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#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include "kitchensink/kitsource.h"
#include "kitchensink/kiterror.h"
#include "kitchensink/internal/utils/kitlog.h"
#define AVIO_BUF_SIZE 32768
static int _ScanSource(AVFormatContext *format_ctx) {
av_opt_set_int(format_ctx, "probesize", INT_MAX, 0);
av_opt_set_int(format_ctx, "analyzeduration", INT_MAX, 0);
if(avformat_find_stream_info(format_ctx, NULL) < 0) {
Kit_SetError("Unable to fetch source information");
return 1;
}
return 0;
}
Kit_Source* Kit_CreateSourceFromUrl(const char *url) {
assert(url != NULL);
Kit_Source *src = calloc(1, sizeof(Kit_Source));
if(src == NULL) {
Kit_SetError("Unable to allocate source");
return NULL;
}
// Attempt to open source
if(avformat_open_input((AVFormatContext **)&src->format_ctx, url, NULL, NULL) < 0) {
Kit_SetError("Unable to open source Url");
goto exit_0;
}
// Scan source information (may seek forwards)
if(_ScanSource(src->format_ctx)) {
goto exit_1;
}
return src;
exit_1:
avformat_close_input((AVFormatContext **)&src->format_ctx);
exit_0:
free(src);
return NULL;
}
Kit_Source* Kit_CreateSourceFromCustom(Kit_ReadCallback read_cb, Kit_SeekCallback seek_cb, void *userdata) {
assert(read_cb != NULL);
Kit_Source *src = calloc(1, sizeof(Kit_Source));
if(src == NULL) {
Kit_SetError("Unable to allocate source");
return NULL;
}
uint8_t *avio_buf = av_malloc(AVIO_BUF_SIZE);
if(avio_buf == NULL) {
Kit_SetError("Unable to allocate avio buffer");
goto exit_0;
}
AVFormatContext *format_ctx = avformat_alloc_context();
if(format_ctx == NULL) {
Kit_SetError("Unable to allocate format context");
goto exit_1;
}
AVIOContext *avio_ctx = avio_alloc_context(
avio_buf, AVIO_BUF_SIZE, 0, userdata, read_cb, 0, seek_cb);
if(avio_ctx == NULL) {
Kit_SetError("Unable to allocate avio context");
goto exit_2;
}
// Set the format as AVIO format
format_ctx->pb = avio_ctx;
// Attempt to open source
if(avformat_open_input(&format_ctx, "", NULL, NULL) < 0) {
Kit_SetError("Unable to open custom source");
goto exit_3;
}
// Scan source information (may seek forwards)
if(_ScanSource(format_ctx)) {
goto exit_4;
}
// Set internals
src->format_ctx = format_ctx;
src->avio_ctx = avio_ctx;
return src;
exit_4:
avformat_close_input(&format_ctx);
exit_3:
av_freep(&avio_ctx);
exit_2:
avformat_free_context(format_ctx);
exit_1:
av_freep(&avio_buf);
exit_0:
free(src);
return NULL;
}
static int _RWReadCallback(void *userdata, uint8_t *buf, int size) {
return SDL_RWread((SDL_RWops*)userdata, buf, 1, size);
}
static int64_t _RWGetSize(SDL_RWops *rw_ops) {
int64_t current_pos;
int64_t max_pos;
// First, see if tell works at all, and fail with -1 if it doesn't.
current_pos = SDL_RWtell(rw_ops);
if(current_pos < 0) {
return -1;
}
// Seek to end, get pos (this is the size), then return.
if(SDL_RWseek(rw_ops, 0, RW_SEEK_END) < 0) {
return -1; // Seek failed, never mind then
}
max_pos = SDL_RWtell(rw_ops);
SDL_RWseek(rw_ops, current_pos, RW_SEEK_SET);
return max_pos;
}
static int64_t _RWSeekCallback(void *userdata, int64_t offset, int whence) {
int rw_whence = 0;
if(whence & AVSEEK_SIZE)
return _RWGetSize(userdata);
if((whence & ~AVSEEK_FORCE) == SEEK_CUR)
rw_whence = RW_SEEK_CUR;
else if((whence & ~AVSEEK_FORCE) == SEEK_SET)
rw_whence = RW_SEEK_SET;
else if((whence & ~AVSEEK_FORCE) == SEEK_END)
rw_whence = RW_SEEK_END;
return SDL_RWseek((SDL_RWops*)userdata, offset, rw_whence);
}
Kit_Source* Kit_CreateSourceFromRW(SDL_RWops *rw_ops) {
return Kit_CreateSourceFromCustom(_RWReadCallback, _RWSeekCallback, rw_ops);
}
void Kit_CloseSource(Kit_Source *src) {
assert(src != NULL);
AVFormatContext *format_ctx = src->format_ctx;
AVIOContext *avio_ctx = src->avio_ctx;
avformat_close_input(&format_ctx);
if(avio_ctx) {
av_freep(&avio_ctx->buffer);
av_freep(&avio_ctx);
}
free(src);
}
int Kit_GetSourceStreamInfo(const Kit_Source *src, Kit_SourceStreamInfo *info, int index) {
assert(src != NULL);
assert(info != NULL);
AVFormatContext *format_ctx = (AVFormatContext *)src->format_ctx;
if(index < 0 || index >= format_ctx->nb_streams) {
Kit_SetError("Invalid stream index");
return 1;
}
AVStream *stream = format_ctx->streams[index];
switch(stream->codec->codec_type) {
case AVMEDIA_TYPE_UNKNOWN: info->type = KIT_STREAMTYPE_UNKNOWN; break;
case AVMEDIA_TYPE_DATA: info->type = KIT_STREAMTYPE_DATA; break;
case AVMEDIA_TYPE_VIDEO: info->type = KIT_STREAMTYPE_VIDEO; break;
case AVMEDIA_TYPE_AUDIO: info->type = KIT_STREAMTYPE_AUDIO; break;
case AVMEDIA_TYPE_SUBTITLE: info->type = KIT_STREAMTYPE_SUBTITLE; break;
case AVMEDIA_TYPE_ATTACHMENT: info->type = KIT_STREAMTYPE_ATTACHMENT; break;
default:
Kit_SetError("Unknown native stream type");
return 1;
}
info->index = index;
return 0;
}
int Kit_GetBestSourceStream(const Kit_Source *src, const Kit_StreamType type) {
assert(src != NULL);
int avmedia_type = 0;
switch(type) {
case KIT_STREAMTYPE_VIDEO: avmedia_type = AVMEDIA_TYPE_VIDEO; break;
case KIT_STREAMTYPE_AUDIO: avmedia_type = AVMEDIA_TYPE_AUDIO; break;
case KIT_STREAMTYPE_SUBTITLE: avmedia_type = AVMEDIA_TYPE_SUBTITLE; break;
default: return -1;
}
int ret = av_find_best_stream((AVFormatContext *)src->format_ctx, avmedia_type, -1, -1, NULL, 0);
if(ret == AVERROR_STREAM_NOT_FOUND) {
return -1;
}
if(ret == AVERROR_DECODER_NOT_FOUND) {
Kit_SetError("Unable to find a decoder for the stream");
return 1;
}
return ret;
}
int Kit_GetSourceStreamCount(const Kit_Source *src) {
assert(src != NULL);
return ((AVFormatContext *)src->format_ctx)->nb_streams;
}
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