add codec
This commit is contained in:
cfanfrank
commit
3ce06bb9a1
81
codec/aacdec.go
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81
codec/aacdec.go
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@ -0,0 +1,81 @@
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package codec
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import (
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/*
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#include <libavcodec/avcodec.h>
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#include <libavutil/avutil.h>
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#include <string.h>
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#include <stdio.h>
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typedef struct {
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AVCodec *c;
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AVCodecContext *ctx;
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AVFrame *f;
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int got;
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} aacdec_t ;
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static int aacdec_new(aacdec_t *m, uint8_t *buf, int len) {
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m->c = avcodec_find_decoder(CODEC_ID_AAC);
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m->ctx = avcodec_alloc_context3(m->c);
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m->f = avcodec_alloc_frame();
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m->ctx->extradata = buf;
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m->ctx->extradata_size = len;
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m->ctx->debug = 0x3;
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av_log(m->ctx, AV_LOG_DEBUG, "m %p\n", m);
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return avcodec_open2(m->ctx, m->c, 0);
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}
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static void aacdec_decode(aacdec_t *m, uint8_t *data, int len) {
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AVPacket pkt;
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av_init_packet(&pkt);
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pkt.data = data;
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pkt.size = len;
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av_log(m->ctx, AV_LOG_DEBUG, "decode %p\n", m);
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avcodec_decode_audio4(m->ctx, m->f, &m->got, &pkt);
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av_log(m->ctx, AV_LOG_DEBUG, "got %d\n", m->got);
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}
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*/
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"C"
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"unsafe"
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"errors"
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)
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type AACDecoder struct {
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m C.aacdec_t
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}
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func NewAACDecoder(cfg []byte) (m *AACDecoder, err error) {
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m = &AACDecoder{}
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r := C.aacdec_new(
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&m.m,
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(*C.uint8_t)(unsafe.Pointer(&cfg[0])),
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(C.int)(len(cfg)),
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)
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if int(r) != 0 {
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err = errors.New("avcodec open failed")
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}
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return
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}
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func (m *AACDecoder) Decode(data []byte) (sample []byte, err error) {
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C.aacdec_decode(
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&m.m,
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(*C.uint8_t)(unsafe.Pointer(&data[0])),
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(C.int)(len(data)),
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)
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if int(m.m.got) == 0 {
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err = errors.New("no data")
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return
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}
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sample = make([]byte, 8192)
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for i := 0; i < 2; i++ {
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C.memcpy(
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unsafe.Pointer(&sample[i*4096]),
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unsafe.Pointer(m.m.f.data[i]),
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(C.size_t)(4096),
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)
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}
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return
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}
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83
codec/aacenc.go
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83
codec/aacenc.go
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@ -0,0 +1,83 @@
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package codec
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import (
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/*
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#include <libavcodec/avcodec.h>
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#include <libavutil/avutil.h>
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#include <string.h>
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typedef struct {
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AVCodec *c;
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AVCodecContext *ctx;
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AVFrame *f;
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int got;
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uint8_t buf[1024*10]; int size;
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} aacenc_t ;
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static void aacenc_new(aacenc_t *m) {
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m->c = avcodec_find_encoder(CODEC_ID_AAC);
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m->ctx = avcodec_alloc_context3(m->c);
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m->ctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
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m->ctx->sample_rate = 44100;
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m->ctx->bit_rate = 100000;
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m->ctx->channels = 2;
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m->ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
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m->f = avcodec_alloc_frame();
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avcodec_open2(m->ctx, m->c, 0);
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av_log(m->ctx, AV_LOG_DEBUG, "extra %d\n", m->ctx->extradata_size);
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}
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static void aacenc_encode(aacenc_t *m) {
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AVPacket pkt;
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av_init_packet(&pkt);
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pkt.data = m->buf;
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pkt.size = sizeof(m->buf);
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m->f->nb_samples = 1024;
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m->f->extended_data = m->f->data;
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m->f->linesize[0] = 4096;
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avcodec_encode_audio2(m->ctx, &pkt, m->f, &m->got);
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av_log(m->ctx, AV_LOG_DEBUG, "got %d size %d\n", m->got, pkt.size);
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m->size = pkt.size;
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}
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*/
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"C"
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"unsafe"
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"errors"
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)
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type AACEncoder struct {
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m C.aacenc_t
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Cfg []byte // AAC Audio config
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}
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// only supported fltp,stereo,44100khz. If you need other config, it's easy to modify code
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func NewAACEncoder() (m *AACEncoder) {
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m = &AACEncoder{}
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C.aacenc_new(&m.m)
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m.Cfg = make([]byte, (int)(m.m.ctx.extradata_size))
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C.memcpy(
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unsafe.Pointer(&m.Cfg[0]),
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unsafe.Pointer(&m.m.ctx.extradata),
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(C.size_t)(len(m.Cfg)),
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)
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return
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}
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func (m *AACEncoder) Encode(sample []byte) (ret []byte, err error) {
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m.m.f.data[0] = (*C.uint8_t)(unsafe.Pointer(&sample[0]))
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m.m.f.data[1] = (*C.uint8_t)(unsafe.Pointer(&sample[4096]))
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C.aacenc_encode(&m.m)
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if int(m.m.got) == 0 {
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err = errors.New("no data")
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return
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}
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ret = make([]byte, (int)(m.m.size))
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C.memcpy(
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unsafe.Pointer(&ret[0]),
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unsafe.Pointer(&m.m.buf[0]),
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(C.size_t)(m.m.size),
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)
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return
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}
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88
codec/h264dec.go
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88
codec/h264dec.go
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@ -0,0 +1,88 @@
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package codec
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import (
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/*
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/avutil.h>
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typedef struct {
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AVCodec *c;
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AVCodecContext *ctx;
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AVFrame *f;
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int got;
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} h264dec_t ;
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static int h264dec_new(h264dec_t *h, uint8_t *data, int len) {
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h->c = avcodec_find_decoder(CODEC_ID_H264);
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h->ctx = avcodec_alloc_context3(h->c);
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h->f = avcodec_alloc_frame();
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h->ctx->extradata = data;
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h->ctx->extradata_size = len;
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h->ctx->debug = 0x3;
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return avcodec_open2(h->ctx, h->c, 0);
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}
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static void h264dec_decode(h264dec_t *h, uint8_t *data, int len) {
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AVPacket pkt;
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av_init_packet(&pkt);
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pkt.data = data;
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pkt.size = len;
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avcodec_decode_video2(h->ctx, h->f, &h->got, &pkt);
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av_log(h->ctx, AV_LOG_DEBUG, "got %d\n", h->got);
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}
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*/
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"C"
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"unsafe"
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"errors"
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"image"
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)
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type H264Decoder struct {
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m C.h264dec_t
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}
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func NewH264Decoder(pps []byte) (m *H264Decoder, err error) {
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m = &H264Decoder{}
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r := C.h264dec_new(
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&m.m,
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(*C.uint8_t)(unsafe.Pointer(&pps[0])),
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(C.int)(len(pps)),
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)
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if int(r) != 0 {
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m = nil
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err = errors.New("open codec failed")
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}
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return
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}
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func (m *H264Decoder) Decode(nal []byte) (f *image.YCbCr, err error) {
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C.h264dec_decode(
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&m.m,
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(*C.uint8_t)(unsafe.Pointer(&nal[0])),
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(C.int)(len(nal)),
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)
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if m.m.got == 0 {
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err = errors.New("no picture")
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return
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}
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w := int(m.m.f.width)
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h := int(m.m.f.height)
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ys := int(m.m.f.linesize[0])
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cs := int(m.m.f.linesize[1])
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f = &image.YCbCr{
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Y: fromCPtr(unsafe.Pointer(m.m.f.data[0]), ys*h),
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Cb: fromCPtr(unsafe.Pointer(m.m.f.data[1]), cs*h/2),
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Cr: fromCPtr(unsafe.Pointer(m.m.f.data[2]), cs*h/2),
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YStride: ys,
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CStride: cs,
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SubsampleRatio: image.YCbCrSubsampleRatio420,
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Rect: image.Rect(0, 0, w, h),
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}
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return
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}
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123
codec/h264enc.go
Normal file
123
codec/h264enc.go
Normal file
@ -0,0 +1,123 @@
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package codec
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import (
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/*
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <x264.h>
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typedef struct {
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x264_t *x;
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int w, h;
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uint8_t *pps; int ppslen;
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uint8_t *sei; int seilen;
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x264_picture_t in;
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x264_nal_t *nal; int nnal; int nallen;
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} h264enc_t;
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static void h264enc_new(h264enc_t *m) {
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x264_param_t p;
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x264_param_default(&p);
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x264_param_default_preset(&p, "ultrafast", "zerolatency");
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x264_param_apply_profile(&p, "main");
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p.rc.i_bitrate = 50;
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p.rc.i_rc_method = X264_RC_ABR;
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p.i_width = m->w;
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p.i_height = m->h;
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p.i_csp = X264_CSP_I420;
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m->x = x264_encoder_open(&p);
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if (!m->x) {
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return ;
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}
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x264_nal_t *nal;
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int nnal, i;
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uint8_t *pps;
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m->ppslen = x264_encoder_headers(m->x, &nal, &nnal);
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m->pps = pps = malloc(m->ppslen);
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for (i = 0; i < nnal; i++) {
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//printf("nal#%d %d\n", i, nal[i].i_type);
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if (nal[i].i_type != NAL_SEI) {
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memcpy(pps, nal[i].p_payload, nal[i].i_payload);
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pps += nal[i].i_payload;
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} else {
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m->seilen = nal[i].i_payload;
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m->sei = malloc(m->seilen);
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memcpy(m->sei, nal[i].p_payload, m->seilen);
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}
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}
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m->ppslen = pps - m->pps;
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}
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static void h264enc_encode(h264enc_t *m) {
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x264_picture_t out;
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m->in.img.i_csp = X264_CSP_I420;
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m->in.i_type = X264_TYPE_AUTO;
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x264_encoder_encode(m->x, &m->nal, &m->nnal, &m->in, &out);
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m->nallen = 0;
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int i;
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if (m->seilen)
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m->nallen += m->seilen;
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for (i = 0; i < m->nnal; i++) {
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m->nallen += m->nal[i].i_payload;
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}
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}
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static void h264enc_copy(h264enc_t *m, uint8_t *p) {
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int i;
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if (m->seilen) {
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memcpy(p, m->sei, m->seilen);
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p += m->seilen;
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m->seilen = 0;
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}
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for (i = 0; i < m->nnal; i++) {
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memcpy(p, m->nal[i].p_payload, m->nal[i].i_payload);
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p += m->nal[i].i_payload;
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}
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}
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*/
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"C"
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"unsafe"
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"image"
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)
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type H264Encoder struct {
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m C.h264enc_t
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PPS []byte
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}
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func NewH264Encoder(w, h int) (m *H264Encoder) {
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m = &H264Encoder{}
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m.m.w = (C.int)(w)
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m.m.h = (C.int)(h)
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C.h264enc_new(&m.m)
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m.PPS = fromCPtr(unsafe.Pointer(m.m.pps), (int)(m.m.ppslen))
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return
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}
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func (m *H264Encoder) Encode(f *image.YCbCr) (nal []byte) {
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C.x264_picture_init(&m.m.in);
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m.m.in.img.plane[0] = (*C.uint8_t)(unsafe.Pointer(&f.Y[0]));
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m.m.in.img.plane[1] = (*C.uint8_t)(unsafe.Pointer(&f.Cb[0]));
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m.m.in.img.plane[2] = (*C.uint8_t)(unsafe.Pointer(&f.Cr[0]));
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m.m.in.img.i_stride[0] = (C.int)(f.YStride);
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m.m.in.img.i_stride[1] = (C.int)(f.CStride);
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m.m.in.img.i_stride[2] = (C.int)(f.CStride);
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C.h264enc_encode(&m.m)
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nal = make([]byte, m.m.nallen)
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C.h264enc_copy(&m.m, (*C.uint8_t)(unsafe.Pointer(&nal[0])))
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return
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}
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37
codec/util.go
Normal file
37
codec/util.go
Normal file
@ -0,0 +1,37 @@
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/*
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Golang h264,aac decoder/encoder libav wrapper
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*/
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package codec
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import (
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"unsafe"
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"reflect"
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/*
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#cgo darwin LDFLAGS: -lavformat -lavutil -lavcodec -lx264
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#include <libavutil/avutil.h>
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#include <libavformat/avformat.h>
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static void libav_init() {
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av_register_all();
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av_log_set_level(AV_LOG_DEBUG);
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}
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*/
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"C"
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)
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func init() {
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C.libav_init()
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}
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func fromCPtr(buf unsafe.Pointer, size int) (ret []uint8) {
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hdr := (*reflect.SliceHeader)((unsafe.Pointer(&ret)))
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hdr.Cap = size
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hdr.Len = size
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hdr.Data = uintptr(buf)
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return
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}
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