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-rw-r--r--libswresample/swresample_frame.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/libswresample/swresample_frame.c b/libswresample/swresample_frame.c
new file mode 100644
index 0000000..71d3ed7
--- /dev/null
+++ b/libswresample/swresample_frame.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2014 Luca Barbato <lu_zero@gentoo.org>
+ * Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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 "swresample_internal.h"
+#include "libavutil/frame.h"
+#include "libavutil/opt.h"
+
+int swr_config_frame(SwrContext *s, const AVFrame *out, const AVFrame *in)
+{
+ swr_close(s);
+
+ if (in) {
+ if (av_opt_set_int(s, "icl", in->channel_layout, 0) < 0)
+ goto fail;
+ if (av_opt_set_int(s, "isf", in->format, 0) < 0)
+ goto fail;
+ if (av_opt_set_int(s, "isr", in->sample_rate, 0) < 0)
+ goto fail;
+ }
+
+ if (out) {
+ if (av_opt_set_int(s, "ocl", out->channel_layout, 0) < 0)
+ goto fail;
+ if (av_opt_set_int(s, "osf", out->format, 0) < 0)
+ goto fail;
+ if (av_opt_set_int(s, "osr", out->sample_rate, 0) < 0)
+ goto fail;
+ }
+
+ return 0;
+fail:
+ av_log(s, AV_LOG_ERROR, "Failed to set option\n");
+ return AVERROR(EINVAL);
+}
+
+static int config_changed(SwrContext *s,
+ const AVFrame *out, const AVFrame *in)
+{
+ int ret = 0;
+
+ if (in) {
+ if (s->in_ch_layout != in->channel_layout ||
+ s->in_sample_rate != in->sample_rate ||
+ s->in_sample_fmt != in->format) {
+ ret |= AVERROR_INPUT_CHANGED;
+ }
+ }
+
+ if (out) {
+ if (s->out_ch_layout != out->channel_layout ||
+ s->out_sample_rate != out->sample_rate ||
+ s->out_sample_fmt != out->format) {
+ ret |= AVERROR_OUTPUT_CHANGED;
+ }
+ }
+
+ return ret;
+}
+
+static inline int convert_frame(SwrContext *s,
+ AVFrame *out, const AVFrame *in)
+{
+ int ret;
+ uint8_t **out_data = NULL;
+ const uint8_t **in_data = NULL;
+ int out_nb_samples = 0, in_nb_samples = 0;
+
+ if (out) {
+ out_data = out->extended_data;
+ out_nb_samples = out->nb_samples;
+ }
+
+ if (in) {
+ in_data = (const uint8_t **)in->extended_data;
+ in_nb_samples = in->nb_samples;
+ }
+
+ ret = swr_convert(s, out_data, out_nb_samples, in_data, in_nb_samples);
+
+ if (ret < 0) {
+ if (out)
+ out->nb_samples = 0;
+ return ret;
+ }
+
+ if (out)
+ out->nb_samples = ret;
+
+ return 0;
+}
+
+static inline int available_samples(AVFrame *out)
+{
+ int bytes_per_sample = av_get_bytes_per_sample(out->format);
+ int samples = out->linesize[0] / bytes_per_sample;
+
+ if (av_sample_fmt_is_planar(out->format)) {
+ return samples;
+ } else {
+ int channels = av_get_channel_layout_nb_channels(out->channel_layout);
+ return samples / channels;
+ }
+}
+
+int swr_convert_frame(SwrContext *s,
+ AVFrame *out, const AVFrame *in)
+{
+ int ret, setup = 0;
+
+ if (!swr_is_initialized(s)) {
+ if ((ret = swr_config_frame(s, out, in)) < 0)
+ return ret;
+ if ((ret = swr_init(s)) < 0)
+ return ret;
+ setup = 1;
+ } else {
+ // return as is or reconfigure for input changes?
+ if ((ret = config_changed(s, out, in)))
+ return ret;
+ }
+
+ if (out) {
+ if (!out->linesize[0]) {
+ out->nb_samples = swr_get_delay(s, s->out_sample_rate)
+ + in->nb_samples*(int64_t)s->out_sample_rate / s->in_sample_rate
+ + 3;
+ if ((ret = av_frame_get_buffer(out, 0)) < 0) {
+ if (setup)
+ swr_close(s);
+ return ret;
+ }
+ } else {
+ if (!out->nb_samples)
+ out->nb_samples = available_samples(out);
+ }
+ }
+
+ return convert_frame(s, out, in);
+}
+
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