yading@11: /* yading@11: * Copyright (c) 2012 Justin Ruggles yading@11: * yading@11: * This file is part of Libav. yading@11: * yading@11: * Libav is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * Libav is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with Libav; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include "libavutil/common.h" yading@11: #include "libavutil/dict.h" yading@11: // #include "libavutil/error.h" yading@11: #include "libavutil/log.h" yading@11: #include "libavutil/mem.h" yading@11: #include "libavutil/opt.h" yading@11: yading@11: #include "avresample.h" yading@11: #include "internal.h" yading@11: #include "audio_data.h" yading@11: #include "audio_convert.h" yading@11: #include "audio_mix.h" yading@11: #include "resample.h" yading@11: yading@11: int avresample_open(AVAudioResampleContext *avr) yading@11: { yading@11: int ret; yading@11: yading@11: /* set channel mixing parameters */ yading@11: avr->in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout); yading@11: if (avr->in_channels <= 0 || avr->in_channels > AVRESAMPLE_MAX_CHANNELS) { yading@11: av_log(avr, AV_LOG_ERROR, "Invalid input channel layout: %"PRIu64"\n", yading@11: avr->in_channel_layout); yading@11: return AVERROR(EINVAL); yading@11: } yading@11: avr->out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout); yading@11: if (avr->out_channels <= 0 || avr->out_channels > AVRESAMPLE_MAX_CHANNELS) { yading@11: av_log(avr, AV_LOG_ERROR, "Invalid output channel layout: %"PRIu64"\n", yading@11: avr->out_channel_layout); yading@11: return AVERROR(EINVAL); yading@11: } yading@11: avr->resample_channels = FFMIN(avr->in_channels, avr->out_channels); yading@11: avr->downmix_needed = avr->in_channels > avr->out_channels; yading@11: avr->upmix_needed = avr->out_channels > avr->in_channels || yading@11: (!avr->downmix_needed && (avr->mix_matrix || yading@11: avr->in_channel_layout != avr->out_channel_layout)); yading@11: avr->mixing_needed = avr->downmix_needed || avr->upmix_needed; yading@11: yading@11: /* set resampling parameters */ yading@11: avr->resample_needed = avr->in_sample_rate != avr->out_sample_rate || yading@11: avr->force_resampling; yading@11: yading@11: /* select internal sample format if not specified by the user */ yading@11: if (avr->internal_sample_fmt == AV_SAMPLE_FMT_NONE && yading@11: (avr->mixing_needed || avr->resample_needed)) { yading@11: enum AVSampleFormat in_fmt = av_get_planar_sample_fmt(avr->in_sample_fmt); yading@11: enum AVSampleFormat out_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt); yading@11: int max_bps = FFMAX(av_get_bytes_per_sample(in_fmt), yading@11: av_get_bytes_per_sample(out_fmt)); yading@11: if (max_bps <= 2) { yading@11: avr->internal_sample_fmt = AV_SAMPLE_FMT_S16P; yading@11: } else if (avr->mixing_needed) { yading@11: avr->internal_sample_fmt = AV_SAMPLE_FMT_FLTP; yading@11: } else { yading@11: if (max_bps <= 4) { yading@11: if (in_fmt == AV_SAMPLE_FMT_S32P || yading@11: out_fmt == AV_SAMPLE_FMT_S32P) { yading@11: if (in_fmt == AV_SAMPLE_FMT_FLTP || yading@11: out_fmt == AV_SAMPLE_FMT_FLTP) { yading@11: /* if one is s32 and the other is flt, use dbl */ yading@11: avr->internal_sample_fmt = AV_SAMPLE_FMT_DBLP; yading@11: } else { yading@11: /* if one is s32 and the other is s32, s16, or u8, use s32 */ yading@11: avr->internal_sample_fmt = AV_SAMPLE_FMT_S32P; yading@11: } yading@11: } else { yading@11: /* if one is flt and the other is flt, s16 or u8, use flt */ yading@11: avr->internal_sample_fmt = AV_SAMPLE_FMT_FLTP; yading@11: } yading@11: } else { yading@11: /* if either is dbl, use dbl */ yading@11: avr->internal_sample_fmt = AV_SAMPLE_FMT_DBLP; yading@11: } yading@11: } yading@11: av_log(avr, AV_LOG_DEBUG, "Using %s as internal sample format\n", yading@11: av_get_sample_fmt_name(avr->internal_sample_fmt)); yading@11: } yading@11: yading@11: /* treat all mono as planar for easier comparison */ yading@11: if (avr->in_channels == 1) yading@11: avr->in_sample_fmt = av_get_planar_sample_fmt(avr->in_sample_fmt); yading@11: if (avr->out_channels == 1) yading@11: avr->out_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt); yading@11: yading@11: /* we may need to add an extra conversion in order to remap channels if yading@11: the output format is not planar */ yading@11: if (avr->use_channel_map && !avr->mixing_needed && !avr->resample_needed && yading@11: !av_sample_fmt_is_planar(avr->out_sample_fmt)) { yading@11: avr->internal_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt); yading@11: } yading@11: yading@11: /* set sample format conversion parameters */ yading@11: if (avr->resample_needed || avr->mixing_needed) yading@11: avr->in_convert_needed = avr->in_sample_fmt != avr->internal_sample_fmt; yading@11: else yading@11: avr->in_convert_needed = avr->use_channel_map && yading@11: !av_sample_fmt_is_planar(avr->out_sample_fmt); yading@11: yading@11: if (avr->resample_needed || avr->mixing_needed || avr->in_convert_needed) yading@11: avr->out_convert_needed = avr->internal_sample_fmt != avr->out_sample_fmt; yading@11: else yading@11: avr->out_convert_needed = avr->in_sample_fmt != avr->out_sample_fmt; yading@11: yading@11: avr->in_copy_needed = !avr->in_convert_needed && (avr->mixing_needed || yading@11: (avr->use_channel_map && avr->resample_needed)); yading@11: yading@11: if (avr->use_channel_map) { yading@11: if (avr->in_copy_needed) { yading@11: avr->remap_point = REMAP_IN_COPY; yading@11: av_dlog(avr, "remap channels during in_copy\n"); yading@11: } else if (avr->in_convert_needed) { yading@11: avr->remap_point = REMAP_IN_CONVERT; yading@11: av_dlog(avr, "remap channels during in_convert\n"); yading@11: } else if (avr->out_convert_needed) { yading@11: avr->remap_point = REMAP_OUT_CONVERT; yading@11: av_dlog(avr, "remap channels during out_convert\n"); yading@11: } else { yading@11: avr->remap_point = REMAP_OUT_COPY; yading@11: av_dlog(avr, "remap channels during out_copy\n"); yading@11: } yading@11: yading@11: #ifdef DEBUG yading@11: { yading@11: int ch; yading@11: av_dlog(avr, "output map: "); yading@11: if (avr->ch_map_info.do_remap) yading@11: for (ch = 0; ch < avr->in_channels; ch++) yading@11: av_dlog(avr, " % 2d", avr->ch_map_info.channel_map[ch]); yading@11: else yading@11: av_dlog(avr, "n/a"); yading@11: av_dlog(avr, "\n"); yading@11: av_dlog(avr, "copy map: "); yading@11: if (avr->ch_map_info.do_copy) yading@11: for (ch = 0; ch < avr->in_channels; ch++) yading@11: av_dlog(avr, " % 2d", avr->ch_map_info.channel_copy[ch]); yading@11: else yading@11: av_dlog(avr, "n/a"); yading@11: av_dlog(avr, "\n"); yading@11: av_dlog(avr, "zero map: "); yading@11: if (avr->ch_map_info.do_zero) yading@11: for (ch = 0; ch < avr->in_channels; ch++) yading@11: av_dlog(avr, " % 2d", avr->ch_map_info.channel_zero[ch]); yading@11: else yading@11: av_dlog(avr, "n/a"); yading@11: av_dlog(avr, "\n"); yading@11: av_dlog(avr, "input map: "); yading@11: for (ch = 0; ch < avr->in_channels; ch++) yading@11: av_dlog(avr, " % 2d", avr->ch_map_info.input_map[ch]); yading@11: av_dlog(avr, "\n"); yading@11: } yading@11: #endif yading@11: } else yading@11: avr->remap_point = REMAP_NONE; yading@11: yading@11: /* allocate buffers */ yading@11: if (avr->in_copy_needed || avr->in_convert_needed) { yading@11: avr->in_buffer = ff_audio_data_alloc(FFMAX(avr->in_channels, avr->out_channels), yading@11: 0, avr->internal_sample_fmt, yading@11: "in_buffer"); yading@11: if (!avr->in_buffer) { yading@11: ret = AVERROR(EINVAL); yading@11: goto error; yading@11: } yading@11: } yading@11: if (avr->resample_needed) { yading@11: avr->resample_out_buffer = ff_audio_data_alloc(avr->out_channels, yading@11: 0, avr->internal_sample_fmt, yading@11: "resample_out_buffer"); yading@11: if (!avr->resample_out_buffer) { yading@11: ret = AVERROR(EINVAL); yading@11: goto error; yading@11: } yading@11: } yading@11: if (avr->out_convert_needed) { yading@11: avr->out_buffer = ff_audio_data_alloc(avr->out_channels, 0, yading@11: avr->out_sample_fmt, "out_buffer"); yading@11: if (!avr->out_buffer) { yading@11: ret = AVERROR(EINVAL); yading@11: goto error; yading@11: } yading@11: } yading@11: avr->out_fifo = av_audio_fifo_alloc(avr->out_sample_fmt, avr->out_channels, yading@11: 1024); yading@11: if (!avr->out_fifo) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto error; yading@11: } yading@11: yading@11: /* setup contexts */ yading@11: if (avr->in_convert_needed) { yading@11: avr->ac_in = ff_audio_convert_alloc(avr, avr->internal_sample_fmt, yading@11: avr->in_sample_fmt, avr->in_channels, yading@11: avr->in_sample_rate, yading@11: avr->remap_point == REMAP_IN_CONVERT); yading@11: if (!avr->ac_in) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto error; yading@11: } yading@11: } yading@11: if (avr->out_convert_needed) { yading@11: enum AVSampleFormat src_fmt; yading@11: if (avr->in_convert_needed) yading@11: src_fmt = avr->internal_sample_fmt; yading@11: else yading@11: src_fmt = avr->in_sample_fmt; yading@11: avr->ac_out = ff_audio_convert_alloc(avr, avr->out_sample_fmt, src_fmt, yading@11: avr->out_channels, yading@11: avr->out_sample_rate, yading@11: avr->remap_point == REMAP_OUT_CONVERT); yading@11: if (!avr->ac_out) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto error; yading@11: } yading@11: } yading@11: if (avr->resample_needed) { yading@11: avr->resample = ff_audio_resample_init(avr); yading@11: if (!avr->resample) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto error; yading@11: } yading@11: } yading@11: if (avr->mixing_needed) { yading@11: avr->am = ff_audio_mix_alloc(avr); yading@11: if (!avr->am) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto error; yading@11: } yading@11: } yading@11: yading@11: return 0; yading@11: yading@11: error: yading@11: avresample_close(avr); yading@11: return ret; yading@11: } yading@11: yading@11: void avresample_close(AVAudioResampleContext *avr) yading@11: { yading@11: ff_audio_data_free(&avr->in_buffer); yading@11: ff_audio_data_free(&avr->resample_out_buffer); yading@11: ff_audio_data_free(&avr->out_buffer); yading@11: av_audio_fifo_free(avr->out_fifo); yading@11: avr->out_fifo = NULL; yading@11: ff_audio_convert_free(&avr->ac_in); yading@11: ff_audio_convert_free(&avr->ac_out); yading@11: ff_audio_resample_free(&avr->resample); yading@11: ff_audio_mix_free(&avr->am); yading@11: av_freep(&avr->mix_matrix); yading@11: yading@11: avr->use_channel_map = 0; yading@11: } yading@11: yading@11: void avresample_free(AVAudioResampleContext **avr) yading@11: { yading@11: if (!*avr) yading@11: return; yading@11: avresample_close(*avr); yading@11: av_opt_free(*avr); yading@11: av_freep(avr); yading@11: } yading@11: yading@11: static int handle_buffered_output(AVAudioResampleContext *avr, yading@11: AudioData *output, AudioData *converted) yading@11: { yading@11: int ret; yading@11: yading@11: if (!output || av_audio_fifo_size(avr->out_fifo) > 0 || yading@11: (converted && output->allocated_samples < converted->nb_samples)) { yading@11: if (converted) { yading@11: /* if there are any samples in the output FIFO or if the yading@11: user-supplied output buffer is not large enough for all samples, yading@11: we add to the output FIFO */ yading@11: av_dlog(avr, "[FIFO] add %s to out_fifo\n", converted->name); yading@11: ret = ff_audio_data_add_to_fifo(avr->out_fifo, converted, 0, yading@11: converted->nb_samples); yading@11: if (ret < 0) yading@11: return ret; yading@11: } yading@11: yading@11: /* if the user specified an output buffer, read samples from the output yading@11: FIFO to the user output */ yading@11: if (output && output->allocated_samples > 0) { yading@11: av_dlog(avr, "[FIFO] read from out_fifo to output\n"); yading@11: av_dlog(avr, "[end conversion]\n"); yading@11: return ff_audio_data_read_from_fifo(avr->out_fifo, output, yading@11: output->allocated_samples); yading@11: } yading@11: } else if (converted) { yading@11: /* copy directly to output if it is large enough or there is not any yading@11: data in the output FIFO */ yading@11: av_dlog(avr, "[copy] %s to output\n", converted->name); yading@11: output->nb_samples = 0; yading@11: ret = ff_audio_data_copy(output, converted, yading@11: avr->remap_point == REMAP_OUT_COPY ? yading@11: &avr->ch_map_info : NULL); yading@11: if (ret < 0) yading@11: return ret; yading@11: av_dlog(avr, "[end conversion]\n"); yading@11: return output->nb_samples; yading@11: } yading@11: av_dlog(avr, "[end conversion]\n"); yading@11: return 0; yading@11: } yading@11: yading@11: int attribute_align_arg avresample_convert(AVAudioResampleContext *avr, yading@11: uint8_t **output, int out_plane_size, yading@11: int out_samples, uint8_t **input, yading@11: int in_plane_size, int in_samples) yading@11: { yading@11: AudioData input_buffer; yading@11: AudioData output_buffer; yading@11: AudioData *current_buffer; yading@11: int ret, direct_output; yading@11: yading@11: /* reset internal buffers */ yading@11: if (avr->in_buffer) { yading@11: avr->in_buffer->nb_samples = 0; yading@11: ff_audio_data_set_channels(avr->in_buffer, yading@11: avr->in_buffer->allocated_channels); yading@11: } yading@11: if (avr->resample_out_buffer) { yading@11: avr->resample_out_buffer->nb_samples = 0; yading@11: ff_audio_data_set_channels(avr->resample_out_buffer, yading@11: avr->resample_out_buffer->allocated_channels); yading@11: } yading@11: if (avr->out_buffer) { yading@11: avr->out_buffer->nb_samples = 0; yading@11: ff_audio_data_set_channels(avr->out_buffer, yading@11: avr->out_buffer->allocated_channels); yading@11: } yading@11: yading@11: av_dlog(avr, "[start conversion]\n"); yading@11: yading@11: /* initialize output_buffer with output data */ yading@11: direct_output = output && av_audio_fifo_size(avr->out_fifo) == 0; yading@11: if (output) { yading@11: ret = ff_audio_data_init(&output_buffer, output, out_plane_size, yading@11: avr->out_channels, out_samples, yading@11: avr->out_sample_fmt, 0, "output"); yading@11: if (ret < 0) yading@11: return ret; yading@11: output_buffer.nb_samples = 0; yading@11: } yading@11: yading@11: if (input) { yading@11: /* initialize input_buffer with input data */ yading@11: ret = ff_audio_data_init(&input_buffer, input, in_plane_size, yading@11: avr->in_channels, in_samples, yading@11: avr->in_sample_fmt, 1, "input"); yading@11: if (ret < 0) yading@11: return ret; yading@11: current_buffer = &input_buffer; yading@11: yading@11: if (avr->upmix_needed && !avr->in_convert_needed && !avr->resample_needed && yading@11: !avr->out_convert_needed && direct_output && out_samples >= in_samples) { yading@11: /* in some rare cases we can copy input to output and upmix yading@11: directly in the output buffer */ yading@11: av_dlog(avr, "[copy] %s to output\n", current_buffer->name); yading@11: ret = ff_audio_data_copy(&output_buffer, current_buffer, yading@11: avr->remap_point == REMAP_OUT_COPY ? yading@11: &avr->ch_map_info : NULL); yading@11: if (ret < 0) yading@11: return ret; yading@11: current_buffer = &output_buffer; yading@11: } else if (avr->remap_point == REMAP_OUT_COPY && yading@11: (!direct_output || out_samples < in_samples)) { yading@11: /* if remapping channels during output copy, we may need to yading@11: * use an intermediate buffer in order to remap before adding yading@11: * samples to the output fifo */ yading@11: av_dlog(avr, "[copy] %s to out_buffer\n", current_buffer->name); yading@11: ret = ff_audio_data_copy(avr->out_buffer, current_buffer, yading@11: &avr->ch_map_info); yading@11: if (ret < 0) yading@11: return ret; yading@11: current_buffer = avr->out_buffer; yading@11: } else if (avr->in_copy_needed || avr->in_convert_needed) { yading@11: /* if needed, copy or convert input to in_buffer, and downmix if yading@11: applicable */ yading@11: if (avr->in_convert_needed) { yading@11: ret = ff_audio_data_realloc(avr->in_buffer, yading@11: current_buffer->nb_samples); yading@11: if (ret < 0) yading@11: return ret; yading@11: av_dlog(avr, "[convert] %s to in_buffer\n", current_buffer->name); yading@11: ret = ff_audio_convert(avr->ac_in, avr->in_buffer, yading@11: current_buffer); yading@11: if (ret < 0) yading@11: return ret; yading@11: } else { yading@11: av_dlog(avr, "[copy] %s to in_buffer\n", current_buffer->name); yading@11: ret = ff_audio_data_copy(avr->in_buffer, current_buffer, yading@11: avr->remap_point == REMAP_IN_COPY ? yading@11: &avr->ch_map_info : NULL); yading@11: if (ret < 0) yading@11: return ret; yading@11: } yading@11: ff_audio_data_set_channels(avr->in_buffer, avr->in_channels); yading@11: if (avr->downmix_needed) { yading@11: av_dlog(avr, "[downmix] in_buffer\n"); yading@11: ret = ff_audio_mix(avr->am, avr->in_buffer); yading@11: if (ret < 0) yading@11: return ret; yading@11: } yading@11: current_buffer = avr->in_buffer; yading@11: } yading@11: } else { yading@11: /* flush resampling buffer and/or output FIFO if input is NULL */ yading@11: if (!avr->resample_needed) yading@11: return handle_buffered_output(avr, output ? &output_buffer : NULL, yading@11: NULL); yading@11: current_buffer = NULL; yading@11: } yading@11: yading@11: if (avr->resample_needed) { yading@11: AudioData *resample_out; yading@11: yading@11: if (!avr->out_convert_needed && direct_output && out_samples > 0) yading@11: resample_out = &output_buffer; yading@11: else yading@11: resample_out = avr->resample_out_buffer; yading@11: av_dlog(avr, "[resample] %s to %s\n", current_buffer->name, yading@11: resample_out->name); yading@11: ret = ff_audio_resample(avr->resample, resample_out, yading@11: current_buffer); yading@11: if (ret < 0) yading@11: return ret; yading@11: yading@11: /* if resampling did not produce any samples, just return 0 */ yading@11: if (resample_out->nb_samples == 0) { yading@11: av_dlog(avr, "[end conversion]\n"); yading@11: return 0; yading@11: } yading@11: yading@11: current_buffer = resample_out; yading@11: } yading@11: yading@11: if (avr->upmix_needed) { yading@11: av_dlog(avr, "[upmix] %s\n", current_buffer->name); yading@11: ret = ff_audio_mix(avr->am, current_buffer); yading@11: if (ret < 0) yading@11: return ret; yading@11: } yading@11: yading@11: /* if we resampled or upmixed directly to output, return here */ yading@11: if (current_buffer == &output_buffer) { yading@11: av_dlog(avr, "[end conversion]\n"); yading@11: return current_buffer->nb_samples; yading@11: } yading@11: yading@11: if (avr->out_convert_needed) { yading@11: if (direct_output && out_samples >= current_buffer->nb_samples) { yading@11: /* convert directly to output */ yading@11: av_dlog(avr, "[convert] %s to output\n", current_buffer->name); yading@11: ret = ff_audio_convert(avr->ac_out, &output_buffer, current_buffer); yading@11: if (ret < 0) yading@11: return ret; yading@11: yading@11: av_dlog(avr, "[end conversion]\n"); yading@11: return output_buffer.nb_samples; yading@11: } else { yading@11: ret = ff_audio_data_realloc(avr->out_buffer, yading@11: current_buffer->nb_samples); yading@11: if (ret < 0) yading@11: return ret; yading@11: av_dlog(avr, "[convert] %s to out_buffer\n", current_buffer->name); yading@11: ret = ff_audio_convert(avr->ac_out, avr->out_buffer, yading@11: current_buffer); yading@11: if (ret < 0) yading@11: return ret; yading@11: current_buffer = avr->out_buffer; yading@11: } yading@11: } yading@11: yading@11: return handle_buffered_output(avr, output ? &output_buffer : NULL, yading@11: current_buffer); yading@11: } yading@11: yading@11: int avresample_get_matrix(AVAudioResampleContext *avr, double *matrix, yading@11: int stride) yading@11: { yading@11: int in_channels, out_channels, i, o; yading@11: yading@11: if (avr->am) yading@11: return ff_audio_mix_get_matrix(avr->am, matrix, stride); yading@11: yading@11: in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout); yading@11: out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout); yading@11: yading@11: if ( in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS || yading@11: out_channels <= 0 || out_channels > AVRESAMPLE_MAX_CHANNELS) { yading@11: av_log(avr, AV_LOG_ERROR, "Invalid channel layouts\n"); yading@11: return AVERROR(EINVAL); yading@11: } yading@11: yading@11: if (!avr->mix_matrix) { yading@11: av_log(avr, AV_LOG_ERROR, "matrix is not set\n"); yading@11: return AVERROR(EINVAL); yading@11: } yading@11: yading@11: for (o = 0; o < out_channels; o++) yading@11: for (i = 0; i < in_channels; i++) yading@11: matrix[o * stride + i] = avr->mix_matrix[o * in_channels + i]; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: int avresample_set_matrix(AVAudioResampleContext *avr, const double *matrix, yading@11: int stride) yading@11: { yading@11: int in_channels, out_channels, i, o; yading@11: yading@11: if (avr->am) yading@11: return ff_audio_mix_set_matrix(avr->am, matrix, stride); yading@11: yading@11: in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout); yading@11: out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout); yading@11: yading@11: if ( in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS || yading@11: out_channels <= 0 || out_channels > AVRESAMPLE_MAX_CHANNELS) { yading@11: av_log(avr, AV_LOG_ERROR, "Invalid channel layouts\n"); yading@11: return AVERROR(EINVAL); yading@11: } yading@11: yading@11: if (avr->mix_matrix) yading@11: av_freep(&avr->mix_matrix); yading@11: avr->mix_matrix = av_malloc(in_channels * out_channels * yading@11: sizeof(*avr->mix_matrix)); yading@11: if (!avr->mix_matrix) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: for (o = 0; o < out_channels; o++) yading@11: for (i = 0; i < in_channels; i++) yading@11: avr->mix_matrix[o * in_channels + i] = matrix[o * stride + i]; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: int avresample_set_channel_mapping(AVAudioResampleContext *avr, yading@11: const int *channel_map) yading@11: { yading@11: ChannelMapInfo *info = &avr->ch_map_info; yading@11: int in_channels, ch, i; yading@11: yading@11: in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout); yading@11: if (in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS) { yading@11: av_log(avr, AV_LOG_ERROR, "Invalid input channel layout\n"); yading@11: return AVERROR(EINVAL); yading@11: } yading@11: yading@11: memset(info, 0, sizeof(*info)); yading@11: memset(info->input_map, -1, sizeof(info->input_map)); yading@11: yading@11: for (ch = 0; ch < in_channels; ch++) { yading@11: if (channel_map[ch] >= in_channels) { yading@11: av_log(avr, AV_LOG_ERROR, "Invalid channel map\n"); yading@11: return AVERROR(EINVAL); yading@11: } yading@11: if (channel_map[ch] < 0) { yading@11: info->channel_zero[ch] = 1; yading@11: info->channel_map[ch] = -1; yading@11: info->do_zero = 1; yading@11: } else if (info->input_map[channel_map[ch]] >= 0) { yading@11: info->channel_copy[ch] = info->input_map[channel_map[ch]]; yading@11: info->channel_map[ch] = -1; yading@11: info->do_copy = 1; yading@11: } else { yading@11: info->channel_map[ch] = channel_map[ch]; yading@11: info->input_map[channel_map[ch]] = ch; yading@11: info->do_remap = 1; yading@11: } yading@11: } yading@11: /* Fill-in unmapped input channels with unmapped output channels. yading@11: This is used when remapping during conversion from interleaved to yading@11: planar format. */ yading@11: for (ch = 0, i = 0; ch < in_channels && i < in_channels; ch++, i++) { yading@11: while (ch < in_channels && info->input_map[ch] >= 0) yading@11: ch++; yading@11: while (i < in_channels && info->channel_map[i] >= 0) yading@11: i++; yading@11: if (ch >= in_channels || i >= in_channels) yading@11: break; yading@11: info->input_map[ch] = i; yading@11: } yading@11: yading@11: avr->use_channel_map = 1; yading@11: return 0; yading@11: } yading@11: yading@11: int avresample_available(AVAudioResampleContext *avr) yading@11: { yading@11: return av_audio_fifo_size(avr->out_fifo); yading@11: } yading@11: yading@11: int avresample_read(AVAudioResampleContext *avr, uint8_t **output, int nb_samples) yading@11: { yading@11: if (!output) yading@11: return av_audio_fifo_drain(avr->out_fifo, nb_samples); yading@11: return av_audio_fifo_read(avr->out_fifo, (void**)output, nb_samples); yading@11: } yading@11: yading@11: unsigned avresample_version(void) yading@11: { yading@11: return LIBAVRESAMPLE_VERSION_INT; yading@11: } yading@11: yading@11: const char *avresample_license(void) yading@11: { yading@11: #define LICENSE_PREFIX "libavresample license: " yading@11: return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1; yading@11: } yading@11: yading@11: const char *avresample_configuration(void) yading@11: { yading@11: return FFMPEG_CONFIGURATION; yading@11: }