FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* copyright (c) 2001 Fabrice Bellard
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#ifndef AVFORMAT_DEMUX_H
22			#define AVFORMAT_DEMUX_H
23
24			#include <stdint.h>
25			#include "libavutil/rational.h"
26			#include "libavcodec/packet.h"
27			#include "avformat.h"
28
29			struct AVDeviceInfoList;
30
31			/**
32			* For an FFInputFormat with this flag set read_close() needs to be called
33			* by the caller upon read_header() failure.
34			*/
35			#define FF_INFMT_FLAG_INIT_CLEANUP (1 << 0)
36
37			/*
38			* Prefer the codec framerate for avg_frame_rate computation.
39			*/
40			#define FF_INFMT_FLAG_PREFER_CODEC_FRAMERATE (1 << 1)
41
42			/**
43			* Automatically parse ID3v2 metadata
44			*/
45			#define FF_INFMT_FLAG_ID3V2_AUTO (1 << 2)
46
47			typedef struct FFInputFormat {
48			/**
49			* The public AVInputFormat. See avformat.h for it.
50			*/
51			AVInputFormat p;
52
53			/**
54			* Raw demuxers store their codec ID here.
55			*/
56			enum AVCodecID raw_codec_id;
57
58			/**
59			* Size of private data so that it can be allocated in the wrapper.
60			*/
61			int priv_data_size;
62
63			/**
64			* Internal flags. See FF_INFMT_FLAG_* above and FF_FMT_FLAG_* in internal.h.
65			*/
66			int flags_internal;
67
68			/**
69			* Tell if a given file has a chance of being parsed as this format.
70			* The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
71			* big so you do not have to check for that unless you need more.
72			*/
73			int (*read_probe)(const AVProbeData *);
74
75			/**
76			* Read the format header and initialize the AVFormatContext
77			* structure. Return 0 if OK. 'avformat_new_stream' should be
78			* called to create new streams.
79			*/
80			int (*read_header)(struct AVFormatContext *);
81
82			/**
83			* Read one packet and put it in 'pkt'. pts and flags are also
84			* set. 'avformat_new_stream' can be called only if the flag
85			* AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
86			* background thread).
87			* @return 0 on success, < 0 on error.
88			* Upon returning an error, pkt must be unreferenced by the caller.
89			*/
90			int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
91
92			/**
93			* Close the stream. The AVFormatContext and AVStreams are not
94			* freed by this function
95			*/
96			int (*read_close)(struct AVFormatContext *);
97
98			/**
99			* Seek to a given timestamp relative to the frames in
100			* stream component stream_index.
101			* @param stream_index Must not be -1.
102			* @param flags Selects which direction should be preferred if no exact
103			* match is available.
104			* @return >= 0 on success (but not necessarily the new offset)
105			*/
106			int (*read_seek)(struct AVFormatContext *,
107			int stream_index, int64_t timestamp, int flags);
108
109			/**
110			* Get the next timestamp in stream[stream_index].time_base units.
111			* @return the timestamp or AV_NOPTS_VALUE if an error occurred
112			*/
113			int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
114			int64_t *pos, int64_t pos_limit);
115
116			/**
117			* Start/resume playing - only meaningful if using a network-based format
118			* (RTSP).
119			*/
120			int (*read_play)(struct AVFormatContext *);
121
122			/**
123			* Pause playing - only meaningful if using a network-based format
124			* (RTSP).
125			*/
126			int (*read_pause)(struct AVFormatContext *);
127
128			/**
129			* Seek to timestamp ts.
130			* Seeking will be done so that the point from which all active streams
131			* can be presented successfully will be closest to ts and within min/max_ts.
132			* Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
133			*/
134			int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
135
136			/**
137			* Returns device list with it properties.
138			* @see avdevice_list_devices() for more details.
139			*/
140			int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
141			} FFInputFormat;
142
143		6147968	static inline const FFInputFormat *ffifmt(const AVInputFormat *fmt)
144			{
145		6147968	return (const FFInputFormat*)fmt;
146			}
147
148			#define MAX_STD_TIMEBASES (30*12+30+3+6)
149			typedef struct FFStreamInfo {
150			int64_t last_dts;
151			int64_t duration_gcd;
152			int duration_count;
153			int64_t rfps_duration_sum;
154			double (*duration_error)[2][MAX_STD_TIMEBASES];
155			int64_t codec_info_duration;
156			int64_t codec_info_duration_fields;
157			int frame_delay_evidence;
158
159			/**
160			* 0 -> decoder has not been searched for yet.
161			* >0 -> decoder found
162			* <0 -> decoder with codec_id == -found_decoder has not been found
163			*/
164			int found_decoder;
165
166			int64_t last_duration;
167
168			/**
169			* Those are used for average framerate estimation.
170			*/
171			int64_t fps_first_dts;
172			int fps_first_dts_idx;
173			int64_t fps_last_dts;
174			int fps_last_dts_idx;
175			} FFStreamInfo;
176
177			/**
178			* Returned by demuxers to indicate that data was consumed but discarded
179			* (ignored streams or junk data). The framework will re-call the demuxer.
180			*/
181			#define FFERROR_REDO FFERRTAG('R','E','D','O')
182
183			/**
184			* Read a transport packet from a media file.
185			*
186			* @param s media file handle
187			* @param pkt is filled
188			* @return 0 if OK, AVERROR_xxx on error
189			*/
190			int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
191
192			void ff_read_frame_flush(AVFormatContext *s);
193
194			/**
195			* Perform a binary search using av_index_search_timestamp() and
196			* FFInputFormat.read_timestamp().
197			*
198			* @param target_ts target timestamp in the time base of the given stream
199			* @param stream_index stream number
200			*/
201			int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
202			int64_t target_ts, int flags);
203
204			/**
205			* Update cur_dts of all streams based on the given timestamp and AVStream.
206			*
207			* Stream ref_st unchanged, others set cur_dts in their native time base.
208			* Only needed for timestamp wrapping or if (dts not set and pts!=dts).
209			* @param timestamp new dts expressed in time_base of param ref_st
210			* @param ref_st reference stream giving time_base of param timestamp
211			*/
212			void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
213
214			int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
215			int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
216
217			/**
218			* Perform a binary search using read_timestamp().
219			*
220			* @param target_ts target timestamp in the time base of the given stream
221			* @param stream_index stream number
222			*/
223			int64_t ff_gen_search(AVFormatContext *s, int stream_index,
224			int64_t target_ts, int64_t pos_min,
225			int64_t pos_max, int64_t pos_limit,
226			int64_t ts_min, int64_t ts_max,
227			int flags, int64_t *ts_ret,
228			int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
229
230			/**
231			* Internal version of av_index_search_timestamp
232			*/
233			int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
234			int64_t wanted_timestamp, int flags);
235
236			/**
237			* Internal version of av_add_index_entry
238			*/
239			int ff_add_index_entry(AVIndexEntry **index_entries,
240			int *nb_index_entries,
241			unsigned int *index_entries_allocated_size,
242			int64_t pos, int64_t timestamp, int size, int distance, int flags);
243
244			void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
245
246			/**
247			* Ensure the index uses less memory than the maximum specified in
248			* AVFormatContext.max_index_size by discarding entries if it grows
249			* too large.
250			*/
251			void ff_reduce_index(AVFormatContext *s, int stream_index);
252
253			/**
254			* add frame for rfps calculation.
255			*
256			* @param dts timestamp of the i-th frame
257			* @return 0 if OK, AVERROR_xxx on error
258			*/
259			int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
260
261			void ff_rfps_calculate(AVFormatContext *ic);
262
263			/**
264			* Rescales a timestamp and the endpoints of an interval to which the temstamp
265			* belongs, from a timebase `tb_in` to a timebase `tb_out`.
266			*
267			* The upper (lower) bound of the output interval is rounded up (down) such that
268			* the output interval always falls within the input interval. The timestamp is
269			* rounded to the nearest integer and halfway cases away from zero, and can
270			* therefore fall outside of the output interval.
271			*
272			* Useful to simplify the rescaling of the arguments of FFInputFormat::read_seek2()
273			*
274			* @param[in] tb_in Timebase of the input `min_ts`, `ts` and `max_ts`
275			* @param[in] tb_out Timebase of the output `min_ts`, `ts` and `max_ts`
276			* @param[in,out] min_ts Lower bound of the interval
277			* @param[in,out] ts Timestamp
278			* @param[in,out] max_ts Upper bound of the interval
279			*/
280			void ff_rescale_interval(AVRational tb_in, AVRational tb_out,
281			int64_t *min_ts, int64_t *ts, int64_t *max_ts);
282
283			void avpriv_stream_set_need_parsing(AVStream *st, enum AVStreamParseType type);
284
285			/**
286			* Add a new chapter.
287			*
288			* @param s media file handle
289			* @param id unique ID for this chapter
290			* @param start chapter start time in time_base units
291			* @param end chapter end time in time_base units
292			* @param title chapter title
293			*
294			* @return AVChapter or NULL on error
295			*/
296			AVChapter *avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base,
297			int64_t start, int64_t end, const char *title);
298
299			/**
300			* Add an attached pic to an AVStream.
301			*
302			* @param st if set, the stream to add the attached pic to;
303			* if unset, a new stream will be added to s.
304			* @param pb AVIOContext to read data from if buf is unset.
305			* @param buf if set, it contains the data and size information to be used
306			* for the attached pic; if unset, data is read from pb.
307			* @param size the size of the data to read if buf is unset.
308			*
309			* @return 0 on success, < 0 on error. On error, this function removes
310			* the stream it has added (if any).
311			*/
312			int ff_add_attached_pic(AVFormatContext *s, AVStream *st, AVIOContext *pb,
313			AVBufferRef **buf, int size);
314
315			/**
316			* Add side data to a packet for changing parameters to the given values.
317			* Parameters set to 0 aren't included in the change.
318			*/
319			int ff_add_param_change(AVPacket *pkt, int32_t channels,
320			uint64_t channel_layout, int32_t sample_rate,
321			int32_t width, int32_t height);
322
323			/**
324			* Generate standard extradata for AVC-Intra based on width/height and field
325			* order.
326			*/
327			int ff_generate_avci_extradata(AVStream *st);
328
329			/**
330			* Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
331			* which is always set to 0 and fill it from pb.
332			*
333			* @param size size of extradata
334			* @return >= 0 if OK, AVERROR_xxx on error
335			*/
336			int ff_get_extradata(void *logctx, AVCodecParameters *par, AVIOContext *pb, int size);
337
338			/**
339			* Find stream index based on format-specific stream ID
340			* @return stream index, or < 0 on error
341			*/
342			int ff_find_stream_index(const AVFormatContext *s, int id);
343
344			int ff_buffer_packet(AVFormatContext *s, AVPacket *pkt);
345
346			#endif /* AVFORMAT_DEMUX_H */
347