virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-28 20:53:54 +02:00
Code Issues Releases Activity
9902fc550a
FFmpeg/libavcodec/hevc_parser.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

360 lines
12 KiB
C
Raw Blame History

/*
* HEVC Annex B format parser
*
* Copyright (C) 2012 - 2013 Guillaume Martres
*
* 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 "libavutil/common.h"
#include "libavutil/mem.h"
#include "golomb.h"
#include "hevc.h"
#include "hevc_parse.h"
#include "hevc_ps.h"
#include "hevc_sei.h"
#include "h2645_parse.h"
#include "parser.h"
#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes
#define IS_IRAP_NAL(nal) (nal->type >= 16 && nal->type <= 23)
#define IS_IDR_NAL(nal) (nal->type == HEVC_NAL_IDR_W_RADL || nal->type == HEVC_NAL_IDR_N_LP)
typedef struct HEVCParserContext {
ParseContext pc;
H2645Packet pkt;
HEVCParamSets ps;
HEVCSEI sei;
int is_avc;
int nal_length_size;
int parsed_extradata;
int poc;
int pocTid0;
} HEVCParserContext;
static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
AVCodecContext *avctx)
{
HEVCParserContext *ctx = s->priv_data;
HEVCParamSets *ps = &ctx->ps;
HEVCSEI *sei = &ctx->sei;
GetBitContext *gb = &nal->gb;
const HEVCWindow *ow;
int i, num = 0, den = 0;
unsigned int pps_id, first_slice_in_pic_flag, dependent_slice_segment_flag;
enum HEVCSliceType slice_type;
first_slice_in_pic_flag = get_bits1(gb);
s->picture_structure = sei->picture_timing.picture_struct;
s->field_order = sei->picture_timing.picture_struct;
if (IS_IRAP_NAL(nal)) {
s->key_frame = 1;
skip_bits1(gb); // no_output_of_prior_pics_flag
}
pps_id = get_ue_golomb(gb);
if (pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[pps_id]) {
av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", pps_id);
return AVERROR_INVALIDDATA;
}
ps->pps = ps->pps_list[pps_id];
if (ps->pps->sps_id >= HEVC_MAX_SPS_COUNT || !ps->sps_list[ps->pps->sps_id]) {
av_log(avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", ps->pps->sps_id);
return AVERROR_INVALIDDATA;
}
if (ps->sps != ps->sps_list[ps->pps->sps_id]) {
ps->sps = ps->sps_list[ps->pps->sps_id];
ps->vps = ps->vps_list[ps->sps->vps_id];
}
ow = &ps->sps->output_window;
s->coded_width = ps->sps->width;
s->coded_height = ps->sps->height;
s->width = ps->sps->width - ow->left_offset - ow->right_offset;
s->height = ps->sps->height - ow->top_offset - ow->bottom_offset;
s->format = ps->sps->pix_fmt;
avctx->profile = ps->sps->ptl.general_ptl.profile_idc;
avctx->level = ps->sps->ptl.general_ptl.level_idc;
if (ps->vps->vps_timing_info_present_flag) {
num = ps->vps->vps_num_units_in_tick;
den = ps->vps->vps_time_scale;
} else if (ps->sps->vui.vui_timing_info_present_flag) {
num = ps->sps->vui.vui_num_units_in_tick;
den = ps->sps->vui.vui_time_scale;
}
if (num != 0 && den != 0)
av_reduce(&avctx->framerate.den, &avctx->framerate.num,
num, den, 1 << 30);
if (!first_slice_in_pic_flag) {
unsigned int slice_segment_addr;
int slice_address_length;
if (ps->pps->dependent_slice_segments_enabled_flag)
dependent_slice_segment_flag = get_bits1(gb);
else
dependent_slice_segment_flag = 0;
slice_address_length = av_ceil_log2_c(ps->sps->ctb_width *
ps->sps->ctb_height);
slice_segment_addr = get_bitsz(gb, slice_address_length);
if (slice_segment_addr >= ps->sps->ctb_width * ps->sps->ctb_height) {
av_log(avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
slice_segment_addr);
return AVERROR_INVALIDDATA;
}
} else
dependent_slice_segment_flag = 0;
if (dependent_slice_segment_flag)
return 0; /* break; */
for (i = 0; i < ps->pps->num_extra_slice_header_bits; i++)
skip_bits(gb, 1); // slice_reserved_undetermined_flag[]
slice_type = get_ue_golomb_31(gb);
if (!(slice_type == HEVC_SLICE_I || slice_type == HEVC_SLICE_P ||
slice_type == HEVC_SLICE_B)) {
av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
slice_type);
return AVERROR_INVALIDDATA;
}
s->pict_type = slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
AV_PICTURE_TYPE_I;
if (ps->pps->output_flag_present_flag)
skip_bits1(gb); // pic_output_flag
if (ps->sps->separate_colour_plane_flag)
skip_bits(gb, 2); // colour_plane_id
if (!IS_IDR_NAL(nal)) {
int pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
s->output_picture_number = ctx->poc =
ff_hevc_compute_poc(ps->sps, ctx->pocTid0, pic_order_cnt_lsb, nal->type);
} else
s->output_picture_number = ctx->poc = 0;
if (nal->temporal_id == 0 &&
nal->type != HEVC_NAL_TRAIL_N &&
nal->type != HEVC_NAL_TSA_N &&
nal->type != HEVC_NAL_STSA_N &&
nal->type != HEVC_NAL_RADL_N &&
nal->type != HEVC_NAL_RASL_N &&
nal->type != HEVC_NAL_RADL_R &&
nal->type != HEVC_NAL_RASL_R)
ctx->pocTid0 = ctx->poc;
return 1; /* no need to evaluate the rest */
}
/**
* Parse NAL units of found picture and decode some basic information.
*
* @param s parser context.
* @param avctx codec context.
* @param buf buffer with field/frame data.
* @param buf_size size of the buffer.
*/
static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
int buf_size, AVCodecContext *avctx)
{
HEVCParserContext *ctx = s->priv_data;
HEVCParamSets *ps = &ctx->ps;
HEVCSEI *sei = &ctx->sei;
int ret, i;
/* set some sane default values */
s->pict_type = AV_PICTURE_TYPE_I;
s->key_frame = 0;
s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
ff_hevc_reset_sei(sei);
ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, ctx->is_avc,
ctx->nal_length_size, AV_CODEC_ID_HEVC, 1, 0);
if (ret < 0)
return ret;
for (i = 0; i < ctx->pkt.nb_nals; i++) {
H2645NAL *nal = &ctx->pkt.nals[i];
GetBitContext *gb = &nal->gb;
if (nal->nuh_layer_id > 0)
continue;
switch (nal->type) {
case HEVC_NAL_VPS:
ff_hevc_decode_nal_vps(gb, avctx, ps);
break;
case HEVC_NAL_SPS:
ff_hevc_decode_nal_sps(gb, avctx, ps, 1);
break;
case HEVC_NAL_PPS:
ff_hevc_decode_nal_pps(gb, avctx, ps);
break;
case HEVC_NAL_SEI_PREFIX:
case HEVC_NAL_SEI_SUFFIX:
ff_hevc_decode_nal_sei(gb, avctx, sei, ps, nal->type);
break;
case HEVC_NAL_TRAIL_N:
case HEVC_NAL_TRAIL_R:
case HEVC_NAL_TSA_N:
case HEVC_NAL_TSA_R:
case HEVC_NAL_STSA_N:
case HEVC_NAL_STSA_R:
case HEVC_NAL_BLA_W_LP:
case HEVC_NAL_BLA_W_RADL:
case HEVC_NAL_BLA_N_LP:
case HEVC_NAL_IDR_W_RADL:
case HEVC_NAL_IDR_N_LP:
case HEVC_NAL_CRA_NUT:
case HEVC_NAL_RADL_N:
case HEVC_NAL_RADL_R:
case HEVC_NAL_RASL_N:
case HEVC_NAL_RASL_R:
if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING) {
s->repeat_pict = 1;
} else if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING) {
s->repeat_pict = 2;
}
ret = hevc_parse_slice_header(s, nal, avctx);
if (ret)
return ret;
break;
}
}
/* didn't find a picture! */
av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
return -1;
}
/**
* Find the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or END_NOT_FOUND
*/
static int hevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
int buf_size)
{
HEVCParserContext *ctx = s->priv_data;
ParseContext *pc = &ctx->pc;
int i;
for (i = 0; i < buf_size; i++) {
int nut;
pc->state64 = (pc->state64 << 8) | buf[i];
if (((pc->state64 >> 3 * 8) & 0xFFFFFF) != START_CODE)
continue;
nut = (pc->state64 >> 2 * 8 + 1) & 0x3F;
// Beginning of access unit
if ((nut >= HEVC_NAL_VPS && nut <= HEVC_NAL_EOB_NUT) || nut == HEVC_NAL_SEI_PREFIX ||
(nut >= 41 && nut <= 44) || (nut >= 48 && nut <= 55)) {
if (pc->frame_start_found) {
pc->frame_start_found = 0;
if (!((pc->state64 >> 6 * 8) & 0xFF))
return i - 6;
return i - 5;
}
} else if (nut <= HEVC_NAL_RASL_R ||
(nut >= HEVC_NAL_BLA_W_LP && nut <= HEVC_NAL_CRA_NUT)) {
int first_slice_segment_in_pic_flag = buf[i] >> 7;
if (first_slice_segment_in_pic_flag) {
if (!pc->frame_start_found) {
pc->frame_start_found = 1;
} else { // First slice of next frame found
pc->frame_start_found = 0;
if (!((pc->state64 >> 6 * 8) & 0xFF))
return i - 6;
return i - 5;
}
}
}
}
return END_NOT_FOUND;
}
static int hevc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
int next;
HEVCParserContext *ctx = s->priv_data;
ParseContext *pc = &ctx->pc;
int is_dummy_buf = !buf_size;
const uint8_t *dummy_buf = buf;
if (avctx->extradata && !ctx->parsed_extradata) {
ff_hevc_decode_extradata(avctx->extradata, avctx->extradata_size, &ctx->ps, &ctx->sei,
&ctx->is_avc, &ctx->nal_length_size, avctx->err_recognition,
1, avctx);
ctx->parsed_extradata = 1;
}
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
} else {
next = hevc_find_frame_end(s, buf, buf_size);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
is_dummy_buf &= (dummy_buf == buf);
if (!is_dummy_buf)
parse_nal_units(s, buf, buf_size, avctx);
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
static void hevc_parser_close(AVCodecParserContext *s)
{
HEVCParserContext *ctx = s->priv_data;
ff_hevc_ps_uninit(&ctx->ps);
ff_h2645_packet_uninit(&ctx->pkt);
ff_hevc_reset_sei(&ctx->sei);
av_freep(&ctx->pc.buffer);
}
const AVCodecParser ff_hevc_parser = {
.codec_ids = { AV_CODEC_ID_HEVC },
.priv_data_size = sizeof(HEVCParserContext),
.parser_parse = hevc_parse,
.parser_close = hevc_parser_close,
};
Reference in New Issue View Git Blame Copy Permalink