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/*
* Copyright (c) 2019 James Almer <jamrial@gmail.com>
*
* 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 "get_bits.h"
#include "golomb.h"
#include "bsf.h"
#include "bsf_internal.h"
#include "avcodec.h"
#include "evc.h"
#include "evc_parse.h"
#define INIT_AU_BUF_CAPACITY 1024
// Access unit data
typedef struct AccessUnitBuffer {
uint8_t *data; // the data buffer
size_t data_size; // size of data in bytes
size_t capacity; // buffer capacity
} AccessUnitBuffer;
typedef struct EVCFMergeContext {
AVPacket *in;
EVCParserContext parser_ctx;
AccessUnitBuffer au_buffer;
} EVCFMergeContext;
static int end_of_access_unit_found(EVCParserContext *parser_ctx)
{
if (parser_ctx->profile == 0) { // BASELINE profile
if (parser_ctx->nalu_type == EVC_NOIDR_NUT || parser_ctx->nalu_type == EVC_IDR_NUT)
return 1;
} else { // MAIN profile
if (parser_ctx->nalu_type == EVC_NOIDR_NUT) {
if (parser_ctx->poc.PicOrderCntVal != parser_ctx->poc.prevPicOrderCntVal)
return 1;
} else if (parser_ctx->nalu_type == EVC_IDR_NUT)
return 1;
}
return 0;
}
static void evc_frame_merge_flush(AVBSFContext *bsf)
{
EVCFMergeContext *ctx = bsf->priv_data;
av_packet_unref(ctx->in);
}
static int evc_frame_merge_filter(AVBSFContext *bsf, AVPacket *out)
{
EVCFMergeContext *ctx = bsf->priv_data;
EVCParserContext *parser_ctx = &ctx->parser_ctx;
AVPacket *in = ctx->in;
int free_space = 0;
size_t nalu_size = 0;
uint8_t *nalu = NULL;
int au_end_found = 0;
int err;
err = ff_bsf_get_packet_ref(bsf, in);
if (err < 0)
return err;
nalu_size = evc_read_nal_unit_length(in->data, EVC_NALU_LENGTH_PREFIX_SIZE, bsf);
if (nalu_size <= 0) {
av_packet_unref(in);
return AVERROR_INVALIDDATA;
}
nalu = in->data + EVC_NALU_LENGTH_PREFIX_SIZE;
nalu_size = in->size - EVC_NALU_LENGTH_PREFIX_SIZE;
// NAL unit parsing needed to determine if end of AU was found
err = ff_evc_parse_nal_unit(parser_ctx, nalu, nalu_size, bsf);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "NAL Unit parsing error\n");
av_packet_unref(in);
return err;
}
au_end_found = end_of_access_unit_found(parser_ctx);
free_space = ctx->au_buffer.capacity - ctx->au_buffer.data_size;
while (free_space < in->size) {
ctx->au_buffer.capacity *= 2;
free_space = ctx->au_buffer.capacity - ctx->au_buffer.data_size;
if (free_space >= in->size)
ctx->au_buffer.data = av_realloc(ctx->au_buffer.data, ctx->au_buffer.capacity);
}
memcpy(ctx->au_buffer.data + ctx->au_buffer.data_size, in->data, in->size);
ctx->au_buffer.data_size += in->size;
av_packet_unref(in);
if (au_end_found) {
uint8_t *data = av_memdup(ctx->au_buffer.data, ctx->au_buffer.data_size);
err = av_packet_from_data(out, data, ctx->au_buffer.data_size);
ctx->au_buffer.data_size = 0;
} else
err = AVERROR(EAGAIN);
if (err < 0 && err != AVERROR(EAGAIN))
evc_frame_merge_flush(bsf);
return err;
}
static int evc_frame_merge_init(AVBSFContext *bsf)
{
EVCFMergeContext *ctx = bsf->priv_data;
ctx->in = av_packet_alloc();
if (!ctx->in)
return AVERROR(ENOMEM);
ctx->au_buffer.capacity = INIT_AU_BUF_CAPACITY;
ctx->au_buffer.data = av_malloc(INIT_AU_BUF_CAPACITY);
ctx->au_buffer.data_size = 0;
return 0;
}
static void evc_frame_merge_close(AVBSFContext *bsf)
{
EVCFMergeContext *ctx = bsf->priv_data;
av_packet_free(&ctx->in);
ctx->au_buffer.capacity = 0;
av_freep(&ctx->au_buffer.data);
ctx->au_buffer.data_size = 0;
}
static const enum AVCodecID evc_frame_merge_codec_ids[] = {
AV_CODEC_ID_EVC, AV_CODEC_ID_NONE,
};
const FFBitStreamFilter ff_evc_frame_merge_bsf = {
.p.name = "evc_frame_merge",
.p.codec_ids = evc_frame_merge_codec_ids,
.priv_data_size = sizeof(EVCFMergeContext),
.init = evc_frame_merge_init,
.flush = evc_frame_merge_flush,
.close = evc_frame_merge_close,
.filter = evc_frame_merge_filter,
};
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