/*
* AVS2 decoding using the davs2 library
*
* Copyright (C) 2018 Yiqun Xu, <yiqun.xu@vipl.ict.ac.cn>
* Falei Luo, <falei.luo@gmail.com>
* Huiwen Ren, <hwrenx@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 "davs2.h"
typedef struct DAVS2Context {
void *decoder;
AVFrame *frame;
davs2_param_t param; // decoding parameters
davs2_packet_t packet; // input bitstream
davs2_picture_t out_frame; // output data, frame data
davs2_seq_info_t headerset; // output data, sequence header
}DAVS2Context;
static av_cold int davs2_init(AVCodecContext *avctx)
{
DAVS2Context *cad = avctx->priv_data;
int cpu_flags = av_get_cpu_flags();
/* init the decoder */
cad->param.threads = avctx->thread_count;
cad->param.info_level = 0;
cad->param.disable_avx = !(cpu_flags & AV_CPU_FLAG_AVX &&
cpu_flags & AV_CPU_FLAG_AVX2);
cad->decoder = davs2_decoder_open(&cad->param);
if (!cad->decoder) {
av_log(avctx, AV_LOG_ERROR, "decoder created error.");
return AVERROR_EXTERNAL;
}
av_log(avctx, AV_LOG_VERBOSE, "decoder created. %p\n", cad->decoder);
return 0;
}
static int davs2_dump_frames(AVCodecContext *avctx, davs2_picture_t *pic, int *got_frame,
davs2_seq_info_t *headerset, int ret_type, AVFrame *frame)
{
DAVS2Context *cad = avctx->priv_data;
int bytes_per_sample = pic->bytes_per_sample;
int plane = 0;
int line = 0;
if (!headerset) {
*got_frame = 0;
return 0;
}
if (!pic || ret_type == DAVS2_GOT_HEADER) {
avctx->width = headerset->width;
avctx->height = headerset->height;
avctx->pix_fmt = headerset->output_bit_depth == 10 ?
AV_PIX_FMT_YUV420P10 : AV_PIX_FMT_YUV420P;
avctx->framerate = av_d2q(headerset->frame_rate,4096);
*got_frame = 0;
return 0;
}
switch (pic->type) {
case DAVS2_PIC_I:
case DAVS2_PIC_G:
frame->pict_type = AV_PICTURE_TYPE_I;
break;
case DAVS2_PIC_P:
case DAVS2_PIC_S:
frame->pict_type = AV_PICTURE_TYPE_P;
break;
case DAVS2_PIC_B:
frame->pict_type = AV_PICTURE_TYPE_B;
break;
case DAVS2_PIC_F:
frame->pict_type = AV_PICTURE_TYPE_S;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Decoder error: unknown frame type\n");
return AVERROR_EXTERNAL;
}
for (plane = 0; plane < 3; ++plane) {
int size_line = pic->widths[plane] * bytes_per_sample;
frame->buf[plane] = av_buffer_alloc(size_line * pic->lines[plane]);
if (!frame->buf[plane]){
av_log(avctx, AV_LOG_ERROR, "Decoder error: allocation failure, can't dump frames.\n");
return AVERROR(ENOMEM);
}
frame->data[plane] = frame->buf[plane]->data;
frame->linesize[plane] = size_line;
for (line = 0; line < pic->lines[plane]; ++line)
memcpy(frame->data[plane] + line * size_line,
pic->planes[plane] + line * pic->strides[plane],
pic->widths[plane] * bytes_per_sample);
}
frame->width = cad->headerset.width;
frame->height = cad->headerset.height;
frame->pts = cad->out_frame.pts;
frame->format = avctx->pix_fmt;
*got_frame = 1;
return 0;
}
static void davs2_flush(AVCodecContext *avctx)
{
DAVS2Context *cad = avctx->priv_data;
int ret = DAVS2_GOT_FRAME;
while (ret == DAVS2_GOT_FRAME) {
ret = davs2_decoder_flush(cad->decoder, &cad->headerset, &cad->out_frame);
davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
}
if (ret == DAVS2_ERROR) {
av_log(avctx, AV_LOG_WARNING, "Decoder flushing failed.\n");
}
}
static int send_delayed_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
{
DAVS2Context *cad = avctx->priv_data;
int ret = DAVS2_DEFAULT;
ret = davs2_decoder_flush(cad->decoder, &cad->headerset, &cad->out_frame);
if (ret == DAVS2_ERROR) {
av_log(avctx, AV_LOG_ERROR, "Decoder error: can't flush delayed frame\n");
return AVERROR_EXTERNAL;
}
if (ret == DAVS2_GOT_FRAME) {
ret = davs2_dump_frames(avctx, &cad->out_frame, got_frame, &cad->headerset, ret, frame);
davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
}
return ret;
}
static av_cold int davs2_end(AVCodecContext *avctx)
{
DAVS2Context *cad = avctx->priv_data;
/* close the decoder */
if (cad->decoder) {
davs2_decoder_close(cad->decoder);
cad->decoder = NULL;
}
return 0;
}
static int davs2_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
DAVS2Context *cad = avctx->priv_data;
int buf_size = avpkt->size;
uint8_t *buf_ptr = avpkt->data;
AVFrame *frame = data;
int ret = DAVS2_DEFAULT;
/* end of stream, output what is still in the buffers */
if (!buf_size) {
return send_delayed_frame(avctx, frame, got_frame);
}
cad->packet.data = buf_ptr;
cad->packet.len = buf_size;
cad->packet.pts = avpkt->pts;
cad->packet.dts = avpkt->dts;
ret = davs2_decoder_send_packet(cad->decoder, &cad->packet);
if (ret == DAVS2_ERROR) {
av_log(avctx, AV_LOG_ERROR, "Decoder error: can't read packet\n");
return AVERROR_EXTERNAL;
}
ret = davs2_decoder_recv_frame(cad->decoder, &cad->headerset, &cad->out_frame);
if (ret != DAVS2_DEFAULT) {
ret = davs2_dump_frames(avctx, &cad->out_frame, got_frame, &cad->headerset, ret, frame);
davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
}
return ret == 0 ? buf_size : ret;
}
AVCodec ff_libdavs2_decoder = {
.name = "libdavs2",
.long_name = NULL_IF_CONFIG_SMALL("libdavs2 AVS2-P2/IEEE1857.4"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_AVS2,
.priv_data_size = sizeof(DAVS2Context),
.init = davs2_init,
.close = davs2_end,
.decode = davs2_decode_frame,
.flush = davs2_flush,
.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE },
.wrapper_name = "libdavs2",
};