| /* |
| * 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); |
| } |
| |