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00022 #include "avcodec.h"
00023 #include "bytestream.h"
00024 #include "put_bits.h"
00025 #include "pnm.h"
00026
00027
00028 static int pnm_decode_frame(AVCodecContext *avctx, void *data,
00029 int *data_size, AVPacket *avpkt)
00030 {
00031 const uint8_t *buf = avpkt->data;
00032 int buf_size = avpkt->size;
00033 PNMContext * const s = avctx->priv_data;
00034 AVFrame *picture = data;
00035 AVFrame * const p = (AVFrame*)&s->picture;
00036 int i, j, n, linesize, h, upgrade = 0;
00037 unsigned char *ptr;
00038 int components, sample_len;
00039
00040 s->bytestream_start =
00041 s->bytestream = buf;
00042 s->bytestream_end = buf + buf_size;
00043
00044 if (ff_pnm_decode_header(avctx, s) < 0)
00045 return -1;
00046
00047 if (p->data[0])
00048 avctx->release_buffer(avctx, p);
00049
00050 p->reference = 0;
00051 if (avctx->get_buffer(avctx, p) < 0) {
00052 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00053 return -1;
00054 }
00055 p->pict_type = FF_I_TYPE;
00056 p->key_frame = 1;
00057
00058 switch (avctx->pix_fmt) {
00059 default:
00060 return -1;
00061 case PIX_FMT_RGB48BE:
00062 n = avctx->width * 6;
00063 components=3;
00064 sample_len=16;
00065 goto do_read;
00066 case PIX_FMT_RGB24:
00067 n = avctx->width * 3;
00068 components=3;
00069 sample_len=8;
00070 goto do_read;
00071 case PIX_FMT_GRAY8:
00072 n = avctx->width;
00073 components=1;
00074 sample_len=8;
00075 if (s->maxval < 255)
00076 upgrade = 1;
00077 goto do_read;
00078 case PIX_FMT_GRAY16BE:
00079 case PIX_FMT_GRAY16LE:
00080 n = avctx->width * 2;
00081 components=1;
00082 sample_len=16;
00083 if (s->maxval < 65535)
00084 upgrade = 2;
00085 goto do_read;
00086 case PIX_FMT_MONOWHITE:
00087 case PIX_FMT_MONOBLACK:
00088 n = (avctx->width + 7) >> 3;
00089 components=1;
00090 sample_len=1;
00091 do_read:
00092 ptr = p->data[0];
00093 linesize = p->linesize[0];
00094 if (s->bytestream + n * avctx->height > s->bytestream_end)
00095 return -1;
00096 if(s->type < 4){
00097 for (i=0; i<avctx->height; i++) {
00098 PutBitContext pb;
00099 init_put_bits(&pb, ptr, linesize);
00100 for(j=0; j<avctx->width * components; j++){
00101 unsigned int c=0;
00102 int v=0;
00103 while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
00104 s->bytestream++;
00105 if(s->bytestream >= s->bytestream_end)
00106 return -1;
00107 do{
00108 v= 10*v + c;
00109 c= (*s->bytestream++) - '0';
00110 }while(c <= 9);
00111 put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
00112 }
00113 flush_put_bits(&pb);
00114 ptr+= linesize;
00115 }
00116 }else{
00117 for (i = 0; i < avctx->height; i++) {
00118 if (!upgrade)
00119 memcpy(ptr, s->bytestream, n);
00120 else if (upgrade == 1) {
00121 unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
00122 for (j = 0; j < n; j++)
00123 ptr[j] = (s->bytestream[j] * f + 64) >> 7;
00124 } else if (upgrade == 2) {
00125 unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
00126 for (j = 0; j < n / 2; j++) {
00127 v = be2me_16(((uint16_t *)s->bytestream)[j]);
00128 ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
00129 }
00130 }
00131 s->bytestream += n;
00132 ptr += linesize;
00133 }
00134 }
00135 break;
00136 case PIX_FMT_YUV420P:
00137 {
00138 unsigned char *ptr1, *ptr2;
00139
00140 n = avctx->width;
00141 ptr = p->data[0];
00142 linesize = p->linesize[0];
00143 if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
00144 return -1;
00145 for (i = 0; i < avctx->height; i++) {
00146 memcpy(ptr, s->bytestream, n);
00147 s->bytestream += n;
00148 ptr += linesize;
00149 }
00150 ptr1 = p->data[1];
00151 ptr2 = p->data[2];
00152 n >>= 1;
00153 h = avctx->height >> 1;
00154 for (i = 0; i < h; i++) {
00155 memcpy(ptr1, s->bytestream, n);
00156 s->bytestream += n;
00157 memcpy(ptr2, s->bytestream, n);
00158 s->bytestream += n;
00159 ptr1 += p->linesize[1];
00160 ptr2 += p->linesize[2];
00161 }
00162 }
00163 break;
00164 case PIX_FMT_RGB32:
00165 ptr = p->data[0];
00166 linesize = p->linesize[0];
00167 if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end)
00168 return -1;
00169 for (i = 0; i < avctx->height; i++) {
00170 int j, r, g, b, a;
00171
00172 for (j = 0; j < avctx->width; j++) {
00173 r = *s->bytestream++;
00174 g = *s->bytestream++;
00175 b = *s->bytestream++;
00176 a = *s->bytestream++;
00177 ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
00178 }
00179 ptr += linesize;
00180 }
00181 break;
00182 }
00183 *picture = *(AVFrame*)&s->picture;
00184 *data_size = sizeof(AVPicture);
00185
00186 return s->bytestream - s->bytestream_start;
00187 }
00188
00189
00190 #if CONFIG_PGM_DECODER
00191 AVCodec pgm_decoder = {
00192 "pgm",
00193 AVMEDIA_TYPE_VIDEO,
00194 CODEC_ID_PGM,
00195 sizeof(PNMContext),
00196 ff_pnm_init,
00197 NULL,
00198 ff_pnm_end,
00199 pnm_decode_frame,
00200 CODEC_CAP_DR1,
00201 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
00202 .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
00203 };
00204 #endif
00205
00206 #if CONFIG_PGMYUV_DECODER
00207 AVCodec pgmyuv_decoder = {
00208 "pgmyuv",
00209 AVMEDIA_TYPE_VIDEO,
00210 CODEC_ID_PGMYUV,
00211 sizeof(PNMContext),
00212 ff_pnm_init,
00213 NULL,
00214 ff_pnm_end,
00215 pnm_decode_frame,
00216 CODEC_CAP_DR1,
00217 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00218 .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
00219 };
00220 #endif
00221
00222 #if CONFIG_PPM_DECODER
00223 AVCodec ppm_decoder = {
00224 "ppm",
00225 AVMEDIA_TYPE_VIDEO,
00226 CODEC_ID_PPM,
00227 sizeof(PNMContext),
00228 ff_pnm_init,
00229 NULL,
00230 ff_pnm_end,
00231 pnm_decode_frame,
00232 CODEC_CAP_DR1,
00233 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
00234 .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
00235 };
00236 #endif
00237
00238 #if CONFIG_PBM_DECODER
00239 AVCodec pbm_decoder = {
00240 "pbm",
00241 AVMEDIA_TYPE_VIDEO,
00242 CODEC_ID_PBM,
00243 sizeof(PNMContext),
00244 ff_pnm_init,
00245 NULL,
00246 ff_pnm_end,
00247 pnm_decode_frame,
00248 CODEC_CAP_DR1,
00249 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
00250 .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
00251 };
00252 #endif
00253
00254 #if CONFIG_PAM_DECODER
00255 AVCodec pam_decoder = {
00256 "pam",
00257 AVMEDIA_TYPE_VIDEO,
00258 CODEC_ID_PAM,
00259 sizeof(PNMContext),
00260 ff_pnm_init,
00261 NULL,
00262 ff_pnm_end,
00263 pnm_decode_frame,
00264 CODEC_CAP_DR1,
00265 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
00266 .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
00267 };
00268 #endif