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ffmpeg/libav/utils.c

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/*
* Various utilities for ffmpeg system
* Copyright (c) 2000,2001 Gerard Lantau
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>
#include "avformat.h"
AVFormat *first_format;
void register_avformat(AVFormat *format)
{
AVFormat **p;
p = &first_format;
while (*p != NULL) p = &(*p)->next;
*p = format;
format->next = NULL;
}
int match_ext(const char *filename, const char *extensions)
{
const char *ext, *p;
char ext1[32], *q;
ext = strrchr(filename, '.');
if (ext) {
ext++;
p = extensions;
for(;;) {
q = ext1;
while (*p != '\0' && *p != ',')
*q++ = *p++;
*q = '\0';
if (!strcasecmp(ext1, ext))
return 1;
if (*p == '\0')
break;
p++;
}
}
return 0;
}
AVFormat *guess_format(const char *short_name, const char *filename, const char *mime_type)
{
AVFormat *fmt, *fmt_found;
int score_max, score;
/* find the proper file type */
fmt_found = NULL;
score_max = 0;
fmt = first_format;
while (fmt != NULL) {
score = 0;
if (fmt->name && short_name && !strcmp(fmt->name, short_name))
score += 100;
if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
score += 10;
if (filename && fmt->extensions &&
match_ext(filename, fmt->extensions)) {
score += 5;
}
if (score > score_max) {
score_max = score;
fmt_found = fmt;
}
fmt = fmt->next;
}
return fmt_found;
}
/* return TRUE if val is a prefix of str. If it returns TRUE, ptr is
set to the next character in 'str' after the prefix */
int strstart(const char *str, const char *val, const char **ptr)
{
const char *p, *q;
p = str;
q = val;
while (*q != '\0') {
if (*p != *q)
return 0;
p++;
q++;
}
if (ptr)
*ptr = p;
return 1;
}
void nstrcpy(char *buf, int buf_size, const char *str)
{
int c;
char *q = buf;
for(;;) {
c = *str++;
if (c == 0 || q >= buf + buf_size - 1)
break;
*q++ = c;
}
*q = '\0';
}
void register_all(void)
{
avcodec_init();
avcodec_register_all();
register_avformat(&mp2_format);
register_avformat(&ac3_format);
register_avformat(&mpeg_mux_format);
register_avformat(&mpeg1video_format);
register_avformat(&h263_format);
register_avformat(&rm_format);
register_avformat(&asf_format);
register_avformat(&avi_format);
register_avformat(&mpjpeg_format);
register_avformat(&jpeg_format);
register_avformat(&swf_format);
register_avformat(&wav_format);
register_avformat(&pcm_format);
register_avformat(&rawvideo_format);
register_avformat(&ffm_format);
register_avformat(&pgm_format);
register_avformat(&pgmyuv_format);
register_avformat(&imgyuv_format);
register_avformat(&pgmpipe_format);
register_protocol(&file_protocol);
register_protocol(&pipe_protocol);
register_protocol(&audio_protocol);
register_protocol(&video_protocol);
register_protocol(&udp_protocol);
register_protocol(&http_protocol);
}
/* memory handling */
int av_new_packet(AVPacket *pkt, int size)
{
pkt->data = malloc(size);
if (!pkt->data)
return -ENOMEM;
pkt->size = size;
/* sane state */
pkt->pts = 0;
pkt->stream_index = 0;
pkt->flags = 0;
return 0;
}
void av_free_packet(AVPacket *pkt)
{
free(pkt->data);
/* fail safe */
pkt->data = NULL;
pkt->size = 0;
}
/* fifo handling */
int fifo_init(FifoBuffer *f, int size)
{
f->buffer = malloc(size);
if (!f->buffer)
return -1;
f->end = f->buffer + size;
f->wptr = f->rptr = f->buffer;
return 0;
}
void fifo_free(FifoBuffer *f)
{
free(f->buffer);
}
int fifo_size(FifoBuffer *f, UINT8 *rptr)
{
int size;
if (f->wptr >= rptr) {
size = f->wptr - rptr;
} else {
size = (f->end - rptr) + (f->wptr - f->buffer);
}
return size;
}
/* get data from the fifo (return -1 if not enough data) */
int fifo_read(FifoBuffer *f, UINT8 *buf, int buf_size, UINT8 **rptr_ptr)
{
UINT8 *rptr = *rptr_ptr;
int size, len;
if (f->wptr >= rptr) {
size = f->wptr - rptr;
} else {
size = (f->end - rptr) + (f->wptr - f->buffer);
}
if (size < buf_size)
return -1;
while (buf_size > 0) {
len = f->end - rptr;
if (len > buf_size)
len = buf_size;
memcpy(buf, rptr, len);
buf += len;
rptr += len;
if (rptr >= f->end)
rptr = f->buffer;
buf_size -= len;
}
*rptr_ptr = rptr;
return 0;
}
void fifo_write(FifoBuffer *f, UINT8 *buf, int size, UINT8 **wptr_ptr)
{
int len;
UINT8 *wptr;
wptr = *wptr_ptr;
while (size > 0) {
len = f->end - wptr;
if (len > size)
len = size;
memcpy(wptr, buf, len);
wptr += len;
if (wptr >= f->end)
wptr = f->buffer;
buf += len;
size -= len;
}
*wptr_ptr = wptr;
}
/* media file handling */
AVFormatContext *av_open_input_file(const char *filename, int buf_size)
{
AVFormatParameters params, *ap;
AVFormat *fmt;
AVFormatContext *ic = NULL;
URLFormat url_format;
int err;
ic = av_mallocz(sizeof(AVFormatContext));
if (!ic)
goto fail;
if (url_fopen(&ic->pb, filename, URL_RDONLY) < 0)
goto fail;
if (buf_size > 0) {
url_setbufsize(&ic->pb, buf_size);
}
/* find format */
err = url_getformat(url_fileno(&ic->pb), &url_format);
if (err >= 0) {
fmt = guess_format(url_format.format_name, NULL, NULL);
ap = &params;
ap->sample_rate = url_format.sample_rate;
ap->frame_rate = url_format.frame_rate;
ap->channels = url_format.channels;
ap->width = url_format.width;
ap->height = url_format.height;
ap->pix_fmt = url_format.pix_fmt;
} else {
fmt = guess_format(NULL, filename, NULL);
ap = NULL;
}
if (!fmt || !fmt->read_header) {
return NULL;
}
ic->format = fmt;
err = ic->format->read_header(ic, ap);
if (err < 0) {
url_fclose(&ic->pb);
goto fail;
}
return ic;
fail:
if (ic)
free(ic);
return NULL;
}
int av_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVPacketList *pktl;
pktl = s->packet_buffer;
if (pktl) {
/* read packet from packet buffer, if there is data */
*pkt = pktl->pkt;
s->packet_buffer = pktl->next;
free(pktl);
return 0;
} else {
return s->format->read_packet(s, pkt);
}
}
void av_close_input_file(AVFormatContext *s)
{
int i;
if (s->format->read_close)
s->format->read_close(s);
for(i=0;i<s->nb_streams;i++) {
free(s->streams[i]);
}
if (s->packet_buffer) {
AVPacketList *p, *p1;
p = s->packet_buffer;
while (p != NULL) {
p1 = p->next;
av_free_packet(&p->pkt);
free(p);
p = p1;
}
s->packet_buffer = NULL;
}
url_fclose(&s->pb);
free(s);
}
int av_write_packet(AVFormatContext *s, AVPacket *pkt)
{
/* XXX: currently, an emulation because internal API must change */
return s->format->write_packet(s, pkt->stream_index, pkt->data, pkt->size);
}
/* "user interface" functions */
void dump_format(AVFormatContext *ic,
int index,
const char *url,
int is_output)
{
int i;
char buf[256];
fprintf(stderr, "%s #%d, %s, %s '%s':\n",
is_output ? "Output" : "Input",
index, ic->format->name,
is_output ? "to" : "from", url);
for(i=0;i<ic->nb_streams;i++) {
AVStream *st = ic->streams[i];
avcodec_string(buf, sizeof(buf), &st->codec, is_output);
fprintf(stderr, " Stream #%d.%d: %s\n", index, i, buf);
}
}
typedef struct {
const char *str;
int width, height;
} SizeEntry;
static SizeEntry sizes[] = {
{ "sqcif", 128, 96 },
{ "qcif", 176, 144 },
{ "cif", 352, 288 },
{ "4cif", 704, 576 },
};
int parse_image_size(int *width_ptr, int *height_ptr, const char *str)
{
int i;
int n = sizeof(sizes) / sizeof(SizeEntry);
const char *p;
int frame_width = 0, frame_height = 0;
for(i=0;i<n;i++) {
if (!strcmp(sizes[i].str, str)) {
frame_width = sizes[i].width;
frame_height = sizes[i].height;
break;
}
}
if (i == n) {
p = str;
frame_width = strtol(p, (char **)&p, 10);
if (*p)
p++;
frame_height = strtol(p, (char **)&p, 10);
}
if (frame_width <= 0 || frame_height <= 0)
return -1;
*width_ptr = frame_width;
*height_ptr = frame_height;
return 0;
}
INT64 gettime(void)
{
struct timeval tv;
gettimeofday(&tv,NULL);
return (INT64)tv.tv_sec * 1000000 + tv.tv_usec;
}
/* syntax: [YYYY-MM-DD ][[HH:]MM:]SS[.m...] . Return the date in micro seconds since 1970 */
INT64 parse_date(const char *datestr, int duration)
{
const char *p;
INT64 t;
int sec;
p = datestr;
if (!duration) {
static const UINT8 months[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int year, month, day, i;
if (strlen(p) >= 5 && p[4] == '-') {
year = strtol(p, (char **)&p, 10);
if (*p)
p++;
month = strtol(p, (char **)&p, 10) - 1;
if (*p)
p++;
day = strtol(p, (char **)&p, 10) - 1;
if (*p)
p++;
day += (year - 1970) * 365;
/* if >= March, take February of current year into account too */
if (month >= 2)
year++;
for(i=1970;i<year;i++) {
if ((i % 100) == 0) {
if ((i % 400) == 0) day++;
} else if ((i % 4) == 0) {
day++;
}
}
for(i=0;i<month;i++)
day += months[i];
} else {
day = (time(NULL) / (3600 * 24));
}
t = day * (3600 * 24);
} else {
t = 0;
}
sec = 0;
for(;;) {
int val;
val = strtol(p, (char **)&p, 10);
sec = sec * 60 + val;
if (*p != ':')
break;
p++;
}
t = (t + sec) * 1000000;
if (*p == '.') {
int val, n;
p++;
n = strlen(p);
if (n > 6)
n = 6;
val = strtol(p, NULL, 10);
while (n < 6) {
val = val * 10;
n++;
}
t += val;
}
return t;
}
/* syntax: '?tag1=val1&tag2=val2...'. No URL decoding is done. Return
1 if found */
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
{
const char *p;
char tag[128], *q;
p = info;
if (*p == '?')
p++;
for(;;) {
q = tag;
while (*p != '\0' && *p != '=' && *p != '&') {
if ((q - tag) < sizeof(tag) - 1)
*q++ = *p;
p++;
}
*q = '\0';
q = arg;
if (*p == '=') {
p++;
while (*p != '&' && *p != '\0') {
if ((q - arg) < arg_size - 1)
*q++ = *p;
p++;
}
*q = '\0';
}
if (!strcmp(tag, tag1))
return 1;
if (*p != '&')
break;
}
return 0;
}
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