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
|
#define AL_LOG_SECTION "ff_demuxer"
//#define AL_LOG_ENABLE_TRACE
#include <al/log.h>
#include <al/lib.h>
#include "demuxer.h"
#include "avio.h"
static void close_internal(struct camu_ff_demuxer *av)
{
if (av->io_context) {
av_free(av->io_context->buffer);
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 80, 100)
avio_context_free(&av->io_context);
#else
av_free(av->io_context);
av->io_context = NULL;
#endif
}
if (av->format_context) {
avformat_flush(av->format_context);
avformat_close_input(&av->format_context);
// avformat_close_input() should call avformat_free_context().
}
}
static bool ff_demuxer_init(struct camu_demuxer *demux, struct cch_handle *handle)
{
struct camu_ff_demuxer *av = (struct camu_ff_demuxer *)demux;
av->format_context = avformat_alloc_context();
if (!av->format_context) {
log_error("Failed to create format context.");
return false;
}
// This is meant to be the "block size" so, if I understand correctly, that would mean
// the smallest amount for 1 read. Therefore, if reading from memory, it would be a page.
u8 *buf = (u8 *)av_malloc(al_page_size);
av->io_context = avio_alloc_context(buf, al_page_size, 0, handle, camu_avio_read, NULL, camu_avio_seek);
if (!av->io_context) {
log_error("Failed to create custom io context.");
return false;
}
if (!cch_handle_can_seek(handle)) {
// AVIO_SEEKABLE_NORMAL should always be unset if we know we cannot seek.
// However, it should also never be unset if we *do* want to seek because it
// disables long seeks (Not tested in a long time).
// This will also make some resources (e.g. .opus) fail to determine a duration.
av->io_context->seekable &= ~AVIO_SEEKABLE_NORMAL;
} else {
av->io_context->seekable |= AVIO_SEEKABLE_NORMAL;
}
av->format_context->pb = av->io_context;
av->format_context->flags |= AVFMT_FLAG_CUSTOM_IO;
AVDictionary *opts = NULL;
av_dict_set(&opts, "analyzeduration", "10000000", 0);
av_dict_set(&opts, "probesize", "20M", 0);
// FFmpeg says the avio protocol configures "buffers and access patterns".
// I think we already do enough buffering but, better access patterns for
// network streams sounds like something we want.
s32 ret = avformat_open_input(&av->format_context, "cache:", NULL, &opts);
if (ret < 0) {
log_error("Failed to open input (%s).", av_err2str(ret));
av_dict_free(&opts);
return false;
}
av_dict_free(&opts);
ret = avformat_find_stream_info(av->format_context, NULL);
if (ret < 0) {
log_error("Failed to find stream info (%s).", av_err2str(ret));
return false;
}
if (!av->format_context->nb_streams) {
log_error("No streams found.");
return false;
}
s64 default_duration = (av->format_context->duration < 0) ? 0 : av->format_context->duration;
av->duration = 0;
// @TODO:
// - 1 frame .gif.
// - No-duration video. (ex: data/test_resources/no_duration.mkv)
// - Incomplete video files with no duration. .temp.webm.
#define GUESS_STREAM_IS_IMAGE(stream) \
((stream->duration >= 0 && stream->nb_frames <= 1 && \
(stream->avg_frame_rate.den == 0 && stream->r_frame_rate.den > 0)) || \
(stream->duration < 0 && default_duration == 0))
for (u32 i = 0; i < av->format_context->nb_streams; i++) {
AVStream *stream = av->format_context->streams[i];
#ifdef CAMU_OLD_FFMPEG
// This is probably not correct.
if (stream->codecpar->channel_layout == 0) {
stream->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
stream->codecpar->channels = 2;
}
#endif
enum AVMediaType type = stream->codecpar->codec_type;
u64 duration = 0;
u8 mapped_type;
if (type == AVMEDIA_TYPE_AUDIO || type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_SUBTITLE) {
// Try to detect attached images.
if (type == AVMEDIA_TYPE_VIDEO && GUESS_STREAM_IS_IMAGE(stream)) {
log_debug("Assuming stream #%u is an image.", i);
} else {
if (stream->duration < 0) {
stream->duration = av_rescale_q(default_duration, AV_TIME_BASE_Q, stream->time_base);
al_assert(stream->duration >= 0);
log_debug("Stream #%u has an invalid duration, defaulting to %.3fs.",
i, stream->duration * av_q2d(stream->time_base));
}
duration = (u64)av_rescale_q(stream->duration, stream->time_base, AV_TIME_BASE_Q);
if (duration > av->duration) {
av->duration = duration;
}
}
if (stream->start_time == AV_NOPTS_VALUE) {
stream->start_time = 0;
}
mapped_type = type;
} else if (type == AVMEDIA_TYPE_ATTACHMENT) {
mapped_type = CAMU_STREAM_ATTACHMENT;
} else {
// CAMU_STREAM_UNKNOWN(7) is a different value than AVMEDIA_TYPE_UNKNOWN(-1) because
// we don't support negative stream types.
mapped_type = CAMU_STREAM_UNKNOWN;
}
al_array_push(av->demux.streams, ((struct camu_codec_stream){
.mode = CAMU_FFMPEG_COMPAT,
.type = mapped_type,
.duration = duration,
.index = stream->index,
.av.stream = stream
}));
}
#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(60, 30, 100)
av_format_inject_global_side_data(av->format_context);
#endif
#ifdef AL_LOG_ENABLE_TRACE
av_dump_format(av->format_context, 0, "", 0);
#endif
av->eof = false;
return true;
}
static bool subscribed_to_index(struct camu_demuxer *demux, s32 index)
{
return (demux->subscribed >> index) & 1;
}
static s32 ff_demuxer_get_packet(struct camu_demuxer *demux, struct camu_codec_packet *packet)
{
struct camu_ff_demuxer *av = (struct camu_ff_demuxer *)demux;
packet->mode = CAMU_FFMPEG_COMPAT;
AVPacket *pkt = packet->av.pkt;
s32 ret = 0;
for (;;) {
ret = av_read_frame(av->format_context, pkt);
if (ret == AVERROR_EOF) {
av->eof = true;
break;
}
if (ret < 0) {
log_error("Failed to read frame (%s).", av_err2str(ret));
break;
}
if (!subscribed_to_index(demux, pkt->stream_index)) {
av_packet_unref(pkt);
continue;
}
break;
}
return ret;
}
static u64 ff_demuxer_get_duration(struct camu_demuxer *demux)
{
struct camu_ff_demuxer *av = (struct camu_ff_demuxer *)demux;
return av->duration;
}
static bool ff_demuxer_seek(struct camu_demuxer *demux, u64 pos, bool bytes)
{
struct camu_ff_demuxer *av = (struct camu_ff_demuxer *)demux;
// avio_flush() here probably does nothing.
avio_flush(av->io_context);
avformat_flush(av->format_context);
if (av->eof) av->eof = false;
al_assert(pos <= INT64_MAX);
al_assert(!(bytes && av->format_context->flags & AVFMT_NO_BYTE_SEEK));
if (!bytes && pos > av->duration) pos = av->duration;
s64 ts = (s64)pos;
s32 flags = bytes ? AVSEEK_FLAG_BYTE : 0;
s32 ret = avformat_seek_file(av->format_context, -1, INT64_MIN, ts, ts, flags);
if (ret < 0) {
log_error("Failed to seek resource (%s).", av_err2str(ret));
return false;
}
return true;
}
static void ff_demuxer_free(struct camu_demuxer **demux)
{
struct camu_ff_demuxer *av = (struct camu_ff_demuxer *)*demux;
close_internal(av);
al_array_free(av->demux.streams);
al_free(av);
*demux = NULL;
}
struct camu_demuxer *camu_ff_demuxer_create(void)
{
struct camu_ff_demuxer *av = al_alloc_object(struct camu_ff_demuxer);
av->demux.mode = CAMU_FFMPEG_COMPAT;
al_array_init(av->demux.streams);
av->demux.init = ff_demuxer_init;
av->demux.get_packet = ff_demuxer_get_packet;
av->demux.get_duration = ff_demuxer_get_duration;
av->demux.seek = ff_demuxer_seek;
av->demux.free = ff_demuxer_free;
return (struct camu_demuxer *)av;
}
|