xufuji456
2 years ago
parent
70cb21cf5c
commit
1f20cb0580
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//
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// Created by xu fulong on 2022/7/12.
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//
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#include <jni.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#include "libavformat/avformat.h" |
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#include <libavutil/opt.h> |
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#include <libavutil/channel_layout.h> |
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#include <libavutil/samplefmt.h> |
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#include <libswresample/swresample.h> |
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#ifdef __cplusplus |
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} |
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#endif |
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#include "ffmpeg_jni_define.h" |
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#define ALOGE(Format, ...) LOGE("audio_resample", Format, ##__VA_ARGS__) |
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static int get_format_from_sample_fmt(const char **fmt, enum AVSampleFormat sample_fmt) |
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{ |
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*fmt = nullptr; |
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struct sample_fmt_entry { |
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enum AVSampleFormat sample_fmt; const char *fmt_be, *fmt_le; |
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} sample_fmt_entries[] = { |
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{ AV_SAMPLE_FMT_U8, "u8", "u8" }, |
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{ AV_SAMPLE_FMT_S16, "s16be", "s16le" }, |
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{ AV_SAMPLE_FMT_S32, "s32be", "s32le" }, |
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{ AV_SAMPLE_FMT_FLT, "f32be", "f32le" }, |
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{ AV_SAMPLE_FMT_DBL, "f64be", "f64le" }, |
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}; |
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for (int i = 0; i < FF_ARRAY_ELEMS(sample_fmt_entries); i++) { |
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struct sample_fmt_entry *entry = &sample_fmt_entries[i]; |
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if (sample_fmt == entry->sample_fmt) { |
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*fmt = AV_NE(entry->fmt_be, entry->fmt_le); |
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return 0; |
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} |
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} |
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ALOGE("Sample format %s not supported as output format, msg=%s\n", |
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av_get_sample_fmt_name(sample_fmt), strerror(errno)); |
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return AVERROR(EINVAL); |
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} |
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int resampling(const char *src_filename, const char *dst_filename, int dst_rate) |
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{ |
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int src_rate = 0; |
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int src_linesize; |
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int src_nb_channels; |
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int src_nb_samples = 0; |
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int64_t src_ch_layout = AV_CH_LAYOUT_STEREO; |
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enum AVSampleFormat src_sample_fmt = AV_SAMPLE_FMT_S16; |
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int dst_bufsize; |
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int dst_linesize; |
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int dst_nb_channels; |
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uint8_t **dst_data = nullptr; |
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int dst_nb_samples, max_dst_nb_samples; |
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int64_t dst_ch_layout = AV_CH_LAYOUT_SURROUND; |
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enum AVSampleFormat dst_sample_fmt = AV_SAMPLE_FMT_S16; |
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int ret; |
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const char *fmt; |
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AVPacket packet; |
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AVFrame *frame; |
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int got_frame_ptr; |
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struct SwrContext *swr_ctx; |
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AVFormatContext *iformat_ctx = nullptr; |
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AVFormatContext *oformat_ctx = nullptr; |
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ret = avformat_open_input(&iformat_ctx, src_filename, nullptr, nullptr); |
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if (ret < 0) { |
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ALOGE("open input fail, path=%s, ret=%d", src_filename, ret); |
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goto end; |
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} |
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/* create resample context */ |
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swr_ctx = swr_alloc(); |
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if (!swr_ctx) { |
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ALOGE("Could not allocate resample context:%s\n", strerror(errno)); |
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ret = AVERROR(ENOMEM); |
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goto end; |
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} |
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/* set options */ |
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av_opt_set_int(swr_ctx, "in_channel_layout", src_ch_layout, 0); |
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av_opt_set_int(swr_ctx, "in_sample_rate", src_rate, 0); |
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av_opt_set_sample_fmt(swr_ctx, "in_sample_fmt", src_sample_fmt, 0); |
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av_opt_set_int(swr_ctx, "out_channel_layout", dst_ch_layout, 0); |
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av_opt_set_int(swr_ctx, "out_sample_rate", dst_rate, 0); |
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av_opt_set_sample_fmt(swr_ctx, "out_sample_fmt", dst_sample_fmt, 0); |
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/* initialize the resampling context */ |
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if ((ret = swr_init(swr_ctx)) < 0) { |
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ALOGE("Failed to initialize the resampling context:%s\n", strerror(errno)); |
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goto end; |
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} |
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/* allocate source and destination samples buffers */ |
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src_nb_channels = av_get_channel_layout_nb_channels(src_ch_layout); |
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/* compute the number of converted samples: buffering is avoided
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* ensuring that the output buffer will contain at least all the |
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* converted input samples */ |
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max_dst_nb_samples = dst_nb_samples = |
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(int) av_rescale_rnd(src_nb_samples, dst_rate, src_rate, AV_ROUND_UP); |
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/* buffer is going to be directly written to a raw-audio file, no alignment */ |
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dst_nb_channels = av_get_channel_layout_nb_channels(dst_ch_layout); |
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ret = av_samples_alloc_array_and_samples(&dst_data, &dst_linesize, dst_nb_channels, |
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dst_nb_samples, dst_sample_fmt, 0); |
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if (ret < 0) { |
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ALOGE("Could not allocate destination samples:%s\n", strerror(errno)); |
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goto end; |
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} |
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avformat_alloc_output_context2(&oformat_ctx, nullptr, nullptr, dst_filename); |
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av_dump_format(oformat_ctx, 0, dst_filename, 1); |
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if (!(oformat_ctx->oformat->flags & AVFMT_NOFILE)) { |
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ret = avio_open(&oformat_ctx->pb, dst_filename, AVIO_FLAG_WRITE); |
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if (ret < 0) { |
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ALOGE("Could not open output file %s\n", dst_filename); |
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return ret; |
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} |
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} |
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/* init muxer, write output file header */ |
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ret = avformat_write_header(oformat_ctx, nullptr); |
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if (ret < 0) { |
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ALOGE("Error occurred when opening output file\n"); |
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return ret; |
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} |
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while (av_read_frame(iformat_ctx, &packet) >= 0) { |
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/* compute destination number of samples */ |
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dst_nb_samples = (int) av_rescale_rnd(swr_get_delay(swr_ctx, src_rate) + |
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src_nb_samples, dst_rate, src_rate, AV_ROUND_UP); |
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if (dst_nb_samples > max_dst_nb_samples) { |
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av_freep(&dst_data[0]); |
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ret = av_samples_alloc(dst_data, &dst_linesize, dst_nb_channels, |
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dst_nb_samples, dst_sample_fmt, 1); |
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if (ret < 0) |
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break; |
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max_dst_nb_samples = dst_nb_samples; |
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} |
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ret = avcodec_decode_audio4(iformat_ctx, frame, &got_frame_ptr, packet); |
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if (ret < 0) { |
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ALOGE("decode audio error:%d\n", ret); |
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continue; |
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} |
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/* convert to destination format */ |
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ret = swr_convert(swr_ctx, dst_data, dst_nb_samples, (const uint8_t **)frame->data, frame->nb_samples); |
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if (ret < 0) { |
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ALOGE("Error while converting:%s\n", strerror(errno)); |
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goto end; |
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} |
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dst_bufsize = av_samples_get_buffer_size(&dst_linesize, dst_nb_channels, |
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ret, dst_sample_fmt, 1); |
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if (dst_bufsize < 0) { |
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ALOGE("Could not get sample buffer size:%s\n", strerror(errno)); |
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goto end; |
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} |
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AVStream *in_stream = iformat_ctx->streams[0]; |
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AVStream *out_stream = oformat_ctx->streams[0]; |
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pkt->pts = av_rescale_q_rnd(packet.pts, in_stream->time_base, out_stream->time_base, |
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static_cast<AVRounding>(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX)); |
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pkt->dts = av_rescale_q_rnd(packet.dts, in_stream->time_base, out_stream->time_base, |
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static_cast<AVRounding>(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX)); |
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pkt->duration = av_rescale_q(packet.duration, in_stream->time_base, out_stream->time_base); |
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pkt->pos = -1; |
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av_interleaved_write_frame(oformat_ctx, pkt); |
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av_packet_unref(&packet); |
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} |
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if ((ret = get_format_from_sample_fmt(&fmt, dst_sample_fmt)) < 0) |
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goto end; |
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ALOGE("Resampling succeeded. Play the output file with the command:\n" |
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"ffplay -f %s -channel_layout %" PRId64 " -channels %d -ar %d %s\n", |
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fmt, dst_ch_layout, dst_nb_channels, dst_rate, dst_filename); |
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end: |
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if (dst_data) |
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av_freep(&dst_data[0]); |
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av_freep(&dst_data); |
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swr_free(&swr_ctx); |
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av_write_trailer(oformat_ctx); |
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if (!(oformat_ctx->oformat->flags & AVFMT_NOFILE)) { |
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avio_close(oformat_ctx->pb); |
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} |
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avformat_free_context(oformat_ctx); |
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avformat_close_input(&iformat_ctx); |
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return ret; |
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} |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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VIDEO_PLAYER_FUNC(int, audioResample, jstring srcFile, jstring dstFile, int sampleRate) { |
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const char *src_file = env->GetStringUTFChars(srcFile, JNI_FALSE); |
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const char *dst_file = env->GetStringUTFChars(dstFile, JNI_FALSE); |
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int ret = resampling(src_file, dst_file, sampleRate); |
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env->ReleaseStringUTFChars(dstFile, dst_file); |
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env->ReleaseStringUTFChars(srcFile, src_file); |
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return ret; |
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} |
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#ifdef __cplusplus |
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} |
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#endif |
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