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vp9_superframe_bsf.c
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1 /*
2  * Vp9 invisible (alt-ref) frame to superframe merge bitstream filter
3  * Copyright (c) 2016 Ronald S. Bultje <rsbultje@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/avassert.h"
23 #include "avcodec.h"
24 #include "bsf.h"
25 #include "get_bits.h"
26 
27 #define MAX_CACHE 8
28 typedef struct VP9BSFContext {
29  int n_cache;
30  struct CachedBuf {
32  int size;
33  } cache[MAX_CACHE];
35 
36 static void stats(const struct CachedBuf *in, int n_in,
37  unsigned *_max, unsigned *_sum)
38 {
39  int n;
40  unsigned max = 0, sum = 0;
41 
42  for (n = 0; n < n_in; n++) {
43  unsigned sz = in[n].size;
44 
45  if (sz > max)
46  max = sz;
47  sum += sz;
48  }
49 
50  *_max = max;
51  *_sum = sum;
52 }
53 
54 static int merge_superframe(const struct CachedBuf *in, int n_in, AVPacket *out)
55 {
56  unsigned max, sum, mag, marker, n, sz;
57  uint8_t *ptr;
58  int res;
59 
60  stats(in, n_in, &max, &sum);
61  mag = av_log2(max) >> 3;
62  marker = 0xC0 + (mag << 3) + (n_in - 1);
63  sz = sum + 2 + (mag + 1) * n_in;
64  res = av_new_packet(out, sz);
65  if (res < 0)
66  return res;
67  ptr = out->data;
68  for (n = 0; n < n_in; n++) {
69  memcpy(ptr, in[n].data, in[n].size);
70  ptr += in[n].size;
71  }
72 
73 #define wloop(mag, wr) \
74  for (n = 0; n < n_in; n++) { \
75  wr; \
76  ptr += mag + 1; \
77  }
78 
79  // write superframe with marker 110[mag:2][nframes:3]
80  *ptr++ = marker;
81  switch (mag) {
82  case 0:
83  wloop(mag, *ptr = in[n].size);
84  break;
85  case 1:
86  wloop(mag, AV_WL16(ptr, in[n].size));
87  break;
88  case 2:
89  wloop(mag, AV_WL24(ptr, in[n].size));
90  break;
91  case 3:
92  wloop(mag, AV_WL32(ptr, in[n].size));
93  break;
94  }
95  *ptr++ = marker;
96  av_assert0(ptr == &out->data[out->size]);
97 
98  return 0;
99 }
100 
102 {
103  GetBitContext gb;
104  VP9BSFContext *s = ctx->priv_data;
105  AVPacket *in;
106  int res, invisible, profile, marker, uses_superframe_syntax = 0, n;
107 
108  res = ff_bsf_get_packet(ctx, &in);
109  if (res < 0)
110  return res;
111 
112  marker = in->data[in->size - 1];
113  if ((marker & 0xe0) == 0xc0) {
114  int nbytes = 1 + ((marker >> 3) & 0x3);
115  int n_frames = 1 + (marker & 0x7), idx_sz = 2 + n_frames * nbytes;
116 
117  uses_superframe_syntax = in->size >= idx_sz && in->data[in->size - idx_sz] == marker;
118  }
119 
120  if ((res = init_get_bits8(&gb, in->data, in->size)) < 0)
121  goto done;
122 
123  get_bits(&gb, 2); // frame marker
124  profile = get_bits1(&gb);
125  profile |= get_bits1(&gb) << 1;
126  if (profile == 3) profile += get_bits1(&gb);
127 
128  if (get_bits1(&gb)) {
129  invisible = 0;
130  } else {
131  get_bits1(&gb); // keyframe
132  invisible = !get_bits1(&gb);
133  }
134 
135  if (uses_superframe_syntax && s->n_cache > 0) {
136  av_log(ctx, AV_LOG_ERROR,
137  "Mixing of superframe syntax and naked VP9 frames not supported");
138  res = AVERROR_INVALIDDATA;
139  goto done;
140  } else if ((!invisible || uses_superframe_syntax) && !s->n_cache) {
141  // passthrough
142  av_packet_move_ref(out, in);
143  goto done;
144  } else if (s->n_cache + 1 >= MAX_CACHE) {
145  av_log(ctx, AV_LOG_ERROR,
146  "Too many invisible frames");
147  res = AVERROR_INVALIDDATA;
148  goto done;
149  }
150 
151  s->cache[s->n_cache].size = in->size;
152  if (invisible && !uses_superframe_syntax) {
153  s->cache[s->n_cache].data = av_malloc(in->size);
154  if (!s->cache[s->n_cache].data) {
155  res = AVERROR(ENOMEM);
156  goto done;
157  }
158  memcpy(s->cache[s->n_cache++].data, in->data, in->size);
159  res = AVERROR(EAGAIN);
160  goto done;
161  }
162  av_assert0(s->n_cache > 0);
163 
164  s->cache[s->n_cache].data = in->data;
165 
166  // build superframe
167  if ((res = merge_superframe(s->cache, s->n_cache + 1, out)) < 0)
168  goto done;
169 
170  for (n = 0; n < s->n_cache; n++)
171  av_freep(&s->cache[n].data);
172  s->n_cache = 0;
173 
174  res = av_packet_copy_props(out, in);
175  if (res < 0)
176  goto done;
177 
178 done:
179  if (res < 0)
180  av_packet_unref(out);
181  av_packet_free(&in);
182  return res;
183 }
184 
186 {
187  VP9BSFContext *s = ctx->priv_data;
188  int n;
189 
190  // free cached data
191  for (n = 0; n < s->n_cache; n++)
192  av_freep(&s->cache[n].data);
193 }
194 
195 static const enum AVCodecID codec_ids[] = {
197 };
198 
200  .name = "vp9_superframe",
201  .priv_data_size = sizeof(VP9BSFContext),
203  .close = vp9_superframe_close,
204  .codec_ids = codec_ids,
205 };
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
The bitstream filter state.
Definition: avcodec.h:5914
int size
Definition: avcodec.h:1680
int av_log2(unsigned v)
Definition: intmath.c:26
static int vp9_superframe_filter(AVBSFContext *ctx, AVPacket *out)
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5935
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define AV_WL24(p, d)
Definition: intreadwrite.h:469
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:62
uint8_t
#define av_malloc(s)
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, uint8_t clip)
Definition: cfhd.c:80
const char * name
Definition: avcodec.h:5964
uint8_t * data
Definition: avcodec.h:1679
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:673
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_log(a,...)
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:214
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define MAX_CACHE
simple assert() macros that are a bit more flexible than ISO C assert().
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
Definition: avpacket.c:586
AVFormatContext * ctx
Definition: movenc.c:48
const AVBitStreamFilter ff_vp9_superframe_bsf
int n
Definition: avisynth_c.h:684
#define wloop(mag, wr)
Libavcodec external API header.
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:456
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:618
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
mfxU16 profile
Definition: qsvenc.c:44
struct VP9BSFContext::CachedBuf cache[MAX_CACHE]
static void vp9_superframe_close(AVBSFContext *ctx)
int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
Called by the bitstream filters to get the next packet for filtering.
Definition: bsf.c:201
#define AV_WL16(p, v)
Definition: intreadwrite.h:417
static int merge_superframe(const struct CachedBuf *in, int n_in, AVPacket *out)
static void stats(const struct CachedBuf *in, int n_in, unsigned *_max, unsigned *_sum)
static enum AVCodecID codec_ids[]
FILE * out
Definition: movenc.c:54
#define av_freep(p)
This structure stores compressed data.
Definition: avcodec.h:1656
#define AV_WL32(p, v)
Definition: intreadwrite.h:431