Libav
h264_mp4toannexb_bsf.c
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1 /*
2  * H.264 MP4 to Annex B byte stream format filter
3  * Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <string.h>
23 
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/mem.h"
26 
27 #include "avcodec.h"
28 #include "bsf.h"
29 
30 typedef struct H264BSFContext {
35 
37  const uint8_t *sps_pps, uint32_t sps_pps_size,
38  const uint8_t *in, uint32_t in_size)
39 {
40  uint32_t offset = out->size;
41  uint8_t nal_header_size = offset ? 3 : 4;
42  int err;
43 
44  err = av_grow_packet(out, sps_pps_size + in_size + nal_header_size);
45  if (err < 0)
46  return err;
47 
48  if (sps_pps)
49  memcpy(out->data + offset, sps_pps, sps_pps_size);
50  memcpy(out->data + sps_pps_size + nal_header_size + offset, in, in_size);
51  if (!offset) {
52  AV_WB32(out->data + sps_pps_size, 1);
53  } else {
54  (out->data + offset + sps_pps_size)[0] =
55  (out->data + offset + sps_pps_size)[1] = 0;
56  (out->data + offset + sps_pps_size)[2] = 1;
57  }
58 
59  return 0;
60 }
61 
62 static int h264_extradata_to_annexb(AVBSFContext *ctx, const int padding)
63 {
64  uint16_t unit_size;
65  uint64_t total_size = 0;
66  uint8_t *out = NULL, unit_nb, sps_done = 0,
67  sps_seen = 0, pps_seen = 0;
68  const uint8_t *extradata = ctx->par_in->extradata + 4;
69  static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
70  int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size
71 
72  if (length_size == 3)
73  return AVERROR(EINVAL);
74 
75  /* retrieve sps and pps unit(s) */
76  unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
77  if (!unit_nb) {
78  unit_nb = *extradata++; /* number of pps unit(s) */
79  sps_done++;
80 
81  if (unit_nb)
82  pps_seen = 1;
83  } else {
84  sps_seen = 1;
85  }
86 
87  while (unit_nb--) {
88  int err;
89 
90  unit_size = AV_RB16(extradata);
91  total_size += unit_size + 4;
92  if (total_size > INT_MAX - padding ||
93  extradata + 2 + unit_size > ctx->par_in->extradata +
94  ctx->par_in->extradata_size) {
95  av_free(out);
96  return AVERROR(EINVAL);
97  }
98  if ((err = av_reallocp(&out, total_size + padding)) < 0)
99  return err;
100  memcpy(out + total_size - unit_size - 4, nalu_header, 4);
101  memcpy(out + total_size - unit_size, extradata + 2, unit_size);
102  extradata += 2 + unit_size;
103 
104  if (!unit_nb && !sps_done++) {
105  unit_nb = *extradata++; /* number of pps unit(s) */
106  if (unit_nb)
107  pps_seen = 1;
108  }
109  }
110 
111  if (out)
112  memset(out + total_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
113 
114  if (!sps_seen)
115  av_log(ctx, AV_LOG_WARNING,
116  "Warning: SPS NALU missing or invalid. "
117  "The resulting stream may not play.\n");
118 
119  if (!pps_seen)
120  av_log(ctx, AV_LOG_WARNING,
121  "Warning: PPS NALU missing or invalid. "
122  "The resulting stream may not play.\n");
123 
124  av_freep(&ctx->par_out->extradata);
125  ctx->par_out->extradata = out;
126  ctx->par_out->extradata_size = total_size;
127 
128  return length_size;
129 }
130 
132 {
133  H264BSFContext *s = ctx->priv_data;
134  int extra_size = ctx->par_in->extradata_size;
135  int ret;
136 
137  /* retrieve sps and pps NAL units from extradata */
138  if (!extra_size ||
139  (extra_size >= 3 && AV_RB24(ctx->par_in->extradata) == 1) ||
140  (extra_size >= 4 && AV_RB32(ctx->par_in->extradata) == 1)) {
141  av_log(ctx, AV_LOG_VERBOSE,
142  "The input looks like it is Annex B already\n");
143  } else if (extra_size >= 6) {
145  if (ret < 0)
146  return ret;
147 
148  s->length_size = ret;
149  s->first_idr = 1;
150  s->extradata_parsed = 1;
151  } else {
152  av_log(ctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extra_size);
153  return AVERROR_INVALIDDATA;
154  }
155 
156  return 0;
157 }
158 
160 {
161  H264BSFContext *s = ctx->priv_data;
162 
163  AVPacket *in;
164  uint8_t unit_type;
165  int32_t nal_size;
166  uint32_t cumul_size = 0;
167  const uint8_t *buf;
168  const uint8_t *buf_end;
169  int buf_size;
170  int ret = 0;
171 
172  ret = ff_bsf_get_packet(ctx, &in);
173  if (ret < 0)
174  return ret;
175 
176  /* nothing to filter */
177  if (!s->extradata_parsed) {
178  av_packet_move_ref(out, in);
179  av_packet_free(&in);
180  return 0;
181  }
182 
183  buf = in->data;
184  buf_size = in->size;
185  buf_end = in->data + in->size;
186 
187  do {
188  if (buf + s->length_size > buf_end)
189  goto fail;
190 
191  if (s->length_size == 1) {
192  nal_size = buf[0];
193  } else if (s->length_size == 2) {
194  nal_size = AV_RB16(buf);
195  } else
196  nal_size = AV_RB32(buf);
197 
198  buf += s->length_size;
199  unit_type = *buf & 0x1f;
200 
201  if (buf + nal_size > buf_end || nal_size < 0)
202  goto fail;
203 
204  /* prepend only to the first type 5 NAL unit of an IDR picture */
205  if (s->first_idr && unit_type == 5) {
206  if (alloc_and_copy(out,
208  buf, nal_size) < 0)
209  goto fail;
210  s->first_idr = 0;
211  } else {
212  if (alloc_and_copy(out,
213  NULL, 0, buf, nal_size) < 0)
214  goto fail;
215  if (!s->first_idr && unit_type == 1)
216  s->first_idr = 1;
217  }
218 
219  buf += nal_size;
220  cumul_size += nal_size + s->length_size;
221  } while (cumul_size < buf_size);
222 
223  ret = av_packet_copy_props(out, in);
224  if (ret < 0)
225  goto fail;
226 
227 fail:
228  if (ret < 0)
229  av_packet_unref(out);
230  av_packet_free(&in);
231 
232  return ret;
233 }
234 
235 static const enum AVCodecID codec_ids[] = {
237 };
238 
240  .name = "h264_mp4toannexb",
241  .priv_data_size = sizeof(H264BSFContext),
244  .codec_ids = codec_ids,
245 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
AVCodecParameters * par_out
Parameters of the output stream.
Definition: avcodec.h:5021
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:130
memory handling functions
The bitstream filter state.
Definition: avcodec.h:4990
int size
Definition: avcodec.h:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
#define AV_RB24
Definition: intreadwrite.h:64
static int h264_mp4toannexb_init(AVBSFContext *ctx)
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5011
#define AV_WB32(p, val)
Definition: intreadwrite.h:246
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:202
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:60
uint8_t
#define AV_RB32
Definition: intreadwrite.h:130
const char * name
Definition: avcodec.h:5037
uint8_t * data
Definition: avcodec.h:1346
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:140
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:401
static int h264_extradata_to_annexb(AVBSFContext *ctx, const int padding)
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:140
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:193
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:190
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
#define fail()
Definition: checkasm.h:80
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3501
static void filter(MpegAudioContext *s, int ch, const short *samples, int incr)
Definition: mpegaudioenc.c:307
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
Definition: avpacket.c:315
int32_t
AVFormatContext * ctx
Definition: movenc.c:48
static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
NULL
Definition: eval.c:55
Libavcodec external API header.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:347
static int alloc_and_copy(AVPacket *out, const uint8_t *sps_pps, uint32_t sps_pps_size, const uint8_t *in, uint32_t in_size)
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;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);return NULL;} return ac;} 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;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->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);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
static enum AVCodecID codec_ids[]
int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
Called by the bitstream filters to get the next packet for filtering.
Definition: bsf.c:199
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:107
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:638
const AVBitStreamFilter ff_h264_mp4toannexb_bsf
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3497
FILE * out
Definition: movenc.c:54
This structure stores compressed data.
Definition: avcodec.h:1323
AVCodecParameters * par_in
Parameters of the input stream.
Definition: avcodec.h:5016