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33 for (
i=0;
i<
n/2;
i++) {
43 int buf_size = avpkt->
size;
46 int i, j, k,
n, linesize,
h, upgrade = 0, is_mono = 0;
48 int components, sample_len,
ret;
70 if (
s->maxval < 65535)
77 if (
s->maxval < 65535)
108 if (
s->maxval < 65535)
115 if (
s->maxval < 65535)
120 n = (avctx->
width + 7) >> 3;
127 if (
n * avctx->
height >
s->bytestream_end -
s->bytestream)
129 if(
s->type < 4 || (is_mono &&
s->type==7)){
133 for(j=0; j<avctx->
width * components; j++){
137 while(
s->bytestream <
s->bytestream_end && (*
s->bytestream <
'0' || *
s->bytestream >
'9' ))
139 if(
s->bytestream >=
s->bytestream_end)
143 v = (*
s->bytestream++)&1;
146 for (k = 0; k < 5 &&
c <= 9; k += 1) {
148 c = (*
s->bytestream++) -
'0';
155 if (sample_len == 16) {
156 ((uint16_t*)ptr)[j] = (((1<<sample_len)-1)*v + (
s->maxval>>1))/
s->maxval;
158 put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (
s->maxval>>1))/
s->maxval);
160 if (sample_len != 16)
168 else if (upgrade == 1) {
169 unsigned int j,
f = (255 * 128 +
s->maxval / 2) /
s->maxval;
170 for (j = 0; j <
n; j++)
171 ptr[j] = (
s->bytestream[j] *
f + 64) >> 7;
172 }
else if (upgrade == 2) {
173 unsigned int j, v,
f = (65535 * 32768 +
s->maxval / 2) /
s->maxval;
174 for (j = 0; j <
n / 2; j++) {
176 ((uint16_t *)ptr)[j] = (v *
f + 16384) >> 15;
188 unsigned char *ptr1, *ptr2;
193 if (
s->maxval >= 256)
195 if (
n * avctx->
height * 3 / 2 >
s->bytestream_end -
s->bytestream)
206 for (
i = 0;
i <
h;
i++) {
218 uint16_t *ptr1, *ptr2;
219 const int f = (65535 * 32768 +
s->maxval / 2) /
s->maxval;
225 if (
n * avctx->
height * 3 / 2 >
s->bytestream_end -
s->bytestream)
228 for (j = 0; j <
n / 2; j++) {
230 ((uint16_t *)ptr)[j] = (v *
f + 16384) >> 15;
235 ptr1 = (uint16_t*)p->
data[1];
236 ptr2 = (uint16_t*)p->
data[2];
239 for (
i = 0;
i <
h;
i++) {
240 for (j = 0; j <
n / 2; j++) {
242 ptr1[j] = (v *
f + 16384) >> 15;
246 for (j = 0; j <
n / 2; j++) {
248 ptr2[j] = (v *
f + 16384) >> 15;
260 return s->bytestream -
s->bytestream_start;
264 #if CONFIG_PGM_DECODER
276 #if CONFIG_PGMYUV_DECODER
288 #if CONFIG_PPM_DECODER
300 #if CONFIG_PBM_DECODER
312 #if CONFIG_PAM_DECODER
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
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
This structure describes decoded (raw) audio or video data.
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
@ AV_PIX_FMT_MONOWHITE
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb.
#define AV_PIX_FMT_YUV420P10
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int key_frame
1 -> keyframe, 0-> not
#define AV_PIX_FMT_GRAY16
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
#define AV_PIX_FMT_YUV420P9
#define AV_PIX_FMT_YUV420P16
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
@ AV_PIX_FMT_GRAY8A
alias for AV_PIX_FMT_YA8
#define AV_PIX_FMT_RGBA64
@ AV_PIX_FMT_MONOBLACK
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb.
@ AV_PICTURE_TYPE_I
Intra.
static void samplecpy(uint8_t *dst, const uint8_t *src, int n, int maxval)
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
enum AVPictureType pict_type
Picture type of the frame.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
AVCodec ff_pgmyuv_decoder
#define i(width, name, range_min, range_max)
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
main external API structure.
int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext *const s)
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
This structure stores compressed data.
int width
picture width / height.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static int pnm_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
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