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ffmpeg/libavcodec/libxevd.c

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/*
* libxevd decoder
* EVC (MPEG-5 Essential Video Coding) decoding using XEVD MPEG-5 EVC decoder library
*
* Copyright (C) 2021 Dawid Kozinski <d.kozinski@samsung.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 <stddef.h>
#include <xevd.h>
#include "libavutil/internal.h"
#include "libavutil/common.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/imgutils.h"
#include "libavutil/cpu.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "profiles.h"
#include "decode.h"
#define XEVD_PARAM_BAD_NAME -1
#define XEVD_PARAM_BAD_VALUE -2
#define EVC_NAL_HEADER_SIZE 2 /* byte */
/**
* The structure stores all the states associated with the instance of Xeve MPEG-5 EVC decoder
*/
typedef struct XevdContext {
XEVD id; // XEVD instance identifier @see xevd.h
XEVD_CDSC cdsc; // decoding parameters @see xevd.h
// If end of stream occurs it is required "flushing" (aka draining) the codec,
// as the codec might buffer multiple frames or packets internally.
int draining_mode; // The flag is set if codec enters draining mode.
AVPacket *pkt; // access unit (a set of NAL units that are consecutive in decoding order and containing exactly one encoded image)
} XevdContext;
/**
* The function populates the XEVD_CDSC structure.
* XEVD_CDSC contains all decoder parameters that should be initialized before its use.
*
* @param[in] avctx codec context
* @param[out] cdsc contains all decoder parameters that should be initialized before its use
*
*/
static void get_conf(AVCodecContext *avctx, XEVD_CDSC *cdsc)
{
int cpu_count = av_cpu_count();
/* clear XEVS_CDSC structure */
memset(cdsc, 0, sizeof(XEVD_CDSC));
/* init XEVD_CDSC */
if (avctx->thread_count <= 0)
cdsc->threads = (cpu_count < XEVD_MAX_TASK_CNT) ? cpu_count : XEVD_MAX_TASK_CNT;
else if (avctx->thread_count > XEVD_MAX_TASK_CNT)
cdsc->threads = XEVD_MAX_TASK_CNT;
else
cdsc->threads = avctx->thread_count;
}
/**
* Read NAL unit length
* @param bs input data (bitstream)
* @return the length of NAL unit on success, 0 value on failure
*/
static uint32_t read_nal_unit_length(const uint8_t *bs, int bs_size, AVCodecContext *avctx)
{
uint32_t len = 0;
XEVD_INFO info;
int ret;
if (bs_size == XEVD_NAL_UNIT_LENGTH_BYTE) {
ret = xevd_info((void *)bs, XEVD_NAL_UNIT_LENGTH_BYTE, 1, &info);
if (XEVD_FAILED(ret)) {
av_log(avctx, AV_LOG_ERROR, "Cannot get bitstream information\n");
return 0;
}
len = info.nalu_len;
if (len == 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid bitstream size! [%d]\n", bs_size);
return 0;
}
}
return len;
}
/**
* @param[in] xectx the structure that stores all the state associated with the instance of Xeve MPEG-5 EVC decoder
* @param[out] avctx codec context
* @return 0 on success, negative value on failure
*/
static int export_stream_params(const XevdContext *xectx, AVCodecContext *avctx)
{
int ret;
int size;
int color_space;
avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
size = 4;
ret = xevd_config(xectx->id, XEVD_CFG_GET_CODED_WIDTH, &avctx->coded_width, &size);
if (XEVD_FAILED(ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to get coded_width\n");
return AVERROR_EXTERNAL;
}
ret = xevd_config(xectx->id, XEVD_CFG_GET_CODED_HEIGHT, &avctx->coded_height, &size);
if (XEVD_FAILED(ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to get coded_height\n");
return AVERROR_EXTERNAL;
}
ret = xevd_config(xectx->id, XEVD_CFG_GET_WIDTH, &avctx->width, &size);
if (XEVD_FAILED(ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to get width\n");
return AVERROR_EXTERNAL;
}
ret = xevd_config(xectx->id, XEVD_CFG_GET_HEIGHT, &avctx->height, &size);
if (XEVD_FAILED(ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to get height\n");
return AVERROR_EXTERNAL;
}
ret = xevd_config(xectx->id, XEVD_CFG_GET_COLOR_SPACE, &color_space, &size);
if (XEVD_FAILED(ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to get color_space\n");
return AVERROR_EXTERNAL;
}
switch(color_space) {
case XEVD_CS_YCBCR400_10LE:
avctx->pix_fmt = AV_PIX_FMT_GRAY10LE;
break;
case XEVD_CS_YCBCR420_10LE:
avctx->pix_fmt = AV_PIX_FMT_YUV420P10LE;
break;
case XEVD_CS_YCBCR422_10LE:
avctx->pix_fmt = AV_PIX_FMT_YUV422P10LE;
break;
case XEVD_CS_YCBCR444_10LE:
avctx->pix_fmt = AV_PIX_FMT_YUV444P10LE;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown color space\n");
avctx->pix_fmt = AV_PIX_FMT_NONE;
return AVERROR_INVALIDDATA;
}
// the function returns sps->num_reorder_pics
ret = xevd_config(xectx->id, XEVD_CFG_GET_MAX_CODING_DELAY, &avctx->max_b_frames, &size);
if (XEVD_FAILED(ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to get max_coding_delay\n");
return AVERROR_EXTERNAL;
}
avctx->has_b_frames = (avctx->max_b_frames) ? 1 : 0;
return 0;
}
/**
* @brief Copy image in imgb to frame.
*
* @param avctx codec context
* @param[in] imgb
* @param[out] frame
* @return 0 on success, negative value on failure
*/
static int libxevd_image_copy(struct AVCodecContext *avctx, XEVD_IMGB *imgb, struct AVFrame *frame)
{
int ret;
if (imgb->cs != XEVD_CS_YCBCR420_10LE) {
av_log(avctx, AV_LOG_ERROR, "Not supported pixel format: %s\n", av_get_pix_fmt_name(avctx->pix_fmt));
return AVERROR_INVALIDDATA;
}
if (imgb->w[0] != avctx->width || imgb->h[0] != avctx->height) { // stream resolution changed
if (ff_set_dimensions(avctx, imgb->w[0], imgb->h[0]) < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot set new dimension\n");
return AVERROR_INVALIDDATA;
}
}
if (ret = ff_get_buffer(avctx, frame, 0) < 0)
return ret;
av_image_copy(frame->data, frame->linesize, (const uint8_t **)imgb->a,
imgb->s, avctx->pix_fmt,
imgb->w[0], imgb->h[0]);
return 0;
}
/**
* Initialize decoder
* Create a decoder instance and allocate all the needed resources
*
* @param avctx codec context
* @return 0 on success, negative error code on failure
*/
static av_cold int libxevd_init(AVCodecContext *avctx)
{
XevdContext *xectx = avctx->priv_data;
XEVD_CDSC *cdsc = &(xectx->cdsc);
/* read configurations and set values for created descriptor (XEVD_CDSC) */
get_conf(avctx, cdsc);
/* create decoder */
xectx->id = xevd_create(&(xectx->cdsc), NULL);
if (xectx->id == NULL) {
av_log(avctx, AV_LOG_ERROR, "Cannot create XEVD encoder\n");
return AVERROR_EXTERNAL;
}
xectx->draining_mode = 0;
xectx->pkt = av_packet_alloc();
if (!xectx->pkt) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate memory for AVPacket\n");
return AVERROR(ENOMEM);
}
return 0;
}
static int libxevd_return_frame(AVCodecContext *avctx, AVFrame *frame,
XEVD_IMGB *imgb, AVPacket **pkt_au)
{
AVPacket *pkt_au_imgb = (AVPacket*)imgb->pdata[0];
int ret;
if (!pkt_au_imgb) {
av_log(avctx, AV_LOG_ERROR, "Invalid data needed to fill frame properties\n");
if (pkt_au)
av_packet_free(pkt_au);
av_frame_unref(frame);
imgb->release(imgb);
imgb = NULL;
return AVERROR_INVALIDDATA;
}
// got frame
ret = libxevd_image_copy(avctx, imgb, frame);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Image copying error\n");
av_packet_free(&pkt_au_imgb);
av_frame_unref(frame);
imgb->release(imgb);
imgb = NULL;
return ret;
}
// use ff_decode_frame_props_from_pkt() to fill frame properties
ret = ff_decode_frame_props_from_pkt(avctx, frame, pkt_au_imgb);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "ff_decode_frame_props_from_pkt error\n");
av_packet_free(&pkt_au_imgb);
av_frame_unref(frame);
imgb->release(imgb);
imgb = NULL;
return ret;
}
frame->pkt_dts = imgb->ts[XEVD_TS_DTS];
frame->pts = imgb->ts[XEVD_TS_PTS];
av_packet_free(&pkt_au_imgb);
// xevd_pull uses pool of objects of type XEVD_IMGB.
// The pool size is equal MAX_PB_SIZE (26), so release object when it is no more needed
imgb->release(imgb);
imgb = NULL;
return 0;
}
/**
* Decode frame with decoupled packet/frame dataflow
*
* @param avctx codec context
* @param[out] frame decoded frame
*
* @return 0 on success, negative error code on failure
*/
static int libxevd_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
XevdContext *xectx = avctx->priv_data;
AVPacket *pkt = xectx->pkt;
XEVD_IMGB *imgb = NULL;
int xevd_ret = 0;
int ret = 0;
// obtain access unit (input data) - a set of NAL units that are consecutive in decoding order and containing exactly one encoded image
ret = ff_decode_get_packet(avctx, pkt);
if (ret < 0 && ret != AVERROR_EOF) {
av_packet_unref(pkt);
return ret;
} else if(ret == AVERROR_EOF && xectx->draining_mode == 0) { // End of stream situations. Enter draining mode
xectx->draining_mode = 1;
av_packet_unref(pkt);
}
if (pkt->size > 0) {
int bs_read_pos = 0;
XEVD_STAT stat;
XEVD_BITB bitb;
int nalu_size;
AVPacket *pkt_au = av_packet_alloc();
imgb = NULL;
if (!pkt_au) {
av_packet_unref(pkt);
return AVERROR(ENOMEM);
}
FFSWAP(AVPacket*, pkt_au, xectx->pkt);
// get all nal units from AU
while(pkt_au->size > (bs_read_pos + XEVD_NAL_UNIT_LENGTH_BYTE)) {
memset(&stat, 0, sizeof(XEVD_STAT));
nalu_size = read_nal_unit_length(pkt_au->data + bs_read_pos, XEVD_NAL_UNIT_LENGTH_BYTE, avctx);
if (nalu_size == 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid bitstream\n");
av_packet_free(&pkt_au);
ret = AVERROR_INVALIDDATA;
return ret;
}
bs_read_pos += XEVD_NAL_UNIT_LENGTH_BYTE;
bitb.addr = pkt_au->data + bs_read_pos;
bitb.ssize = nalu_size;
bitb.pdata[0] = pkt_au;
bitb.ts[XEVD_TS_DTS] = pkt_au->dts;
/* main decoding block */
xevd_ret = xevd_decode(xectx->id, &bitb, &stat);
if (XEVD_FAILED(xevd_ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to decode bitstream\n");
av_packet_free(&pkt_au);
return AVERROR_EXTERNAL;
}
bs_read_pos += nalu_size;
if (stat.nalu_type == XEVD_NUT_SPS) { // EVC stream parameters changed
if ((ret = export_stream_params(xectx, avctx)) != 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to export stream params\n");
av_packet_free(&pkt_au);
return ret;
}
}
if (stat.read != nalu_size)
av_log(avctx, AV_LOG_INFO, "Different reading of bitstream (in:%d, read:%d)\n,", nalu_size, stat.read);
// stat.fnum - has negative value if the decoded data is not frame
if (stat.fnum >= 0) {
xevd_ret = xevd_pull(xectx->id, &imgb); // The function returns a valid image only if the return code is XEVD_OK
if (XEVD_FAILED(xevd_ret)) {
av_log(avctx, AV_LOG_ERROR, "Failed to pull the decoded image (xevd error code: %d, frame#=%d)\n", xevd_ret, stat.fnum);
av_packet_free(&pkt_au);
return AVERROR_EXTERNAL;
} else if (xevd_ret == XEVD_OK_FRM_DELAYED) {
if(bs_read_pos == pkt_au->size) {
return AVERROR(EAGAIN);
}
} else { // XEVD_OK
if (!imgb) {
if(bs_read_pos == pkt_au->size) {
av_log(avctx, AV_LOG_ERROR, "Invalid decoded image data\n");
av_packet_free(&pkt_au);
return AVERROR(EAGAIN);
}
} else {
return libxevd_return_frame(avctx, frame, imgb, &pkt_au);
}
}
}
}
} else { // decoder draining mode handling
xevd_ret = xevd_pull(xectx->id, &imgb);
if (xevd_ret == XEVD_ERR_UNEXPECTED) { // draining process completed
av_log(avctx, AV_LOG_DEBUG, "Draining process completed\n");
return AVERROR_EOF;
} else if (XEVD_FAILED(xevd_ret)) { // handle all other errors
av_log(avctx, AV_LOG_ERROR, "Failed to pull the decoded image (xevd error code: %d)\n", xevd_ret);
return AVERROR_EXTERNAL;
} else { // XEVD_OK
if (!imgb) {
av_log(avctx, AV_LOG_ERROR, "Invalid decoded image data\n");
return AVERROR_EXTERNAL;
}
return libxevd_return_frame(avctx, frame, imgb, NULL);
}
}
return ret;
}
/**
* Destroy decoder
*
* @param avctx codec context
* @return 0 on success
*/
static av_cold int libxevd_close(AVCodecContext *avctx)
{
XevdContext *xectx = avctx->priv_data;
if (xectx->id) {
xevd_delete(xectx->id);
xectx->id = NULL;
}
xectx->draining_mode = 0;
av_packet_free(&xectx->pkt);
return 0;
}
const FFCodec ff_libxevd_decoder = {
.p.name = "evc",
CODEC_LONG_NAME("EVC / MPEG-5 Essential Video Coding (EVC)"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_EVC,
.init = libxevd_init,
FF_CODEC_RECEIVE_FRAME_CB(libxevd_receive_frame),
.close = libxevd_close,
.priv_data_size = sizeof(XevdContext),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_OTHER_THREADS | AV_CODEC_CAP_AVOID_PROBING,
.p.profiles = NULL_IF_CONFIG_SMALL(ff_evc_profiles),
.p.wrapper_name = "libxevd",
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_NOT_INIT_THREADSAFE |
FF_CODEC_CAP_SETS_FRAME_PROPS,
};
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