1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* 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 <string.h>
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "bsf.h"
#include "bsf_internal.h"
#include "cbs.h"
#include "cbs_h264.h"
#include "h264.h"
typedef struct H264RedundantPPSContext {
CodedBitstreamContext *input;
CodedBitstreamContext *output;
CodedBitstreamFragment access_unit;
int global_pic_init_qp;
int current_pic_init_qp;
int extradata_pic_init_qp;
} H264RedundantPPSContext;
static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx,
H264RawPPS *pps)
{
// Record the current value of pic_init_qp in order to fix up
// following slices, then overwrite with the global value.
ctx->current_pic_init_qp = pps->pic_init_qp_minus26 + 26;
pps->pic_init_qp_minus26 = ctx->global_pic_init_qp - 26;
// Some PPSs have this set, so it must be set in all of them.
// (Slices which do not use such a PPS on input will still have
// *_weight_l*flag as zero and therefore write equivalently.)
pps->weighted_pred_flag = 1;
return 0;
}
static int h264_redundant_pps_fixup_slice(H264RedundantPPSContext *ctx,
H264RawSliceHeader *slice)
{
int qp;
qp = ctx->current_pic_init_qp + slice->slice_qp_delta;
slice->slice_qp_delta = qp - ctx->global_pic_init_qp;
return 0;
}
static int h264_redundant_pps_filter(AVBSFContext *bsf, AVPacket *pkt)
{
H264RedundantPPSContext *ctx = bsf->priv_data;
CodedBitstreamFragment *au = &ctx->access_unit;
int au_has_sps;
int err, i;
err = ff_bsf_get_packet_ref(bsf, pkt);
if (err < 0)
return err;
err = ff_cbs_read_packet(ctx->input, au, pkt);
if (err < 0)
goto fail;
au_has_sps = 0;
for (i = 0; i < au->nb_units; i++) {
CodedBitstreamUnit *nal = &au->units[i];
if (nal->type == H264_NAL_SPS)
au_has_sps = 1;
if (nal->type == H264_NAL_PPS) {
err = h264_redundant_pps_fixup_pps(ctx, nal->content);
if (err < 0)
goto fail;
if (!au_has_sps) {
av_log(bsf, AV_LOG_VERBOSE, "Deleting redundant PPS "
"at %"PRId64".\n", pkt->pts);
ff_cbs_delete_unit(ctx->input, au, i);
i--;
continue;
}
}
if (nal->type == H264_NAL_SLICE ||
nal->type == H264_NAL_IDR_SLICE) {
H264RawSlice *slice = nal->content;
h264_redundant_pps_fixup_slice(ctx, &slice->header);
}
}
err = ff_cbs_write_packet(ctx->output, pkt, au);
if (err < 0)
goto fail;
err = 0;
fail:
ff_cbs_fragment_reset(ctx->output, au);
if (err < 0)
av_packet_unref(pkt);
return err;
}
static int h264_redundant_pps_init(AVBSFContext *bsf)
{
H264RedundantPPSContext *ctx = bsf->priv_data;
CodedBitstreamFragment *au = &ctx->access_unit;
int err, i;
err = ff_cbs_init(&ctx->input, AV_CODEC_ID_H264, bsf);
if (err < 0)
return err;
err = ff_cbs_init(&ctx->output, AV_CODEC_ID_H264, bsf);
if (err < 0)
return err;
ctx->global_pic_init_qp = 26;
if (bsf->par_in->extradata) {
err = ff_cbs_read_extradata(ctx->input, au, bsf->par_in);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
goto fail;
}
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == H264_NAL_PPS) {
err = h264_redundant_pps_fixup_pps(ctx, au->units[i].content);
if (err < 0)
goto fail;
}
}
ctx->extradata_pic_init_qp = ctx->current_pic_init_qp;
err = ff_cbs_write_extradata(ctx->output, bsf->par_out, au);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
goto fail;
}
}
err = 0;
fail:
ff_cbs_fragment_reset(ctx->output, au);
return err;
}
static void h264_redundant_pps_flush(AVBSFContext *bsf)
{
H264RedundantPPSContext *ctx = bsf->priv_data;
ctx->current_pic_init_qp = ctx->extradata_pic_init_qp;
}
static void h264_redundant_pps_close(AVBSFContext *bsf)
{
H264RedundantPPSContext *ctx = bsf->priv_data;
ff_cbs_fragment_free(ctx->input, &ctx->access_unit);
ff_cbs_close(&ctx->input);
ff_cbs_close(&ctx->output);
}
static const enum AVCodecID h264_redundant_pps_codec_ids[] = {
AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
};
const AVBitStreamFilter ff_h264_redundant_pps_bsf = {
.name = "h264_redundant_pps",
.priv_data_size = sizeof(H264RedundantPPSContext),
.init = &h264_redundant_pps_init,
.flush = &h264_redundant_pps_flush,
.close = &h264_redundant_pps_close,
.filter = &h264_redundant_pps_filter,
.codec_ids = h264_redundant_pps_codec_ids,
};
|
