|
- /*
- * 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) + 3;
- if (in) {
- out->nb_samples += in->nb_samples*(int64_t)s->out_sample_rate / s->in_sample_rate;
- }
- 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);
- }
|