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296 lines
7.8 KiB
296 lines
7.8 KiB
#include "decoder.h"
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/audio_fifo.h>
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#include <libavutil/channel_layout.h>
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#include <glib.h>
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#include <stdint.h>
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#include <libavresample/avresample.h>
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#include <libavutil/opt.h>
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#include "types.h"
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#include "log.h"
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#include "str.h"
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#include "output.h"
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struct decoder_s {
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// format params
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int channels;
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int in_clockrate;
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int out_clockrate;
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AVAudioResampleContext *avresample;
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AVFrame *swr_frame;
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int swr_buffers;
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AVCodecContext *avcctx;
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AVPacket avpkt;
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AVFrame *frame;
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unsigned long rtp_ts;
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uint64_t pts;
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};
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struct decoder_def_s {
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const char *rtpname;
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int clockrate_mult;
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int avcodec_id;
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const char *avcodec_name;
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};
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#define DECODER_DEF_MULT_NAME(ref, id, mult, name) { \
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.rtpname = #ref, \
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.avcodec_id = AV_CODEC_ID_ ## id, \
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.clockrate_mult = mult, \
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.avcodec_name = #name, \
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}
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#define DECODER_DEF_MULT(ref, id, mult) DECODER_DEF_MULT_NAME(ref, id, mult, NULL)
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#define DECODER_DEF_NAME(ref, id, name) DECODER_DEF_MULT_NAME(ref, id, 1, name)
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#define DECODER_DEF(ref, id) DECODER_DEF_MULT(ref, id, 1)
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static const struct decoder_def_s decoders[] = {
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DECODER_DEF(PCMA, PCM_ALAW),
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DECODER_DEF(PCMU, PCM_MULAW),
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DECODER_DEF(G723, G723_1),
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DECODER_DEF_MULT(G722, ADPCM_G722, 2),
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DECODER_DEF(QCELP, QCELP),
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DECODER_DEF(G729, G729),
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DECODER_DEF(speex, SPEEX),
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DECODER_DEF(GSM, GSM),
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DECODER_DEF(iLBC, ILBC),
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DECODER_DEF_NAME(opus, OPUS, libopus),
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DECODER_DEF_NAME(vorbis, VORBIS, libvorbis),
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DECODER_DEF(ac3, AC3),
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DECODER_DEF(eac3, EAC3),
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DECODER_DEF(ATRAC3, ATRAC3),
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DECODER_DEF(ATRAC-X, ATRAC3P),
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#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 0, 0)
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DECODER_DEF(EVRC, EVRC),
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DECODER_DEF(EVRC0, EVRC),
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DECODER_DEF(EVRC1, EVRC),
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#endif
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DECODER_DEF(AMR, AMR_NB),
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DECODER_DEF(AMR-WB, AMR_WB),
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};
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typedef struct decoder_def_s decoder_def_t;
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int resample_audio;
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static const decoder_def_t *decoder_find(const str *name) {
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for (int i = 0; i < G_N_ELEMENTS(decoders); i++) {
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if (!str_cmp(name, decoders[i].rtpname))
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return &decoders[i];
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}
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return NULL;
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}
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decoder_t *decoder_new(const char *payload_str) {
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const char *err = NULL;
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str name;
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char *slash = strchr(payload_str, '/');
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if (!slash) {
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ilog(LOG_WARN, "Invalid payload format: %s", payload_str);
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return NULL;
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}
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str_init_len(&name, (char *) payload_str, slash - payload_str);
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int clockrate = atoi(slash + 1);
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int channels = 1;
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slash = strchr(slash + 1, '/');
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if (slash) {
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channels = atoi(slash + 1);
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if (!channels)
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channels = 1;
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}
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const decoder_def_t *def = decoder_find(&name);
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if (!def) {
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ilog(LOG_WARN, "No decoder for payload %s", payload_str);
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return NULL;
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}
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clockrate *= def->clockrate_mult;
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decoder_t *ret = g_slice_alloc0(sizeof(*ret));
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ret->channels = channels;
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ret->in_clockrate = clockrate;
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ret->out_clockrate = resample_audio ? : clockrate;
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AVCodec *codec = NULL;
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if (def->avcodec_name)
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codec = avcodec_find_decoder_by_name(def->avcodec_name);
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if (!codec)
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codec = avcodec_find_decoder(def->avcodec_id);
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if (!codec) {
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ilog(LOG_WARN, "Codec '%s' not supported", def->rtpname);
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goto err;
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}
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ret->avcctx = avcodec_alloc_context3(codec);
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err = "failed to alloc codec context";
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if (!ret->avcctx)
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goto err;
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ret->avcctx->channels = channels;
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ret->avcctx->sample_rate = clockrate;
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err = "failed to open codec context";
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int i = avcodec_open2(ret->avcctx, codec, NULL);
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if (i)
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goto err;
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av_init_packet(&ret->avpkt);
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ret->frame = av_frame_alloc();
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err = "failed to alloc av frame";
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if (!ret->frame)
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goto err;
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ret->pts = (uint64_t) -1LL;
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ret->rtp_ts = (unsigned long) -1L;
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return ret;
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err:
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decoder_close(ret);
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if (err)
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ilog(LOG_ERR, "Error creating media decoder: %s", err);
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return NULL;
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}
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int decoder_input(decoder_t *dec, const str *data, unsigned long ts, output_t *output) {
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const char *err;
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if (G_UNLIKELY(!dec))
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return -1;
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dbg("%p dec pts %lu rtp_ts %lu incoming ts %lu", dec, (unsigned long) dec->pts,
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(unsigned long) dec->rtp_ts, (unsigned long) ts);
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if (G_UNLIKELY(dec->rtp_ts == (unsigned long) -1L)) {
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// initialize pts
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dec->pts = 0;
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}
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else {
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// shift pts according to rtp ts shift
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dec->pts += (ts - dec->rtp_ts) /* * output->avst->time_base.num * 8000 / output->avst->time_base.den */ ;
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// XXX handle lost packets here if timestamps don't line up?
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}
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dec->rtp_ts = ts;
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dec->avpkt.data = (unsigned char *) data->s;
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dec->avpkt.size = data->len;
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dec->avpkt.pts = dec->pts;
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#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 0, 0)
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int ret = avcodec_send_packet(dec->avcctx, &dec->avpkt);
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dbg("send packet ret %i", ret);
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err = "failed to send packet to avcodec";
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if (ret)
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goto err;
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ret = avcodec_receive_frame(dec->avcctx, dec->frame);
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dbg("receive frame ret %i", ret);
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err = "failed to receive frame from avcodec";
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if (ret)
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goto err;
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#else
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int got_frame = 0;
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int ret = avcodec_decode_audio4(dec->avcctx, dec->frame, &got_frame, &dec->avpkt);
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dbg("decode frame ret %i, got frame %i", ret, got_frame);
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err = "failed to decode audio packet";
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if (ret < 0)
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goto err;
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if (!got_frame)
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return 0;
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#endif
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dbg("%p dec frame pts %lu pkt_pts %lu", dec, (unsigned long) dec->frame->pts,
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(unsigned long) dec->frame->pkt_dts);
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// do we need to resample?
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AVFrame *dec_frame = dec->frame;
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if (dec->in_clockrate != dec->out_clockrate) {
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if (!dec->avresample) {
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dec->avresample = avresample_alloc_context();
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err = "failed to alloc resample context";
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if (!dec->avresample)
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goto err;
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av_opt_set_int(dec->avresample, "in_channel_layout", av_get_default_channel_layout(dec->channels), 0);
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av_opt_set_int(dec->avresample, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
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av_opt_set_int(dec->avresample, "in_sample_rate", dec->in_clockrate, 0);
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av_opt_set_int(dec->avresample, "out_channel_layout", av_get_default_channel_layout(dec->channels), 0);
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av_opt_set_int(dec->avresample, "out_sample_fmt", AV_SAMPLE_FMT_S16, 0);
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av_opt_set_int(dec->avresample, "out_sample_rate", dec->out_clockrate, 0);
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// av_opt_set_int(dec->avresample, "internal_sample_fmt", AV_SAMPLE_FMT_FLTP, 0); // ?
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err = "failed to init resample context";
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if (avresample_open(dec->avresample) < 0)
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goto err;
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}
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// get a large enough buffer for resampled audio
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int dst_samples = av_rescale_rnd(dec->frame->nb_samples, dec->out_clockrate,
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dec->in_clockrate, AV_ROUND_UP);
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if (!dec->swr_frame || dec->swr_buffers < dst_samples) {
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av_frame_free(&dec->swr_frame);
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dec->swr_frame = av_frame_alloc();
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err = "failed to alloc resampling frame";
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if (!dec->swr_frame)
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goto err;
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av_frame_copy_props(dec->swr_frame, dec->frame);
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dec->swr_frame->format = dec->frame->format;
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dec->swr_frame->channel_layout = dec->frame->channel_layout;
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dec->swr_frame->nb_samples = dst_samples;
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dec->swr_frame->sample_rate = dec->out_clockrate;
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err = "failed to get resample buffers";
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if (av_frame_get_buffer(dec->swr_frame, 0) < 0)
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goto err;
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dec->swr_buffers = dst_samples;
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}
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dec->swr_frame->nb_samples = dst_samples;
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int ret_samples = avresample_convert(dec->avresample, dec->swr_frame->extended_data,
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dec->swr_frame->linesize[0], dst_samples,
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dec->frame->extended_data,
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dec->frame->linesize[0], dec->frame->nb_samples);
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err = "failed to resample audio";
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if (ret_samples < 0)
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goto err;
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dec_frame = dec->swr_frame;
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dec_frame->nb_samples = ret_samples;
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dec_frame->pts = av_rescale(dec->frame->pts, dec->out_clockrate, dec->in_clockrate);
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}
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output_config(output, dec->out_clockrate, dec->channels);
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if (output_add(output, dec_frame))
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return -1;
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return 0;
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err:
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ilog(LOG_ERR, "Error decoding media packet: %s", err);
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return -1;
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}
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void decoder_close(decoder_t *dec) {
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if (!dec)
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return;
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/// XXX drain inputs and outputs
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avcodec_free_context(&dec->avcctx);
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av_frame_free(&dec->frame);
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av_frame_free(&dec->swr_frame);
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avresample_free(&dec->avresample);
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g_slice_free1(sizeof(*dec), dec);
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}
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