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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;
32 
33 static void stats(AVPacket * const *in, int n_in,
34  unsigned *_max, unsigned *_sum)
35 {
36  int n;
37  unsigned max = 0, sum = 0;
38 
39  for (n = 0; n < n_in; n++) {
40  unsigned sz = in[n]->size;
41 
42  if (sz > max)
43  max = sz;
44  sum += sz;
45  }
46 
47  *_max = max;
48  *_sum = sum;
49 }
50 
51 static int merge_superframe(AVPacket * const *in, int n_in, AVPacket *out)
52 {
53  unsigned max, sum, mag, marker, n, sz;
54  uint8_t *ptr;
55  int res;
56 
57  stats(in, n_in, &max, &sum);
58  mag = av_log2(max) >> 3;
59  marker = 0xC0 + (mag << 3) + (n_in - 1);
60  sz = sum + 2 + (mag + 1) * n_in;
61  res = av_new_packet(out, sz);
62  if (res < 0)
63  return res;
64  ptr = out->data;
65  for (n = 0; n < n_in; n++) {
66  memcpy(ptr, in[n]->data, in[n]->size);
67  ptr += in[n]->size;
68  }
69 
70 #define wloop(mag, wr) \
71  do { \
72  for (n = 0; n < n_in; n++) { \
73  wr; \
74  ptr += mag + 1; \
75  } \
76  } while (0)
77 
78  // write superframe with marker 110[mag:2][nframes:3]
79  *ptr++ = marker;
80  switch (mag) {
81  case 0:
82  wloop(mag, *ptr = in[n]->size);
83  break;
84  case 1:
85  wloop(mag, AV_WL16(ptr, in[n]->size));
86  break;
87  case 2:
88  wloop(mag, AV_WL24(ptr, in[n]->size));
89  break;
90  case 3:
91  wloop(mag, AV_WL32(ptr, in[n]->size));
92  break;
93  }
94  *ptr++ = marker;
95  av_assert0(ptr == &out->data[out->size]);
96 
97  return 0;
98 }
99 
101 {
102  GetBitContext gb;
103  VP9BSFContext *s = ctx->priv_data;
104  AVPacket *in;
105  int res, invisible, profile, marker, uses_superframe_syntax = 0, n;
106 
107  res = ff_bsf_get_packet(ctx, &in);
108  if (res < 0)
109  return res;
110 
111  marker = in->data[in->size - 1];
112  if ((marker & 0xe0) == 0xc0) {
113  int nbytes = 1 + ((marker >> 3) & 0x3);
114  int n_frames = 1 + (marker & 0x7), idx_sz = 2 + n_frames * nbytes;
115 
116  uses_superframe_syntax = in->size >= idx_sz && in->data[in->size - idx_sz] == marker;
117  }
118 
119  if ((res = init_get_bits8(&gb, in->data, in->size)) < 0)
120  goto done;
121 
122  get_bits(&gb, 2); // frame marker
123  profile = get_bits1(&gb);
124  profile |= get_bits1(&gb) << 1;
125  if (profile == 3) profile += get_bits1(&gb);
126 
127  if (get_bits1(&gb)) {
128  invisible = 0;
129  } else {
130  get_bits1(&gb); // keyframe
131  invisible = !get_bits1(&gb);
132  }
133 
134  if (uses_superframe_syntax && s->n_cache > 0) {
135  av_log(ctx, AV_LOG_ERROR,
136  "Mixing of superframe syntax and naked VP9 frames not supported");
137  res = AVERROR(ENOSYS);
138  goto done;
139  } else if ((!invisible || uses_superframe_syntax) && !s->n_cache) {
140  // passthrough
141  av_packet_move_ref(out, in);
142  goto done;
143  } else if (s->n_cache + 1 >= MAX_CACHE) {
144  av_log(ctx, AV_LOG_ERROR,
145  "Too many invisible frames");
146  res = AVERROR_INVALIDDATA;
147  goto done;
148  }
149 
150  av_packet_move_ref(s->cache[s->n_cache++], in);
151 
152  if (invisible) {
153  res = AVERROR(EAGAIN);
154  goto done;
155  }
156  av_assert0(s->n_cache > 0);
157 
158  // build superframe
159  if ((res = merge_superframe(s->cache, s->n_cache, out)) < 0)
160  goto done;
161 
162  res = av_packet_copy_props(out, s->cache[s->n_cache - 1]);
163  if (res < 0)
164  goto done;
165 
166  for (n = 0; n < s->n_cache; n++)
167  av_packet_unref(s->cache[n]);
168  s->n_cache = 0;
169 
170 done:
171  if (res < 0)
172  av_packet_unref(out);
173  av_packet_free(&in);
174  return res;
175 }
176 
178 {
179  VP9BSFContext *s = ctx->priv_data;
180  int n;
181 
182  // alloc cache packets
183  for (n = 0; n < MAX_CACHE; n++) {
184  s->cache[n] = av_packet_alloc();
185  if (!s->cache[n])
186  return AVERROR(ENOMEM);
187  }
188 
189  return 0;
190 }
191 
193 {
194  VP9BSFContext *s = ctx->priv_data;
195  int n;
196 
197  // unref cached data
198  for (n = 0; n < s->n_cache; n++)
199  av_packet_unref(s->cache[n]);
200  s->n_cache = 0;
201 }
202 
204 {
205  VP9BSFContext *s = ctx->priv_data;
206  int n;
207 
208  // free cached data
209  for (n = 0; n < MAX_CACHE; n++)
210  av_packet_free(&s->cache[n]);
211 }
212 
213 static const enum AVCodecID codec_ids[] = {
215 };
216 
218  .name = "vp9_superframe",
219  .priv_data_size = sizeof(VP9BSFContext),
223  .close = vp9_superframe_close,
224  .codec_ids = codec_ids,
225 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVPacket * cache[MAX_CACHE]
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:381
static void vp9_superframe_flush(AVBSFContext *ctx)
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
The bitstream filter state.
Definition: avcodec.h:5703
int size
Definition: avcodec.h:1446
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:5724
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define AV_WL24(p, d)
Definition: intreadwrite.h:464
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:153
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
const char * name
Definition: avcodec.h:5753
uint8_t * data
Definition: avcodec.h:1445
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:653
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:215
#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:564
AVFormatContext * ctx
Definition: movenc.c:48
const AVBitStreamFilter ff_vp9_superframe_bsf
static void stats(AVPacket *const *in, int n_in, unsigned *_max, unsigned *_sum)
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:684
static int merge_superframe(AVPacket *const *in, int n_in, AVPacket *out)
#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:650
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:598
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:487
mfxU16 profile
Definition: qsvenc.c:44
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:216
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
static int vp9_superframe_init(AVBSFContext *ctx)
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:51
static enum AVCodecID codec_ids[]
FILE * out
Definition: movenc.c:54
This structure stores compressed data.
Definition: avcodec.h:1422
#define AV_WL32(p, v)
Definition: intreadwrite.h:426