mirror of https://git.ffmpeg.org/ffmpeg.git
612 lines
21 KiB
C
612 lines
21 KiB
C
/*
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* H.26L/H.264/AVC/JVT/14496-10/... parser
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* H.264 / AVC / MPEG4 part10 parser.
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#include <assert.h>
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#include <stdint.h>
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#include "libavutil/avutil.h"
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#include "libavutil/error.h"
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#include "libavutil/log.h"
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#include "libavutil/mem.h"
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#include "libavutil/pixfmt.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "h264.h"
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#include "h264data.h"
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#include "internal.h"
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#include "mpegutils.h"
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#include "parser.h"
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typedef struct H264ParseContext {
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H264Context h;
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ParseContext pc;
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H264ParamSets ps;
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H264DSPContext h264dsp;
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int got_first;
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} H264ParseContext;
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static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
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int buf_size)
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{
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int i;
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uint32_t state;
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ParseContext *pc = &p->pc;
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// mb_addr= pc->mb_addr - 1;
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state = pc->state;
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if (state > 13)
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state = 7;
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for (i = 0; i < buf_size; i++) {
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if (state == 7) {
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i += p->h264dsp.startcode_find_candidate(buf + i, buf_size - i);
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if (i < buf_size)
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state = 2;
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} else if (state <= 2) {
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if (buf[i] == 1)
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state ^= 5; // 2->7, 1->4, 0->5
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else if (buf[i])
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state = 7;
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else
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state >>= 1; // 2->1, 1->0, 0->0
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} else if (state <= 5) {
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int nalu_type = buf[i] & 0x1F;
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if (nalu_type == NAL_SEI || nalu_type == NAL_SPS ||
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nalu_type == NAL_PPS || nalu_type == NAL_AUD) {
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if (pc->frame_start_found) {
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i++;
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goto found;
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}
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} else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA ||
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nalu_type == NAL_IDR_SLICE) {
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if (pc->frame_start_found) {
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state += 8;
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continue;
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} else
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pc->frame_start_found = 1;
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}
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state = 7;
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} else {
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// first_mb_in_slice is 0, probably the first nal of a new slice
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if (buf[i] & 0x80)
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goto found;
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state = 7;
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}
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}
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pc->state = state;
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return END_NOT_FOUND;
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found:
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pc->state = 7;
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pc->frame_start_found = 0;
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return i - (state & 5);
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}
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static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb)
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{
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H264PredWeightTable pwt;
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int slice_type_nos = s->pict_type & 3;
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H264ParseContext *p = s->priv_data;
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H264Context *h = &p->h;
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int list_count, ref_count[2];
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if (p->ps.pps->redundant_pic_cnt_present)
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get_ue_golomb(gb); // redundant_pic_count
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if (slice_type_nos == AV_PICTURE_TYPE_B)
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get_bits1(gb); // direct_spatial_mv_pred
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if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
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slice_type_nos, h->picture_structure) < 0)
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return AVERROR_INVALIDDATA;
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if (slice_type_nos != AV_PICTURE_TYPE_I) {
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int list;
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for (list = 0; list < list_count; list++) {
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if (get_bits1(gb)) {
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int index;
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for (index = 0; ; index++) {
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unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
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if (reordering_of_pic_nums_idc < 3)
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get_ue_golomb(gb);
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else if (reordering_of_pic_nums_idc > 3) {
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av_log(h->avctx, AV_LOG_ERROR,
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"illegal reordering_of_pic_nums_idc %d\n",
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reordering_of_pic_nums_idc);
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return AVERROR_INVALIDDATA;
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} else
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break;
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if (index >= ref_count[list]) {
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av_log(h->avctx, AV_LOG_ERROR,
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"reference count %d overflow\n", index);
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return AVERROR_INVALIDDATA;
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}
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}
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}
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}
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}
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if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
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(p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
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ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
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&pwt);
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if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
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int i;
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for (i = 0; i < MAX_MMCO_COUNT; i++) {
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MMCOOpcode opcode = get_ue_golomb_31(gb);
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if (opcode > (unsigned) MMCO_LONG) {
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av_log(h->avctx, AV_LOG_ERROR,
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"illegal memory management control operation %d\n",
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opcode);
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return AVERROR_INVALIDDATA;
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}
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if (opcode == MMCO_END)
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return 0;
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else if (opcode == MMCO_RESET)
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return 1;
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if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
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get_ue_golomb(gb);
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if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
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opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
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get_ue_golomb_31(gb);
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}
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}
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return 0;
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}
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/**
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* Parse NAL units of found picture and decode some basic information.
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*
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* @param s parser context.
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* @param avctx codec context.
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* @param buf buffer with field/frame data.
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* @param buf_size size of the buffer.
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*/
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static inline int parse_nal_units(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t *buf, int buf_size)
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{
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H264ParseContext *p = s->priv_data;
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H264Context *h = &p->h;
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const uint8_t *buf_end = buf + buf_size;
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H2645NAL nal = { NULL };
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unsigned int pps_id;
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unsigned int slice_type;
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int state = -1, got_reset = 0;
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int field_poc[2];
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int ret;
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/* set some sane default values */
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s->pict_type = AV_PICTURE_TYPE_I;
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s->key_frame = 0;
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s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
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h->avctx = avctx;
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ff_h264_reset_sei(h);
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if (!buf_size)
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return 0;
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for (;;) {
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const SPS *sps;
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int src_length, consumed;
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buf = avpriv_find_start_code(buf, buf_end, &state);
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if (buf >= buf_end)
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break;
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--buf;
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src_length = buf_end - buf;
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switch (state & 0x1f) {
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case NAL_SLICE:
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case NAL_IDR_SLICE:
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// Do not walk the whole buffer just to decode slice header
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if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
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/* IDR or disposable slice
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* No need to decode many bytes because MMCOs shall not be present. */
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if (src_length > 60)
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src_length = 60;
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} else {
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/* To decode up to MMCOs */
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if (src_length > 1000)
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src_length = 1000;
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}
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break;
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}
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consumed = ff_h2645_extract_rbsp(buf, src_length, &nal);
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if (consumed < 0)
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break;
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ret = init_get_bits(&nal.gb, nal.data, nal.size * 8);
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if (ret < 0)
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goto fail;
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get_bits1(&nal.gb);
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nal.ref_idc = get_bits(&nal.gb, 2);
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nal.type = get_bits(&nal.gb, 5);
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h->gb = nal.gb;
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h->nal_ref_idc = nal.ref_idc;
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h->nal_unit_type = nal.type;
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switch (h->nal_unit_type) {
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case NAL_SPS:
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ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps);
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break;
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case NAL_PPS:
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ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
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nal.size_bits);
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break;
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case NAL_SEI:
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ff_h264_decode_sei(h);
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break;
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case NAL_IDR_SLICE:
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s->key_frame = 1;
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h->prev_frame_num = 0;
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h->prev_frame_num_offset = 0;
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h->prev_poc_msb =
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h->prev_poc_lsb = 0;
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/* fall through */
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case NAL_SLICE:
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get_ue_golomb(&nal.gb); // skip first_mb_in_slice
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slice_type = get_ue_golomb_31(&nal.gb);
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s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
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if (h->sei_recovery_frame_cnt >= 0) {
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/* key frame, since recovery_frame_cnt is set */
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s->key_frame = 1;
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}
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pps_id = get_ue_golomb(&nal.gb);
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if (pps_id >= MAX_PPS_COUNT) {
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av_log(h->avctx, AV_LOG_ERROR,
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"pps_id %u out of range\n", pps_id);
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goto fail;
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}
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if (!p->ps.pps_list[pps_id]) {
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av_log(h->avctx, AV_LOG_ERROR,
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"non-existing PPS %u referenced\n", pps_id);
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goto fail;
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}
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p->ps.pps = (const PPS*)p->ps.pps_list[pps_id]->data;
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if (!p->ps.sps_list[p->ps.pps->sps_id]) {
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av_log(h->avctx, AV_LOG_ERROR,
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"non-existing SPS %u referenced\n", p->ps.pps->sps_id);
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goto fail;
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}
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p->ps.sps = (SPS*)p->ps.sps_list[p->ps.pps->sps_id]->data;
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h->ps.sps = p->ps.sps;
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h->ps.pps = p->ps.pps;
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sps = p->ps.sps;
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h->frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
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s->coded_width = 16 * sps->mb_width;
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s->coded_height = 16 * sps->mb_height;
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s->width = s->coded_width - (sps->crop_right + sps->crop_left);
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s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
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if (s->width <= 0 || s->height <= 0) {
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s->width = s->coded_width;
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s->height = s->coded_height;
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}
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switch (sps->bit_depth_luma) {
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case 9:
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if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
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else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
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else s->format = AV_PIX_FMT_YUV420P9;
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break;
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case 10:
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if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P10;
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else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
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else s->format = AV_PIX_FMT_YUV420P10;
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break;
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case 8:
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if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P;
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else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
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else s->format = AV_PIX_FMT_YUV420P;
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break;
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default:
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s->format = AV_PIX_FMT_NONE;
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}
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avctx->profile = ff_h264_get_profile(sps);
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avctx->level = sps->level_idc;
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if (sps->frame_mbs_only_flag) {
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h->picture_structure = PICT_FRAME;
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} else {
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if (get_bits1(&nal.gb)) { // field_pic_flag
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h->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
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} else {
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h->picture_structure = PICT_FRAME;
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}
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}
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if (h->nal_unit_type == NAL_IDR_SLICE)
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get_ue_golomb(&nal.gb); /* idr_pic_id */
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if (sps->poc_type == 0) {
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h->poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
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if (p->ps.pps->pic_order_present == 1 &&
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h->picture_structure == PICT_FRAME)
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h->delta_poc_bottom = get_se_golomb(&nal.gb);
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}
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if (sps->poc_type == 1 &&
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!sps->delta_pic_order_always_zero_flag) {
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h->delta_poc[0] = get_se_golomb(&nal.gb);
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if (p->ps.pps->pic_order_present == 1 &&
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h->picture_structure == PICT_FRAME)
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h->delta_poc[1] = get_se_golomb(&nal.gb);
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}
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/* Decode POC of this picture.
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* The prev_ values needed for decoding POC of the next picture are not set here. */
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field_poc[0] = field_poc[1] = INT_MAX;
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ff_init_poc(h, field_poc, &s->output_picture_number);
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/* Continue parsing to check if MMCO_RESET is present.
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* FIXME: MMCO_RESET could appear in non-first slice.
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* Maybe, we should parse all undisposable non-IDR slice of this
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* picture until encountering MMCO_RESET in a slice of it. */
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if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
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got_reset = scan_mmco_reset(s, &nal.gb);
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if (got_reset < 0)
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goto fail;
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}
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/* Set up the prev_ values for decoding POC of the next picture. */
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h->prev_frame_num = got_reset ? 0 : h->frame_num;
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h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
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if (h->nal_ref_idc != 0) {
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if (!got_reset) {
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h->prev_poc_msb = h->poc_msb;
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h->prev_poc_lsb = h->poc_lsb;
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} else {
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h->prev_poc_msb = 0;
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h->prev_poc_lsb =
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h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
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}
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}
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if (sps->pic_struct_present_flag) {
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switch (h->sei_pic_struct) {
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case SEI_PIC_STRUCT_TOP_FIELD:
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case SEI_PIC_STRUCT_BOTTOM_FIELD:
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s->repeat_pict = 0;
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break;
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case SEI_PIC_STRUCT_FRAME:
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case SEI_PIC_STRUCT_TOP_BOTTOM:
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case SEI_PIC_STRUCT_BOTTOM_TOP:
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s->repeat_pict = 1;
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break;
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case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
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case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
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s->repeat_pict = 2;
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break;
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case SEI_PIC_STRUCT_FRAME_DOUBLING:
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s->repeat_pict = 3;
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break;
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case SEI_PIC_STRUCT_FRAME_TRIPLING:
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s->repeat_pict = 5;
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break;
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default:
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s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
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break;
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}
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} else {
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s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
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}
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if (h->picture_structure == PICT_FRAME) {
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s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
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if (sps->pic_struct_present_flag) {
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switch (h->sei_pic_struct) {
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case SEI_PIC_STRUCT_TOP_BOTTOM:
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case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
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s->field_order = AV_FIELD_TT;
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break;
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case SEI_PIC_STRUCT_BOTTOM_TOP:
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case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
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s->field_order = AV_FIELD_BB;
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break;
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default:
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s->field_order = AV_FIELD_PROGRESSIVE;
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break;
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}
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} else {
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if (field_poc[0] < field_poc[1])
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s->field_order = AV_FIELD_TT;
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else if (field_poc[0] > field_poc[1])
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s->field_order = AV_FIELD_BB;
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else
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s->field_order = AV_FIELD_PROGRESSIVE;
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}
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} else {
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if (h->picture_structure == PICT_TOP_FIELD)
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s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
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else
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s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
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s->field_order = AV_FIELD_UNKNOWN;
|
|
}
|
|
|
|
av_freep(&nal.rbsp_buffer);
|
|
return 0; /* no need to evaluate the rest */
|
|
}
|
|
buf += consumed;
|
|
}
|
|
/* didn't find a picture! */
|
|
av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
|
|
fail:
|
|
av_freep(&nal.rbsp_buffer);
|
|
return -1;
|
|
}
|
|
|
|
static int h264_parse(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
H264ParseContext *p = s->priv_data;
|
|
H264Context *h = &p->h;
|
|
ParseContext *pc = &p->pc;
|
|
int next;
|
|
|
|
if (!p->got_first) {
|
|
p->got_first = 1;
|
|
if (avctx->extradata_size) {
|
|
h->avctx = avctx;
|
|
// must be done like in the decoder.
|
|
// otherwise opening the parser, creating extradata,
|
|
// and then closing and opening again
|
|
// will cause has_b_frames to be always set.
|
|
// NB: estimate_timings_from_pts behaves exactly like this.
|
|
if (!avctx->has_b_frames)
|
|
h->low_delay = 1;
|
|
ff_h264_decode_extradata(h);
|
|
}
|
|
}
|
|
|
|
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
|
|
next = buf_size;
|
|
} else {
|
|
next = h264_find_frame_end(p, buf, buf_size);
|
|
|
|
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
if (next < 0 && next != END_NOT_FOUND) {
|
|
assert(pc->last_index + next >= 0);
|
|
h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
|
|
}
|
|
}
|
|
|
|
parse_nal_units(s, avctx, buf, buf_size);
|
|
|
|
if (h->sei_cpb_removal_delay >= 0) {
|
|
s->dts_sync_point = h->sei_buffering_period_present;
|
|
s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
|
|
s->pts_dts_delta = h->sei_dpb_output_delay;
|
|
} else {
|
|
s->dts_sync_point = INT_MIN;
|
|
s->dts_ref_dts_delta = INT_MIN;
|
|
s->pts_dts_delta = INT_MIN;
|
|
}
|
|
|
|
if (s->flags & PARSER_FLAG_ONCE) {
|
|
s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
|
|
}
|
|
|
|
*poutbuf = buf;
|
|
*poutbuf_size = buf_size;
|
|
return next;
|
|
}
|
|
|
|
static int h264_split(AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
int i;
|
|
uint32_t state = -1;
|
|
int has_sps = 0;
|
|
|
|
for (i = 0; i <= buf_size; i++) {
|
|
if ((state & 0xFFFFFF1F) == 0x107)
|
|
has_sps = 1;
|
|
/* if((state&0xFFFFFF1F) == 0x101 ||
|
|
* (state&0xFFFFFF1F) == 0x102 ||
|
|
* (state&0xFFFFFF1F) == 0x105) {
|
|
* }
|
|
*/
|
|
if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 &&
|
|
(state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 &&
|
|
(state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d &&
|
|
(state & 0xFFFFFF1F) != 0x10f) {
|
|
if (has_sps) {
|
|
while (i > 4 && buf[i - 5] == 0)
|
|
i--;
|
|
return i - 4;
|
|
}
|
|
}
|
|
if (i < buf_size)
|
|
state = (state << 8) | buf[i];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void h264_close(AVCodecParserContext *s)
|
|
{
|
|
H264ParseContext *p = s->priv_data;
|
|
H264Context *h = &p->h;
|
|
ParseContext *pc = &p->pc;
|
|
int i;
|
|
|
|
av_free(pc->buffer);
|
|
ff_h264_free_context(h);
|
|
|
|
for (i = 0; i < FF_ARRAY_ELEMS(p->ps.sps_list); i++)
|
|
av_buffer_unref(&p->ps.sps_list[i]);
|
|
|
|
for (i = 0; i < FF_ARRAY_ELEMS(p->ps.pps_list); i++)
|
|
av_buffer_unref(&p->ps.pps_list[i]);
|
|
}
|
|
|
|
static av_cold int init(AVCodecParserContext *s)
|
|
{
|
|
H264ParseContext *p = s->priv_data;
|
|
H264Context *h = &p->h;
|
|
|
|
h->slice_ctx = av_mallocz(sizeof(*h->slice_ctx));
|
|
if (!h->slice_ctx)
|
|
return 0;
|
|
h->nb_slice_ctx = 1;
|
|
|
|
h->slice_context_count = 1;
|
|
ff_h264dsp_init(&p->h264dsp, 8, 1);
|
|
return 0;
|
|
}
|
|
|
|
AVCodecParser ff_h264_parser = {
|
|
.codec_ids = { AV_CODEC_ID_H264 },
|
|
.priv_data_size = sizeof(H264ParseContext),
|
|
.parser_init = init,
|
|
.parser_parse = h264_parse,
|
|
.parser_close = h264_close,
|
|
.split = h264_split,
|
|
};
|