forked from KolibriOS/kolibrios
564 lines
19 KiB
C
564 lines
19 KiB
C
/*
|
|
* H.26L/H.264/AVC/JVT/14496-10/... parser
|
|
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* H.264 / AVC / MPEG4 part10 parser.
|
|
* @author Michael Niedermayer <michaelni@gmx.at>
|
|
*/
|
|
|
|
#define UNCHECKED_BITSTREAM_READER 1
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "parser.h"
|
|
#include "h264data.h"
|
|
#include "golomb.h"
|
|
#include "internal.h"
|
|
|
|
|
|
static int h264_find_frame_end(H264Context *h, const uint8_t *buf,
|
|
int buf_size)
|
|
{
|
|
int i, j;
|
|
uint32_t state;
|
|
ParseContext *pc = &h->parse_context;
|
|
int next_avc= h->is_avc ? 0 : buf_size;
|
|
|
|
// mb_addr= pc->mb_addr - 1;
|
|
state = pc->state;
|
|
if (state > 13)
|
|
state = 7;
|
|
|
|
if (h->is_avc && !h->nal_length_size)
|
|
av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
|
|
|
|
for (i = 0; i < buf_size; i++) {
|
|
if (i >= next_avc) {
|
|
int nalsize = 0;
|
|
i = next_avc;
|
|
for (j = 0; j < h->nal_length_size; j++)
|
|
nalsize = (nalsize << 8) | buf[i++];
|
|
if (nalsize <= 0 || nalsize > buf_size - i) {
|
|
av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
|
|
return buf_size;
|
|
}
|
|
next_avc = i + nalsize;
|
|
state = 5;
|
|
}
|
|
|
|
if (state == 7) {
|
|
i += h->h264dsp.h264_find_start_code_candidate(buf + i, next_avc - i);
|
|
if (i < next_avc)
|
|
state = 2;
|
|
} else if (state <= 2) {
|
|
if (buf[i] == 1)
|
|
state ^= 5; // 2->7, 1->4, 0->5
|
|
else if (buf[i])
|
|
state = 7;
|
|
else
|
|
state >>= 1; // 2->1, 1->0, 0->0
|
|
} else if (state <= 5) {
|
|
int v = buf[i] & 0x1F;
|
|
if (v == 6 || v == 7 || v == 8 || v == 9) {
|
|
if (pc->frame_start_found) {
|
|
i++;
|
|
goto found;
|
|
}
|
|
} else if (v == 1 || v == 2 || v == 5) {
|
|
state += 8;
|
|
continue;
|
|
}
|
|
state = 7;
|
|
} else {
|
|
h->parse_history[h->parse_history_count++]= buf[i];
|
|
if (h->parse_history_count>3) {
|
|
unsigned int mb, last_mb= h->parse_last_mb;
|
|
GetBitContext gb;
|
|
|
|
init_get_bits(&gb, h->parse_history, 8*h->parse_history_count);
|
|
h->parse_history_count=0;
|
|
mb= get_ue_golomb_long(&gb);
|
|
last_mb= h->parse_last_mb;
|
|
h->parse_last_mb= mb;
|
|
if (pc->frame_start_found) {
|
|
if (mb <= last_mb)
|
|
goto found;
|
|
} else
|
|
pc->frame_start_found = 1;
|
|
state = 7;
|
|
}
|
|
}
|
|
}
|
|
pc->state = state;
|
|
if (h->is_avc)
|
|
return next_avc;
|
|
return END_NOT_FOUND;
|
|
|
|
found:
|
|
pc->state = 7;
|
|
pc->frame_start_found = 0;
|
|
if (h->is_avc)
|
|
return next_avc;
|
|
return i - (state & 5) - 3 * (state > 7);
|
|
}
|
|
|
|
static int scan_mmco_reset(AVCodecParserContext *s)
|
|
{
|
|
H264Context *h = s->priv_data;
|
|
|
|
h->slice_type_nos = s->pict_type & 3;
|
|
|
|
if (h->pps.redundant_pic_cnt_present)
|
|
get_ue_golomb(&h->gb); // redundant_pic_count
|
|
|
|
if (ff_set_ref_count(h) < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (h->slice_type_nos != AV_PICTURE_TYPE_I) {
|
|
int list;
|
|
for (list = 0; list < h->list_count; list++) {
|
|
if (get_bits1(&h->gb)) {
|
|
int index;
|
|
for (index = 0; ; index++) {
|
|
unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
|
|
|
|
if (reordering_of_pic_nums_idc < 3)
|
|
get_ue_golomb(&h->gb);
|
|
else if (reordering_of_pic_nums_idc > 3) {
|
|
av_log(h->avctx, AV_LOG_ERROR,
|
|
"illegal reordering_of_pic_nums_idc %d\n",
|
|
reordering_of_pic_nums_idc);
|
|
return AVERROR_INVALIDDATA;
|
|
} else
|
|
break;
|
|
|
|
if (index >= h->ref_count[list]) {
|
|
av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((h->pps.weighted_pred && h->slice_type_nos == AV_PICTURE_TYPE_P) ||
|
|
(h->pps.weighted_bipred_idc == 1 && h->slice_type_nos == AV_PICTURE_TYPE_B))
|
|
ff_pred_weight_table(h);
|
|
|
|
if (get_bits1(&h->gb)) { // adaptive_ref_pic_marking_mode_flag
|
|
int i;
|
|
for (i = 0; i < MAX_MMCO_COUNT; i++) {
|
|
MMCOOpcode opcode = get_ue_golomb_31(&h->gb);
|
|
if (opcode > (unsigned) MMCO_LONG) {
|
|
av_log(h->avctx, AV_LOG_ERROR,
|
|
"illegal memory management control operation %d\n",
|
|
opcode);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (opcode == MMCO_END)
|
|
return 0;
|
|
else if (opcode == MMCO_RESET)
|
|
return 1;
|
|
|
|
if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
|
|
get_ue_golomb(&h->gb);
|
|
if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
|
|
opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
|
|
get_ue_golomb_31(&h->gb);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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 inline int parse_nal_units(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
H264Context *h = s->priv_data;
|
|
const uint8_t *buf_end = buf + buf_size;
|
|
unsigned int pps_id;
|
|
unsigned int slice_type;
|
|
int state = -1, got_reset = 0;
|
|
const uint8_t *ptr;
|
|
int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
|
|
int field_poc[2];
|
|
|
|
/* set some sane default values */
|
|
s->pict_type = AV_PICTURE_TYPE_I;
|
|
s->key_frame = 0;
|
|
s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
|
|
|
|
h->avctx = avctx;
|
|
ff_h264_reset_sei(h);
|
|
h->sei_fpa.frame_packing_arrangement_cancel_flag = -1;
|
|
|
|
if (!buf_size)
|
|
return 0;
|
|
|
|
for (;;) {
|
|
int src_length, dst_length, consumed, nalsize = 0;
|
|
if (h->is_avc) {
|
|
int i;
|
|
if (h->nal_length_size >= buf_end - buf) break;
|
|
nalsize = 0;
|
|
for (i = 0; i < h->nal_length_size; i++)
|
|
nalsize = (nalsize << 8) | *buf++;
|
|
if (nalsize <= 0 || nalsize > buf_end - buf) {
|
|
av_log(h->avctx, AV_LOG_ERROR, "AVC: nal size %d\n", nalsize);
|
|
break;
|
|
}
|
|
src_length = nalsize;
|
|
} else {
|
|
buf = avpriv_find_start_code(buf, buf_end, &state);
|
|
if (buf >= buf_end)
|
|
break;
|
|
--buf;
|
|
src_length = buf_end - buf;
|
|
}
|
|
switch (state & 0x1f) {
|
|
case NAL_SLICE:
|
|
case NAL_IDR_SLICE:
|
|
// Do not walk the whole buffer just to decode slice header
|
|
if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
|
|
/* IDR or disposable slice
|
|
* No need to decode many bytes because MMCOs shall not be present. */
|
|
if (src_length > 60)
|
|
src_length = 60;
|
|
} else {
|
|
/* To decode up to MMCOs */
|
|
if (src_length > 1000)
|
|
src_length = 1000;
|
|
}
|
|
break;
|
|
}
|
|
ptr = ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
|
|
if (ptr == NULL || dst_length < 0)
|
|
break;
|
|
|
|
init_get_bits(&h->gb, ptr, 8 * dst_length);
|
|
switch (h->nal_unit_type) {
|
|
case NAL_SPS:
|
|
ff_h264_decode_seq_parameter_set(h);
|
|
break;
|
|
case NAL_PPS:
|
|
ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
|
|
break;
|
|
case NAL_SEI:
|
|
ff_h264_decode_sei(h);
|
|
break;
|
|
case NAL_IDR_SLICE:
|
|
s->key_frame = 1;
|
|
|
|
h->prev_frame_num = 0;
|
|
h->prev_frame_num_offset = 0;
|
|
h->prev_poc_msb =
|
|
h->prev_poc_lsb = 0;
|
|
/* fall through */
|
|
case NAL_SLICE:
|
|
get_ue_golomb_long(&h->gb); // skip first_mb_in_slice
|
|
slice_type = get_ue_golomb_31(&h->gb);
|
|
s->pict_type = golomb_to_pict_type[slice_type % 5];
|
|
if (h->sei_recovery_frame_cnt >= 0) {
|
|
/* key frame, since recovery_frame_cnt is set */
|
|
s->key_frame = 1;
|
|
}
|
|
pps_id = get_ue_golomb(&h->gb);
|
|
if (pps_id >= MAX_PPS_COUNT) {
|
|
av_log(h->avctx, AV_LOG_ERROR,
|
|
"pps_id out of range\n");
|
|
return -1;
|
|
}
|
|
if (!h->pps_buffers[pps_id]) {
|
|
av_log(h->avctx, AV_LOG_ERROR,
|
|
"non-existing PPS referenced\n");
|
|
return -1;
|
|
}
|
|
h->pps = *h->pps_buffers[pps_id];
|
|
if (!h->sps_buffers[h->pps.sps_id]) {
|
|
av_log(h->avctx, AV_LOG_ERROR,
|
|
"non-existing SPS referenced\n");
|
|
return -1;
|
|
}
|
|
h->sps = *h->sps_buffers[h->pps.sps_id];
|
|
h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num);
|
|
|
|
if(h->sps.ref_frame_count <= 1 && h->pps.ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
|
|
s->key_frame = 1;
|
|
|
|
avctx->profile = ff_h264_get_profile(&h->sps);
|
|
avctx->level = h->sps.level_idc;
|
|
|
|
if (h->sps.frame_mbs_only_flag) {
|
|
h->picture_structure = PICT_FRAME;
|
|
} else {
|
|
if (get_bits1(&h->gb)) { // field_pic_flag
|
|
h->picture_structure = PICT_TOP_FIELD + get_bits1(&h->gb); // bottom_field_flag
|
|
} else {
|
|
h->picture_structure = PICT_FRAME;
|
|
}
|
|
}
|
|
|
|
if (h->nal_unit_type == NAL_IDR_SLICE)
|
|
get_ue_golomb(&h->gb); /* idr_pic_id */
|
|
if (h->sps.poc_type == 0) {
|
|
h->poc_lsb = get_bits(&h->gb, h->sps.log2_max_poc_lsb);
|
|
|
|
if (h->pps.pic_order_present == 1 &&
|
|
h->picture_structure == PICT_FRAME)
|
|
h->delta_poc_bottom = get_se_golomb(&h->gb);
|
|
}
|
|
|
|
if (h->sps.poc_type == 1 &&
|
|
!h->sps.delta_pic_order_always_zero_flag) {
|
|
h->delta_poc[0] = get_se_golomb(&h->gb);
|
|
|
|
if (h->pps.pic_order_present == 1 &&
|
|
h->picture_structure == PICT_FRAME)
|
|
h->delta_poc[1] = get_se_golomb(&h->gb);
|
|
}
|
|
|
|
/* Decode POC of this picture.
|
|
* The prev_ values needed for decoding POC of the next picture are not set here. */
|
|
field_poc[0] = field_poc[1] = INT_MAX;
|
|
ff_init_poc(h, field_poc, &s->output_picture_number);
|
|
|
|
/* Continue parsing to check if MMCO_RESET is present.
|
|
* FIXME: MMCO_RESET could appear in non-first slice.
|
|
* Maybe, we should parse all undisposable non-IDR slice of this
|
|
* picture until encountering MMCO_RESET in a slice of it. */
|
|
if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
|
|
got_reset = scan_mmco_reset(s);
|
|
if (got_reset < 0)
|
|
return got_reset;
|
|
}
|
|
|
|
/* Set up the prev_ values for decoding POC of the next picture. */
|
|
h->prev_frame_num = got_reset ? 0 : h->frame_num;
|
|
h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
|
|
if (h->nal_ref_idc != 0) {
|
|
if (!got_reset) {
|
|
h->prev_poc_msb = h->poc_msb;
|
|
h->prev_poc_lsb = h->poc_lsb;
|
|
} else {
|
|
h->prev_poc_msb = 0;
|
|
h->prev_poc_lsb =
|
|
h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
|
|
}
|
|
}
|
|
|
|
if (h->sps.pic_struct_present_flag) {
|
|
switch (h->sei_pic_struct) {
|
|
case SEI_PIC_STRUCT_TOP_FIELD:
|
|
case SEI_PIC_STRUCT_BOTTOM_FIELD:
|
|
s->repeat_pict = 0;
|
|
break;
|
|
case SEI_PIC_STRUCT_FRAME:
|
|
case SEI_PIC_STRUCT_TOP_BOTTOM:
|
|
case SEI_PIC_STRUCT_BOTTOM_TOP:
|
|
s->repeat_pict = 1;
|
|
break;
|
|
case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
|
|
case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
|
|
s->repeat_pict = 2;
|
|
break;
|
|
case SEI_PIC_STRUCT_FRAME_DOUBLING:
|
|
s->repeat_pict = 3;
|
|
break;
|
|
case SEI_PIC_STRUCT_FRAME_TRIPLING:
|
|
s->repeat_pict = 5;
|
|
break;
|
|
default:
|
|
s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
|
|
break;
|
|
}
|
|
} else {
|
|
s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
|
|
}
|
|
|
|
if (h->picture_structure == PICT_FRAME) {
|
|
s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
|
|
if (h->sps.pic_struct_present_flag) {
|
|
switch (h->sei_pic_struct) {
|
|
case SEI_PIC_STRUCT_TOP_BOTTOM:
|
|
case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
|
|
s->field_order = AV_FIELD_TT;
|
|
break;
|
|
case SEI_PIC_STRUCT_BOTTOM_TOP:
|
|
case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
|
|
s->field_order = AV_FIELD_BB;
|
|
break;
|
|
default:
|
|
s->field_order = AV_FIELD_PROGRESSIVE;
|
|
break;
|
|
}
|
|
} else {
|
|
if (field_poc[0] < field_poc[1])
|
|
s->field_order = AV_FIELD_TT;
|
|
else if (field_poc[0] > field_poc[1])
|
|
s->field_order = AV_FIELD_BB;
|
|
else
|
|
s->field_order = AV_FIELD_PROGRESSIVE;
|
|
}
|
|
} else {
|
|
if (h->picture_structure == PICT_TOP_FIELD)
|
|
s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
|
|
else
|
|
s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
|
|
s->field_order = AV_FIELD_UNKNOWN;
|
|
}
|
|
|
|
return 0; /* no need to evaluate the rest */
|
|
}
|
|
buf += h->is_avc ? nalsize : consumed;
|
|
}
|
|
if (q264)
|
|
return 0;
|
|
/* didn't find a picture! */
|
|
av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
|
|
return -1;
|
|
}
|
|
|
|
static int h264_parse(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
H264Context *h = s->priv_data;
|
|
ParseContext *pc = &h->parse_context;
|
|
int next;
|
|
|
|
if (!h->got_first) {
|
|
h->got_first = 1;
|
|
if (avctx->extradata_size) {
|
|
h->avctx = avctx;
|
|
// must be done like in decoder, otherwise opening the parser,
|
|
// letting it create extradata and then closing and opening again
|
|
// will cause has_b_frames to be always set.
|
|
// Note that estimate_timings_from_pts does exactly this.
|
|
if (!avctx->has_b_frames)
|
|
h->low_delay = 1;
|
|
ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size);
|
|
}
|
|
}
|
|
|
|
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
|
|
next = buf_size;
|
|
} else {
|
|
next = h264_find_frame_end(h, 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) {
|
|
av_assert1(pc->last_index + next >= 0);
|
|
h264_find_frame_end(h, &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) != 0x107 &&
|
|
(state & 0xFFFFFF1F) != 0x108 && (state & 0xFFFFFF1F) != 0x109) {
|
|
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 close(AVCodecParserContext *s)
|
|
{
|
|
H264Context *h = s->priv_data;
|
|
ParseContext *pc = &h->parse_context;
|
|
|
|
av_free(pc->buffer);
|
|
ff_h264_free_context(h);
|
|
}
|
|
|
|
static av_cold int init(AVCodecParserContext *s)
|
|
{
|
|
H264Context *h = s->priv_data;
|
|
h->thread_context[0] = h;
|
|
h->slice_context_count = 1;
|
|
ff_h264dsp_init(&h->h264dsp, 8, 1);
|
|
return 0;
|
|
}
|
|
|
|
AVCodecParser ff_h264_parser = {
|
|
.codec_ids = { AV_CODEC_ID_H264 },
|
|
.priv_data_size = sizeof(H264Context),
|
|
.parser_init = init,
|
|
.parser_parse = h264_parse,
|
|
.parser_close = close,
|
|
.split = h264_split,
|
|
};
|