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mpv/audio/decode/ad_spdif.c

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/*
* Copyright (C) 2012 Naoya OYAMA
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <assert.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavutil/opt.h>
#include "config.h"
#include "common/msg.h"
#include "common/av_common.h"
#include "options/options.h"
#include "ad.h"
#define OUTBUF_SIZE 65536
struct spdifContext {
struct mp_log *log;
enum AVCodecID codec_id;
AVFormatContext *lavf_ctx;
int out_buffer_len;
uint8_t out_buffer[OUTBUF_SIZE];
bool need_close;
bool use_dts_hd;
struct mp_audio fmt;
struct mp_audio_pool *pool;
bool got_eof;
struct demux_packet *queued_packet;
};
static int write_packet(void *p, uint8_t *buf, int buf_size)
{
struct spdifContext *ctx = p;
int buffer_left = OUTBUF_SIZE - ctx->out_buffer_len;
if (buf_size > buffer_left) {
MP_ERR(ctx, "spdif packet too large.\n");
buf_size = buffer_left;
}
memcpy(&ctx->out_buffer[ctx->out_buffer_len], buf, buf_size);
ctx->out_buffer_len += buf_size;
return buf_size;
}
static void uninit(struct dec_audio *da)
{
struct spdifContext *spdif_ctx = da->priv;
AVFormatContext *lavf_ctx = spdif_ctx->lavf_ctx;
if (lavf_ctx) {
if (spdif_ctx->need_close)
av_write_trailer(lavf_ctx);
if (lavf_ctx->pb)
av_freep(&lavf_ctx->pb->buffer);
av_freep(&lavf_ctx->pb);
avformat_free_context(lavf_ctx);
talloc_free(spdif_ctx->queued_packet);
spdif_ctx->lavf_ctx = NULL;
}
}
static int init(struct dec_audio *da, const char *decoder)
{
struct spdifContext *spdif_ctx = talloc_zero(NULL, struct spdifContext);
da->priv = spdif_ctx;
spdif_ctx->log = da->log;
spdif_ctx->use_dts_hd = da->opts->dtshd;
spdif_ctx->pool = mp_audio_pool_create(spdif_ctx);
if (strcmp(decoder, "spdif_dts_hd") == 0)
spdif_ctx->use_dts_hd = true;
spdif_ctx->codec_id = mp_codec_to_av_codec_id(da->codec->codec);
return spdif_ctx->codec_id != AV_CODEC_ID_NONE;
}
static void determine_codec_params(struct dec_audio *da, AVPacket *pkt,
int *out_profile, int *out_rate)
{
struct spdifContext *spdif_ctx = da->priv;
int profile = FF_PROFILE_UNKNOWN;
AVCodecContext *ctx = NULL;
AVFrame *frame = NULL;
AVCodecParserContext *parser = av_parser_init(spdif_ctx->codec_id);
if (parser) {
// Don't make it wait for the next frame.
parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
ctx = avcodec_alloc_context3(NULL);
uint8_t *d = NULL;
int s = 0;
av_parser_parse2(parser, ctx, &d, &s, pkt->data, pkt->size, 0, 0, 0);
*out_profile = profile = ctx->profile;
*out_rate = ctx->sample_rate;
av_free(ctx);
av_parser_close(parser);
}
if (profile != FF_PROFILE_UNKNOWN || spdif_ctx->codec_id != AV_CODEC_ID_DTS)
return;
AVCodec *codec = avcodec_find_decoder(spdif_ctx->codec_id);
if (!codec)
goto done;
frame = av_frame_alloc();
if (!frame)
goto done;
ctx = avcodec_alloc_context3(codec);
if (!ctx)
goto done;
if (avcodec_open2(ctx, codec, NULL) < 0) {
av_free(ctx); // don't attempt to avcodec_close() an unopened ctx
ctx = NULL;
goto done;
}
if (avcodec_send_packet(ctx, pkt) < 0)
goto done;
if (avcodec_receive_frame(ctx, frame) < 0)
goto done;
*out_profile = profile = ctx->profile;
*out_rate = ctx->sample_rate;
done:
av_frame_free(&frame);
if (ctx)
avcodec_close(ctx);
avcodec_free_context(&ctx);
if (profile == FF_PROFILE_UNKNOWN)
MP_WARN(da, "Failed to parse codec profile.\n");
}
static int init_filter(struct dec_audio *da, AVPacket *pkt)
{
struct spdifContext *spdif_ctx = da->priv;
int profile = FF_PROFILE_UNKNOWN;
int c_rate = 0;
determine_codec_params(da, pkt, &profile, &c_rate);
MP_VERBOSE(da, "In: profile=%d samplerate=%d\n", profile, c_rate);
AVFormatContext *lavf_ctx = avformat_alloc_context();
if (!lavf_ctx)
goto fail;
spdif_ctx->lavf_ctx = lavf_ctx;
lavf_ctx->oformat = av_guess_format("spdif", NULL, NULL);
if (!lavf_ctx->oformat)
goto fail;
void *buffer = av_mallocz(OUTBUF_SIZE);
if (!buffer)
abort();
lavf_ctx->pb = avio_alloc_context(buffer, OUTBUF_SIZE, 1, spdif_ctx, NULL,
write_packet, NULL);
if (!lavf_ctx->pb) {
av_free(buffer);
goto fail;
}
// Request minimal buffering (not available on Libav)
#if LIBAVFORMAT_VERSION_MICRO >= 100
lavf_ctx->pb->direct = 1;
#endif
AVStream *stream = avformat_new_stream(lavf_ctx, 0);
if (!stream)
goto fail;
stream->codecpar->codec_id = spdif_ctx->codec_id;
AVDictionary *format_opts = NULL;
int num_channels = 0;
int sample_format = 0;
int samplerate = 0;
switch (spdif_ctx->codec_id) {
case AV_CODEC_ID_AAC:
sample_format = AF_FORMAT_S_AAC;
samplerate = 48000;
num_channels = 2;
break;
case AV_CODEC_ID_AC3:
sample_format = AF_FORMAT_S_AC3;
samplerate = c_rate > 0 ? c_rate : 48000;
num_channels = 2;
break;
case AV_CODEC_ID_DTS: {
bool is_hd = profile == FF_PROFILE_DTS_HD_HRA ||
profile == FF_PROFILE_DTS_HD_MA ||
profile == FF_PROFILE_UNKNOWN;
if (spdif_ctx->use_dts_hd && is_hd) {
av_dict_set(&format_opts, "dtshd_rate", "768000", 0); // 4*192000
sample_format = AF_FORMAT_S_DTSHD;
samplerate = 192000;
num_channels = 2*4;
} else {
sample_format = AF_FORMAT_S_DTS;
samplerate = 48000;
num_channels = 2;
}
break;
}
case AV_CODEC_ID_EAC3:
sample_format = AF_FORMAT_S_EAC3;
samplerate = 192000;
num_channels = 2;
break;
case AV_CODEC_ID_MP3:
sample_format = AF_FORMAT_S_MP3;
samplerate = 48000;
num_channels = 2;
break;
case AV_CODEC_ID_TRUEHD:
sample_format = AF_FORMAT_S_TRUEHD;
samplerate = 192000;
num_channels = 8;
break;
default:
abort();
}
mp_audio_set_num_channels(&spdif_ctx->fmt, num_channels);
mp_audio_set_format(&spdif_ctx->fmt, sample_format);
spdif_ctx->fmt.rate = samplerate;
if (avformat_write_header(lavf_ctx, &format_opts) < 0) {
MP_FATAL(da, "libavformat spdif initialization failed.\n");
av_dict_free(&format_opts);
goto fail;
}
av_dict_free(&format_opts);
spdif_ctx->need_close = true;
return 0;
fail:
uninit(da);
return -1;
}
static bool send_packet(struct dec_audio *da, struct demux_packet *mpkt)
{
struct spdifContext *spdif_ctx = da->priv;
if (spdif_ctx->queued_packet || spdif_ctx->got_eof)
return false;
spdif_ctx->queued_packet = mpkt ? demux_copy_packet(mpkt) : NULL;
spdif_ctx->got_eof = !mpkt;
return true;
}
static bool receive_frame(struct dec_audio *da, struct mp_audio **out)
{
struct spdifContext *spdif_ctx = da->priv;
if (spdif_ctx->got_eof) {
spdif_ctx->got_eof = false;
return false;
}
if (!spdif_ctx->queued_packet)
return true;
double pts = spdif_ctx->queued_packet->pts;
AVPacket pkt;
mp_set_av_packet(&pkt, spdif_ctx->queued_packet, NULL);
pkt.pts = pkt.dts = 0;
if (!spdif_ctx->lavf_ctx) {
if (init_filter(da, &pkt) < 0)
goto done;
}
spdif_ctx->out_buffer_len = 0;
int ret = av_write_frame(spdif_ctx->lavf_ctx, &pkt);
avio_flush(spdif_ctx->lavf_ctx->pb);
if (ret < 0) {
MP_ERR(da, "spdif mux error: '%s'\n", mp_strerror(AVUNERROR(ret)));
goto done;
}
int samples = spdif_ctx->out_buffer_len / spdif_ctx->fmt.sstride;
*out = mp_audio_pool_get(spdif_ctx->pool, &spdif_ctx->fmt, samples);
if (!*out)
goto done;
memcpy((*out)->planes[0], spdif_ctx->out_buffer, spdif_ctx->out_buffer_len);
(*out)->pts = pts;
done:
talloc_free(spdif_ctx->queued_packet);
spdif_ctx->queued_packet = NULL;
return true;
}
static int control(struct dec_audio *da, int cmd, void *arg)
{
struct spdifContext *spdif_ctx = da->priv;
switch (cmd) {
case ADCTRL_RESET:
talloc_free(spdif_ctx->queued_packet);
spdif_ctx->queued_packet = NULL;
spdif_ctx->got_eof = false;
return CONTROL_TRUE;
}
return CONTROL_UNKNOWN;
}
static const int codecs[] = {
AV_CODEC_ID_AAC,
AV_CODEC_ID_AC3,
AV_CODEC_ID_DTS,
AV_CODEC_ID_EAC3,
AV_CODEC_ID_MP3,
AV_CODEC_ID_TRUEHD,
AV_CODEC_ID_NONE
};
static bool find_codec(const char *name)
{
for (int n = 0; codecs[n] != AV_CODEC_ID_NONE; n++) {
const char *format = mp_codec_from_av_codec_id(codecs[n]);
if (format && name && strcmp(format, name) == 0)
return true;
}
return false;
}
// codec is the libavcodec name of the source audio codec.
// pref is a ","-separated list of names, some of them which do not match with
// libavcodec names (like dts-hd).
struct mp_decoder_list *select_spdif_codec(const char *codec, const char *pref)
{
struct mp_decoder_list *list = talloc_zero(NULL, struct mp_decoder_list);
if (!find_codec(codec))
return list;
bool spdif_allowed = false, dts_hd_allowed = false;
bstr sel = bstr0(pref);
while (sel.len) {
bstr decoder;
bstr_split_tok(sel, ",", &decoder, &sel);
if (decoder.len) {
if (bstr_equals0(decoder, codec))
spdif_allowed = true;
if (bstr_equals0(decoder, "dts-hd") && strcmp(codec, "dts") == 0)
spdif_allowed = dts_hd_allowed = true;
}
}
if (!spdif_allowed)
return list;
const char *suffix_name = dts_hd_allowed ? "dts_hd" : codec;
char name[80];
snprintf(name, sizeof(name), "spdif_%s", suffix_name);
mp_add_decoder(list, "spdif", codec, name,
"libavformat/spdifenc audio pass-through decoder");
return list;
}
const struct ad_functions ad_spdif = {
.name = "spdif",
.add_decoders = NULL,
.init = init,
.uninit = uninit,
.control = control,
.send_packet = send_packet,
.receive_frame = receive_frame,
};
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