32 const uint8_t *
a = p + 4 - ((intptr_t)p & 3);
34 for (end -= 3; p < a && p <
end; p++) {
35 if (p[0] == 0 && p[1] == 0 && p[2] == 1)
39 for (end -= 3; p <
end; p += 4) {
40 uint32_t x = *(
const uint32_t*)p;
43 if ((x - 0x01010101) & (~x) & 0x80808080) {
45 if (p[0] == 0 && p[2] == 1)
47 if (p[2] == 0 && p[3] == 1)
51 if (p[2] == 0 && p[4] == 1)
53 if (p[4] == 0 && p[5] == 1)
59 for (end += 3; p <
end; p++) {
60 if (p[0] == 0 && p[1] == 0 && p[2] == 1)
69 if(p<out && out<end && !out[-1]) out--;
77 const uint8_t *nal_start, *nal_end;
82 while (nal_start < end && !*(nal_start++));
88 avio_write(pb, nal_start, nal_end - nal_start);
89 size += 4 + nal_end - nal_start;
114 uint32_t sps_size = 0, pps_size = 0, sps_ext_size = 0;
115 int ret, nb_sps = 0, nb_pps = 0, nb_sps_ext = 0;
121 if (
AV_RB32(data) != 0x00000001 &&
144 while (end - buf > 4) {
149 nal_type = buf[0] & 0x1f;
159 }
else if (nal_type == 8) {
167 }
else if (nal_type == 13) {
169 if (size > UINT16_MAX || nb_sps_ext >= 256) {
183 if (sps_size < 6 || !pps_size) {
199 if (sps[3] != 66 && sps[3] != 77 && sps[3] != 88) {
225 uint16_t sps_size, pps_size;
230 if (*size >= 4 && (
AV_RB32(in) == 0x00000001 ||
AV_RB24(in) == 0x000001))
232 if (*size < 11 || in[0] != 1)
236 if (11 + sps_size > *size)
238 pps_size =
AV_RB16(&in[9 + sps_size]);
239 if (11 + sps_size + pps_size > *size)
241 out_size = 8 + sps_size + pps_size;
246 memcpy(out + 4, &in[8], sps_size);
247 AV_WB32(&out[4 + sps_size], 0x00000001);
248 memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size);
258 unsigned int res = 0;
260 if (end - start < nal_length_size)
262 while (nal_length_size--)
263 res = (res << 8) | *start++;
265 if (res > end - start)
272 uint32_t *dst_len,
int header_len)
283 while (i < header_len && i < src_len)
284 dst[len++] = src[i++];
286 while (i + 2 < src_len)
287 if (!src[i] && !src[i + 1] && src[i + 2] == 3) {
288 dst[len++] = src[i++];
289 dst[len++] = src[i++];
292 dst[len++] = src[i++];
295 dst[len++] = src[i++];
325 for (i = 0; i < 32 && !
get_bits1(gb); i++)
333 return ((v >> 1) ^ sign) - sign;
338 int i, j,
ret, rbsp_size, aspect_ratio_idc, pic_order_cnt_type;
339 int num_ref_frames_in_pic_order_cnt_cycle;
340 int delta_scale, lastScale = 8, nextScale = 8;
341 int sizeOfScalingList;
387 sizeOfScalingList = i < 6 ? 16 : 64;
388 for (j = 0; j < sizeOfScalingList; j++) {
389 if (nextScale != 0) {
391 nextScale = (lastScale + delta_scale) & 0xff;
393 lastScale = nextScale == 0 ? lastScale : nextScale;
406 if (pic_order_cnt_type == 0) {
408 }
else if (pic_order_cnt_type == 1) {
413 for (i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++)
437 aspect_ratio_idc =
get_bits(&gb, 8);
438 if (aspect_ratio_idc == 0xff) {
441 }
else if (aspect_ratio_idc <
FF_ARRAY_ELEMS(avc_sample_aspect_ratio)) {
442 sps->
sar = avc_sample_aspect_ratio[aspect_ratio_idc];
uint8_t chroma_format_idc
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static int get_se_golomb(GetBitContext *gb)
const uint8_t * ff_avc_find_startcode(const uint8_t *p, const uint8_t *end)
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
ptrdiff_t const GLvoid * data
static int get_ue_golomb(GetBitContext *gb)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
static const AVRational avc_sample_aspect_ratio[17]
static av_cold int end(AVCodecContext *avctx)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
bitstream reader API header.
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
H.264 common definitions.
#define i(width, name, range_min, range_max)
int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
uint8_t frame_mbs_only_flag
static const uint8_t * ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
uint8_t constraint_set_flags
uint8_t * ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len, uint32_t *dst_len, int header_len)
#define FF_ARRAY_ELEMS(a)
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
void avio_w8(AVIOContext *s, int b)
static unsigned int get_bits1(GetBitContext *s)
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)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
static void skip_bits1(GetBitContext *s)
static void skip_bits(GetBitContext *s, int n)
static int FUNC() pps(CodedBitstreamContext *ctx, RWContext *rw, H264RawPPS *current)
Rational number (pair of numerator and denominator).
const uint8_t * ff_avc_mp4_find_startcode(const uint8_t *start, const uint8_t *end, int nal_length_size)
static int FUNC() sps(CodedBitstreamContext *ctx, RWContext *rw, H264RawSPS *current)
void avio_wb16(AVIOContext *s, unsigned int val)
H264SequenceParameterSet * ff_avc_decode_sps(const uint8_t *buf, int buf_size)
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
void avio_wb32(AVIOContext *s, unsigned int val)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.