3 * Copyright (c) 2002, 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
27 static int pnm_decode_frame(AVCodecContext *avctx, void *data,
28 int *data_size, AVPacket *avpkt)
30 const uint8_t *buf = avpkt->data;
31 int buf_size = avpkt->size;
32 PNMContext * const s = avctx->priv_data;
33 AVFrame *picture = data;
34 AVFrame * const p = (AVFrame*)&s->picture;
35 int i, j, n, linesize, h, upgrade = 0, is_mono = 0;
37 int components, sample_len;
41 s->bytestream_end = buf + buf_size;
43 if (ff_pnm_decode_header(avctx, s) < 0)
47 avctx->release_buffer(avctx, p);
50 if (avctx->get_buffer(avctx, p) < 0) {
51 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
54 p->pict_type = AV_PICTURE_TYPE_I;
57 switch (avctx->pix_fmt) {
60 case PIX_FMT_RGBA64BE:
92 case PIX_FMT_GRAY16BE:
93 case PIX_FMT_GRAY16LE:
97 if (s->maxval < 65535)
100 case PIX_FMT_MONOWHITE:
101 case PIX_FMT_MONOBLACK:
102 n = (avctx->width + 7) >> 3;
108 linesize = p->linesize[0];
109 if (s->bytestream + n * avctx->height > s->bytestream_end)
112 for (i=0; i<avctx->height; i++) {
114 init_put_bits(&pb, ptr, linesize);
115 for(j=0; j<avctx->width * components; j++){
118 while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
120 if(s->bytestream >= s->bytestream_end)
123 /* read a single digit */
124 v = (*s->bytestream++) - '0';
126 /* read a sequence of digits */
129 c = (*s->bytestream++) - '0';
132 put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
138 for (i = 0; i < avctx->height; i++) {
140 memcpy(ptr, s->bytestream, n);
141 else if (upgrade == 1) {
142 unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval;
143 for (j = 0; j < n; j++)
144 ptr[j] = (s->bytestream[j] * f + 64) >> 7;
145 } else if (upgrade == 2) {
146 unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval;
147 for (j = 0; j < n / 2; j++) {
148 v = av_be2ne16(((uint16_t *)s->bytestream)[j]);
149 ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
157 case PIX_FMT_YUV420P:
159 unsigned char *ptr1, *ptr2;
163 linesize = p->linesize[0];
164 if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
166 for (i = 0; i < avctx->height; i++) {
167 memcpy(ptr, s->bytestream, n);
174 h = avctx->height >> 1;
175 for (i = 0; i < h; i++) {
176 memcpy(ptr1, s->bytestream, n);
178 memcpy(ptr2, s->bytestream, n);
180 ptr1 += p->linesize[1];
181 ptr2 += p->linesize[2];
186 *picture = *(AVFrame*)&s->picture;
187 *data_size = sizeof(AVPicture);
189 return s->bytestream - s->bytestream_start;
193 #if CONFIG_PGM_DECODER
194 AVCodec ff_pgm_decoder = {
196 .type = AVMEDIA_TYPE_VIDEO,
198 .priv_data_size = sizeof(PNMContext),
201 .decode = pnm_decode_frame,
202 .capabilities = CODEC_CAP_DR1,
203 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
204 .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
208 #if CONFIG_PGMYUV_DECODER
209 AVCodec ff_pgmyuv_decoder = {
211 .type = AVMEDIA_TYPE_VIDEO,
212 .id = CODEC_ID_PGMYUV,
213 .priv_data_size = sizeof(PNMContext),
216 .decode = pnm_decode_frame,
217 .capabilities = CODEC_CAP_DR1,
218 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
219 .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
223 #if CONFIG_PPM_DECODER
224 AVCodec ff_ppm_decoder = {
226 .type = AVMEDIA_TYPE_VIDEO,
228 .priv_data_size = sizeof(PNMContext),
231 .decode = pnm_decode_frame,
232 .capabilities = CODEC_CAP_DR1,
233 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
234 .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
238 #if CONFIG_PBM_DECODER
239 AVCodec ff_pbm_decoder = {
241 .type = AVMEDIA_TYPE_VIDEO,
243 .priv_data_size = sizeof(PNMContext),
246 .decode = pnm_decode_frame,
247 .capabilities = CODEC_CAP_DR1,
248 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
249 .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
253 #if CONFIG_PAM_DECODER
254 AVCodec ff_pam_decoder = {
256 .type = AVMEDIA_TYPE_VIDEO,
258 .priv_data_size = sizeof(PNMContext),
261 .decode = pnm_decode_frame,
262 .capabilities = CODEC_CAP_DR1,
263 .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
264 .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),