }, \
{ "pass", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_PASS }, .flags = opt_flags, .unit = name }, \
{ "insert", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_INSERT }, .flags = opt_flags, .unit = name }, \
{ "remove", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_REMOVE }, .flags = opt_flags, .unit = name }, \
{ "extract", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_EXTRACT }, .flags = opt_flags, .unit = name } \
#endif /* AVCODEC_CBS_BSF_H */