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Based on commit fb1ddcd by Luca Barbato <[email protected]> Adapted for libswresample by Michael Niedermayer Signed-off-by: Michael Niedermayer <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| /* | ||
| * Copyright (c) 2014 Luca Barbato <[email protected]> | ||
| * Copyright (c) 2014 Michael Niedermayer <[email protected]> | ||
| * | ||
| * 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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