ffmpeg / libavformat / yuv.c @ 5509bffa
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/*
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* .Y.U.V image format
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* Copyright (c) 2003 Fabrice Bellard.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h" |
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static int sizes[][2] = { |
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{ 640, 480 }, |
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{ 720, 480 }, |
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{ 720, 576 }, |
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{ 352, 288 }, |
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{ 352, 240 }, |
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{ 160, 128 }, |
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{ 512, 384 }, |
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{ 640, 352 }, |
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{ 640, 240 }, |
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}; |
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static int infer_size(int *width_ptr, int *height_ptr, int size) |
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{ |
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int i;
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for(i=0;i<sizeof(sizes)/sizeof(sizes[0]);i++) { |
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if ((sizes[i][0] * sizes[i][1]) == size) { |
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*width_ptr = sizes[i][0];
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*height_ptr = sizes[i][1];
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return 0; |
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} |
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} |
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return -1; |
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} |
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static int yuv_read(ByteIOContext *f, |
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int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque) |
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{ |
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ByteIOContext pb1, *pb = &pb1; |
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int img_size, ret;
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char fname[1024], *p; |
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int size;
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URLContext *h; |
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AVImageInfo info1, *info = &info1; |
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img_size = url_fsize(f); |
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/* XXX: hack hack */
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h = url_fileno(f); |
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url_get_filename(h, fname, sizeof(fname));
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if (infer_size(&info->width, &info->height, img_size) < 0) { |
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return AVERROR_IO;
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} |
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info->pix_fmt = PIX_FMT_YUV420P; |
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ret = alloc_cb(opaque, info); |
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if (ret)
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return ret;
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size = info->width * info->height; |
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p = strrchr(fname, '.');
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if (!p || p[1] != 'Y') |
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return AVERROR_IO;
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get_buffer(f, info->pict.data[0], size);
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p[1] = 'U'; |
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if (url_fopen(pb, fname, URL_RDONLY) < 0) |
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return AVERROR_IO;
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get_buffer(pb, info->pict.data[1], size / 4); |
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url_fclose(pb); |
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p[1] = 'V'; |
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if (url_fopen(pb, fname, URL_RDONLY) < 0) |
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return AVERROR_IO;
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get_buffer(pb, info->pict.data[2], size / 4); |
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url_fclose(pb); |
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return 0; |
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} |
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static int yuv_write(ByteIOContext *pb2, AVImageInfo *info) |
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{ |
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ByteIOContext pb1, *pb; |
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char fname[1024], *p; |
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int i, j, width, height;
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uint8_t *ptr; |
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URLContext *h; |
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static const char *ext = "YUV"; |
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/* XXX: hack hack */
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h = url_fileno(pb2); |
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url_get_filename(h, fname, sizeof(fname));
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p = strrchr(fname, '.');
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if (!p || p[1] != 'Y') |
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return AVERROR_IO;
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width = info->width; |
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height = info->height; |
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for(i=0;i<3;i++) { |
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if (i == 1) { |
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width >>= 1;
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height >>= 1;
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} |
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if (i >= 1) { |
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pb = &pb1; |
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p[1] = ext[i];
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if (url_fopen(pb, fname, URL_WRONLY) < 0) |
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return AVERROR_IO;
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} else {
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pb = pb2; |
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} |
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ptr = info->pict.data[i]; |
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for(j=0;j<height;j++) { |
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put_buffer(pb, ptr, width); |
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ptr += info->pict.linesize[i]; |
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} |
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put_flush_packet(pb); |
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if (i >= 1) { |
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url_fclose(pb); |
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} |
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} |
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return 0; |
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} |
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static int yuv_probe(AVProbeData *pd) |
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{ |
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if (match_ext(pd->filename, "Y")) |
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return AVPROBE_SCORE_MAX;
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else
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return 0; |
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} |
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AVImageFormat yuv_image_format = { |
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"yuv",
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"Y",
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yuv_probe, |
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yuv_read, |
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(1 << PIX_FMT_YUV420P),
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yuv_write, |
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}; |