FFmpeg: libavformat/tta.c Source File
Go to the documentation of this file. 1 /*
2 * TTA demuxer
3 * Copyright (c) 2006 Alex Beregszaszi
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
25
32
38
40 {
47 return 0;
48 }
49
51 {
56
58
62
65
69 if(samplerate <= 0 || samplerate > 1000000){
72 }
73
75 if (!nb_samples) {
78 }
79
84 }
85
86 c->frame_size = samplerate * 256 / 245;
87 c->last_frame_size = nb_samples %
c->frame_size;
88 if (!
c->last_frame_size)
89 c->last_frame_size =
c->frame_size;
90 c->totalframes = nb_samples /
c->frame_size + (
c->last_frame_size <
c->frame_size);
92
93 if(
c->totalframes >= (INT_MAX - 4)/
sizeof(uint32_t) ||
c->totalframes <= 0){
96 }
97
99 if (!st)
101
105
110
112 if (framepos < 0)
113 return framepos;
114 framepos += 4 *
c->totalframes + 4;
115
117 for (
int i = 0;
i <
c->totalframes;
i++) {
126 }
131 }
132
138
143 }
144
145 return 0;
146 }
147
149 {
154
155 // FIXME!
156 if (
c->currentframe >=
c->totalframes)
158
162 }
163
165
168 pkt->
duration =
c->currentframe ==
c->totalframes ?
c->last_frame_size :
171 }
172
174 {
179 return -1;
181 return -1;
182
184
185 return 0;
186 }
187
191 .p.extensions = "tta",
198 };
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
enum AVMediaType codec_type
General type of the encoded data.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
#define FF_INFMT_FLAG_ID3V2_AUTO
Automatically parse ID3v2 metadata.
void ff_id3v1_read(AVFormatContext *s)
Read an ID3v1 tag.
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
int nb_channels
Number of channels in this layout.
unsigned long ffio_get_checksum(AVIOContext *s)
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
int64_t duration
Decoding: duration of the stream, in stream time base.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
This structure contains the data a format has to probe a file.
AVChannelLayout ch_layout
Audio only.
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int sample_rate
Audio only.
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
void ffio_init_checksum(AVIOContext *s, unsigned long(*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum)
static const uint8_t header[24]
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
static int read_header(FFV1Context *f, RangeCoder *c)
#define i(width, name, range_min, range_max)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
IDirect3DDxgiInterfaceAccess _COM_Outptr_ void ** p
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
static int read_probe(const AVProbeData *p)
int bits_per_coded_sample
The number of bits per sample in the codedwords.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define MKTAG(a, b, c, d)
int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
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