1/*
2 * NUT (de)muxing via libnut
3 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * NUT demuxing and muxing via libnut.
25 * @author Oded Shimon <ods15@ods15.dyndns.org>
26 */
27
28#include "avformat.h"
29#include "internal.h"
30#include "riff.h"
31#include <libnut.h>
32
33#define ID_STRING "nut/multimedia container"
34#define ID_LENGTH (strlen(ID_STRING) + 1)
35
36typedef struct {
37    nut_context_tt * nut;
38    nut_stream_header_tt * s;
39} NUTContext;
40
41static const AVCodecTag nut_tags[] = {
42    { CODEC_ID_MPEG4,  MKTAG('m', 'p', '4', 'v') },
43    { CODEC_ID_MP3,    MKTAG('m', 'p', '3', ' ') },
44    { CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
45    { 0, 0 },
46};
47
48#if CONFIG_LIBNUT_MUXER
49static int av_write(void * h, size_t len, const uint8_t * buf) {
50    AVIOContext * bc = h;
51    avio_write(bc, buf, len);
52    //avio_flush(bc);
53    return len;
54}
55
56static int nut_write_header(AVFormatContext * avf) {
57    NUTContext * priv = avf->priv_data;
58    AVIOContext * bc = avf->pb;
59    nut_muxer_opts_tt mopts = {
60        .output = {
61            .priv = bc,
62            .write = av_write,
63        },
64        .alloc = { av_malloc, av_realloc, av_free },
65        .write_index = 1,
66        .realtime_stream = 0,
67        .max_distance = 32768,
68        .fti = NULL,
69    };
70    nut_stream_header_tt * s;
71    int i;
72
73    priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s);
74
75    for (i = 0; i < avf->nb_streams; i++) {
76        AVCodecContext * codec = avf->streams[i]->codec;
77        int j;
78        int fourcc = 0;
79        int num, denom, ssize;
80
81        s[i].type = codec->codec_type == AVMEDIA_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
82
83        if (codec->codec_tag) fourcc = codec->codec_tag;
84        else fourcc = ff_codec_get_tag(nut_tags, codec->codec_id);
85
86        if (!fourcc) {
87            if (codec->codec_type == AVMEDIA_TYPE_VIDEO) fourcc = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
88            if (codec->codec_type == AVMEDIA_TYPE_AUDIO) fourcc = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
89        }
90
91        s[i].fourcc_len = 4;
92        s[i].fourcc = av_malloc(s[i].fourcc_len);
93        for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
94
95        ff_parse_specific_params(codec, &num, &ssize, &denom);
96        avpriv_set_pts_info(avf->streams[i], 60, denom, num);
97
98        s[i].time_base.num = denom;
99        s[i].time_base.den = num;
100
101        s[i].fixed_fps = 0;
102        s[i].decode_delay = codec->has_b_frames;
103        s[i].codec_specific_len = codec->extradata_size;
104        s[i].codec_specific = codec->extradata;
105
106        if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
107            s[i].width = codec->width;
108            s[i].height = codec->height;
109            s[i].sample_width = 0;
110            s[i].sample_height = 0;
111            s[i].colorspace_type = 0;
112        } else {
113            s[i].samplerate_num = codec->sample_rate;
114            s[i].samplerate_denom = 1;
115            s[i].channel_count = codec->channels;
116        }
117    }
118
119    s[avf->nb_streams].type = -1;
120    priv->nut = nut_muxer_init(&mopts, s, NULL);
121
122    return 0;
123}
124
125static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
126    NUTContext * priv = avf->priv_data;
127    nut_packet_tt p;
128
129    p.len = pkt->size;
130    p.stream = pkt->stream_index;
131    p.pts = pkt->pts;
132    p.flags = pkt->flags & AV_PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
133    p.next_pts = 0;
134
135    nut_write_frame_reorder(priv->nut, &p, pkt->data);
136
137    return 0;
138}
139
140static int nut_write_trailer(AVFormatContext * avf) {
141    AVIOContext * bc = avf->pb;
142    NUTContext * priv = avf->priv_data;
143    int i;
144
145    nut_muxer_uninit_reorder(priv->nut);
146    avio_flush(bc);
147
148    for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
149    av_freep(&priv->s);
150
151    return 0;
152}
153
154AVOutputFormat ff_libnut_muxer = {
155    .name              = "libnut",
156    .long_name         = "nut format",
157    .mime_type         = "video/x-nut",
158    .extensions        = "nut",
159    .priv_data_size    = sizeof(NUTContext),
160    .audio_codec       = CODEC_ID_VORBIS,
161    .video_codec       = CODEC_ID_MPEG4,
162    .write_header      = nut_write_header,
163    .write_packet      = nut_write_packet,
164    .write_trailer     = nut_write_trailer,
165    .flags = AVFMT_GLOBALHEADER,
166};
167#endif /* CONFIG_LIBNUT_MUXER */
168
169static int nut_probe(AVProbeData *p) {
170    if (!memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
171
172    return 0;
173}
174
175static size_t av_read(void * h, size_t len, uint8_t * buf) {
176    AVIOContext * bc = h;
177    return avio_read(bc, buf, len);
178}
179
180static off_t av_seek(void * h, long long pos, int whence) {
181    AVIOContext * bc = h;
182    if (whence == SEEK_END) {
183        pos = avio_size(bc) + pos;
184        whence = SEEK_SET;
185    }
186    return avio_seek(bc, pos, whence);
187}
188
189static int nut_read_header(AVFormatContext * avf, AVFormatParameters * ap) {
190    NUTContext * priv = avf->priv_data;
191    AVIOContext * bc = avf->pb;
192    nut_demuxer_opts_tt dopts = {
193        .input = {
194            .priv = bc,
195            .seek = av_seek,
196            .read = av_read,
197            .eof = NULL,
198            .file_pos = 0,
199        },
200        .alloc = { av_malloc, av_realloc, av_free },
201        .read_index = 1,
202        .cache_syncpoints = 1,
203    };
204    nut_context_tt * nut = priv->nut = nut_demuxer_init(&dopts);
205    nut_stream_header_tt * s;
206    int ret, i;
207
208    if ((ret = nut_read_headers(nut, &s, NULL))) {
209        av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
210        nut_demuxer_uninit(nut);
211        return -1;
212    }
213
214    priv->s = s;
215
216    for (i = 0; s[i].type != -1 && i < 2; i++) {
217        AVStream * st = avformat_new_stream(avf, NULL);
218        int j;
219
220        for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8);
221
222        st->codec->has_b_frames = s[i].decode_delay;
223
224        st->codec->extradata_size = s[i].codec_specific_len;
225        if (st->codec->extradata_size) {
226            st->codec->extradata = av_mallocz(st->codec->extradata_size);
227            memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
228        }
229
230        avpriv_set_pts_info(avf->streams[i], 60, s[i].time_base.num, s[i].time_base.den);
231        st->start_time = 0;
232        st->duration = s[i].max_pts;
233
234        st->codec->codec_id = ff_codec_get_id(nut_tags, st->codec->codec_tag);
235
236        switch(s[i].type) {
237        case NUT_AUDIO_CLASS:
238            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
239            if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, st->codec->codec_tag);
240
241            st->codec->channels = s[i].channel_count;
242            st->codec->sample_rate = s[i].samplerate_num / s[i].samplerate_denom;
243            break;
244        case NUT_VIDEO_CLASS:
245            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
246            if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
247
248            st->codec->width = s[i].width;
249            st->codec->height = s[i].height;
250            st->sample_aspect_ratio.num = s[i].sample_width;
251            st->sample_aspect_ratio.den = s[i].sample_height;
252            break;
253        }
254        if (st->codec->codec_id == CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
255    }
256
257    return 0;
258}
259
260static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
261    NUTContext * priv = avf->priv_data;
262    nut_packet_tt pd;
263    int ret;
264
265    ret = nut_read_next_packet(priv->nut, &pd);
266
267    if (ret || av_new_packet(pkt, pd.len) < 0) {
268        if (ret != NUT_ERR_EOF)
269            av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(ret));
270        return -1;
271    }
272
273    if (pd.flags & NUT_FLAG_KEY) pkt->flags |= AV_PKT_FLAG_KEY;
274    pkt->pts = pd.pts;
275    pkt->stream_index = pd.stream;
276    pkt->pos = avio_tell(avf->pb);
277
278    ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
279
280    return ret;
281}
282
283static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
284    NUTContext * priv = avf->priv_data;
285    int active_streams[] = { stream_index, -1 };
286    double time_pos = target_ts * priv->s[stream_index].time_base.num / (double)priv->s[stream_index].time_base.den;
287
288    if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
289
290    return 0;
291}
292
293static int nut_read_close(AVFormatContext *s) {
294    NUTContext * priv = s->priv_data;
295
296    nut_demuxer_uninit(priv->nut);
297
298    return 0;
299}
300
301AVInputFormat ff_libnut_demuxer = {
302    .name           = "libnut",
303    .long_name      = NULL_IF_CONFIG_SMALL("NUT format"),
304    .priv_data_size = sizeof(NUTContext),
305    .read_probe     = nut_probe,
306    .read_header    = nut_read_header,
307    .read_packet    = nut_read_packet,
308    .read_close     = nut_read_close,
309    .read_seek      = nut_read_seek,
310    .extensions = "nut",
311};
312