FFmpeg  4.3.7
h264_redundant_pps_bsf.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include <string.h>
20 
21 #include "libavutil/common.h"
22 #include "libavutil/mem.h"
23 
24 #include "bsf.h"
25 #include "bsf_internal.h"
26 #include "cbs.h"
27 #include "cbs_h264.h"
28 #include "h264.h"
29 
30 
31 typedef struct H264RedundantPPSContext {
34 
36 
41 
42 
44  H264RawPPS *pps)
45 {
46  // Record the current value of pic_init_qp in order to fix up
47  // following slices, then overwrite with the global value.
49  pps->pic_init_qp_minus26 = ctx->global_pic_init_qp - 26;
50 
51  // Some PPSs have this set, so it must be set in all of them.
52  // (Slices which do not use such a PPS on input will still have
53  // *_weight_l*flag as zero and therefore write equivalently.)
54  pps->weighted_pred_flag = 1;
55 
56  return 0;
57 }
58 
60  H264RawSliceHeader *slice)
61 {
62  int qp;
63 
64  qp = ctx->current_pic_init_qp + slice->slice_qp_delta;
65  slice->slice_qp_delta = qp - ctx->global_pic_init_qp;
66 
67  return 0;
68 }
69 
71 {
74  int au_has_sps;
75  int err, i;
76 
77  err = ff_bsf_get_packet_ref(bsf, pkt);
78  if (err < 0)
79  return err;
80 
81  err = ff_cbs_read_packet(ctx->input, au, pkt);
82  if (err < 0)
83  goto fail;
84 
85  au_has_sps = 0;
86  for (i = 0; i < au->nb_units; i++) {
87  CodedBitstreamUnit *nal = &au->units[i];
88 
89  if (nal->type == H264_NAL_SPS)
90  au_has_sps = 1;
91  if (nal->type == H264_NAL_PPS) {
92  err = h264_redundant_pps_fixup_pps(ctx, nal->content);
93  if (err < 0)
94  goto fail;
95  if (!au_has_sps) {
96  av_log(bsf, AV_LOG_VERBOSE, "Deleting redundant PPS "
97  "at %"PRId64".\n", pkt->pts);
98  ff_cbs_delete_unit(ctx->input, au, i);
99  i--;
100  continue;
101  }
102  }
103  if (nal->type == H264_NAL_SLICE ||
104  nal->type == H264_NAL_IDR_SLICE) {
105  H264RawSlice *slice = nal->content;
107  }
108  }
109 
110  err = ff_cbs_write_packet(ctx->output, pkt, au);
111  if (err < 0)
112  goto fail;
113 
114  err = 0;
115 fail:
116  ff_cbs_fragment_reset(ctx->output, au);
117  if (err < 0)
118  av_packet_unref(pkt);
119 
120  return err;
121 }
122 
124 {
127  int err, i;
128 
129  err = ff_cbs_init(&ctx->input, AV_CODEC_ID_H264, bsf);
130  if (err < 0)
131  return err;
132 
133  err = ff_cbs_init(&ctx->output, AV_CODEC_ID_H264, bsf);
134  if (err < 0)
135  return err;
136 
137  ctx->global_pic_init_qp = 26;
138 
139  if (bsf->par_in->extradata) {
140  err = ff_cbs_read_extradata(ctx->input, au, bsf->par_in);
141  if (err < 0) {
142  av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
143  goto fail;
144  }
145 
146  for (i = 0; i < au->nb_units; i++) {
147  if (au->units[i].type == H264_NAL_PPS) {
148  err = h264_redundant_pps_fixup_pps(ctx, au->units[i].content);
149  if (err < 0)
150  goto fail;
151  }
152  }
153 
155  err = ff_cbs_write_extradata(ctx->output, bsf->par_out, au);
156  if (err < 0) {
157  av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
158  goto fail;
159  }
160  }
161 
162  err = 0;
163 fail:
164  ff_cbs_fragment_reset(ctx->output, au);
165  return err;
166 }
167 
169 {
172 }
173 
175 {
177 
179  ff_cbs_close(&ctx->input);
180  ff_cbs_close(&ctx->output);
181 }
182 
185 };
186 
188  .name = "h264_redundant_pps",
189  .priv_data_size = sizeof(H264RedundantPPSContext),
192  .close = &h264_redundant_pps_close,
195 };
static int h264_redundant_pps_init(AVBSFContext *bsf)
int nb_units
Number of units in this fragment.
Definition: cbs.h:147
AVCodecParameters * par_out
Parameters of the output stream.
Definition: bsf.h:83
static void flush(AVCodecContext *avctx)
Memory handling functions.
int ff_cbs_write_packet(CodedBitstreamContext *ctx, AVPacket *pkt, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to a packet.
Definition: cbs.c:401
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int ff_cbs_init(CodedBitstreamContext **ctx_ptr, enum AVCodecID codec_id, void *log_ctx)
Create and initialise a new context for the given codec.
Definition: cbs.c:74
void ff_cbs_delete_unit(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, int position)
Delete a unit from a fragment and free all memory it uses.
Definition: cbs.c:799
CodedBitstreamUnitType type
Codec-specific type of this unit.
Definition: cbs.h:68
The bitstream filter state.
Definition: bsf.h:49
static AVPacket pkt
void * priv_data
Opaque filter-specific private data.
Definition: bsf.h:70
const AVBitStreamFilter ff_h264_redundant_pps_bsf
CodedBitstreamContext * input
uint8_t weighted_pred_flag
Definition: cbs_h264.h:204
static int h264_redundant_pps_fixup_slice(H264RedundantPPSContext *ctx, H264RawSliceHeader *slice)
int8_t slice_qp_delta
Definition: cbs_h264.h:417
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:196
int ff_cbs_read_packet(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVPacket *pkt)
Read the data bitstream from a packet into a fragment, then split into units and decompose.
Definition: cbs.c:242
const char * name
Definition: bsf.h:99
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx, H264RawPPS *pps)
Coded bitstream unit structure.
Definition: cbs.h:64
void * content
Pointer to the decomposed form of this unit.
Definition: cbs.h:101
CodedBitstreamUnit * units
Pointer to an array of units of length nb_units_allocated.
Definition: cbs.h:162
#define av_log(a,...)
void ff_cbs_fragment_free(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Free the units array of a fragment in addition to what ff_cbs_fragment_reset does.
Definition: cbs.c:157
H.264 common definitions.
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define fail()
Definition: checkasm.h:123
int ff_cbs_write_extradata(CodedBitstreamContext *ctx, AVCodecParameters *par, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to the extradata in codec parameters.
Definition: cbs.c:376
AVFormatContext * ctx
Definition: movenc.c:48
CodedBitstreamContext * output
static void h264_redundant_pps_flush(AVBSFContext *bsf)
static void h264_redundant_pps_close(AVBSFContext *bsf)
Coded bitstream fragment structure, combining one or more units.
Definition: cbs.h:116
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:605
void ff_cbs_fragment_reset(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Free the units contained in a fragment as well as the fragment&#39;s own data buffer, but not the units a...
Definition: cbs.c:142
static int FUNC() pps(CodedBitstreamContext *ctx, RWContext *rw, H264RawPPS *current)
Context structure for coded bitstream operations.
Definition: cbs.h:168
void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
Close a context and free all internal state.
Definition: cbs.c:115
int ff_cbs_read_extradata(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVCodecParameters *par)
Read the extradata bitstream found in codec parameters into a fragment, then split into units and dec...
Definition: cbs.c:224
CodedBitstreamFragment access_unit
common internal and external API header
static enum AVCodecID codec_ids[]
static enum AVCodecID h264_redundant_pps_codec_ids[]
H264RawSliceHeader header
Definition: cbs_h264.h:430
static int h264_redundant_pps_filter(AVBSFContext *bsf, AVPacket *pkt)
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
int8_t pic_init_qp_minus26
Definition: cbs_h264.h:207
This structure stores compressed data.
Definition: packet.h:332
AVCodecParameters * par_in
Parameters of the input stream.
Definition: bsf.h:77
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:249
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348