cd223e0b |
/*
* Apple HTTP Live Streaming demuxer
* Copyright (c) 2010 Martin Storsjo
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Apple HTTP Live Streaming demuxer
* http://tools.ietf.org/html/draft-pantos-http-live-streaming
*/
#include "libavutil/avstring.h" |
84465f21 |
#include "libavutil/intreadwrite.h" |
0ebcdf5c |
#include "libavutil/mathematics.h" |
84465f21 |
#include "libavutil/opt.h" |
d2d67e42 |
#include "libavutil/dict.h" |
896bb0d7 |
#include "libavutil/time.h" |
cd223e0b |
#include "avformat.h"
#include "internal.h" |
6cc7f139 |
#include "avio_internal.h" |
5cec8971 |
#include "url.h" |
6cc7f139 |
#define INITIAL_BUFFER_SIZE 32768 |
cd223e0b |
/*
* An apple http stream consists of a playlist with media segment files,
* played sequentially. There may be several playlists with the same
* video content, in different bandwidth variants, that are played in |
b22ecbc6 |
* parallel (preferably only one bandwidth variant at a time). In this case, |
cd223e0b |
* the user supplied the url to a main playlist that only lists the variant
* playlists.
*
* If the main playlist doesn't point at any variants, we still create
* one anonymous toplevel variant for this, to maintain the structure.
*/
|
84465f21 |
enum KeyType {
KEY_NONE,
KEY_AES_128,
};
|
cd223e0b |
struct segment { |
c4419103 |
int64_t duration; |
cd223e0b |
char url[MAX_URL_SIZE]; |
84465f21 |
char key[MAX_URL_SIZE];
enum KeyType key_type;
uint8_t iv[16]; |
cd223e0b |
};
/* |
9371d70b |
* Each playlist has its own demuxer. If it currently is active, |
471fe57e |
* it has an open AVIOContext too, and potentially an AVPacket |
cd223e0b |
* containing the next packet from this stream.
*/ |
9371d70b |
struct playlist { |
cd223e0b |
char url[MAX_URL_SIZE]; |
6cc7f139 |
AVIOContext pb;
uint8_t* read_buffer;
URLContext *input;
AVFormatContext *parent;
int index; |
cd223e0b |
AVFormatContext *ctx;
AVPacket pkt;
int stream_offset;
|
d3964da2 |
int finished; |
c4419103 |
int64_t target_duration; |
cd223e0b |
int start_seq_no;
int n_segments;
struct segment **segments; |
6cc7f139 |
int needed, cur_needed;
int cur_seq_no;
int64_t last_load_time; |
84465f21 |
char key_url[MAX_URL_SIZE];
uint8_t key[16]; |
cd223e0b |
};
|
9371d70b |
struct variant {
int bandwidth;
int n_playlists;
struct playlist **playlists;
};
|
65cd7bf3 |
typedef struct HLSContext { |
cd223e0b |
int n_variants;
struct variant **variants; |
9371d70b |
int n_playlists;
struct playlist **playlists;
|
cd223e0b |
int cur_seq_no; |
6cc7f139 |
int end_of_segment;
int first_packet; |
6f20921d |
int64_t first_timestamp; |
811de351 |
int64_t seek_timestamp;
int seek_flags; |
9957cdbf |
AVIOInterruptCB *interrupt_callback; |
d4e5d8d4 |
char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context |
4684539c |
char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context |
65cd7bf3 |
} HLSContext; |
cd223e0b |
|
471fe57e |
static int read_chomp_line(AVIOContext *s, char *buf, int maxlen) |
cd223e0b |
{
int len = ff_get_line(s, buf, maxlen); |
88d55b82 |
while (len > 0 && av_isspace(buf[len - 1])) |
cd223e0b |
buf[--len] = '\0';
return len;
}
|
9371d70b |
static void free_segment_list(struct playlist *pls) |
cd223e0b |
{
int i; |
9371d70b |
for (i = 0; i < pls->n_segments; i++)
av_free(pls->segments[i]);
av_freep(&pls->segments);
pls->n_segments = 0;
}
static void free_playlist_list(HLSContext *c)
{
int i;
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
free_segment_list(pls);
av_free_packet(&pls->pkt);
av_free(pls->pb.buffer);
if (pls->input)
ffurl_close(pls->input);
if (pls->ctx) {
pls->ctx->pb = NULL;
avformat_close_input(&pls->ctx);
}
av_free(pls);
}
av_freep(&c->playlists);
av_freep(&c->cookies);
av_freep(&c->user_agent);
c->n_playlists = 0; |
cd223e0b |
}
|
65cd7bf3 |
static void free_variant_list(HLSContext *c) |
cd223e0b |
{
int i;
for (i = 0; i < c->n_variants; i++) {
struct variant *var = c->variants[i]; |
9371d70b |
av_freep(&var->playlists); |
cd223e0b |
av_free(var);
}
av_freep(&c->variants);
c->n_variants = 0;
}
/*
* Used to reset a statically allocated AVPacket to a clean slate,
* containing no data.
*/
static void reset_packet(AVPacket *pkt)
{
av_init_packet(pkt);
pkt->data = NULL;
}
|
9371d70b |
static struct playlist *new_playlist(HLSContext *c, const char *url,
const char *base)
{
struct playlist *pls = av_mallocz(sizeof(struct playlist));
if (!pls)
return NULL;
reset_packet(&pls->pkt);
ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
dynarray_add(&c->playlists, &c->n_playlists, pls);
return pls;
}
|
65cd7bf3 |
static struct variant *new_variant(HLSContext *c, int bandwidth, |
cd223e0b |
const char *url, const char *base)
{ |
9371d70b |
struct variant *var;
struct playlist *pls;
pls = new_playlist(c, url, base);
if (!pls)
return NULL;
var = av_mallocz(sizeof(struct variant)); |
cd223e0b |
if (!var)
return NULL; |
9371d70b |
|
cd223e0b |
var->bandwidth = bandwidth;
dynarray_add(&c->variants, &c->n_variants, var); |
9371d70b |
dynarray_add(&var->playlists, &var->n_playlists, pls); |
cd223e0b |
return var;
}
struct variant_info {
char bandwidth[20];
};
static void handle_variant_args(struct variant_info *info, const char *key,
int key_len, char **dest, int *dest_len)
{ |
1a172ce6 |
if (!strncmp(key, "BANDWIDTH=", key_len)) { |
cd223e0b |
*dest = info->bandwidth;
*dest_len = sizeof(info->bandwidth);
}
}
|
84465f21 |
struct key_info {
char uri[MAX_URL_SIZE];
char method[10];
char iv[35];
};
static void handle_key_args(struct key_info *info, const char *key,
int key_len, char **dest, int *dest_len)
{
if (!strncmp(key, "METHOD=", key_len)) {
*dest = info->method;
*dest_len = sizeof(info->method);
} else if (!strncmp(key, "URI=", key_len)) {
*dest = info->uri;
*dest_len = sizeof(info->uri);
} else if (!strncmp(key, "IV=", key_len)) {
*dest = info->iv;
*dest_len = sizeof(info->iv);
}
}
|
65cd7bf3 |
static int parse_playlist(HLSContext *c, const char *url, |
9371d70b |
struct playlist *pls, AVIOContext *in) |
cd223e0b |
{ |
2a5891bb |
int ret = 0, is_segment = 0, is_variant = 0, bandwidth = 0; |
c4419103 |
int64_t duration = 0; |
84465f21 |
enum KeyType key_type = KEY_NONE;
uint8_t iv[16] = "";
int has_iv = 0; |
c41b9842 |
char key[MAX_URL_SIZE] = ""; |
21a2b973 |
char line[MAX_URL_SIZE]; |
cd223e0b |
const char *ptr;
int close_in = 0; |
8c929098 |
uint8_t *new_url = NULL; |
cd223e0b |
if (!in) { |
5cdd3b99 |
AVDictionary *opts = NULL; |
cd223e0b |
close_in = 1; |
a9bbf59b |
/* Some HLS servers don't like being sent the range header */ |
5cdd3b99 |
av_dict_set(&opts, "seekable", "0", 0); |
d4e5d8d4 |
// broker prior HTTP options that should be consistent across requests
av_dict_set(&opts, "user-agent", c->user_agent, 0);
av_dict_set(&opts, "cookies", c->cookies, 0); |
4684539c |
av_dict_set(&opts, "headers", c->headers, 0); |
d4e5d8d4 |
|
5cdd3b99 |
ret = avio_open2(&in, url, AVIO_FLAG_READ,
c->interrupt_callback, &opts);
av_dict_free(&opts);
if (ret < 0) |
cd223e0b |
return ret;
}
|
8c929098 |
if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
url = new_url;
|
cd223e0b |
read_chomp_line(in, line, sizeof(line));
if (strcmp(line, "#EXTM3U")) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
|
9371d70b |
if (pls) {
free_segment_list(pls);
pls->finished = 0; |
d3964da2 |
} |
cd223e0b |
while (!url_feof(in)) {
read_chomp_line(in, line, sizeof(line));
if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
struct variant_info info = {{0}};
is_variant = 1;
ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
&info);
bandwidth = atoi(info.bandwidth); |
84465f21 |
} else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
struct key_info info = {{0}};
ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
&info);
key_type = KEY_NONE;
has_iv = 0;
if (!strcmp(info.method, "AES-128"))
key_type = KEY_AES_128;
if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
ff_hex_to_data(iv, info.iv + 2);
has_iv = 1;
}
av_strlcpy(key, info.uri, sizeof(key)); |
cd223e0b |
} else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) { |
9371d70b |
if (!pls) {
if (!new_variant(c, 0, url, NULL)) { |
d3964da2 |
ret = AVERROR(ENOMEM);
goto fail;
} |
9371d70b |
pls = c->playlists[c->n_playlists - 1]; |
d3964da2 |
} |
9371d70b |
pls->target_duration = atoi(ptr) * AV_TIME_BASE; |
cd223e0b |
} else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) { |
9371d70b |
if (!pls) {
if (!new_variant(c, 0, url, NULL)) { |
cd223e0b |
ret = AVERROR(ENOMEM);
goto fail;
} |
9371d70b |
pls = c->playlists[c->n_playlists - 1]; |
cd223e0b |
} |
9371d70b |
pls->start_seq_no = atoi(ptr); |
cd223e0b |
} else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) { |
9371d70b |
if (pls)
pls->finished = 1; |
cd223e0b |
} else if (av_strstart(line, "#EXTINF:", &ptr)) {
is_segment = 1; |
c4419103 |
duration = atof(ptr) * AV_TIME_BASE; |
cd223e0b |
} else if (av_strstart(line, "#", NULL)) {
continue;
} else if (line[0]) {
if (is_variant) {
if (!new_variant(c, bandwidth, line, url)) {
ret = AVERROR(ENOMEM);
goto fail;
}
is_variant = 0;
bandwidth = 0;
}
if (is_segment) {
struct segment *seg; |
9371d70b |
if (!pls) {
if (!new_variant(c, 0, url, NULL)) { |
cd223e0b |
ret = AVERROR(ENOMEM);
goto fail;
} |
9371d70b |
pls = c->playlists[c->n_playlists - 1]; |
cd223e0b |
}
seg = av_malloc(sizeof(struct segment));
if (!seg) {
ret = AVERROR(ENOMEM);
goto fail;
}
seg->duration = duration; |
84465f21 |
seg->key_type = key_type;
if (has_iv) {
memcpy(seg->iv, iv, sizeof(iv));
} else { |
9371d70b |
int seq = pls->start_seq_no + pls->n_segments; |
84465f21 |
memset(seg->iv, 0, sizeof(seg->iv));
AV_WB32(seg->iv + 12, seq);
}
ff_make_absolute_url(seg->key, sizeof(seg->key), url, key); |
f1f60f52 |
ff_make_absolute_url(seg->url, sizeof(seg->url), url, line); |
9371d70b |
dynarray_add(&pls->segments, &pls->n_segments, seg); |
cd223e0b |
is_segment = 0;
}
}
} |
9371d70b |
if (pls)
pls->last_load_time = av_gettime(); |
cd223e0b |
fail: |
8c929098 |
av_free(new_url); |
cd223e0b |
if (close_in) |
ebb92e07 |
avio_close(in); |
cd223e0b |
return ret;
}
|
9371d70b |
static int open_input(HLSContext *c, struct playlist *pls) |
84465f21 |
{ |
5cdd3b99 |
AVDictionary *opts = NULL; |
5846d8a9 |
AVDictionary *opts2 = NULL; |
5cdd3b99 |
int ret; |
9371d70b |
struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no]; |
d4e5d8d4 |
// broker prior HTTP options that should be consistent across requests
av_dict_set(&opts, "user-agent", c->user_agent, 0);
av_dict_set(&opts, "cookies", c->cookies, 0); |
4684539c |
av_dict_set(&opts, "headers", c->headers, 0); |
5cdd3b99 |
av_dict_set(&opts, "seekable", "0", 0); |
d4e5d8d4 |
|
5846d8a9 |
// Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice)
av_dict_copy(&opts2, opts, 0);
|
84465f21 |
if (seg->key_type == KEY_NONE) { |
9371d70b |
ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ,
&pls->parent->interrupt_callback, &opts); |
5cdd3b99 |
goto cleanup; |
84465f21 |
} else if (seg->key_type == KEY_AES_128) {
char iv[33], key[33], url[MAX_URL_SIZE]; |
9371d70b |
if (strcmp(seg->key, pls->key_url)) { |
84465f21 |
URLContext *uc; |
6f1b7b39 |
if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ, |
5846d8a9 |
&pls->parent->interrupt_callback, &opts2) == 0) { |
9371d70b |
if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
!= sizeof(pls->key)) { |
84465f21 |
av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
seg->key);
}
ffurl_close(uc);
} else {
av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
seg->key);
} |
9371d70b |
av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url)); |
84465f21 |
}
ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0); |
9371d70b |
ff_data_to_hex(key, pls->key, sizeof(pls->key), 0); |
84465f21 |
iv[32] = key[32] = '\0';
if (strstr(seg->url, "://"))
snprintf(url, sizeof(url), "crypto+%s", seg->url);
else
snprintf(url, sizeof(url), "crypto:%s", seg->url); |
9371d70b |
if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ,
&pls->parent->interrupt_callback)) < 0) |
5cdd3b99 |
goto cleanup; |
9371d70b |
av_opt_set(pls->input->priv_data, "key", key, 0);
av_opt_set(pls->input->priv_data, "iv", iv, 0); |
5846d8a9 |
|
9371d70b |
if ((ret = ffurl_connect(pls->input, &opts)) < 0) {
ffurl_close(pls->input);
pls->input = NULL; |
5cdd3b99 |
goto cleanup; |
84465f21 |
} |
5cdd3b99 |
ret = 0; |
84465f21 |
} |
5cdd3b99 |
else
ret = AVERROR(ENOSYS);
cleanup:
av_dict_free(&opts); |
5846d8a9 |
av_dict_free(&opts2); |
5cdd3b99 |
return ret; |
84465f21 |
}
|
6cc7f139 |
static int read_data(void *opaque, uint8_t *buf, int buf_size)
{ |
9371d70b |
struct playlist *v = opaque; |
65cd7bf3 |
HLSContext *c = v->parent->priv_data; |
6cc7f139 |
int ret, i;
restart:
if (!v->input) { |
356ae5f6 |
/* If this is a live stream and the reload interval has elapsed since |
9371d70b |
* the last playlist reload, reload the playlists now. */ |
356ae5f6 |
int64_t reload_interval = v->n_segments > 0 ?
v->segments[v->n_segments - 1]->duration :
v->target_duration;
|
617475a9 |
reload: |
6cc7f139 |
if (!v->finished && |
617475a9 |
av_gettime() - v->last_load_time >= reload_interval) {
if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) |
6cc7f139 |
return ret; |
617475a9 |
/* If we need to reload the playlist again below (if
* there's still no more segments), switch to a reload
* interval of half the target duration. */ |
c4419103 |
reload_interval = v->target_duration / 2; |
617475a9 |
} |
6cc7f139 |
if (v->cur_seq_no < v->start_seq_no) {
av_log(NULL, AV_LOG_WARNING,
"skipping %d segments ahead, expired from playlists\n",
v->start_seq_no - v->cur_seq_no);
v->cur_seq_no = v->start_seq_no;
}
if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
if (v->finished)
return AVERROR_EOF; |
356ae5f6 |
while (av_gettime() - v->last_load_time < reload_interval) { |
9957cdbf |
if (ff_check_interrupt(c->interrupt_callback)) |
6cc7f139 |
return AVERROR_EXIT; |
896bb0d7 |
av_usleep(100*1000); |
6cc7f139 |
}
/* Enough time has elapsed since the last reload */
goto reload;
}
|
d4e5d8d4 |
ret = open_input(c, v); |
6cc7f139 |
if (ret < 0)
return ret;
} |
a6aa7a1a |
ret = ffurl_read(v->input, buf, buf_size); |
6cc7f139 |
if (ret > 0)
return ret; |
a6aa7a1a |
ffurl_close(v->input); |
6cc7f139 |
v->input = NULL;
v->cur_seq_no++;
c->end_of_segment = 1;
c->cur_seq_no = v->cur_seq_no;
|
cdd2d73d |
if (v->ctx && v->ctx->nb_streams &&
v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) { |
a92a7ddc |
v->needed = 0;
for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams;
i++) {
if (v->parent->streams[i]->discard < AVDISCARD_ALL)
v->needed = 1;
} |
6cc7f139 |
}
if (!v->needed) { |
9371d70b |
av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n", |
6cc7f139 |
v->index);
return AVERROR_EOF;
}
goto restart;
}
|
9371d70b |
static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls)
{
int variant_count = 0;
int i, j;
for (i = 0; i < c->n_variants && variant_count < 2; i++) {
struct variant *v = c->variants[i];
for (j = 0; j < v->n_playlists; j++) {
if (v->playlists[j] == pls) {
variant_count++;
break;
}
}
}
return variant_count >= 2;
}
|
65cd7bf3 |
static int hls_read_header(AVFormatContext *s) |
cd223e0b |
{ |
db6e2e84 |
URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque; |
65cd7bf3 |
HLSContext *c = s->priv_data; |
cd223e0b |
int ret = 0, i, j, stream_offset = 0;
|
9957cdbf |
c->interrupt_callback = &s->interrupt_callback;
|
d4e5d8d4 |
// if the URL context is good, read important options we must broker later |
665f2d43 |
if (u && u->prot->priv_data_class) { |
d4e5d8d4 |
// get the previous user agent & set back to null if string size is zero |
665f2d43 |
av_freep(&c->user_agent); |
d4e5d8d4 |
av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent)); |
665f2d43 |
if (c->user_agent && !strlen(c->user_agent)) |
d4e5d8d4 |
av_freep(&c->user_agent);
// get the previous cookies & set back to null if string size is zero |
665f2d43 |
av_freep(&c->cookies); |
d4e5d8d4 |
av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies)); |
665f2d43 |
if (c->cookies && !strlen(c->cookies)) |
d4e5d8d4 |
av_freep(&c->cookies); |
4684539c |
// get the previous headers & set back to null if string size is zero
av_freep(&c->headers);
av_opt_get(u->priv_data, "headers", 0, (uint8_t**)&(c->headers));
if (c->headers && !strlen(c->headers))
av_freep(&c->headers); |
d4e5d8d4 |
}
|
cd223e0b |
if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
goto fail;
if (c->n_variants == 0) {
av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
ret = AVERROR_EOF;
goto fail;
} |
9371d70b |
/* If the playlist only contained playlists (Master Playlist),
* parse each individual playlist. */
if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) |
cd223e0b |
goto fail;
}
}
|
9371d70b |
if (c->variants[0]->playlists[0]->n_segments == 0) { |
cd223e0b |
av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
ret = AVERROR_EOF;
goto fail;
}
/* If this isn't a live stream, calculate the total duration of the
* stream. */ |
9371d70b |
if (c->variants[0]->playlists[0]->finished) { |
419a3d8a |
int64_t duration = 0; |
9371d70b |
for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
duration += c->variants[0]->playlists[0]->segments[i]->duration; |
419a3d8a |
s->duration = duration; |
cd223e0b |
}
|
9371d70b |
/* Open the demuxer for each playlist */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i]; |
6cc7f139 |
AVInputFormat *in_fmt = NULL; |
c110cbf6 |
|
9371d70b |
if (pls->n_segments == 0) |
cd223e0b |
continue; |
6cc7f139 |
|
9371d70b |
if (!(pls->ctx = avformat_alloc_context())) { |
603b8bc2 |
ret = AVERROR(ENOMEM);
goto fail;
}
|
9371d70b |
pls->index = i;
pls->needed = 1;
pls->parent = s; |
6cc7f139 |
/* If this is a live stream with more than 3 segments, start at the
* third last segment. */ |
9371d70b |
pls->cur_seq_no = pls->start_seq_no;
if (!pls->finished && pls->n_segments > 3)
pls->cur_seq_no = pls->start_seq_no + pls->n_segments - 3; |
6cc7f139 |
|
9371d70b |
pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls, |
6cc7f139 |
read_data, NULL, NULL); |
9371d70b |
pls->pb.seekable = 0;
ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url, |
6cc7f139 |
NULL, 0, 0); |
115a5730 |
if (ret < 0) {
/* Free the ctx - it isn't initialized properly at this point,
* so avformat_close_input shouldn't be called. If
* avformat_open_input fails below, it frees and zeros the
* context, so it doesn't need any special treatment like this. */ |
9371d70b |
av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
avformat_free_context(pls->ctx);
pls->ctx = NULL; |
6cc7f139 |
goto fail; |
115a5730 |
} |
9371d70b |
pls->ctx->pb = &pls->pb;
pls->stream_offset = stream_offset;
ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL); |
cd223e0b |
if (ret < 0)
goto fail; |
9696740a |
|
9371d70b |
pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER;
ret = avformat_find_stream_info(pls->ctx, NULL); |
30051224 |
if (ret < 0)
goto fail; |
23db5418 |
|
9371d70b |
/* Create new AVStreams for each stream in this playlist */
for (j = 0; j < pls->ctx->nb_streams; j++) { |
84ad31ff |
AVStream *st = avformat_new_stream(s, NULL); |
9371d70b |
AVStream *ist = pls->ctx->streams[j]; |
cd223e0b |
if (!st) {
ret = AVERROR(ENOMEM);
goto fail;
} |
84ad31ff |
st->id = i; |
a12a618a |
avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); |
9371d70b |
avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec);
}
stream_offset += pls->ctx->nb_streams;
}
/* Create a program for each variant */
for (i = 0; i < c->n_variants; i++) {
struct variant *v = c->variants[i];
char bitrate_str[20];
AVProgram *program;
snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth);
program = av_new_program(s, i);
if (!program)
goto fail;
av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0);
for (j = 0; j < v->n_playlists; j++) {
struct playlist *pls = v->playlists[j];
int is_shared = playlist_in_multiple_variants(c, pls);
int k;
for (k = 0; k < pls->ctx->nb_streams; k++) {
struct AVStream *st = s->streams[pls->stream_offset + k];
ff_program_add_stream_index(s, i, pls->stream_offset + k);
/* Set variant_bitrate for streams unique to this variant */
if (!is_shared && v->bandwidth)
av_dict_set(&st->metadata, "variant_bitrate", bitrate_str, 0);
} |
cd223e0b |
}
}
|
6cc7f139 |
c->first_packet = 1; |
6f20921d |
c->first_timestamp = AV_NOPTS_VALUE; |
2b3d041c |
c->seek_timestamp = AV_NOPTS_VALUE; |
cd223e0b |
return 0;
fail: |
9371d70b |
free_playlist_list(c); |
cd223e0b |
free_variant_list(c);
return ret;
}
|
6cc7f139 |
static int recheck_discard_flags(AVFormatContext *s, int first) |
cd223e0b |
{ |
65cd7bf3 |
HLSContext *c = s->priv_data; |
6cc7f139 |
int i, changed = 0; |
cd223e0b |
|
6cc7f139 |
/* Check if any new streams are needed */ |
9371d70b |
for (i = 0; i < c->n_playlists; i++)
c->playlists[i]->cur_needed = 0; |
6cc7f139 |
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i]; |
9371d70b |
struct playlist *pls = c->playlists[s->streams[i]->id]; |
6cc7f139 |
if (st->discard < AVDISCARD_ALL) |
9371d70b |
pls->cur_needed = 1; |
cd223e0b |
} |
9371d70b |
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
if (pls->cur_needed && !pls->needed) {
pls->needed = 1; |
6cc7f139 |
changed = 1; |
9371d70b |
pls->cur_seq_no = c->cur_seq_no;
pls->pb.eof_reached = 0;
av_log(s, AV_LOG_INFO, "Now receiving playlist %d\n", i);
} else if (first && !pls->cur_needed && pls->needed) {
if (pls->input)
ffurl_close(pls->input);
pls->input = NULL;
pls->needed = 0; |
6cc7f139 |
changed = 1; |
9371d70b |
av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i); |
cd223e0b |
}
} |
6cc7f139 |
return changed; |
cd223e0b |
}
|
65cd7bf3 |
static int hls_read_packet(AVFormatContext *s, AVPacket *pkt) |
cd223e0b |
{ |
65cd7bf3 |
HLSContext *c = s->priv_data; |
9371d70b |
int ret, i, minplaylist = -1; |
cd223e0b |
|
6cc7f139 |
if (c->first_packet) {
recheck_discard_flags(s, 1);
c->first_packet = 0; |
cd223e0b |
} |
6cc7f139 |
|
cd223e0b |
start: |
6cc7f139 |
c->end_of_segment = 0; |
9371d70b |
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
/* Make sure we've got one buffered packet from each open playlist |
cd223e0b |
* stream */ |
9371d70b |
if (pls->needed && !pls->pkt.data) { |
811de351 |
while (1) {
int64_t ts_diff; |
2b3d041c |
AVStream *st; |
9371d70b |
ret = av_read_frame(pls->ctx, &pls->pkt); |
811de351 |
if (ret < 0) { |
9371d70b |
if (!url_feof(&pls->pb) && ret != AVERROR_EOF) |
811de351 |
return ret; |
9371d70b |
reset_packet(&pls->pkt); |
2b3d041c |
break; |
811de351 |
} else { |
e1d5b244 |
if (c->first_timestamp == AV_NOPTS_VALUE && |
9371d70b |
pls->pkt.dts != AV_NOPTS_VALUE)
c->first_timestamp = av_rescale_q(pls->pkt.dts,
pls->ctx->streams[pls->pkt.stream_index]->time_base, |
e1d5b244 |
AV_TIME_BASE_Q); |
811de351 |
}
if (c->seek_timestamp == AV_NOPTS_VALUE)
break;
|
9371d70b |
if (pls->pkt.dts == AV_NOPTS_VALUE) { |
811de351 |
c->seek_timestamp = AV_NOPTS_VALUE;
break;
}
|
9371d70b |
st = pls->ctx->streams[pls->pkt.stream_index];
ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE, |
2b3d041c |
st->time_base.den, AV_ROUND_DOWN) -
c->seek_timestamp;
if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY || |
9371d70b |
pls->pkt.flags & AV_PKT_FLAG_KEY)) { |
2b3d041c |
c->seek_timestamp = AV_NOPTS_VALUE;
break; |
811de351 |
} |
9371d70b |
av_free_packet(&pls->pkt);
reset_packet(&pls->pkt); |
cd223e0b |
}
} |
eb33ba04 |
/* Check if this stream still is on an earlier segment number, or
* has the packet with the lowest dts */ |
9371d70b |
if (pls->pkt.data) {
struct playlist *minpls = minplaylist < 0 ?
NULL : c->playlists[minplaylist];
if (minplaylist < 0 || pls->cur_seq_no < minpls->cur_seq_no) {
minplaylist = i;
} else if (pls->cur_seq_no == minpls->cur_seq_no) {
int64_t dts = pls->pkt.dts;
int64_t mindts = minpls->pkt.dts;
AVStream *st = pls->ctx->streams[pls->pkt.stream_index];
AVStream *minst = minpls->ctx->streams[minpls->pkt.stream_index]; |
3ac754b9 |
|
9d64f236 |
if (dts == AV_NOPTS_VALUE) { |
9371d70b |
minplaylist = i; |
9d64f236 |
} else if (mindts != AV_NOPTS_VALUE) {
if (st->start_time != AV_NOPTS_VALUE)
dts -= st->start_time;
if (minst->start_time != AV_NOPTS_VALUE)
mindts -= minst->start_time;
if (av_compare_ts(dts, st->time_base,
mindts, minst->time_base) < 0) |
9371d70b |
minplaylist = i; |
9d64f236 |
} |
3ac754b9 |
} |
cd223e0b |
}
} |
6cc7f139 |
if (c->end_of_segment) {
if (recheck_discard_flags(s, 0))
goto start;
} |
cd223e0b |
/* If we got a packet, return it */ |
9371d70b |
if (minplaylist >= 0) {
*pkt = c->playlists[minplaylist]->pkt;
pkt->stream_index += c->playlists[minplaylist]->stream_offset;
reset_packet(&c->playlists[minplaylist]->pkt); |
cd223e0b |
return 0;
} |
6cc7f139 |
return AVERROR_EOF; |
cd223e0b |
}
|
65cd7bf3 |
static int hls_close(AVFormatContext *s) |
cd223e0b |
{ |
65cd7bf3 |
HLSContext *c = s->priv_data; |
cd223e0b |
|
9371d70b |
free_playlist_list(c); |
cd223e0b |
free_variant_list(c);
return 0;
}
|
65cd7bf3 |
static int hls_read_seek(AVFormatContext *s, int stream_index, |
cd223e0b |
int64_t timestamp, int flags)
{ |
65cd7bf3 |
HLSContext *c = s->priv_data; |
6cc7f139 |
int i, j, ret; |
cd223e0b |
|
9371d70b |
if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->playlists[0]->finished) |
cd223e0b |
return AVERROR(ENOSYS);
|
2b3d041c |
c->seek_flags = flags;
c->seek_timestamp = stream_index < 0 ? timestamp :
av_rescale_rnd(timestamp, AV_TIME_BASE,
s->streams[stream_index]->time_base.den,
flags & AVSEEK_FLAG_BACKWARD ?
AV_ROUND_DOWN : AV_ROUND_UP); |
c4419103 |
timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, stream_index >= 0 ? |
0d8a33b1 |
s->streams[stream_index]->time_base.den :
AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ?
AV_ROUND_DOWN : AV_ROUND_UP); |
811de351 |
if (s->duration < c->seek_timestamp) {
c->seek_timestamp = AV_NOPTS_VALUE;
return AVERROR(EIO);
}
|
0d8a33b1 |
ret = AVERROR(EIO); |
9371d70b |
for (i = 0; i < c->n_playlists; i++) { |
0d8a33b1 |
/* Reset reading */ |
9371d70b |
struct playlist *pls = c->playlists[i]; |
c4419103 |
int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
0 : c->first_timestamp; |
9371d70b |
if (pls->input) {
ffurl_close(pls->input);
pls->input = NULL; |
cd223e0b |
} |
9371d70b |
av_free_packet(&pls->pkt);
reset_packet(&pls->pkt);
pls->pb.eof_reached = 0; |
a4f97be1 |
/* Clear any buffered data */ |
9371d70b |
pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer; |
a4f97be1 |
/* Reset the pos, to let the mpegts demuxer know we've seeked. */ |
9371d70b |
pls->pb.pos = 0; |
cd223e0b |
|
6cc7f139 |
/* Locate the segment that contains the target timestamp */ |
9371d70b |
for (j = 0; j < pls->n_segments; j++) { |
6cc7f139 |
if (timestamp >= pos && |
9371d70b |
timestamp < pos + pls->segments[j]->duration) {
pls->cur_seq_no = pls->start_seq_no + j; |
6cc7f139 |
ret = 0;
break;
} |
9371d70b |
pos += pls->segments[j]->duration; |
cd223e0b |
} |
2b3d041c |
if (ret) |
811de351 |
c->seek_timestamp = AV_NOPTS_VALUE; |
cd223e0b |
} |
6cc7f139 |
return ret; |
cd223e0b |
}
|
65cd7bf3 |
static int hls_probe(AVProbeData *p) |
cd223e0b |
{
/* Require #EXTM3U at the start, and either one of the ones below
* somewhere for a proper match. */
if (strncmp(p->buf, "#EXTM3U", 7))
return 0;
if (strstr(p->buf, "#EXT-X-STREAM-INF:") ||
strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
return AVPROBE_SCORE_MAX;
return 0;
}
|
2772258a |
AVInputFormat ff_hls_demuxer = { |
c1df37e5 |
.name = "hls,applehttp", |
6774247a |
.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), |
65cd7bf3 |
.priv_data_size = sizeof(HLSContext),
.read_probe = hls_probe,
.read_header = hls_read_header,
.read_packet = hls_read_packet,
.read_close = hls_close,
.read_seek = hls_read_seek, |
cd223e0b |
}; |