summaryrefslogtreecommitdiffstats
path: root/audio/decode/ad_spdif.c
blob: c055715a32e2fb9785007c96f3018a0296080128 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
/*
 * This file is part of MPlayer.
 *
 * Copyright (C) 2012 Naoya OYAMA
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#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;
    AVFormatContext *lavf_ctx;
    int              iec61937_packet_size;
    int              out_buffer_len;
    int              out_buffer_size;
    uint8_t         *out_buffer;
    bool             need_close;
};

static int write_packet(void *p, uint8_t *buf, int buf_size)
{
    struct spdifContext *ctx = p;

    int buffer_left = ctx->out_buffer_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);
    }
}

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;

    AVFormatContext *lavf_ctx  = avformat_alloc_context();
    if (!lavf_ctx)
        goto fail;

    lavf_ctx->oformat = av_guess_format("spdif", NULL, NULL);
    if (!lavf_ctx->oformat)
        goto fail;

    spdif_ctx->lavf_ctx = lavf_ctx;

    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->codec->codec_id = mp_codec_to_av_codec_id(decoder);

    AVDictionary *format_opts = NULL;

    int num_channels = 0;
    int sample_format = 0;
    int samplerate = 0;
    switch (stream->codec->codec_id) {
    case AV_CODEC_ID_AAC:
        spdif_ctx->iec61937_packet_size = 16384;
        sample_format                   = AF_FORMAT_IEC61937_LE;
        samplerate                      = 48000;
        num_channels                    = 2;
        break;
    case AV_CODEC_ID_AC3:
        spdif_ctx->iec61937_packet_size = 6144;
        sample_format                   = AF_FORMAT_AC3_LE;
        samplerate                      = 48000;
        num_channels                    = 2;
        break;
    case AV_CODEC_ID_DTS:
        if (da->opts->dtshd) {
            av_dict_set(&format_opts, "dtshd_rate", "768000", 0); // 4*192000
            spdif_ctx->iec61937_packet_size = 32768;
            sample_format                   = AF_FORMAT_IEC61937_LE;
            samplerate                      = 192000;
            num_channels                    = 2*4;
        } else {
            spdif_ctx->iec61937_packet_size = 32768;
            sample_format                   = AF_FORMAT_AC3_LE;
            samplerate                      = 48000;
            num_channels                    = 2;
        }
        break;
    case AV_CODEC_ID_EAC3:
        spdif_ctx->iec61937_packet_size = 24576;
        sample_format                   = AF_FORMAT_IEC61937_LE;
        samplerate                      = 192000;
        num_channels                    = 2;
        break;
    case AV_CODEC_ID_MP3:
        spdif_ctx->iec61937_packet_size = 4608;
        sample_format                   = AF_FORMAT_MPEG2;
        samplerate                      = 48000;
        num_channels                    = 2;
        break;
    case AV_CODEC_ID_TRUEHD:
        spdif_ctx->iec61937_packet_size = 61440;
        sample_format                   = AF_FORMAT_IEC61937_LE;
        samplerate                      = 192000;
        num_channels                    = 8;
        break;
    default:
        abort();
    }
    mp_audio_set_num_channels(&da->decoded, num_channels);
    mp_audio_set_format(&da->decoded, sample_format);
    da->decoded.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 1;

fail:
    uninit(da);
    return 0;
}

static int decode_audio(struct dec_audio *da, struct mp_audio *buffer, int maxlen)
{
    struct spdifContext *spdif_ctx = da->priv;
    AVFormatContext     *lavf_ctx  = spdif_ctx->lavf_ctx;

    int sstride = 2 * da->decoded.channels.num;
    assert(sstride == buffer->sstride);

    if (maxlen * sstride < spdif_ctx->iec61937_packet_size)
        return 0;

    spdif_ctx->out_buffer_len  = 0;
    spdif_ctx->out_buffer_size = maxlen * sstride;
    spdif_ctx->out_buffer      = buffer->planes[0];

    struct demux_packet *mpkt = demux_read_packet(da->header);
    if (!mpkt)
        return -1;

    AVPacket pkt;
    mp_set_av_packet(&pkt, mpkt, NULL);
    pkt.pts = pkt.dts = 0;
    MP_VERBOSE(da, "spdif packet, size=%d\n", pkt.size);
    if (mpkt->pts != MP_NOPTS_VALUE) {
        da->pts        = mpkt->pts;
        da->pts_offset = 0;
    }
    int ret = av_write_frame(lavf_ctx, &pkt);
    avio_flush(lavf_ctx->pb);
    buffer->samples = spdif_ctx->out_buffer_len / sstride;
    da->pts_offset += buffer->samples;
    talloc_free(mpkt);
    if (ret < 0)
        return -1;

    return 0;
}

static int control(struct dec_audio *da, int cmd, void *arg)
{
    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 void add_decoders(struct mp_decoder_list *list)
{
    for (int n = 0; codecs[n] != AV_CODEC_ID_NONE; n++) {
        const char *format = mp_codec_from_av_codec_id(codecs[n]);
        if (format) {
            mp_add_decoder(list, "spdif", format, format,
                           "libavformat/spdifenc audio pass-through decoder");
        }
    }
}

const struct ad_functions ad_spdif = {
    .name = "spdif",
    .add_decoders = add_decoders,
    .init = init,
    .uninit = uninit,
    .control = control,
    .decode_audio = decode_audio,
};