1/*
2 * FFM (ffserver live feed) muxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavutil/intreadwrite.h"
23#include "libavutil/intfloat.h"
24#include "libavutil/avassert.h"
25#include "libavutil/parseutils.h"
26#include "avformat.h"
27#include "internal.h"
28#include "ffm.h"
29
30static void flush_packet(AVFormatContext *s)
31{
32    FFMContext *ffm = s->priv_data;
33    int fill_size, h;
34    AVIOContext *pb = s->pb;
35
36    fill_size = ffm->packet_end - ffm->packet_ptr;
37    memset(ffm->packet_ptr, 0, fill_size);
38
39    av_assert1(avio_tell(pb) % ffm->packet_size == 0);
40
41    /* put header */
42    avio_wb16(pb, PACKET_ID);
43    avio_wb16(pb, fill_size);
44    avio_wb64(pb, ffm->dts);
45    h = ffm->frame_offset;
46    if (ffm->first_packet)
47        h |= 0x8000;
48    avio_wb16(pb, h);
49    avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
50    avio_flush(pb);
51
52    /* prepare next packet */
53    ffm->frame_offset = 0; /* no key frame */
54    ffm->packet_ptr = ffm->packet;
55    ffm->first_packet = 0;
56}
57
58/* 'first' is true if first data of a frame */
59static void ffm_write_data(AVFormatContext *s,
60                           const uint8_t *buf, int size,
61                           int64_t dts, int header)
62{
63    FFMContext *ffm = s->priv_data;
64    int len;
65
66    if (header && ffm->frame_offset == 0) {
67        ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
68        ffm->dts = dts;
69    }
70
71    /* write as many packets as needed */
72    while (size > 0) {
73        len = ffm->packet_end - ffm->packet_ptr;
74        if (len > size)
75            len = size;
76        memcpy(ffm->packet_ptr, buf, len);
77
78        ffm->packet_ptr += len;
79        buf += len;
80        size -= len;
81        if (ffm->packet_ptr >= ffm->packet_end)
82            flush_packet(s);
83    }
84}
85
86static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
87{
88    uint8_t *dyn_buf;
89    int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
90    avio_wb32(pb, id);
91    avio_wb32(pb, dyn_size);
92    avio_write(pb, dyn_buf, dyn_size);
93    av_free(dyn_buf);
94}
95
96static int ffm_write_header(AVFormatContext *s)
97{
98    FFMContext *ffm = s->priv_data;
99    AVDictionaryEntry *t;
100    AVStream *st;
101    AVIOContext *pb = s->pb;
102    AVCodecContext *codec;
103    int bit_rate, i;
104
105    if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
106        int ret = av_parse_time(&ffm->start_time, t->value, 0);
107        if (ret < 0)
108            return ret;
109    }
110
111    ffm->packet_size = FFM_PACKET_SIZE;
112
113    /* header */
114    avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
115    avio_wb32(pb, ffm->packet_size);
116    avio_wb64(pb, 0); /* current write position */
117
118    if(avio_open_dyn_buf(&pb) < 0)
119        return AVERROR(ENOMEM);
120
121    avio_wb32(pb, s->nb_streams);
122    bit_rate = 0;
123    for(i=0;i<s->nb_streams;i++) {
124        st = s->streams[i];
125        bit_rate += st->codec->bit_rate;
126    }
127    avio_wb32(pb, bit_rate);
128
129    write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
130
131    /* list of streams */
132    for(i=0;i<s->nb_streams;i++) {
133        st = s->streams[i];
134        avpriv_set_pts_info(st, 64, 1, 1000000);
135        if(avio_open_dyn_buf(&pb) < 0)
136            return AVERROR(ENOMEM);
137
138        codec = st->codec;
139        /* generic info */
140        avio_wb32(pb, codec->codec_id);
141        avio_w8(pb, codec->codec_type);
142        avio_wb32(pb, codec->bit_rate);
143        avio_wb32(pb, codec->flags);
144        avio_wb32(pb, codec->flags2);
145        avio_wb32(pb, codec->debug);
146        if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
147            avio_wb32(pb, codec->extradata_size);
148            avio_write(pb, codec->extradata, codec->extradata_size);
149        }
150        write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
151        if(avio_open_dyn_buf(&pb) < 0)
152            return AVERROR(ENOMEM);
153        /* specific info */
154        switch(codec->codec_type) {
155        case AVMEDIA_TYPE_VIDEO:
156            avio_wb32(pb, codec->time_base.num);
157            avio_wb32(pb, codec->time_base.den);
158            avio_wb16(pb, codec->width);
159            avio_wb16(pb, codec->height);
160            avio_wb16(pb, codec->gop_size);
161            avio_wb32(pb, codec->pix_fmt);
162            avio_w8(pb, codec->qmin);
163            avio_w8(pb, codec->qmax);
164            avio_w8(pb, codec->max_qdiff);
165            avio_wb16(pb, (int) (codec->qcompress * 10000.0));
166            avio_wb16(pb, (int) (codec->qblur * 10000.0));
167            avio_wb32(pb, codec->bit_rate_tolerance);
168            avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
169            avio_wb32(pb, codec->rc_max_rate);
170            avio_wb32(pb, codec->rc_min_rate);
171            avio_wb32(pb, codec->rc_buffer_size);
172            avio_wb64(pb, av_double2int(codec->i_quant_factor));
173            avio_wb64(pb, av_double2int(codec->b_quant_factor));
174            avio_wb64(pb, av_double2int(codec->i_quant_offset));
175            avio_wb64(pb, av_double2int(codec->b_quant_offset));
176            avio_wb32(pb, codec->dct_algo);
177            avio_wb32(pb, codec->strict_std_compliance);
178            avio_wb32(pb, codec->max_b_frames);
179            avio_wb32(pb, codec->mpeg_quant);
180            avio_wb32(pb, codec->intra_dc_precision);
181            avio_wb32(pb, codec->me_method);
182            avio_wb32(pb, codec->mb_decision);
183            avio_wb32(pb, codec->nsse_weight);
184            avio_wb32(pb, codec->frame_skip_cmp);
185            avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity));
186            avio_wb32(pb, codec->codec_tag);
187            avio_w8(pb, codec->thread_count);
188            avio_wb32(pb, codec->coder_type);
189            avio_wb32(pb, codec->me_cmp);
190            avio_wb32(pb, codec->me_subpel_quality);
191            avio_wb32(pb, codec->me_range);
192            avio_wb32(pb, codec->keyint_min);
193            avio_wb32(pb, codec->scenechange_threshold);
194            avio_wb32(pb, codec->b_frame_strategy);
195            avio_wb64(pb, av_double2int(codec->qcompress));
196            avio_wb64(pb, av_double2int(codec->qblur));
197            avio_wb32(pb, codec->max_qdiff);
198            avio_wb32(pb, codec->refs);
199            write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'V', 'I'));
200            break;
201        case AVMEDIA_TYPE_AUDIO:
202            avio_wb32(pb, codec->sample_rate);
203            avio_wl16(pb, codec->channels);
204            avio_wl16(pb, codec->frame_size);
205            write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'A', 'U'));
206            break;
207        default:
208            return -1;
209        }
210    }
211    pb = s->pb;
212
213    avio_wb64(pb, 0); // end of header
214
215    /* flush until end of block reached */
216    while ((avio_tell(pb) % ffm->packet_size) != 0)
217        avio_w8(pb, 0);
218
219    avio_flush(pb);
220
221    /* init packet mux */
222    ffm->packet_ptr = ffm->packet;
223    ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
224    av_assert0(ffm->packet_end >= ffm->packet);
225    ffm->frame_offset = 0;
226    ffm->dts = 0;
227    ffm->first_packet = 1;
228
229    return 0;
230}
231
232static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
233{
234    FFMContext *ffm = s->priv_data;
235    int64_t dts;
236    uint8_t header[FRAME_HEADER_SIZE+4];
237    int header_size = FRAME_HEADER_SIZE;
238
239    dts = ffm->start_time + pkt->dts;
240    /* packet size & key_frame */
241    header[0] = pkt->stream_index;
242    header[1] = 0;
243    if (pkt->flags & AV_PKT_FLAG_KEY)
244        header[1] |= FLAG_KEY_FRAME;
245    AV_WB24(header+2, pkt->size);
246    AV_WB24(header+5, pkt->duration);
247    AV_WB64(header+8, ffm->start_time + pkt->pts);
248    if (pkt->pts != pkt->dts) {
249        header[1] |= FLAG_DTS;
250        AV_WB32(header+16, pkt->pts - pkt->dts);
251        header_size += 4;
252    }
253    ffm_write_data(s, header, header_size, dts, 1);
254    ffm_write_data(s, pkt->data, pkt->size, dts, 0);
255
256    return 0;
257}
258
259static int ffm_write_trailer(AVFormatContext *s)
260{
261    FFMContext *ffm = s->priv_data;
262
263    /* flush packets */
264    if (ffm->packet_ptr > ffm->packet)
265        flush_packet(s);
266
267    return 0;
268}
269
270AVOutputFormat ff_ffm_muxer = {
271    .name              = "ffm",
272    .long_name         = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
273    .extensions        = "ffm",
274    .priv_data_size    = sizeof(FFMContext),
275    .audio_codec       = AV_CODEC_ID_MP2,
276    .video_codec       = AV_CODEC_ID_MPEG1VIDEO,
277    .write_header      = ffm_write_header,
278    .write_packet      = ffm_write_packet,
279    .write_trailer     = ffm_write_trailer,
280    .flags             = AVFMT_TS_NEGATIVE,
281};
282