From 97887895308d8912ffa78400fcccd1ddb2c58680 Mon Sep 17 00:00:00 2001 From: wm4 Date: Thu, 6 Jun 2013 20:33:02 +0200 Subject: stream: rename cache2.c to cache.c I never found cache1.c (whatever it was named, if it ever existed). cache2.h will be deleted later, so don't go through the trouble of renaming it. --- stream/cache.c | 804 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 804 insertions(+) create mode 100644 stream/cache.c (limited to 'stream/cache.c') diff --git a/stream/cache.c b/stream/cache.c new file mode 100644 index 0000000000..a0ad2559ae --- /dev/null +++ b/stream/cache.c @@ -0,0 +1,804 @@ +/* + * This file is part of MPlayer. + * + * MPlayer 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. + * + * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +// Initial draft of my new cache system... +// Note it runs in 2 processes (using fork()), but doesn't require locking!! +// TODO: seeking, data consistency checking + +#define READ_SLEEP_TIME 10 +// These defines are used to reduce the cost of many successive +// seeks (e.g. when a file has no index) by spinning quickly at first. +#define INITIAL_FILL_USLEEP_TIME 1000 +#define INITIAL_FILL_USLEEP_COUNT 10 +#define FILL_USLEEP_TIME 50000 +#define PREFILL_SLEEP_TIME 200 +#define CONTROL_SLEEP_TIME 1 + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "config.h" + +#include "osdep/shmem.h" +#include "osdep/timer.h" +#if defined(__MINGW32__) +#include +static void ThreadProc(void *s); +#elif defined(PTHREAD_CACHE) +#include +static void *ThreadProc(void *s); +#else +#include +#define FORKED_CACHE 1 +#endif +#ifndef FORKED_CACHE +#define FORKED_CACHE 0 +#endif + +#include "core/mp_msg.h" + +#include "stream.h" +#include "cache2.h" +#include "core/mp_common.h" + +typedef struct { + // constats: + unsigned char *buffer; // base pointer of the allocated buffer memory + int64_t buffer_size; // size of the allocated buffer memory + int sector_size; // size of a single sector (2048/2324) + int64_t back_size; // we should keep back_size amount of old bytes for backward seek + int64_t fill_limit; // we should fill buffer only if space>=fill_limit + int64_t seek_limit; // keep filling cache if distance is less that seek limit +#if FORKED_CACHE + pid_t ppid; // parent PID to detect killed parent +#endif + // filler's pointers: + int eof; + int64_t min_filepos; // buffer contain only a part of the file, from min-max pos + int64_t max_filepos; + int64_t offset; // filepos <-> bufferpos offset value (filepos of the buffer's first byte) + // reader's pointers: + int64_t read_filepos; + // commands/locking: +// int seek_lock; // 1 if we will seek/reset buffer, 2 if we are ready for cmd +// int fifo_flag; // 1 if we should use FIFO to notice cache about buffer reads. +// callback + stream_t *stream; + volatile int control; + volatile uint64_t control_uint_arg; + volatile double control_double_arg; + volatile struct stream_lang_req control_lang_arg; + volatile int control_res; + volatile double stream_time_length; + volatile double stream_time_pos; + volatile double stream_start_time; + volatile int idle; +} cache_vars_t; + +static void cache_wakeup(stream_t *s) +{ +#if FORKED_CACHE + // signal process to wake up immediately + kill(s->cache_pid, SIGUSR1); +#endif +} + +static void cache_flush(cache_vars_t *s) +{ + s->offset = s->min_filepos = s->max_filepos = s->read_filepos; // drop cache content :( +} + +static int cache_read(cache_vars_t *s, unsigned char *buf, int size) +{ + int total = 0; + int sleep_count = 0; + int64_t last_max = s->max_filepos; + while (size > 0) { + int64_t pos, newb, len; + + //printf("CACHE2_READ: 0x%X <= 0x%X <= 0x%X \n",s->min_filepos,s->read_filepos,s->max_filepos); + + if (s->read_filepos >= s->max_filepos || s->read_filepos < + s->min_filepos) { + // eof? + if (s->eof) + break; + if (s->max_filepos == last_max) { + if (sleep_count++ == 10) + mp_msg(MSGT_CACHE, MSGL_WARN, "Cache empty, consider " + "increasing -cache and/or -cache-min. " + "[performance issue]\n"); + } else { + last_max = s->max_filepos; + sleep_count = 0; + } + // waiting for buffer fill... + if (stream_check_interrupt(READ_SLEEP_TIME)) { + s->eof = 1; + break; + } + continue; // try again... + } + sleep_count = 0; + + newb = s->max_filepos - s->read_filepos; // new bytes in the buffer + +// printf("*** newb: %d bytes ***\n",newb); + + pos = s->read_filepos - s->offset; + if (pos < 0) + pos += s->buffer_size; + else if (pos >= s->buffer_size) + pos -= s->buffer_size; + + if (newb > s->buffer_size - pos) + newb = s->buffer_size - pos; // handle wrap... + if (newb > size) + newb = size; + + // check: + if (s->read_filepos < s->min_filepos) + mp_msg(MSGT_CACHE, MSGL_ERR, + "Ehh. s->read_fileposmin_filepos !!! Report bug...\n"); + + // len=write(mem,newb) + //printf("Buffer read: %d bytes\n",newb); + memcpy(buf, &s->buffer[pos], newb); + buf += newb; + len = newb; + // ... + + s->read_filepos += len; + size -= len; + total += len; + + } + return total; +} + +static int cache_fill(cache_vars_t *s) +{ + int64_t back, back2, newb, space, len, pos; + int64_t read = s->read_filepos; + int read_chunk; + int wraparound_copy = 0; + + if (read < s->min_filepos || read > s->max_filepos) { + // seek... + mp_msg(MSGT_CACHE, MSGL_DBG2, + "Out of boundaries... seeking to 0x%" PRIX64 " \n", read); + // drop cache contents only if seeking backward or too much fwd. + // This is also done for on-disk files, since it loses the backseek cache. + // That in turn can cause major bandwidth increase and performance + // issues with e.g. mov or badly interleaved files + if (read < s->min_filepos || read >= s->max_filepos + s->seek_limit) { + cache_flush(s); + if (s->stream->eof) + stream_reset(s->stream); + stream_seek_internal(s->stream, read); + mp_msg(MSGT_CACHE, MSGL_DBG2, "Seek done. new pos: 0x%" PRIX64 " \n", + (int64_t)stream_tell(s->stream)); + } + } + + // calc number of back-bytes: + back = read - s->min_filepos; + if (back < 0) + back = 0; // strange... + if (back > s->back_size) + back = s->back_size; + + // calc number of new bytes: + newb = s->max_filepos - read; + if (newb < 0) + newb = 0; // strange... + + // calc free buffer space: + space = s->buffer_size - (newb + back); + + // calc bufferpos: + pos = s->max_filepos - s->offset; + if (pos >= s->buffer_size) + pos -= s->buffer_size; // wrap-around + + if (space < s->fill_limit) { +// printf("Buffer is full (%d bytes free, limit: %d)\n",space,s->fill_limit); + return 0; // no fill... + } + +// printf("### read=0x%X back=%d newb=%d space=%d pos=%d\n",read,back,newb,space,pos); + + // try to avoid wrap-around. If not possible due to sector size + // do an extra copy. + if (space > s->buffer_size - pos) { + if (s->buffer_size - pos >= s->sector_size) + space = s->buffer_size - pos; + else { + space = s->sector_size; + wraparound_copy = 1; + } + } + + // limit one-time block size + read_chunk = s->stream->read_chunk; + if (!read_chunk) + read_chunk = 4 * s->sector_size; + space = FFMIN(space, read_chunk); + +#if 1 + // back+newb+space <= buffer_size + back2 = s->buffer_size - (space + newb); // max back size + if (s->min_filepos < (read - back2)) + s->min_filepos = read - back2; +#else + s->min_filepos = read - back; // avoid seeking-back to temp area... +#endif + + if (wraparound_copy) { + int to_copy; + len = stream_read_internal(s->stream, s->stream->buffer, space); + to_copy = FFMIN(len, s->buffer_size - pos); + memcpy(s->buffer + pos, s->stream->buffer, to_copy); + memcpy(s->buffer, s->stream->buffer + to_copy, len - to_copy); + } else + len = stream_read_internal(s->stream, &s->buffer[pos], space); + s->eof = !len; + + s->max_filepos += len; + if (pos + len >= s->buffer_size) + s->offset += s->buffer_size; // wrap... + + return len; + +} + +static int cache_execute_control(cache_vars_t *s) +{ + double double_res; + unsigned uint_res; + uint64_t uint64_res; + int needs_flush = 0; + static double last; + int quit = s->control == -2; + uint64_t old_pos = s->stream->pos; + int old_eof = s->stream->eof; + if (quit || !s->stream->control) { + s->stream_time_length = 0; + s->stream_time_pos = MP_NOPTS_VALUE; + s->control_res = STREAM_UNSUPPORTED; + s->control = -1; + return !quit; + } + if (mp_time_sec() - last > 0.099) { + double len, pos; + if (s->stream->control(s->stream, STREAM_CTRL_GET_TIME_LENGTH, + &len) == STREAM_OK) + s->stream_time_length = len; + else + s->stream_time_length = 0; + if (s->stream->control(s->stream, STREAM_CTRL_GET_CURRENT_TIME, + &pos) == STREAM_OK) + s->stream_time_pos = pos; + else + s->stream_time_pos = MP_NOPTS_VALUE; + if (s->stream->control(s->stream, STREAM_CTRL_GET_START_TIME, + &pos) == STREAM_OK) + s->stream_start_time = pos; + else + s->stream_start_time = MP_NOPTS_VALUE; +#if FORKED_CACHE + // if parent PID changed, main process was killed -> exit + if (s->ppid != getppid()) { + mp_msg(MSGT_CACHE, MSGL_WARN, + "Parent process disappeared, exiting cache process.\n"); + return 0; + } +#endif + last = mp_time_sec(); + } + if (s->control == -1) + return 1; + switch (s->control) { + case STREAM_CTRL_SEEK_TO_TIME: + needs_flush = 1; + case STREAM_CTRL_GET_CURRENT_TIME: + case STREAM_CTRL_GET_ASPECT_RATIO: + case STREAM_CTRL_GET_START_TIME: + case STREAM_CTRL_GET_CHAPTER_TIME: + double_res = s->control_double_arg; + s->control_res = s->stream->control(s->stream, s->control, &double_res); + s->control_double_arg = double_res; + break; + case STREAM_CTRL_SEEK_TO_CHAPTER: + case STREAM_CTRL_SET_ANGLE: + needs_flush = 1; + uint_res = s->control_uint_arg; + case STREAM_CTRL_GET_NUM_TITLES: + case STREAM_CTRL_GET_NUM_CHAPTERS: + case STREAM_CTRL_GET_CURRENT_TITLE: + case STREAM_CTRL_GET_CURRENT_CHAPTER: + case STREAM_CTRL_GET_NUM_ANGLES: + case STREAM_CTRL_GET_ANGLE: + s->control_res = s->stream->control(s->stream, s->control, &uint_res); + s->control_uint_arg = uint_res; + break; + case STREAM_CTRL_GET_SIZE: + s->control_res = s->stream->control(s->stream, s->control, &uint64_res); + s->control_uint_arg = uint64_res; + break; + case STREAM_CTRL_GET_LANG: + s->control_res = s->stream->control(s->stream, s->control, + (void *)&s->control_lang_arg); + break; + case STREAM_CTRL_MANAGES_TIMELINE: + s->control_res = s->stream->control(s->stream, s->control, NULL); + break; + default: + s->control_res = STREAM_UNSUPPORTED; + break; + } + if (s->control_res == STREAM_OK && needs_flush) { + s->read_filepos = s->stream->pos; + s->eof = s->stream->eof; + cache_flush(s); + } else if (needs_flush && + (old_pos != s->stream->pos || old_eof != s->stream->eof)) + mp_msg( + MSGT_STREAM, MSGL_ERR, + "STREAM_CTRL changed stream pos but returned error, this is not allowed!\n"); + s->control = -1; + return 1; +} + +static void *shared_alloc(int64_t size) +{ +#if FORKED_CACHE + return shmem_alloc(size); +#else + return malloc(size); +#endif +} + +static void shared_free(void *ptr, int64_t size) +{ +#if FORKED_CACHE + shmem_free(ptr, size); +#else + free(ptr); +#endif +} + +static cache_vars_t *cache_init(int64_t size, int sector) +{ + int64_t num; + cache_vars_t *s = shared_alloc(sizeof(cache_vars_t)); + if (s == NULL) + return NULL; + + memset(s, 0, sizeof(cache_vars_t)); + num = size / sector; + if (num < 32) + num = 32; + //64kb min_size + s->buffer_size = num * sector; + s->sector_size = sector; + s->buffer = shared_alloc(s->buffer_size); + + if (s->buffer == NULL) { + shared_free(s, sizeof(cache_vars_t)); + return NULL; + } + + s->fill_limit = 8 * sector; + s->back_size = s->buffer_size / 2; +#if FORKED_CACHE + s->ppid = getpid(); +#endif + return s; +} + +void cache_uninit(stream_t *s) +{ + cache_vars_t *c = s->cache_data; + if (s->cache_pid) { +#if !FORKED_CACHE + cache_do_control(s, -2, NULL); +#else + kill(s->cache_pid, SIGKILL); + waitpid(s->cache_pid, NULL, 0); +#endif + s->cache_pid = 0; + } + if (!c) + return; + shared_free(c->buffer, c->buffer_size); + c->buffer = NULL; + c->stream = NULL; + shared_free(s->cache_data, sizeof(cache_vars_t)); + s->cache_data = NULL; +} + +#if FORKED_CACHE +static void exit_sighandler(int x) +{ + // close stream + exit(0); +} + +static void dummy_sighandler(int x) +{ +} +#endif + +/** + * Main loop of the cache process or thread. + */ +static void cache_mainloop(cache_vars_t *s) +{ + int sleep_count = 0; +#if FORKED_CACHE + struct sigaction sa = { + .sa_handler = SIG_IGN + }; + sigaction(SIGUSR1, &sa, NULL); +#endif + do { + if (!cache_fill(s)) { + s->idle = 1; +#if FORKED_CACHE + // Let signal wake us up, we cannot leave this + // enabled since we do not handle EINTR in most places. + // This might need extra code to work on BSD. + sa.sa_handler = dummy_sighandler; + sigaction(SIGUSR1, &sa, NULL); +#endif + if (sleep_count < INITIAL_FILL_USLEEP_COUNT) { + sleep_count++; + mp_sleep_us(INITIAL_FILL_USLEEP_TIME); + } else + mp_sleep_us(FILL_USLEEP_TIME); // idle +#if FORKED_CACHE + sa.sa_handler = SIG_IGN; + sigaction(SIGUSR1, &sa, NULL); +#endif + } else { + sleep_count = 0; + s->idle = 0; + } + } while (cache_execute_control(s)); +} + +int stream_enable_cache_percent(stream_t *stream, int64_t stream_cache_size, + float stream_cache_min_percent, + float stream_cache_seek_min_percent) +{ + return stream_enable_cache(stream, stream_cache_size * 1024, + stream_cache_size * 1024 * + (stream_cache_min_percent / 100.0), + stream_cache_size * 1024 * + (stream_cache_seek_min_percent / 100.0)); +} + +/** + * \return 1 on success, 0 if the function was interrupted and -1 on error + */ +int stream_enable_cache(stream_t *stream, int64_t size, int64_t min, + int64_t seek_limit) +{ + if (size < 0) + size = stream->cache_size * 1024; + if (!size) + return 1; + mp_tmsg(MSGT_NETWORK, MSGL_INFO, "Cache size set to %" PRId64 " KiB\n", + size / 1024); + + int ss = stream->sector_size ? stream->sector_size : STREAM_BUFFER_SIZE; + int res = -1; + cache_vars_t *s; + + if (size > SIZE_MAX) { + mp_msg(MSGT_CACHE, MSGL_FATAL, + "Cache size larger than max. allocation size\n"); + return -1; + } + + s = cache_init(size, ss); + if (s == NULL) + return -1; + stream->cache_data = s; + s->stream = stream; // callback + s->seek_limit = seek_limit; + + + //make sure that we won't wait from cache_fill + //more data than it is allowed to fill + if (s->seek_limit > s->buffer_size - s->fill_limit) + s->seek_limit = s->buffer_size - s->fill_limit; + if (min > s->buffer_size - s->fill_limit) + min = s->buffer_size - s->fill_limit; + // to make sure we wait for the cache process/thread to be active + // before continuing + if (min <= 0) + min = 1; + +#if FORKED_CACHE + if ((stream->cache_pid = fork())) { + if ((pid_t)stream->cache_pid == -1) + stream->cache_pid = 0; +#else + { + stream_t *stream2 = malloc(sizeof(stream_t)); + memcpy(stream2, s->stream, sizeof(stream_t)); + s->stream = stream2; +#if defined(__MINGW32__) + stream->cache_pid = _beginthread(ThreadProc, 0, s); +#else + { + pthread_t tid; + pthread_create(&tid, NULL, ThreadProc, s); + stream->cache_pid = 1; + } +#endif +#endif + if (!stream->cache_pid) { + mp_msg(MSGT_CACHE, MSGL_ERR, + "Starting cache process/thread failed: %s.\n", + strerror(errno)); + goto err_out; + } + // wait until cache is filled at least prefill_init % + mp_msg(MSGT_CACHE, MSGL_V, "CACHE_PRE_INIT: %" PRId64 " [%" PRId64 "] " + "%" PRId64 " pre:%" PRId64 " eof:%d \n", + s->min_filepos, s->read_filepos, s->max_filepos, min, s->eof); + while (s->read_filepos < s->min_filepos || + s->max_filepos - s->read_filepos < min) + { + mp_tmsg(MSGT_CACHE, MSGL_STATUS, "\rCache fill: %5.2f%% " + "(%" PRId64 " bytes) ", + 100.0 * (float)(s->max_filepos - s->read_filepos) / + (float)(s->buffer_size), + s->max_filepos - s->read_filepos); + if (s->eof) + break; // file is smaller than prefill size + if (stream_check_interrupt(PREFILL_SLEEP_TIME)) { + res = 0; + goto err_out; + } + } + mp_msg(MSGT_CACHE, MSGL_STATUS, "\n"); + stream->cached = true; + return 1; // parent exits + +err_out: + cache_uninit(stream); + return res; + } + +#if FORKED_CACHE + signal(SIGTERM, exit_sighandler); // kill + cache_mainloop(s); + // make sure forked code never leaves this function + exit(0); +#endif +} + +#if !FORKED_CACHE +#if defined(__MINGW32__) +static void ThreadProc(void *s) +{ + cache_mainloop(s); + _endthread(); +} +#else +static void *ThreadProc(void *s) +{ + cache_mainloop(s); + return NULL; +} +#endif +#endif + +int cache_stream_fill_buffer(stream_t *s) +{ + int len; + int sector_size; + if (!s->cache_pid) + return stream_fill_buffer(s); + + if (s->pos != ((cache_vars_t *)s->cache_data)->read_filepos) + mp_msg(MSGT_CACHE, MSGL_ERR, + "!!! read_filepos differs!!! report this bug...\n"); + sector_size = ((cache_vars_t *)s->cache_data)->sector_size; + if (sector_size > STREAM_MAX_SECTOR_SIZE) { + mp_msg(MSGT_CACHE, MSGL_ERR, "Sector size %i larger than maximum %i\n", + sector_size, + STREAM_MAX_SECTOR_SIZE); + sector_size = STREAM_MAX_SECTOR_SIZE; + } + + len = cache_read(s->cache_data, s->buffer, sector_size); + //printf("cache_stream_fill_buffer->read -> %d\n",len); + + if (len <= 0) { + s->eof = 1; + s->buf_pos = s->buf_len = 0; + return 0; + } + s->eof = 0; + s->buf_pos = 0; + s->buf_len = len; + s->pos += len; +// printf("[%d]",len);fflush(stdout); + stream_capture_write(s); + return len; + +} + +int cache_stream_seek_long(stream_t *stream, int64_t pos) +{ + cache_vars_t *s; + int64_t newpos; + if (!stream->cache_pid) + return stream_seek_long(stream, pos); + + s = stream->cache_data; +// s->seek_lock=1; + + mp_msg(MSGT_CACHE, MSGL_DBG2, "CACHE2_SEEK: 0x%" PRIX64 " <= 0x%" PRIX64 + " (0x%" PRIX64 ") <= 0x%" PRIX64 " \n", + s->min_filepos, pos, s->read_filepos, s->max_filepos); + + newpos = pos / s->sector_size; + newpos *= s->sector_size; // align + stream->pos = s->read_filepos = newpos; + s->eof = 0; // !!!!!!! + cache_wakeup(stream); + + cache_stream_fill_buffer(stream); + + pos -= newpos; + if (pos >= 0 && pos <= stream->buf_len) { + stream->buf_pos = pos; // byte position in sector + return 1; + } + +// stream->buf_pos=stream->buf_len=0; +// return 1; + + mp_msg(MSGT_CACHE, MSGL_V, + "cache_stream_seek: WARNING! Can't seek to 0x%" PRIX64 " !\n", + pos + newpos); + return 0; +} + +int cache_do_control(stream_t *stream, int cmd, void *arg) +{ + int sleep_count = 0; + int pos_change = 0; + cache_vars_t *s = stream->cache_data; + switch (cmd) { + case STREAM_CTRL_GET_CACHE_SIZE: + *(int64_t *)arg = s->buffer_size; + return STREAM_OK; + case STREAM_CTRL_GET_CACHE_FILL: + *(int64_t *)arg = s->max_filepos - s->read_filepos; + return STREAM_OK; + case STREAM_CTRL_GET_CACHE_IDLE: + *(int *)arg = s->idle; + return STREAM_OK; + case STREAM_CTRL_SEEK_TO_TIME: + s->control_double_arg = *(double *)arg; + s->control = cmd; + pos_change = 1; + break; + case STREAM_CTRL_SEEK_TO_CHAPTER: + case STREAM_CTRL_SET_ANGLE: + s->control_uint_arg = *(unsigned *)arg; + s->control = cmd; + pos_change = 1; + break; + // the core might call these every frame, so cache them... + case STREAM_CTRL_GET_TIME_LENGTH: + *(double *)arg = s->stream_time_length; + return s->stream_time_length ? STREAM_OK : STREAM_UNSUPPORTED; + case STREAM_CTRL_GET_CURRENT_TIME: + *(double *)arg = s->stream_time_pos; + return s->stream_time_pos != + MP_NOPTS_VALUE ? STREAM_OK : STREAM_UNSUPPORTED; + case STREAM_CTRL_GET_START_TIME: + *(double *)arg = s->stream_start_time; + return s->stream_start_time != + MP_NOPTS_VALUE ? STREAM_OK : STREAM_UNSUPPORTED; + case STREAM_CTRL_GET_CHAPTER_TIME: + s->control_double_arg = *(double *)arg; + s->control = cmd; + break; + case STREAM_CTRL_GET_LANG: + s->control_lang_arg = *(struct stream_lang_req *)arg; + case STREAM_CTRL_GET_NUM_TITLES: + case STREAM_CTRL_GET_NUM_CHAPTERS: + case STREAM_CTRL_GET_CURRENT_TITLE: + case STREAM_CTRL_GET_CURRENT_CHAPTER: + case STREAM_CTRL_GET_ASPECT_RATIO: + case STREAM_CTRL_GET_NUM_ANGLES: + case STREAM_CTRL_GET_ANGLE: + case STREAM_CTRL_GET_SIZE: + case STREAM_CTRL_MANAGES_TIMELINE: + case -2: + s->control = cmd; + break; + default: + return STREAM_UNSUPPORTED; + } + cache_wakeup(stream); + while (s->control != -1) { + if (sleep_count++ == 1000) + mp_msg(MSGT_CACHE, MSGL_WARN, + "Cache not responding! [performance issue]\n"); + if (stream_check_interrupt(CONTROL_SLEEP_TIME)) { + s->eof = 1; + return STREAM_UNSUPPORTED; + } + } + if (s->control_res != STREAM_OK) + return s->control_res; + // We cannot do this on failure, since this would cause the + // stream position to jump when e.g. STREAM_CTRL_SEEK_TO_TIME + // is unsupported - but in that case we need the old value + // to do the fallback seek. + // This unfortunately can lead to slightly different behaviour + // with and without cache if the protocol changes pos even + // when an error happened. + if (pos_change) { + stream->pos = s->read_filepos; + stream->eof = s->eof; + } + switch (cmd) { + case STREAM_CTRL_GET_TIME_LENGTH: + case STREAM_CTRL_GET_CURRENT_TIME: + case STREAM_CTRL_GET_ASPECT_RATIO: + case STREAM_CTRL_GET_START_TIME: + case STREAM_CTRL_GET_CHAPTER_TIME: + *(double *)arg = s->control_double_arg; + break; + case STREAM_CTRL_GET_NUM_TITLES: + case STREAM_CTRL_GET_NUM_CHAPTERS: + case STREAM_CTRL_GET_CURRENT_TITLE: + case STREAM_CTRL_GET_CURRENT_CHAPTER: + case STREAM_CTRL_GET_NUM_ANGLES: + case STREAM_CTRL_GET_ANGLE: + *(unsigned *)arg = s->control_uint_arg; + break; + case STREAM_CTRL_GET_SIZE: + *(uint64_t *)arg = s->control_uint_arg; + break; + case STREAM_CTRL_GET_LANG: + *(struct stream_lang_req *)arg = s->control_lang_arg; + break; + case STREAM_CTRL_MANAGES_TIMELINE: + break; + } + return s->control_res; +} -- cgit v1.2.3