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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 "avcodec.h"
#include "bsf.h"
#include "cbs.h"
#include "cbs_av1.h"
typedef struct AV1FMergeContext {
CodedBitstreamContext *cbc;
CodedBitstreamFragment frag[2];
AVPacket *pkt, *in;
int idx;
} AV1FMergeContext;
static void av1_frame_merge_flush(AVBSFContext *bsf)
{
AV1FMergeContext *ctx = bsf->priv_data;
ff_cbs_fragment_reset(ctx->cbc, &ctx->frag[0]);
ff_cbs_fragment_reset(ctx->cbc, &ctx->frag[1]);
av_packet_unref(ctx->in);
av_packet_unref(ctx->pkt);
}
static int av1_frame_merge_filter(AVBSFContext *bsf, AVPacket *out)
{
AV1FMergeContext *ctx = bsf->priv_data;
CodedBitstreamFragment *frag = &ctx->frag[ctx->idx], *tu = &ctx->frag[!ctx->idx];
AVPacket *in = ctx->in, *buffer_pkt = ctx->pkt;
int err, i;
err = ff_bsf_get_packet_ref(bsf, in);
if (err < 0) {
if (err == AVERROR_EOF && tu->nb_units > 0)
goto eof;
return err;
}
err = ff_cbs_read_packet(ctx->cbc, frag, in);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
goto fail;
}
if (frag->nb_units == 0) {
av_log(bsf, AV_LOG_ERROR, "No OBU in packet.\n");
err = AVERROR_INVALIDDATA;
goto fail;
}
if (tu->nb_units == 0 && frag->units[0].type != AV1_OBU_TEMPORAL_DELIMITER) {
av_log(bsf, AV_LOG_ERROR, "Missing Temporal Delimiter.\n");
err = AVERROR_INVALIDDATA;
goto fail;
}
for (i = 1; i < frag->nb_units; i++) {
if (frag->units[i].type == AV1_OBU_TEMPORAL_DELIMITER) {
av_log(bsf, AV_LOG_ERROR, "Temporal Delimiter in the middle of a packet.\n");
err = AVERROR_INVALIDDATA;
goto fail;
}
}
if (tu->nb_units > 0 && frag->units[0].type == AV1_OBU_TEMPORAL_DELIMITER) {
eof:
err = ff_cbs_write_packet(ctx->cbc, buffer_pkt, tu);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
goto fail;
}
av_packet_move_ref(out, buffer_pkt);
// Swap fragment index, to avoid copying fragment references.
ctx->idx = !ctx->idx;
} else {
for (i = 0; i < frag->nb_units; i++) {
err = ff_cbs_insert_unit_content(ctx->cbc, tu, -1, frag->units[i].type,
frag->units[i].content, frag->units[i].content_ref);
if (err < 0)
goto fail;
}
err = AVERROR(EAGAIN);
}
// Buffer packets with timestamps. There should be at most one per TU, be it split or not.
if (!buffer_pkt->data && in->pts != AV_NOPTS_VALUE)
av_packet_move_ref(buffer_pkt, in);
else
av_packet_unref(in);
ff_cbs_fragment_reset(ctx->cbc, &ctx->frag[ctx->idx]);
fail:
if (err < 0 && err != AVERROR(EAGAIN))
av1_frame_merge_flush(bsf);
return err;
}
static int av1_frame_merge_init(AVBSFContext *bsf)
{
AV1FMergeContext *ctx = bsf->priv_data;
ctx->in = av_packet_alloc();
ctx->pkt = av_packet_alloc();
if (!ctx->in || !ctx->pkt)
return AVERROR(ENOMEM);
return ff_cbs_init(&ctx->cbc, AV_CODEC_ID_AV1, bsf);
}
static void av1_frame_merge_close(AVBSFContext *bsf)
{
AV1FMergeContext *ctx = bsf->priv_data;
ff_cbs_fragment_free(ctx->cbc, &ctx->frag[0]);
ff_cbs_fragment_free(ctx->cbc, &ctx->frag[1]);
av_packet_free(&ctx->in);
av_packet_free(&ctx->pkt);
ff_cbs_close(&ctx->cbc);
}
static const enum AVCodecID av1_frame_merge_codec_ids[] = {
AV_CODEC_ID_AV1, AV_CODEC_ID_NONE,
};
const AVBitStreamFilter ff_av1_frame_merge_bsf = {
.name = "av1_frame_merge",
.priv_data_size = sizeof(AV1FMergeContext),
.init = av1_frame_merge_init,
.flush = av1_frame_merge_flush,
.close = av1_frame_merge_close,
.filter = av1_frame_merge_filter,
.codec_ids = av1_frame_merge_codec_ids,
};
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