video_decompress.cpp

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#ifdef HAVE_CONFIG_H
#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
#endif // HAVE_CONFIG_H
 
#include <stdio.h>
#include <string.h>
#include <string>
#include "debug.h"
#include "video_codec.h"
#include "video_decompress.h"
#include "lib_common.h"
 
#define DECOMPRESS_MAGIC 0xdff34f21u
 
using std::string;
 
struct state_decompress {
        uint32_t magic;             
        const struct video_decompress_info *functions; 
        void *state;                
};
 
ADD_TO_PARAM("decompress", "* decompress=<name>[:<codec>]\n"
                "  Forces specified decompress module (will fail if not able to decompress\n"
                "   the received compression). Optionally also force codec to decode to."
                "   See 'uv --list-modules' to see available decompress modules.\n");
static int find_best_decompress(codec_t compression, struct pixfmt_desc internal_prop, codec_t out_pixfmt,
                int prio_min, int prio_max, const struct video_decompress_info **vdi, string & name) {
        auto decomps = get_libraries_for_class(LIBRARY_CLASS_VIDEO_DECOMPRESS, VIDEO_DECOMPRESS_ABI_VERSION);
 
        int best_priority = prio_max + 1;
        string force_module;
 
        if (commandline_params.find("decompress") != commandline_params.end()) {
                char *tmp = strdup(commandline_params.at("decompress").c_str());
                if (strchr(tmp, ':')) {
                        // if out_pixfmt specified and doesn't match, return
                        if (out_pixfmt != get_codec_from_name(strchr(tmp, ':') + 1)) {
                                free(tmp);
                                return -1;
                        }
                        *strchr(tmp, ':') = '\0';
                }
                force_module = tmp;
                free(tmp);
        }
 
        for (const auto & d : decomps) {
                // if user has explicitly requested decoder, skip all others
                if (!force_module.empty() && d.first != force_module) {
                        continue;
                }
                // first pass - find the one with best priority (least)
                int priority = static_cast<const video_decompress_info *>(d.second)->get_decompress_priority(compression, internal_prop, out_pixfmt);
                if (priority < 0) { // decoder not valid for given properties combination
                        continue;
                }
                if (priority <= prio_max && priority >= prio_min && priority < best_priority) {
                        best_priority = priority;
                        *vdi = static_cast<const video_decompress_info *>(d.second);
                        name = d.first;
                }
        }
 
        if(best_priority == prio_max + 1)
                return -1;
        return best_priority;
}
 
static struct state_decompress *decompress_init(const video_decompress_info *vdi)
{
        struct state_decompress *s;
 
        s = (struct state_decompress *) calloc(1, sizeof(struct state_decompress));
        s->magic = DECOMPRESS_MAGIC;
        s->functions = vdi;
        s->state = s->functions->init();
        if (s->state == NULL) {
                free(s);
                return NULL;
        }
        return s;
}
 
static bool try_initialize_decompress(const video_decompress_info *vdi,
                struct state_decompress **decompress_state, int substreams)
{
        for(int i = 0; i < substreams; ++i) {
                decompress_state[i] = decompress_init(vdi);
 
                if (!decompress_state[i]) {
                        for(int j = 0; j < i; ++j) {
                                if (decompress_state[j] != nullptr) {
                                        decompress_done(decompress_state[j]);
                                }
                                decompress_state[j] = nullptr;
                        }
                        return false;
                }
        }
 
        return true;
}
 
bool decompress_init_multi(codec_t compression, struct pixfmt_desc internal_prop, codec_t out_codec, struct state_decompress **out, int count)
{
        int prio_max = 1000;
        int prio_min = 0;
        int prio_cur;
        const video_decompress_info *vdi = nullptr;
 
        while(1) {
                string name;
                prio_cur = find_best_decompress(compression, internal_prop, out_codec,
                                prio_min, prio_max, &vdi, name);
                // if found, init decoder
                if(prio_cur != -1) {
                        if (try_initialize_decompress(vdi, out, count)) {
                                LOG(LOG_LEVEL_VERBOSE) << "Decompressor \"" << name << "\" initialized successfully.\n";
                                return true;
                        } else {
                                // failed, try to find another one
                                LOG(LOG_LEVEL_VERBOSE) << "Cannot initialize decompressor \"" << name << "\"!\n";
                                prio_min = prio_cur + 1;
                                continue;
                        }
                } else {
                        break;
                }
        }
        return false;
}
 
int decompress_reconfigure(struct state_decompress *s, struct video_desc desc, int rshift, int gshift, int bshift, int pitch, codec_t out_codec)
{
        assert(s->magic == DECOMPRESS_MAGIC);
 
        return s->functions->reconfigure(s->state, desc, rshift, gshift, bshift, pitch, out_codec);
}
 
decompress_status decompress_frame(
                struct state_decompress *s,
                unsigned char *dst,
                unsigned char *compressed,
                unsigned int compressed_len,
                int frame_seq,
                struct video_frame_callbacks *callbacks,
                struct pixfmt_desc *internal_prop)
{
        assert(s->magic == DECOMPRESS_MAGIC);
 
        return s->functions->decompress(s->state,
                        dst,
                        compressed,
                        compressed_len,
                        frame_seq,
                        callbacks,
                        internal_prop);
}
 
int decompress_get_property(struct state_decompress *s, int property, void *val, size_t *len)
{
        return s->functions->get_property(s->state, property, val, len);
}
 
void decompress_done(struct state_decompress *s)
{
        assert(s->magic == DECOMPRESS_MAGIC);
 
        s->functions->done(s->state);
        free(s);
}