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 "avformat.h"
24#include "ffm.h"
25
26static void flush_packet(AVFormatContext *s)
27{
28    FFMContext *ffm = s->priv_data;
29    int fill_size, h;
30    ByteIOContext *pb = s->pb;
31
32    fill_size = ffm->packet_end - ffm->packet_ptr;
33    memset(ffm->packet_ptr, 0, fill_size);
34
35    if (url_ftell(pb) % ffm->packet_size)
36        av_abort();
37
38    /* put header */
39    put_be16(pb, PACKET_ID);
40    put_be16(pb, fill_size);
41    put_be64(pb, ffm->dts);
42    h = ffm->frame_offset;
43    if (ffm->first_packet)
44        h |= 0x8000;
45    put_be16(pb, h);
46    put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet);
47    put_flush_packet(pb);
48
49    /* prepare next packet */
50    ffm->frame_offset = 0; /* no key frame */
51    ffm->packet_ptr = ffm->packet;
52    ffm->first_packet = 0;
53}
54
55/* 'first' is true if first data of a frame */
56static void ffm_write_data(AVFormatContext *s,
57                           const uint8_t *buf, int size,
58                           int64_t dts, int header)
59{
60    FFMContext *ffm = s->priv_data;
61    int len;
62
63    if (header && ffm->frame_offset == 0) {
64        ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
65        ffm->dts = dts;
66    }
67
68    /* write as many packets as needed */
69    while (size > 0) {
70        len = ffm->packet_end - ffm->packet_ptr;
71        if (len > size)
72            len = size;
73        memcpy(ffm->packet_ptr, buf, len);
74
75        ffm->packet_ptr += len;
76        buf += len;
77        size -= len;
78        if (ffm->packet_ptr >= ffm->packet_end)
79            flush_packet(s);
80    }
81}
82
83static int ffm_write_header(AVFormatContext *s)
84{
85    FFMContext *ffm = s->priv_data;
86    AVStream *st;
87    ByteIOContext *pb = s->pb;
88    AVCodecContext *codec;
89    int bit_rate, i;
90
91    ffm->packet_size = FFM_PACKET_SIZE;
92
93    /* header */
94    put_le32(pb, MKTAG('F', 'F', 'M', '1'));
95    put_be32(pb, ffm->packet_size);
96    put_be64(pb, 0); /* current write position */
97
98    put_be32(pb, s->nb_streams);
99    bit_rate = 0;
100    for(i=0;i<s->nb_streams;i++) {
101        st = s->streams[i];
102        bit_rate += st->codec->bit_rate;
103    }
104    put_be32(pb, bit_rate);
105
106    /* list of streams */
107    for(i=0;i<s->nb_streams;i++) {
108        st = s->streams[i];
109        av_set_pts_info(st, 64, 1, 1000000);
110
111        codec = st->codec;
112        /* generic info */
113        put_be32(pb, codec->codec_id);
114        put_byte(pb, codec->codec_type);
115        put_be32(pb, codec->bit_rate);
116        put_be32(pb, st->quality);
117        put_be32(pb, codec->flags);
118        put_be32(pb, codec->flags2);
119        put_be32(pb, codec->debug);
120        /* specific info */
121        switch(codec->codec_type) {
122        case AVMEDIA_TYPE_VIDEO:
123            put_be32(pb, codec->time_base.num);
124            put_be32(pb, codec->time_base.den);
125            put_be16(pb, codec->width);
126            put_be16(pb, codec->height);
127            put_be16(pb, codec->gop_size);
128            put_be32(pb, codec->pix_fmt);
129            put_byte(pb, codec->qmin);
130            put_byte(pb, codec->qmax);
131            put_byte(pb, codec->max_qdiff);
132            put_be16(pb, (int) (codec->qcompress * 10000.0));
133            put_be16(pb, (int) (codec->qblur * 10000.0));
134            put_be32(pb, codec->bit_rate_tolerance);
135            put_strz(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
136            put_be32(pb, codec->rc_max_rate);
137            put_be32(pb, codec->rc_min_rate);
138            put_be32(pb, codec->rc_buffer_size);
139            put_be64(pb, av_dbl2int(codec->i_quant_factor));
140            put_be64(pb, av_dbl2int(codec->b_quant_factor));
141            put_be64(pb, av_dbl2int(codec->i_quant_offset));
142            put_be64(pb, av_dbl2int(codec->b_quant_offset));
143            put_be32(pb, codec->dct_algo);
144            put_be32(pb, codec->strict_std_compliance);
145            put_be32(pb, codec->max_b_frames);
146            put_be32(pb, codec->luma_elim_threshold);
147            put_be32(pb, codec->chroma_elim_threshold);
148            put_be32(pb, codec->mpeg_quant);
149            put_be32(pb, codec->intra_dc_precision);
150            put_be32(pb, codec->me_method);
151            put_be32(pb, codec->mb_decision);
152            put_be32(pb, codec->nsse_weight);
153            put_be32(pb, codec->frame_skip_cmp);
154            put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
155            put_be32(pb, codec->codec_tag);
156            put_byte(pb, codec->thread_count);
157            put_be32(pb, codec->coder_type);
158            put_be32(pb, codec->me_cmp);
159            put_be32(pb, codec->partitions);
160            put_be32(pb, codec->me_subpel_quality);
161            put_be32(pb, codec->me_range);
162            put_be32(pb, codec->keyint_min);
163            put_be32(pb, codec->scenechange_threshold);
164            put_be32(pb, codec->b_frame_strategy);
165            put_be64(pb, av_dbl2int(codec->qcompress));
166            put_be64(pb, av_dbl2int(codec->qblur));
167            put_be32(pb, codec->max_qdiff);
168            put_be32(pb, codec->refs);
169            put_be32(pb, codec->directpred);
170            break;
171        case AVMEDIA_TYPE_AUDIO:
172            put_be32(pb, codec->sample_rate);
173            put_le16(pb, codec->channels);
174            put_le16(pb, codec->frame_size);
175            put_le16(pb, codec->sample_fmt);
176            break;
177        default:
178            return -1;
179        }
180        if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
181            put_be32(pb, codec->extradata_size);
182            put_buffer(pb, codec->extradata, codec->extradata_size);
183        }
184    }
185
186    /* flush until end of block reached */
187    while ((url_ftell(pb) % ffm->packet_size) != 0)
188        put_byte(pb, 0);
189
190    put_flush_packet(pb);
191
192    /* init packet mux */
193    ffm->packet_ptr = ffm->packet;
194    ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
195    assert(ffm->packet_end >= ffm->packet);
196    ffm->frame_offset = 0;
197    ffm->dts = 0;
198    ffm->first_packet = 1;
199
200    return 0;
201}
202
203static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
204{
205    int64_t dts;
206    uint8_t header[FRAME_HEADER_SIZE+4];
207    int header_size = FRAME_HEADER_SIZE;
208
209    dts = s->timestamp + pkt->dts;
210    /* packet size & key_frame */
211    header[0] = pkt->stream_index;
212    header[1] = 0;
213    if (pkt->flags & AV_PKT_FLAG_KEY)
214        header[1] |= FLAG_KEY_FRAME;
215    AV_WB24(header+2, pkt->size);
216    AV_WB24(header+5, pkt->duration);
217    AV_WB64(header+8, s->timestamp + pkt->pts);
218    if (pkt->pts != pkt->dts) {
219        header[1] |= FLAG_DTS;
220        AV_WB32(header+16, pkt->pts - pkt->dts);
221        header_size += 4;
222    }
223    ffm_write_data(s, header, header_size, dts, 1);
224    ffm_write_data(s, pkt->data, pkt->size, dts, 0);
225
226    return 0;
227}
228
229static int ffm_write_trailer(AVFormatContext *s)
230{
231    ByteIOContext *pb = s->pb;
232    FFMContext *ffm = s->priv_data;
233
234    /* flush packets */
235    if (ffm->packet_ptr > ffm->packet)
236        flush_packet(s);
237
238    put_flush_packet(pb);
239
240    return 0;
241}
242
243AVOutputFormat ffm_muxer = {
244    "ffm",
245    NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
246    "",
247    "ffm",
248    sizeof(FFMContext),
249    /* not really used */
250    CODEC_ID_MP2,
251    CODEC_ID_MPEG1VIDEO,
252    ffm_write_header,
253    ffm_write_packet,
254    ffm_write_trailer,
255};
256