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lavd/lavfi: work with non-mappable files for graph_file option 

Example of non-mappable file is /dev/stdin. Previously passing it as
graph_file value returned error.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Andrey Utkin 2014-07-23 16:12:39 +03:00 committed by Michael Niedermayer
parent 8a4c0866dc
commit b6a6459a24
1 changed files with 15 additions and 15 deletions
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30
libavdevice/lavfi.c
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@ -115,23 +115,23 @@ av_cold static int lavfi_read_header(AVFormatContext *avctx)
}
if (lavfi->graph_filename) {
uint8_t *file_buf, *graph_buf;
size_t file_bufsize;
ret = av_file_map(lavfi->graph_filename,
&file_buf, &file_bufsize, 0, avctx);
AVBPrint graph_file_pb;
AVIOContext *avio = NULL;
ret = avio_open(&avio, lavfi->graph_filename, AVIO_FLAG_READ);
if (ret < 0)
goto end;
/* create a 0-terminated string based on the read file */
graph_buf = av_malloc(file_bufsize + 1);
if (!graph_buf) {
av_file_unmap(file_buf, file_bufsize);
FAIL(AVERROR(ENOMEM));
FAIL(ret);
av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
avio_close(avio);
av_bprint_chars(&graph_file_pb, '\0', 1);
if (!ret && !av_bprint_is_complete(&graph_file_pb))
ret = AVERROR(ENOMEM);
if (ret) {
av_bprint_finalize(&graph_file_pb, NULL);
FAIL(ret);
}
memcpy(graph_buf, file_buf, file_bufsize);
graph_buf[file_bufsize] = 0;
av_file_unmap(file_buf, file_bufsize);
lavfi->graph_str = graph_buf;
if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
FAIL(ret);
}
if (!lavfi->graph_str)