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-rw-r--r--libavutil/samplefmt.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/libavutil/samplefmt.c b/libavutil/samplefmt.c
new file mode 100644
index 0000000000..ea004d926a
--- /dev/null
+++ b/libavutil/samplefmt.c
@@ -0,0 +1,120 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "samplefmt.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct SampleFmtInfo {
+ const char *name;
+ int bits;
+} SampleFmtInfo;
+
+/** this table gives more information about formats */
+static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
+ [AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8 },
+ [AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16 },
+ [AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32 },
+ [AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32 },
+ [AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64 },
+};
+
+const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
+{
+ if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
+ return NULL;
+ return sample_fmt_info[sample_fmt].name;
+}
+
+enum AVSampleFormat av_get_sample_fmt(const char *name)
+{
+ int i;
+
+ for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
+ if (!strcmp(sample_fmt_info[i].name, name))
+ return i;
+ return AV_SAMPLE_FMT_NONE;
+}
+
+char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
+{
+ /* print header */
+ if (sample_fmt < 0)
+ snprintf(buf, buf_size, "name " " depth");
+ else if (sample_fmt < AV_SAMPLE_FMT_NB) {
+ SampleFmtInfo info = sample_fmt_info[sample_fmt];
+ snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
+ }
+
+ return buf;
+}
+
+int av_get_bits_per_sample_fmt(enum AVSampleFormat sample_fmt)
+{
+ return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
+ 0 : sample_fmt_info[sample_fmt].bits;
+}
+
+int av_samples_fill_arrays(uint8_t *pointers[8], int linesizes[8],
+ uint8_t *buf, int nb_channels, int nb_samples,
+ enum AVSampleFormat sample_fmt, int planar, int align)
+{
+ int i, step_size = 0;
+ int sample_size = av_get_bits_per_sample_fmt(sample_fmt) >> 3;
+ int channel_step = planar ? FFALIGN(nb_samples*sample_size, align) : sample_size;
+
+ if(nb_channels * (uint64_t)nb_samples * sample_size >= INT_MAX - align*(uint64_t)nb_channels)
+ return AVERROR(EINVAL);
+
+ if (pointers) {
+ pointers[0] = buf;
+ for (i = 0; i < nb_channels; i++) {
+ pointers[i] = buf + step_size;
+ step_size += channel_step;
+ }
+ memset(&pointers[nb_channels], 0, (8-nb_channels) * sizeof(pointers[0]));
+ }
+
+ if (linesizes) {
+ linesizes[0] = planar ? sample_size : nb_channels*sample_size;
+ memset(&linesizes[1], 0, (8-1) * sizeof(linesizes[0]));
+ }
+
+ return planar ? channel_step * nb_channels : FFALIGN(nb_channels*sample_size*nb_samples, align);
+}
+
+int av_samples_alloc(uint8_t *pointers[8], int linesizes[8],
+ int nb_samples, int nb_channels,
+ enum AVSampleFormat sample_fmt, int planar,
+ int align)
+{
+ uint8_t *buf;
+ int size = av_samples_fill_arrays(NULL, NULL,
+ NULL, nb_channels, nb_samples,
+ sample_fmt, planar, align);
+
+ buf = av_mallocz(size);
+ if (!buf)
+ return AVERROR(ENOMEM);
+
+ return av_samples_fill_arrays(pointers, linesizes,
+ buf, nb_channels, nb_samples,
+ sample_fmt, planar, align);
+}